Aging system of feedback type power supply module

Abstract

The utility model discloses an aging system of feedback type power supply modules, comprising a first to-be-aged feedback type power supply module and a second to-be-aged feedback type power supply module, the three-phase AC ends of the first and second to-be-aged feedback type power supply modules are connected with the three-phase AC end of a power distribution cabinet through an inductor; the positive pole of the direct current bus of the first to-be-aged feedback type power supply module is connected with the positive pole of the direct current bus of the second to-be-aged feedback type power supply module through the first diode, and the negative pole of the direct current bus of the first to-be-aged feedback type power supply module is connected with the negative pole of the direct current bus of the second to-be-aged feedback type power supply module through the second diode. According to the utility model, one to-be-aged feedback type power supply module outputs power, and the other to-be-aged feedback type power supply module performs energy feedback and load simulation to form an energy circulation system, so that the two feedback type power supply modules are aged at the same time, and electric energy converted in the aging process is fed back to a three-phase alternating current power grid; therefore, the aging purposes of high efficiency, low energy consumption and low cost are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power electronics, and in particular relates to an aging system for a feedback power supply module. Background Art

[0002] When developing and producing power modules, aging testing is an important step, which can expose defects in components, welding, assembly and other hidden dangers in the production process in advance to ensure the reliability and stability of power products.

[0003] Usually, the aging method of the regenerative power supply module generally adopts the method of energy consumption by resistance, and the energy is consumed in the form of heat, resulting in a large amount of energy waste.

[0004] In order to solve the problem of high energy consumption in traditional aging methods for high-power power supply products, a regenerative electronic load is used to feed energy back to the grid to reduce energy consumption, but the investment cost also increases. Usually, a regenerative electronic load can only provide aging test for one high-power power supply, and the aging test efficiency is low. Utility Model Content

[0005] The purpose of the utility model is to overcome at least one defect in the prior art and provide an aging system for a regenerative power supply module. The aging system utilizes the characteristics of the regenerative power supply module itself to achieve power output of one regenerative power supply module to be aged and energy feedback and load simulation of another regenerative power supply module to be aged, thereby forming an energy circulation system. The two regenerative power supply modules are aged at the same time and the electric energy converted in the aging process is fed back to the three-phase AC power grid, so as to achieve the purpose of high-efficiency, low-energy consumption and low-cost aging.

[0006] The technical solution of the utility model is implemented as follows: the utility model discloses an aging system for a feedback power module, including a first feedback power module to be aged and a second feedback power module to be aged, the three-phase AC terminals U, V, and W of the first feedback power module to be aged are respectively connected to the three-phase AC terminals L1, L2, and L3 of a power supply device via a first AC side inductor, the three-phase AC terminals U, V, and W of the second feedback power module to be aged are respectively connected to the three-phase AC terminals L1, L2, and L3 of the power supply device via a second AC side inductor, the DC bus positive electrode P terminal of the first feedback power module to be aged is connected to the DC bus positive electrode P terminal of the second feedback power module to be aged via a first diode D1, and the DC bus negative electrode N terminal of the first feedback power module to be aged is connected to the DC bus negative electrode N terminal of the second feedback power module to be aged via a second diode D2.

[0007] Further, when the DC bus P and N terminal voltage U1 of the first aged regenerative power module is greater than the DC bus P and N terminal voltage U2 of the second aged regenerative power module, the second aged regenerative power module and the second AC side inductor form a buck step-down circuit;

[0008] When the DC bus P and N terminal voltage U1 of the first aged regenerative power module is less than the DC bus P and N terminal voltage U2 of the second aged regenerative power module, the first aged regenerative power module and the first AC side inductor form a buck step-down circuit.

[0009] Furthermore, a first autocoupler is connected between the first AC side inductor and the three-phase AC terminals L1, L2, L3 of the power supply device, or / and a second autocoupler is connected between the second AC side inductor and the three-phase AC terminals L1, L2, L3 of the power supply device.

[0010] Furthermore, a first control switch is connected between the three-phase AC terminals U, V, W of the first aged regenerative power module and the three-phase AC terminals L1, L2, L3 of the power supply device.

[0011] Further, the second ends T2, T4, and T6 of the first control switch are respectively connected to the first ends R, S, and T of the first AC side inductor, the second ends X, Y, and Z of the first AC side inductor are respectively connected to the three-phase AC ends U, V, and W of the first aged feedback power supply module, and the first ends T1, T2, and T3 of the first control switch are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device or the second ends a, b, and c of the first autocoupler. When the first ends T1, T2, and T3 of the first control switch are respectively connected to the second ends a, b, and c of the first autocoupler, the first ends A, B, and C of the first autocoupler are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device.

[0012] Furthermore, a second control switch is connected between the three-phase AC terminals U, V, W of the second aged feedback power module and the three-phase AC terminals L1, L2, L3 of the power supply device.

[0013] Further, the second ends T2, T4, and T6 of the second control switch are respectively connected to the first ends R, S, and T of the second AC side inductor, the second ends X, Y, and Z of the second AC side inductor are respectively connected to the three-phase AC ends U, V, and W of the second aged feedback power supply module, and the first ends T1, T2, and T3 of the second control switch are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device or the second ends a, b, and c of the second autovoltage regulator. When the first ends T1, T2, and T3 of the second control switch are respectively connected to the second ends a, b, and c of the second autovoltage regulator, the first ends A, B, and C of the second autovoltage regulator are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device.

[0014] Further, the power supply device includes a distribution cabinet, and the three-phase AC terminals U, V, and W of the first regenerative power supply module to be aged are connected to the three-phase AC terminals L1, L2, and L3 of the distribution cabinet at least via the first AC side inductor, and are connected to the three-phase AC power grid through the distribution cabinet, and the three-phase AC terminals U, V, and W of the second regenerative power supply module to be aged are connected to the three-phase AC terminals L1, L2, and L3 of the distribution cabinet at least via the second AC side inductor, and are connected to the three-phase AC power grid through the distribution cabinet.

[0015] Further, when the first regenerative power supply module to be aged operates in a rectifying state and the second regenerative power supply module to be aged operates in an inverting state, the anode of the first diode D1 is connected to the positive P terminal of the DC bus of the first regenerative power supply module to be aged, the cathode of the first diode D1 is connected to the positive P terminal of the DC bus of the second regenerative power supply module to be aged, the anode of the second diode D2 is connected to the negative N terminal of the DC bus of the second regenerative power supply module to be aged, and the cathode of the second diode D2 is connected to the negative N terminal of the DC bus of the first regenerative power supply module to be aged.

[0016] Further, when the first regenerative power supply module to be aged operates in an inverter state and the second regenerative power supply module to be aged operates in a rectifying state, the anode of the first diode D1 is connected to the positive P terminal of the DC bus of the second regenerative power supply module to be aged, the cathode of the first diode D1 is connected to the positive P terminal of the DC bus of the first regenerative power supply module to be aged, the anode of the second diode D2 is connected to the negative N terminal of the DC bus of the first regenerative power supply module to be aged, and the cathode of the second diode D2 is connected to the negative N terminal of the DC bus of the second regenerative power supply module to be aged.

[0017] Further, the first feedback power supply module to be aged and the second feedback power supply module to be aged include six power tubes and at least one capacitor, wherein the source of the first power tube and the drain of the second power tube are both connected to the U-phase AC end, the drain of the first power tube is connected to the positive electrode P end of the DC bus, the source of the second power tube is connected to the negative electrode N end of the DC bus, the source of the third power tube and the drain of the fourth power tube are both connected to the V-phase AC end, the drain of the third power tube is connected to the positive electrode P end of the DC bus, the source of the fourth power tube is connected to the negative electrode N end of the DC bus, the source of the fifth power tube and the drain of the sixth power tube are both connected to the W-phase AC end, the drain of the fifth power tube is connected to the positive electrode P end of the DC bus, the source of the sixth power tube is connected to the negative electrode N end of the DC bus, one end of the capacitor is connected to the positive electrode P end of the DC bus, the other end of the capacitor is connected to the negative electrode N end of the DC bus, and the gate of each power tube is connected to the control unit.

[0018] The utility model has at least the following beneficial effects:

[0019] The utility model proposes an aging test system for a feedback power supply module. By utilizing the characteristics of the feedback power supply module, power output of one feedback power supply module to be aged and energy feedback and load simulation of another feedback power supply module to be aged are realized, forming an energy circulation system, and aging of two feedback power supply modules is realized at the same time, and the electric energy converted in the aging process is fed back to the three-phase AC power grid, so as to achieve the purpose of aging with high efficiency, low energy consumption and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a first state of an aging system for a regenerative power supply module provided by an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of a second state of the aging system of the feedback power module provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "multiple" and "several" mean two or more.

[0026] See also Figure 1 and Figure 2 The embodiment of the utility model provides an aging system for a feedback power module, including a first feedback power module to be aged and a second feedback power module to be aged. The three-phase AC terminals U, V, and W of the first feedback power module to be aged are respectively connected to the three-phase 380V AC terminals L1, L2, and L3 of the power supply device via the first AC side inductor, and the three-phase AC terminals U, V, and W of the second feedback power module to be aged are respectively connected to the three-phase 380V AC terminals L1, L2, and L3 of the power supply device via the second AC side inductor. The DC bus positive electrode P terminal of the first feedback power module to be aged is connected to the DC bus positive electrode P terminal of the second feedback power module to be aged via the first diode D1, and the DC bus negative electrode N terminal of the first feedback power module to be aged is connected to the DC bus negative electrode N terminal of the second feedback power module to be aged via the second diode D2. The first diode D1 and the second diode D2 are used to prevent current circulation.

[0027] The aging system of the utility model utilizes the inherent characteristics of the feedback power supply module to realize the power output of one feedback power supply module to be aged, the energy feedback and load simulation of the other feedback power supply module to be aged, and constitutes an energy circulation system, so as to realize the simultaneous aging of the two feedback power supply modules and feed back the electric energy converted in the aging process to the three-phase AC power grid, so as to achieve the purpose of high efficiency, low energy consumption and low cost aging.

[0028] The selection of the first diode D1 and the second diode D2 is determined according to actual needs. For example, when the feedback power module to be aged is a high-power feedback power module, preferably, the first diode D1 and the second diode D2 are high-power diodes.

[0029] In some embodiments, the power supply device includes a power distribution cabinet, and the three-phase AC terminals L1, L2, and L3 of the power distribution cabinet are the three-phase AC terminals L1, L2, and L3 of the power supply device. The three-phase AC terminals U, V, and W of the first regenerative power module to be aged are connected to the three-phase AC terminals L1, L2, and L3 of the power distribution cabinet at least through the first AC side inductor, and the three-phase AC terminals U, V, and W of the second regenerative power module to be aged are connected to the three-phase AC terminals L1, L2, and L3 of the power distribution cabinet at least through the second AC side inductor. The power distribution cabinet is connected to the three-phase AC power grid.

[0030] In some embodiments, a first control switch is connected between the three-phase AC terminals U, V, W of the first regenerative power module to be aged and the three-phase 380V AC terminals L1, L2, L3 of the power distribution cabinet.

[0031] In some embodiments, the first control switch may be an air switch or an AC contactor.

[0032] In some embodiments, the second ends T2, T4, and T6 of the first control switch are respectively connected to the first ends R, S, and T of the first AC side inductor, the second ends X, Y, and Z of the first AC side inductor are respectively connected to the three-phase AC ends U, V, and W of the first aged feedback power supply module, and the first ends T1, T2, and T3 of the first control switch are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device.

[0033] In some embodiments, a first autocoupler is connected between the first AC side inductor and the three-phase 380V AC terminals L1, L2, and L3 of the distribution cabinet, or / and a second autocoupler is connected between the second AC side inductor and the three-phase AC terminals L1, L2, and L3 of the distribution cabinet.

[0034] In other embodiments, when a first autovoltage regulator is connected between the first AC side inductor and the three-phase 380V AC terminals L1, L2, and L3 of the distribution cabinet, the first ends A, B, and C of the first autovoltage regulator are respectively connected to the three-phase 380V AC terminals L1, L2, and L3 of the distribution cabinet, the second ends a, b, and c of the first autovoltage regulator are respectively connected to the first ends T1, T2, and T3 of the first control switch, the second ends T2, T4, and T6 of the first control switch are respectively connected to the first ends R, S, and T of the first AC side inductor, and the second ends X, Y, and Z of the first AC side inductor are respectively connected to the three-phase AC terminals U, V, and W of the first aged feedback power module.

[0035] In some embodiments, a second control switch is connected between the three-phase AC terminals U, V, W of the second aged regenerative power module and the three-phase 380V AC terminals L1, L2, L3 of the power distribution cabinet.

[0036] In some embodiments, the second control switch may be an air switch or an AC contactor.

[0037] In some embodiments, the first ends T1, T2, and T3 of the second control switch are respectively connected to the three-phase 380V AC terminals L1, L2, and L3 of the distribution cabinet, the second ends T2, T4, and T6 of the second control switch are respectively connected to the first ends R, S, and T of the second AC side inductor, and the second ends X, Y, and Z of the second AC side inductor are respectively connected to the three-phase AC terminals U, V, and W of the second aged feedback power supply module.

[0038] In other embodiments, when a second autovoltage regulator is connected between the second AC side inductor and the three-phase AC terminals L1, L2, and L3 of the distribution cabinet, the second ends T2, T4, and T6 of the second control switch are respectively connected to the first ends R, S, and T of the second AC side inductor, the second ends X, Y, and Z of the second AC side inductor are respectively connected to the three-phase AC terminals U, V, and W of the second aged feedback power supply module, the first ends T1, T2, and T3 of the second control switch are respectively connected to the second ends a, b, and c of the second autovoltage regulator, and the first ends A, B, and C of the second autovoltage regulator are respectively connected to the three-phase AC terminals L1, L2, and L3 of the power supply device.

[0039] Further, see Figure 1When the first regenerative power supply module to be aged works in a rectifying state and the second regenerative power supply module to be aged works in an inverting state, the anode of the first diode D1 is connected to the positive P terminal of the DC bus of the first regenerative power supply module to be aged, the cathode of the first diode D1 is connected to the positive P terminal of the DC bus of the second regenerative power supply module to be aged, the anode of the second diode D2 is connected to the negative N terminal of the DC bus of the second regenerative power supply module to be aged, and the cathode of the second diode D2 is connected to the negative N terminal of the DC bus of the first regenerative power supply module to be aged.

[0040] See also Figure 2 When the first regenerative power supply module to be aged works in the inverter state and the second regenerative power supply module to be aged works in the rectifying state, the anode of the first diode D1 is connected to the positive terminal P of the DC bus of the second regenerative power supply module to be aged, the cathode of the first diode D1 is connected to the positive terminal P of the DC bus of the first regenerative power supply module to be aged, the anode of the second diode D2 is connected to the negative terminal N of the DC bus of the first regenerative power supply module to be aged, and the cathode of the second diode D2 is connected to the negative terminal N of the DC bus of the second regenerative power supply module to be aged.

[0041] In some embodiments, the first feedback power module to be aged and the second feedback power module to be aged include six power tubes and at least one capacitor, wherein the source of the first power tube and the drain of the second power tube are both connected to the U-phase AC end, the drain of the first power tube is connected to the positive P-end of the DC bus, the source of the second power tube is connected to the negative N-end of the DC bus, the source of the third power tube and the drain of the fourth power tube are both connected to the V-phase AC end, the drain of the third power tube is connected to the positive P-end of the DC bus, the source of the fourth power tube is connected to the negative N-end of the DC bus, the source of the fifth power tube and the drain of the sixth power tube are both connected to the W-phase AC end, the drain of the fifth power tube is connected to the positive P-end of the DC bus, the source of the sixth power tube is connected to the negative N-end of the DC bus, one end of the capacitor is connected to the positive P-end of the DC bus, the other end of the capacitor is connected to the negative N-end of the DC bus, and the gate of each power tube is connected to the control unit.

[0042] The working principle of the utility model is as follows:

[0043] The utility model controls the voltage of the three-phase AC terminal of the first feedback power module to be aged by boosting or reducing the voltage through an autocoupler, thereby controlling the voltage U1 of the DC bus P and N terminals; or, by setting the internal instruction parameters of the first and second feedback power modules to be aged, thereby controlling the output voltages U1 and U2 of the DC bus P and N terminals.

[0044] When the voltage U1 of the DC bus P and N terminals of the first regenerative power module to be aged is greater than the voltage U2 of the DC bus P and N terminals of the second regenerative power module to be aged, the second regenerative power module to be aged is forced to form a buck step-down circuit with the second AC side inductor, and the energy is supplied to the three-phase 380V AC terminals L1, L2, and L3 of the distribution cabinet through the second control switch to achieve energy feedback; or, when the voltage U1 of the DC bus P and N terminals of the first regenerative power module to be aged is less than the voltage U2 of the DC bus P and N terminals of the second regenerative power module to be aged, the first regenerative power module to be aged is forced to form a buck step-down circuit with the first AC side inductor, the voltage is boosted by the autocoupler, and the energy is supplied to the three-phase 380V AC terminals L1, L2, and L3 of the distribution cabinet through the first control switch to achieve energy feedback, thereby forming an energy circulation system to reduce energy consumption.

[0045] Since the first regenerative power module to be aged and the second regenerative power module to be aged both have internal resistance, they can be used as loads. By adjusting the voltage difference U=|U1–U2|, the DC current is controlled to meet the test power, thereby achieving simultaneous aging of two regenerative power modules, improving the aging test efficiency, and reducing the investment in test equipment.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An aging system for a feedback power module, characterized in that: The invention comprises a first feedback power module to be aged and a second feedback power module to be aged, wherein the three-phase AC terminals U, V and W of the first feedback power module to be aged are respectively connected to the three-phase AC terminals L1, L2 and L3 of the power supply device via the first AC side inductor, the three-phase AC terminals U, V and W of the second feedback power module to be aged are respectively connected to the three-phase AC terminals L1, L2 and L3 of the power supply device via the second AC side inductor, the DC bus positive electrode P terminal of the first feedback power module to be aged is connected to the DC bus positive electrode P terminal of the second feedback power module to be aged via the first diode D1, and the DC bus negative electrode N terminal of the first feedback power module to be aged is connected to the DC bus negative electrode N terminal of the second feedback power module to be aged via the second diode D2.

2. The aging system for a regenerative power module according to claim 1, wherein: When the DC bus P and N terminal voltage U1 of the first regenerative power module to be aged is greater than the DC bus P and N terminal voltage U2 of the second regenerative power module to be aged, the second regenerative power module to be aged and the second AC side inductor form a buck step-down circuit; When the DC bus P and N terminal voltage U1 of the first aged regenerative power module is less than the DC bus P and N terminal voltage U2 of the second aged regenerative power module, the first aged regenerative power module and the first AC side inductor form a buck step-down circuit.

3. The aging system for a regenerative power module according to claim 1, wherein: A first autovoltage regulator is connected between the first AC side inductor and the three-phase AC terminals L1, L2, L3 of the power supply device, or / and a second autovoltage regulator is connected between the second AC side inductor and the three-phase AC terminals L1, L2, L3 of the power supply device.

4. The aging system for a regenerative power module according to any one of claims 1 to 3, characterized in that: A first control switch is connected between the three-phase AC terminals U, V, W of the first aged feedback power module and the three-phase AC terminals L1, L2, L3 of the power supply device.

5. The aging system for a regenerative power module according to claim 4, wherein: The second ends T2, T4, and T6 of the first control switch are respectively connected to the first ends R, S, and T of the first AC side inductor, the second ends X, Y, and Z of the first AC side inductor are respectively connected to the three-phase AC ends U, V, and W of the first aged feedback power supply module, the first ends T1, T2, and T3 of the first control switch are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device or the second ends a, b, and c of the first autocoupler. When the first ends T1, T2, and T3 of the first control switch are respectively connected to the second ends a, b, and c of the first autocoupler, the first ends A, B, and C of the first autocoupler are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device.

6. The aging system for a regenerative power module according to any one of claims 1 to 3, characterized in that: A second control switch is connected between the three-phase AC terminals U, V, W of the second aged feedback power module and the three-phase AC terminals L1, L2, L3 of the power supply device.

7. The aging system for a regenerative power module according to claim 6, wherein: The second ends T2, T4, and T6 of the second control switch are respectively connected to the first ends R, S, and T of the second AC side inductor, the second ends X, Y, and Z of the second AC side inductor are respectively connected to the three-phase AC ends U, V, and W of the second aged feedback power supply module, the first ends T1, T2, and T3 of the second control switch are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device or the second ends a, b, and c of the second autovoltage regulator, and when the first ends T1, T2, and T3 of the second control switch are respectively connected to the second ends a, b, and c of the second autovoltage regulator, the first ends A, B, and C of the second autovoltage regulator are respectively connected to the three-phase AC ends L1, L2, and L3 of the power supply device.

8. The aging system for a regenerative power module according to claim 1, wherein: The power supply device includes a distribution cabinet, and the three-phase AC terminals U, V, and W of the first regenerative power supply module to be aged are connected to the three-phase AC terminals L1, L2, and L3 of the distribution cabinet at least via the first AC side inductor, and are connected to the three-phase AC power grid through the distribution cabinet. The three-phase AC terminals U, V, and W of the second regenerative power supply module to be aged are connected to the three-phase AC terminals L1, L2, and L3 of the distribution cabinet at least via the second AC side inductor, and are connected to the three-phase AC power grid through the distribution cabinet.

9. The aging system for a regenerative power module according to claim 1, wherein: When the first regenerative power supply module to be aged works in a rectifying state and the second regenerative power supply module to be aged works in an inverting state, the anode of the first diode D1 is connected to the positive P terminal of the DC bus of the first regenerative power supply module to be aged, the cathode of the first diode D1 is connected to the positive P terminal of the DC bus of the second regenerative power supply module to be aged, the anode of the second diode D2 is connected to the negative N terminal of the DC bus of the second regenerative power supply module to be aged, and the cathode of the second diode D2 is connected to the negative N terminal of the DC bus of the first regenerative power supply module to be aged.

10. The aging system of the regenerative power module according to claim 1, wherein: When the first regenerative power supply module to be aged works in the inverter state and the second regenerative power supply module to be aged works in the rectifying state, the anode of the first diode D1 is connected to the positive P terminal of the DC bus of the second regenerative power supply module to be aged, the cathode of the first diode D1 is connected to the positive P terminal of the DC bus of the first regenerative power supply module to be aged, the anode of the second diode D2 is connected to the negative N terminal of the DC bus of the first regenerative power supply module to be aged, and the cathode of the second diode D2 is connected to the negative N terminal of the DC bus of the second regenerative power supply module to be aged.

Images