Resonant switching power conversion circuit

Abstract

A resonant switching power conversion circuit includes a switching converter, a control circuit and a pre-charge circuit. The control circuit is configured to control a first switch of a plurality of switches of the switching converter in a pre-charge mode to control an electrical connection relationship between a first power source and a first capacitor of a plurality of capacitors of the switching converter, and to control other switches to control the pre-charge circuit to charge a voltage drop of at least one capacitor to a preset voltage when the voltage drop is lower than the preset voltage. In a start-up mode, a first operation signal and a second operation signal are configured to operate the plurality of switches to switch the electrical connection relationship of the corresponding capacitors, so that the switching converter operates in the start-up mode after the pre-charge mode ends. In the start-up mode, the first operation signal and the second operation signal are switched to a conductive level for a plurality of conductive periods, and the time length of the plurality of conductive periods gradually increases.

Description

TECHNICAL FIELD

[0001] The present application relates to a resonant switching power conversion circuit, in particular to a resonant switching power conversion circuit capable of pre-charging. BACKGROUND

[0002] Figure 1 A known power converter 10 is shown. The known power converter 10 includes a front-end DC-DC converter 101 for start-up control, which has two switches Qfl and Qf2, an inductor Lf, a capacitor Cf and a step-down controller 1011. In steady state operation, the front-end DC-DC converter 101 generates additional power loss and heat, so the overall efficiency is reduced.

[0003] In view of the above, the present application is proposed to overcome the deficiencies of the prior art, and provides an innovative resonant switching power conversion circuit. SUMMARY

[0004] In one aspect, the present application provides a resonant switching power conversion circuit for converting a first power source to a second power source or converting the second power source to the first power source, the resonant switching power conversion circuit comprising: at least one switching converter; a control circuit for controlling the switching converter; and a pre-charge circuit coupled between the control circuit and the at least one switching converter; wherein the switching converter comprises: a plurality of capacitors; a plurality of switches coupled to the plurality of capacitors and controlled by the control circuit for switching electrical connection of the corresponding capacitors; at least one first inductor in series with at least one of the plurality of capacitors; and at least one second inductor in series with at least one of the plurality of capacitors; wherein the control circuit is coupled to the first power source, the second power source and the plurality of switches, the control circuit for controlling a first switch of the plurality of switches to control electrical connection of the first power source and a first capacitor of the plurality of capacitors when the switching converter operates in a pre-charge mode, and controlling other switches of the plurality of switches to control the pre-charge circuit to charge at least one of the plurality of capacitors to a preset voltage when a voltage drop of the at least one of the plurality of capacitors is lower than the preset voltage; wherein the first switch is electrically connected between the first power source and the first capacitor; wherein in a start-up mode, a first operation signal and at least one second operation signal are respectively used to correspondingly operate the plurality of switches to switch electrical connection of the corresponding capacitors of the plurality of switches, so that the resonant switching power conversion circuit operates in the start-up mode after the pre-charge mode ends; wherein in the start-up mode, the first operation signal and the at least one second operation signal are respectively switched to an on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, wherein the plurality of on periods gradually increase in length; wherein in a resonant voltage conversion mode, the first operation signal and the at least one second operation signal are respectively used to correspondingly operate the plurality of switches to switch electrical connection of the corresponding capacitors of the plurality of switches, so that the resonant switching power conversion circuit operates in the resonant voltage conversion mode to convert the first power source to the second power source or convert the second power source to the first power source after the start-up mode ends; wherein in the resonant voltage conversion mode, the first operation signal and the at least one second operation signal are respectively switched to the on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, so that a first procedure and at least one second procedure of the resonant voltage conversion mode do not overlap with each other; wherein in the first procedure, the switching of the plurality of switches is controlled by the first operation signal to form a first current path by connecting the plurality of capacitors and the at least one first inductor in series between the first power source and the second power source;In the at least one second procedure, the switching of the plurality of switches is controlled by the at least one second operation signal to cause each of the plurality of capacitors to be connected in series with a corresponding one of the plurality of inductors between the second power source and a ground potential, while forming or alternately forming a plurality of second current paths.

[0005] In one embodiment, in the first procedure, the switching of the plurality of switches is controlled by the first operation signal to cause at least one of the plurality of capacitors to be connected in parallel with the second power source, and in the at least one second procedure, the switching of the plurality of switches is controlled by the at least one second operation signal to cause at least one of the plurality of capacitors to be connected in parallel with the second power source, wherein the capacitors connected in parallel with the second power source in the first procedure are different from the capacitors connected in parallel with the second power source in the second procedure.

[0006] In one embodiment, the plurality of capacitors comprises the first capacitor, a second capacitor, and a third capacitor coupled to each other, wherein in the first procedure, the plurality of switches controls the first capacitor and the third capacitor to be connected in series between the first power source and the second power source, and controls the second capacitor to be connected in parallel with the second power source, and wherein in the second procedure, the plurality of switches controls the second capacitor and the first capacitor to be connected in series between the second power source and the ground potential, and controls the third capacitor to be connected in parallel with the second power source.

[0007] In one embodiment, the plurality of switches comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch, wherein in the first procedure, the first switch, the second switch, and the third switch are turned on to control the first capacitor and the third capacitor to be connected in series between the first power source and the second power source, the fourth switch and the fifth switch are turned on to control the second capacitor to be connected in parallel with the second power source, and the sixth switch to the tenth switch are turned off, and wherein in the second procedure, the sixth switch, the seventh switch, and the eighth switch are turned on to control the second capacitor and the first capacitor to be connected in series between the second power source and the ground potential, and the ninth switch and the tenth switch are turned on to control the third capacitor to be connected in parallel with the second power source.

[0008] In one embodiment, the plurality of capacitors further comprises an output capacitor coupled with the first capacitor, the second capacitor, and the third capacitor, the predetermined voltage comprises a first predetermined voltage and a second predetermined voltage, and in the pre-charge mode, the control circuit performs at least one of: (1) turning on the fourth switch, the fifth switch, the seventh switch, the ninth switch, and the tenth switch, and controlling the pre-charge circuit to charge the voltage drop of the output capacitor, the third capacitor, and the second capacitor to the first predetermined voltage; (2) turning on the second switch and the tenth switch, and controlling the pre-charge circuit to charge the voltage drop of the third capacitor to the first predetermined voltage; (3) turning on the fifth switch, the seventh switch, and the eighth switch, and controlling the pre-charge circuit to charge the voltage drop of the second capacitor and the first capacitor to the first predetermined voltage; or (4) turning on the eighth switch, and controlling the pre-charge circuit to charge the voltage drop of the first capacitor to the second predetermined voltage.

[0009] In one embodiment, the first predetermined voltage is a target voltage of a second voltage of the second power supply, and the second predetermined voltage is twice the target voltage of the second voltage of the second power supply.

[0010] In one embodiment, the resonant switching power conversion circuit further comprises one of: (1) wherein the third capacitor is also directly in series with the first inductor to form a first resonant tank, and the second capacitor is also directly in series with the second inductor to form a second resonant tank; wherein in the first procedure, the plurality of switches further control the first resonant tank and the first capacitor to be in series between the first power source and the second power source, and further control the second resonant tank and the second power source to be in parallel; wherein in the second procedure, the plurality of switches further control the second resonant tank and the first capacitor to be in series between the second power source and the ground potential, and further control the first resonant tank and the second power source to be in parallel; (2) the first inductor and the second inductor are a single same inductor coupled between the second power source and a switching node; wherein in the first procedure, the plurality of switches further control the first capacitor and the third capacitor to be in series through the switching node and the inductor before being in series between the first power source and the second power source, and further control the second capacitor to be in parallel with the second power source through the switching node and the inductor; wherein in the second procedure, the plurality of switches further control the second capacitor and the first capacitor to be in series through the switching node and the inductor before being in series between the second power source and the ground potential, and further control the third capacitor to be in parallel with the second power source through the switching node and the inductor; or (3) wherein the first inductor is coupled between the second power source and a first switching node, and the second inductor is coupled between the second power source and a second switching node; wherein in the first procedure, the plurality of switches further control the first capacitor and the third capacitor to be in series through the first switching node and the first inductor before being in series between the first power source and the second power source, and further control the second capacitor to be in parallel with the second power source through the second switching node and the second inductor; wherein in the second procedure, the plurality of switches further control the second capacitor and the first capacitor to be in series through the second switching node and the second inductor before being in series between the second power source and the ground potential, and further control the third capacitor to be in parallel with the second power source through the first switching node and the first inductor.

[0011] In one embodiment, the at least one switching converter comprises first and second switching converters coupled in parallel between the first and second power sources, and the first and second switching converters switch the corresponding plurality of switches in each switching converter in opposite phases to each other.

[0012] In one embodiment, the resonant switching power conversion circuit has feature (3), and the first and second inductors are both operated in continuous conduction mode.

[0013] In an embodiment, the resonant switching power conversion circuit further comprises an upper layer capacitor and a plurality of upper layer switches, wherein the at least one switching converter comprises a first switching converter and a second switching converter; wherein the upper layer capacitor, the plurality of upper layer switches, the first switching converter and the second switching converter are coupled to each other in a basic topology; wherein in the first procedure, the plurality of upper layer switches control the first switching converter and the upper layer capacitor to be connected in series between the first power source and the second power source, and control the second switching converter to be connected in parallel with the second power source; wherein in the second procedure, the plurality of upper layer switches control the second switching converter and the upper layer capacitor to be connected in series between the second power source and the ground potential, and control the first switching converter to be connected in parallel with the second power source.

[0014] In an embodiment, a ratio of the first voltage of the first power source to the second voltage of the second power source is 8.

[0015] In an embodiment, the resonant switching power conversion circuit further comprises a further upper layer capacitor, a plurality of further upper layer switches, a first switching converter of the further upper layer and a second switching converter of the further upper layer, wherein the further upper layer capacitor, the plurality of further upper layer switches, the first switching converter of the further upper layer and the second switching converter of the further upper layer are coupled to each other in a recursive expansion manner corresponding to the basic topology; wherein the first switching converter of the further upper layer and the second switching converter of the further upper layer recursively correspond to the resonant switching power conversion circuit of a next layer.

[0016] In an embodiment, the at least one first inductor is a plurality of charging inductors, and the plurality of capacitors are respectively connected in series with the plurality of charging inductors, wherein the at least one second inductor is a plurality of discharging inductors, and in the first procedure, the plurality of capacitors and the plurality of charging inductors are connected in series with each other between the first power source and the second power source by switching of the plurality of switches to form the first current path; wherein in the second procedure, the plurality of charging inductors are used as the plurality of discharging inductors, and the plurality of discharging inductors and the plurality of capacitors are respectively connected in series with each other between the second power source and the ground potential by switching of the plurality of switches to form a plurality of second current paths, wherein the plurality of second current paths are connected in parallel with each other.

[0017] In an embodiment, the at least one first inductor and the at least one second inductor have coupled inductance with each other.

[0018] In an embodiment, the at least one first inductor and the at least one second inductor having coupled inductance with each other are configured as coupled inductors, or are configured as a transformer.

[0019] In one embodiment, the at least one first inductor is a single first inductor and the at least one second inductor is a single second inductor.

[0020] In one embodiment, the single first inductor has an inductance value equal to an inductance value of the single second inductor.

[0021] In one embodiment, the at least one first inductor and the at least one second inductor are a single same inductor.

[0022] In one embodiment, the first program has a first resonant frequency and the second program has a second resonant frequency, and the first resonant frequency is the same as the second resonant frequency.

[0023] In one embodiment, the first program has a first resonant frequency and the second program has a second resonant frequency, and the first resonant frequency is different from the second resonant frequency.

[0024] In one embodiment, a voltage conversion ratio of a first voltage of the first power supply to a second voltage of the second power supply of the switching converter is 4:1, 3:1, or 2:1.

[0025] In one embodiment, a voltage conversion ratio of a first voltage of the first power supply to a second voltage of the second power supply of the switching converter is 4:1.

[0026] In one embodiment, a ratio of a voltage across the first capacitor to the second voltage is 2, a ratio of a voltage across the third capacitor to the second voltage is 1, and a ratio of a voltage across the second capacitor to the second voltage is 1 at a steady state.

[0027] In one embodiment, the first inductor and the second inductor are a single same inductor, in a 2 times conversion mode, a portion of the plurality of switches are constantly on, another portion of the plurality of switches are constantly off, and another portion of the plurality of switches are used to switch one of the second capacitor or the first capacitor, to make the capacitor and the inductor in series between the first power supply and the second power supply in the first program, and make the capacitor and the inductor in series and in parallel to the second power supply in the second program, so that a ratio of a first voltage of the first power supply to a second voltage of the second power supply is 2, wherein the inductor and the capacitor operate in a resonant manner to achieve power conversion between the first power supply and the second power supply.

[0028] In one embodiment, in a 2x conversion mode, part of the plurality of switches are constantly on, another part of the plurality of switches are constantly off, and another part of the plurality of switches are used to switch the first capacitor, so as to make the first capacitor and the first inductor in series between the first power supply and the second power supply in the first procedure, and make the first capacitor and the second inductor in series and then in parallel to the second power supply in the second procedure, so that the ratio of the first voltage of the first power supply to the second voltage of the second power supply is 2, wherein the first inductor and the second inductor operate in a resonant manner with the first capacitor to achieve power conversion between the first power supply and the second power supply.

[0029] In one embodiment, the first inductor and the second inductor are a single same inductor, in a 3x conversion mode, part of the plurality of switches are constantly on, another part of the plurality of switches are constantly off, and another part of the plurality of switches are used to switch the first capacitor and the third capacitor, so as to make the first capacitor, the third capacitor and the inductor in series between the first power supply and the second power supply in the first procedure, and make the first capacitor and the third capacitor in parallel and then in series with the inductor, and then in parallel to the second power supply, so that the ratio of the first voltage of the first power supply to the second voltage of the second power supply is 3, wherein the inductor and the first capacitor, and / or the inductor and the third capacitor, operate in a resonant manner to achieve power conversion between the first power supply and the second power supply.

[0030] In one embodiment, in a 3x conversion mode, part of the plurality of switches are constantly on, another part of the plurality of switches are constantly off, and another part of the plurality of switches are used to switch the first capacitor and the third capacitor, so as to make the first capacitor, the third capacitor and the first inductor in series between the first power supply and the second power supply in the first procedure, and make the first capacitor and the third capacitor in series with the second inductor and the first inductor respectively and then in parallel to the second power supply, so that the ratio of the first voltage of the first power supply to the second voltage of the second power supply is 3, wherein the second inductor and the first capacitor, and / or the first inductor and the third capacitor, operate in a resonant manner to achieve power conversion between the first power supply and the second power supply.

[0031] In one embodiment, the predetermined voltage and the first voltage of the first power supply have a fixed proportional relationship.

[0032] In one embodiment, the first inductor and the second inductor are a single same inductor, and the capacitance value of the first capacitor is much larger than that of the third capacitor and the second capacitor, so that the first resonant frequency of the third capacitor and the inductor, and the second resonant frequency of the second capacitor and the inductor, are both higher than or equal to 10 times of the third resonant frequency of the first capacitor and the inductor.

[0033] In another aspect, the present application provides a resonant switching power conversion circuit for converting a first power source to a second power source or converting the second power source to the first power source, the resonant switching power conversion circuit comprising: at least one resonant tank having a resonant capacitor and a resonant inductor connected in series with each other; a plurality of switches coupled with the at least one resonant tank, in a resonant voltage conversion mode, according to a corresponding first operation signal and a corresponding second operation signal, to switch the corresponding resonant tank to a corresponding first resonant procedure and a corresponding second resonant procedure, wherein in the first resonant procedure, the corresponding resonant tank is charged, and wherein in the second resonant procedure, the corresponding resonant tank is discharged; a control circuit for controlling the plurality of switches; a pre-charge circuit coupled between the control circuit and the plurality of switches except for a first switch; and at least one non-resonant capacitor coupled with the at least one resonant tank, in the resonant voltage conversion mode, the first operation signal and the second operation signal switch the non-resonant capacitor and the at least one resonant tank, and the voltage across the non-resonant capacitor is maintained in a fixed ratio with the first power source; wherein the control circuit is coupled to the first power source, the second power source and the plurality of switches, the control circuit is configured to control the first switch to control the connection between the first power source and the at least one resonant tank, and to control the other switches to control the pre-charge circuit to charge at least one of the resonant capacitor and the at least one non-resonant capacitor to a preset voltage when the voltage of the at least one of the resonant capacitor and the at least one non-resonant capacitor is lower than the preset voltage, when the resonant switching power conversion circuit operates in a pre-charge mode; wherein the first switch is electrically connected between the first power source and the resonant capacitor; wherein in a start-up mode, the first operation signal and the second operation signal are configured to operate the plurality of switches to switch the non-resonant capacitor and the at least one resonant tank, so that the resonant switching power conversion circuit operates in the start-up mode after the pre-charge mode; wherein in the start-up mode, the first operation signal and the second operation signal are each switched to an on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, wherein the plurality of on periods gradually increase in length; wherein in the resonant voltage conversion mode, the first operation signal and the second operation signal are each switched to an on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, so that the first resonant procedure and the second resonant procedure do not overlap with each other, and the resonant switching power conversion circuit operates in the resonant voltage conversion mode after the start-up mode, the first resonant procedure and the second resonant procedure are repeatedly interleaved to convert the first power source to the second power source or convert the second power source to the first power source.

[0034] In one embodiment, the preset voltage is a target voltage of the second voltage of the second power supply.

[0035] In one embodiment, the preset voltage is a positive integer multiple of a target voltage of the second voltage of the second power supply.

[0036] In one embodiment, the pre-charge circuit includes a current source for generating a pre-charge current, and a pre-charge switch circuit coupled between the current source and the plurality of switches other than the first switch, wherein in the pre-charge mode, the control circuit controls the pre-charge switch circuit and the plurality of switches other than the first switch to control the electrical connection relationship between the current source and the at least one of the resonant capacitor and the at least one non-resonant capacitor, thereby charging the at least one of the resonant capacitor and the at least one non-resonant capacitor to the preset voltage according to the pre-charge current.

[0037] In one embodiment, the control circuit includes a duty cycle decision circuit for comparing a ramp-up voltage of a ramp-up node with a periodic waveform signal to generate a duty cycle signal, a duty cycle distribution circuit for generating the first operation signal and the second operation signal according to the duty cycle signal, respectively, and a ramp-up voltage generation circuit coupled with the duty cycle decision circuit for generating the ramp-up voltage of the ramp-up node in the start-up mode, wherein the ramp-up voltage of the ramp-up node gradually increases in the start-up mode, so that the duty cycles of the first operation signal and the at least one second operation signal gradually increase correspondingly.

[0038] In one embodiment, in the pre-charge mode, the control circuit controls the conduction degree of the first switch, so that a pre-charge current flows from the first power supply to the at least one of the resonant capacitor and the at least one non-resonant capacitor via the first switch, to charge the at least one of the resonant capacitor and the at least one non-resonant capacitor to the preset voltage.

[0039] In one embodiment, the preset voltage and the first voltage of the first power supply have a fixed proportional relationship.

[0040] In one embodiment, at least one of the resonance capacitors includes a first resonance capacitor and a second resonance capacitor, the preset voltages include a first preset voltage, a second preset voltage, and a third preset voltage, the switches include a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch, and in the pre-charge mode, the control circuit performs at least one of: (1) turning on the sixth switch and controlling the pre-charge circuit to charge a voltage drop of the first resonance capacitor to the first preset voltage; (2) turning on the second switch and the eighth switch and controlling the pre-charge circuit to charge a voltage drop of the non-resonance capacitor to the second preset voltage; or (3) turning on the second switch, the third switch, and the tenth switch and controlling the pre-charge circuit to charge a voltage drop of the second resonance capacitor to the third preset voltage.

[0041] In one embodiment, the first preset voltage is three times a target voltage of a second voltage of the second power supply, the second preset voltage is two times the target voltage of the second voltage, and the third preset voltage is the target voltage of the second voltage.

[0042] The present application has the advantages of achieving the pre-charge operation mode and the hot plug-in function by using existing switches, achieving the start-up operation by using existing power stage elements, not needing an additional front-end DC-DC converter for start-up control, using fewer elements and saving space, improving power conversion efficiency without the power loss of the front-end DC-DC converter, reducing inrush current, supporting soft-start, and supporting parallel operation for a multi-phase resonant switching capacitor converter (RSCC).

[0043] The objects, technical contents, characteristics and effects of the present application will be more apparent from the following detailed description of specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a schematic diagram of a known power converter.

[0045] Figure 2 is a circuit schematic diagram of a resonant switching power conversion circuit according to one embodiment of the present application.

[0046] Figure 3 is a circuit schematic diagram of a controller in a resonant switching power conversion circuit according to one embodiment of the present application.

[0047] Figure 4 is a circuit schematic diagram of a control circuit in a resonant switching power conversion circuit according to one embodiment of the present application.

[0048] Figure 5Ais a signal waveform diagram showing related signals in a startup mode of a control circuit of a resonant switching power conversion circuit according to an embodiment of the present application.

[0049] Figure 5B is a signal waveform diagram showing related signals in a startup mode of a resonant switching power conversion circuit according to an embodiment of the present application.

[0050] Figure 6 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0051] Figure 7 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0052] Figure 8 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0053] Figure 9 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0054] Figure 10 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0055] Figure 11 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0056] Figure 12 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0057] Figure 13 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0058] Figure 14 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0059] Figure 15 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0060] Figure 16 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0061] Figure 17 is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present application.

[0062] Figure 18A is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application.

[0063] Figure 18B is a circuit block diagram showing a resonant switching power conversion circuit according to an embodiment of the present application.

[0064] Figure 19 is a circuit schematic diagram showing a resonant switching power conversion circuit according to still another embodiment of the present application.

[0065] Figure 20 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application.

[0066] Figure 21 is a circuit schematic diagram showing a resonant switching power conversion circuit according to still another embodiment of the present application.

[0067] Figure 22 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application.

[0068] Figure 23 is a circuit schematic diagram showing a resonant switching power conversion circuit according to still another embodiment of the present application.

[0069] Figure 24 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application.

[0070] Figure 25 is a circuit schematic diagram showing a resonant switching power conversion circuit according to still another embodiment of the present application.

[0071] Legend of Symbols

[0072] 10: Known power converter

[0073] 100b: Pipeline resonant switching power conversion circuit

[0074] 101: Front-end DC-DC converter

[0075] 1011: Buck controller

[0076] 20, 20a, 20b, 30, 30a, 40, 40a, 40b, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170: Resonant switching power conversion circuit

[0077] 201, 201a, 201b, 301, 301a, 401, 401a, 401b, 501, 601, 701, 801, 901, 1001, 1101, 1201, 1301, 1401, 1501, 1601, 1701: controller

[0078] 2011: control circuit

[0079] 20111: duty ratio decision circuit

[0080] 20112: duty ratio distribution circuit

[0081] 20113: ramp voltage generation circuit

[0082] 2012: precharge circuit

[0083] 202, 202a, 202b, 302, 302a, 402, 402a, 402b, 502, 1502, 1602, 1702: switching converter

[0084] 1402, 1403, 3021, 3021a, 3022, 3022a, 6021, 6022, 6031, 6032, 10021, 10022, 10031, 10032: resonance tank

[0085] 5021: transformer

[0086] 602, 702, 802, 902, 1002, 1002b, 1102, 1202, 1302: first switching converter

[0087] 603, 703, 803, 903, 1003, 1003b, 1103, 1203, 1303: second switching converter

[0088] C1 to C3, C11 to C13, C21, Ca, Cf, CV1, CV2: capacitor

[0089] CLK: clock signal

[0090] CS1, CS2: current source

[0091] GA: first operation signal

[0092] GB: second operation signal

[0093] Gpr0, Gpr1, Gpr1', Gpr2, Gpr3: precharge operation signal

[0094] I1: first current

[0095] I2: second current

[0096] IL1: Inductor L1 current

[0097] IL2: Inductor L2 current

[0098] Ipr: Pre-charge current

[0099] L, L1, L11, L12, L2, L3, Lf: (resonant) inductor

[0100] Lgc-H: Signal

[0101] LX: Switching node

[0102] LX1, LX11: First switching node

[0103] LX2, LX12: Second switching node

[0104] Q1-Q21, Q28, Qf1, Qf2: Switch

[0105] S1: Pre-charge switch circuit

[0106] S2: Reset switch

[0107] Srst: Reset signal

[0108] V1: First voltage

[0109] V2: Second voltage

[0110] Va: Ramp-up voltage of ramp-up node

[0111] VC1: Capacitor C1 cross voltage

[0112] VC2: Capacitor C2 cross voltage

[0113] VC3: Capacitor C3 cross voltage

[0114] Vd: Duty cycle signal

[0115] Vm: Intermediate signal

[0116] Vpr: Second pre-set voltage

[0117] Vramp: Periodic waveform signal

[0118] Vtgt: Target voltage DETAILED DESCRIPTION

[0119] The figures in the present disclosure are all schematic, and mainly aim to represent the coupling relationship between circuits, and the relationship between signal waveforms, and the circuits, signal waveforms and frequencies are not drawn according to the scale.

[0120] Figure 2A schematic diagram of an embodiment of a resonant switching power conversion circuit according to the present application is shown. The resonant switching power conversion circuit 20 is used to convert a first power source (corresponding to a first voltage V1 and a first current I1) to a second power source (corresponding to a second voltage V2 and a second current I2), or vice versa. In this embodiment, the resonant switching power conversion circuit 20 comprises a switching converter 202 including a first capacitor (capacitor C1), a second capacitor (capacitor C2), a third capacitor (capacitor C3), and a plurality of switches Q1-Q10 coupled to each other.

[0121] In a first procedure, the plurality of switches Q1-Q10 controls the first capacitor (capacitor C1) and the third capacitor (capacitor C3) to be connected in series between the first power source and the second power source, and controls the second capacitor (capacitor C2) to be connected in parallel with the second power source, with the other end of the second capacitor (capacitor C2) being controlled to be coupled to a ground potential. Specifically, switches Q1, Q2, and Q3 are turned on to control the first capacitor (capacitor C1) and the third capacitor (capacitor C3) to be connected in series between the first power source and the second power source, switches Q4 and Q5 are turned on to control the second capacitor (capacitor C2) to be connected in parallel with the second power source, and switches Q6-Q10 are turned off. In this embodiment, in the first procedure, the control signal GA is enabled so that the switches controlled thereby are turned on, and the control signal GB is disabled so that the switches controlled thereby are turned off.

[0122] In a second procedure, the plurality of switches Q1-Q10 controls the second capacitor (capacitor C2) and the first capacitor (capacitor C1) to be connected in series between the second power source and the ground potential, and controls the third capacitor (capacitor C3) to be connected in parallel with the second power source. In the second procedure, the second capacitor (capacitor C2) and the first capacitor (capacitor C1) are connected in anti-series between the second power source and the ground potential. Specifically, switches Q6, Q7, and Q8 are turned on to control the second capacitor (capacitor C2) and the first capacitor (capacitor C1) to be connected in series between the second power source and the ground potential, switches Q9 and Q10 are turned on to control the third capacitor (capacitor C3) to be connected in parallel with the second power source, and switches Q1-Q5 are turned off. In this embodiment, in the second procedure, the control signal GA is disabled so that the switches controlled thereby are turned off, and the control signal GB is enabled so that the switches controlled thereby are turned on.

[0123] The resonant switching power conversion circuit 20 performs power conversion between the first power source and the second power source by the periodic operation described above. In this embodiment, the ratio of the first voltage V1 to the second voltage V2 is 4.

[0124] It is noted that, in the second procedure, the second capacitor (capacitor C2) and the first capacitor (capacitor Cl) are connected in series in a reverse direction, meaning that the voltage across the second capacitor (capacitor C2) and the voltage across the first capacitor (capacitor Cl) are in opposite directions.

[0125] In the embodiment of converting the first power source to the second power source, in the first procedure, the first power source charges the first capacitor (capacitor Cl) and the third capacitor (capacitor C3) connected in series, and the second capacitor (capacitor C2) is discharged to supply the second power source, that is, the second capacitor (capacitor C2) charges the capacitor CV2 coupled to the second power source. In the second procedure, the first capacitor (capacitor Cl) charges the second capacitor (capacitor C2) and the second power source.

[0126] In addition, in the embodiment of converting the second power source to the first power source, in the first procedure, the second power source charges the first capacitor (capacitor Cl) and the third capacitor (capacitor C3) connected in series, and the second power source charges the second capacitor (capacitor C2). In the second procedure, the second power source charges the third capacitor (capacitor C3), and the second power source charges the first capacitor (capacitor Cl) through the second capacitor (capacitor C2).

[0127] In the steady state (that is, the switching converter 202 operates in the resonant voltage conversion mode, which will be described later), the ratio of the voltage across the first capacitor (capacitor Cl) VCl to the second voltage V2 is 2, the ratio of the voltage across the third capacitor (capacitor C3) VC3 to the second voltage V2 is 1, and the ratio of the voltage across the second capacitor (capacitor C2) VC2 to the second voltage V2 is 1, through the periodic operation described above. In the embodiment where the second voltage V2 is 12V, in the steady state, the voltage across the third capacitor (capacitor C3) VC3 and the voltage across the second capacitor (capacitor C2) VC2 are both 12V. It is noted that, since the present application can maintain the voltage across the capacitors at a lower voltage in the steady state, the capacitors can maintain a higher effective capacitance value, so that the required voltage withstand and volume of the capacitors can be effectively reduced, and the resonant frequency is more stable, and has a better transient response. It is also noted that the output current (for example, corresponding to the second current I2) of the present application is provided by two channels, so that the ripple can be reduced.

[0128] The capacitors CV1 and CV2 coupled to the first power source and the second power source respectively, in the embodiment of converting the first power source to the second power source, correspond to the input capacitor and the output capacitor respectively, or in the embodiment of converting the second power source to the first power source, correspond to the output capacitor and the input capacitor respectively.

[0129] The switching converter 202 further comprises an inductor L1 coupled between the second power source and a first switching node LX1, and an inductor L2 coupled between the second power source and a second switching node LX2. In the first mode, the switches Q1-Q10 are controlled to connect the first capacitor (C1) and the third capacitor (C3) in series through the first switching node LX1 and the inductor L1, and then in series between the first power source and the second power source, and to connect the second capacitor (C2) in parallel with the second power source through the second switching node LX2 and the inductor L2. In the second mode, the switches Q1-Q10 are controlled to connect the second capacitor (C2) and the first capacitor (C1) in series through the second switching node LX2 and the inductor L2 between the second power source and the ground, and to connect the third capacitor (C3) in parallel with the second power source through the first switching node LX1 and the inductor L1. In one embodiment, the inductors L1 and L2 are operated in continuous conduction mode, so that the inrush current and the ripple current can be further reduced.

[0130] In one embodiment, the capacitance of the first capacitor C1 is much larger than the capacitances of the second capacitor (C2) and the third capacitor (C3), so that the first resonant frequency of the third capacitor (C3) and the inductor, and the second resonant frequency of the second capacitor (C2) and the inductor, are both much higher than the third resonant frequency of the first capacitor (C1) and the inductor. In a preferred embodiment, the first resonant frequency and the second resonant frequency are both greater than or equal to 10 times the third resonant frequency.

[0131] Figure 3 is a circuit schematic diagram of a controller in a resonant switching power converter according to one embodiment of the present application. Please refer to Figure 2 and Figure 3The resonant switching power conversion circuit 20 further includes a controller 201. The controller 201 includes a control circuit 2011 and a pre-charge circuit 2012. The control circuit 2011 is coupled to the first power source, the second power source, the plurality of switches Q1-Q10, and a node between the first switch (e.g., switch Q1) and the seventh switch (e.g., switch Q7) to control the switching converter 202, and the pre-charge circuit 2012 is coupled between the control circuit 2011 and the switching converter 202. The control circuit 2011 is configured to generate a pre-charge operation signal Gpr1 to control the first switch (e.g., switch Q1) of the plurality of switches Q1-Q10 to control the electrical connection between the first power source and a first capacitor (e.g., capacitor C1) of the plurality of capacitors (capacitors C1-C3) (e.g., to turn off switch Q1 to disconnect the first power source from capacitor C1) and to generate pre-charge operation signals Gpr2 and Gpr3 to control other switches (e.g., switches Q2-Q10) of the plurality of switches Q1-Q10 to control the pre-charge circuit 2012 to charge the voltage of at least one of the plurality of capacitors (capacitors C1-C3) to a pre-set voltage when the voltage of the at least one of the plurality of capacitors (capacitors C1-C3) is lower than the pre-set voltage when the switching converter 202 is operating in a pre-charge mode. The control circuit 2011 is also configured to generate a pre-charge operation signal Gpr0 to control a pre-charge switch circuit S1 to cause a pre-charge current Ipr generated by a current source CS1 to charge capacitor CV2, capacitor C1, capacitor C2, and / or capacitor C3 when the pre-charge operation signals Gpr2 and Gpr3 control the other switches (e.g., switches Q2-Q10) of the plurality of switches Q1-Q10 when the switching converter 202 is operating in the pre-charge mode.

[0132] In one embodiment, the control circuit 2011 generates the pre-charge operation signals Gpr0, Gpr1, Gpr2, and Gpr3 to at least one of: (1) turn on switches Q4, Q5, Q7, Q9, and Q10 and control the pre-charge circuit 2012 to charge the voltages of capacitor CV2, capacitor C3, and capacitor C2 to a first pre-set voltage; (2) turn on switches Q2 and Q10 and control the pre-charge circuit 2012 to charge the voltage of capacitor C3 to the first pre-set voltage; (3) turn on switches Q5, Q7, and Q8 and control the pre-charge circuit 2012 to charge the voltages of capacitor C2 and capacitor C1 to the first pre-set voltage; or (4) turn on switch Q8 and control the pre-charge circuit 2012 to charge the voltage of capacitor C1 to a second pre-set voltage when the switching converter 202 is operating in the pre-charge mode. In one embodiment, the first pre-set voltage is the target voltage of the second voltage V2 and the second pre-set voltage is twice the target voltage of the second voltage V2.

[0133] In another embodiment, during the pre-charge mode, the control circuit 2011 controls the conduction level of the first switch (e.g., switch Q1) to allow a pre-charge current to flow from the first power source through the first switch to at least one of the plurality of capacitors (e.g., capacitors C1-C3) to charge the voltage drop of at least one of the plurality of capacitors (e.g., capacitors C1-C3) to a preset voltage. In one embodiment, the preset voltage is the target voltage of the second voltage V2 of the second power source. In another embodiment, the preset voltage is a positive integer multiple of the target voltage of the second voltage V2 of the second power source, such as but not limited to one time, two times. In this embodiment, the first switch is switch Q1 and the first capacitor is capacitor C1. As shown in FIG. 2, the first switch (switch Q1) is electrically connected between the first power source and the first capacitor (capacitor C1). Figure 2 and Figure 3 As shown in FIG. 2, the first switch (switch Q1) is electrically connected between the first power source and the first capacitor (capacitor C1).

[0134] In the start-up mode, the first operation signal GA and at least one second operation signal GB are respectively used to operate the plurality of switches Q1-Q10 to switch the electrical connection relationship of the capacitors corresponding to the plurality of switches Q1-Q10, so that the resonant switching power conversion circuit 20 operates in the start-up mode after the pre-charge mode ends. In the start-up mode, the first operation signal GA and at least one second operation signal GB are respectively switched to the conduction level for a plurality of conduction periods, and the plurality of conduction periods do not overlap with each other. In one embodiment, the time length of the plurality of conduction periods gradually increases.

[0135] After the start-up mode ends, the resonant voltage conversion mode is entered. In the resonant voltage conversion mode, the first operation signal GA and at least one second operation signal GB are respectively used to operate the plurality of switches Q1-Q10 to switch the electrical connection relationship of the capacitors corresponding to the plurality of switches Q1-Q10, so that the resonant switching power conversion circuit 20 operates in the resonant voltage conversion mode after the start-up mode ends to convert the first power source to the second power source or convert the second power source to the first power source. In one embodiment, the resonant switching power conversion circuit 20 of the present application can perform hot swapping from the entire circuit after the first power source.

[0136] As shown in FIG. 2, the first switch (switch Q1) is electrically connected between the first power source and the first capacitor (capacitor C1). Figure 3As shown, in one embodiment, the pre-charge circuit 2012 includes a current source CS1 and a pre-charge switch circuit S1. The current source CS1 is configured to generate a pre-charge current Ipr, and the pre-charge switch circuit S1 is coupled between the current source CS1 and a plurality of switches (e.g., switches Q2-Q10) except the first switch. In the pre-charge mode, the control circuit 2011 generates a pre-charge operation signal Gpr0 to control the pre-charge switch circuit S1, and generates pre-charge operation signals Gpr2 and Gpr3 to control the plurality of switches (e.g., switches Q2-Q10) except the first switch (switch Q1), and controls the electrical connection between the current source CS1 and the at least one of the plurality of capacitors (capacitors C1-C3), so as to charge the voltage drop of the at least one of the plurality of capacitors (capacitors C1-C3) to the preset voltage according to the pre-charge current Ipr.

[0137] It is noted that, in the pre-charge mode, the control circuit 2011 can generate a pre-charge operation signal Gpr1 to control the conduction degree of the switch Q1, so that the first current I1 is used as the pre-charge current; the control circuit 2011 also generates pre-charge operation signals Gpr2 and Gpr3 to control the plurality of switches (e.g., switches Q2-Q10), so that the first current I1 flows from the first power source to the at least one of the plurality of capacitors (e.g., capacitors C1-C3) via the switch Q1, to charge the voltage drop of the at least one of the plurality of capacitors (e.g., capacitors C1-C3) to the preset voltage, and to control the conduction degree of the switch Q1 when the voltage drop of the at least one of the plurality of capacitors (capacitors C1-C3) is lower than the preset voltage, so as to charge the voltage drop of the at least one of the plurality of capacitors (capacitors C1-C3) to the preset voltage; or, the control circuit 2011 can generate a pre-charge operation signal Gpr0 to turn on the pre-charge switch circuit S1 to generate the pre-charge current Ipr, and the control circuit 2011 also generates pre-charge operation signals Gpr2 and Gpr3 to control the plurality of switches (e.g., switches Q2-Q10), so as to control the pre-charge circuit 2012 to charge the voltage drop of the at least one of the plurality of capacitors (capacitors C1-C3) to the preset voltage when the voltage drop of the at least one of the plurality of capacitors (capacitors C1-C3) is lower than the preset voltage. Of course, the above two pre-charge modes can be alternatively operated or simultaneously operated.

[0138] Figure 4 is a schematic diagram of a control circuit in a resonant switching power conversion circuit according to an embodiment of the present application. The present embodiment shows a more specific exemplary embodiment of the control circuit 2011, but the control circuit 2011 of the present application can also be implemented in other architectures. As shown, the control circuit 2011 includes a pre-charge circuit 2012, a first switch Q1, a plurality of switches Q2-Q10, and a plurality of capacitors C1-C3. Figure 4As shown, in one embodiment, the control circuit 2011 includes a duty cycle decision circuit 20111, a duty cycle distribution circuit 20112, and a ramp-up voltage generation circuit 20113. The duty cycle decision circuit 20111 is configured to compare a ramp-up voltage Va generated at a ramp-up node of the ramp-up voltage generation circuit 20113 between a current source CS2 and a capacitor Ca with a periodic waveform signal Vramp, and generate a duty cycle signal Vd. The periodic waveform signal Vramp is, for example but not limited to, a triangular wave as shown. Figure 5A The duty cycle distribution circuit 20112 is configured to generate a first operation signal GA and at least one second operation signal GB according to the duty cycle signal Vd. In one embodiment, as shown, the duty cycle decision circuit 20111 includes a comparator and a logic AND gate, and the duty cycle distribution circuit 20112 includes a flip-flop and a logic AND gate. The ramp-up voltage generation circuit 20113 includes the current source CS2, the capacitor Ca, and a reset switch S2. Figure 4

[0139] In the start-up mode, the current source CS2 of the ramp-up voltage generation circuit 20113 charges the capacitor Ca, so that the ramp-up voltage Va at the ramp-up node gradually rises. When the duty cycle decision circuit 20111 compares the ramp-up voltage Va with the periodic waveform signal Vramp, the duty cycle of the duty cycle signal Vd gradually rises, and the duty cycle of the first operation signal GA and the at least one second operation signal GB also gradually rises. When the first power source is switched to the second power source or the second power source is switched to the first power source, the inrush current is reduced, and the flexible start-up is supported.

[0140] In one embodiment, when the ramp-up voltage Va rises above the maximum value of the periodic waveform signal Vramp, the first operation signal GA and the at least one second operation signal GB generated by the duty cycle distribution circuit 20112 according to the duty cycle signal Vd can directly enter the resonant voltage conversion mode. Of course, after entering the resonant voltage conversion mode, the duty cycle distribution circuit 20112 can also be turned off, and the first operation signal GA and the at least one second operation signal GB can be generated by other circuits. In addition, the ramp-up voltage generation circuit 20113 can turn on the reset switch S2 according to the reset signal Srst at an appropriate time point (for example, before the next start-up mode starts) to discharge the capacitor Ca, so as to reset the ramp-up voltage Va.

[0141] Figure 5A is a signal waveform diagram showing related signals in the start-up mode of a control circuit of a resonant switching power conversion circuit according to an embodiment of the present application. The ramp-up voltage Va at the ramp-up node, the periodic waveform signal Vramp, the clock signal CLK, the duty cycle signal Vd, the first operation signal GA, and the second operation signal GB are shown in Figure 5A Figure 5A ​​As shown, the voltage Va of the rising node gradually increases during startup. Figure 5A As shown, in the startup mode, the duration of the multiple segment conduction periods t1 to t4 gradually increases. Therefore, in one embodiment, the duty cycle gradually increases from 0 to 50%.

[0142] Figure 5B This is a schematic diagram of signal waveforms showing relevant signals in the startup mode of a resonant switching power conversion circuit according to an embodiment of the present invention. The second voltage V2, the second current I2, the voltage across capacitor C1 VC1, the voltage across capacitor C2 VC2, the voltage across capacitor C3 VC3, and the current IL1 of inductor L1 are shown in... Figure 5B . Figure 5B The resonant switching power conversion circuit, which indicates that the pre-charge mode has been passed, is... Figure 5B It can be seen that the resonant switching power conversion circuit after the pre-charge mode can further reduce the surge current in the startup mode and resonant voltage conversion mode by gradually increasing the conduction time.

[0143] like Figure 5B As shown, in the precharge mode, the aforementioned control circuit 2011 generates precharge operation signals Gpr2 and Gpr3 to perform, for example but not limited to, the actions described in item (4): turn on switch Q8, and control the precharge switch circuit S1 in the precharge circuit 2012 with precharge operation signal Gpr0, thereby charging the voltage drop of capacitor C1 to a second preset voltage. The second preset voltage Vpr is, for example, twice the target voltage Vtgt of the second voltage V2. Then, in the startup mode, the second voltage V2 gradually increases to the target voltage Vtgt. The voltage ranges for switching between capacitor C1 across voltage VC1, capacitor C2 across voltage VC2, and capacitor C3 across voltage VC3 also gradually increase to a stable range. In this embodiment, in the precharge mode before the startup mode, the voltage drop of capacitor C1 is precharged to the second preset voltage Vpr, reducing the surge current and ripple current of the output current (e.g., corresponding to the second current I2).

[0144] Figure 6 This is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present invention. In this embodiment, the switching converter 302 and... Figure 2Similar to the switching converter 202, the difference lies in that the inductor L1 of the switching converter 302 is directly connected in series with the third capacitor (capacitor C3) to form a resonant slot 3021, while the inductor L2 of the switching converter 302 is directly connected in series with the second capacitor (capacitor C2) to form a resonant slot 3022. In one embodiment, in the first program, multiple switches Q1 to Q10 control the resonant slot 3021 and the first capacitor (capacitor C1) to be connected in series between the first power supply and the second power supply, and control the resonant slot 3022 to be connected in parallel with the second power supply. On the other hand, in the second program, multiple switches Q1 to Q10 control the resonant slot 3022 and the first capacitor (capacitor C1) to be connected in series between the second power supply and the ground potential, and control the resonant slot 3021 to be connected in parallel with the second power supply. The switching converter 302 achieves power conversion between the first power supply and the second power supply by operating in a resonant manner through the above periodic operation. The control details of the above multiple switches Q1 to Q10 can be found in [reference needed]. Figure 2 The embodiment of the controller 301 in this embodiment may employ... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description.

[0145] Figure 7 This is a circuit diagram showing a resonant switching power conversion circuit according to another embodiment of the present invention. In this embodiment, the switching converter 402 and... Figure 2 Similar to the switching converter 202, the difference lies in that the switching converter 402 shares an inductor L, which is coupled between the second power supply and the switching node LX. In the first program, multiple switches Q1 to Q10 control the first capacitor (capacitor C1) and the third capacitor (capacitor C3), which are connected in series with the inductor L through the switching node LX before being connected in series between the first power supply and the second power supply. Furthermore, the second capacitor (capacitor C2) is controlled to be connected in parallel with the second power supply after being connected in series with the inductor L through the switching node LX. On the other hand, in the second program, multiple switches Q1 to Q10 control the second capacitor (capacitor C2) and the first capacitor (capacitor C1), which are connected in series with the inductor L through the switching node LX between the second power supply and the ground potential. Furthermore, the third capacitor (capacitor C3) is controlled to be connected in parallel with the second power supply after being connected in series with the inductor L through the switching node LX. In this embodiment, the first capacitor (capacitor C1), the second capacitor (capacitor C2), and the third capacitor (capacitor C3) all resonate with the inductor L to switch between the first and second power supplies. For control details of the aforementioned switches Q1 to Q10, please refer to [link / reference]. Figure 2 The controller 401 in this embodiment may employ... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description.

[0146] It is worth noting that the capacitor in the charging and discharging process of the embodiment resonates with the inductor, thus effectively reducing the inrush current of the capacitor during charging and discharging, and achieving zero-current switching or zero-voltage switching through the characteristics of resonance. The resonant operation will be described later, and the details will be described later.

[0147] Figure 8 Fig. 6 is a circuit schematic diagram of a resonant switching power conversion circuit according to another embodiment of the present application. Figure 8 The switching converter 302a shown can correspond to Figure 6 In particular, in the 2x conversion mode, the switch Q1 of the switching converter 302a is always on (shown as a short circuit), the switches Q2, Q3, Q8-Q10 are always off, and the switches Q4-Q7 are used to switch the second capacitor (capacitor C2) to connect the second capacitor (capacitor C2) and the inductor L2 in series between the first power supply and the second power supply in the first procedure, and to connect the second capacitor (capacitor C2) and the inductor L2 in series and then in parallel to the second power supply in the second procedure, so that the ratio of the first voltage V1 of the first power supply to the second voltage V2 of the second power supply is 2, and the second capacitor (capacitor C2) and the inductor L2 are operated in a resonant manner to achieve power conversion between the first power supply and the second power supply. In this embodiment, since the switches Q2, Q3, Q8-Q10 are always off, at least one end of the resonant tank 3021a (third capacitor (capacitor C3), inductor L1) and the first capacitor (capacitor C1) is also always floating. The controller 301a of the embodiment can be implemented using the controller architecture of Figure 3 and Figure 4 Please refer to the detailed description of Figure 3 and Figure 4 .

[0148] Figure 9 Fig. 6 is a circuit schematic diagram of a resonant switching power conversion circuit according to another embodiment of the present application. Figure 9 The switching converter 402a shown can correspond to Figure 7In the switching converter 402, specifically in this embodiment, in the 2x conversion mode, switch Q1 of the switching converter 402a is always on (shown as a short circuit), switches Q2, Q3, and Q8-Q10 are always off, and switches Q4-Q7 are used to switch the second capacitor (capacitor C2). In the first program, the second capacitor (capacitor C2) is connected in series with inductor L through switching node LX before being connected in series between the first power supply and the second power supply. In the second program, the second capacitor (capacitor C2) is connected in series with inductor L through switching node LX and then connected in parallel with the second power supply. In other words, in the second program, switches Q4-Q7 control the second capacitor (capacitor C2) to be connected in series with inductor L through switching node LX between the second power supply and the ground potential, so that the ratio of the first voltage V1 of the first power supply to the second voltage V2 of the second power supply is 2. The second capacitor (capacitor C2) and inductor L operate in a resonant manner to realize the power conversion between the first power supply and the second power supply. In this embodiment, since switches Q2, Q3, and Q8-Q10 are always off, at least one end of each of the first capacitor (capacitor C1) and the third capacitor (capacitor C3) is always floating. The controller 401a in this embodiment can adopt... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description.

[0149] Figure 10 This is a circuit diagram of a resonant switching power conversion circuit according to another embodiment of the present invention. Figure 10 The switching converter 202a shown can correspond to Figure 2In the switching converter 202, specifically in this embodiment, in the 2x conversion mode, switches Q4 and Q9 of the switching converter 202a are always on (displayed as short circuits), switches Q3, Q5, Q6, and Q10 are always off, and switches Q1, Q2, Q7, and Q8 are used to switch the first capacitor (capacitor C1). In the first program, the first capacitor (capacitor C1) is controlled to be connected in series with inductor L1 through the first switching node LX1 before being connected in series between the first power supply and the second power supply. In the second program, the first power supply is controlled to be connected in series with inductor L1 before being connected in series between the first power supply and the second power supply. Capacitor C1 is connected in series with inductor L2 through the second switching node LX2, and then connected in parallel to the second power supply. In other words, switches Q4 to Q7 in the second program control the first capacitor (capacitor C1) to be connected in series with inductor L2 through the second switching node LX2 between the second power supply and ground potential, so that the ratio of the first voltage V1 of the first power supply to the second voltage V2 of the second power supply is 2. The first capacitor (capacitor C1) and inductors L1 and L2 operate in a resonant manner to achieve power conversion between the first and second power supplies. In this embodiment, since switches Q3, Q5, Q6, and Q10 are always non-conducting, at least one end of each of the third capacitor (capacitor C3) and the second capacitor (capacitor C2) is also always floating. The controller 201a in this embodiment can adopt... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description.

[0150] Figure 11 This is a circuit diagram of a resonant switching power conversion circuit according to another embodiment of the present invention. Figure 11 The switching converter 402b shown can correspond to Figure 7 In the switching converter 402, specifically in this embodiment, in the 3x conversion mode, switch Q4 of the switching converter 402b is always on (displayed as a short circuit), switches Q5 and Q6 are always off, and switches Q1-Q3 and Q7-Q10 are used to switch the first capacitor (capacitor C1) and the third capacitor (capacitor C3). In the first program, the first capacitor (capacitor C1), the third capacitor (capacitor C3), and the inductor L are connected in series between the first power supply and the second power supply. In the second program, the first capacitor (capacitor C1) and the third capacitor (capacitor C3) are connected in parallel and then in series with the inductor L, and then in parallel with the second power supply, so that the ratio of the first voltage V1 of the first power supply to the second voltage V2 of the second power supply is 3. The first capacitor (capacitor C1) and the third capacitor (capacitor C3) and the inductor L operate in a resonant manner to realize the power conversion between the first power supply and the second power supply. In this embodiment, since switches Q5 and Q6 are always off, one end of the second capacitor (capacitor C2) is also always floating. The controller 401b in this embodiment can be adopted Figure 3 and Figure 4The controller architecture of Figure 3 and Figure 4 is implemented, please refer to the detailed description of .

[0151] Figure 12 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application. Figure 12 The switching converter 202b shown can correspond to the switching converter 202 of Figure 2 , and the operation of its switches is similar to that of the switching converter 402b, with the difference that in the first procedure, the first capacitor (capacitor C1), the third capacitor (capacitor C3) and the inductor L1 of the switching converter 202b are connected in series between the first power source and the second power source, while in the second procedure, the third capacitor (capacitor C3) and the first capacitor (capacitor C1) are connected in parallel with the inductor L1 and the inductor L2 respectively, and then connected in parallel with the second power source, so that the ratio of the first voltage V1 to the second voltage V2 is 3. The details of the operation of its switches can refer to the embodiment of Figure 11 . The controller 201b of the present embodiment can be implemented using the controller architecture of Figure 3 and Figure 4 . Please refer to the detailed description of Figure 3 and Figure 4 .

[0152] It should be noted that the above Figure 8-12 corresponds to the switch and element configuration of the aforementioned Figure 6 , Figure 7 , Figure 2 respectively, by partially switching the constant on, the other part of the switch is constantly off, and the other switches are switched according to the required mode, so that the ratio of the first voltage V1 to the second voltage V2 can be set to several different multiple relationships. In addition, Figure 8-12 is an equivalent circuit diagram showing the embodiment of the aforementioned Figure 6 , Figure 7 , Figure 2 , in which the switches that are constantly off and the capacitors that are constantly floating are omitted in the figure to simplify the figure.

[0153] Figure 13 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application. Figure 13 The switching converter 502 shown is similar to the switching converter 202 shown in Figure 2 , and in the present embodiment, the inductors L1 and L2 of the switching converter 502 have mutual inductance with each other, so that the inductor L1 current IL1 and the inductor L2 current IL2 of the switching converter 502 can have better current balance with each other, and at the same time, the capacitors C3 and C2 can also have better voltage balance with each other. The controller 501 of the present embodiment can be implemented using the controller architecture of Figure 3 and Figure 4the detailed descriptions of the controller architectures of Figure 3 and Figure 4 .

[0154] In one embodiment, the inductors Ll and L2 can be configured as coupled inductors, or as a transformer (e.g., transformer 5021).

[0155] Figure 14 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application. In one embodiment, the resonant switching power conversion circuit 60 includes a first switching converter 602 and a second switching converter 603 coupled in parallel to each other between the first power source and the second power source, in this embodiment, the first switching converter 602 and the second switching converter 603 correspond to the switching converter 302 of the foregoing Figure 6 , in this embodiment, by operating multiple switching converters in parallel, the output power can be increased, or the ripple current and the ripple voltage can be reduced. It is noted that the "parallel" of the switching converters means that the input terminals of the switching converters are electrically connected to each other, e.g., to the first power source, and the output terminals of the switching converters are electrically connected to each other, e.g., to the second power source.

[0156] In one embodiment, the first switching converter 602 and the second switching converter 603 switch the corresponding plurality of switches in each switching converter in opposite phases to each other to perform power conversion in a interleaved manner, in particular, as shown in Figure 14 , the control signals GA and GB of the switches Ql-QlO of the first switching converter 602 are in phase with the control signals GA and GB of the switching converter 302 of the foregoing Figure 6 , and the control signals GA and GB of the switches Ql l-Q20 of the second switching converter 603 are out of phase with the control signals GA and GB of the switching converter 302 of the foregoing Figure 6 , and thus also out of phase with the first switching converter 602.

[0157] The first switching converter 602 and the second switching converter 603 include the inductors Ll, L2, Ll l, L12, and are respectively connected in series with the capacitors C3, C2, C13, C12 to form resonant tanks 6021, 6022, 6031, and 6032. In this embodiment, the first switching converter 602 and the second switching converter 603 are operated in an interleaved manner to perform power conversion, and each of the first switching converter 602 and the second switching converter 603 is similar to the switching converter 302 of the foregoing Figure 6 , and performs power conversion in a resonant manner. The controller 601 of this embodiment can be implemented using the controller architectures of Figure 3 and Figure 4 , please refer to the detailed descriptions of the controller architectures of Figure 3 andFigure 4 A detailed description. For example... Figure 14 As shown, the controller 601 in this embodiment is coupled to a first power supply, a second power supply, a first switch (e.g., switch Q1 and switch Q11), and a node between the first switch and a seventh switch (e.g., the node between switch Q1 and switch Q7 and the node between switch Q11 and switch Q17).

[0158] Figure 15 This is a circuit diagram of a resonant switching power conversion circuit according to another embodiment of the present invention. Figure 15 The resonant switching power conversion circuit 70 and Figure 14 Similar to the resonant switching power conversion circuit 60, the resonant switching power conversion circuit 70 includes a first switching converter 702 and a second switching converter 703. The difference is that the first switching converter 702 shares inductor L1, while the second switching converter 703 shares inductor L11, and so on. Figure 7 In this embodiment, capacitors C3 and C2 are connected in parallel and then in series with inductor L1, similar to... Figure 7 In this embodiment, capacitors C13 and C12 are connected in parallel and then in series with inductor L11. (Similar to...) Figure 14 The resonant switching power conversion circuit 60 in this embodiment also performs power conversion by interleaving the first switching converter 702 and the second switching converter 703. The first switching converter 702 and the second switching converter 703 are each similar to those described above. Figure 7 The switching converter 402 in the middle performs power conversion in a resonant manner. The controller 701 in this embodiment can employ... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description. For example... Figure 15 As shown, the controller 701 in this embodiment is coupled to a first power supply, a second power supply, a first switch (e.g., switch Q1 and switch Q11), and a node between the first switch and a seventh switch (e.g., the node between switch Q1 and switch Q7 and the node between switch Q11 and switch Q17).

[0159] Figure 16 This is a circuit diagram of a resonant switching power conversion circuit according to another embodiment of the present invention. Figure 16 Resonant switching power conversion circuit 80 and Figure 14Similar to the resonant switching power conversion circuit 60, the resonant switching power conversion circuit 80 includes a first switching converter 802 and a second switching converter 803. The difference is that the inductors L1, L2, L11, and L12 of the first switching converter 802 and the second switching converter 803 are not directly connected in series with capacitors C3, C2, C13, and C12 respectively, but are connected in series with capacitors C3, C2, C13, and C12 through the first switching node LX1, the second switching node LX2, the first switching node LX11, and the second switching node LX12 respectively. As... Figure 14 The resonant switching power conversion circuit 60 in this embodiment also performs power conversion by interleaving the first switching converter 802 and the second switching converter 803. The first switching converter 802 and the second switching converter 803 are each similar to those described above. Figure 2 The switching converter 202 in the middle performs power conversion in a resonant manner. The controller 801 in this embodiment can employ... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description. For example... Figure 16 As shown, the controller 801 in this embodiment is coupled to a first power supply, a second power supply, a first switch (e.g., switch Q1 and switch Q11), and a node between the first switch and a seventh switch (e.g., the node between switch Q1 and switch Q7 and the node between switch Q11 and switch Q17).

[0160] Figure 17 This is a circuit diagram of a resonant switching power conversion circuit according to another embodiment of the present invention. Figure 17 Resonant switching power conversion circuit 90 and Figure 16 Similar to the resonant switching power conversion circuit 80, the inductors L1, L2, L11, and L12 in the resonant switching power conversion circuit 90 are mutually inductive. Therefore, the currents IL1 of inductor L1, IL2 of inductor L2, IL11 of inductor L11, and IL12 of inductor L12 in the resonant switching power conversion circuit 90 can have better current balance. Simultaneously, the voltages C3, C2, C13, and C12 can also have better voltage balance. In one embodiment, the resonant switching power conversion circuit 90 can be configured such that all inductors L1, L2, L11, and L12 are mutually inductive, or only some of the inductors are mutually inductive, depending on requirements. In one embodiment, inductors L1, L2, L11, and L12 can be configured as at least one transformer. The controller 901 in this embodiment can adopt... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description. For example...Figure 17 As shown, the controller 901 of the present embodiment is coupled to the first power source, the second power source, the first switches (e.g., the switches Q1 and Q11), and the nodes between the first switches and the seventh switches (e.g., the nodes between the switches Q1 and Q7 and the nodes between the switches Q11 and Q17).

[0161] Figure 18A is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application. Figure 18A The resonant switching power conversion circuit 100 shown includes the first switching converter 1002 and the second switching converter 1003, and an upper layer capacitor (the capacitor C21) and a plurality of upper layer switches (e.g., the switches Q21, Q28), wherein the first switching converter 1002 and the second switching converter 1003 may, for example, both correspond to the switching converter 302 of Figure 6 For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 18A For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 6 For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 18B For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 3 For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 4 For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 3 For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 4 For one aspect, the resonant switching power conversion circuit 100 shown is configured to have more layers based on the switching converter 302 of Figure 18A As shown, in one embodiment, the controller 1001 does not turn on the upper layer switches (e.g., the switch Q21) in the pre-charge mode, in other words, the controller 1001 of the present embodiment is coupled to the first power source, the second power source, the upper layer switches (e.g., the switch Q21), and the nodes between the upper layer switches (e.g., the switch Q21) and the first switches (e.g., the switch Q1) of the second switching converter 1003.

[0162] In one embodiment, according to the aforementioned basic topology, the input end of the first switching converter 1002 (corresponding to the first switching converter 1002b, Figure 18B ) and one end of the upper layer capacitor (the capacitor C21) are electrically connected to each other, and the input end of the second switching converter 1003 (corresponding to the second switching converter 1003b, Figure 18BThe input terminal of the first switching converter 1002 is electrically connected to the other end of the upper capacitor (capacitor C21). In addition, the output terminals of the first switching converter 1002 and the second switching converter 1003 are electrically connected to the second power supply.

[0163] In the first procedure (e.g., when control signal GA is disabled and control signal GB is enabled), multiple upper-level switches (e.g., switches Q21, Q28) and multiple switches of the first switching converter 1002 (e.g., switches Q11 to Q20) control the upper-level capacitor (capacitor C21) to be connected in series with the first switching converter 1002 and establish at least one current path between the first power supply and the second power supply. The multiple upper-level switches (e.g., switches Q21, Q28) and multiple switches of the second switching converter 1003 (e.g., switches Q1 to Q10) control the upper-level capacitor (capacitor C21) to be disconnected from the second switching converter 1003 and control the second switching converter 1003 to establish at least one current path between the second power supply and the ground potential.

[0164] On the other hand, in the second procedure (for example, when the control signal GA is enabled and the control signal GB is disabled), multiple upper-level switches (switches Q21, Q28) and multiple switches (Q1 to Q10) of the second switching converter 1003 control the second switching converter 1003 and the upper-level capacitor (capacitor C21) to be connected in series between the second power supply and the ground potential, and establish at least one current path between the second power supply and the ground potential. In addition, multiple upper-level switches (switches Q21, Q28) and multiple switches (Q11 to Q20) of the first switching converter 1002 control the upper-level capacitor (capacitor C21) and the first switching converter 1002 to be disconnected, and control the first switching converter 1002 to establish at least one current path between the second power supply and the ground potential.

[0165] The aforementioned current path is, for example, the current path established by the corresponding switch that is turned on when the control signal GA is enabled or the control signal GB is enabled.

[0166] The first switching converter 1002 and the second switching converter 1003 are also configured with, for example Figure 6 The resonant channels in the embodiment, namely resonant channels 10021, 10022, 10031, and 10032, are used to switch between the first power supply and the second power supply in a resonant manner.

[0167] In this embodiment, as Figure 18AThe ratio of the first voltage V1 to the second voltage V2 is 8. In detail, at steady state, the voltage across the capacitor C21 is 4*V2, the voltage across the capacitors C1 and C11 (both corresponding to the first capacitor in the previous embodiment) is 2*V2, and the voltage across the capacitors C3, C13 (both corresponding to the third capacitor in the previous embodiment), C2, C12 (both corresponding to the second capacitor in the previous embodiment) is V2.

[0168] Continuing to refer to Figure 18B , according to the present application, the number of layers of the pipeline resonant switching power conversion circuit can be recursively expanded by Figure 18B the basic topology, thereby achieving a higher conversion ratio between the first voltage and the second voltage. As shown in Figure 18B , any pipeline resonant switching power conversion circuit having the basic topology of Figure 18B may be used to replace the first switching converter 1002 and the second switching converter 1003 (for example, the first switching converter 1002b and the second switching converter 1003b in the figure can correspond to an N-layer pipeline resonant switching power conversion circuit, where N is an integer greater than or equal to 2), thereby obtaining a pipeline resonant switching power conversion circuit with a higher number of layers, i.e., the pipeline resonant switching power conversion circuit 100b will become an N+1-layer pipeline resonant switching power conversion circuit.

[0169] For example, as the pipeline resonant switching power conversion circuit 100 of Figure 18A is substituted into the first switching converter 1002b and the second switching converter 1003b of Figure 18B , the pipeline resonant switching power conversion circuit 100b of Figure 18B will be configured as a 16:1 pipeline resonant switching power conversion circuit. The same substitution configuration can be repeatedly used to increase the number of layers and thus continuously improve the conversion ratio of the power supply.

[0170] In this embodiment (a 16:1 resonant switching power conversion circuit), the first switching converter 1002 and the second switching converter 1003 of Figure 18A can be regarded as a bottom layer (1 layer) pipeline resonant switching power conversion circuit, and the structure thereof corresponds to the switching converter 302 of Figure 6 , and the pipeline resonant switching power conversion circuit 100 of Figure 18A can be regarded as a 2-layer pipeline resonant switching power conversion circuit. Furthermore, as the 2-layer pipeline resonant switching power conversion circuit 100 of Figure 18A is substituted into the first switching converter 1002b and the second switching converter 1003b of Figure 18B , the pipeline resonant switching power conversion circuit 100b of Figure 18BThe illustrated pipeline resonant switching power conversion circuit 100b can be considered as a 3-layer pipeline resonant switching power conversion circuit.

[0171] Figure 19 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application. Figure 19 The illustrated resonant switching power conversion circuit 110 is similar to Figure 18A The illustrated resonant switching power conversion circuit 100 differs from the resonant switching power conversion circuit 100 in that the first switching converter 1102 shares the inductor Ll 1 and the second switching converter 1103 shares the inductor Ll, and in that the resonant switching power conversion circuit 110 is operated in a similar manner to the resonant switching power conversion circuit 100b. Figure 7 In a similar manner to the resonant switching power conversion circuit 100b, the capacitor C3 is connected in parallel with the capacitor C2 and the inductor Ll is connected in series with the capacitor C3 and the capacitor C2. Figure 7 In a similar manner to the resonant switching power conversion circuit 100b, the capacitor C13 is connected in parallel with the capacitor C12 and the inductor Ll 1 is connected in series with the capacitor C13 and the capacitor C12. Figure 18A The resonant switching power conversion circuit 100 is operated in a similar manner to the resonant switching power conversion circuit 100 in that the first switching converter 1102 and the second switching converter 1103 are operated in an interleaved manner to perform power conversion, and in that the first switching converter 1102 and the second switching converter 1103 are each similar to the switching converter 402 of the resonant switching power conversion circuit 100 and perform power conversion in a resonant manner. Figure 7 The controller 1101 of the present embodiment can be implemented using the controller architecture of the controller 101 of the resonant switching power conversion circuit 100 and the controller 101 of the resonant switching power conversion circuit 100b. Figure 3 Figure 4 The controller 1101 of the present embodiment can be implemented using the controller architecture of the controller 101 of the resonant switching power conversion circuit 100 and the controller 101 of the resonant switching power conversion circuit 100b. Figure 3 Figure 4 In one embodiment, the controller 1101 is configured to operate in a pre-charge mode in which the controller 1101 is configured to turn off the upper switch (e.g., the switch Q21) of the second switching converter 1103. Figure 19

[0172] Figure 20 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application. Figure 20 The illustrated resonant switching power conversion circuit 120 is similar to Figure 18A ​​​The resonant switching power conversion circuit 100 shown differs in that the inductors L1, L2, L11, L12 of the first switching converter 1202 and the second switching converter 1203 are not directly connected in series with the capacitors C3, C2, C13, C12, respectively, but are connected in series with the capacitors C3, C2, C13, C12 through the first switching node LX1, the second switching node LX2, the first switching node LX11, the second switching node LX12, respectively. In other words, the resonant switching power conversion circuit 120 operates in a similar manner to the resonant switching power conversion circuit 100, and further operates through the inductors L1, L2, L11, L12 and the corresponding capacitors, such as Figure 2 The resonant switching power conversion circuit 100 shown differs in that the inductors L1, L2, L11, L12 of the first switching converter 1202 and the second switching converter 1203 are not directly connected in series with the capacitors C3, C2, C13, C12, respectively, but are connected in series with the capacitors C3, C2, C13, C12 through the first switching node LX1, the second switching node LX2, the first switching node LX11, the second switching node LX12, respectively. In other words, the resonant switching power conversion circuit 120 operates in a similar manner to the resonant switching power conversion circuit 100, and further operates through the inductors L1, L2, L11, L12 and the corresponding capacitors, such as Figure 3 and Figure 4 The controller architecture of Figure 3 and Figure 4 is adopted in the controller 1201 of the present embodiment. Please refer to the detailed description of Figure 20 In one embodiment, the controller 1201 does not turn on the upper switch (e.g., the switch Q21) in the pre-charge mode. In other words, the controller 1201 of the present embodiment is coupled to the first power source, the second power source, the node between the upper switch (e.g., the switch Q21) and the first switch (e.g., the switch Q1) of the second switching converter 1203.

[0173] Figure 21 is a circuit schematic diagram of a resonant switching power conversion circuit according to another embodiment of the present application. Figure 21 The resonant switching power conversion circuit 130 of Figure 20 is similar to the resonant switching power conversion circuit 120 of Figure 3 and Figure 4 The controller architecture of Figure 3 and Figure 4A detailed description. For example... Figure 21 As shown, in one embodiment, the upper switch (e.g., switch Q21) is not turned on by the controller 1301 in the precharge mode. In other words, the controller 1301 in this embodiment is coupled to the node between the first power supply, the second power supply, the upper switch (e.g., switch Q21), the upper switch (e.g., switch Q21), and the first switch (e.g., switch Q1) of the second switching converter 1303.

[0174] Figure 22 This is a circuit diagram illustrating a resonant switching power conversion circuit according to another embodiment of the present invention. Figure 22 As shown, the resonant switching power conversion circuit 140 includes resonant capacitors C1 and C3, at least one non-resonant capacitor C2, switches Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, and Q10, resonant inductors L1 and L2, and a controller 1401. In this embodiment, the controller 1401 can be... Figure 3 and Figure 4 For implementation of the controller architecture, please refer to the documentation. Figure 3 and Figure 4 A detailed description. For example... Figure 22 As shown, in one embodiment, the controller 1401 does not conduct in the precharge mode, which is the first switch (e.g., switch Q1). In other words, the controller 1401 in this embodiment is coupled to the node between the first power supply, the second power supply, the first switch (e.g., switch Q1), and the first resonant capacitor (e.g., resonant capacitor C1).

[0175] In one embodiment, in precharge mode, the control circuit of controller 1401 generates a precharge operation signal to perform at least one of the following: (1) turn on switch Q6 and control the precharge circuit to charge the voltage drop of the first resonant capacitor (e.g., resonant capacitor C1) to a first preset voltage; (2) turn on switches Q2 and Q8 and control the precharge circuit to charge the voltage drop of the non-resonant capacitor C2 to a second preset voltage; or (3) turn on switches Q2, Q3, and Q10 and control the precharge circuit to charge the voltage drop of the second resonant capacitor (e.g., resonant capacitor C3) to a third preset voltage. In one embodiment, the first preset voltage is three times the target voltage of the second voltage V2 of the second power supply, the second preset voltage is twice the target voltage of the second voltage V2, and the third preset voltage is the target voltage of the second voltage V2.

[0176] like Figure 22As shown, the controller 1401 is configured to generate a first operation signal GA and a second operation signal GB for a resonant voltage conversion mode, to correspond to a first resonant procedure and a second resonant procedure, respectively, to operate a plurality of switches Q1-Q10 to switch the electrical connection relationship of the corresponding resonant capacitors C1, C3 and the non-resonant capacitor C2. The resonant switching power conversion circuit 140 comprises at least one resonant tank, such as resonant tanks 1402 and 1403. The resonant tank 1402 has a resonant capacitor C1 and a resonant inductor L1 connected in series with each other, and the resonant tank 1403 has a resonant capacitor C3 and a resonant inductor L2 connected in series with each other. The switches Q1-Q10 are coupled to the at least one resonant tank 1402, 1403, and in the resonant voltage conversion mode, the first operation signal GA and the second operation signal GB are used to switch the electrical connection relationship of the corresponding resonant tank 1402, 1403 to correspond to the first resonant procedure and the second resonant procedure, respectively. In the first resonant procedure, the corresponding resonant tank 1402, 1403 is charged in resonance, and in the second resonant procedure, the corresponding resonant tank 1402, 1403 is discharged in resonance. The at least one non-resonant capacitor C2 is coupled to the at least one resonant tank 1402, 1403, and in the resonant voltage conversion mode, the first operation signal GA and the second operation signal GB are used to switch the electrical connection relationship of the non-resonant capacitor C2 and the at least one resonant tank 1402, 1403. The voltage across the non-resonant capacitor C2 maintains a fixed proportion of the first voltage V1 of the first power source, such as one-half of the first voltage V1 in the present embodiment. The resonant switching power conversion circuit 140 operates in a start-up mode after the pre-charge mode ends, and operates in the resonant voltage conversion mode after the start-up mode ends. The first resonant procedure and the second resonant procedure are repeatedly interleaved with each other to convert the first power source to the second power source or to convert the second power source to the first power source. In the resonant voltage conversion mode, the first operation signal GA and the second operation signal GB are each switched to the on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, so that the first resonant procedure and the second resonant procedure do not overlap with each other.

[0177] In the first resonance procedure, according to the first operation signal GA, switches Q1, Q3, Q5, Q8, and Q9 are turned on, while switches Q2, Q4, Q6, Q7, and Q10 are turned off. This causes the resonant capacitor C1 and resonant inductor L1 of the resonant tank 1402 to be connected in series between the first power supply and the second power supply, and causes the non-resonant capacitor C2, the resonant capacitor C3 of the resonant tank 1403, and the resonant inductor L2 to be connected in series between the ground potential and the second power supply. This charges the resonant capacitors C1 and C3 and discharges the non-resonant capacitor C2. In the second resonance procedure, according to the second operation signal GB, switches Q2, Q4, Q6, Q7, and Q10 are turned on, while switches Q1, Q3, Q5, Q8, and Q9 are turned off. This causes the non-resonant capacitor C2, the resonant capacitor C1 of the resonant tank 1402, and the resonant inductor L1 to be connected in series between the ground potential and the second power supply. It also causes the resonant capacitor C3 of the resonant tank 1403 and the resonant inductor L2 to be connected in series between the ground potential and the second power supply. This discharges the resonant capacitors C1 and C3 and charges the non-resonant capacitor C2.

[0178] Regarding having as Figure 22 The operation of the resonant switching power conversion circuit 140 of the resonant slots 1402 and 1403 shown is well known to those skilled in the art and will not be described in detail here. In one embodiment, the resonant switching power conversion circuit 140 of the present invention can be hot-swapped from the first power source into the entire circuit.

[0179] Figure 23 This is a circuit diagram of a resonant switching power conversion circuit according to another embodiment of the present invention. Figure 23 As shown, the resonant switching power conversion circuit 150 of the present invention includes capacitors C1-C3, switches Q1-Q10, and inductors L1-L3. Switches Q1-Q3 are connected in series with their corresponding capacitors C1-C3, and capacitors C1-C3 are connected in series with their corresponding inductors L1-L3. It should be noted that the number of capacitors in the power conversion circuit of the present invention is not limited to three in this embodiment, but may also be two or four or more, and the number of inductors is not limited to three in this embodiment, but may also be two or four or more.

[0180] The switches Q1-Q10 can switch the connection of the corresponding capacitors C1-C3 and inductors L1-L3 according to the corresponding operation signals. In the first procedure, the switches Q1-Q4 are turned on, and the switches Q5-Q10 are turned off, so that the capacitors C1-C3 and the inductors L1-L3 are connected in series with each other between the first power supply and the second power supply to form a first current path to perform the charging procedure. In the second procedure, the inductors L1-L3 can be used as discharge inductors, the switches Q5-Q10 are turned on, and the switches Q1-Q4 are turned off, so that the capacitors C1 and the corresponding inductors L1 are connected in series between the second power supply and the ground potential, the capacitors C2 and the corresponding inductors L2 are connected in series between the second power supply and the ground potential, and the capacitors C3 and the corresponding inductors L3 are connected in series between the second power supply and the ground potential to form a plurality of second current paths to perform the discharging procedure. It should be noted that the first procedure and the second procedure are staggered in different time periods, rather than simultaneously, to convert the first power supply to the second power supply or convert the second power supply to the first power supply. The first procedure and the second procedure are repeatedly staggered with each other to convert the first power supply to the second power supply or convert the second power supply to the first power supply. In this embodiment, the DC bias of each capacitor C1, C2, C3 is the second voltage V2 of the second power supply, so the capacitors C1, C2, C3 in this embodiment need to withstand a lower rated voltage, so smaller volume capacitors can be used.

[0181] In an embodiment, the first procedure has a first resonant frequency, and the second procedure has a second resonant frequency. In a preferred embodiment, the first resonant frequency and the second resonant frequency are the same.

[0182] In an embodiment, the voltage conversion ratio of the first power supply and the second power supply of the resonant switching power conversion circuit 150 can be 4:1, 3:1, or 2:1. It should be noted that this embodiment is a 4:1 power conversion circuit, but by controlling the off or on of the switches Q1-Q10, the power conversion circuit of this embodiment can be changed to a 3:1 power conversion circuit, for example, the switch Q7 is always on, and the switches Q4 and Q10 are always off, then it can be changed to a 3:1 power conversion circuit, and the way to change to a 2:1 power conversion circuit is the same. The controller 1501 of this embodiment can be implemented by using the controller architecture of Figure 3 and Figure 4 Please refer to the detailed description of Figure 3 and Figure 4 . As shown in Figure 23 , in an embodiment, the first switch (for example, switch Q1) is turned off by the controller 1501 in the pre-charge mode, in other words, the controller 1501 of this embodiment is coupled to the first power supply, the second power supply, the first switch (for example, switch Q1), and the node between the first switch (for example, switch Q1) and the fifth switch (for example, switch Q5).

[0183] Figure 24 Figure 7 shows a circuit schematic of a resonant switching power conversion circuit according to another embodiment of the present application. This embodiment differs from the previous embodiment in that the plurality of capacitors share a charging inductor or a discharging inductor. Thus, regardless of the number of capacitors, only one charging inductor and one discharging inductor are needed, further reducing the number of inductors. As shown in Figure 7, the resonant switching power conversion circuit 160 includes capacitors C1-C3, switches Q1-Q10, and inductors L1-L2. Switches Q1-Q3 are connected in series with corresponding capacitors C1-C3, and switch Q4 is connected in series with inductor L1. It should be noted that the number of capacitors in the resonant switching power conversion circuit of the present application is not limited to three as in this embodiment, but can be two or more than four. Figure 24

[0184] Switches Q1-Q10 can switch the electrical connection between corresponding capacitors C1-C3 and inductors L1 and L2 according to corresponding operation signals. In a first procedure, according to a first operation signal GA, switches Q1-Q4 are turned on and switches Q5-Q10 are turned off, so that capacitors C1-C3 are connected in series with each other and in series with inductor L1 between the first power source and the second power source to form a first current path for charging. In a second procedure, according to a second operation signal GB, switches Q5-Q10 are turned on and switches Q1-Q4 are turned off, so that capacitors C1-C3 are connected in parallel with each other and in series with inductor L2 between the second power source and ground to form a plurality of second current paths for discharging. It should be noted that the first procedure and the second procedure are performed in different time periods and not simultaneously, so as to convert the first power source to the second power source or vice versa. In this embodiment, the DC bias of each capacitor C1, C2, and C3 is the second voltage V2 of the second power source, so the capacitors C1, C2, and C3 in this embodiment need to withstand a lower rated voltage and thus smaller capacitors can be used.

[0185] In one embodiment, the first procedure has a first resonant frequency and the second procedure has a second resonant frequency. In a preferred embodiment, the first resonant frequency is the same as the second resonant frequency. In another embodiment, the first resonant frequency is different from the second resonant frequency. In one embodiment, the inductance of inductor L1 is equal to the inductance of inductor L2. In another embodiment, the inductance of inductor L1 is different from the inductance of inductor L2. The controller 1601 of this embodiment can be implemented using the controller architecture of Figure 3 and Figure 4 Please refer to the detailed description of Figure 3 and Figure 4 for more information. As shown in Figure 7, the controller 1601 of this embodiment is connected to switches Q1-Q10 and inductors L1-L2. Figure 24 ​As shown, in an embodiment, the controller 1601 does not turn on the first switch (e.g., switch Q1) in the pre-charge mode. In other words, the controller 1601 in this embodiment is coupled to the first power source, the second power source, the first switch (e.g., switch Q1), and a node between the first switch (e.g., switch Q1) and the fifth switch (e.g., switch Q5).

[0186] Figure 25 Fig. 17 is a circuit schematic diagram showing a resonant switching power conversion circuit according to yet another embodiment of the present application. In this embodiment, the charging inductor and the discharging inductor can be the same inductor LI. Such a configuration can further reduce the number of inductors. As shown, the resonant switching power conversion circuit 170 of the present application includes capacitors C1-C3, switches Q1-Q10, and inductor LI. Switches Q1-Q3 are respectively coupled in series with corresponding capacitors C1-C3, and switch Q4 is coupled in series with inductor LI. It should be noted that the number of capacitors in the resonant switching power conversion circuit of the present application is not limited to three as in this embodiment, but can be two or more than four. Figure 25

[0187] It should be noted that in this embodiment, the charging inductor and the discharging inductor are the same inductor LI. In the second procedure, the capacitors C1-C3 are coupled in parallel with each other and then coupled in series with the same inductor LI by switching of switches Q1-Q10. The charging inductor and the discharging inductor being the same inductor LI means that in the first procedure (also referred to as the charging procedure) and the second procedure (also referred to as the discharging procedure), the inductor LI current IL1 and the inductor L2 current IL2 flow through only the same inductor LI and do not flow through other inductor elements.

[0188] Switches Q1-Q10 can switch the electrical connection relationship between the corresponding capacitors C1-C3 and inductor LI according to corresponding operation signals. In the first procedure, according to the first operation signal GA, switches Q1-Q4 are turned on and switches Q5-Q10 are turned off, so that the capacitors C1-C3 are coupled in series with each other and then coupled in series with inductor LI between the first power source and the second power source to form a first current path to perform the charging procedure. In the second procedure, according to the second operation signal GB, switches Q5-Q10 are turned on and switches Q1-Q4 are turned off, so that the capacitors C1-C3 are coupled in parallel with each other and then coupled in series with inductor LI between the second power source and the ground potential to form a plurality of second current paths to perform the discharging procedure. It should be noted that the first procedure and the second procedure are repeatedly interleaved in different time periods rather than simultaneously performed to convert the first power source to the second power source or convert the second power source to the first power source. In this embodiment, the DC bias voltage of each capacitor C1-C3 is the second voltage V2 of the second power source, so the capacitors C1-C3 in this embodiment need to withstand a lower rated voltage, and therefore smaller capacitors can be used. ​

[0189] In one embodiment, the voltage conversion ratio of the first power source to the second power source of the resonant switching power conversion circuit 170 can be 4: 1, 3: 1 or 2: 1.

[0190] In one embodiment, the voltage conversion ratio of the resonant switching power conversion circuit 170 can be flexibly adjusted, for example, in the first mode and the second mode, by selecting switch Q7 to be always on and selecting switches Q10 and Q4 to be always off, the voltage conversion ratio of the resonant switching power conversion circuit 170 can be adjusted to be 3: 1. Similarly, for example, switch Q6 can be selected to be always on and switches Q9, Q3, Q7, Q10 and Q4 can be selected to be always off, the voltage conversion ratio of the resonant switching power conversion circuit 170 can be adjusted to be 2: 1. The controller 1701 of the present embodiment can be implemented using the controller architecture of Figure 3 and Figure 4 The detailed descriptions of the controller architecture of Figure 3 and Figure 4 are referred to. As shown in Figure 25 In one embodiment, the controller 1701 does not turn on the first switch (e.g. switch Q1) in the pre-charge mode, in other words, the controller 1701 of the present embodiment is coupled to the first power source, the second power source, the first switch (e.g. switch Q1), the node between the first switch (e.g. switch Q1) and the fifth switch (e.g. switch Q5).

[0191] The present application provides a resonant switching power conversion circuit as described above, which can achieve pre-charge operation mode and hot plug function using existing switches, can use existing power stage components to implement start-up operation, does not need additional front-end DC-DC converter for start-up control, uses less components and saves space, has no power loss of the front-end DC-DC converter and thus can improve power conversion efficiency, can reduce inrush current, can support soft-start and can support parallel operation for multi-phase resonant switching capacitor converter (RSCC).

[0192] The above has been described for the preferred embodiments of the present application, but the above is only for those skilled in the art to easily understand the content of the present application, and is not intended to limit the broadest scope of the present application. The various embodiments described are not limited to separate applications, but can also be combined, for example, two or more embodiments can be combined, and parts of one embodiment can also be used to replace corresponding components in another embodiment. In addition, those skilled in the art can think of various equivalent changes and various combinations under the same spirit of the present application, for example, the present application refers to "processing or operating or generating an output result according to a certain signal", which is not limited to the signal itself, but also includes, if necessary, voltage-current conversion, current-voltage conversion, and / or scaling conversion, etc., and then processing or operating according to the converted signal to generate an output result. Therefore, those skilled in the art can think of various equivalent changes and various combinations under the same spirit of the present application, and the combination methods are various, which are not listed one by one here. Therefore, the scope of the present application should cover all the above and other equivalent changes.

Claims

1. A resonant switching power conversion circuit for converting a first power source to a second power source or converting the second power source to the first power source, the resonant switching power conversion circuit comprising: at least one switching converter; a control circuit for controlling the switching converter; and a pre-charge circuit coupled between the control circuit and the at least one switching converter; wherein, the switching converter comprises: a plurality of capacitors having a first capacitor, a second capacitor and a third capacitor; a plurality of switches coupled with the plurality of capacitors and controlled by the control circuit for switching electrical connection relationship of the plurality of capacitors, the plurality of switches having a first switch, a second switch, a third switch and other switches, one end of the first capacitor is connected to the first power source via the first switch, the other end of the first capacitor is connected to one end of the third capacitor via the second switch, one end of the second capacitor is connected to the first power source via one of the other switches corresponding to the first switch; at least one first inductor, one end of the at least one first inductor is connected to the other end of the third capacitor via the third switch, the other end of the at least one first inductor is connected to the second power source; and at least one second inductor, one end of the at least one second inductor is connected to the other end of the second capacitor via one of the other switches corresponding to the second capacitor, the other end of the at least one second inductor is connected to the second power source; wherein, the control circuit is coupled to the first power source, the second power source and the plurality of switches, the control circuit is used to control the first switch to control the electrical connection relationship of the first power source and the first capacitor, and control other switches of the plurality of switches to control the pre-charge circuit to charge the voltage of at least one of the plurality of capacitors to a preset voltage when the voltage of at least one of the plurality of capacitors is lower than the preset voltage when the switching converter operates in a pre-charge mode; wherein, in a start-up mode, a first operation signal and at least one second operation signal are used to correspondingly operate the plurality of switches to switch the electrical connection relationship of the capacitors corresponding to the plurality of switches, so that the resonant switching power conversion circuit operates in the start-up mode after the pre-charge mode ends; wherein, in the start-up mode, the first operation signal and the at least one second operation signal are each switched to an on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, wherein the lengths of the plurality of on periods gradually increase; wherein, in a resonant voltage conversion mode, the first operation signal and the at least one second operation signal are used to correspondingly operate the plurality of switches to switch the electrical connection relationship of the capacitors corresponding to the plurality of switches, so that the resonant switching power conversion circuit operates in the resonant voltage conversion mode to convert the first power source to the second power source or convert the second power source to the first power source after the start-up mode ends; wherein, in the resonant voltage conversion mode, the first operation signal and the at least one second operation signal are each switched to the on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, so that a first procedure and at least one second procedure of the resonant voltage conversion mode do not overlap with each other. In the first procedure, the first capacitor and the third capacitor are connected in series with the at least one first inductor between the first power source and the second power source to form a first current path by controlling the switching of the plurality of switches by the first operation signal. In the at least one second procedure, the second capacitor, the first capacitor and the at least one second inductor are connected in series between the second power source and a ground potential to form a second current path by controlling the switching of the plurality of switches by the at least one second operation signal. The first procedure and the at least one second procedure are repeatedly interleaved with each other to convert the first power source to the second power source or convert the second power source to the first power source.

2. The resonant switching power conversion circuit of claim 1, wherein, The preset voltage is a target voltage of the second voltage of the second power source.

3. The resonant switching power conversion circuit of claim 1, wherein, The preset voltage is a positive integer multiple of a target voltage of the second voltage of the second power source.

4. The resonant switching power conversion circuit of claim 1, wherein, The pre-charge circuit includes: a current source for generating a pre-charge current; and a pre-charge switch circuit coupled between the current source and the plurality of switches except the first switch, wherein in the pre-charge mode, the control circuit controls the pre-charge switch circuit and the plurality of switches except the first switch to control the electrical connection relationship between the current source and the at least one of the plurality of capacitors, and thereby charges the at least one of the plurality of capacitors to the preset voltage according to the pre-charge current.

5. The resonant switching power conversion circuit of claim 1, wherein, The control circuit includes: a duty cycle determination circuit for comparing a ramp-up voltage of a ramp-up node with a periodic waveform signal to generate a duty cycle signal; a duty cycle distribution circuit for generating the first operation signal and the at least one second operation signal according to the duty cycle signal, respectively; and a ramp-up voltage generation circuit coupled with the duty cycle determination circuit for generating the ramp-up voltage of the ramp-up node in the start-up mode. The ramp-up voltage of the ramp-up node gradually increases in the start-up mode, so that the duty cycles of the first operation signal and the at least one second operation signal gradually increase correspondingly.

6. The resonant switching power conversion circuit of claim 1, wherein, In the pre-charge mode, the control circuit controls the conduction degree of the first switch, so that a pre-charge current flows from the first power source to the at least one of the plurality of capacitors through the first switch to charge the at least one of the plurality of capacitors to the preset voltage.

7. The resonant switching power conversion circuit of claim 1, wherein, In the first procedure, the second capacitor is connected in parallel with the second power source by controlling the switching of the plurality of switches by the first operation signal, and in the at least one second procedure, the third capacitor is connected in parallel with the second power source by controlling the switching of the plurality of switches by the at least one second operation signal, wherein the second capacitor connected in parallel with the second power source in the first procedure is different from the third capacitor connected in parallel with the second power source in the second procedure.

8. The resonant switching power conversion circuit of claim 1, wherein, The plurality of switches includes: the first switch, the second switch, the third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch and a tenth switch. The first switch, the second switch and the third switch are turned on to control the first capacitor and the third capacitor in series between the first power supply and the second power supply, the fourth switch and the fifth switch are turned on to control the second capacitor and the second power supply in parallel, and the sixth switch to the tenth switch are not turned on in the first procedure; The sixth switch, the seventh switch and the eighth switch are turned on to control the second capacitor, the first capacitor and the at least one second inductor in series between the second power supply and the ground potential, and the ninth switch and the tenth switch are turned on to control the third capacitor and the second power supply in parallel in the second procedure.

9. The resonant switching power conversion circuit of claim 8 wherein, The plurality of capacitors further includes an output capacitor coupled with the first capacitor, the second capacitor and the third capacitor, the preset voltage includes a first preset voltage and a second preset voltage, and the control circuit performs at least one of the following in the pre-charging mode: The fourth switch, the fifth switch, the seventh switch, the ninth switch and the tenth switch are turned on, and the pre-charging circuit is controlled to charge the voltage drop of the output capacitor, the third capacitor and the second capacitor to the first preset voltage; The second switch and the tenth switch are turned on, and the pre-charging circuit is controlled to charge the voltage drop of the third capacitor to the first preset voltage; The fifth switch, the seventh switch and the eighth switch are turned on, and the pre-charging circuit is controlled to charge the voltage drop of the second capacitor and the first capacitor to the first preset voltage; or The eighth switch is turned on, and the pre-charging circuit is controlled to charge the voltage drop of the first capacitor to the second preset voltage.

10. The resonant switching power conversion circuit of claim 9, wherein, The first preset voltage is a target voltage of a second voltage of the second power supply, and the second preset voltage is twice the target voltage of the second voltage of the second power supply.

11. The resonant switching power conversion circuit of claim 1, wherein, Further comprising one of the following: (1) wherein, The third capacitor is further directly in series with the first inductor to form a first resonance tank, and the second capacitor is further directly in series with the second inductor to form a second resonance tank; In the first procedure, the plurality of switches further control the first resonance tank and the first capacitor in series between the first power supply and the second power supply, and further control the second resonance tank and the second power supply in parallel; In the second procedure, the plurality of switches further control the second resonance tank and the first capacitor in series between the second power supply and the ground potential, and further control the first resonance tank and the second power supply in parallel; (2) The first inductor and the second inductor are a single same inductor coupled between the second power supply and a switching node; In the first procedure, the plurality of switches further control the first capacitor and the third capacitor in series through the switching node and the inductor before being in series between the first power supply and the second power supply, and further control the second capacitor in parallel with the second power supply through the switching node and the inductor; and In the second procedure, the plurality of switches further control the second capacitor and the first capacitor in series through the switching node and the inductor before being in series between the second power supply and the ground potential, and further control the third capacitor in parallel with the second power supply through the switching node and the inductor. (3) wherein the first inductor is coupled between the second power source and a first switching node, and the second inductor is coupled between the second power source and a second switching node; wherein in the first procedure, the plurality of switches further control the first capacitor and the third capacitor to be connected in series through the first switching node and the first inductor before being connected in series between the first power source and the second power source, and further control the second capacitor to be connected in parallel with the second power source through the second switching node and the second inductor; wherein in the second procedure, the plurality of switches further control the second capacitor and the first capacitor to be connected in series through the second switching node and the second inductor before being connected in series between the second power source and the ground potential, and further control the third capacitor to be connected in parallel with the second power source through the first switching node and the first inductor.

12. The resonant switching power conversion circuit of claim 1, wherein, The at least one switching converter includes a first switching converter and a second switching converter, wherein the first switching converter and the second switching converter are coupled in parallel with each other between the first power source and the second power source, wherein the first switching converter and the second switching converter switch the corresponding plurality of switches in each switching converter in opposite phases with each other.

13. The resonant switching power conversion circuit of claim 11, wherein, The resonant switching power conversion circuit has feature (3), and the first inductor and the second inductor are both operated in continuous conduction mode.

14. The resonant switching power conversion circuit of claim 1, wherein, Further comprising an upper layer capacitor and a plurality of upper layer switches, wherein the at least one switching converter includes a first switching converter and a second switching converter; wherein the upper layer capacitor, the plurality of upper layer switches, the first switching converter and the second switching converter are coupled with each other in a basic topology; wherein in the first procedure, the plurality of upper layer switches control the first switching converter and the upper layer capacitor to be connected in series between the first power source and the second power source, and control the second switching converter to be connected in parallel with the second power source; wherein in the second procedure, the plurality of upper layer switches control the second switching converter and the upper layer capacitor to be connected in series between the second power source and the ground potential, and control the first switching converter to be connected in parallel with the second power source.

15. The resonant switching power conversion circuit of claim 14, wherein, The ratio of the first voltage of the first power source to the second voltage of the second power source is 8.

16. The resonant switching power conversion circuit of claim 14, wherein, Further comprising a further upper layer capacitor, a plurality of further upper layer switches, a further upper layer first switching converter and a further upper layer second switching converter, wherein the further upper layer capacitor, the plurality of further upper layer switches, the further upper layer first switching converter and the further upper layer second switching converter are coupled with each other in a recursive expansion manner corresponding to the basic topology; wherein the further upper layer first switching converter and the further upper layer second switching converter recursively correspond to the resonant switching power conversion circuit of the next layer.

17. The resonant switching power conversion circuit of claim 1, wherein, The at least one first inductor is a plurality of charging inductors, and the plurality of capacitors are respectively connected in series with the plurality of charging inductors. The at least one second inductor is a plurality of discharging inductors. In the first procedure, the plurality of capacitors and the plurality of charging inductors are connected in series with each other between the first power supply and the second power supply through switching of the plurality of switches to form the first current path. In the second procedure, the plurality of charging inductors are used as the plurality of discharging inductors, and the plurality of discharging inductors and the plurality of capacitors are respectively connected in series with each other between the second power supply and the ground potential through switching of the plurality of switches to form the plurality of second current paths, wherein the plurality of second current paths are connected in parallel with each other.

18. The resonant switching power conversion circuit of claim 1, wherein, The at least one first inductor and the at least one second inductor have mutual inductance with each other.

19. The resonant switching power conversion circuit of claim 18, wherein, The at least one first inductor and the at least one second inductor having mutual inductance with each other are configured as a mutual inductor or as a transformer.

20. The resonant switching power conversion circuit of claim 1, wherein, The at least one first inductor is a single first inductor, and the at least one second inductor is a single second inductor.

21. The resonant switching power conversion circuit of claim 20 wherein, The inductance value of the single first inductor is equal to the inductance value of the single second inductor.

22. The resonant switching power conversion circuit of claim 1, wherein, The at least one first inductor and the at least one second inductor are a single same inductor.

23. The resonant switching power conversion circuit of claim 1 or 20, wherein, The first procedure has a first resonant frequency, and the second procedure has a second resonant frequency, and the first resonant frequency is the same as the second resonant frequency.

24. The resonant switching power conversion circuit of claims 1, 20, 21 or 22, wherein, The first procedure has a first resonant frequency, and the second procedure has a second resonant frequency, and the first resonant frequency is different from the second resonant frequency.

25. The resonant switching power conversion circuit of claims 1, 20, 21 or 22, wherein, The voltage conversion ratio of the first voltage of the first power supply to the second voltage of the second power supply of the switching converter is 4:1, 3:1, or 2:

1.

26. The resonant switching power conversion circuit of claim 1, wherein, The voltage conversion ratio of the first voltage of the first power supply to the second voltage of the second power supply of the switching converter is 4:

1.

27. The resonant switching power conversion circuit of claim 26 wherein, In a steady state, the ratio of the voltage across the first capacitor to the second voltage is 2, the ratio of the voltage across the third capacitor to the second voltage is 1, and the ratio of the voltage across the second capacitor to the second voltage is 1.

28. The resonant switching power conversion circuit of claim 1, wherein, The first inductor and the second inductor are a single same inductor. In a 2 times conversion mode, part of the plurality of switches are always on, another part of the plurality of switches are always off, and another part of the plurality of switches are used to switch one of the second capacitor or the first capacitor to connect the capacitor and the inductor in series between the first power supply and the second power supply in the first procedure, and to connect the capacitor and the inductor in series and then in parallel between the second power supply in the second procedure, so that the ratio of the first voltage of the first power supply to the second voltage of the second power supply is 2, wherein the inductor and the capacitor operate in a resonant manner to achieve power conversion between the first power supply and the second power supply.

29. The resonant switching power conversion circuit of claim 1, wherein, In a 2-times conversion mode, part of the plurality of switches are constantly on, another part of the plurality of switches are constantly off, and another part of the plurality of switches are used to switch the first capacitor, so that in the first procedure, the first capacitor and the first inductor are connected in series between the first power supply and the second power supply, and in the second procedure, the first capacitor and the second inductor are connected in series and then connected in parallel to the second power supply, so that the ratio of the first voltage of the first power supply to the second voltage of the second power supply is 2, wherein the first inductor and the second inductor operate in a resonant manner with the first capacitor to achieve power conversion between the first power supply and the second power supply.

30. The resonant switching power conversion circuit of claim 1, wherein, The first inductor and the second inductor are a single same inductor, in a 3-times conversion mode, part of the plurality of switches are constantly on, another part of the plurality of switches are constantly off, and another part of the plurality of switches are used to switch the first capacitor and the third capacitor, so that in the first procedure, the first capacitor, the third capacitor and the inductor are connected in series between the first power supply and the second power supply, and in the second procedure, the first capacitor and the third capacitor are connected in parallel and then connected in series with the inductor, and then connected in parallel to the second power supply, so that the ratio of the first voltage of the first power supply to the second voltage of the second power supply is 3, wherein the inductor and the first capacitor, and / or the inductor and the third capacitor, operate in a resonant manner to achieve power conversion between the first power supply and the second power supply.

31. The resonant switching power conversion circuit of claim 1, wherein, In a 3-times conversion mode, part of the plurality of switches are constantly on, another part of the plurality of switches are constantly off, and another part of the plurality of switches are used to switch the first capacitor and the third capacitor, so that in the first procedure, the first capacitor, the third capacitor and the first inductor are connected in series between the first power supply and the second power supply, and in the second procedure, the first capacitor and the third capacitor are connected in series with the second inductor and the first inductor respectively, and then connected in parallel to the second power supply, so that the ratio of the first voltage of the first power supply to the second voltage of the second power supply is 3, wherein the second inductor and the first capacitor, and / or the first inductor and the third capacitor, operate in a resonant manner to achieve power conversion between the first power supply and the second power supply.

32. The resonant switching power conversion circuit of claim 1, wherein, The predetermined voltage and the first voltage of the first power supply have a fixed proportional relationship.

33. The resonant switching power conversion circuit of claim 1, wherein, The first inductor and the second inductor are a single same inductor, and the capacitance of the first capacitor is much larger than the capacitances of the third capacitor and the second capacitor, so that the first resonant frequency of the third capacitor and the inductor, and the second resonant frequency of the second capacitor and the inductor, are both higher than or equal to 10 times the third resonant frequency of the first capacitor and the inductor.

34. A resonant switching power conversion circuit for converting a first power supply to a second power supply or converting the second power supply to the first power supply, the resonant switching power conversion circuit comprising: at least one resonant tank having a resonant capacitor and a resonant inductor connected in series with each other; a plurality of switches coupled to the at least one resonant tank, in a resonant voltage conversion mode, according to a corresponding first operation signal and a second operation signal, to switch the electrical connection relationship of the corresponding resonant tank to correspond to a first resonant procedure and a second resonant procedure, wherein in the first resonant procedure, resonant charging the corresponding resonant tank, and in the second resonant procedure, resonant discharging the corresponding resonant tank; a control circuit for controlling the plurality of switches; a pre-charge circuit coupled between the control circuit and the plurality of switches except for a first switch; and at least one non-resonant capacitor coupled to the at least one resonant tank, in the resonant voltage conversion mode, the first operation signal and the second operation signal switch the electrical connection relationship of the non-resonant capacitor and the at least one resonant tank, and the voltage across the non-resonant capacitor is maintained in a fixed ratio to the first power supply; wherein the control circuit is coupled to the first power supply, the second power supply and the plurality of switches, the control circuit is configured to control the first switch of the plurality of switches to control the electrical connection relationship of the first power supply and the at least one resonant tank, and to control the other switches of the plurality of switches to control the pre-charge circuit to charge at least one of the resonant capacitor and the at least one non-resonant capacitor to a preset voltage when the voltage of the at least one of the resonant capacitor and the at least one non-resonant capacitor is lower than the preset voltage, when the resonant switching power conversion circuit operates in a pre-charge mode; wherein the first switch is electrically connected between the first power supply and the at least one resonant tank; wherein in a start-up mode, the first operation signal and the second operation signal are respectively configured to correspondingly operate the plurality of switches to switch the electrical connection relationship of the non-resonant capacitor and the at least one resonant tank, so that the resonant switching power conversion circuit operates in the start-up mode after the pre-charge mode ends; wherein in the start-up mode, the first operation signal and the second operation signal are respectively switched to an on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, wherein the lengths of the plurality of on periods gradually increase; wherein in the resonant voltage conversion mode, the first operation signal and the second operation signal are respectively switched to the on level for a plurality of on periods, and the plurality of on periods do not overlap with each other, so that the first resonant procedure and the second resonant procedure do not overlap with each other, so that the resonant switching power conversion circuit operates in the resonant voltage conversion mode after the start-up mode ends, the first resonant procedure and the second resonant procedure are repeatedly interleaved with each other to convert the first power supply to the second power supply or convert the second power supply to the first power supply; wherein the other switches of the plurality of switches except for the first switch are respectively coupled between the at least one resonant tank and the second power supply or between the at least one resonant tank and a ground potential; wherein in the first resonant procedure, the at least one resonant tank is connected in series between the first power supply and the second power supply, and in the second resonant procedure, the non-resonant capacitor and the at least one resonant tank are connected in series between the ground potential.

35. The resonant switching power conversion circuit of claim 34 wherein, The preset voltage is a target voltage of the second voltage of the second power supply.

36. The resonant switching power conversion circuit of claim 34 wherein, The preset voltage is a positive integer multiple of a target voltage of the second voltage of the second power supply.

37. The resonant switching power conversion circuit of claim 34 wherein, The pre-charge circuit comprises: a current source configured to generate a pre-charge current; and a pre-charge circuit comprises: a pre-charge switch circuit coupled between the current source and the plurality of switches other than the first switch, wherein in the pre-charge mode, the control circuit controls the pre-charge switch circuit and the plurality of switches other than the first switch to control the electrical connection between the current source and the at least one of the resonance capacitor and the at least one non-resonance capacitor, and to charge the at least one of the resonance capacitor and the at least one non-resonance capacitor to the preset voltage according to a pre-charge current.

38. The resonant switching power conversion circuit of claim 34 wherein, The control circuit includes: a duty cycle decision circuit configured to compare a ramp-up voltage of a ramp-up node with a periodic waveform signal to generate a duty cycle signal; a duty cycle distribution circuit configured to generate the first operation signal and the second operation signal according to the duty cycle signal, respectively; and a ramp-up voltage generation circuit coupled to the duty cycle decision circuit and configured to generate the ramp-up voltage of the ramp-up node in the start-up mode. The ramp-up voltage of the ramp-up node gradually increases in the start-up mode, so that the duty cycles of the first operation signal and the at least one second operation signal gradually increase.

39. The resonant switching power conversion circuit of claim 34 wherein, In the pre-charge mode, the control circuit controls the conduction degree of the first switch to make a pre-charge current flow from the first power source to the at least one of the resonance capacitor and the at least one non-resonance capacitor through the first switch, so as to charge the at least one of the resonance capacitor and the at least one non-resonance capacitor to the preset voltage.

40. The resonant switching power conversion circuit of claim 34 wherein, The preset voltage and the first voltage of the first power source have a fixed proportional relationship.

41. The resonant switching power conversion circuit of claim 34 wherein, The at least one resonance capacitor includes a first resonance capacitor and a second resonance capacitor, the preset voltage includes a first preset voltage, a second preset voltage and a third preset voltage, the plurality of switches includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch and a tenth switch, and in the pre-charge mode, the control circuit performs at least one of the following: conducting the sixth switch and controlling the pre-charge circuit to charge the first resonance capacitor to the first preset voltage; conducting the second switch and the eighth switch and controlling the pre-charge circuit to charge the non-resonance capacitor to the second preset voltage; or conducting the second switch, the third switch and the tenth switch and controlling the pre-charge circuit to charge the second resonance capacitor to the third preset voltage.

42. The resonant switching power conversion circuit of claim 41 wherein, The first preset voltage is three times a target voltage of a second voltage of the second power source, the second preset voltage is twice the target voltage of the second voltage, and the third preset voltage is the target voltage of the second voltage.

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