Reverse magnetic winding dc / dc converter with active double switched capacitor coupling structure

Abstract

This invention relates to an active dual-switched capacitor coupled DC / DC converter with a reverse magnetic winding, belonging to the field of optics. It solves the problem that existing DC converters cannot simultaneously achieve low turns ratios and high voltage gain. The invention combines inductors, capacitors, diodes, and coupled inductors (N1, N2) in a specific series-cross connection to form an integrated high-gain unit. Through a reverse-coupled inductor voltage multiplier circuit (composed of multi-winding coupled inductors N1 and N2 connected in reverse, diode D1, and capacitor C1) and an active dual-switched capacitor structure (composed of power switches S1 and S2, capacitor C2, and diodes D2 and D3), the proposed converter can generate high voltage gain at low turns ratios. This invention is primarily applied in high boost ratio DC power conversion applications.

Description

Technical Field

[0001] This invention belongs to the technical field of power electronic converters. Background Technology

[0002] Current DC-DC converter technology employs two switches, one coupling inductor, and two capacitors. When both switches are simultaneously on, the input source and capacitor are connected in parallel to store energy in the inductor; when they are off, these components are connected in series to discharge, achieving voltage boost. While this approach achieves continuous input current, it has a fundamental limitation: voltage gain is strongly positively correlated with the turns ratio of the coupling inductor. To obtain high output voltage (e.g., boosting 40V to 400V), the turns ratio must be designed to be very high (typically N>3 or even higher). However, a high turns ratio naturally leads to high leakage inductance, the need for high-voltage components, and high switching stress. Therefore, current DC-DC converters cannot simultaneously achieve both low turns ratio and high voltage gain, a problem that urgently needs to be addressed. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that existing DC-DC converters cannot simultaneously achieve low turns ratio and high voltage gain. This invention provides a DC / DC converter with an active dual-switched capacitor coupling structure and a reverse magnetic winding.

[0004] An active dual-switched capacitor coupled DC / DC converter with a reverse magnetic winding, including a DC voltage source V in Diodes D1 to D3, Output diode D o Capacitors C1 to C2, output capacitor C o The components include multi-winding coupled inductors N1 to N2, power switches S1 and S2, and a load resistor R. The turns ratio of multi-winding coupled inductor N2 to multi-winding coupled inductor N1 is... ,and Power switches S1 and S2 are controlled synchronously.

[0005] DC voltage source V in The positive terminal is connected to one end of capacitor C1 and the same terminal of multi-winding coupled inductor N1 simultaneously.

[0006] The other end of capacitor C1 is connected to the same terminal of multi-winding coupled inductor N2;

[0007] The anode of diode D1, the opposite terminal of multi-winding coupled inductor N1, and the drain of power switch S2 are connected simultaneously.

[0008] The opposite terminals of the multi-winding coupled inductor N2, the anode of diode D3, and the output diode D o The anode and the cathode of diode D1 are connected simultaneously;

[0009] The source of power switch S2 is connected to one end of capacitor C2 and the anode of diode D2 simultaneously;

[0010] The cathode of diode D3 is connected to the other end of capacitor C2 and the drain of power switch S1 simultaneously.

[0011] Output diode D o Cathode and output capacitor C o One end of the resistor is connected to one end of the load resistor R simultaneously;

[0012] Output capacitor C o The other end, the other end of the load resistor R, the source of power switch S1, the cathode of diode D2, and the DC voltage source V in The negative terminals are all connected to the power supply ground.

[0013] Preferably, the switching period of both power switches is T. s T s Divided into four time periods by five times from t1 to t5, namely time periods [t1, t2], (t2, t3], (t3, t4], and (t4, t5], the converter includes four switching modes, specifically:

[0014] In switching mode 1, during the time period [t1, t2], power switches S1 and S2 are turned on. According to the magnetic coupling theory, the overall magnetized inductance L formed by the multi-winding coupled inductors N1 and N2 is... M and leakage inductance L k Capacitor C1 is charged through diode D1, and diodes D2, D3, and output diode D... o It does not conduct electricity under reverse voltage, while the output capacitor C o Independently supplying power to the load resistor R;

[0015] In switching mode 2, during the time period (t2, t3], power switches S1 and S2 are turned off, and the DC voltage source V... in The overall leakage inductance L formed by the multi-winding coupled inductors N1 and N2 k and magnetizing inductor L M The parasitic capacitance of power switch S2 is charged, and capacitor C2 charges the parasitic capacitance of power switch S1. At time t3, both power switches S1 and S2 are not connected. Diodes D2, D3, and output diode D... o Conductive;

[0016] In switching mode 3, during the time period (t3, t4), power switches S1 and S2 are turned off, and the DC voltage source V... in When capacitor C1 is charged, the DC voltage source V in The multi-winding coupled inductor N2 and capacitor C1 charge capacitor C2 through diode D3, while the DC voltage source V... in The multi-winding coupled inductor N2 and capacitor C1 are connected through the output diode D.o For output capacitor C o When the load resistor R is charged, the diode D1 is reverse biased and cut off, the current in the multi-winding coupled inductor N1 drops to zero, and the instant when the current in the multi-winding coupled inductor N2 suddenly drops is taken as the end time of switching mode 3, which is time t4.

[0017] In switching mode 4, during the time period (t4, t5), power switches S1 and S2 are turned on, diode D1 is reverse-biased and cut off, and DC voltage source V... in Capacitor C1 and multi-winding coupled inductor N2 are connected through output diode D. o The load resistor R and the output capacitor C are given o Power supply, discharge of parasitic capacitance of power switches S1 and S2.

[0018] Preferably, the gain of the converter The expression is: ;

[0019] in, It is the duty cycle of power switch S1 or S2, and the duty cycles of power switches S1 and S2 are the same.

[0020] Preferably, the duty cycle of power switches S1 and S2 is... The value of is 0.3.

[0021] Preferably, the output diode D o Output capacitor C o Together with the load resistor R, they form the output unit of the DC / DC converter.

[0022] Preferably, at time t5, the energy of the parasitic capacitances on power switches S1 and S2 is depleted.

[0023] The beneficial effects of this invention are:

[0024] This invention relates to an active dual-switched capacitor coupled reverse-winding DC / DC converter. It combines inductors, capacitors, diodes, and coupled inductors (N1, N2) in a specific series-cross connection configuration to form an integrated high-gain unit. Through a reverse-coupled inductor voltage multiplier circuit (composed of multi-winding coupled inductors N1 and N2 connected in reverse, diode D1, and capacitor C1) and an active dual-switched capacitor structure (composed of power switches S1 and S2, capacitor C2, and diodes D2 and D3), the proposed converter can generate high voltage gain at a low turns ratio, which varies only between 1 and 2. This facilitates the design of high-quality, low-leakage-inductance coupled inductors. Reducing leakage inductance lowers energy loss, thereby optimizing converter efficiency.

[0025] Furthermore, the converter proposed in this invention achieves high gain at a small duty cycle. Operating at a small duty cycle not only improves power conversion efficiency by minimizing conduction losses but also helps reduce voltage stress on semiconductor components, further enhancing reliability. Simultaneously, the proposed converter features continuous input current and a common input-output ground, improving the safety of the power converter. This invention can boost lower DC input voltages to higher output voltages, expanding the boost range;

[0026] High-frequency switching of power switching transistors and the combination of inductors, capacitors, and diodes achieve efficient energy transfer with low energy loss; flexible adjustment of output voltage can be achieved by changing the turns ratio N of the two multi-winding coils; this invention implements a stable boost circuit with only a few components, and the circuit structure is simple and easy to implement. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the reverse magnetic winding DC / DC converter with active dual switched capacitor coupling structure described in this invention.

[0028] Figure 2 For the switching period T of power switches S1 and S2 s Voltage and current of power switches S1 and S2, current of multi-winding coupled inductors N1 and N2, and output diode D. o And the current waveforms of diodes D1 to D3;

[0029] Figure 3(a) shows the switching period T s The equivalent circuit diagram of the present invention in switching mode 1 is shown below;

[0030] Figure 3(b) is the equivalent circuit diagram of the present invention in switching mode 2;

[0031] Figure 3(c) is the equivalent circuit diagram of the present invention in switching mode 3;

[0032] Figure 3(d) is the equivalent circuit diagram of the present invention in switching mode 4;

[0033] Figure 4(a) shows the DC voltage source V in When the voltage is 40V, the voltage across the load resistor R is... Voltage waveform at approximately 240V;

[0034] Figure 4(b) shows the voltage waveforms of capacitors C1 and C2.

[0035] Figure 4(c) shows the voltage waveforms of diodes D1 and D2;

[0036] Figure 4(d) shows the voltage waveforms of diodes D3 and D0.

[0037] Figure 4(e) shows the current waveforms of the multi-winding coupled inductors N1 and N2.

[0038] Figure 4(f) shows the drain-source voltage V across power switches S1 and S2 when power switches S1 and S2 are on and off. S1 V S2 Waveform diagram.

[0039] Appendix Figure 2 In the middle, V gs1,2 Let i be the gate-source voltages of power switches S1 and S2, and the gate-source voltages of power switches S1 and S2 are the same. N1 For the current in the multi-winding coupled inductor N1, i N2 For the current in the multi-winding coupled inductor N2, i Do For output diode D o The current, i D1 Let i be the current in diode D1. D2 Let i be the current in diode D2. D3 Let i be the current in diode D3. in DC power supply V in The current, V Do V D1 V D2 V D3 These are the voltages of output diodes D0, D1, D2, and D3, respectively, in V. S1 V is the gate-drain voltage across power switch S1. S2 Let i be the gate-drain voltage across power switch S2. S11 For the current flowing through power switch S1, i S2 This is the current flowing through power switch S2. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0043] Specific Implementation Method 1: Combination Figure 1This embodiment describes an active dual-switched capacitor-coupled DC / DC converter with a reverse magnetic winding, including a DC voltage source V. in Diodes D1 to D3, Output diode D o Capacitors C1 to C2, output capacitor C o Multi-winding coupled inductors N1 to N2, power switch S1, power switch S2, and load resistor R;

[0044] The turns ratio of the multi-winding coupled inductor N2 to the multi-winding coupled inductor N1 is: ,and ;

[0045] Power switches S1 and S2 are controlled synchronously.

[0046] DC voltage source V in The positive terminal is connected to one end of capacitor C1 and the same terminal of multi-winding coupled inductor N1 simultaneously.

[0047] The other end of capacitor C1 is connected to the same terminal of multi-winding coupled inductor N2;

[0048] The anode of diode D1, the opposite terminal of multi-winding coupled inductor N1, and the drain of power switch S2 are connected simultaneously.

[0049] The opposite terminals of the multi-winding coupled inductor N2, the anode of diode D3, and the output diode D o The anode and the cathode of diode D1 are connected simultaneously;

[0050] The source of power switch S2 is connected to one end of capacitor C2 and the anode of diode D2 simultaneously;

[0051] The cathode of diode D3 is connected to the other end of capacitor C2 and the drain of power switch S1 simultaneously.

[0052] Output diode D o Cathode and output capacitor C o One end of the resistor is connected to one end of the load resistor R simultaneously;

[0053] Output capacitor C o The other end, the other end of the load resistor R, the source of power switch S1, the cathode of diode D2, and the DC voltage source V in The negative terminals are all connected to the power supply ground.

[0054] Among them, the output diode D o Output capacitor C o Together with the load resistor R, they form the output unit of the DC / DC converter.

[0055] This invention proposes a converter that can generate high voltage gain at a low turns ratio by using a reverse-coupled inductor voltage multiplier circuit (composed of multi-winding coupled inductors N1 and N2 connected in reverse, diode D1, and capacitor C1) and an active dual-switched capacitor structure (composed of power switches S1 and S2, capacitor C2, and diodes D2 and D3). The active dual-switched capacitor structure introduces the turns ratio N as an independent degree of freedom in the voltage gain, and high gain can be achieved with N only in the low range of 1 to 2. This structural innovation is not present in any previous dual-switched topologies.

[0056] This invention also employs "dual-switch synchronous control" to achieve the coexistence of continuous input current and high gain. By synchronously turning two switches on and off, the input current flows continuously through N1 and S1 during the on-phase and continuously through N2 and D2 / D3 during the off-phase, maintaining a pulsation-free and continuous input current. Simultaneously, due to the introduction of the turns ratio adjustment capability of the coupled inductor, a voltage gain significantly higher than that of existing technologies is achieved while maintaining continuous input current. This structure eliminates the contradiction between "continuous input current" and "high gain."

[0057] On the one hand, the synergistic effect of the dual-switched capacitor network and the turns ratio of the coupled inductor enables high voltage gain at a low duty cycle, effectively solving the boost requirements in low-voltage input applications. On the other hand, the ingenious configuration of the reverse magnetic winding and capacitor significantly reduces the voltage stress on the power switching transistor, allowing the use of low-voltage devices. At the same time, the circuit topology creates conditions for soft switching, greatly reducing switching losses and diode reverse recovery losses, thereby improving the overall conversion efficiency.

[0058] Further, see Figure 2 The switching period of both power switches is T. s T s Divided into four time periods by five times t1 to t5, namely time periods [t1, t2], (t2, t3], (t3, t4], and (t4, t5], the converter includes four switching modes, specifically:

[0059] Switching mode 1, see Figure 3(a). During the time period [t1, t2], power switches S1 and S2 are turned on, forming two current conduction paths: current flows through DC voltage source V. in A multi-winding coupled inductor N1, power switch S2, capacitor C2, and power switch S1 form a current conduction path, through which current flows to the DC voltage source V. in The multi-winding coupled inductor N1, diode D1, multi-winding coupled inductor N2, and capacitor C1 form another current conduction path. According to magnetic coupling theory, the overall magnetized inductance L formed by the multi-winding coupled inductors N1 and N2 is... M and leakage inductance Lk Capacitor C1 is charged through diode D1, and diodes D2, D3, and output diode D... o It does not conduct electricity under reverse voltage, while the output capacitor C o Independently supplying power to the load resistor R;

[0060] Switching mode 2, see Figure 3(b), during the time period (t2, t3], power switches S1 and S2 are turned off, and the DC voltage source V in The overall leakage inductance L formed by the multi-winding coupled inductors N1 and N2 k and magnetizing inductor L M The parasitic capacitance of power switch S2 is charged, and capacitor C2 charges the parasitic capacitance of power switch S1. At time t3, both power switches S1 and S2 are not connected. Diodes D2, D3, and output diode D... o Conductive;

[0061] Switching mode 3, see Figure 3(c). During the time period (t3, t4), power switches S1 and S2 are off. According to the volt-second balance principle, the voltage polarity of the multi-winding coupled inductor is opposite when the two power switches are off compared to when the power switches are on. Therefore, the DC voltage source V in When capacitor C1 is charged, the DC voltage source V in The multi-winding coupled inductor N2 and capacitor C1 charge capacitor C2 through diode D3, while the DC voltage source V... in The multi-winding coupled inductor N2 and capacitor C1 are connected through the output diode D. o For output capacitor C o When the load resistor R is charged, the diode D1 is reverse biased and cut off, the current in the multi-winding coupled inductor N1 drops to zero, and the instant when the current in the multi-winding coupled inductor N2 suddenly drops is taken as the end time of switching mode 3, which is time t4.

[0062] Switching mode 4, see Figure 3(d). During the time period (t4, t5), power switches S1 and S2 are turned on, diode D1 is reverse-biased and cut off, and DC voltage source V... in Capacitor C1 and multi-winding coupled inductor N2 are connected through output diode D. o The load resistor R and the output capacitor C are given o Power supply, discharge of parasitic capacitance of power switches S1 and S2;

[0063] And the current flows through the DC voltage source V in The multi-winding coupled inductor N1, power switch S2, and diode D2 form a current conduction path; the current flows through the DC voltage source V. in The multi-winding coupled inductor N2, diode D3, and power switch S1 form another current conduction path;

[0064] At time t5, the parasitic capacitance energy on power switches S1 and S2 is depleted.

[0065] In this preferred embodiment, efficient energy storage is achieved by charging the capacitor through the input power supply during the time period of mode 1.

[0066] During the time period of mode 2, the parasitic capacitance of the switching transistor is discharged to ensure that the natural resonance at both ends of the switching transistor is close to 0 after the switching transistor is turned on, which greatly reduces the switching loss.

[0067] During the 3rd mode, the current is limited by the multi-coupled winding inductor, which causes the voltage across the switching transistor to rise slowly, achieving near-lossless turn-off.

[0068] During the time period of mode 4, the input voltage and the energy stored in the capacitor are combined to supply power to the output terminal, thereby achieving high voltage output.

[0069] Furthermore, the gain of the converter The expression is: ;

[0070] in, This refers to the duty cycle of power switch S1 or S2, and the duty cycles of power switches S1 and S2 are the same. This represents the turns ratio of the multi-winding coupled inductor N2 to the multi-winding coupled inductor N1. The duty cycle of power switches S1 and S2. The value of is 0.3.

[0071] converter gain The specific derivation process is as follows:

[0072] Switching modes 2 and 4 are too short-lived to be considered in voltage gain analysis. Based on the analysis of switching mode 1, the relevant equations are as follows:

[0073] (1);

[0074] (2);

[0075] (3);

[0076] in, This is the voltage of the DC voltage source. The voltage across the multi-winding coupled inductor N1 in switching mode 1. , and These represent the voltages across capacitors C1, C2, and C0, respectively. , and These represent the voltages of diodes D2, D3, and D0, respectively. For turns ratio, use express.

[0077] Similarly, based on the switching mode 3 analysis, the relevant equations can be obtained as follows:

[0078] (4);

[0079] (5);

[0080] in, The voltage of the multi-winding coupled inductor N1 in switching mode 3 is given. It is the voltage of diode D1.

[0081] According to the volt-second balance principle, the multi-winding coupled inductor N1 has the following relationship:

[0082] (6);

[0083] In the formula, T represents the duty cycle of the two power switches. s The switching cycle.

[0084] Substituting equations (1) to (5) into equation (6), we obtain the output voltage. and output voltage gain ;

[0085] (7);

[0086] In practical applications, the duty cycle of the power switch S is... The optimal value is 0.3.

[0087] Combining formulas (1) to (7), we can also obtain the duty cycle of the conduction. and turns ratio The voltage expressions for each capacitor, diode, and switching transistor are as follows:

[0088] (8);

[0089] (9);

[0090] (10);

[0091] (11);

[0092] (12);

[0093] (13);

[0094] (14);

[0095] Verification experiment:

[0096] The test conditions are: when the input DC voltage source voltage V in =40V, N=1.2, D=0.3, and output power of 200W were used to verify the effectiveness of the invention. See details. Figures 4(a) to 4(f) ;

[0097] Figure 4(a) shows the DC voltage source V in When the voltage is 40V, the voltage across the load resistor R is... The waveform at approximately 240V verifies that the boost converter can still achieve high voltage gain, fast response, and stable waveform even at a low turns ratio.

[0098] Figure 4(b) shows the voltage waveforms of capacitors C1 and C2. As can be seen from Figure 4(b), the peak voltage of capacitor C1 is approximately 51V, and the peak voltage of capacitor C2 is approximately 227V, verifying that the present invention achieves high gain through a low turns ratio, while significantly reducing device voltage stress. In Figure 4(c), the peak voltage of diode D1 is approximately 73V, the peak voltage of diode D2 is approximately 42V, and the peak voltage of diode D2 is approximately 227V. The overall waveform is close to an ideal square wave and is stable, verifying the stability of the reverse magnetic winding DC / DC converter with the active dual-switched capacitor coupling structure of the present invention during operation.

[0099] In Figure 4(d), the peak voltage of diode D3 is approximately 226V. o The peak voltage is approximately 228V, and the overall waveform is close to an ideal square wave with a stable waveform.

[0100] Figure 4(e) shows the current waveforms of the multi-winding coupled inductors N1 and N2. As can be seen from Figure 4(e), at the instant when the power switches S1 and S2 switch synchronously (from on to off), the transition time between the primary current (current of the multi-winding coupled inductor N1) and the secondary current (current of the multi-winding coupled inductor N2) is short, the current waveform has no obvious oscillation or tailing, the loss is low, and the overall efficiency is high and the reliability is strong.

[0101] Figure 4(f) shows the drain-source voltage V across power switches S1 and S2 when power switches S1 and S2 are on and off. S1 V S2 The waveform diagram shows that there are no voltage spikes when the two switches are turned off, eliminating the need for a snubber circuit. It also shows that the duty cycle and turns ratio are independently controlled to control the stress, providing greater design freedom than traditional solutions.

[0102] In conclusion, Figures 4(a) to 4(f)It can be demonstrated that the DC / DC converter with reverse magnetic winding of the active dual switched capacitor coupling structure of the present invention still has a high output gain at a low turns ratio.

[0103] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A DC / DC converter with an active dual-switched capacitor coupling structure and a reverse magnetic winding, characterized in that, Including DC voltage source V in Diodes D1 to D3, Output diode D o Capacitors C1 to C2, output capacitor C o The components include multi-winding coupled inductors N1 to N2, power switches S1 and S2, and a load resistor R. The turns ratio of multi-winding coupled inductor N2 to multi-winding coupled inductor N1 is... ,and Power switches S1 and S2 are controlled synchronously. DC voltage source V in The positive terminal is connected to one end of capacitor C1 and the same terminal of multi-winding coupled inductor N1 simultaneously. The other end of capacitor C1 is connected to the same terminal of multi-winding coupled inductor N2; The anode of diode D1, the opposite terminal of multi-winding coupled inductor N1, and the drain of power switch S2 are connected simultaneously. The opposite terminals of the multi-winding coupled inductor N2, the anode of diode D3, and the output diode D o The anode and the cathode of diode D1 are connected simultaneously; The source of power switch S2 is connected to one end of capacitor C2 and the anode of diode D2 simultaneously; The cathode of diode D3 is connected to the other end of capacitor C2 and the drain of power switch S1 simultaneously. Output diode D o Cathode and output capacitor C o One end of the resistor is connected to one end of the load resistor R simultaneously; Output capacitor C o The other end, the other end of the load resistor R, the source of power switch S1, the cathode of diode D2, and the DC voltage source V in The negative terminals are all connected to the power supply ground.

2. The DC / DC converter with an active dual-switched capacitor coupling structure and a reverse magnetic winding according to claim 1, characterized in that, The switching period of both power switches is T. s T s Divided into four time periods by five times from t1 to t5, namely time periods [t1, t2], (t2, t3], (t3, t4], and (t4, t5], the converter includes four switching modes, specifically: In switching mode 1, during the time period [t1, t2], power switches S1 and S2 are turned on. According to the magnetic coupling theory, the overall magnetized inductance L formed by the multi-winding coupled inductors N1 and N2 is... M and leakage inductance L k Capacitor C1 is charged through diode D1, and diodes D2, D3, and output diode D... o It does not conduct electricity under reverse voltage, while the output capacitor C o Independently supplying power to the load resistor R; In switching mode 2, during the time period (t2, t3], power switches S1 and S2 are turned off, and the DC voltage source V... in The overall leakage inductance L formed by the multi-winding coupled inductors N1 and N2 k and magnetizing inductor L M The parasitic capacitance of power switch S2 is charged, and capacitor C2 charges the parasitic capacitance of power switch S1. At time t3, both power switches S1 and S2 are not connected. Diodes D2, D3, and output diode D... o Conductive; In switching mode 3, during the time period (t3, t4), power switches S1 and S2 are turned off, and the DC voltage source V... in When capacitor C1 is charged, the DC voltage source V in The multi-winding coupled inductor N2 and capacitor C1 charge capacitor C2 through diode D3, while the DC voltage source V... in The multi-winding coupled inductor N2 and capacitor C1 are connected through the output diode D. o For output capacitor C o When the load resistor R is charged, the diode D1 is reverse biased and cut off, the current in the multi-winding coupled inductor N1 drops to zero, and the instant when the current in the multi-winding coupled inductor N2 suddenly drops is taken as the end time of switching mode 3, which is time t4. In switching mode 4, during the time period (t4, t5), power switches S1 and S2 are turned on, diode D1 is reverse-biased and cut off, and DC voltage source V... in Capacitor C1 and multi-winding coupled inductor N2 are connected through output diode D. o The load resistor R and the output capacitor C are given o Power supply, discharge of parasitic capacitance of power switches S1 and S2.

3. The DC / DC converter with an active dual-switched capacitor coupling structure and a reverse magnetic winding according to claim 1, characterized in that, converter gain The expression is: ; in, It is the duty cycle of power switch S1 or S2, and the duty cycles of power switches S1 and S2 are the same.

4. The DC / DC converter with an active dual-switched capacitor coupling structure and a reverse magnetic winding according to claim 3, characterized in that, Duty cycle of power switches S1 and S2 The value of is 0.

3.

5. The DC / DC converter with an active dual-switched capacitor coupling structure and a reverse magnetic winding according to claim 1, characterized in that, Output diode D o Output capacitor C o Together with the load resistor R, they form the output unit of the DC / DC converter.

6. The DC / DC converter with an active dual-switched capacitor coupling structure and a reverse magnetic winding according to claim 1, characterized in that, At time t5, the energy of the parasitic capacitances on power switches S1 and S2 is depleted.

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