Isolation type extensible high-gain rectifying circuit

Abstract

The utility model provides an isolation type extensible high-gain rectifying circuit which comprises an alternating current input source us, a three-winding transformer T, two auxiliary capacitors CP1 and CP2, two auxiliary diodes DP1 and DP2 and 2n extension units. According to the utility model, the output voltage of the circuit can be effectively improved, and the defects caused by the adoption of a high transformer turn ratio for realizing large voltage gain are avoided. The expansion unit structure can realize high boost of the converter, the voltage gain is adjustable, the converter is more suitable for high boost occasions, and different numbers of expansion units are adopted, so that different boost requirements are realized, and the applicability of the circuit is effectively expanded.

Description

Technical Field

[0001] The utility model relates to an AC-DC circuit, in particular to an isolated expandable high-gain rectifier circuit. Background Art

[0002] At present, wind power generation is widely used in the power industry. Wind power generation mostly uses AC fans, and its output AC power needs to be rectified and boosted before being transmitted to the DC bus for remote supply. However, the boosting capacity of traditional rectification schemes is limited, and the output voltage can only be increased by increasing the transformer turns ratio, which leads to large rectification circuit size, high cost and low efficiency. In order to improve the disadvantages of traditional rectifier circuits, for example, the patent application publication number CN116995940A discloses a high-efficiency isolated ACDC circuit, controller and control method, and storage medium. The circuit includes a switch network, a resonant isolation network, and a rectifier network. The three-phase resonant bridge arm takes energy from the three-phase AC input through three bidirectional switches connected thereto, and the input current waveform tracks the input voltage waveform to achieve active power factor correction, which not only minimizes the number of devices and greatly improves the power conversion efficiency, but also meets the needs of higher power level design and wider output voltage range. The input current and output current ripples are greatly reduced through three-phase interleaving, so that the input and output filters can be greatly reduced, and the power density of the power supply can be significantly improved; further, the two switch tubes of the bidirectional switch follow the positive and negative characteristics of the phase voltage corresponding to the bidirectional switch and are driven separately, which can achieve zero voltage opening, and can further greatly improve the ACDC conversion efficiency. However, the circuit has a low voltage gain, which is difficult to adapt to the high boost requirements in different scenarios, and the structure contains more active switches, the control method is complex, and the resonant structure has high requirements for parameter design, which greatly limits the application of the rectifier circuit. Utility Model Content

[0003] In order to solve the technical problems of low voltage gain, insufficient voltage boosting capability and small adjustable range of voltage gain in traditional rectifier circuits, the utility model provides an isolated and expandable high-gain rectifier circuit, which can improve voltage gain while achieving rectification and has multi-level gain adjustment capability.

[0004] The technical solution adopted by the utility model is:

[0005] An isolated expandable high-gain rectifier circuit, characterized in that: the circuit comprises an AC input source u s , a three-winding transformer T, 2 auxiliary capacitors C P1 , C P2 , 2 auxiliary diodes D P1 , D P2 , 2n expansion units, n is a natural number, the value range is n≥1; where:

[0006] The three-winding transformer T includes the primary winding T P , secondary winding T S1 and the secondary winding T S2 , AC input source u s The upper end is connected to the primary winding A of the three-winding transformer T, and the AC input source u s The lower end of is connected to the primary winding B end of the three-winding transformer T, and the first auxiliary capacitor C P1 The left end is connected to the secondary winding D of the three-winding transformer T, and the first auxiliary capacitor C P1 The right end is connected to the first auxiliary diode D P1 The anode of the first auxiliary diode D P1 The cathode of the three-winding transformer T is connected to the secondary winding C, and the second auxiliary capacitor C P2 The left end is connected to the secondary winding D' end of the three-winding transformer T, and the second auxiliary capacitor C P2 The right end is connected to the second auxiliary diode D P2 The anode of the second auxiliary diode D P2 The cathode is connected to the secondary winding C' end of the three-winding transformer T;

[0007] Each expansion unit has the same structure, including a left capacitor, a right capacitor, an upper diode, and a lower diode. The connection form is as follows:

[0008] When n=1, the left capacitor C of the first expansion unit 12 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C 12 The right end of the upper diode D 11 The anode and lower side of diode D 12 The cathode connection of the lower diode D 12 The anode of the three-winding transformer T is connected to the secondary winding D, and the capacitor C on the right is connected to the secondary winding D of the three-winding transformer T. 11 The upper end of the upper diode D 11 The cathode connection of the right capacitor C 11 The lower end of the diode D 12 The anode of the second expansion unit is connected to form the first expansion unit; the capacitor C on the left side of the second expansion unit 22 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C 22 The right end of the upper diode D 21 The anode and lower side of diode D 22 The cathode connection of the lower diode D 22 The anode of the three-winding transformer T is connected to the secondary winding D' end, and the capacitor C on the right is connected to the secondary winding D' end of the three-winding transformer T. 21 The upper end of the upper diode D 21The cathode connection of the right capacitor C 21 The lower end of the diode D 22 The anode of is connected to form the second expansion unit;

[0009] When n>1, among the 2n expansion units, the 2n-1th expansion unit contains the left capacitor C (2n-1)2 、The right capacitor C (2n-1)1 , upper diode D (2n-1)1 , lower diode D (2n-1)2 ; Among them, the left capacitor C of the 2n-1th expansion unit (2n-1)2 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C (2n-1)2 The right end of the upper diode D (2n-1)1 The anode and lower side of diode D (2n-1)2 The cathode connection of the lower diode D (2n-1)2 The anode of the 2n-3rd expansion unit is connected to the upper side diode D (2n-3)1 The cathode connection of the right capacitor C (2n-1)1 The upper end of the upper diode D (2n-1)1 The cathode connection of the right capacitor C (2n-1)1 The lower end of the diode D (2n-1)2 The anode connection of the 2n expansion units; among the 2n expansion units, the 2nth expansion unit contains the left capacitor C (2n)2 、The right capacitor C (2n)1 , upper diode D (2n)1 , lower diode D (2n)2 ; Among them, the left capacitor C of the 2nth expansion unit (2n)2 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C (2n)2 The right end of the upper diode D (2n)1 The anode and lower side of diode D (2n)2 The cathode connection of the lower diode D (2n)2 The anode of the second (n-1) expansion unit and the upper side diode D 2(n-1)1 The cathode connection of the right capacitor C (2n)1 The upper end of the upper diode D (2n)1 The cathode and the first auxiliary capacitor C P1 The right end is connected to the capacitor C (2n)1 The lower end of the diode D (2n)2 Anode connection;

[0010] The two ends of the load R are connected to the capacitor C in the 2n-1th expansion unit. (2n-1)1 The upper end and the second auxiliary capacitor C P2 The right end is connected.

[0011] When n = 2, 4 expansion units are used, the AC input source u s When the current flows out from the upper end, the upper diode D of the first expansion unit 11 , the upper diode D of the second expansion unit 21 , the upper diode D of the third expansion unit 31 , the upper diode D of the 4th expansion unit 41 Conducting, 2 auxiliary diodes D P1 , D P2 and the lower diode D of the first expansion unit 12 , the lower diode D of the second expansion unit 22 , the lower diode D of the third expansion unit 32 , the lower diode D of the 4th expansion unit 42 Shutdown, 2 auxiliary capacitors C P1 , C P2 and the right capacitor C of the first expansion unit 11 , the right capacitor C of the second expansion unit 21 , the right capacitor C of the third expansion unit 31 , the right capacitor C of the fourth expansion unit 41 Charging, AC input source s The left capacitor C of the first expansion unit 12 , the left capacitor C of the second expansion unit 22 , the left capacitor C of the third expansion unit 32 , the left capacitor C of the 4th expansion unit 42 The discharge provides power to the load.

[0012] When n = 2, 4 expansion units are used, the AC input source u s When the current flows out from the bottom, the upper diode D of the first expansion unit 11 , the upper diode D of the second expansion unit 21 , the upper diode D of the third expansion unit 31 , the upper diode D of the 4th expansion unit 41 Shutdown, 2 auxiliary diodes D P1 , D P2 and the lower diode D of the first expansion unit 12 , the lower diode D of the second expansion unit 22 , the lower diode D of the third expansion unit 32 , the lower diode D of the 4th expansion unit 42 Conduction, AC input source u s With two auxiliary capacitors C P1 , C P2 and the right capacitor C of the first expansion unit11 、The right side capacitor C of the second expansion unit 21 , the right capacitor C of the third expansion unit 31 , the right capacitor C of the fourth expansion unit 41 Discharge to supply power to the load, the left capacitor C of the first expansion unit 12 , the left capacitor C of the second expansion unit 22 , the left capacitor C of the third expansion unit 32 , the left capacitor C of the 4th expansion unit 42 Charge.

[0013] The output voltage of the isolated expandable high-gain rectifier circuit of the utility model is adjusted by adjusting the number of expansion units to achieve high-gain multi-stage voltage regulation capability. Each expansion unit can increase the voltage gain by 2, and the input and output voltage gain of the rectifier circuit is N. 1 (2n+1)+N 2 (2n+1), where N 1 The secondary winding T of the three-winding transformer S1 With the primary winding T P Turns ratio, N 2 The secondary winding T of the three-winding transformer S2 With the primary winding T P Turns ratio.

[0014] The utility model provides an isolated and expandable high-gain rectifier circuit, and the technical effects are as follows:

[0015] 1) It can effectively improve the output voltage of the circuit and avoid the disadvantages of using a high transformer turns ratio to achieve a larger voltage gain.

[0016] 2) The utility model adds an expansion unit to achieve high voltage boost of the converter, and the voltage gain is adjustable, which is more suitable for high voltage boost occasions.

[0017] 3) The utility model can adopt different numbers of expansion units according to specific application scenarios, so as to achieve different boosting requirements, effectively expanding the applicability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0019] Figure 1 It is a specific circuit principle diagram of the utility model containing 4 expansion units.

[0020] Figure 2 This is a specific circuit schematic diagram containing n expansion units mentioned in the utility model.

[0021] Figure 3The utility model contains 4 expansion units under the input voltage of 100V, N 1 =N 2 =1 when the input and output voltage simulation diagram. DETAILED DESCRIPTION

[0022] Figure 1 An isolated expandable high gain rectifier circuit shown includes an AC input source u s , a three-winding transformer T, 2 auxiliary capacitors C P1 , C P2 , 2 auxiliary diodes D P1 , D P2 , 4 expansion units, that is, in this embodiment, n=2; wherein:

[0023] The three-winding transformer T includes the primary winding T P , secondary winding T S1 and the secondary winding T S2 , AC input source u s The upper end is connected to the primary winding A of the three-winding transformer T, and the AC input source u s The lower end of is connected to the primary winding B end of the three-winding transformer T, and the first auxiliary capacitor C P1 The left end is connected to the secondary winding D of the three-winding transformer T, and the first auxiliary capacitor C P1 The right end is connected to the first auxiliary diode D P1 The anode of the first auxiliary diode D P1 The cathode of the three-winding transformer T is connected to the secondary winding C, and the second auxiliary capacitor C P2 The left end is connected to the secondary winding D' end of the three-winding transformer T, and the second auxiliary capacitor C P2 The right end is connected to the second auxiliary diode D P2 The anode of the second auxiliary diode D P2 The cathode of is connected to the secondary winding C' end of the three-winding transformer T.

[0024] The four expansion units have the same structure, each containing a left capacitor, a right capacitor, an upper diode, and a lower diode. The connection form is as follows:

[0025] The first expansion unit contains the left capacitor C 12 、The right capacitor C 11 , upper diode D 11 , lower diode D 12 ; Among them, the left capacitor C of the first expansion unit 12 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C 12 The right end of the upper diode D 11The anode and lower side of diode D 12 The cathode connection of the lower diode D 12 The anode of the three-winding transformer T is connected to the secondary winding D, and the capacitor C on the right is connected to the secondary winding D of the three-winding transformer T. 11 The upper end of the upper diode D 11 The cathode connection of the right capacitor C 11 The lower end of the diode D 12 The anode of the MOSFET is connected to form the first expansion unit.

[0026] The second expansion unit contains the left capacitor C 22 、The right capacitor C 21 , upper diode D 21 , lower diode D 22 ; Among them, the capacitor C on the left side of the second expansion unit 22 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C 22 The right end of the upper diode D 21 The anode and lower side of diode D 22 The cathode connection of the lower diode D 22 The anode of the three-winding transformer T is connected to the secondary winding D' end, and the capacitor C on the right is connected to the secondary winding D' end of the three-winding transformer T. 21 The upper end of the upper diode D 21 The cathode connection of the right capacitor C 21 The lower end of the diode D 22 The anode of the MOSFET is connected to form a second expansion unit.

[0027] The third expansion unit contains the left capacitor C 32 、The right capacitor C 31 , upper diode D 31 , lower diode D 32 ; Among them, the capacitor C on the left side of the third expansion unit 32 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C 32 The right end of the upper diode D 31 The anode and lower side of diode D 32 The cathode connection of the lower diode D 32 The anode of the first expansion unit is connected to the upper side diode D 11 The cathode connection of the right capacitor C 11 The lower end of the diode D 12 The anode of the MOSFET is connected to form the third expansion unit.

[0028] The fourth expansion unit contains the left capacitor C 42 、The right capacitor C 41 , upper diode D 41 , lower diode D42 ; Among them, the capacitor C on the left side of the 4th expansion unit 42 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C 42 The right end of the upper diode D 41 The anode and lower side of diode D 42 The cathode connection of the lower diode D 42 The anode of the second expansion unit is connected to the upper side diode D 21 The cathode connection of the right capacitor C 41 The upper end of the upper diode D 41 The cathode and the first auxiliary capacitor C P1 The right end is connected to the capacitor C 41 The lower end of the diode D 42 The anode of the 4th expansion unit is connected.

[0029] The two ends of the load R are connected to the capacitor C in the third expansion unit. 31 The upper end and the second auxiliary capacitor C P2 The right end is connected.

[0030] At the AC input source u s When the current flows out from the upper end, the diode D 11 , D 21 , D 31 , D 41 Conducting, diode D P1 , D P2 and diode D 12 , D 22 , D 32 , D 42 Shutdown, auxiliary capacitor C P1 , C P2 and the first expansion unit capacitor C 11 , the second expansion unit capacitor C 21 , the third expansion unit capacitor C 31 , the fourth expansion unit capacitor C 41 Charging, AC input source s With the first expansion unit capacitor C 12 , the second expansion unit capacitor C 22 , the third expansion unit capacitor C 32 , the fourth expansion unit capacitor C 42 Discharge to power the load. s When the current flows out from the lower end, the diode D 11 , D 21 , D 31 , D 41 Turn off, diode D P1 , DP2 and diode D 12 , D 22 , D 32 , D 42 Conduction, AC input source u s With auxiliary capacitor C P1 , C P2 and the first expansion unit capacitor C 11 , the second expansion unit capacitor C 21 , the third expansion unit capacitor C 31 , the fourth expansion unit capacitor C 41 Discharge to supply power to the load, the first expansion unit capacitor C 12 , the second expansion unit capacitor C 22 , the third expansion unit capacitor C 32 , the fourth expansion unit capacitor C 42 Charge.

[0031] Figure 2 An isolated expandable high gain rectifier circuit shown includes an AC input source u s , a three-winding transformer T, 2 auxiliary capacitors C P1 , C P2 , 2 auxiliary diodes D P1 , D P2 , 2n expansion units, n is a natural number, the value range is n≥1; where:

[0032] The three-winding transformer T includes the primary winding T P , secondary winding T S1 and the secondary winding T S2 , AC input source u s The upper end is connected to the primary winding A of the three-winding transformer T, and the AC input source u s The lower end of is connected to the primary winding B end of the three-winding transformer T, and the first auxiliary capacitor C P1 The left end is connected to the secondary winding D of the three-winding transformer T, and the first auxiliary capacitor C P1 The right end is connected to the first auxiliary diode D P1 The anode of the first auxiliary diode D P1 The cathode of the three-winding transformer T is connected to the secondary winding C, and the second auxiliary capacitor C P2 The left end is connected to the secondary winding D' end of the three-winding transformer T, and the second auxiliary capacitor C P2 The right end is connected to the second auxiliary diode D P2 The anode of the second auxiliary diode D P2 The cathode of is connected to the secondary winding C' end of the three-winding transformer T.

[0033] Each expansion unit has the same structure, including a left capacitor, a right capacitor, an upper diode, and a lower diode. The connection form is as follows:

[0034] The first expansion unit contains the left capacitor C 12 、The right capacitor C 11 , upper diode D 11 , lower diode D 12 ; Among them, the left capacitor C of the first expansion unit 12 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C 12 The right end of the upper diode D 11 The anode and lower side of diode D 12 The cathode connection of the lower diode D 12 The anode of the three-winding transformer T is connected to the secondary winding D, and the capacitor C on the right is connected to the secondary winding D of the three-winding transformer T. 11 The upper end of the upper diode D 11 The cathode connection of the right capacitor C 11 The lower end of the diode D 12 The anode of the MOSFET is connected to form the first expansion unit.

[0035] The second expansion unit contains the left capacitor C 22 、The right capacitor C 21 , upper diode D 21 , lower diode D 22 ; Among them, the capacitor C on the left side of the second expansion unit 22 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C 22 The right end of the upper diode D 21 The anode and lower side of diode D 22 The cathode connection of the lower diode D 22 The anode of the three-winding transformer T is connected to the secondary winding D' end, and the capacitor C on the right is connected to the secondary winding D' end of the three-winding transformer T. 21 The upper end of the upper diode D 21 The cathode connection of the right capacitor C 21 The lower end of the diode D 22 The anode of the MOSFET is connected to form a second expansion unit.

[0036] When n>1, among the 2n expansion units, the 2n-1th expansion unit contains the left capacitor C (2n-1)2 、The right capacitor C (2n-1)1 , upper diode D (2n-1)1 , lower diode D (2n-1)2 ; Among them, the left capacitor C of the 2n-1th expansion unit (2n-1)2 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C(2n-1)2 The right end of the upper diode D (2n-1)1 The anode and lower side of diode D (2n-1)2 The cathode connection of the lower diode D (2n-1)2 The anode of the n-3rd expansion unit is connected to the upper side diode D (2n-3)1 The cathode connection of the right capacitor C (2n-1)1 The upper end of the upper diode D (2n-1)1 The cathode connection of the right capacitor C (2n-1)1 The lower end of the diode D (2n-1)2 The anode connection of the 2nth expansion unit contains the left capacitor C (2n)2 、The right capacitor C (2n)1 , upper diode D (2n)1 , lower diode D (2n)2 ; Among them, the left capacitor C of the 2nth expansion unit (2n)2 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C (2n)2 The right end of the upper diode D (2n)1 The anode and lower side of diode D (2n)2 The cathode connection of the lower diode D (2n)2 The anode of the second (n-1) expansion unit and the upper side diode D 2(n-1)1 The cathode connection of the right capacitor C (2n)1 The upper end of the upper diode D (2n)1 The cathode and the first auxiliary capacitor C P1 The right end is connected to the capacitor C (2n)1 The lower end of the diode D (2n)2 Anode connection;

[0037] The two ends of the load R are connected to the capacitor C in the 2n-1th expansion unit. (2n-1)1 The upper end and the second auxiliary capacitor C P2 The right end is connected.

[0038] The output voltage of the isolated expandable high-gain rectifier circuit of the utility model is adjusted by adjusting the number of expansion units to achieve high-gain multi-stage voltage regulation capability. Each expansion unit can increase the voltage gain by 2, and the input and output voltage gain of the rectifier circuit is N. 1 (2n+1)+N 2 (2n+1). Where N 1 The secondary winding T of the three-winding transformer S1 With the primary winding T P Turns ratio, N 2 The secondary winding T of the three-winding transformer S2 With the primary winding T P Turns ratio.

[0039] Depend on Figure 3 It can be seen that the proposed expansion unit contains 4 expansion units, when the input voltage is 100V, N 1 =N 2 When =1, the output voltage is 1000V, achieving a 10-fold voltage gain, effectively improving the voltage gain of the circuit.

[0040] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the protection scope of the present invention.

[0041] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0042] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "left", "right", "upper", "lower", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The terms "first", "second", "1st", "2nd", "3rd", "4th" are also used only for the sake of brevity in the description, and do not indicate or imply relative importance.

Claims

1. An isolated, scalable high-gain rectifier circuit, characterized in that: The circuit contains an AC input source u s , a three-winding transformer T, 2 auxiliary capacitors C P1 , C P2 , 2 auxiliary diodes D P1 , D P2 , 2n expansion units, n is a natural number, the value range is n≥1; where: The three-winding transformer T includes the primary winding T P , secondary winding T S1 and the secondary winding T S2 , AC input source u s The upper end is connected to the primary winding A of the three-winding transformer T, and the AC input source u s The lower end of is connected to the primary winding B end of the three-winding transformer T, and the first auxiliary capacitor C P1 The left end is connected to the secondary winding D of the three-winding transformer T, and the first auxiliary capacitor C P1 The right end is connected to the first auxiliary diode D P1 The anode of the first auxiliary diode D P1 The cathode of the three-winding transformer T is connected to the secondary winding C, and the second auxiliary capacitor C P2 The left end is connected to the secondary winding D' end of the three-winding transformer T, and the second auxiliary capacitor C P2 The right end is connected to the second auxiliary diode D P2 The anode of the second auxiliary diode D P2 The cathode is connected to the secondary winding C' end of the three-winding transformer T; Each expansion unit has the same structure, including a left capacitor, a right capacitor, an upper diode, and a lower diode. The connection form is as follows: When n=1, the left capacitor C of the first expansion unit 12 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C 12 The right end of the upper diode D 11 The anode and lower side of diode D 12 The cathode connection of the lower diode D 12 The anode of the three-winding transformer T is connected to the secondary winding D, and the capacitor C on the right is connected to the secondary winding D of the three-winding transformer T. 11 The upper end of the upper diode D 11 The cathode connection of the right capacitor C 11 The lower end of the diode D 12 The anode of the second expansion unit is connected to form the first expansion unit; the capacitor C on the left side of the second expansion unit 22 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C 22 The right end of the upper diode D 21 The anode and lower side of diode D 22 The cathode connection of the lower diode D 22 The anode of the three-winding transformer T is connected to the secondary winding D' end, and the capacitor C on the right is connected to the secondary winding D' end of the three-winding transformer T. 21 The upper end of the upper diode D 21 The cathode connection of the right capacitor C 21 The lower end of the diode D 22 The anode of is connected to form the second expansion unit; When n>1, among the 2n expansion units, the 2n-1th expansion unit contains the left capacitor C (2n-1)2 、The right capacitor C (2n-1)1 , upper diode D (2n-1)1 , lower diode D (2n-1)2 ; Among them, the left capacitor C of the 2n-1th expansion unit (2n-1)2 The left end is connected to the secondary winding C of the three-winding transformer T, and the left capacitor C (2n-1)2 The right end of the upper diode D (2n-1)1 The anode and lower side of diode D (2n-1)2 The cathode connection of the lower diode D (2n-1)2 The anode of the 2n-3rd expansion unit is connected to the upper side diode D (2n-3)1 The cathode connection of the right capacitor C (2n-1)1 The upper end of the upper diode D (2n-1)1 The cathode connection of the right capacitor C (2n-1)1 The lower end of the diode D (2n-1)2 The anode connection of the 2n expansion units; among the 2n expansion units, the 2nth expansion unit contains the left capacitor C (2n)2 、The right capacitor C (2n)1 , upper diode D (2n)1 , lower diode D (2n)2 ; Among them, the left capacitor C of the 2nth expansion unit (2n)2 The left end is connected to the secondary winding C' end of the three-winding transformer T, and the left capacitor C (2n)2 The right end of the upper diode D (2n)1 The anode and lower side of diode D (2n)2 The cathode connection of the lower diode D (2n)2 The anode of the second (n-1) expansion unit and the upper side diode D 2(n-1)1 The cathode connection of the right capacitor C (2n)1 The upper end of the upper diode D (2n)1 The cathode and the first auxiliary capacitor C P1 The right end is connected to the capacitor C (2n)1 The lower end of the diode D (2n)2 Anode connection; The two ends of the load R are connected to the capacitor C in the 2n-1th expansion unit. (2n-1)1 The upper end and the second auxiliary capacitor C P2 The right end is connected.

2. An isolated scalable high-gain rectifier circuit according to claim 1, characterized in that: When n = 2, 4 expansion units are used, the AC input source u s When the current flows out from the upper end, the upper diode D of the first expansion unit 11 , the upper diode D of the second expansion unit 21 , the upper diode D of the third expansion unit 31 , the upper diode D of the 4th expansion unit 41 Conducting, 2 auxiliary diodes D P1 , D P2 and the lower diode D of the first expansion unit 12 , the lower diode D of the second expansion unit 22 , the lower diode D of the third expansion unit 32 , the lower diode D of the 4th expansion unit 42 Shutdown, 2 auxiliary capacitors C P1 , C P2 and the right capacitor C of the first expansion unit 11 , the right capacitor C of the second expansion unit 21 , the right capacitor C of the third expansion unit 31 , the right capacitor C of the fourth expansion unit 41 Charging, AC input source s The left capacitor C of the first expansion unit 12 , the left capacitor C of the second expansion unit 22 , the left capacitor C of the third expansion unit 32 , the left capacitor C of the 4th expansion unit 42 The discharge provides power to the load.

3. According to claim 1, an isolated scalable high-gain rectifier circuit is characterized in that: When n = 2, 4 expansion units are used, the AC input source u s When the current flows out from the bottom, the upper diode D of the first expansion unit 11 , the upper diode D of the second expansion unit 21 , the upper diode D of the third expansion unit 31 , the upper diode D of the 4th expansion unit 41 Shutdown, 2 auxiliary diodes D P1 , D P2 and the lower diode D of the first expansion unit 12 , the lower diode D of the second expansion unit 22 , the lower diode D of the third expansion unit 32 , the lower diode D of the 4th expansion unit 42 Conduction, AC input source u s With two auxiliary capacitors C P1 , C P2 and the right capacitor C of the first expansion unit 11 、The right side capacitor C of the second expansion unit 21 , the right capacitor C of the third expansion unit 31 , the right capacitor C of the fourth expansion unit 41 Discharge to supply power to the load, the left capacitor C of the first expansion unit 12 , the left capacitor C of the second expansion unit 22 , the left capacitor C of the third expansion unit 32 , the left capacitor C of the 4th expansion unit 42 Charge.

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