Conversion device of hybrid active switched inductor and switched capacitor

Abstract

The invention provides a conversion device of a hybrid active switch inductor and a switch capacitor. The conversion device comprises an active switch inductor unit, a switch capacitor unit, an output switch unit and an output capacitor unit, the switched capacitor unit is respectively connected with the active switched inductor unit and the output switch unit, and the output switch unit is also connected with the output capacitor unit; the active switch inductor unit comprises a first switch inductor module and a second switch inductor module, the switch capacitor unit comprises a first switch capacitor module and a second switch capacitor module, the output switch unit comprises a first output switch and a second output switch, and the output capacitor unit comprises a first output capacitor and a second output capacitor; the first switched capacitor module is connected between the output end of the first switched inductor module and the output end of the second output switch, and the second switched capacitor module is connected between the output end of the second switched inductor module and the input end of the first output switch. According to the invention, the voltage gain is improved and the voltage stress is reduced.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a hybrid active switched inductor and switched capacitor conversion device. Background Art

[0002] Direct current to direct current (DC-DC) converters are widely used in new energy occasions such as photovoltaics, energy storage, and fuel cells. However, the voltage levels of photovoltaics, lithium batteries, and fuel cells are relatively low. In order to connect low-voltage electric energy to the high-voltage DC bus, a high-gain DC-DC converter is required to significantly increase the output voltage level of the new energy system. At the same time, the device voltage stress must be maintained at a low level when the output voltage is high.

[0003] At present, the performance of the converter of hybrid active switched inductor and switched capacitor in terms of gain characteristics and device stress is more prominent. This converter achieves high gain and low stress, but this converter will cause resonance between the inductor inside the converter and the parasitic capacitance of the semiconductor switch element, that is, when the values ​​of the two inductors inside the converter are not equal, the switch tube will have obvious unbalanced voltage oscillation, resulting in increased voltage stress of the switch tube. At the same time, the potential difference between the input ground and the output ground of this converter is not constant. The non-constant potential difference will cause electromagnetic interference (EMI) interference problems, thereby reducing the life of the renewable energy system. Summary of the invention

[0004] The present application provides a hybrid active switched inductor and switched capacitor conversion device for preventing voltage oscillation and reducing voltage stress and EMI to increase the life of a renewable energy system.

[0005] The present application provides a hybrid active switching inductor and switching capacitor conversion device, comprising: an active switching inductor unit, a switching capacitor unit, an output switching unit, and an output capacitor unit;

[0006] The switch capacitor unit is connected to the active switch inductor unit and the output switch unit respectively, and the output switch unit is also connected to the output capacitor unit;

[0007] The active switch inductor unit includes: a first switch inductor module and a second switch inductor module connected in parallel, the switch capacitor unit includes a first switch capacitor module and a second switch capacitor module connected in parallel, the output switch unit includes a first output switch and a second output switch, the output capacitor unit includes a first output capacitor and a second output capacitor, and the first output capacitor and the second output capacitor are connected in series between the output end of the first output switch and the input end of the second output switch;

[0008] The first switch capacitor module is connected between the output end of the first switch inductor module and the output end of the second output switch, and the second switch capacitor module is connected between the output end of the second switch inductor module and the input end of the first output switch;

[0009] The first input end of the first switching inductor module is connected between the first output capacitor and the second output capacitor, or the first output capacitor and the second output capacitor are connected to the negative electrode of the input power supply;

[0010] The first switch inductor module, the first switch capacitor module, the second output switch and the second output capacitor form a first clamping circuit, and the second switch inductor module, the second switch capacitor module, the first output switch and the first output capacitor form a second clamping circuit.

[0011] Optionally, the first input end of the first switching inductor module and the first input end of the second switching inductor module are both connected to the negative electrode of the input power supply, and the second input end of the first switching inductor module and the second input end of the second switching inductor module are both connected to the positive electrode of the input power supply;

[0012] The input power supply, the first switch inductor module, the first switch capacitor module, the second output switch, and the second output capacitor form the first clamping circuit.

[0013] Optionally, a load unit is further connected between the output end of the first output switch and the input end of the second output switch.

[0014] Optionally, the first switch capacitor module and the second switch capacitor module each include a plurality of switch capacitors connected in series.

[0015] Optionally, the switched capacitor includes a capacitor and a semiconductor switch element connected in parallel.

[0016] Optionally, the first switch capacitor module includes a second switch capacitor and a third switch capacitor connected in series, and the second switch capacitor module includes a first switch capacitor and a fourth switch capacitor connected in series;

[0017] The first switch capacitor is connected in parallel with the second switch capacitor, and the third switch capacitor is connected in parallel with the fourth switch capacitor.

[0018] Optionally, the first switch inductor module and the second switch inductor module both include a semiconductor switch element and an inductor connected in series.

[0019] Optionally, the capacitances of the first switch capacitor and the second switch capacitor satisfy the following formula (I), and the capacitances of the third switch capacitor and the fourth switch capacitor satisfy the following formula (II);

[0020]

[0021]

[0022] Wherein, C1 is the capacitance value of the first switch capacitor, C2 is the capacitance value of the second switch capacitor, C3 is the capacitance value of the third switch capacitor, C4 is the capacitance value of the fourth switch capacitor, D is the duty cycle of the active switch inductor unit, R o is the resistance value of the load unit connected to the output switch unit, is the voltage ripple ratio of the first switched capacitor, f s is the switching frequency of the active switching inductor unit, is the voltage ripple ratio of the third switched capacitor.

[0023] Optionally, the first output capacitor and the second output capacitor satisfy the following formula (3) and formula (4) respectively;

[0024]

[0025]

[0026] Among them, C o1 is the capacitance value of the first output capacitor, C o2 is the capacitance value of the second output capacitor, D is the duty cycle of the active switch inductor unit, R o is the resistance value of the load unit connected to the output switch unit, is the capacitor voltage ripple ratio of the first output capacitor, is the capacitor voltage ripple ratio of the second output capacitor, f s is the switching frequency of the active switching inductor unit.

[0027] Optionally, the inductance in the first switching inductance module and the inductance in the second switching inductance module satisfy the following formula (V):

[0028]

[0029] Wherein, L1 is the inductance value of the inductor in the first switch inductor module, L2 is the inductance value of the inductor in the second switch inductor module, D is the duty cycle of the active switch inductor unit, R o is the resistance value of the load unit connected to the output switch unit, f sis the switching frequency of the active switching inductor unit, r iL is the inductor current ripple rate of the second switching inductor module.

[0030] In the present application, the hybrid active switch inductor and switch capacitor conversion device includes: an active switch inductor unit, a switch capacitor unit, an output switch unit, and an output capacitor unit; the first switch inductor module, the first switch capacitor module, the second output switch and the second output capacitor form a first clamping circuit, and the second switch inductor module, the second switch capacitor module, the first output switch and the first output capacitor form a second clamping circuit. Compared with the prior art, the present application forms a first clamping circuit and a second clamping circuit by setting two output capacitors and two output switches, thereby preventing the active switch inductor unit from having voltage oscillation phenomenon; and the voltage stress of the output capacitor unit is reduced by two output capacitors, and the voltage stress of the output switch unit is reduced by two output switches, so that the voltage of the first switch capacitor module, the second switch capacitor module, the first output capacitor and the second output capacitor is constant, and the first input end of the first switch inductor module and the second output capacitor and the second output switch are connected at a constant voltage output filter capacitor, so that the potential difference between the first input end of the first switch inductor module and the second output capacitor and the second output switch connection is constant, thereby reducing EMI phenomenon. In addition, the present application also improves the voltage gain and the efficiency of the conversion device through the above circuit structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A logic block diagram of a hybrid active switched inductor and switched capacitor conversion device provided in one embodiment of the present application;

[0033] Figure 2 A logic block diagram of a switched capacitor unit in a hybrid active switched inductor and switched capacitor conversion device provided in one embodiment of the present application;

[0034] Figure 3 A circuit diagram of a hybrid active switched inductor and switched capacitor conversion device provided in one embodiment of the present application;

[0035] Figure 4 A circuit diagram of a switching inductor unit in a hybrid active switching inductor and switching capacitor conversion device provided in one embodiment of the present application;

[0036] Figure 5 A schematic diagram of a circuit in which a switched inductor unit in a hybrid active switched inductor and switched capacitor conversion device provided in one embodiment of the present application stops working;

[0037] Figure 6 A circuit diagram of a first clamping circuit provided in an embodiment of the present application;

[0038] Figure 7 A circuit diagram of a second clamping circuit provided in an embodiment of the present application;

[0039] Figure 8 This is a voltage and current conversion waveform diagram of each electronic component in a hybrid active switched inductor and switched capacitor conversion device provided in one embodiment of the present application.

[0040] In the figure: 1-active switch inductor unit; 2-switch capacitor unit; 3-output switch unit; 4-output capacitor unit; 5-first switch inductor module; 6-second switch inductor module; 7-first switch capacitor module; 8-second switch capacitor module; 9-first output switch; 10-second output switch; 11-first output capacitor; 12-second output capacitor; 13-input power supply; 14-second switch capacitor; 15-third switch capacitor; 16-first switch capacitor; 17-fourth switch capacitor; 18-load unit. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also belong to the scope of protection of the present application. In addition, it should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the absence of conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0042] The definitions of the terms used in this application are as follows:

[0043] A switching inductor refers to an electronic component composed of a switching tube and an inductor. It belongs to a boost unit and has the characteristics of high gain and low voltage stress.

[0044] A switched capacitor is an electronic component consisting of a switch tube and a capacitor. It is a boost unit with the characteristics of high gain and low voltage stress.

[0045] Figure 1A hybrid active switching inductor and switching capacitor conversion device is shown according to an embodiment of the present application. Figure 1 As shown, the device includes: an active switching inductor unit 1, a switching capacitor unit 2, an output switching unit 3, and an output capacitor unit 4;

[0046] The switch capacitor unit 2 is connected to the active switch inductor unit 1 and the output switch unit 3 respectively, and the output switch unit 3 is also connected to the output capacitor unit 4;

[0047] The active switching inductor unit 1 includes: a first switching inductor module 5 and a second switching inductor module 6 connected in parallel, the switching capacitor unit 2 includes a first switching capacitor module 7 and a second switching capacitor module 8 connected in parallel, the output switch unit 3 includes a first output switch 9 and a second output switch 10, and the output capacitor unit 4 includes a first output capacitor 11 and a second output capacitor 12, and the first output capacitor 11 and the second output capacitor 12 are connected in series between the output end of the first output switch 9 and the input end of the second output switch 10;

[0048] The first switch capacitor module 7 is connected between the output end of the first switch inductor module 5 and the output end of the second output switch 10, and the second switch capacitor module 8 is connected between the output end of the second switch inductor module 6 and the input end of the first output switch 9;

[0049] The first input end of the first switch inductor module 5 is connected between the first output capacitor 11 and the second output capacitor 12, or between the first output capacitor 11 and the second output capacitor 12 and the negative electrode of the input power supply 13;

[0050] The first switched inductor module 5 , the first switched capacitor module 7 , the second output switch 10 and the second output capacitor 12 form a first clamping circuit, and the second switched inductor module 6 , the second switched capacitor module 8 , the first output switch 9 and the first output capacitor 11 form a second clamping circuit.

[0051] The first switch inductor module 5 is used to control the transmission of the electric energy of the input power supply 13 to the first switch capacitor module 7 when working, and to receive the electric energy transmitted by the first switch capacitor module 7 when stopping working.

[0052] The second switched inductor module 6 is used to receive the electric energy transmitted by the second switched capacitor module 8 when working, discharge when stopping working, and transmit the electric energy to the second switched capacitor module 8 .

[0053] The positive electrode of the first output capacitor 11 is connected to the output end of the first output switch 9 , the negative electrode of the first output capacitor 11 is connected to the positive electrode of the second output capacitor 12 , and the negative electrode of the second output capacitor 12 is connected to the input end of the second output switch 10 .

[0054] Furthermore, the first input terminal of the first switched inductor module 5 is connected between the negative electrode of the first output capacitor 11 and the positive electrode of the second output capacitor 12 .

[0055] Among them, the first switch capacitor module 7 and the second switch capacitor module 8 receive electric energy from the first switch inductor module 5 and the second switch inductor module 6 when the first switch inductor module 5 and the second switch inductor module 6 are working, and charge the first output capacitor 11 and the second output capacitor 12 when the first switch inductor module 5 and the second switch inductor module 6 stop working.

[0056] When the first switch inductor module 5 and the second switch inductor module 6 are working, the input end of the first output switch 9 receives electric energy from the first switch capacitor module 7 and the second switch capacitor module 8, and the output end of the first output switch 9 receives electric energy from the first output capacitor 11 and the second output capacitor 12. The voltage at the input end is lower than the voltage at the output end, so the first output switch 9 is disconnected.

[0057] The input end of the second output switch 10 receives electric energy discharged from the first output capacitor 11 and the second output capacitor 12, and the output end of the second output switch 10 receives electric energy from the first switch capacitor module 7 and the second switch capacitor module 8. The input end voltage is less than the output end voltage, so the second output switch 10 is disconnected.

[0058] The first output capacitor 11 and the second output capacitor 12 discharge when the first switch inductor module 5 and the second switch inductor module 6 are working, and provide electrical energy to the outside (such as the load unit 18 described below). When the first switch inductor module 5 and the second switch inductor module 6 stop working, they receive electrical energy from the first switch capacitor module 7 and the second switch capacitor module 8.

[0059] Among them, the first input end of the first switching inductor module 5 is connected between the first output capacitor 11 and the second output capacitor 12. When the first output capacitor 11 and the second output capacitor 12 are discharged, the electric energy between the second output capacitor 12 and the first output capacitor 11 is transmitted to the first input end of the first switching inductor module 5.

[0060] The first clamping circuit is used to make the voltage of the first switched capacitor module 7 and the second output capacitor 12 constant, and the second clamping circuit is used to make the voltage of the second switched capacitor module 8 and the first output capacitor 11 constant, thereby making the voltage of the first switched inductor module 5 and the second switched inductor module 6 constant.

[0061] The working process of the above hybrid active switched inductor and switched capacitor conversion device is as follows:

[0062] When the first switch inductor module 5 and the second switch inductor module 6 are working, the input power supply 13 transmits electric energy to the first switch inductor module 5 and the second switch inductor module 6, the first switch inductor module 5 transmits the received electric energy to the first switch capacitor module 7, the first switch capacitor module 7 transmits the electric energy to the second switch capacitor module 8, at this time, the first output switch 9 and the second output switch 10 are disconnected, the second switch capacitor module 8 transmits the electric energy to the output end of the second switch inductor module 6, the first input end of the second switch inductor module 6 receives the electric energy, the first output capacitor 11 and the second output capacitor 12 provide electric energy to the outside (such as the load unit 18 described below), and transmit electric energy to the first switch inductor module 5;

[0063] When the first switch inductor module 5 and the second switch inductor module 6 stop working, the input power supply 13 provides electric energy to the second switch capacitor module 8, the first output switch 9 and the second output switch 10 are turned on, and the second switch capacitor module 8 sends the received electric energy to the first output capacitor 11 and the second output capacitor 12 through the first output switch 9, and then sends the electric energy to the first switch capacitor module 7 through the second output switch 10.

[0064] In this embodiment, the conversion device of hybrid active switched inductor and switched capacitor includes: an active switched inductor unit 1, a switched capacitor unit 2, an output switch unit 3, and an output capacitor unit 4; a first switched inductor module 5, a first switched capacitor module 7, a second output switch 10 and a second output capacitor 12 form a first clamping circuit, and a second switched inductor module 6, a second switched capacitor module 8, a first output switch 9 and a first output capacitor 11 form a second clamping circuit. Compared with the prior art, the present application forms a first clamping circuit and a second clamping circuit by setting two output capacitors and two output switches, thereby preventing the active switch inductor unit 1 from voltage oscillation; and the voltage stress of the output capacitor unit 4 is reduced by two output capacitors, and the voltage stress of the output switch unit 3 is reduced by two output switches, so that the voltage of the first switch capacitor module 7, the second switch capacitor module 8, the first output capacitor 11 and the second output capacitor 12 is constant, and the first input end of the first switch inductor module 5 and the connection between the second output capacitor 12 and the second output switch 10 are output filter capacitors with a constant voltage, so that the potential difference between the first input end of the first switch inductor module 5 and the connection between the second output capacitor 12 and the second output switch 10 is constant, thereby reducing EMI. In addition, the present application also improves the voltage gain and the efficiency of the conversion device through the above circuit structure.

[0065] Optionally, the first input terminal of the first switch inductor module 5 and the first input terminal of the second switch inductor module 6 are both connected to the negative pole of the input power supply 13, and the second input terminal of the first switch inductor module 5 and the second input terminal of the second switch inductor module 6 are both connected to the positive pole of the input power supply 13;

[0066] The input power source 13 , the first switch inductor module 5 , the first switch capacitor module 7 , the second output switch 10 , and the second output capacitor 12 form a first clamping circuit.

[0067] The positive electrode of the input power supply 13 transmits electric energy to the second input end of the first switch inductor module 5 and the second input end of the second switch inductor module 6, and the negative electrode of the input power supply 13 receives electric energy transmitted by the first input end of the first switch inductor module 5 and the first input end of the second switch inductor module 6. The first clamping circuit is used to stabilize the voltage of the first switch inductor module 5, the first switch capacitor module 7, the second output switch 10, and the second output capacitor 12, and prevent the active switch inductor unit 1 from voltage oscillation, thereby reducing the voltage stress of the first switch inductor module 5.

[0068] Optionally, a load unit 18 is further connected between the output end of the first output switch 9 and the input end of the second output switch 10 .

[0069] One end of the load unit 18 is connected to the positive electrode of the first output capacitor 11 , and the other end of the load unit 18 is connected to the negative electrode of the second output capacitor 12 .

[0070] Among them, when the first switch inductor module 5 and the second switch inductor module 6 are working, the load unit 18 receives the discharge voltage of the first output capacitor 11 and the second output capacitor 12; when the first switch inductor module 5 and the second switch inductor module 6 stop working, the load unit 18 receives the discharge voltage of the first switch capacitor module 7 and the second switch capacitor module 8.

[0071] Optionally, the first switch capacitor module 7 and the second switch capacitor module 8 each include a plurality of switch capacitors connected in series.

[0072] Optionally, the switched capacitor includes a capacitor and a semiconductor switch element connected in parallel.

[0073] Optionally, the semiconductor switch element includes at least one of a diode, a metal-oxide-semiconductor field-effect transistor (MOS tube), and an insulated gate bipolar transistor (IGBT). For example, the semiconductor switch element may be a diode.

[0074] The switched capacitor in the first switched capacitor module 7 is connected in parallel with the switched capacitor in the second switched capacitor module 8 .

[0075] The following description is made by taking an example that each switched capacitor module includes two switched capacitors connected in series. Figure 2 As shown, the first switch capacitor module 7 includes a second switch capacitor 14 and a third switch capacitor 15 connected in series, and the second switch capacitor module 8 includes a first switch capacitor 16 and a fourth switch capacitor 17 connected in series;

[0076] The first switch capacitor 16 is connected in parallel with the second switch capacitor 14 , and the third switch capacitor 15 is connected in parallel with the fourth switch capacitor 17 .

[0077] The first switch capacitor 16 is connected to the second switch inductor module 6 , the second switch capacitor 14 is connected to the first switch inductor module 5 , the fourth switch capacitor 17 is connected to the input end of the first output switch 9 , and the third switch capacitor 15 is connected to the output end of the second output switch 10 .

[0078] Among them, each switching capacitor includes a group of parallel capacitors and semiconductor switching elements, the semiconductor switching element of the first switching capacitor 16 is connected to the capacitance of the second switching capacitor 14, the capacitance of the first switching capacitor 16 is connected to the semiconductor switching element of the second switching capacitor 14, the capacitance of the second switching capacitor 14 is also connected to one end of the capacitance of the third switching capacitor 15, the semiconductor switching element of the third switching capacitor 15 is connected to the capacitance of the fourth switching capacitor 17, the capacitance of the third switching capacitor 15 is also connected to the semiconductor switching element of the fourth switching capacitor 17, the capacitance of the fourth switching capacitor 17 is also connected to the first output switch 9, and the semiconductor switching element of the fourth switching capacitor 17 is also connected to the second output switch 10.

[0079] Furthermore, the capacitance of the first switched capacitor 16 is also connected to the second switched inductor module 6 , and the capacitance of the second switched capacitor 14 is also connected to the first switched inductor module 5 .

[0080] When the first switched inductor module 5 and the second switched inductor module 6 are working, the capacitance in the first switched capacitor 16 and the capacitance in the second switched capacitor 14 are discharged, and the capacitance in the third switched capacitor 15 and the capacitance in the fourth switched capacitor 17 are charged. When the first switched inductor module 5 and the second switched inductor module 6 stop working, the capacitance in the first switched capacitor 16 and the capacitance in the second switched capacitor 14 are charged, and the capacitance in the third switched capacitor 15 and the capacitance in the fourth switched capacitor 17 are discharged.

[0081] Among them, when the first switch inductor module 5 and the second switch inductor module 6 are working, the first switch inductor module 5 sends electric energy to the capacitor of the second switch capacitor 14 through the electric energy received from the input power supply 13, and after being transmitted to the capacitor and semiconductor switch element of the third switch capacitor 15, the electric energy is output to the semiconductor switch element of the fourth switch capacitor 17 after passing through the capacitor of the third switch capacitor 15. After the electric energy passes through the semiconductor switch element of the fourth switch capacitor 17, it is combined with the capacitor passing through the fourth switch capacitor 17 and transmitted to the capacitor of the first switch capacitor 16. After passing through the capacitor of the first switch capacitor 16, the electric energy is transmitted to the second switch inductor module 6.

[0082] When the first switch inductor module 5 and the second switch inductor module 6 stop working, the input power supply 13 transmits electric energy to the second switch inductor module 6, and the second switch inductor module 6 transmits the received electric energy to the capacitor and the semiconductor switch element of the first switch capacitor 16. After receiving the electric energy, the capacitor of the first switch capacitor 16 transmits the electric energy to the semiconductor switch element of the second switch capacitor 14 and the capacitor and the semiconductor switch element of the fourth switch capacitor 17. After the semiconductor switch element of the fourth switch capacitor 17 transmits the received electric energy to the first output capacitor 11, the second output capacitor 11 and the load unit 18 respectively, the first output capacitor 11, the second output capacitor 11 and the load unit 18 transmit the electric energy to the second output capacitor 12, and the second output capacitor 12 then transmits the electric energy to the positive electrode of the capacitor in the second switch capacitor 14 through the capacitor of the third switch capacitor 15 and the electric energy of the semiconductor switch element of the second switch capacitor 14. The negative electrode of the capacitor in the second switch capacitor 14 then transmits the electric energy to the first switch inductor module 5, and then transmits it to the negative electrode of the input power supply 13 after passing through the first switch inductor module 5.

[0083] Among them, the capacitance values ​​of the first capacitance of the first switch capacitor 16 and the second capacitance of the second switch capacitor 14 are equal, and satisfy the following formula (I); the capacitance values ​​of the third capacitance of the third switch capacitor 15 and the fourth capacitance of the fourth switch capacitor 17 are equal, and satisfy the following formula (II);

[0084]

[0085]

[0086] Wherein, C1 is the capacitance value of the first capacitor, C2 is the capacitance value of the second capacitor, C3 is the capacitance value of the third capacitor, C4 is the capacitance value of the fourth capacitor, D is the duty cycle of the active switch inductor unit 1, R o is the resistance value of the load unit 18 connected to the output switch unit 3, is the voltage ripple ratio of the first capacitor, f s is the switching frequency of the active switching inductor unit 1, is the voltage ripple ratio of the third capacitor.

[0087] The first output capacitor 11 and the second output capacitor 12 satisfy the following formula (III) and formula (IV) respectively:

[0088]

[0089]

[0090] Among them, C o1 is the capacitance value of the first output capacitor, C o2 is the capacitance value of the second output capacitor, D is the duty cycle of the active switching inductor unit 1, R o is the resistance value of the load unit 18 connected to the output switch unit 3, is the capacitor voltage ripple ratio of the first output capacitor, is the capacitor voltage ripple ratio of the second output capacitor, f s is the switching frequency of the active switching inductor unit 1.

[0091] Optionally, the first switch inductor module 5 and the second switch inductor module 6 both include a semiconductor switch element and an inductor connected in series. The semiconductor switch element includes at least any one of a MOS tube and an IGBT. For example, the semiconductor switch element may be a MOS tube.

[0092] Among them, one end of the semiconductor switch element in the first switch inductor module 5 is respectively connected to the positive electrode of the input power supply and one end of the inductor in the second switch inductor module 6, the other end of the semiconductor switch element in the first switch inductor module 5 is respectively connected to one end of the inductor of the first switch inductor module 5 and the capacitance of the second switch capacitor 14, the other end of the inductor of the first switch inductor module 5 is connected to one end of the semiconductor switch element of the second switch inductor module 6, and the other end of the inductor of the second switch inductor module 6 is respectively connected to the other end of the semiconductor switch element and the capacitance of the first switch capacitor 16.

[0093] When the semiconductor switch element of the first switch inductor module 5 and the semiconductor switch element of the second switch inductor module 6 are turned on, the inductance of the first switch inductor module 5 and the inductance of the second switch inductor module 6 are charged, and when the semiconductor switch element of the first switch inductor module 5 and the semiconductor switch element of the second switch inductor module 6 are turned off, the inductance of the first switch inductor module 5 and the inductance of the second switch inductor module 6 are discharged.

[0094] The inductance in the first switch inductance module 5 and the inductance in the second switch inductance module 6 satisfy the following formula (V):

[0095]

[0096] Wherein, L2 is the inductance value of the inductor in the first switch inductor module, L1 is the inductance value of the inductor in the second switch inductor module, D is the duty cycle of the active switch inductor unit 1, R o is the resistance value of the load unit 18 connected to the output switch unit 3, f s is the switching frequency of the active switching inductor unit 1, r iL is the inductor current ripple rate of the second switching inductor module 6 .

[0097] Optionally, the first output switch 9 at least includes: any one of a diode, a MOS tube, and an optocoupler switch.

[0098] Optionally, the second output switch 10 includes at least any one of a diode, a MOS transistor, and an optocoupler switch.

[0099] The first output switch 9 may be a diode, and the second output switch 10 may be a diode. The first clamping circuit and the second clamping circuit are implemented by adopting a dual output diode structure, thereby reducing the voltage stress of the output diode and reducing the overall loss of the output diode.

[0100] Optionally, the first output switch 9 and the second output switch 10 are Schottky diodes.

[0101] Since the first switch inductor module 5 and the second switch inductor module 6 of the conversion device in the present application need to be continuously closed and opened during operation, by setting the output switch to a Schottky diode, the characteristic of the Schottky diode having no reverse recovery loss can be utilized, thereby reducing the consumption of the first output switch 9 and the second output switch 10, while reducing the device cost.

[0102] Exemplarily, the first output switch 9 and the second output switch 10 are diodes, the semiconductor switch unit in the switch capacitor is a diode, and the semiconductor switch unit of the first switch inductor module 5 and the second switch inductor module 6 is a MOS tube.

[0103] like Figure 3 As shown, the first switch inductor module 5 includes a first MOS transistor S1 and a second inductor L2 connected in series, and the second switch inductor module 6 includes a second MOS transistor S2 and a first inductor L1 connected in series.

[0104] Among them, the first input end of the first switch inductor module 5 is one end of the second inductor L2, the second input end of the first switch inductor module 5 is the source of the first MOS tube S1, and the output end of the first switch inductor module 5 is located between the drain of S1 and the other end of the second inductor L2; the second input end of the second switch inductor module 6 is one end of the first inductor L1, the first input end is the drain of the second MOS tube S2, and the output end is located between the first inductor L1 and the source of the second MOS tube S2. The first switch capacitor 16 includes a first capacitor C1 and a first diode D1 connected in parallel, the second switch capacitor 14 includes a second capacitor C2 and a second diode D2 connected in parallel, the third switch capacitor 15 includes a third capacitor C3 and a third diode D3 connected in parallel, and the fourth switch capacitor 17 includes a fourth capacitor C4 and a fourth diode D4 connected in parallel.

[0105] The first output switch 9 is a first output diode D o1 , the second output switch 10 is a second output diode D o2 The output end of the first output switch 9 is the first output diode D o1 The negative electrode of the first output switch 9 is the negative electrode of the first output diode D o1 The positive electrode of the second output switch 10 is the positive electrode of the second output diode D o2 The output end of the second output switch 10 is the positive electrode of the second output diode D o2 of the negative electrode.

[0106] The first output capacitor 11 is a first output capacitor C o1 , the second output capacitor 12 is the second output capacitor C o2 The input power is V in , the load unit is R o .

[0107] Among them, the positive electrode of C1 is connected to one end of L1 and the positive electrode of D1 respectively, the negative electrode of C1 is connected to the positive electrode of D2, the negative electrode of C4 and the negative electrode of D4 respectively, the positive electrode of C2 is connected to the negative electrode of D1, the positive electrode of C3 and the positive electrode of D3, the negative electrode of C2 is connected to one end of L2 and the negative electrode of D2, the positive electrode of C3 is also connected to the negative electrode of D1 and the positive electrode of D3, the negative electrode of C3 is connected to the positive electrode of D4 and the positive electrode of D o2 The negative pole of C4 is connected to the negative pole of D3 and D o1 The positive electrode of C4 is connected to the positive electrode of D2 and the negative electrode of D4.

[0108] Among them, the source of S1 is connected to one end of L1 and V in The positive electrode of S1 is connected to the drain of L2 and the negative electrode of C2, the source of S2 is connected to the other end of L1 and the positive electrode of C1, and the drain of S2 is connected to one end of L2 and V innegative connection.

[0109] Among them, Figure 4 As shown, when S1 and S2 are closed, D1, D2, D o1 and D o2 Both are off, D3 and D4 are on, V in L1 and L2 are charged, while C1 and C2 are discharged, so that V in Together with C1 and C2, C3 and C4 are charged. o1 and D o2 Cut-off, so C o1 and C o2 discharge to R o Provide electrical energy.

[0110] like Figure 5 As shown, when S1 and S2 are disconnected, D3 and D4 are cut off, and D1, D2, D o1 and D o2 Both are turned on, L1 and L2 are discharged, V in , L1 and L2 charge C1 and C2, C3 and C4 discharge, and the energy discharged by C3 and C4 is transferred to C o1 and C o2 Charge and send to R o Provide electrical energy.

[0111] Among them, Figure 6 As shown, when V in When the positive electrode outputs electrical energy, it passes through the source of S1 and then outputs from the drain of S1 to C2, and then inputs the positive electrode from the negative electrode of C2 and outputs from the positive electrode to the negative electrode of C3. o2 The negative electrode is transferred to the positive electrode and then output to C o2 The negative electrode, through C o2 The positive output to V in , thereby forming a clamping circuit of S1, that is, the first clamping circuit.

[0112] Among them, Figure 7 As shown, the source of S2 will output the electric energy to the positive electrode of C1, and then flow from the negative electrode of C1 to the negative electrode of C4, and the positive electrode of C4 flows to D o1 The positive terminal and the o1 Negative output to C o1 The positive electrode, then from C o1 The negative electrode of S2 flows out to the drain of S2, thereby forming a clamping circuit of S2, that is, the second clamping circuit.

[0113] In the present application, the voltage oscillation caused by the resonance between the inductor and the parasitic capacitance of the MOS tube is effectively suppressed by providing the above two clamping circuits.

[0114] The following is an explanation of the selection of inductance:

[0115] When the first MOS tube S1 is turned on, the following formulas (1)-(3) are obtained according to Kirchhoff's voltage law:

[0116]

[0117] V L =V in (2)

[0118]

[0119] When the first MOS tube S1 is disconnected, the following formulas (4)-(8) are obtained according to Kirchhoff's voltage law:

[0120]

[0121]

[0122]

[0123]

[0124]

[0125] in, is the voltage of the third capacitor C3; is the voltage of the first capacitor C1; is the voltage of the second capacitor C2; is the voltage of the third capacitor C3; V in is the voltage of the input power supply 13; V L is the inductor voltage (the voltage of the first inductor or the second inductor); is the voltage of the first output capacitor 11; is the voltage of the second output capacitor 12.

[0126] Further, according to the volt-second balance principle, the volt-second balance expression (9) is listed for the first inductor L1 and the second inductor L2:

[0127]

[0128] Among them, t1 is the moment when the first MOS transistor S1 and the second MOS transistor S2 are turned from closed to open; t0 is the moment when the first MOS transistor S1 and the second MOS transistor S2 are turned from open to closed; t2 is the moment when the first MOS transistor S1 and the second MOS transistor S2 are turned from closed to open; T is the working period of the first inductor and the second inductor.

[0129] Further calculation of expression (9) yields formula (10).

[0130]

[0131] DT s The time to charge the inductor; (1-D)T s is the time period for the first inductor and the second inductor to discharge.

[0132] Further calculation of formula (10) is performed by dividing both sides by V in , and the voltage gain expression (11) is obtained.

[0133]

[0134] Among them, G CCM is the voltage gain; V O is the load unit R o The voltage across both ends.

[0135] It can be seen from this that the voltage gain of the present application is higher than 4 / (1-D) in the prior art.

[0136] In this embodiment, the current ripple rate of the second inductor L2 is the same as the current ripple rate of the first inductor L1. The formula (12) of the inductor current ripple rate is:

[0137]

[0138] Among them, i L，avg is the average current of the second inductor L2, Δi L is the current ripple of the first inductor L1.

[0139] Furthermore, Δi L It is determined by dividing the inductor voltage by the inductor value and multiplying it by time, that is, formula (13).

[0140]

[0141] According to the working characteristics of the capacitor, that is, in one cycle, the average current of the capacitor is 0, the first diode D1, the second diode D2, the first diode D3, the second diode D4, the first output diode D o1 and the second output diode D o2 The average current of the diodes included is the output current I o , we can get expression (14).

[0142]

[0143] in, is the average current of the first diode D1; is the average current of the second diode D2; is the average current of the third diode D3; is the average current of the fourth diode D4; The first output diode D o1 The average current of The second output diode D o2 The average current, I o is the load unit R o of current.

[0144] When the first MOS transistor S1 and the second MOS transistor S2 are turned on, the third diode D3 and the fourth diode D4 are forward-conducted, and their conduction time in one cycle is DT. s , so that the average current of the third diode D3, the fourth diode D4, the first MOS transistor S1 and the second MOS transistor S2 is as follows: Formula (15)-(18).

[0145]

[0146]

[0147]

[0148]

[0149] in, is the average current of the first capacitor C1 when the first MOS transistor S1 and the second MOS transistor S2 are turned on; is the average current of the second capacitor C2 when the first MOS transistor S1 and the second MOS transistor S2 are turned on; is the average current of the third capacitor C3 when the first MOS transistor S1 and the second MOS transistor S2 are turned on; is the average current of the fourth capacitor C4 when the first MOS transistor S1 and the second MOS transistor S2 are turned on; is the average current of the third diode D3 when the first MOS transistor S1 and the second MOS transistor S2 are turned on; is the average current of the fourth diode D4 when the first MOS transistor S1 and the second MOS transistor S2 are turned on; The first output capacitor C o1 The average current when the first MOS transistor S1 and the second MOS transistor S2 are turned on; The second output capacitor C o2 The average current when the first MOS transistor S1 and the second MOS transistor S2 are turned on.

[0150] When the first MOS transistor S1 and the second MOS transistor S2 are disconnected, the first diode D1 and the second diode D2 are forward-conducted, and the first output diode Do1 and the second output diode D o2 It is also forward conducting, and its conduction time in one cycle is (1-D)T s , the average currents of the first diode D1, the second diode D2, the first MOS transistor S1 and the second MOS transistor S2 are obtained as follows: Formulas (19)-(22).

[0151]

[0152]

[0153]

[0154]

[0155] in, is the average current of the first capacitor C1 when the first MOS transistor S1 and the second MOS transistor S2 are disconnected; is the average current of the second capacitor C2 when the first MOS transistor S1 and the second MOS transistor S2 are disconnected; is the average current of the third capacitor C3 when the first MOS transistor S1 and the second MOS transistor S2 are disconnected; is the average current of the fourth capacitor C4 when the first MOS transistor S1 and the second MOS transistor S2 are disconnected; is the average current of the first diode D1 when the first MOS transistor S1 and the second MOS transistor S2 are disconnected; is the average current of the second diode D2 when the first MOS transistor S1 and the second MOS transistor S2 are disconnected; The first output capacitor C o1 The average current when the first MOS transistor S1 and the second MOS transistor S2 are disconnected; The second output capacitor C o2 The average current when the first MOS transistor S1 and the second MOS transistor S2 are disconnected.

[0156] Further, according to Kirchhoff's voltage law, the first diode D1, the second diode D2 and the first output diode D o1 Add the currents and we get formula (23).

[0157]

[0158] in, is the average current of the inductor.

[0159] Formula (24) can be obtained by taking the reciprocal of the period as the frequency.

[0160]

[0161] Formula (25) is obtained according to formulas (11), (13) and (24).

[0162]

[0163] Formula (26) is obtained based on formulas (24), (13), (11) and (25).

[0164]

[0165] Therefore, according to the above formula (26), the inductance values ​​of the first inductor and the second inductor can be obtained.

[0166] The following is an explanation of the selection of capacitors in switched capacitors:

[0167] The voltage ripple expression of each capacitor in the first switch capacitor 16 and the second switch capacitor 14 is determined according to the voltage ripple approximation expression (27) of the capacitor.

[0168]

[0169] According to formulas (15)-(18) and (19)-(22), the average current of the first capacitor C1 is According to the 2I of the molecule o By calculation, the voltage ripple of the first capacitor C1 is obtained as formula (28).

[0170]

[0171] in, is the voltage ripple of the first capacitor C1.

[0172] The average current of the third capacitor C3 is According to the molecular I o By calculation, the voltage ripple of the third capacitor C3 is obtained as formula (29).

[0173]

[0174] Wherein, C3 is the capacitance value of the third capacitor, is the voltage ripple of the third capacitor C3.

[0175] Among them, the capacitance values ​​of the first capacitor C1 and the second capacitor C2 are the same. According to formula (28), it can be obtained that the voltage ripples of the first capacitor C1 and the second capacitor C2 are equal.

[0176] The capacitance values ​​of the third capacitor C3 and the fourth capacitor C4 are the same. According to formula (29), it can be obtained that the voltage ripples of the third capacitor C3 and the fourth capacitor C4 are equal.

[0177] When the first MOS transistor S1 and the second MOS transistor S2 are turned on, the first capacitor C1 and the second capacitor C2 are discharged, and the input power supply V in , the first capacitor C1 and the second capacitor C2 charge the third capacitor C3 and the fourth capacitor C4, and the first output capacitor C o1 and the second output capacitor C o2 Discharge to load unit R o , thus obtaining the input power supply V in The voltage relationship among the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 is as follows: formula (30)-(32).

[0178]

[0179]

[0180]

[0181] When the first MOS transistor S1 and the second MOS transistor S2 are disconnected, the first capacitor C1 and the second capacitor C2 are charged, and the second capacitor C2 and the fourth capacitor C4 charge the first output capacitor C o1 and the second output capacitor C o2 Charging and simultaneously charging the load unit R o Provide electrical energy, according to Kirchhoff's voltage law, get the input power V in The voltage relationship among the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 is as follows: formula (33)-(34).

[0182]

[0183]

[0184] Based on formula (33) and formula (34), formula (35)-(37) are further obtained.

[0185]

[0186]

[0187]

[0188] According to formula (11), formula (31)-(32) and formula (35)-(37), the formulas of each capacitor in the first switch capacitor 16 and the second switch capacitor 14 are obtained as (38) and (39):

[0189]

[0190]

[0191] According to the definition of capacitor voltage ripple ratio (40) and formulas (38) and (39), expressions (41) and (42) of the capacitance values ​​of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are obtained.

[0192]

[0193]

[0194]

[0195] Therefore, according to the above formulas (41) and (42), the capacitance values ​​of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 can be obtained.

[0196] The following is an explanation of the selection of output capacitors:

[0197] According to formula (11), formula (31)-(32) and formula (35)-(37), the formulas for the voltages of the first output capacitor 11 and the second output capacitor 12 are (43) and (44).

[0198]

[0199]

[0200] According to formulas (43), (44) and the definition of capacitor voltage ripple ratio (40), expressions (45) and (46) of the capacitor value are obtained.

[0201]

[0202]

[0203] Therefore, according to the above formulas (45) and (46), the first output capacitor V Co1 , the second output capacitor V Co2 Capacitance value.

[0204] The following is an explanation of why the MOS tube and the inductor in the clamping circuit of the present application do not experience voltage oscillation.

[0205] Among them, refer to Figure 6 and Figure 7 , the drain-source voltage V of the first MOS tube S1 and the second MOS tube S2 DS The expressions (47) and (48) are:

[0206]

[0207]

[0208] Among them, V DS1 is the drain-source voltage of the first MOS tube S1, V DS2 is the drain-source voltage of the second MOS transistor S2.

[0209] It can be deduced from Kirchhoff's voltage law that no matter whether the inductance values ​​L1 and L2 are equal, when the first MOS transistor S1 and the second MOS transistor S2 are turned on and off, the voltages across the first inductor L1 and the second inductor L2 are expressed by formula (49) and formula (50).

[0210]

[0211]

[0212]

[0213]

[0214] According to the volt-second balance principle, it can be further derived into formula (53) and formula (54):

[0215]

[0216]

[0217] Formula (53) and formula (54) are further simplified to obtain formula (55).

[0218]

[0219] Therefore, the voltage across the inductor and the parasitic capacitance of the MOS tube is given by formula (56), formula (57), formula (58) and formula (59).

[0220]

[0221]

[0222] V L1 =V in -V Coss1 (58)

[0223] V L2 =V in -V Coss2 (59)

[0224] Among them, V Coss1 is the voltage of the parasitic capacitance of the first MOS tube S1, V Coss2 is the voltage of the parasitic capacitance of the second MOS tube S2.

[0225] Since capacitors C1, C2, C3, C4, C o1 , C o2 The voltage of the inductor and the parasitic capacitor of the MOS tube is constant, so the voltage of the inductor and the parasitic capacitor of the MOS tube is also kept constant, so the inductor and the parasitic capacitor of the MOS tube will not resonate, and there will be no voltage oscillation on the first MOS tube S1 and the second MOS tube S2.

[0226] See also Figure 8 When the first MOS tube S1 and the second MOS tube S2 are turned on, that is, during the period [t0-t1], the first inductor L1 and the second inductor L2 are connected by the input power supply V in The voltages on the first inductor L1 and the second inductor L2 are equal to the input voltage. Therefore, the current i L1 and the current i of the second inductor L2 L2 Expression (60) is:

[0227]

[0228] Among them, i L (t0) is i L The value at time t0.

[0229] During [t0-t1], the first diode D1 and the second diode D2 are in the cut-off state, and the third diode D3 and the fourth diode D4 are in the on state, so that the first capacitor C1 and the second capacitor C2 are discharged, and the input power supply V in The first capacitor C1 and the second capacitor C2 together charge the third capacitor C3 and the fourth capacitor C4. At the same time, the first output diode D o1 and the second output diode D o2 In the cut-off state, the first output capacitor C o1 and the second output capacitor C o2 The energy stored in is released to the load unit R o , so the voltage relationship between capacitors C1, C2, C3, and C4 is shown in formulas (30)-(32).

[0230] When the first MOS transistor S1 and the second MOS transistor S2 are disconnected, that is, during the period [t1-t2], the first inductor L1 and the second inductor L2 enter the discharge state at the same time, and the current expression of the first inductor L1 and the second inductor L2 is (61):

[0231]

[0232] Among them, i L (t1) is i L The value at time t1.

[0233] During the period [t1-t2], the first diode D1, the second diode D2, and the first output diode D o1 and the second output diode D o2 The third diode D3 and the fourth diode D4 are in the on state, so the first capacitor C1 and the second capacitor C2 are charged, and the third capacitor C3 and the fourth capacitor C4 are discharged, so that the first output capacitor C o1 and the second output capacitor C o2 The third capacitor C3 and the fourth capacitor C4 are charged, and a portion of the electric energy of the third capacitor C3 and the fourth capacitor C4 is also provided to the load unit R o According to Kirchhoff's voltage law, the voltage relationship among capacitors C1, C2, C3, and C4 can be obtained as shown in (33)-(37).

[0234] At the same time, the volt-second balance expression of the inductor (62) is:

[0235]

[0236] According to the above formula, during [t0-t1], the inductor voltage is equal to V in , during [t1-t2], the inductor voltage is equal to Therefore, in one cycle, the inductor voltage V L With input voltage V in and load cell R o The voltage relationship expressions (63) and (64) are:

[0237] V in =V in t∈[t0-t1] (63)

[0238]

[0239] According to gain formula (11) and formula (38), formula (38), formula (43), formula (44), the first MOS transistor S1, the second MOS transistor S2 and the first output capacitor C o1 and the second output capacitor C o2 The voltage stress is given by formula (65) and formula (66).

[0240]

[0241]

[0242] Therefore, the voltage stress of the first MOS transistor S1 and the second MOS transistor S2 is Compared with the voltage stress of the switch tube in the prior art Smaller.

[0243] Finally, it should be noted that all contents not described in the technical solution of this application can be implemented using existing technologies. In addition, the above embodiments are only used to illustrate the technical solution of this application, rather than to limit it; although the application is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A hybrid active switched inductor and switched capacitor conversion device, characterized in that: It includes: an active switch inductor unit, a switch capacitor unit, an output switch unit, and an output capacitor unit; The switch capacitor unit is connected to the active switch inductor unit and the output switch unit respectively, and the output switch unit is also connected to the output capacitor unit; The active switch inductor unit includes: a first switch inductor module and a second switch inductor module connected in parallel, the switch capacitor unit includes a first switch capacitor module and a second switch capacitor module connected in parallel, the output switch unit includes a first output switch and a second output switch, the output capacitor unit includes a first output capacitor and a second output capacitor, and the first output capacitor and the second output capacitor are connected in series between the output end of the first output switch and the input end of the second output switch; The first switch capacitor module is connected between the output end of the first switch inductor module and the output end of the second output switch, and the second switch capacitor module is connected between the output end of the second switch inductor module and the input end of the first output switch; The first input end of the first switching inductor module is connected between the first output capacitor and the second output capacitor, or the first output capacitor and the second output capacitor are connected to the negative electrode of the input power supply; The first switch inductor module, the first switch capacitor module, the second output switch and the second output capacitor form a first clamping circuit, and the second switch inductor module, the second switch capacitor module, the first output switch and the first output capacitor form a second clamping circuit.

2. The conversion device according to claim 1, characterized in that The first input end of the first switch inductor module and the first input end of the second switch inductor module are both connected to the negative electrode of the input power supply, and the second input end of the first switch inductor module and the second input end of the second switch inductor module are both connected to the positive electrode of the input power supply; The input power supply, the first switch inductor module, the first switch capacitor module, the second output switch, and the second output capacitor form the first clamping circuit.

3. The conversion device according to claim 1, characterized in that: A load unit is also connected between the output end of the first output switch and the input end of the second output switch.

4. The conversion device according to claim 1, characterized in that The first switch capacitor module and the second switch capacitor module each include a plurality of switch capacitors connected in series.

5. The conversion device according to claim 4, characterized in that: The switch capacitor includes a capacitor and a semiconductor switch element connected in parallel.

6. The conversion device according to claim 4, characterized in that: The first switch capacitor module includes a second switch capacitor and a third switch capacitor connected in series, and the second switch capacitor module includes a first switch capacitor and a fourth switch capacitor connected in series; The first switch capacitor is connected in parallel with the second switch capacitor, and the third switch capacitor is connected in parallel with the fourth switch capacitor.

7. The conversion device according to any one of claims 1 to 6, characterized in that: The first switch inductor module and the second switch inductor module both include a semiconductor switch element and an inductor connected in series.

8. The conversion device according to claim 6, characterized in that: The capacitances of the first switch capacitor and the second switch capacitor satisfy the following formula (I), and the capacitances of the third switch capacitor and the fourth switch capacitor satisfy the following formula (II); Wherein, C1 is the capacitance value of the first switch capacitor, C2 is the capacitance value of the second switch capacitor, C3 is the capacitance value of the third switch capacitor, C4 is the capacitance value of the fourth switch capacitor, D is the duty cycle of the active switch inductor unit, R o is the resistance value of the load unit connected to the output switch unit, is the voltage ripple ratio of the first switched capacitor, f s is the switching frequency of the active switching inductor unit, is the voltage ripple ratio of the third switched capacitor.

9. The conversion device according to any one of claims 1 to 6, characterized in that: The first output capacitor and the second output capacitor satisfy the following formula (3) and formula (4) respectively; Among them, C o1 is the capacitance value of the first output capacitor, C o2 is the capacitance value of the second output capacitor, D is the duty cycle of the active switch inductor unit, R o is the resistance value of the load unit connected to the output switch unit, is the capacitor voltage ripple ratio of the first output capacitor, is the capacitor voltage ripple ratio of the second output capacitor, f s is the switching frequency of the active switching inductor unit.

10. The conversion device according to claim 7, characterized in that: The inductance in the first switch inductance module and the inductance in the second switch inductance module satisfy the following formula (V); Wherein, L1 is the inductance value of the inductor in the first switch inductor module, L2 is the inductance value of the inductor in the second switch inductor module, D is the duty cycle of the active switch inductor unit, R o is the resistance value of the load unit connected to the output switch unit, f s is the switching frequency of the active switching inductor unit, r iL is the inductor current ripple rate of the second switching inductor module.

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