CN103618449A - Three-winding coupling inductance double tube boost converter with charge pump - Google Patents

Abstract

The invention relates to a three-winding coupled inductance double-tube boost converter with a charge pump, including a DC power supply, a first boost circuit, a second boost circuit, a first charge pump boost unit, a first clamping circuit, and a second boost circuit. Two clamping circuits, the first switch circuit and the load; the output voltage of the DC power supply is divided into two outputs, one of which is initially boosted by the first boost circuit and then input to the first charge pump boost unit, and then boosted by the first charge pump After the secondary boost of the voltage unit, it is input to one end of the load through the first switch circuit; the other is initially boosted by the second boost circuit and then input to the other end of the load, and an output filter capacitor is connected in parallel at both ends of the load; the first The clamping loop includes a first clamping capacitor and a first clamping diode, and the second clamping loop includes a second clamping capacitor and a second clamping diode. The active network boost converter has a small volume and high conversion efficiency, and the voltage and current stress of the main switch tube is small, and the diode can be turned off naturally with zero current, and there is no reverse recovery problem.

Description

Three-Winding Coupled Inductor Dual Transistor Boost Converter with Charge Pump

technical field

The invention relates to a three-winding coupled inductance double-tube boost converter with a charge pump, belonging to the field of power electronic converters.

Background technique

Under the dual pressure of energy shortage and environmental problems, new energy power generation has received extensive attention and research because of its cleanliness. In order to integrate a single photovoltaic cell and fuel cell into the grid, it is necessary to use a high-gain, high-efficiency DC converter to greatly improve the DC power generation. Voltage level. The boosting capability of the traditional Boost converter is very limited. As the gain increases, the duty cycle gradually increases, the inductor current ripple increases, and the required inductance also increases; and when applied to high output voltage applications, the power The voltage stress and current stress of the switching tube are large, and the conduction loss of the switching tube is large; the voltage stress of the diode on the output side is large, and the diode is hard to turn off, the reverse recovery problem and EMI problem are very serious, and the conversion efficiency is low.

Contents of the invention

The technical problem to be solved by the present invention is to provide a three-winding coupled inductance dual-tube boost converter with a charge pump, which is small in size but high in conversion efficiency. , and the voltage stress and current stress of the main power switch tube are small; the power diodes can realize zero-current natural shutdown, there is no reverse recovery problem, and the EMI interference is small.

The present invention adopts following technical scheme for realizing above-mentioned purpose of the invention:

A three-winding coupled inductance double-transistor boost converter with a charge pump is characterized in that it includes a DC power supply, a first boost circuit, a second boost circuit, a first charge pump boost unit, a first clamping circuit, The second clamping circuit, the first switch circuit and the load; the voltage output by the DC power supply is divided into two outputs, one of which is input to the first charge pump boost unit after being initially boosted by the first boost circuit, and then input to the first charge pump boost unit after being initially boosted by the first boost circuit. The boost unit of the charge pump is boosted twice and input to one end of the load through the first switch circuit; the other is input to the other end of the load after the initial boost of the second boost circuit, and an output filter capacitor is connected in parallel at both ends of the load ; The first boost circuit includes a first inductor and a first switch tube, the second boost circuit includes a second inductor and a second switch tube; the first clamp circuit includes a first clamp capacitor and a first switch tube A clamping diode, the second clamping loop includes a second clamping capacitor and a second clamping diode, one end of the first inductance, the drain of the second switching tube, and one end of the first clamping capacitor are respectively connected to the DC The positive pole of the voltage source, one end of the second inductor, the source pole of the first switch tube, and one end of the second clamping capacitor are respectively connected to the negative pole of the DC voltage source, and the other end of the first clamping capacitor is connected to the cathode of the first clamping diode , the other end of the first inductor and the anode of the first clamping diode are respectively connected to the drain of the first switching tube; the other end of the second clamping capacitor is respectively connected to the anode of the second clamping diode and the other end of the load, The other end of the second inductor and the cathode of the second clamping diode are respectively connected to the source of the second switching tube.

As a further optimization solution of the present invention, the first charge pump boost unit includes a third inductor, a first charge pump diode and a first charge pump capacitor, the first switch circuit is a diode, wherein the first clamp The other end of the capacitor is connected to the anode of the first charge pump diode, the cathode of the first charge pump diode is respectively connected to the anode of the diode and one end of the first charge pump capacitor, the cathode of the diode is connected to one end of the load, and the first charge pump capacitor The other end of the third inductance is connected to one end of the third inductance, and the other end of the third inductance is connected to the positive pole of the input side DC source; the first inductance, the second inductance and the third inductance form a coupled inductance, wherein the first inductance and the input side DC The end connected to the positive pole of the source, the end connected to the positive pole of the DC source on the input side of the third inductor, and the end connected to the source of the second switching tube of the second inductor are the same-named ends of the coupled inductor.

As a further optimization solution of the present invention, the first charge pump boost unit includes a third inductor, a first charge pump diode and a first charge pump capacitor, and the first switch circuit is a diode, wherein the first charge pump The cathode of the diode is respectively connected to the anode of the diode and one end of the first charge pump capacitor, the cathode of the diode is connected to one end of the load, the other end of the first charge pump capacitor is connected to one end of the third inductor, and the other end of the third inductor is respectively It is connected to the cathode of the first clamping diode and the anode of the first charge pump diode; the first inductance, the second inductance and the third inductance form a coupled inductance, wherein the end of the first inductance connected to the anode of the DC source on the input side and the second inductance One end of the three inductors connected to the cathode of the first clamping diode, and one end of the second inductor connected to the source of the second switching tube are terminals with the same name as the coupling inductor.

As a further optimization solution of the present invention, the first and second switch tubes are MOS tubes or IGBT tubes.

The present invention adopts the above-mentioned technical scheme, and has the following beneficial effects: the converter is small in size but high in conversion efficiency, and the voltage stress and current stress of the main power switch tube are low, and the voltage stress of the power diode is low, and can realize zero-current natural shutdown.

Description of drawings

Fig. 1 is the circuit schematic diagram of the three-winding coupled inductance double-tube boost converter with charge pump of the present invention;

Fig. 2 is a circuit schematic diagram of a three-winding coupled inductance dual-tube boost converter with a charge pump according to a second embodiment of the present invention;

Fig. 3 is a voltage waveform diagram of the first power switch tube;

Fig. 4 is a second power switch tube voltage waveform diagram;

5 to 7 are current waveform diagrams of the first inductance, the second inductance and the third inductance;

Fig. 8 is a first power switch tube current waveform diagram;

Fig. 9 is a first power switch tube current waveform diagram;

Fig. 10 is a voltage waveform diagram of the first clamping diode;

Fig. 11 is a first clamping diode current waveform diagram;

Fig. 12 is a voltage waveform diagram of the second clamping diode;

Fig. 13 is a second clamping diode current waveform diagram;

Fig. 14 is a first charge pump diode voltage waveform diagram;

Fig. 15 is a first charge pump diode current waveform diagram;

Figure 16 is a waveform diagram of the diode voltage on the output side;

Figure 17 is a waveform diagram of the diode current at the output side;

Fig. 18 is a waveform diagram of output filter capacitor voltage.

FIG. 19 is a circuit schematic diagram of a three-winding coupled inductance dual-transistor boost converter with a charge pump in the prior art;

Figure 20(a) to Figure 20(n) are the main working waveforms of the three-winding coupled inductor dual-tube boost converter with charge pump;

Figure 21(a) to Figure 21(f) are the equivalent circuit diagrams of a three-winding coupled inductor dual-transistor boost converter with a charge pump.

Explanation of symbols in the figure: V _i is a DC voltage source; N ₁ is the first inductance, N ₂ is the second inductance, S ₁ and S ₂ are the first and second switching tubes, D ₁ and D ₂ are the first and second switching tubes Two clamping diodes, C ₁ and C ₂ are the first and second clamping capacitors, N ₃ is the third inductor, D ₃ is the first charge pump diode, C ₃ is the first charge pump capacitor, D ₄ is the first Switching circuit, C _o is the output filter capacitor, R _L is the load.

Detailed ways

Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

The three-winding coupled inductance double-transistor boost converter with a charge pump as shown in Figure 1 includes a DC power supply, a first boost circuit and a second boost circuit, and the first boost circuit and the second boost circuit The circuit constitutes a double-transistor boosting structure, and also includes a first charge pump boosting unit, a first clamping circuit, a second clamping circuit, a first switching circuit and a load; the output voltage of the DC power supply is divided into two outputs, One of them is initially boosted by the first booster circuit and then input to the first charge pump booster unit, after being boosted twice by the first charge pump booster unit, it is input to one end of the load through the first switch circuit; After the boost circuit initially boosts the voltage, it is input to the other end of the load, and an output filter capacitor is connected in parallel at both ends of the load;

The dual-tube boost structure includes: a DC voltage source Vi, a first inductor N1, a second inductor N2, a first switch tube S1 and a second switch tube S2, the first switch tube is a first power switch tube, and the second switch tube The tube is the second power switch tube; wherein: the drain of the second power switch tube and one end of the first inductance N1 are respectively connected to the positive pole of the DC voltage source Vi, and the other end of the first inductance N1 is connected to the drain of the first power switch tube connection, the source of the first power switch tube and one end of the second inductor N2 are respectively connected to the negative pole of the DC voltage source Vi, and the other end of the second inductor N2 is connected to the source of the second power switch tube.

The first clamping circuit includes: a first clamping capacitor C1 and a second switch circuit, the second switch circuit is a first clamping diode D1; wherein the anode of the first clamping diode D1 is connected to the first power switch S1 The drain is connected to the other end of the first inductor N1, and one end of the first clamping capacitor C1 is connected to the anode of the input-side DC source Vi, the drain of the second power switch tube S1, and one end of the first inductor N1, and the first clamp The other end of the bit capacitor C1 is connected to the cathode of the first clamping diode D1.

The second clamping circuit includes: a second clamping capacitor C2 and a third switch circuit, the third switch circuit is a second clamping diode D2; wherein the cathode of the second clamping diode D2 is connected to the second power switch S2 The source of the second clamping capacitor C2 is connected to the other end of the second inductor N2, and one end of the second clamping capacitor C2 is connected to the cathode of the input-side DC source Vi, the source of the first power switch tube S1, and one end of the second inductor N2. The other end of the clamping capacitor C2 is connected to the anode of the second clamping diode D2.

The first charge pump boost unit includes: a first charge pump capacitor C3, a first charge pump diode D3, and a third inductor N3; the first switch circuit is a diode, wherein the anode of the first charge pump diode D3, the first clamping diode The cathode of D1 is connected to the other end of the first clamping circuit C1, the cathode of the first charge pump diode D3 is respectively connected to the anode of the diode and one end of the first charge pump capacitor C3, the cathode of the diode is connected to one end of the load, and the third One end of the inductor is respectively connected to one end of the first clamping capacitor C1, one end of the first inductor N1, the drain of the second switching transistor S2 and the positive electrode of the power supply. The other end of the first charge pump capacitor is connected to the other end of the third inductor. As shown in FIG. 1 , the third inductor N3 , the first clamping capacitor C1 , the first charge pump diode D3 , and the first charge pump capacitor C3 are connected in series to form a closed loop.

The first inductance N1, the second inductance N2, and the third inductance N3 in the circuit are mutually coupled to form a three-winding coupled inductance, wherein the first inductance N1 is connected to the anode of the input side DC source Vi, and the second inductance N2 is connected to the second power The end connected to the source of the switch tube S2 and the end connected to the anode of the input-side DC source Vi of the third inductor N3 are the three terminals with the same name of the three-winding coupled inductor.

The filter capacitor Co is the output end of the converter, and the load _RL is connected to the output end of the converter in parallel. The output end of the first charge pump step-up unit is connected to one end of the filter capacitor Co through a first switch circuit, and the first open circuit is a diode.

Embodiment 2: As shown in FIG. 2, another specific embodiment of the present invention differs from Embodiment 1 in that: the first charge pump boost unit includes a third inductor, a first charge pump diode and a second A charge pump capacitor, the first switch circuit is a diode, wherein the cathode of the first charge pump diode is respectively connected to the anode of the diode and one end of the first charge pump capacitor, the cathode of the diode is connected to one end of the load, and the first charge The other end of the pump capacitor is connected to one end of the third inductance, and the other end of the third inductance is respectively connected to the cathode of the first clamping diode, the other end of the first clamping capacitor and the anode of the first charge pump diode; An inductance, a second inductance and a third inductance form a coupled inductance, wherein one end of the first inductance is connected to the anode of the DC source on the input side, one end of the third inductance is connected to the cathode of the first clamping diode, and the second inductance is connected to the second The end connected to the source of the switch tube is the same-named end of the coupled inductor.

Figure 3 to Figure 18 are the waveform diagrams when the input voltage V _i =40V, the duty ratio D=0.5 of the power switch tubes S ₁ and S ₂ , the turn ratio of the three-winding coupled inductor is 1:1:3, and the load R=320Ω, where , Figure 3 and Figure 4 are the waveform diagrams corresponding to the first and second power switch tube voltages V _S1 and V _S2 respectively, and Figures 5 to 7 are respectively the waveform diagrams corresponding to the first inductor current iL1 and the second inductor current The waveform diagram corresponding to iL2 and the waveform diagram corresponding to the third inductor current iL3, Figure 8 and Figure 9 are respectively the waveform diagram corresponding to the first power switch tube current is1 and the waveform corresponding to the second power switch tube current is2 Figure 10 and Figure 11 are the waveform diagram corresponding to the first clamping diode voltage VD1 and the waveform diagram corresponding to the current iD1 respectively, and Figure 12 and Figure 13 are respectively the waveform diagram corresponding to the second clamping diode voltage VD2 and The waveform diagram corresponding to the current iD2, Figure 14 and Figure 15 are the waveform diagram corresponding to the first charge pump diode voltage VD3 and the waveform corresponding to the current iD3 respectively, Figure 16 and Figure 17 are the output side diode, that is, the first switching circuit The waveform diagram corresponding to the voltage VD4 and the waveform diagram corresponding to the current iD4, FIG. 18 is the waveform corresponding to the output filter capacitor voltage VC.

It can be seen from the figure that the voltage V _S1 = V _S2 =80V when the power switch tube is turned off, indicating that the voltage stress of the power switch tube is small. The current i _s1 of the first power switch tube and the current i _s2 of the second power switch tube are relatively small, and it can be seen that the current of the power switch tube is small and the conduction loss is small. The diode current is turned off when the current crosses zero, which shows that the problem of diode reverse recovery and EMI interference is effectively solved.

Changing the position of the connection point at one end of the winding _N3 , as shown in Figure 2, another three-winding coupled inductance double-tube boost converter with a charge pump can be obtained. The two circuits are in voltage gain, power switch tube voltage, The current stress, power diode voltage stress, on-state average current and other parameters are completely consistent, and the only difference is in the voltage of the charge pump capacitor.

Converter Topology Analysis

As shown in FIG. 19 , it is a topology diagram of the prior art. Corresponding to FIG. 19 is a three-winding coupled inductor ZVS/ZCS dual-transistor boost converter as shown in FIG. 1 in the present invention. Among them, the switch tubes S1 and S2 work synchronously, the capacitors C1 and C2 are clamping capacitors, which are used to absorb the energy of the leakage inductance of the coupling inductor to clamp the switch tube voltage, and C3 is the charge pump capacitor, which is used to increase the voltage gain of the converter; N1 , N2 and N3 are three mutually coupled windings. Let the turn ratio of L1, L2, and L3 be 1:1:n; since the double-tube structure in the dotted line box in Figure 1 is completely symmetrical, in order to simplify the analysis process, it is assumed that the switching speeds of the switching tubes S1 and S2 are exactly the same; the clamping capacitor is large enough , so that the voltage across the capacitors C1 and C2 is a constant, and the working states of the corresponding devices in the double-tube structure are exactly the same. Figure 20(a) to Figure 20(n) show the main working waveforms of the converter, where Figure 20(a) is the gate drive voltage waveform diagram of the first switch tube and the second switch tube, and Figure 20(b) is The waveform diagram of the excitation current _im of the three-winding coupled inductor, Figure 20(c) is the waveform diagram of the equivalent leakage inductance Lk of the equivalent circuit, Figure 20(d) is the current in1 and in2 of the first inductor and the second inductor Waveform diagram, Figure 20(e) is the waveform diagram of the first clamping capacitor voltage VC1 and the second clamping capacitor voltage VC2, Figure 20(f) is the waveform diagram of the first charge pump capacitor voltage VC3, Figure 20(g) It is the waveform diagram of the first switching tube current i _DS1 and the second switching tube current i _DS2 , and Fig. 20(h) is the waveform diagram of the first switching tube voltage V _DS1 and the second switching tube voltage V _DS2 , Fig. 20(i) is the waveform diagram of the first clamping diode current i _D1 and the second clamping diode current i _D2 , Fig. 20(j) is the waveform diagram of the first clamping diode voltage V _D1 and the second clamping tube voltage V _D2 , Fig. 20(k) is a waveform diagram of the first charge pump diode current i _D3 , Fig. 20(l) is a waveform diagram of the first charge pump diode voltage V _D3 , and Fig. 20(m) is a waveform diagram of the diode current i _D4 , Fig. 20(n) is a waveform diagram of diode voltage V _D4 . Figure 21(a) to Figure 21(f) show the corresponding equivalent circuits. Among them, Figure 21(a) is the equivalent circuit diagram of the mode 1 [t0-t1] stage, Figure 21(b) is the equivalent circuit diagram of the mode 2 [t1-t2] stage, and Figure 21(c) is the mode 3 The equivalent circuit diagram of the [t2-t3] stage, Figure 21(d) is the equivalent circuit diagram of the mode 4[t3-t4] stage, and Figure 21(e) is the equivalent circuit diagram of the mode 5[t4-t5] stage , and Fig. 21(f) is the equivalent circuit diagram of the mode 6 [t5-t6] stage.

1) Mode 1 [t0-t1]. In this stage, the switch tubes S1 and S2 are turned from off to on, and the equivalent circuit is shown in Fig. 21(a). The voltage of the switch tube drops to 0 rapidly, affected by the leakage inductance Lk, the current in1 and in2 reflected to the N1 and N2 windings rise approximately from 0, which helps to reduce the switching loss of the MOS tube, and the diodes D1 and D2 , D3 anti-bias cut-off, D4 conduction. The leakage inductance Lk is discharged by the difference between (Vi+VC2+VC3-Vo) and the input power supply voltage nVi converted to the winding of the coupled inductor N3 until the leakage inductance current iLk drops to zero.

2) Mode 2 [t1-t2]. At this stage, the switch tubes S1 and S2 are still in the conduction state, and the equivalent circuit is shown in Figure 21(b). At time t1, the leakage inductance current iLk is 0, and the diode D4 is naturally turned off, which alleviates the reverse recovery problem well. Then iLk continues to decrease and becomes negative at the beginning, D3 turns into a conduction state, the leakage inductance Lk and the clamp capacitor C1 jointly charge the charge pump capacitor C3, and the current in1 and in2 reflected to the N1 and N2 windings rise linearly, and the output filter Capacitor Co provides energy for the load.

3) Mode 3 [t2-t3]. The equivalent circuit is shown in Fig. 21(c). At t2, the switch tube turns from on to off, and the currents in1 and in2 reflected to the windings of N1 and N2 quickly charge the junction capacitance of S1 and S2 until the voltage of diodes D1 and D2 drops to 0.

4) Mode 4 [t3-t4]. At time t3, diodes D1 and D2 start to conduct, and the equivalent circuit is shown in Figure 21(d). The currents in1 and in2 charge the clamping capacitors C1 and C2 through D1 and D2 respectively. The leakage inductance Lk is charged by the sum of (VC3-VC1) and the voltage nVC1 converted to the coupling inductor N3 winding, until the leakage inductance current iLk rises to 0, and the load energy is still provided by the output filter capacitor Co at this stage.

5) Mode 5 [t4-t5]. The equivalent circuit is shown in Fig. 21(e). At time t4, the leakage inductance current iLk rises to 0, and the diode D3 is naturally turned off, which alleviates the reverse recovery problem. The leakage inductance current iLk rises and continues to rise, and starts to be positive. The diode D4 starts to conduct, and the currents in1 and in2 reflected to the N1 and N2 windings are still positive, and continue to charge C1 and C2. The load side energy is jointly provided by the input power Vi, capacitors C2 and C3.

6) Mode 6 [t5-t6]. The equivalent circuit is shown in Fig. 21(f). At time t5, the winding currents in1 and in2 of N1 and N2 drop to 0, and the diodes D1 and D2 are naturally turned off, which alleviates the problem of reverse recovery. At this stage, the leakage inductance of the coupling inductor will resonate with the junction capacitance of the switch tube, but due to the existence of clamping diodes D1, D2 and clamping capacitors C1, C2, the peak voltage of the MOS tube will be clamped during the resonance process, so it does not Does not increase the voltage stress of the MOS.

Based on the analysis of above circuit, technical effect of the present invention is further illustrated as follows:

1. Due to the large voltage gain (Vo/Vi) of the high-gain DC/DC converter, the input current is large (Ii=Io*Vo/Vi), and the traditional high-gain converter based on the Boost structure (see active clamping and non-active clamping) The first picture of the description of source clamping), when the switch tube S is turned on, the input current flows into the switch tube, the current stress of the switch tube is very large, and the conduction loss is large (P=Irms^2*Rds(on))

2. The traditional high-gain DC/DC converter is based on the BOOST structure, the voltage stress of the switch tube is large, and the on-resistance Rds(on) of the switch tube is positively correlated with the voltage stress. The conduction resistance is very large, and the conduction loss of the switch tube is huge.

3. Although the proposed double-tube structure contains two switch tubes, the current stress of the switch tube is approximately 1/2 of the original, and the voltage stress is approximately 1/2 of the original. Contact instructions 1, 2, can be approximately considered as double-tube The conduction loss of the two switches in the structure is 1/4 of the original Boost structure. High-gain DC/DC converters are often used in photovoltaic power generation applications, and the cost of an additional switch can be ignored compared to the reduced switching loss.

4. The proposed converter can realize the zero-current turn-off of all diodes, which is very helpful for reducing the reverse recovery loss of the diodes and reducing EMI interference.

5. Although the dual-tube structure in the proposed converter has one more inductor than the traditional BOOST structure, it greatly reduces the inductor current. Compared with the traditional BOOST structure, the total volume of the two inductors in the dual-tube structure is larger. it's the same.

Since the actual devices (MOSFET, IGBT, etc.) are not ideal, there are switching losses during the switching process, and high frequency cannot be achieved. Increasing the switching frequency is very important for reducing the value of the inductance, capacitance, and volume of the converter. helpful.

The proposed active clamp converter can realize the zero-voltage turn-on of all four switching tubes, so that the switching loss of the power switching tube is approximately zero, the switching frequency is greatly increased, the volume of the entire converter can be reduced, and the power density can be improved. promote.

It can be seen that the three-winding coupled inductance dual-transistor boost converter with a charge pump in the present invention has a smaller main power switch tube voltage stress and a larger voltage gain, and at the same time, the diode does not have the problem of reverse recovery.

Claims (4)

1. A three-winding coupled inductance dual-transistor boost converter with a charge pump, characterized in that it includes a DC power supply, a first boost circuit, a second boost circuit, a first charge pump boost unit, and a first clamp circuit, the second clamping circuit, the first switch circuit and the load; the voltage output by the DC power supply is divided into two outputs, one of which is initially boosted by the first booster circuit and then input to the first charge pump booster unit. The first charge pump boost unit is boosted twice and input to one end of the load through the first switch circuit; the other is input to the other end of the load after the second boost circuit is initially boosted, and an output is connected in parallel at both ends of the load filter capacitor; the first boost circuit includes a first inductor and a first switch tube, the second boost circuit includes a second inductor and a second switch tube; the first clamp circuit includes a first clamp capacitor and the first clamping diode, the second clamping loop includes a second clamping capacitor and a second clamping diode, one end of the first inductor, the drain of the second switching tube and one end of the first clamping capacitor are respectively connected to to the positive pole of the DC voltage source, one end of the second inductance, the source pole of the first switch tube, and one end of the second clamping capacitor are respectively connected to the negative pole of the DC voltage source, and the other end of the first clamping capacitor is connected to the first clamping diode The other end of the first inductor and the anode of the first clamping diode are respectively connected to the drain of the first switching tube; the other end of the second clamping capacitor is respectively connected to the anode of the second clamping diode and the other end of the load The other end of the second inductor and the cathode of the second clamping diode are respectively connected to the source of the second switching tube. 2. The three-winding coupled inductance double-transistor boost converter with charge pump according to claim 1 is characterized in that: the first charge pump step-up unit comprises a third inductor, a first charge pump diode and The first charge pump capacitor, the first switch circuit is a diode, wherein the other end of the first clamp capacitor is connected to the anode of the first charge pump diode, and the cathode of the first charge pump diode is respectively connected to the anode of the diode and the first One end of the charge pump capacitor is connected, the cathode of the diode is connected to one end of the load, the other end of the first charge pump capacitor is connected to one end of the third inductance, and the other end of the third inductance is connected to the positive pole of the DC source on the input side; the first The inductance, the second inductance and the third inductance form a coupled inductance, wherein the end of the first inductance connected to the positive pole of the input side DC source, the end of the third inductance connected to the positive pole of the input side DC source, and the connection between the second inductance and the second switching tube The end connected to the source is the end of the same name of the coupled inductor. 3. The three-winding coupled inductance double-transistor boost converter with charge pump according to claim 1, characterized in that: said first charge pump boost unit comprises a third inductor, a first charge pump diode and The first charge pump capacitor, the first switch circuit is a diode, wherein the cathode of the first charge pump diode is respectively connected to the anode of the diode and one end of the first charge pump capacitor, the cathode of the diode is connected to one end of the load, the first The other end of the charge pump capacitor is connected to one end of the third inductance, and the other end of the third inductance is respectively connected to the cathode of the first clamping diode and the anode of the first charge pump diode; the first inductance, the second inductance and the first inductance Three inductors form a coupled inductor, wherein the end of the first inductor is connected to the anode of the DC source on the input side, the end of the third inductor is connected to the cathode of the first clamp diode, and the end of the second inductor is connected to the source of the second switching tube. It is the same name end of the coupled inductor. 4. The three-winding coupled inductance double-transistor boost converter with charge pump according to claim 1 or 2, characterized in that: the first and second switch transistors are MOS transistors or IGBT transistors.

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