High-Gain Bridgeless Series Output Rectifier Based on Low-Voltage Energy Recovery

Abstract

The present invention discloses a high-gain bridge-less series output rectifier based on low-voltage energy recovery, which relates to the technical field of converters; the high-gain bridge-less series output rectifier has a circuit including two quadratic boost units, a rectifier diode D R1 , a diode D1, a complementary diode D S1 , a switching tube S1, an intermediate capacitor C m1 , and an intermediate inductor L S1 to form a first quadratic boost unit, which cooperates with an inductor L, an output diode D o1 , an output capacitor C o1 , and an output capacitor C o2 for power conversion during the positive half-input cycle of the alternating current; a rectifier diode D R2 , a diode D2, a complementary diode D S2 , a switching tube S2, an intermediate capacitor C m2 , and an intermediate inductor L S2 form a second quadratic boost unit, which cooperates with an inductor L, an output diode D o2 , an output capacitor C o1 , and an output capacitor C o2 for power conversion during the negative half-input cycle of the alternating current. The present invention eliminates some diodes of the rectifier bridge, avoiding the low input voltage loss caused by the conduction voltage drop of the rectifier bridge diodes and the conduction loss of the diodes.

Description

Technical Field

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

[0002] Driven by the demands of low-carbon environmental protection and Internet of Everything, the data sampling module at the environmental target point needs to achieve self-power supply. Specifically, to collect key information and digitize it under various complex environmental conditions, it is necessary to collect weak energy from the environment to flexibly achieve self-power supply for the sampling module at the environmental target point.

[0003] Currently, the self-power supply scheme for the sampling module mainly generates low-voltage alternating current through a small power generation device (which can be called an energy recovery device), such as 0.4, 0.7, 1.5V peak alternating current. Then, through an alternating current-direct current (AC-DC) power conversion circuit, a stable low voltage (such as 3.3V, 9V, 15V) output is achieved to supply power to 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 A traditional high-gain boost rectifier circuit using a diode rectifier bridge. This circuit mainly realizes the high-gain characteristic of the input-output voltage by multiplexing the switching tubes of the cascaded boost circuit. Although this traditional high-gain boost circuit can achieve high gain from the input to the output voltage, there are always two conducting diodes in its rectifier bridge. The two conducting rectifier bridge diodes have a large conduction voltage drop loss, making 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 traditional high-boost converter shown will not be able to work properly due to the too low input voltage.

[0005] To broaden the working range of the above-mentioned traditional quadratic high-boost converter and further improve the power conversion efficiency of the converter, the present invention proposes a high-gain bridge-less series output rectifier based on low-voltage energy recovery. By connecting the outputs of two conversion units in series, the present invention can further convert the low-voltage AC input into 15V direct current. This high-voltage direct current is more conducive to the remote pulling and raising of the subsequent antenna load (lower cable loss and better signal transmission effect) and rapid charging of the battery. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-gain bridge-less series output rectifier based on low-voltage energy recovery to solve problems such as the low power conversion efficiency of the traditional quadratic high-boost converter mentioned in the above background art.

[0007] To achieve the above purpose, the present invention is implemented by adopting the following technical solutions:

[0008] The present invention proposes a high-gain bridge-less series output rectifier based on low-voltage energy recovery. Its circuit includes an inductor L and rectifier diodes D R1 and rectifier diodes D R2 , diode D1, diode D2, complementary diode D S1 and complementary diode D S2 , switching tubes S1, S2, intermediate capacitor C m1 and intermediate capacitor C m2 , intermediate inductor L S1 and intermediate inductor L S2 , output diode D o1 and output diode D o2 , output capacitor C o1 and output capacitor C o2 ;

[0009] The rectifier diodes D R1 , diode D1, complementary diode D S1 , switching tube S1, intermediate capacitor C m1 , intermediate inductor L S1 constitute a first quadratic boost unit. The first quadratic boost unit cooperates with the inductor L, output diode D o1 , output capacitor C o1 and output capacitor C o2 for power conversion during the positive half input cycle of the alternating current;

[0010] The rectifier diodes D R2 , diode D2, complementary diode D S2 , switching tube S2, intermediate capacitor C m2 , intermediate inductor L S2 constitute a second quadratic boost unit. The second quadratic boost unit cooperates with the inductor L, output diode D o2 , output capacitor C o1 and output capacitor C o2 for power conversion during the negative half input cycle of the alternating current.

[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 anode of the rectifier diode D R1 and the cathode of the rectifier diode D R2 ;

[0012] The cathode of the rectifier diode D R1 is connected to the anode of the complementary diode D S1 and the anode of diode D1; the cathode of diode D1 is connected to the positive electrode of the intermediate capacitor C m1 and one end of the intermediate inductor L S1 , and the intermediate inductor L S1The other end of which is connected to the supplementary diode D S1 's cathode, the drain of the switching transistor S1, the anode of the output diode D o1 ; the cathode of the output diode D o1 is connected to the positive electrode of the output capacitor C o1 and one end of the load R L ;

[0013] The anode of the rectifying diode D R2 is connected to the cathode of the supplementary diode D S2 and the cathode of the diode D2; the anode of the diode D2 is connected to the negative electrode of the intermediate capacitor C m2 and one end of the intermediate inductor L S2 ; the other end of the intermediate inductor L S2 is connected to the anode of the supplementary diode D S2 , the source of the switching transistor S2, the cathode of the output diode D o2 ; the anode of the output diode D o2 is connected to the negative electrode of the output capacitor C o2 and the other end of the load R L ;

[0014] The other end of the input side is connected to the negative electrode of the intermediate capacitor C m1 , the positive electrode of the intermediate capacitor C m2 , the source of the switching transistor S1, the drain of the switching transistor S2, the negative electrode of the output capacitor C o1 , the positive electrode of the output capacitor C o2 ;

[0015] Preferably, the working modes during the positive half input cycle of the AC of the high-gain bridge-less series output rectifier are as follows:

[0016] Working mode 1: In this stage, the switching transistor S1 is in the conducting state, and the input terminal charges the inductor L through the rectifying diode D R1 , the supplementary diode D S1 and the switching transistor S1; meanwhile, the intermediate capacitor C m1 charges the inductor L through the switching transistor S1 S1 ; in this stage, the inductor current i L , the inductor current i LS1 rises linearly; the output capacitor C o1 , the output capacitor C o2 powers the load R L ;

[0017] Working mode 2: This stage starts when the switching transistor S1 is turned off; the diodes D1 and the rectifying diode D R1 conduct to provide a freewheeling path for the inductor current i L , and the inductor current i L charges the intermediate capacitor Cm1 Energize; meanwhile, the output diode D o1 provides a freewheeling path for the inductor current i LS1 and the inductor current i LS1 energizes the output capacitor C o1 and supplies energy to the load R L ; during this stage, the inductor current i L 、the inductor current i LS1 linearly decreases to zero, and the output capacitor C o2 continues to supply energy to the load R L ;

[0018] Operating mode 3: This stage starts when the inductor current i L 、the inductor current i LS1 linearly decreases to zero; the rectifier diode D R1 、diode D1, supplementary diode D S1 、switching transistor S1 and output diode D o1 are all in the off state; the output capacitor C o1 、the output capacitor C o2 continues to supply energy to the load R L ;

[0019] Preferably, the operating modes during the negative half - input cycle of the AC of the high - gain bridge - less series output rectifier are as follows:

[0020] Operating mode 4: During this stage, the switching transistor S2 is in the on state, and the input terminal, through the rectifier diode D R2 、supplementary diode D S2 and switching transistor S2, energizes the inductor L; meanwhile, the intermediate capacitor C m2 energizes the inductor L S2 through the switching transistor S2; during this stage, the inductor current i L 、the inductor current i LS2 linearly increases; the output capacitor C o1 、the output capacitor C o2 supplies energy to the load R L ;

[0021] Operating mode 5: This stage starts when the switching transistor S2 turns off; diode D2, rectifier diode D R2 conducts to provide a freewheeling path for the inductor current i L and the inductor current i L energizes the intermediate capacitor C m2 ; meanwhile, the output diode D o2 provides a freewheeling path for the inductor current i LS2 and the inductor current i LS2 energizes the output capacitor C o2 and supplies energy to the load R LPower supply; during this stage, the inductor current i L and the inductor current i LS2 linearly decrease to zero, and the output capacitor C o1 continues to supply power to the load R L .

[0022] Operating mode 6: This stage starts when the inductor current i L and the inductor current i LS2 linearly decrease to zero; the rectifier diode D R2 , diode D2, supplementary diode D S2 , switch tube S2 and output diode D o2 are all in the off state; the output capacitors C o1 and the output capacitors C o2 continue to supply power to the load R L .

[0023] Preferably, the driving of the switch tube S1 and the switch tube S2 is as follows:

[0024] The sampling signal of the output voltage V o is compared with the output reference voltage V o,ref , and then the error feedback signal is obtained through PI parameter adjustment. The error feedback signal is compared with the triangular wave to generate the output signal V comp1 of comparator 1;

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

[0026] V comp2 and V comp1 pass through the AND gate to generate the driving signal G S1 of the switch tube S1;

[0027] After V comp2 passes through the NOT gate, it passes through the AND gate with V comp1 to generate the driving signal G S2 of the switch tube S2.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

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

[0030] (2) Although the total number of devices in the present invention is increased compared with the traditional quadratic converter, by adopting the series connection of the outputs of two quadratic boost units, a higher output voltage gain is achieved, and the number of semiconductor conductions of the converter of the present invention is lower than that of the traditional quadratic high-boost converter, realizing a higher power conversion. Description of the Drawings

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

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

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

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

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

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

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

[0038] Figure 8 It is a waveform simulation diagram of the high-gain bridge-less series output rectifier in the present invention. Detailed Embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment 1:

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

[0042] Among them, rectifier diode D R , diode D, supplementary diode D S , switch transistor S, intermediate capacitor C m , intermediate inductor L S constitute a quadratic boost unit. Two quadratic boost units are formed in the high-gain bridge-less series output rectifier circuit, and the outputs of the two quadratic boost units are connected in series. Figure 2 is the schematic diagram of the high-gain bridge-less series output rectifier circuit in the present invention.

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

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

[0045] To illustrate the working principle of the high-gain bridge-less series output rectifier of the present invention, the system can be equivalently regarded as shown in Figure 3 and Figure 4 the circuit working mode diagrams.

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

[0047] From Figure 3 and Figure 4 's working modes, the waveforms of the key devices can be obtained. Figure 5 is the waveform diagram of the key devices of the bridge-less boost converter in the positive half cycle of the AC input, Figure 6 is the waveform diagram of the key devices of the converter in the negative half cycle of the AC input.

[0048] Working mode 1 [0, d on T S : In this stage, the switching transistor S1 is in the conducting state. The input terminal charges the inductor L through the rectifier diode D R1 , the supplementary diode D S1 and the switching transistor S1; at the same time, the intermediate capacitor C m1 charges the inductor L through the switching transistor S1 S1 . In this stage, the inductor current i L , the inductor current i LS1 rises linearly. The output capacitors C o1 , C o2 supply energy to the load R L .

[0049] Operating mode 2[d on T S ,d on T S +d of2 T S :When the switch S1 is turned off, operating mode 2 starts. The diode D1 and the rectifier diode D R1 conduct to provide a freewheeling path for the inductor current i L , and the inductor current i L charges the intermediate capacitor C m1 ; at the same time, the output diode D o1 provides a freewheeling path for the inductor current i LS1 , and the inductor current i LS1 charges the output capacitor C o1 and supplies energy to the load R L . During this stage, the inductor current i L , the inductor current i LS1 linearly decreases until it becomes zero, and the output capacitor C o2 continues to supply energy to the load R L .

[0050] Operating mode 3[d on T S +d of2 T S ,T S :When the inductor currents i L , i LS1 linearly decrease to zero, operating mode 3 starts. The rectifier diode D R1 , the diode D1, the auxiliary diode D S1 , the switch S1 and the output diode D o1 are all in the off state. The output capacitors C o1 , C o2 continue to supply energy to the load R L .

[0051] Operating mode 4[0,d on T S :During this stage, the switch S2 is in the on state. The input terminal charges the inductor L through the rectifier diode D R2 , the auxiliary diode D S2 and the switch S2; at the same time, the intermediate capacitor C m2 charges the inductor L S2 through the switch S2. During this stage, the inductor currents i L , i LS2 linearly increase. The output capacitors C o1 , C o2 supply energy to the load R L .

[0052] Operating mode 5[d on T S ,d on T S +d of2 T S :When the switch tube S2 is turned off, operating mode 5 starts. The diode D2 and the rectifier diode D R2 conduct to provide a freewheeling path for the inductor current i L , and the inductor current i L charges the intermediate capacitor C m2 ; at the same time, the output diode D o2 provides a freewheeling path for the inductor current i LS2 , and the inductor current i LS2 charges the output capacitor C o2 and supplies energy to the load R L . During this stage, the inductor current i L , the inductor current i LS2 linearly decreases to zero, and the output capacitor C o1 continues to supply energy to the load R L .

[0053] Operating mode 6[d on T S +d of2 T S ,T S :When the inductor currents i L , i LS2 linearly decrease to zero, operating mode 6 starts. The rectifier diode D R2 , the diode D2, the supplementary diode D S2 , the switch tube S2, and the output diode D o2 are all in the off state. The output capacitors C o1 , C o2 continue to supply energy to the load R L .

[0054] The specific control method of the high-gain bridge-less series output rectifier is as Figure 7 shown. The sampling signal of the output voltage V o is compared with the output reference voltage V o,ref , and then through PI parameter adjustment to obtain an error feedback signal. The error feedback signal is compared with a triangular wave to generate the output signal V comp1 of comparator 1. At the same time, the energy recovery low-voltage output device, as the input of the present invention, its input voltage v in sampling signal passes through the sampling circuit and then through comparator 2 to generate the output signal V comp2 of comparator 2.

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

[0056] V comp2 After passing through an inverter and then combined with V comp1 The driving signal G of the switching transistor S2 is generated through an AND gate S2 .

[0057] It should be noted that the high-gain bridge-less output series rectifier circuit of the present invention is mainly applied to the field of low-voltage energy recovery. Therefore, the input voltage of the circuit is low and the power conversion is small. Although the number of circuit devices in the present invention is large, each device has a low breakdown voltage requirement and a small power requirement, and still has the characteristic of low cost.

[0058] Experimental verification:

[0059] To verify the feasibility of the high-gain bridge-less series output rectifier in the present invention, the PSIM simulation software was used to simulate and verify the circuit. Specific parameters: The AC input uses a sine signal fitting, the peak value of the AC voltage is 1.4V, the frequency is 300Hz, the inductance L is 1.5uH, the intermediate inductance L S1 and the intermediate inductance L S2 is 4.8uH, the intermediate capacitor C m1 and the intermediate capacitor C m2 is 200uF, the output capacitor C o1 and the output capacitor C o2 is 100uF, the output voltage is 15V, the load R L is 4000Ω, the power is 56mW, the switching frequency is 47k, and in the PI parameters, P is 0.8 and I is 0.005. Note: A conduction voltage drop of 0.3V is set for all diodes in the circuit to verify the performance of the circuit in the present invention to achieve a 15V high-gain output under a low input voltage.

[0060] Figure 8 This is the waveform simulation diagram of the key device of the high-gain bridge-less series output rectifier in the present invention. As Figure 8 can be seen, under the condition of an AC input peak value of 1.4V and a frequency of 300Hz, the bridge-less boost converter achieves a regulated output of 15V. And the switching transistor S1 and the switching transistor S2 alternately operate in the positive and negative half-cycles of the input voltage v in , 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 in the present invention, and the simulation waveforms of each device are consistent with the Figure 5 and Figure 6 shown theoretical waveforms.

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

[0062] As described above, it is only used to help understand the method of the present invention and its core essence. However, the protection scope of the present invention is not limited thereto. For those of ordinary skill in the art within the technical scope disclosed by the present invention, any equivalent substitution or change made according to the technical solution and inventive concept of the present invention should be covered within the protection scope of the present invention. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A high-gain bridgeless series output rectifier based on low-voltage energy recovery, characterized in that: Its circuit includes an inductor L , Rectifier diode D R1 , Rectifier diode D R2 ,diode D 1. Diode D 2. Supplementary diode D S1 , Supplementary diode D S2 , switch tube S 1. Switching tube S 2. Intermediate capacitor C m1 、Intermediate capacitor C m2 , Intermediate inductor L S1 , Intermediate inductor 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 D 1. Supplementary diode D S1 , switch tube S 1. Intermediate capacitor C m1 , Intermediate inductor L S1 The first secondary boost unit is formed by combining an inductor L、 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 D 2. Supplementary diode D S2 , switch tube S 2. Intermediate capacitor C m2 , Intermediate inductor L S2 The second secondary boost unit is formed by combining an inductor L、 Output diode D o2 , output capacitor C o1 , output capacitor C o2 , used for power conversion in the negative half cycle of AC input; One end of the input side and the inductor L One end of the inductor is connected L The other end of 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 Anode, diode D 1 is connected to the anode of the diode D 1 cathode and middle 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 and switch tube S 1's drain, output diode D o1 The anode of the output diode is connected to D o1 The cathode and output capacitor C o1 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 D 2's cathode is connected; diode D 2 anode and middle 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 Anode, switch tube S 2 source, output diode D o2 The cathode of the output diode is connected to D o2 The anode and output capacitor C o2 Negative electrode, load R L The other end is connected; The other end of the input side and the middle capacitor C m1 The negative electrode and the middle capacitor C m2 The positive electrode and switch tube S 1 source, switch tube S 2 drain, output capacitance C o1 The negative pole of the output capacitor C o2 The positive pole is connected.

2. The high-gain bridgeless series output rectifier based on low-voltage energy recovery according to claim 1, 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 S 1 is in the on state, the input terminal passes through the rectifier diode D R1 , Supplementary diode D S1 And switch tube S 1. To inductor L Charging; at the same time, the middle capacitor C m1 Through the switch tube S 1-way inductor L S1 Charging; at this stage, the inductor current i L , inductor current i LS1 Linear rise; output capacitance C o1 , output capacitor C o2 For load R L Energy supply; Working mode 2: When the switch tube S 1 turns off when this phase begins; the diode D 1. Rectifier diode D R1 The inductor 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 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 decreases linearly until it reaches zero. 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 decrease reaches zero; the rectifier diode D R1 ,diode D 1. Supplementary diode D S1 , switch tube S 1 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.

3. The high-gain bridgeless series output rectifier based on low-voltage energy recovery according to claim 2, 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 S 2 is in the on state, the input end passes through the rectifier diode D R2 , Supplementary diode D S2 And switch tube S 2. To inductor L Charging; at the same time, the middle capacitor C m2 Through the switch tube S 2-way inductor L S2 Charging; at this stage, the inductor current i L , inductor current i LS2 Linear rise; output capacitance C o1 , output capacitor C o2 For load R L Energy supply; Working mode 5: When the switch tube S 2 This phase starts when the diode is turned off; D 2. Rectifier diode D R2 The inductor 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 Output capacitor C o2 Charging and Loading R L Energy supply; At this stage, the inductor current i L , inductor current i LS2 The output capacitance decreases linearly until it reaches zero. 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 decrease reaches zero; the rectifier diode D R2 ,diode D 2. Supplementary diode D S2 , switch tube S 2 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.

4. The high-gain bridgeless series output rectifier based on low-voltage energy recovery according to claim 2 or 3, characterized in that: The switch tube S 1 and switch tube S 2's driver 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 of comparator 1. V comp1 ; At the same time, the input voltage on the input side v in The sampling signal passes through the sampling circuit and then through comparator 2 to generate the output signal of comparator 2. V comp2 ; V comp2 and V comp1 The switch tube is generated by the AND gate S 1 driving signal G S1 ; V comp2 After passing through the NOT gate, V comp1 The switch tube is generated by the AND gate S 2 driving signal G S2 .

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