Multi-level switching power supply modulation circuit, driving circuit, control method and device

Abstract

The invention discloses a multi-level switching power supply modulation circuit, which comprises first switching circuits connected in series between n-1 input ends in N input ends of N input levels and output ends of the n-1 input levels respectively, and second switching circuits connected in series between the n-1 input ends and the output ends of the n-1 input levels respectively, the remaining input end of the N input ends and the output end used for outputting the input level from the input end are an equipotential point, the equipotential point is the last output end, the N input levels are different, branch circuits sequentially connected with the output ends are respectively connected with a second switch circuit in series, and the second switch circuit is connected with the output end in series. The first output end connected with the first second switching circuit is connected to a load, and the last second driving circuit used for driving the last second switching circuit is provided with a driving voltage for the last second driving circuit by the auxiliary power supply, and when the input level output by the last output end is output to the load, the first output end is connected with the first second switching circuit. The auxiliary power supply provides driving voltage for each driving circuit. The driving circuit is simplified, and the loss is reduced.

Description

Technical Field

[0001] The present invention relates to the field of power supply in communication technology, and in particular to a multi-level switching power supply modulation circuit, a switch driving circuit thereof, a control method and an electronic device. Background Art

[0002] In electronic devices, power is required in many occasions, for example, power supply devices for RF power amplifiers. In wireless communication base stations, the efficiency of RF power amplifiers (RFPA) has a decisive influence on the overall power consumption and size of the system. With the development of new generation communication technologies, the peak-to-average ratio (PAR) of signal envelopes and signal bandwidth are getting higher and higher. The traditional fixed voltage power supply solution has good efficiency only when the amplifier is fully loaded. The efficiency of the amplifier often drops a lot when the power is backed off, and the overall average efficiency is very low. At this time, the power supply voltage adjusted in real time according to the signal power / amplitude can greatly improve the overall average efficiency of the amplifier.

[0003] The multi-level switching power supply modulation circuit requires the self-generated loss to be as low as possible. In the existing multi-level switching power supply modulation circuit, since the output voltage switches between various power supply levels, in order to prevent the high level from being poured into the low level, each level needs to be isolated from each other (Block), and most of them use diodes to isolate each level, which will cause large losses in the switching power supply modulation circuit. Summary of the invention

[0004] The invention provides a multi-level switching power supply modulation circuit to reduce the loss of the multi-level switching power supply modulation circuit itself.

[0005] In a first aspect, the present application provides a multi-level switching power supply modulation circuit, the circuit comprising:

[0006] A first switch circuit is respectively connected in series between n-1 input terminals of the N input terminals of the circuit with N input levels and the output terminal of the n-1 input level, the remaining one input terminal of the N input terminals and the output terminal for outputting the input level from the input terminal are equipotential points, and the equipotential point is the last output terminal, wherein the number of the first switch circuits is n-1, and the N input levels are different,

[0007] Second switch circuits are respectively connected in series on the branches connected to the output terminals in sequence, wherein the number of the second switch circuits is n-1, the first output terminal connected to the first second switch circuit is connected to the load, and the second switch circuit connected to the last output terminal is the last second switch circuit,

[0008] a first driving circuit for driving each of the first switch circuits respectively, and

[0009] a second driving circuit for driving each second switch circuit respectively;

[0010] in,

[0011] The last second driving circuit for driving the last second switch circuit is provided with a driving voltage of the last second driving circuit by an auxiliary power supply, and when the input level outputted by the last output terminal is outputted to the load, the auxiliary power supply provides the driving voltage of each driving circuit to each driving circuit,

[0012] The N is a natural number greater than 1.

[0013] Preferably, for any input level outputted from a non-last output terminal or an input level outputted from a non-first output terminal, when the input level is sequentially outputted to a load through a path formed by the input terminal of the input level, the first switch circuit, and the second switch circuits sequentially connected from the output terminal of the input level to the first output terminal, the first switch circuit and each second switch circuit in the path are all in an on state, and the first switch circuit and / or the second switch circuit in the non-path are all in an off state.

[0014] For the input level outputted by the last output terminal, when the input level is outputted to the load through a path formed by the input terminal of the input level, the last output terminal, and the second switch circuits sequentially connected from the last output terminal to the first output terminal, the second switch circuits in the path are all in the on state, and the first switch circuits in the non-path are all in the off state.

[0015] For the input level output by the first output terminal, when the input level is output to the load through the path formed by the input terminal of the input level, the first switching circuit, and the first output terminal in sequence, the first switching circuit in the path is in the on state, and the first switching circuit and / or the second switching circuit in the non-path are both in the off state.

[0016] Preferably, for any input level outputted from a non-last output terminal or an input level outputted from a non-first output terminal, when the input level is sequentially outputted to a load through a path formed by the input terminal of the input level, a first switch circuit, and a second switch circuit sequentially connected from the output terminal of the input level to the first output terminal, the first switch circuit and the second switch circuit in the path are both in an on state, and the first switch circuit in the non-path is in an off state, the second switch circuit in the non-path connected to the output terminal of the input level is in an off state, and the remaining second switch circuits in the non-path except the second switch circuit in an off state are in an on state, so that the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and a driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in an on state in the non-path.

[0017] For the input level outputted by the last output terminal, when the input level is outputted to the load through a path formed by the input terminal of the input level, the last output terminal, and the second switch circuit connected in sequence from the last output terminal to the first output terminal, the first switch circuit and the second switch circuit in the path are both in the on state, and the first switch circuits in the non-path are both in the off state.

[0018] For the input level output by the first output terminal, when the input level is output to the load through the path formed by the input terminal of the input level, the first switch circuit, and the first output terminal in sequence, the first switch circuit in the path is in an on state, the first switch circuit in the non-path is in an off state, the second switch circuit in the non-path connected to the output terminal of the input level is in an off state, and the remaining second switch circuits in the non-path except the second switch circuit in the off state are in an on state, so that the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the non-path that is in an on state.

[0019] Preferably, the driving circuit comprises: a first branch for providing power to the driving circuit, and a second branch for providing a driving voltage.

[0020] The input end of the driving circuit is connected to a control circuit for controlling the switching circuit to be turned on and off.

[0021] The driving port of the driving circuit is connected to the driven port of the switch circuit.

[0022] The first branch is connected in series between the auxiliary power supply and the input end of the bootstrap port of the driving circuit.

[0023] The second branch is connected in parallel with the bootstrap port of the driving circuit.

[0024] Preferably, the switch circuit is a semiconductor switch tube.

[0025] The first branch includes a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port; or, the first branches of the remaining drive circuits in the drive circuit except the last second drive circuit include a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port, and the first branch of the last second drive circuit directly connects the auxiliary power supply to the input end of the bootstrap port of the drive circuit;

[0026] The second branch includes at least a first bootstrap capacitor circuit, which is connected to the bootstrap port; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a first bootstrap capacitor circuit, which is connected to the bootstrap port, and the second branch of the last second drive circuit includes at least a first decoupling capacitor circuit, which is connected to the bootstrap port.

[0027] Preferably, the semiconductor switch tube is an N-type field effect tube, the gate of the field effect tube is connected to the output end of the driving circuit, and the source of the field effect tube is connected to the output end of the bootstrap port of the driving circuit.

[0028] The drain of the semiconductor switch tube in the first switch circuit is connected to the input terminal, and the source is connected to the output terminal of the input level.

[0029] The drain of the semiconductor switch tube in the second switch circuit is connected to the output end of the current input level, and the source is connected to the output end of the next input level.

[0030] Preferably, the first branch also includes a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port; the first branches of the remaining drive circuits in the drive circuit except the last second drive circuit also include a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port, and the first branch of the last second drive circuit connects the auxiliary power supply to the input end of the bootstrap port of the drive circuit via the first current limiting resistor circuit.

[0031] Preferably, the second branch also includes a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit, and the second branch of the last second drive circuit also includes a second current limiting resistor circuit, which is connected in series with the first decoupling capacitor circuit.

[0032] Preferably, the driving circuit further comprises a third branch for providing a driving voltage, wherein the third branch is connected in series with a third current limiting resistor circuit and a second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch;

[0033] or,

[0034] The remaining driving circuits in the driving circuit except the last second driving circuit also include a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch. The last second driving circuit also includes a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second decoupling capacitor circuit and then connected in parallel with the second branch, or the second decoupling capacitor circuit is connected in parallel with the second branch.

[0035] Preferably, the N input terminals are arranged from high to low according to the input levels, the input terminal with the highest input level is the first input terminal, and the input terminal with the lowest input level is the last input terminal, and the input level output by the last input terminal is output to the load according to the set time, so that the auxiliary power supply provides a driving voltage to each driving circuit;

[0036] When N is equal to 2, the input level of each input terminal is not at 0 level.

[0037] A second aspect of the present application provides a driving circuit for driving a switch circuit, the driving circuit comprising:

[0038] a first driving circuit for driving each of the first switch circuits respectively, and

[0039] a second driving circuit for driving each second switch circuit respectively;

[0040] in,

[0041] Each first switch circuit is connected in series between n-1 input terminals of the N input terminals of the circuit with N input levels and the output terminal of the n-1 input level. The remaining one input terminal of the N input terminals and the output terminal for inputting the input terminal with the input level are equipotential points, and the equipotential point is the last output terminal. The number of the first switch circuits is n-1, and the N input levels are different.

[0042] Each second switch circuit is sequentially connected in series between the output terminals. The number of the second switch circuits is n-1. The first output terminal connected to the first second switch circuit is connected to the load. The second switch circuit connected to the last output terminal is the last second switch circuit.

[0043] The last second driving circuit for driving the last second switch circuit is provided with a driving voltage of the last second driving circuit by an auxiliary power supply, and when the input level outputted by the last output terminal is outputted to the load, the auxiliary power supply provides the driving voltage of each driving circuit to each driving circuit,

[0044] The N is a natural number greater than 1.

[0045] Preferably, when the input level outputted by any non-last output terminal or the input level outputted by any non-first output terminal is outputted to the load via its path, the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and a driving circuit of the first switch circuit connected to the output terminal to which the second switch circuit in the non-path is connected and in a conducting state,

[0046] When the input level output by the first output terminal is output to the load through its path, the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and to the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the non-path that is in the on state.

[0047] Preferably, the driving circuit comprises: a first branch for providing power to the driving circuit, and a second branch for providing a driving voltage.

[0048] The input end of the driving circuit is connected to a control circuit for controlling the switching circuit to be turned on and off.

[0049] The driving port of the driving circuit is connected to the driven port of the switch circuit.

[0050] The first branch is connected in series between the auxiliary power supply and the input end of the bootstrap port of the driving circuit.

[0051] The second branch is connected in parallel with the bootstrap port of the driving circuit.

[0052] Preferably, the first branch includes a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port, or the first branches of the remaining drive circuits in the drive circuit except the last second drive circuit include a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port, and the first branch of the last second drive circuit directly connects the auxiliary power supply to the input end of the bootstrap port of the drive circuit;

[0053] The second branch includes at least a first bootstrap capacitor circuit, which is connected in parallel to the bootstrap port; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a first bootstrap capacitor circuit, which is connected to the bootstrap port, and the second branch of the last second drive circuit includes at least a first decoupling capacitor circuit, which is connected to the bootstrap port.

[0054] Preferably, the first branch further comprises a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port; or,

[0055] The first branch of the remaining driving circuits in the driving circuit except the last second driving circuit also includes a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port. The first branch of the last second driving circuit connects the auxiliary power supply to the input end of the bootstrap port of the driving circuit through the first current limiting resistor circuit.

[0056] Preferably, the second branch also includes a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit, and the second branch of the last second drive circuit also includes a second current limiting resistor circuit, which is connected in series with the first decoupling capacitor circuit.

[0057] Preferably, the driving circuit further comprises a third branch for providing a driving voltage, wherein the third branch is connected in series with a third current limiting resistor circuit and a second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch;

[0058] or,

[0059] The remaining driving circuits in the driving circuit except the last second driving circuit also include a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch. The last second driving circuit also includes a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second decoupling capacitor circuit and then connected in parallel with the second branch, or the second decoupling capacitor circuit is connected in parallel with the second branch.

[0060] A third aspect of the present application provides a control method for a switch circuit in a multi-level switch power modulation circuit, the control method being used to control a switch circuit in any of the multi-level switch power modulation circuits, the control method comprising:

[0061] For any input level outputted from a non-last output terminal or a non-first output terminal, the first switch circuit and the second switch circuit on a path formed by the input level being sequentially outputted to the load through the input terminal of the input level, the first switch circuit, and the second switch circuit sequentially connected from the output terminal of the input level to the first output terminal are controlled to be turned on, and the first switch circuit and / or the second switch circuit in the non-path are both turned off.

[0062] For the input level outputted by the last output terminal, the input level is controlled to be outputted to the load through the first switch circuit and each second switch circuit on the path formed by the input terminal, the output terminal, and the second switch circuits connected in sequence from the output terminal to the first output terminal of the input level in sequence, and the first switch circuits in the non-path are all in the off state.

[0063] For the input level output by the first output terminal, the input level is controlled to be in an on state through the input terminal of the input level, the first switch circuit, the first output terminal to the load to form a path, and the first switch circuit and / or the second switch circuit in the non-path are both in an off state.

[0064] Preferably, the control method further comprises:

[0065] According to the set cycle, the input level output at the very end is controlled to be output to the first switch circuit on the path formed by the input end, the output end, and the second switch circuit connected in sequence from the output end to the first output end of the input level to the load, and each second switch circuit is turned on once.

[0066] A fourth aspect of the present application provides a control method for a switch circuit in a multi-level switch power modulation circuit, the control method being used to control a switch circuit in any of the multi-level switch power modulation circuits, the control method comprising:

[0067] For any input level outputted from a non-last output terminal or a non-first output terminal, the input level is controlled to be sequentially outputted to the load through the input terminal of the input level, the first switch circuit, and the second switch circuit sequentially connected from the output terminal of the input level to the first output terminal, so that the first switch circuit and the second switch circuit are turned on, each first switch circuit in the non-path is turned off, the second switch circuit connected to the output terminal of the input level in the non-path is turned off, and the remaining second switch circuits in the non-path except the second switch circuit in the turned-off state are turned on, so that the auxiliary power supply provides a driving voltage to the second switch circuit in the non-path and the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the turned-on state in the non-path,

[0068] For the input level outputted by the last output terminal, the input level is controlled to be outputted to the load through the first switch circuit and each second switch circuit on the path formed by the input terminal, the output terminal, and the second switch circuits connected in sequence from the last output terminal to the first output terminal of the input level in sequence, and the first switch circuits in the non-path are all in the off state,

[0069] For the input level output by the first output terminal, the input level is controlled to be in an on state through the input terminal of the input level, the first switch circuit, and the first switch circuit on the path formed by the first output terminal to the load in sequence, the first switch circuit in the non-path is in an off state, the second switch circuit in the non-path connected to the output terminal of the input level is in an off state, and the remaining second switch circuits in the non-path except the second switch circuit in the off state are in an on state, so that the auxiliary power supply provides a driving voltage to the second switch circuit in the non-path and the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the non-path in an on state.

[0070] Preferably, the control method further comprises:

[0071] According to the set cycle, the input level output at the very end is controlled to be output to the first switch circuit on the path formed by the input end, the output end, and the second switch circuit connected in sequence from the output end to the first output end of the input level to the load, and each second switch circuit is turned on once.

[0072] In a fifth aspect, the present application provides a control device for a switching circuit in a multi-level power supply modulation circuit, the control device comprising a memory and a processor, the memory storing a computer program, the processor being configured to execute the computer program to implement any step of the control method for a switching circuit in a multi-level switching power supply modulation circuit.

[0073] A sixth aspect of the present application provides an electronic device including a multi-level power modulation circuit, wherein the device includes a switch circuit in any of the multi-level power modulation circuits described above.

[0074] The multi-level switching power supply modulation circuit provided in the embodiment of the present application has a first switching circuit connected in series between n-1 input terminals of the N input terminals of the N input levels of the circuit and the output terminal of the n-1 input level, and a second switching circuit connected in series on the branches connected to the output terminals in sequence, so that each input level is isolated and a high input level is prevented from being poured into a low input level. The scalability of different input levels is flexible and convenient. Moreover, when the input level outputted from the last output terminal is outputted to the load, the auxiliary power supply provides the driving voltage of each driving circuit to each driving circuit, which greatly simplifies the driving circuit and helps to reduce the loss of the multi-level switching power supply modulation circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 A schematic diagram of a multi-level switching power supply modulation circuit according to an embodiment of the present application.

[0076] Figure 2aA schematic diagram of a switching power supply modulation circuit with three different input levels according to an embodiment of the present application.

[0077] Figure 2b Another schematic diagram of a switching power supply modulation circuit with three different input levels according to an embodiment of the present application.

[0078] Figure 3 Various circuit forms for driving circuits.

[0079] Figure 4 A schematic diagram of charging the first bootstrap capacitor in each driving circuit when the input level V3 is output to the load.

[0080] Figure 5 A schematic diagram of charging the first bootstrap capacitor in each driving circuit when the input level V2 is output to the load.

[0081] Figure 6a A schematic diagram of charging the first bootstrap capacitor in each driving circuit when the input level V1 is output to the load.

[0082] Figure 6b Another schematic diagram of charging the first bootstrap capacitor in each driving circuit when the input level V1 is output to the load.

[0083] Figure 7 A schematic diagram of a voltage waveform.

[0084] Figure 8a A schematic diagram of a switching power supply modulation circuit with four different input levels according to an embodiment of the present application.

[0085] Figure 8b Another schematic diagram of a switching power supply modulation circuit with four different input levels according to an embodiment of the present application.

[0086] Figure 9a A schematic diagram of a switching power supply modulation circuit with N different input levels according to an embodiment of the present application.

[0087] Figure 9b Another schematic diagram of a switching power supply modulation circuit with N different input levels according to an embodiment of the present application.

[0088] Fig.10 The present invention is a flowchart of a method for controlling a switch circuit in a multi-level switch power supply modulation circuit according to an embodiment of the present application.

[0089] Fig.11 A schematic diagram of a control device for a switch circuit in a multi-level switch power supply modulation circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0090] In order to make the objectives, technical means and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings.

[0091] The multi-level switching power supply modulation circuit provided in the embodiment of the present application is designed with a new circuit topology structure.

[0092] See also Figure 1 As shown, Figure 1 A schematic diagram of a multi-level switching power supply modulation circuit according to an embodiment of the present application.

[0093] The circuit includes:

[0094] A first switch circuit is respectively connected in series between n-1 input terminals of the N input terminals of the circuit and the output terminal of the n-1 input level, the remaining one input terminal of the N input terminals and the output terminal for outputting the input level from the input terminal are equipotential points, and the equipotential point is the last output terminal, that is, the input terminal of the input level output by the last output terminal and the output terminal are not connected with the first switch circuit, wherein the number of the first switch circuits is n-1, and the N input levels are different,

[0095] Second switch circuits are respectively connected in series on the branches connected to the output terminals in sequence, wherein the number of the second switch circuits is n-1, the first output terminal connected to the first second switch circuit is connected to the load, and the second switch circuit connected to the last output terminal is the last drive circuit.

[0096] a first driving circuit for driving each of the first switch circuits respectively, and

[0097] a second driving circuit for driving each second switch circuit respectively;

[0098] in,

[0099] The number of first driving circuits is n-1, the number of second driving circuits is n-1,

[0100] The last second driving circuit for driving the last second switch circuit is provided with a driving voltage of the last second driving circuit by an auxiliary power supply, and when the input level output by the last output terminal is output to the load, the auxiliary power supply provides the driving voltage of each driving circuit to each driving circuit,

[0101] The N is a natural number greater than 1.

[0102] Optionally, when N is 2, the input level of each input terminal is not at 0 level.

[0103] In the embodiment of the present application, the current level provided to the load is isolated from the other input levels not input to the load through the first switching circuit, and the second switching circuit forms a loop for providing the driving voltage when the minimum input level is provided to the load, while avoiding the high level from being poured into the low level when the level is switched. While reducing the loss of the multi-level switching power supply modulation circuit itself, the power supply of the driving circuit is simplified, and the scalability of different input levels is flexible and convenient.

[0104] As an example, the multi-level switching power supply modulation circuit provided in the embodiment of the present application can be used to power a power amplifier and is beneficial to improving the overall average efficiency of the power amplifier.

[0105] To facilitate understanding of the present application, the following description will be given using a switching circuit as a field effect transistor. It should be understood that the present application is not limited thereto, and any other form of switching circuit is also applicable.

[0106] See also Figure 2a As shown, Figure 2a A schematic diagram of a switching power supply modulation circuit with three different input levels in an embodiment of the present application. A first switch tube S1 is connected in series between the input terminal 1 of the input level V1 and its output terminal 1, a first switch tube S2 is connected in series between the input terminal 2 of the input level V2 and its output terminal 2, and the input terminal 3 of the input level V3 and its output terminal 3 are equipotential points, that is, the first switch tube is not connected in series. For any first switch tube, the drain of the first switch tube is connected to the input terminal, and the source of the first switch tube is connected to the output terminal; assuming that the output terminal 1 is the first output terminal, a second switch tube S12 is connected in series between the output terminal 1 and the output terminal 2, and a second switch tube S23 is connected in series between the output terminal 2 and the output terminal 3. The switch is the last second switch tube in the second switch tubes connected in sequence from the output terminal 1 to the output terminal 3. For any second switch tube, the drain of the second switch tube is connected to the current output terminal, and the source of the second switch tube is connected to the next output terminal; the output terminal 1 is connected to the load to serve as the power supply terminal of the load.

[0107] Each switch tube is driven by a driving circuit of the switch tube so that the switch drives the switch tube to be turned on or off according to a control signal input by the driving circuit, wherein the driving circuit used to drive the first switch tube is the first driving circuit, and the driving circuit used to drive the second switch tube is the second driving circuit.

[0108] Among the driving circuits, the last second driving circuit for driving the last second switch tube S23 is provided with a driving voltage by the auxiliary power supply, and the driving voltages of the remaining driving circuits are provided by the auxiliary power supply when the input level V3 is provided to the load.

[0109] As an example, any driving circuit at least includes: a bootstrap port for providing a driving voltage, a driving end for driving a switching tube, an input end for inputting a control signal, the bootstrap port is at least connected to a second branch where a first bootstrap capacitor circuit is located, the input end in the bootstrap port is connected to a high potential of an auxiliary power supply (positive pole of the auxiliary power supply), the output end in the bootstrap port is connected to the source of the switching tube, and the driving end is connected to the gate of the switching tube.

[0110] As another example, see Figure 2b As shown, Figure 2b Another schematic diagram of a switching power supply modulation circuit with three different input levels according to an embodiment of the present application. Figure 2a The difference is that the last second driving circuit for driving the last second switch tube S23 can be connected to the input end of the bootstrap port by an auxiliary power supply via a bootstrap diode.

[0111] See also Figure 3 As shown, Figure 3 As another example, in any driving circuit, the auxiliary power supply can be connected to the input end of the bootstrap port through the first branch where the bootstrap diode is located, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode is connected to the input end of the bootstrap port.

[0112] In view of the fact that the low potential of the DC auxiliary power supply in the last second driving circuit and the input end of the input level V3 are equipotential points, the first branch connecting the input end in the bootstrap port and the high potential of the auxiliary power supply (positive pole of the auxiliary power supply) has no reverse current, therefore, the high potential of the auxiliary power supply in the last second driving circuit can be directly connected to the input end in the bootstrap port, as shown in FIG2 , the first branch of the last second driving circuit of the last second switch tube S23 does not include a bootstrap diode, in addition, in view of the fact that the low potential of the DC auxiliary power supply in the last second driving circuit and the input end of the input level V3 are equipotential points, thus, the main function of the capacitor connected to the second branch is decoupling, therefore, the capacitor connected to the second branch is a first decoupling capacitor circuit.

[0113] As another example, in any driving circuit, the first branch further includes a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port.

[0114] As another example, in any driving circuit, the second branch further includes a second current limiting resistor circuit, which is connected to the bootstrap port in series with the first bootstrap capacitor.

[0115] In addition, any driving circuit may also include a third branch, which is connected to the bootstrap port after the second bootstrap capacitor and the third current limiting resistor circuit are connected in series, that is, the second branch and the third branch are connected in parallel, so that the switching power supply modulation circuit can adapt to a wide range of switching frequencies; or, the third branch only includes the second bootstrap capacitor.

[0116] It should be understood that Figure 3 When the driving circuit in various variations is the last second driving circuit, the bootstrap diode may not be included, and C1 is the first decoupling capacitor and C2 is the second decoupling capacitor.

[0117] In view of the fact that the N-type MOS tube has a smaller on-resistance and a higher level of conduction than the P-type MOS tube, the switch tube in the embodiment of the present application is an N-type MOS tube.

[0118] In order to simplify the circuit design and reduce the complexity of the circuit, each driving circuit in the embodiment of the present application adopts the same circuit structure and the same circuit parameters.

[0119] It should be understood that the bootstrap capacitor and resistor shown in the figure are equivalent capacitors and equivalent resistors respectively, and the diode connected between the source and drain of each switch tube is a parasitic diode of the switch tube.

[0120] The following instructions Figure 2a The working principle of the switching power supply modulation circuit shown.

[0121] See also Figure 4 As shown, Figure 4 A schematic diagram of charging the first bootstrap capacitor in each driving circuit when the input level V3 is output to the load. When the output level V3 is required, only S23 and S12 are turned on, S1 and S2 are turned off, V3 is provided to the load through S23 and S12, and the auxiliary source power charges the respective first bootstrap capacitors through the respective bootstrap diodes in the driving circuits except the last second driving circuit. The driving voltage across each first bootstrap capacitor is used for subsequent driving power supply of its respective driving circuit, and can directly provide driving voltage for the driving circuit of S23 (the last second driving circuit).

[0122] See also Figure 5 As shown, Figure 5 This is a schematic diagram of charging the first bootstrap capacitor in each driving circuit when the input level V2 is output to the load. When the output level is required to be V2, only S2 and S12 are turned on, S23 and S1 are turned off, V2 is provided to the load through S2 and S12, and the auxiliary source power supply can only directly provide driving voltage for the driving circuit of S23.

[0123] See also Figure 6a As shown, Figure 6aA schematic diagram of charging the first bootstrap capacitor in each drive circuit when the input level V1 is output to the load. When the output level is required to be V1, only S1 is turned on, S12, S23, and S2 are turned off, V1 is provided to the load through S1, and the auxiliary source power supply can only directly provide the drive voltage for the drive circuit of S23. As another example, see Figure 6b As shown, Figure 6b Another schematic diagram of charging the first bootstrap capacitor in each driving circuit when the input level V1 is output to the load. When the output level is required to be V1, S1 and S23 are turned on, S12 and S2 are turned off, and the auxiliary source power supply charges the first bootstrap capacitor in all driving circuits except the driving circuit of S1 and the last second driving circuit, and directly provides driving voltage for the driving circuit of S23.

[0124] Table 1 shows the switching states required for the desired output voltage of the switching power supply modulation circuit with three different input levels.

[0125] Vout S1(Vgs1) S12(Vgs12) S2(Vgs2) S23(Vgs23) V1 H L L H V2 L H H L V3 L H L H

[0126] See also Figure 7 As shown, Figure 7 A schematic diagram of a voltage waveform.

[0127] In view of the fact that when V3 is provided to the load, the auxiliary power supply can charge the first bootstrap capacitor in all driving circuits, in order to maintain the stability of the voltage across the bootstrap capacitor, V3 can be controlled to be provided to the load once every set time, that is, S23 and S12 are controlled to be turned on and S1 and S2 are turned off once every set time. The set time and the duration of the conduction of S23 and S12 can be determined according to the capacitance of the first bootstrap capacitor, the driving voltage threshold of the driving circuit, and the operating current of the switch tube.

[0128] See also Figure 8a As shown, Figure 8a It is a schematic diagram of a switching power supply modulation circuit with four different input levels in an embodiment of the present application. A first switch tube S1 is connected in series between the input terminal 1 of the input level V1 and its output terminal 1, a first switch tube S2 is connected in series between the input terminal 2 of the input level V2 and its output terminal 2, a first switch tube S3 is connected in series between the input terminal 3 of the input level V3 and its output terminal 3, and an input terminal 4 of the input level V4 and its output terminal 4 are equipotential points, that is, the first switch is not connected in series, assuming that the output terminal 1 is the first output terminal and the output terminal 4 is the last output terminal, a second switch tube S12 is connected in series between the output terminal 1 and the output terminal 2, a second switch tube S23 is connected in series between the output terminal 2 and the output terminal 3, and a second switch tube S34 is connected in series between the output terminal 3 and the output terminal 4. The switch tube is the last second switch tube in the second switch tubes connected in sequence from the output terminal 1 to the output terminal 3, and the output terminal 1 is connected to the load to serve as the power supply end of the load.

[0129] See also Figure 8b As shown, Figure 8b A schematic diagram of a switching power supply modulation circuit with four different input levels according to an embodiment of the present application. Figure 8a The difference is that the last second driving circuit for driving the last second switch tube S34 can be directly connected to the input end of the bootstrap port by the auxiliary power supply.

[0130] See also Figure 9a As shown, Figure 9a 1 is a schematic diagram of a switching power supply modulation circuit with N different input levels in an embodiment of the present application. A first switch tube S1 is connected in series between the input terminal 1 of the input level V1 and its output terminal 1, a first switch tube S2 is connected in series between the input terminal 2 of the input level V2 and its output terminal 2, a first switch tube S3 is connected in series between the input terminal 3 of the input level V3 and its output terminal 3, and so on. N-1 A first switch tube S is connected in series between the input terminal N-1 and the output terminal N-1 of N-1 , input level V N The input terminal N and the output terminal N are at the same potential point, that is, the first switch is not connected in series;

[0131] Assume that output terminal 1 is the first output terminal, output terminal N is the last output terminal, a second switch tube S12 is connected in series between output terminal 1 and output terminal 2, a second switch tube S23 is connected in series between output terminal 2 and output terminal 3, a second switch tube S34 is connected in series between output terminal 3 and output terminal 4, and so on. A second switch tube S34 is connected in series between output terminal N-1 and output terminal N. (N-1)N The switch tube is the last second switch tube among the second switch tubes connected in sequence from the output terminal 1 to the output terminal N, and the output terminal 1 is connected to the load to serve as the power supply terminal of the load.

[0132] Wherein, N is a natural number greater than 1.

[0133] When the input level V N When the load needs to be supplied, the second switch tubes connected in sequence from output terminal N to output terminal 1 are all turned on, and all the first switch tubes are turned off. The input level V N The auxiliary power supply charges the bootstrap capacitors in all the driving circuits through a path formed by the second switch tubes connected in sequence from the output terminal N to the output terminal 1 to the load level.

[0134] When the input level V1 needs to be provided to the load, as an example, the first switch tube S1 is turned on, and the second switch tubes connected in sequence from the output terminal N to the output terminal 1 are all turned off, that is, all the second switch tubes are turned off, and the remaining first switch tubes except the first switch tube S1 are all turned off, and the input level V1 provides the level to the load through the path formed by the first switch tube, and the auxiliary power supply only charges the bootstrap capacitor in the last drive circuit; as another example, the first switch tube S1 is turned on, the remaining first switches are turned off, the second switch tube S12 connected to the output terminal 1 is turned off, and the remaining second switch tubes except the second switch tube S12 are all turned on, the input level V1 provides the level to the load through the first switch tube, and the auxiliary power supply charges the bootstrap capacitor in the remaining drive circuits except the drive circuit of the first switch tube S1, that is, the bootstrap capacitor in the drive circuit of the first switch tubes and all the second switch tubes except the first switch tube S1 is charged.

[0135] When the input level is V N , and any input level Vn other than the input level V1 needs to be provided to the load, as an example, the first switch tube Sn between the input terminal n and the output terminal n is turned on, and the other first switch tubes are turned off, and the second switch tubes connected from the output terminal n to the output terminal 1 are turned on, and the other second switch tubes are turned off, and the input level V N The path formed by the first switch tube Sn and the second switch tubes connected in sequence from the output terminal n to the output terminal 1 provides a level to the load, and the auxiliary power supply only charges the bootstrap capacitor in the last driving circuit; as another example, the first switch tube Sn between the input terminal n and the output terminal n is turned on, and the other first switch tubes are turned off. Except for the second switch tube connected to the output terminal n and the output terminal n+1, the other second switch tubes are turned on, and the input level Vn is sequentially connected from the output terminal n to the output terminal 1. The second switch tubes are all turned on, and the input level V N The path formed by the first switch tube Sn and the second switch tubes connected in sequence from the output terminal n to the output terminal 1 provides a level to the load, and the auxiliary power supply charges the bootstrap capacitor in the drive circuit of the following switch tubes:

[0136] A first switch tube S connected between the input terminal n+1 and the output terminal n+1 n+1 Until the first switch tube S connected between the input terminal N-1 and the output terminal N-1 N-1 , a total of Nn-1 first switch tubes, and

[0137] Second switch tubes connected sequentially from output terminal n to output terminal N, a total of Nn second switch tubes;

[0138] That is to say, the auxiliary power supply charges the bootstrap capacitor in the driving circuit of the second switch tube that is only in the off state in the non-path, the second switch tubes that are in the on state (i.e., the second switch tubes in the non-path), and the first switch tube connected to the output end to which the second switch tubes in the on state in the non-path are connected.

[0139] See also Figure 9b As shown, Figure 9b A schematic diagram of a switching power supply modulation circuit with four different input levels according to an embodiment of the present application. Figure 9a The difference is that the last second driving circuit for driving the last second switch tube S34 can be directly connected to the input end of the bootstrap port by the auxiliary power supply. It should be understood that the last second driving circuit may include a bootstrap diode or may not include a bootstrap diode, and the capacitor can be understood as a decoupling capacitor.

[0140] As an example, in order to make the circuit structure clear, the input terminals and output terminals of each input level can be arranged according to the input level, for example, arranged from high to low, with the output terminal of the highest input level as the first output terminal and the output terminal of the lowest input level as the last output terminal. As an example, when N is 2, the lowest input level is not 0 level.

[0141] See also Fig.10 As shown, Fig.10 This is a flow chart of a control method for a switch circuit in a multi-level switch power supply modulation circuit according to an embodiment of the present application. The control method includes:

[0142] For the input level V1 output by the first output terminal, for example, output terminal 1, the input level is controlled to be in an on state through the input terminal of the input level, the first switch circuit, and the first switch circuit on the path formed from the first output terminal to the load in sequence, and the remaining first switch circuits and all second switch circuits are in an off state; as another example, the input level is controlled to be in an on state through the input terminal of the input level, the first switch circuit, and the first switch circuit on the path formed from the first output terminal to the load in sequence, the second switch tube connected to the first output terminal is turned off, and the remaining second switch tubes are all turned on, so that the auxiliary power supply charges the bootstrap capacitor in the remaining driving circuits except the driving circuit of the first switch tube in the on state.

[0143] For the input level V output at the final output N, controlling the input level to be output to the first switch circuit on the path formed by the input end, the output end, and the second switch circuits connected in sequence from the output end to the first output end of the input level to the load in sequence, and all the second switch circuits are turned on, and the remaining first switches are all in the off state, so that the auxiliary power supply can charge the bootstrap capacitors in all the driving circuits.

[0144] For any input level Vn except the input level outputted by the last output terminal and the input level outputted by the first output terminal, the input level is controlled to be turned on through the input terminal of the input level, the first switch circuit, and the second switch circuits connected in sequence from the output terminal of the input level to the first output terminal to form a path formed by outputting the first switch circuit on the load, and each second switch circuit, and the rest of the first switch circuits and the second switch circuits are turned on; as another example, the input level is controlled to be turned on through the input terminal of the input level, the first switch circuit, and the second switch circuits connected in sequence from the output terminal of the input level to the first output terminal to form a path formed by outputting the first switch circuit on the load, and the rest of the first switch tubes are turned off, and the rest of the second switch tubes are turned on except the second switch tube connected to the output terminal n and the output terminal n+1 connected to the input level, so that the auxiliary power supply charges the bootstrap capacitor in the driving circuit of the following switch tubes:

[0145] A first switch tube S connected between the input terminal n+1 and the output terminal n+1 n+1 Until the first switch tube S connected between the input terminal N-1 and the output terminal N-1 N-1 , a total of Nn-1 first switch tubes; and

[0146] The second switch tubes connected sequentially from output terminal n to output terminal N are Nn second switch tubes in total.

[0147] The control method of this embodiment enables the driving voltage of the driving circuit to maintain stability while reducing losses, and simplifies the circuit topology structure of the driving circuit.

[0148] See also Fig.11 As shown, Fig.11 This is a schematic diagram of a control device for a switch circuit in a multi-level switching power supply modulation circuit according to an embodiment of the present application. The control device includes a memory and a processor. The memory stores a computer program, and the processor is configured to execute the computer program to implement the steps of the above-mentioned control method.

[0149] The memory may include a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0150] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0151] An embodiment of the present invention further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above control method are implemented.

[0152] As for the apparatus / network-side device / storage medium embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0153] In this article, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0154] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-level switching power supply modulation circuit, It is characterized in that The circuit includes: A first switch circuit is respectively connected in series between n-1 input terminals of the N input terminals of the circuit with N input levels and the output terminal of the n-1 input level, the remaining one input terminal of the N input terminals and the output terminal for outputting the input level from the input terminal are equipotential points, and the equipotential point is the last output terminal, wherein the number of the first switch circuits is n-1, and the N input levels are different, Second switch circuits are respectively connected in series on the branches connected to the output terminals in sequence, wherein the number of the second switch circuits is n-1, the first output terminal connected to the first second switch circuit is connected to the load, and the second switch circuit connected to the last output terminal is the last second switch circuit, a first driving circuit for driving each of the first switch circuits respectively, and a second driving circuit for driving each second switch circuit respectively; in, The last second driving circuit for driving the last second switch circuit is provided with a driving voltage of the last second driving circuit by an auxiliary power supply, and when the input level outputted by the last output terminal is outputted to the load, the auxiliary power supply provides the driving voltage of each driving circuit to each driving circuit, The N is a natural number greater than 1.

2. The multi-level switching power supply modulation circuit according to claim 1, It is characterized in that For any input level outputted from a non-last output terminal or a non-first output terminal, when the input level is sequentially outputted to a load through a path formed by the input terminal of the input level, the first switch circuit, and the second switch circuits sequentially connected from the output terminal of the input level to the first output terminal, the first switch circuit and each second switch circuit in the path are all in an on state, and the first switch circuit and / or the second switch circuit in the non-path are all in an off state. For the input level outputted by the last output terminal, when the input level is outputted to the load through a path formed by the input terminal of the input level, the last output terminal, and the second switch circuits sequentially connected from the last output terminal to the first output terminal, the second switch circuits in the path are all in the on state, and the first switch circuits in the non-path are all in the off state. For the input level output by the first output terminal, when the input level is output to the load through the path formed by the input terminal of the input level, the first switching circuit, and the first output terminal in sequence, the first switching circuit in the path is in the on state, and the first switching circuit and / or the second switching circuit in the non-path are both in the off state.

3. The multi-level switching power supply modulation circuit according to claim 1, It is characterized in that For any input level outputted from a non-last output terminal or an input level outputted from a non-first output terminal, when the input level is sequentially outputted to a load through a path formed by the input terminal of the input level, a first switch circuit, and a second switch circuit sequentially connected from the output terminal of the input level to the first output terminal, the first switch circuit and the second switch circuit in the path are both in an on state, and the first switch circuit in the non-path is in an off state, the second switch circuit in the non-path connected to the output terminal of the input level is in an off state, and the remaining second switch circuits in the non-path except the second switch circuit in an off state are in an on state, so that the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and a driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in an on state in the non-path, For the input level outputted by the last output terminal, when the input level is outputted to the load through a path formed by the input terminal of the input level, the last output terminal, and the second switch circuit connected in sequence from the last output terminal to the first output terminal, the first switch circuit and the second switch circuit in the path are both in the on state, and the first switch circuits in the non-path are both in the off state. For the input level output by the first output terminal, when the input level is output to the load through the path formed by the input terminal of the input level, the first switch circuit, and the first output terminal in sequence, the first switch circuit in the path is in an on state, the first switch circuit in the non-path is in an off state, the second switch circuit in the non-path connected to the output terminal of the input level is in an off state, and the remaining second switch circuits in the non-path except the second switch circuit in the off state are in an on state, so that the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the non-path that is in an on state.

4. The multi-level switching power supply modulation circuit according to claim 1, It is characterized in that The driving circuit comprises: a first branch for providing power to the driving circuit, and a second branch for providing a driving voltage. The input end of the driving circuit is connected to a control circuit for controlling the switching circuit to be turned on and off. The driving port of the driving circuit is connected to the driven port of the switch circuit. The first branch is connected in series between the auxiliary power supply and the input end of the bootstrap port of the driving circuit. The second branch is connected in parallel with the bootstrap port of the driving circuit.

5. The multi-level switching power supply modulation circuit as claimed in claim 4, It is characterized in that The switch circuit is a semiconductor switch tube. The first branch includes a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port; or, the first branches of the remaining drive circuits in the drive circuit except the last second drive circuit include a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port, and the first branch of the last second drive circuit directly connects the auxiliary power supply to the input end of the bootstrap port of the drive circuit; The second branch includes at least a first bootstrap capacitor circuit, which is connected to the bootstrap port; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a first bootstrap capacitor circuit, which is connected to the bootstrap port, and the second branch of the last second drive circuit includes at least a first decoupling capacitor circuit, which is connected to the bootstrap port.

6. The multi-level switching power supply modulation circuit as claimed in claim 5, It is characterized in that The semiconductor switch tube is an N-type field effect tube, the gate of the field effect tube is connected to the output end of the driving circuit, and the source of the field effect tube is connected to the output end of the bootstrap port of the driving circuit. The drain of the semiconductor switch tube in the first switch circuit is connected to the input terminal, and the source is connected to the output terminal of the input level. The drain of the semiconductor switch tube in the second switch circuit is connected to the output end of the current input level, and the source is connected to the output end of the next input level.

7. The multi-level switching power supply modulation circuit as claimed in claim 5, It is characterized in that The first branch further includes a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port; or, The first branch of the remaining driving circuits in the driving circuit except the last second driving circuit also includes a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port. The first branch of the last second driving circuit connects the auxiliary power supply to the input end of the bootstrap port of the driving circuit through the first current limiting resistor circuit.

8. The multi-level switching power supply modulation circuit according to claim 5 or 7, It is characterized in that The second branch also includes a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit, and the second branch of the last second drive circuit also includes a second current limiting resistor circuit, which is connected in series with the first decoupling capacitor circuit.

9. The multi-level switching power supply modulation circuit as claimed in claim 8, It is characterized in that The driving circuit further includes a third branch for providing a driving voltage, wherein the third branch is connected in series with a third current limiting resistor circuit and a second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch; or, The remaining driving circuits in the driving circuit except the last second driving circuit also include a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch. The last second driving circuit also includes a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second decoupling capacitor circuit and then connected in parallel with the second branch, or the second decoupling capacitor circuit is connected in parallel with the second branch.

10. The multi-level switching power supply modulation circuit according to claim 1, It is characterized in that The N input terminals are arranged from high to low according to the input levels, the input terminal with the highest input level is the first input terminal, and the input terminal with the lowest input level is the last input terminal, and the input level output by the last input terminal is output to the load according to the set time, so that the auxiliary power supply provides a driving voltage to each driving circuit; When N is equal to 2, the input level of each input terminal is not at 0 level.

11. A driving circuit for driving a switching circuit, It is characterized in that The driving circuit includes: a first driving circuit for driving each of the first switch circuits respectively, and a second driving circuit for driving each second switch circuit respectively; in, Each first switch circuit is respectively connected in series between n-1 input terminals of the N input terminals of the circuit with N input levels and the output terminal of the n-1 input level, the remaining one input terminal of the N input terminals and the output terminal for outputting the input level from the input terminal are equipotential points, and the equipotential point is the last output terminal. The number of the first switch circuits is n-1, and the N input levels are different. Each second switch circuit is sequentially connected in series between the output terminals. The number of the second switch circuits is n-1. The first output terminal connected to the first second switch circuit is connected to the load. The second switch circuit connected to the last output terminal is the last second switch circuit. The last second driving circuit for driving the last second switch circuit is provided with a driving voltage of the last second driving circuit by an auxiliary power supply, and when the input level output by the last output terminal is output to the load, the auxiliary power supply provides the driving voltage of each driving circuit to each driving circuit, The N is a natural number greater than 1.

12. The driving circuit according to claim 11, It is characterized in that When the input level outputted by any non-last output terminal or the input level outputted by any non-first output terminal is outputted to the load via its path, the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the non-path that is in the on state. When the input level output by the first output terminal is output to the load through its path, the auxiliary power supply provides a driving voltage to each second switch circuit in the non-path and to the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the non-path that is in the on state.

13. The driving circuit according to claim 11, It is characterized in that The driving circuit comprises: a first branch for providing power to the driving circuit, and a second branch for providing a driving voltage. The input end of the driving circuit is connected to a control circuit for controlling the switching circuit to be turned on and off. The driving port of the driving circuit is connected to the driven port of the switch circuit. The first branch is connected in series between the auxiliary power supply and the input end of the bootstrap port of the driving circuit. The second branch is connected in parallel with the bootstrap port of the driving circuit.

14. The driving circuit according to claim 13, It is characterized in that The first branch includes a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port; or, the first branches of the remaining drive circuits in the drive circuit except the last second drive circuit include a bootstrap diode, the anode of the bootstrap diode is connected to the high potential point of the auxiliary power supply, and the cathode of the diode is connected to the input end of the bootstrap port, and the first branch of the last second drive circuit directly connects the auxiliary power supply to the input end of the bootstrap port of the drive circuit; The second branch includes at least a first bootstrap capacitor circuit, which is connected in parallel to the bootstrap port; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a first bootstrap capacitor circuit, which is connected to the bootstrap port, and the second branch of the last second drive circuit includes at least a first decoupling capacitor circuit, which is connected to the bootstrap port.

15. The driving circuit according to claim 14, It is characterized in that The first branch further includes a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port; or, The first branch of the remaining driving circuits in the driving circuit except the last second driving circuit also includes a first current limiting resistor circuit, which is connected in series between the cathode of the bootstrap diode and the input end of the bootstrap port. The first branch of the last second driving circuit connects the auxiliary power supply to the input end of the bootstrap port of the driving circuit through the first current limiting resistor circuit.

16. The driving circuit according to claim 14 or 15, It is characterized in that The second branch also includes a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit; or, the second branches of the remaining drive circuits in the drive circuit except the last second drive circuit include at least a second current limiting resistor circuit, which is connected in series with the first bootstrap capacitor circuit, and the second branch of the last second drive circuit also includes a second current limiting resistor circuit, which is connected in series with the first decoupling capacitor circuit.

17. The driving circuit according to claim 16, It is characterized in that The driving circuit further includes a third branch for providing a driving voltage, wherein the third branch is connected in series with a third current limiting resistor circuit and a second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch; or, The remaining driving circuits in the driving circuit except the last second driving circuit also include a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second bootstrap capacitor circuit and then connected in parallel with the second branch, or the second bootstrap capacitor circuit is connected in parallel with the second branch. The last second driving circuit also includes a third branch for providing a driving voltage, and the third branch is connected in series with the third current limiting resistor circuit and the second decoupling capacitor circuit and then connected in parallel with the second branch, or the second decoupling capacitor circuit is connected in parallel with the second branch.

18. A control method for a switch circuit in a multi-level switching power supply modulation circuit, It is characterized in that The control method is used to control the switch circuit in the multi-level switch power modulation circuit according to any one of claims 1 to 10, and the control method comprises: For any input level outputted from a non-last output terminal or a non-first output terminal, the first switch circuit and the second switch circuit on a path formed by the input level being sequentially outputted to the load through the input terminal of the input level, the first switch circuit, and the second switch circuit sequentially connected from the output terminal of the input level to the first output terminal are controlled to be turned on, and the first switch circuit and / or the second switch circuit in the non-path are both turned off. For the input level outputted by the last output terminal, the input level is controlled to be outputted to the load through the first switch circuit and each second switch circuit on the path formed by the input terminal, the output terminal, and the second switch circuits connected in sequence from the output terminal to the first output terminal of the input level in sequence, and the first switch circuits in the non-path are all in the off state. For the input level output by the first output terminal, the input level is controlled to be in an on state through the input terminal of the input level, the first switch circuit, the first output terminal to the load to form a path, and the first switch circuit and / or the second switch circuit in the non-path are both in an off state.

19. The control method according to claim 18, It is characterized in that The control method further comprises: According to the set cycle, the input level output at the very end is controlled to be output to the first switch circuit on the path formed by the input end, the output end, and the second switch circuit connected in sequence from the output end to the first output end of the input level to the load, and each second switch circuit is turned on once.

20. A control method for a switch circuit in a multi-level switching power supply modulation circuit, It is characterized in that The control method is used to control the switch circuit in the multi-level switch power modulation circuit according to any one of claims 1 to 10, and the control method comprises: For any input level outputted from a non-last output terminal or a non-first output terminal, the input level is controlled to be sequentially outputted to the load through the input terminal of the input level, the first switch circuit, and the second switch circuit sequentially connected from the output terminal of the input level to the first output terminal, so that the first switch circuit and the second switch circuit are turned on, each first switch circuit in the non-path is turned off, the second switch circuit connected to the output terminal of the input level in the non-path is turned off, and the remaining second switch circuits in the non-path except the second switch circuit in the turned-off state are turned on, so that the auxiliary power supply provides a driving voltage to the second switch circuit in the non-path and the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the turned-on state in the non-path, For the input level outputted by the last output terminal, the input level is controlled to be outputted to the load through the first switch circuit and each second switch circuit on the path formed by the input terminal, the output terminal, and the second switch circuits connected in sequence from the last output terminal to the first output terminal of the input level in sequence, and the first switch circuits in the non-path are all in the off state, For the input level output by the first output terminal, the input level is controlled to be in an on state through the input terminal of the input level, the first switch circuit, and the first switch circuit on the path formed by the first output terminal to the load in sequence, the first switch circuit in the non-path is in an off state, the second switch circuit in the non-path connected to the output terminal of the input level is in an off state, and the remaining second switch circuits in the non-path except the second switch circuit in the off state are in an on state, so that the auxiliary power supply provides a driving voltage to the second switch circuit in the non-path and the driving circuit of the first switch circuit connected to the output terminal connected to the second switch circuit in the non-path in an on state.

21. The control method according to claim 20, It is characterized in that The control method further comprises: According to the set cycle, the input level output at the very end is controlled to be output to the first switch circuit on the path formed by the input end, the output end, and the second switch circuit connected in sequence from the output end to the first output end of the input level to the load, and each second switch circuit is turned on once.

22. An electronic device comprising a switch circuit in a multi-level power modulation circuit, It is characterized in that The electronic device comprises a switch circuit in the multi-level power modulation circuit as claimed in any one of claims 1 to 10.

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