High-gain bridgeless series output rectifier based on low-voltage energy recovery

Abstract

The invention discloses a high-gain bridgeless series output rectifier based on low-voltage energy recovery, and relates to the technical field of converters. A circuit of the high-gain bridgeless series output rectifier comprises two secondary boosting units, a first secondary boosting unit composed of a rectifier diode DR1, a diode D1, a supplementary diode DS1, a switching tube S1, an intermediate capacitor Cm1 and an intermediate inductor LS1, a matching inductor L, an output diode Do1, an output capacitor Co1 and an output capacitor Co2, and the high-gain bridgeless series output rectifier is used for electric energy conversion in an alternating current positive half input period; a rectifier diode DR2, a diode D2, a supplement diode DS2, a switching tube S2, an intermediate capacitor Cm2 and an intermediate inductor LS2 form a second secondary boost unit, and the second secondary boost unit is matched with an inductor L, an output diode Do2, an output capacitor Co1 and an output capacitor Co2 and is used for electric energy conversion in an alternating current negative half input period. According to the invention, a part of diodes of the rectifier bridge are canceled, so that low input voltage loss caused by the conduction voltage drop of the diodes of the rectifier bridge and the conduction loss of the diodes are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of converters, and in particular relates to a high-gain bridgeless series output rectifier based on low-voltage energy recovery. Background Art

[0002] Driven by the demand for low-carbon environmental protection and the Internet of Everything, the data sampling modules at environmental target points need to be self-powered. Specifically, in order to realize the collection and dataization of key information under various complex environmental conditions, it is necessary to collect weak energy from the environment to flexibly realize the self-powering of the sampling modules at environmental target points.

[0003] At present, the self-powered solution of the sampling module mainly uses a small power generation device to generate low-voltage AC (which can be called an energy recovery device), such as 0.4, 0.7, and 1.5V peak AC. Then, through the AC-DC power conversion circuit, a stable low-voltage (such as 3.3V, 9V, 15V) output is achieved to power the subsequent battery pack and load.

[0004] Traditional AC-DC power conversion circuits usually have the problem that low-voltage AC input cannot be efficiently converted, such as Figure 1 This is a traditional high-gain boost rectifier circuit using a diode rectifier bridge. This circuit mainly achieves high gain characteristics of input and output voltages by reusing the switch tubes of the cascade boost circuit. Although this traditional high-gain boost circuit can achieve high gain from input to output voltage, its rectifier bridge always has two conducting diodes. The two conducting rectifier bridge diodes have a large conduction voltage drop loss, which makes the input side voltage of the converter lower. When the output voltage of the energy recovery device is lower than a certain threshold voltage (such as 1V), Figure 1 The conventional high boost converter shown will not work properly due to the input voltage being too low.

[0005] In order to broaden the working range of the above-mentioned traditional secondary high boost converter and further improve the power conversion efficiency of the converter, the present invention proposes a high-gain bridgeless series output rectifier based on low-voltage energy recovery. The present invention can further convert the low-voltage AC input into 15V DC by connecting the outputs of two conversion units in series. This high-voltage DC is more conducive to the extension and heightening of the subsequent antenna load (lower cable loss and better signal transmission effect) and fast charging of the battery. Summary of the invention

[0006] The object of the present invention is to provide a high-gain bridgeless series output rectifier based on low-voltage energy recovery to solve the problems of low power conversion efficiency of the traditional secondary high boost converter mentioned in the above background technology.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The present invention proposes a high-gain bridgeless series output rectifier based on low-voltage energy recovery, the circuit of which includes an inductor L, a rectifier diode D R1 , rectifier diode D R2 , diode D1, diode D2, supplementary diode D S1 , Supplementary diode D S2 , switch tube S1, switch tube S2, intermediate capacitor C m1 、Intermediate capacitor C m2 , intermediate inductance L S1 , intermediate inductance L S2 , output diode D o1 , output diode D o2 , output capacitor C o1 and output capacitor C o2 ;

[0009] The rectifier diode D R1 , diode D1, supplementary diode D S1 , switch tube S1, intermediate capacitor C m1 , intermediate inductance L S1 The first secondary boost unit is composed of an inductor L and an output diode D. o1 , output capacitor C o1 , output capacitor C o2 , used for power conversion within the positive half cycle of AC input;

[0010] The rectifier diode D R2 , diode D2, supplementary diode D S2 , switch tube S2, intermediate capacitor C m2 , intermediate inductance L S2 The second secondary boost unit is composed of an inductor L and an output diode D o2 , output capacitor C o1 , output capacitor C o2 , used for power conversion during the negative half cycle of AC input.

[0011] Preferably, one end of the input side is connected to one end of the inductor L, and the other end of the inductor L is connected to the rectifier diode D R1 Anode, rectifier diode D R2 The cathode connection of

[0012] Rectifier diode D R1 The cathode of the supplementary diode D S1 The anode of the diode D1 is connected to the cathode of the diode D1 and the intermediate capacitor C m1 The positive pole and the middle inductor L S1 One end is connected to the middle inductor L S1The other end of the supplementary diode D S1 The cathode of the switch tube S1, the drain of the output diode D o1 The anode of the output diode D o1 The cathode and output capacitor C o1 The positive electrode, load R L One end is connected;

[0013] Rectifier diode D R2 The anode of the supplementary diode D S2 The cathode of the diode D2 is connected to the cathode of the diode D2; the anode of the diode D2 is connected to the intermediate capacitor C m2 The negative pole and the middle inductor L S2 One end is connected to the middle inductor L S2 The other end of the supplementary diode D S2 The anode of the switch tube S2, the source of the output diode D o2 The cathode of the output diode D o2 The anode and output capacitor C o2 The negative electrode, load R L The other end is connected;

[0014] The other end of the input side is connected to the middle capacitor C m1 The negative electrode and the middle capacitor C m2 The positive electrode, the source of the switch tube S1, the drain of the switch tube S2, and the output capacitor C o1 The negative pole of the output capacitor C o2 The positive pole is connected.

[0015] Preferably, the operating mode of the high-gain bridgeless series output rectifier during the AC positive half input cycle is as follows:

[0016] Working mode 1: In this stage, the switch tube S1 is in the on state, and the input end passes through the rectifier diode D R1 , Supplementary diode D S1 and switch tube S1 to charge the inductor L; at the same time, the intermediate capacitor C m1 Through the switch tube S1 to the inductor L S1 Charging; at this stage, the inductor current i L , inductor current i LS1 Linear increase; output capacitance C o1 , output capacitor C o2 For load R L Energy supply;

[0017] Working mode 2: This stage starts when the switch tube S1 is turned off; diode D1 and rectifier diode D R1 The conduction current is i L Provides a freewheeling path, and the inductor current i L The middle capacitor Cm1 Charging; at the same time, the output diode D o1 is the inductor current i LS1 Provides a freewheeling path, and the inductor current i LS1 is the output capacitor C o1 Charging and Loading R L Energy supply; at this stage, the inductor current i L , inductor current i LS1 The output capacitance C o2 Continue to load R L Energy supply;

[0018] Working mode 3: When the inductor current i L , inductor current i LS1 This stage begins when the linear decline reaches zero; the rectifier diode D R1 , diode D1, supplementary diode D S1 , switch tube S1 and output diode D o1 are both in the off state; the output capacitor C o1 , output capacitor C o2 Continue to load R L Energy supply.

[0019] Preferably, the operating mode of the high-gain bridgeless series output rectifier during the AC negative half input cycle is as follows:

[0020] Working mode 4: In this stage, the switch tube S2 is in the on state, and the input end passes through the rectifier diode D R2 , Supplementary diode D S2 and switch tube S2 to charge the inductor L; at the same time, the intermediate capacitor C m2 Through the switch tube S2 to the inductor L S2 Charging; at this stage, the inductor current i L , inductor current i LS2 Linear increase; output capacitance C o1 , output capacitor C o2 For load R L Energy supply;

[0021] Working mode 5: This stage starts when the switch tube S2 is turned off; diode D2 and rectifier diode D R2 The conduction current is i L Provides a freewheeling path, and the inductor current i L The middle capacitor C m2 Charging; at the same time, the output diode D o2 is the inductor current i LS2 Provides a freewheeling path, and the inductor current i LS2 is the output capacitor C o2 Charging and Loading R LEnergy supply; at this stage, the inductor current i L , inductor current i LS2 The output capacitance C o1 Continue to load R L Energy supply;

[0022] Working mode 6: When the inductor current i L , inductor current i LS2 This stage begins when the linear decline reaches zero; the rectifier diode D R2 , diode D2, supplementary diode D S2 , switch tube S2 and output diode D o2 are both in the off state; the output capacitor C o1 , output capacitor C o2 Continue to load R L Energy supply.

[0023] Preferably, the switch tube S1 and the switch tube S2 are driven as follows:

[0024] Output voltage V o Sampling signal and output reference voltage V o,ref The error feedback signal is compared with the triangular wave to generate the output signal V of comparator 1. comp1 ;

[0025] At the same time, the input voltage v in The sampling signal passes through the sampling circuit and then through the comparator 2 to generate the output signal V of the comparator 2. comp2 ;

[0026] V comp2 With V comp1 The driving signal G of the switch tube S1 is generated through the AND gate S1 ;

[0027] V comp2 After passing through the NOT gate, it is then connected to V comp1 The driving signal G of the switch tube S2 is generated through the AND gate S2 .

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) Compared with the conventional quadratic high boost converter, the present invention eliminates some diodes of the rectifier bridge, thereby avoiding the low input voltage loss caused by the conduction voltage drop of the rectifier bridge diode and the conduction loss of the diode.

[0030] (2) Although the total number of components is increased compared to the traditional secondary converter, a higher output voltage gain is achieved by using two secondary boost units in series, and the number of semiconductor conduction of the converter of the present invention is lower than that of the traditional secondary high boost converter, achieving higher power conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a topological diagram of a conventional quadratic high boost converter;

[0032] Figure 2 It is a topological schematic diagram of a high-gain bridgeless series output rectifier in the present invention;

[0033] Figure 3 It is a schematic diagram of an equivalent circuit of a working mode of a high-gain bridgeless series output rectifier in a positive half cycle in the present invention;

[0034] Figure 4 It is a schematic diagram of an equivalent circuit of a working mode of a high-gain bridgeless series output rectifier in a negative half cycle in the present invention;

[0035] Figure 5 It is a waveform diagram of key components of the high-gain bridgeless series output rectifier in the positive half cycle of AC input in the present invention;

[0036] Figure 6 It is a waveform diagram of key components of the high-gain bridgeless series output rectifier in the negative half cycle of AC input in the present invention;

[0037] Figure 7 It is a control implementation principle diagram of the high-gain bridgeless series output rectifier in the present invention;

[0038] Figure 8 This is a waveform simulation diagram of the high-gain bridgeless series output rectifier in the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] The circuit of the present invention mainly includes an inductor L, a rectifier diode D R1 , rectifier diode D R2 , diode D1, diode D2, supplementary diode D S1 , Supplementary diode D S2, switch tube S1, switch tube S2, intermediate capacitor C m1 、Intermediate capacitor C m2 , intermediate inductance L S1 , intermediate inductance L S2 , output diode D o1 , output diode D o2 , output capacitor C o1 , output capacitor C o2 .

[0042] Among them, the rectifier diode D R , diode D, supplementary diode D S , switch tube S, intermediate capacitor C m , intermediate inductance L S A secondary boost unit is formed. Two secondary boost units are formed in the high-gain bridgeless series output rectifier circuit, and the outputs of the two secondary boost units are connected in series. Figure 2 This is a schematic diagram of the high-gain bridgeless series output rectifier circuit in the present invention.

[0043] Specifically, one end of the input side is connected to one end of the inductor L, and the other end of the inductor L is connected to the rectifier diode D R1 Anode, rectifier diode D R2 The cathode connection of the rectifier diode D R1 The cathode of the supplementary diode D S1 The anode of the diode D1 is connected to the cathode of the diode D1 and the intermediate capacitor C m1 The positive pole and the middle inductor L S1 One end is connected to the middle inductor L S1 The other end is connected to the drain of the switch tube S1 and the output diode D o1 Anode of the supplementary diode D S1 The cathode of the output diode D o1 The cathode and output capacitor C o1 The positive electrode, load R L One end is connected.

[0044] The other end of the input side is connected to the middle capacitor C m1 The negative electrode and the middle capacitor C m2 The positive electrode, the source of the switch tube S1, the drain of the switch tube S2, and the output capacitor C o1 The negative pole of the output capacitor C o2 The positive pole of the rectifier diode D R2 The anode of the diode D2 and the cathode of the supplementary diode D S2 The cathode of diode D2 is connected to the middle capacitor C m2 The negative pole and the middle inductor L S2 One end is connected; the middle inductor LS2 The other end is connected to the source of the switch tube S2 and the output diode D o2 The cathode of the supplementary diode D S2 The anode of the output diode D o2 The anode and output capacitor C o2 The negative electrode, load R L The other end is connected.

[0045] To illustrate the working principle of the high-gain bridgeless series output rectifier of the present invention, the system can be equivalent to the following: Figure 3 and Figure 4 The circuit operating mode diagram is shown.

[0046] Figure 3 (a) is the equivalent circuit of the high gain bridgeless series output rectifier in working mode 1 in the positive half cycle; Figure 3 (b) is the equivalent circuit of the high gain bridgeless series output rectifier in working mode 2 in the positive half cycle; Figure 3 (c) is the equivalent circuit of the high gain bridgeless series output rectifier in working mode 3 in the positive half cycle. Figure 4 (d) is the equivalent circuit of the high gain bridgeless series output rectifier in working mode 4 in the negative half cycle. Figure 4 (e) is the equivalent circuit of the high gain bridgeless series output rectifier in working mode 5 in the negative half cycle. Figure 4 (f) is the equivalent circuit of the high gain bridgeless series output rectifier in working mode 6 in the negative half cycle.

[0047] Depend on Figure 3 and Figure 4 The working mode of the device can obtain the key device waveform. Figure 5 This is the waveform diagram of the key components of the bridgeless boost converter in the positive half cycle of the AC input. Figure 6 This is the waveform diagram of the key components of the converter during the negative half cycle of the AC input.

[0048] Working mode 1[0,d on T S ]: In this stage, the switch tube S1 is in the on state, and the input end passes through the rectifier diode D R1 , Supplementary diode D S1 and switch tube S1 to charge the inductor L; at the same time, the intermediate capacitor C m1 Through the switch tube S1 to the inductor L S1 Charging. In this stage, the inductor current i L , inductor current i LS1 Linear increase. Output capacitor C o1 , output capacitor C o2 For load R L Energy supply.

[0049] Working mode 2[d on T S ,d on T S +d of2 T S ]: When the switch tube S1 is turned off, working mode 2 begins. Diode D1, rectifier diode D R1 The conduction current is i L Provides a freewheeling path, and the inductor current i L The middle capacitor C m1 Charging; at the same time, the output diode D o1 is the inductor current i LS1 Provides a freewheeling path, and the inductor current i LS1 is the output capacitor C o1 Charging and Loading R L In this stage, the inductor current i L , inductor current i LS1 The output capacitance C o2 Continue to load R L Energy supply.

[0050] Working mode 3[d on T S +d of2 T S ,T S ]:When the inductor current i L , inductor current i LS1 When the linear decrease reaches zero, working mode 3 begins. Rectifier diode D R1 , diode D1, supplementary diode D S1 , switch tube S1 and output diode D o1 The output capacitor C o1 , output capacitor C o2 Continue to load R L Energy supply.

[0051] Working mode 4[0,d on T S ]: In this stage, the switch tube S2 is in the on state, and the input end passes through the rectifier diode D R2 , Supplementary diode D S2 and switch tube S2 to charge the inductor L; at the same time, the intermediate capacitor C m2 Through the switch tube S2 to the inductor L S2 Charging. In this stage, the inductor current i L , inductor current i LS2 Linear increase. Output capacitor C o1 , output capacitor C o2 For load R L Energy supply.

[0052] Working mode 5[d on T S ,d on T S +d of2 T S ]: When the switch tube S2 is turned off, working mode 5 begins. Diode D2, rectifier diode D R2 The conduction current is i L Provides a freewheeling path, and the inductor current i L The middle capacitor C m2 Charging; at the same time, the output diode D o2 is the inductor current i LS2 Provides a freewheeling path, and the inductor current i LS2 is the output capacitor C o2 Charging and Loading R L In this stage, the inductor current i L , inductor current i LS2 The output capacitance C o1 Continue to load R L Energy supply.

[0053] Working mode 6[d on T S +d of2 T S ,T S ]:When the inductor current i L , inductor current i LS2 When the linear decrease reaches zero, the working mode 6 begins. Rectifier diode D R2 , diode D2, supplementary diode D S2 , switch tube S2 and output diode D o2 The output capacitor C o1 , output capacitor C o2 Continue to load R L Energy supply.

[0054] The specific control method of high gain bridgeless series output rectifier is as follows Figure 7 As shown. Output voltage V o Sampling signal and output reference voltage V o,ref The error feedback signal is compared with the triangular wave to generate the output signal V of comparator 1. comp1 At the same time, the energy recovery low voltage output device is used as the input of the present invention, and its input voltage v in The sampling signal passes through the sampling circuit and then through the comparator 2 to generate the output signal V of the comparator 2. comp2 .

[0055] V comp2 With V comp1 The driving signal G of the switch tube S1 is generated through the AND gate S1 ;

[0056] V comp2 After passing through the NOT gate, it is then connected to V comp1 The driving signal G of the switch tube S2 is generated through the AND gate S2 .

[0057] It should be noted that the high-gain bridgeless output series rectifier circuit of the present invention is mainly used in the field of low-voltage energy recovery. Therefore, the circuit input voltage is low and the power conversion power is small. Although the number of circuit components of the present invention is large, the individual components still have the characteristics of low cost due to low withstand voltage requirements and low power requirements.

[0058] Experimental verification:

[0059] In order to verify the feasibility of the high-gain bridgeless series output rectifier in the present invention, the PSIM simulation software was used to simulate and verify the circuit. Specific parameters: AC input uses sinusoidal signal fitting, AC voltage peak is 1.4V, frequency is 300Hz, inductance L is 1.5uH, intermediate inductance L S1 , intermediate inductance L S2 is 4.8uH, the middle capacitor C m1 、Intermediate capacitor C m2 The output capacitor C is 200uF. o1 , output capacitor C o2 is 100uF, the output voltage is 15V, the load R L The resistance is 4000Ω, the power is 56mW, the switching frequency is 47k, the P in the PI parameter is 0.8, and the I is 0.005. Note: All diodes in the circuit are set with a 0.3V conduction voltage drop to verify the performance of the circuit of the present invention in achieving a 15V high gain output at a low input voltage.

[0060] Figure 8 This is a waveform simulation diagram of the key components of the high-gain bridgeless series output rectifier in the present invention. Figure 8 It can be seen that when the AC input peak value is 1.4V and the frequency is 300Hz, the bridgeless boost converter achieves a 15V regulated output. And the switch tube S1 and the switch tube S2 are respectively in The positive and negative half-cycles work alternately, realizing the AC-DC conversion operation without a rectifier bridge. Moreover, the simulation waveforms of each device are stable, indicating that the converter can operate stably under the control scheme proposed by the present invention. Figure 5 and Figure 6 This is consistent with the theoretical waveform shown.

[0061] Compared with the traditional AC-DC rectifier circuit based on the rectifier bridge, the present invention solves the problem of high-efficiency rectification under low input voltage conditions in the field of energy recovery. By adopting dual high-gain conversion units and connecting the outputs in series, a high-gain conversion function of 15V DC output under 1.4V peak AC input is achieved. At the same time, this topology is based on a bridgeless structure. Although the total number of devices increases, during operation, the number of semiconductor conduction devices is reduced compared to the traditional secondary high-boost converter, which is more conducive to efficient power conversion.

[0062] The above description is only used to help understand the method of the present invention and its core essence, but the protection scope of the present invention is not limited thereto. For those skilled in the art in the art, equivalent replacement or change according to the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A high-gain bridgeless series output rectifier based on low-voltage energy recovery, characterized in that: The circuit includes inductor L, rectifier diode D R1 , rectifier diode D R2 , diode D1, diode D2, supplementary diode D S1 , Supplementary diode D S2 , switch tube S1, switch tube S2, intermediate capacitor C m1 、Intermediate capacitor C m2 , intermediate inductance L S1 , intermediate inductance L S2 , output diode D o1 , output diode D o2 , output capacitor C o1 and output capacitor C o2 ; The rectifier diode D R1 , diode D1, supplementary diode D S1 , switch tube S1, intermediate capacitor C m1 , intermediate inductance L S1 The first secondary boost unit is composed of an inductor L and an output diode D. o1 , output capacitor C o1 , output capacitor C o2 , used for power conversion within the positive half cycle of AC input; The rectifier diode D R2 , diode D2, supplementary diode D S2 , switch tube S2, intermediate capacitor C m2 , intermediate inductance L S2 The second secondary boost unit is composed of an inductor L and an output diode D o2 , output capacitor C o1 , output capacitor C o2 , used for power conversion during the negative half cycle of AC input.

2. The high-gain bridgeless series output rectifier based on low-voltage energy recovery according to claim 1, characterized in that: One end of the input side is connected to one end of the inductor L, and the other end of the inductor L is connected to the rectifier diode D R1 Anode, rectifier diode D R2 The cathode connection of Rectifier diode D R1 The cathode of the supplementary diode D S1 The anode of the diode D1 is connected to the cathode of the diode D1 and the intermediate capacitor C m1 The positive pole and the middle inductor L S1 One end is connected to the middle inductor L S1 The other end of the supplementary diode D S1 The cathode of the switch tube S1, the drain of the output diode D o1 The anode of the output diode D o1 The cathode and output capacitor C o1 The positive electrode, load R L One end is connected; Rectifier diode D R2 The anode of the supplementary diode D S2 The cathode of the diode D2 is connected to the cathode of the diode D2; the anode of the diode D2 is connected to the intermediate capacitor C m2 The negative pole and the middle inductor L S2 One end is connected to the middle inductor L S2 The other end of the supplementary diode D S2 The anode of the switch tube S2, the source of the output diode D o2 The cathode of the output diode D o2 The anode and output capacitor C o2 The negative electrode, load R L The other end is connected; The other end of the input side is connected to the middle capacitor C m1 The negative electrode and the middle capacitor C m2 The positive electrode, the source of the switch tube S1, the drain of the switch tube S2, and the output capacitor C o1 The negative pole of the output capacitor C o2 The positive pole is connected.

3. The high-gain bridgeless series output rectifier based on low-voltage energy recovery according to claim 2, characterized in that: The working mode in the positive half input cycle of AC is as follows: Working mode 1: In this stage, the switch tube S1 is in the on state, and the input end passes through the rectifier diode D R1 , Supplementary diode D S1 and switch tube S1 to charge the inductor L; at the same time, the intermediate capacitor C m1 Through the switch tube S1 to the inductor L S1 Charging; at this stage, the inductor current i L , inductor current i LS1 Linear increase; output capacitance C o1 , output capacitor C o2 For load R L Energy supply; Working mode 2: This stage starts when the switch tube S1 is turned off; diode D1 and rectifier diode D R1 The conduction current is i L Provides a freewheeling path, and the inductor current i L The middle capacitor C m1 Charging; at the same time, the output diode D o1 is the inductor current i LS1 Provides a freewheeling path, and the inductor current i LS1 is the output capacitor C o1 Charging and Loading R L Energy supply; In this stage, the inductor current i L , inductor current i LS1 The output capacitance C o2 Continue to load R L Energy supply; Working mode 3: When the inductor current i L , inductor current i LS1 This stage begins when the linear decline reaches zero; the rectifier diode D R1 , diode D1, supplementary diode D S1 , switch tube S1 and output diode D o1 are both in the off state; the output capacitor C o1 , output capacitor C o2 Continue to load R L Energy supply.

4. The high-gain bridgeless series output rectifier based on low-voltage energy recovery according to claim 3, characterized in that: The working mode during the negative half input cycle of AC is as follows: Working mode 4: In this stage, the switch tube S2 is in the on state, and the input end passes through the rectifier diode D R2 , Supplementary diode D S2 and switch tube S2 to charge the inductor L; at the same time, the intermediate capacitor C m2 Through the switch tube S2 to the inductor L S2 Charging; at this stage, the inductor current i L , inductor current i LS2 Linear increase; output capacitance C o1 , output capacitor C o2 For load R L Energy supply; Working mode 5: This stage starts when the switch tube S2 is turned off; diode D2 and rectifier diode D R2 The conduction current is i L Provides a freewheeling path, and the inductor current i L The middle capacitor C m2 Charging; at the same time, the output diode D o2 is the inductor current i LS2 Provides a freewheeling path, and the inductor current i LS2 is the output capacitor C o2 Charging and Loading R L Energy supply; In this stage, the inductor current i L , inductor current i LS2 The output capacitance C o1 Continue to load R L Energy supply; Working mode 6: When the inductor current i L , inductor current i LS2 This stage begins when the linear decline reaches zero; the rectifier diode D R2 , diode D2, supplementary diode D S2 , switch tube S2 and output diode D o2 are both in the off state; the output capacitor C o1 , output capacitor C o2 Continue to load R L Energy supply.

5. The high-gain bridgeless series output rectifier based on low-voltage energy recovery according to claim 3 or 4, characterized in that: The driving of the switch tube S1 and the switch tube S2 is as follows: Output voltage V o Sampling signal and output reference voltage V o,ref The error feedback signal is compared with the triangular wave to generate the output signal V of comparator 1. comp1 ; At the same time, the input voltage v in The sampling signal passes through the sampling circuit and then through the comparator 2 to generate the output signal V of the comparator 2. comp2 ; V comp2 With V comp1 The driving signal G of the switch tube S1 is generated through the AND gate S1 ; V comp2 After passing through the NOT gate, it is then connected to V comp1 The driving signal G of the switch tube S2 is generated through the AND gate S2 .

Images