Voltage-sharing and current-sharing LLC circuit having wide output voltage range

Abstract

The present invention relates to a voltage-sharing and current-sharing LLC circuit having a wide output voltage range. The LLC circuit comprises a three-phase inverter bridge module, a three-phase resonant module, a primary-side switching module, a rectifier output module, a secondary-side switching output module, a first transformer unit, a second transformer unit, a third transformer unit, a fourth transformer unit, a fifth transformer unit and a sixth transformer unit, wherein the primary-side switching module is connected between the three-phase resonant module and the first to sixth transformer units; the secondary-side switching output module is separately connected to the first to sixth transformer units and the rectifier output module; and the primary-side switching module and the secondary-side switching output module are controlled to switch so as to control the voltage-sharing and current-sharing LLC circuit having a wide output voltage range to operate in multiple different operating modes, so as to output multiple different voltages. The voltage-sharing and current-sharing LLC circuit having a wide output voltage range of the present invention can operate in multiple modes and output different operating voltages in the corresponding modes, and can realize current sharing or voltage sharing.

Description

A wide output voltage equalization and current equalization LLC circuit Technical Field

[0001] This invention relates to the field of electric vehicles, and more specifically, to a wide output voltage equalization and current equalization LLC circuit suitable for electric vehicle charging modules. Background Technology

[0002] With the rapid development of electric vehicles, the power requirements of their charging modules are increasing. To solve this problem, multi-channel interleaved parallel circuits are usually used, with more parallel channels for higher power. Figure 1 shows a circuit diagram of a two-channel full-bridge LLC interleaved parallel circuit in the prior art. Figure 2 shows a circuit diagram of a three-channel full-bridge LLC interleaved parallel circuit in the prior art. However, these prior art technologies have the following drawbacks: due to the wide output voltage range, the output is a series-parallel switching circuit, and the transformer secondary side has a cross winding, the switching frequency of each LLC channel must be kept consistent to achieve the purpose of interleaved parallel connection and reduced ripple. Furthermore, due to some deviations in the actual parameters of the resonant devices, the actual current of each channel is inconsistent, that is, the current is not uniform between channels, and the output voltage cannot be uniform, so the entire circuit cannot work stably and reliably. Technical issues

[0003] The technical problem to be solved by the present invention is to provide a wide output voltage equalization and current equalization LLC circuit that can operate in multiple modes and output different operating voltages in corresponding modes, and can achieve wide voltage range high power output with equal current or equal voltage. Technical solutions

[0004] One technical solution adopted by this invention to solve its technical problem is to construct a wide output voltage equalization and current equalization LLC circuit, including a three-phase inverter bridge module, a three-phase resonant module, a primary-side switching module, a first transformer module, a second transformer module, a third transformer module, a rectifier output module, and a secondary-side switching output module; the primary sides of the first transformer module, the second transformer module, and the third transformer module are sequentially connected to the three-phase resonant module and the three-phase inverter bridge module, and the secondary sides are sequentially connected to the rectifier output module and the secondary-side switching output module; the first transformer module includes a first transformer unit and a second transformer unit, the second transformer module includes a third transformer unit and a fourth transformer unit, and the third transformer module includes a fifth transformer unit and a sixth transformer unit; the primary-side switching module is connected between the three-phase resonant module and the primary sides of the first transformer unit, the second transformer unit, the third transformer unit, the fourth transformer unit, the fifth transformer unit, and the sixth transformer unit; the rectifier output module includes a first rectifier output unit, a second rectifier output unit, and a third rectifier output unit. The system comprises a primary-side transformer unit, a fourth rectifier output unit, a fifth rectifier output unit, and a sixth rectifier output unit. The primary-side transformer unit is connected to the secondary side of the first transformer unit, the second rectifier output unit is connected to the secondary side of the second transformer unit, the third rectifier output unit is connected to the secondary side of the third transformer unit, the fourth rectifier output unit is connected to the secondary side of the fourth transformer unit, the fifth rectifier output unit is connected to the secondary side of the fifth transformer unit, and the sixth rectifier output unit is connected to the secondary side of the sixth transformer unit. A secondary-side switching output module is connected to the secondary sides of the first, second, third, fourth, fifth, and sixth transformer units, as well as the primary-side transformer unit, the second rectifier output unit, the third rectifier output unit, the fourth rectifier output unit, the fifth rectifier output unit, and the sixth rectifier output unit. The primary-side switching module and the secondary-side switching output module are controlled to switch the wide output voltage equalization and current equalization LLC circuit to operate in multiple different operating modes to output multiple different voltages. Beneficial effects

[0005] Therefore, the wide output voltage equalization and current equalization LLC circuit of the present invention can operate in multiple modes and output different operating voltages in the corresponding modes, and can achieve current equalization or voltage equalization. Attached Figure Description

[0006] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0007] Figure 1 is a circuit diagram of a two-way full-bridge LLC interleaved parallel circuit in the prior art;

[0008] Figure 2 is a circuit diagram of a three-way full-bridge LLC interleaved parallel circuit in the prior art;

[0009] Figure 3 is a schematic block diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention;

[0010] Figure 4 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention;

[0011] Figure 5 is a schematic diagram of the transformer windings of the wide output voltage equalization and current equalization LLC circuit shown in Figure 4;

[0012] Figure 6 is a circuit diagram of the wide output voltage equalization and current equalization LLC circuit shown in Figure 4 under one operating mode;

[0013] Figure 7 is a circuit diagram of another operating mode of the wide output voltage equalization and current equalization LLC circuit shown in Figure 4;

[0014] Figure 8 is a schematic diagram of the switching status of the switching devices under different operating modes of the wide output voltage equalization and current equalization LLC circuit shown in Figure 4;

[0015] Figure 9 is a partial equivalent circuit diagram of the wide output voltage equalization and current equalization LLC circuit shown in Figure 4 when the secondary winding output is connected in parallel.

[0016] Figure 10 is a circuit diagram of the transformer extension of the wide output voltage equalization and current equalization LLC circuit of the present invention;

[0017] Figure 11 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention;

[0018] Figure 12 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention;

[0019] Figure 13 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention. The best embodiment of the present invention

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Figure 3 shows a schematic block diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention. As shown in Figure 3, the wide output voltage equalization and current equalization LLC circuit of the present invention includes a three-phase inverter bridge module 100, a three-phase resonant module 700, a primary-side switching module 500, a first transformer module 200, a second transformer module 300, a third transformer module 400, a rectifier output module 500, and a secondary-side switching output module 600. As shown in Figure 3, the primary sides of the first transformer module 200, the second transformer module 300, and the third transformer module 400 are sequentially connected to the three-phase resonant module 700 and the three-phase inverter bridge module 100, and the secondary sides are sequentially connected to the rectifier output module 500 and the secondary-side switching output module 600. The first transformer module 200 includes a first transformer unit 210 and a second transformer unit 220, the second transformer module 300 includes a third transformer unit 310 and a fourth transformer unit 320, and the third transformer module 400 includes a fifth transformer unit 410 and a sixth transformer unit 420. The primary-side switching module 500 is connected to the three-phase resonant module 700, and between the primary sides of the first transformer unit 210, the second transformer unit 220, the third transformer unit 310, the fourth transformer unit 320, the fifth transformer unit 410, and the sixth transformer unit 420.

[0022] The rectifier output module 500 includes a first rectifier output unit 510, a second rectifier output unit 520, a third rectifier output unit 530, a fourth rectifier output unit 540, a fifth rectifier output unit 550, and a sixth rectifier output unit 560. The first rectifier output unit 510 is connected to the secondary side of the first transformer unit 210, the second rectifier output unit 520 is connected to the secondary side of the second transformer unit 220, the third rectifier output unit 530 is connected to the secondary side of the third transformer unit 310, the fourth rectifier output unit 540 is connected to the secondary side of the fourth transformer unit 320, the fifth rectifier output unit 550 is connected to the secondary side of the fifth transformer unit 410, and the sixth rectifier output unit 560 is connected to the secondary side of the sixth transformer unit 420. The secondary-side switching output module 600 is connected to the secondary sides of the first transformer unit 210, the second transformer unit 220, the third transformer unit 310, the fourth transformer unit 320, the fifth transformer unit 410, and the sixth transformer unit 420, as well as the first rectifier output unit 510, the second rectifier output unit 520, the third rectifier output unit 530, the fourth rectifier output unit 540, the fifth rectifier output unit 550, and the sixth rectifier output unit 560. The primary-side switching module 500 and the secondary-side switching output module 600 are controlled to switch to control the wide output voltage equalization and current equalization LLC circuit to operate in multiple different operating modes to output multiple different voltages.

[0023] In a preferred embodiment of the present invention, the three-phase inverter bridge module 100 can employ any suitable three-phase inverter bridge unit, such as a three-phase half-bridge inverter unit, a three-phase full-bridge inverter unit, etc., and these inverter units can employ any suitable structure, such as switching transistors or diodes. The three-phase resonant module 700 can employ any suitable LC resonant unit structure. For example, in a preferred embodiment of the present invention, the three-phase inverter bridge module 100 includes an input capacitor, a first inverter unit, a second inverter unit, and a third inverter unit; the three-phase resonant module 700 includes a first LC resonant unit, a second LC resonant unit, and a third LC resonant unit. The first end of the input capacitor is connected to the first power input terminal, the first input terminal of the first inverter unit, the first input terminal of the second inverter unit, and the first input terminal of the third inverter unit; the second end of the input capacitor is connected to the second power input terminal, the second input terminal of the first inverter unit, the second input terminal of the second inverter unit, and the second input terminal of the third inverter unit; the output terminal of the first inverter unit is connected to the first transformer module 200 via the first LC resonant unit, the output terminal of the second inverter unit is connected to the second transformer module 300 via the second LC resonant unit, and the output terminal of the third inverter unit is connected to the third transformer module 400 via the third LC resonant unit.

[0024] In a preferred embodiment of the present invention, each transformer unit may include N sets of windings, where N is a positive integer greater than 2, which can be expanded according to actual conditions to support high power output. As shown in FIG10, the first transformer module 200, the second transformer module 300, and the transformer module 40 each include N transformer units; the primary windings of the first to Nth transformer units are connected in parallel. That is, as shown in FIG10, the corresponding ends of the first primary windings of the first to Nth transformer units are connected to each other, the opposite ends of the first primary windings are connected to each other, the corresponding ends of the second primary windings are connected to each other, and the opposite ends of the second primary windings are connected to each other, where N is a positive integer greater than or equal to 2.

[0025] In subsequent embodiments of the present invention, each transformer unit is described as comprising two sets of windings, namely a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding. For example, the first transformer unit 210 includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding; the second transformer unit 220 includes a third primary winding, a fourth primary winding, a third secondary winding, and a fourth secondary winding; the third transformer unit 310 includes a fifth primary winding, a sixth primary winding, a fifth secondary winding, and a sixth secondary winding; the fourth transformer unit 320 includes a seventh primary winding, an eighth primary winding, a seventh secondary winding, and an eighth secondary winding; the fifth transformer unit 410 includes a ninth primary winding, a tenth primary winding, a ninth secondary winding, and a tenth secondary winding; and the sixth transformer unit 420 includes an eleventh primary winding, a twelfth primary winding, an eleventh secondary winding, and a twelfth secondary winding.

[0026] In a preferred embodiment of the present invention, each rectifier output unit may employ a diode rectifier output unit or a switching transistor rectifier output unit, both of which fall within the protection scope of the present invention. In a preferred embodiment of the present invention, the primary-side switching module 500 and the secondary-side switching output module 600 may include multiple switching devices that work collaboratively to control the primary windings of each transformer unit to select different numbers of turns in series and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a first operating voltage in a first operating mode, a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the first operating voltage to the fifth operating voltage. When the multiple transformer units operate in series, the secondary windings of the transformers share the current. When the multiple transformers operate in parallel, since they are connected to the rectifier output unit, current sharing can be achieved by adjusting the device values ​​of the rectifier output unit.

[0027] It should be noted that the construction and connection relationship of the secondary-side switching output module 600 and the rectifier output unit can be constructed using any suitable switching device and connection relationship known in the art. These all fall within the protection scope of this invention. Therefore, the wide output voltage equalization and current equalization LLC circuit of this invention can operate in multiple modes, output different operating voltages in corresponding modes, and achieve current equalization or voltage equalization.

[0028] Figure 4 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention. As shown in Figure 4, the wide output voltage equalization and current equalization LLC circuit of the present invention includes a three-phase inverter bridge module 100, a three-phase resonant module 700, a primary-side switching module 500, a first transformer module 200, a second transformer module 300, a third transformer module 400, a rectifier output module 500, and a secondary-side switching output module 600.

[0029] The three-phase inverter bridge module 100 includes an input capacitor C1 and switching transistors Q1-Q6. The three-phase resonant module 700 includes three sets of resonant inductors L1 and resonant capacitors C2 connected in series. The first end of the input capacitor C1 is connected to the drain of switching transistors Q1-Q3 and the first power input terminal, and the second end is connected to the source of switching transistors Q4-Q6 and the second power input terminal. Switches Q1 and Q4 are connected in series, switching transistors Q2 and Q5 are connected in series, and switching transistors Q3 and Q6 are connected in series. Their connection points are respectively connected to a set of resonant inductors L1 and resonant capacitors C2, which are connected to the corresponding transformer modules.

[0030] The first transformer module 200 includes transformers T1 and T2; the second transformer module 300 includes transformers T3 and T4; and the third transformer module 400 includes transformers T5 and T6. Each transformer includes two sets of windings. As shown in Figure 5, each transformer includes primary windings P1 and P2, and secondary windings N1 and N2. Specifically, transformer T1 includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding; transformer T2 includes a third primary winding, a fourth primary winding, a third secondary winding, and a fourth secondary winding; transformer T3 includes a fifth primary winding, a sixth primary winding, a fifth secondary winding, and a sixth secondary winding; transformer T4 includes a seventh primary winding, an eighth primary winding, a seventh secondary winding, and an eighth secondary winding; transformer T5 includes a ninth primary winding, a tenth primary winding, a ninth secondary winding, and a tenth secondary winding; and transformer T6 includes an eleventh primary winding, a twelfth primary winding, an eleventh secondary winding, and a twelfth secondary winding. In a further preferred embodiment of the invention, the number of transformers can be expanded as shown in Figure 10, i.e., the number of transformers connected in parallel N ≥ 2, to support the realization of high-power voltage and current sharing output. As shown in Figure 10, the first transformer module 200, the second transformer module 300, and the transformer module 40 each include N transformer units; the primary windings of the first to Nth transformer units are connected in parallel. Specifically, as shown in Figure 10, the corresponding ends of the first primary windings of the first to Nth transformer units are connected to each other, and the opposite ends of the first primary windings are connected to each other; the corresponding ends of the second primary windings are connected to each other, and the opposite ends of the second primary windings are connected to each other, where N is a positive integer greater than or equal to 2.

[0031] The primary-side switching module 500 includes a first single-pole double-throw switch K1, a second single-pole double-throw switch K2, and a single-pole single-throw switch K3. The secondary-side switching output module 600 includes a first secondary-side switch K4, a second secondary-side switch K5, a third secondary-side switch K6, and output capacitors C3 and C4. The rectifier output module 500 includes a first rectifier output unit 510, a second rectifier output unit 520, a third rectifier output unit 530, a fourth rectifier output unit 540, a fifth rectifier output unit 550, and a sixth rectifier output unit 560. Each rectifier output unit includes two diodes. The cathodes of the two diodes are connected to each other to form the output terminal of the rectifier output unit, and the anodes serve as the two input terminals of the rectifier output unit, connected to the corresponding secondary windings.

[0032] As shown in Figure 3, the first end of the first primary winding and the first end of the third primary winding are connected to the first end of the three-phase resonant module 700 (i.e., the first end of the first set of resonant inductors L1 and C2, the second end of which is connected to the connection point of switching transistors Q1 and Q4). The second end of the first primary winding and the second end of the third primary winding are connected to the moving contact of the first single-pole double-throw switch K1. The first end of the second primary winding and the first end of the fourth primary winding are connected to the first stationary contact of the first single-pole double-throw switch K1. The second ends of the second primary winding, the fourth primary winding, the sixth primary winding, the eighth primary winding, the tenth primary winding, and the twelfth primary winding are connected to each other. The first end of the fifth primary winding and the first end of the seventh primary winding are connected to the second end of the three-phase resonant module 700 (i.e., the first end of the second set of resonant inductors L1 and C2, the second end of which is connected to the connection point of switching transistors Q2 and Q5). The second end of the fifth primary winding and the second end of the seventh primary winding are connected to the moving contact of the second single-pole double-throw switch K2. The first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first stationary contact of the second single-pole double-throw switch K2. The first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the... The third terminal of the three-phase resonant module 700 (i.e., the first terminal of the third set of resonant inductors L1 and C2, the second terminal of which is connected to the connection point of switching transistors Q3 and Q6), the second terminal of the ninth primary winding, the second terminal of the eleventh primary winding, the first terminal of the tenth primary winding, and the first terminal of the twelfth primary winding are all connected to the first terminal of the single-pole single-throw switch K3; the second stationary contact of the first single-pole double-throw switch K1 and the second stationary contact of the second single-pole double-throw switch K2 are all connected to the first terminal of the single-pole single-throw switch K3; the second terminal of the single-pole single-throw switch K3 is connected to the second power input terminal.

[0033] The first end of the first secondary winding and the second end of the second secondary winding are connected to the two input terminals of the first rectifier output unit 510; the first end of the third secondary winding and the second end of the fourth secondary winding are connected to the two input terminals of the second rectifier output unit 520; the first end of the fifth secondary winding and the second end of the sixth secondary winding are connected to the two input terminals of the third rectifier output unit 530; the first end of the seventh secondary winding and the second end of the eighth secondary winding are connected to the two input terminals of the fourth rectifier output unit 540; the first end of the ninth secondary winding and the second end of the tenth secondary winding are connected to the two input terminals of the first rectifier output unit 510. The first end of the eleventh secondary winding and the second end of the twelfth secondary winding are connected to the two input terminals of the sixth rectifier output unit 560; the second end of the first secondary winding and the first end of the second secondary winding are connected to each other, the second end of the third secondary winding and the first end of the fourth secondary winding are connected to each other, the second end of the fifth secondary winding and the first end of the sixth secondary winding are connected to each other, the second end of the seventh secondary winding and the first end of the eighth secondary winding are connected to each other, the second end of the ninth secondary winding and the first end of the tenth secondary winding are connected to each other, and the second end of the eleventh secondary winding and the first end of the twelfth secondary winding are connected to each other. The connection points of the first and second secondary windings, the third and fourth secondary windings, and the fifth and sixth secondary windings are connected to each other to form a first winding connection point A; the connection points of the seventh and eighth secondary windings, the ninth and tenth secondary windings, and the eleventh and twelfth secondary windings are connected to each other to form a second winding connection point B. The output terminals of the first rectifier output unit 510, the third rectifier output unit 530, and the fifth rectifier output unit 550 are connected to each other to form a first rectifier output terminal C; the output terminals of the second rectifier output unit 520, the fourth rectifier output unit 540, and the sixth rectifier output unit 560 are connected to each other to form a second rectifier output terminal D.

[0034] The first secondary switch K4 is connected between the first winding connection point A and the second rectifier output terminal D; the second secondary switch K5 is connected between the first rectifier output terminal C and the second rectifier output terminal D; and the third secondary switch K6 is connected between the first winding connection point A and the second winding connection point B. The output capacitor C3 is connected between the first rectifier output terminal C and the first winding connection point A; and the output capacitor C4 is connected between the second rectifier output terminal D and the second winding connection point B. In a preferred embodiment of the invention, the first single-pole double-throw switch K1, the second single-pole double-throw switch K2, and the single-pole single-throw switch K3, as well as the first secondary switch K4, the second secondary switch K5, and the third secondary switch K6, are all relay switches. Of course, switching transistors or other switching devices can also be used to implement the invention.

[0035] Figure 6 is a circuit diagram of the wide output voltage equalization and current sharing LLC circuit shown in Figure 4 under one operating mode. Figure 7 is a circuit diagram of the wide output voltage equalization and current sharing LLC circuit shown in Figure 4 under another operating mode. Figure 8 is a schematic diagram of the switching status of the switching devices under different operating modes of the wide output voltage equalization and current sharing LLC circuit shown in Figure 4. Figure 9 is a partial equivalent circuit diagram of the wide output voltage equalization and current sharing LLC circuit shown in Figure 4 when the secondary winding output is connected in parallel. The working principle of the wide output voltage equalization and current sharing LLC circuit shown in Figure 4 will be explained below with reference to Figures 6-8. As shown in Figures 6-9, the primary side of this wide output voltage equalization and current sharing LLC circuit is a three-phase full-bridge LLC circuit. In order to better operate under wide output voltage, each transformer includes two primary windings, and the specific structure of the windings is shown in Figure 5. By adding the first single-pole double-throw switch K1, the second single-pole double-throw switch K2, and the single-pole single-throw switch K3, the switching of the moving contacts of the first single-pole double-throw switch K1 and the second single-pole double-throw switch K2 between the first and second stationary contacts can achieve both high-turns primary windings (i.e., as shown in Figure 4, the primary windings P1 and P2 of the same transformer are connected in series and then in parallel) and low-turns primary windings (i.e., as shown in Figures 6-7, the primary windings P1 of different transformers are connected in parallel, transformers T1-T2 are connected in parallel, transformers T3-T4 are connected in parallel, transformers T5-T6 are connected in parallel, and the primary windings P1 and P2 of transformers T1-T2, T3-T4, and T5-T6 are connected in parallel respectively). The switching of the single-pole single-throw switch K3 can decouple the wide-output-voltage equalization and current-equalization LLC circuit into different LLC circuits. As shown in Figures 4 and 6, when the single-pole single-throw switch K3 is open, the wide output voltage equalization and current equalization LLC circuit is a three-phase "Y"-connected LLC circuit. However, as shown in Figure 7, when the single-pole single-throw switch K3 is closed, the wide output voltage equalization and current equalization LLC circuit is decoupled into three independent half-bridge LLC circuits.

[0036] As shown in Figure 8, when the moving contact of the first single-pole double-throw switch K1 is connected to the second stationary contact, the moving contact of the second single-pole double-throw switch K1 is connected to the second stationary contact, and the single-pole single-throw switch K3 is energized, the first secondary-side switch K4 is open, and the second secondary-side switch K5 and the third secondary-side switch K6 are closed. That is, the first single-pole double-throw switch K1 and the second single-pole double-throw switch K1 are switched into low-turn windings, the primary windings P1 of different transformers are connected in parallel, the primary side of the wide output voltage equalization and current equalization LLC circuit is decoupled into three independent half-bridge LLC circuits, and the secondary output of the wide output voltage equalization and current equalization LLC circuit operates in parallel mode. Therefore, the wide output voltage equalization and current equalization LLC circuit operates in the first operating mode and outputs the first operating voltage.

[0037] When the moving contact of the first single-pole double-throw switch K1 is connected to the second stationary contact, the moving contact of the second single-pole double-throw switch K1 is connected to the second stationary contact, and the single-pole single-throw switch K3 is open, the first secondary switch K4 is open, and the second secondary switch K5 and the third secondary switch K6 are closed, that is, the first single-pole double-throw switch K1 and the second single-pole double-throw switch K1 are switched into low-turn windings, the primary windings P1 of different transformers are connected in parallel, the primary side of the wide output voltage equalization and current equalization LLC circuit is a three-phase "Y" type LLC circuit, and the secondary output of the wide output voltage equalization and current equalization LLC circuit works in parallel mode. Therefore, the wide output voltage equalization and current equalization LLC circuit works in the second working mode and outputs the second working voltage. When the moving contact of the first single-pole double-throw switch K1 is connected to the first stationary contact, the moving contact of the second single-pole double-throw switch K1 is connected to the first stationary contact, and the single-pole single-throw switch K3 is open, the first secondary switch K4 is open, and the second secondary switch K5 and the third secondary switch K6 are closed, that is, the first single-pole double-throw switch K1 and the second single-pole double-throw switch K1 are switched into high-turns windings, the primary windings P1 and P2 of the same transformer are connected in series and then in parallel, the primary side of the wide output voltage equalization and current sharing LLC circuit is a three-phase "Y" type LLC circuit, and the secondary output of the wide output voltage equalization and current sharing LLC circuit works in parallel mode. Therefore, the wide output voltage equalization and current sharing LLC circuit works in the third working mode and outputs the third working voltage. When the moving contact of the first single-pole double-throw switch K1 is connected to the second stationary contact, the moving contact of the second single-pole double-throw switch K1 is connected to the second stationary contact, and the single-pole single-throw switch K3 is open, the first secondary switch K4 is energized, and the second secondary switch K5 and the third secondary switch K6 are open. That is, the first single-pole double-throw switch K1 and the second single-pole double-throw switch K1 are switched into low-turn windings, the primary windings P1 of different transformers are connected in parallel, the primary side of the wide output voltage equalization and current equalization LLC circuit is a three-phase "Y" type LLC circuit, and the secondary output of the wide output voltage equalization and current equalization LLC circuit works in series mode. Therefore, the wide output voltage equalization and current equalization LLC circuit works in the fourth working mode and outputs the fourth working voltage.When the moving contact of the first single-pole double-throw switch K1 is connected to the first stationary contact, the moving contact of the second single-pole double-throw switch K1 is connected to the first stationary contact, and the single-pole single-throw switch K3 is open, the first secondary switch K4 is energized, and the second secondary switch K5 and the third secondary switch K6 are open. That is, the first single-pole double-throw switch K1 and the second single-pole double-throw switch K1 are switched into high-turns windings. The primary windings P1 and P2 of the same transformer are connected in series and then in parallel. The primary side of the wide output voltage equalization and current equalization LLC circuit is a three-phase "Y" type LLC circuit, and the secondary output of the wide output voltage equalization and current equalization LLC circuit works in series mode. Therefore, the wide output voltage equalization and current equalization LLC circuit works in the fifth working mode and outputs the fifth working voltage.

[0038] Therefore, it can be seen that, through the state combinations of the first single-pole double-throw switch K1, the second single-pole double-throw switch K1, the single-pole single-throw switch K3, the first secondary-side switch K4, the second secondary-side switch K5, and the third secondary-side switch K6 shown in Figure 8, the wide output voltage equalization LLC circuit can operate in five working modes, outputting five working voltages from low to high, thus achieving a wide range of voltage output. Furthermore, when the primary side of the wide output voltage equalization LLC circuit is a three-phase "Y"-connected LLC circuit, the switching transistors of the wide output voltage equalization LLC circuit will hard-switch when the duty cycle is adjusted, activating the single-pole single-throw switch K3, thus decoupling the three-phase LLC. Therefore, a single-channel LLC circuit can operate in duty cycle adjustment mode, achieving an even lower voltage output.

[0039] When the first secondary-side switch K4 is closed and the second secondary-side switch K5 and the third secondary-side switch K6 are open, the secondary-side output of the wide output voltage equalization and current equalization LLC circuit operates in series mode, thus automatically achieving current equalization. When the first secondary-side switch K4 is open and the second secondary-side switch K5 and the third secondary-side switch K6 are closed, the secondary-side output of the wide output voltage equalization and current equalization LLC circuit operates in parallel mode, thus automatically achieving voltage equalization. However, at this time, the secondary winding of the transformer in the wide output voltage equalization and current equalization LLC circuit is also in parallel mode. Due to the uniformity of the voltage drop across the secondary-side diodes, this may lead to current imbalance between the transformer and the diodes. The equivalent circuit of the transformer and its corresponding rectifier unit diodes for each transformer unit is shown in Figure 9. Lr1, Lr2, Lr3, and Lr4 are the leakage inductances of the secondary windings N1 and N2 of transformers T1 and T2, respectively, with leakage inductance values ​​L for Lr1 and Lr3. Diode D1 has a current of I1 and a voltage drop of Vf1, while diode D2 has a current of I2 and a voltage drop of Vf2. The operating frequency is f. The derivation is I1 - I2 = (Vf2 - Vf1) / (2π * f * L). From this equation, it can be seen that the current difference in this branch is inversely proportional to the frequency and inductance. When the frequency f and inductance L are taken at appropriate values, the current difference between the diode branches containing diode D1 and D3 can be controlled to a smaller value, achieving a better current sharing effect. Therefore, the wide output voltage equalization and current sharing LLC circuit of this invention can operate in multiple modes and output different operating voltages in corresponding modes, achieving either current sharing or voltage equalization. In this preferred embodiment, by introducing multiple switching devices, the wide output voltage equalization and current equalization LLC circuit of the present invention can operate in multiple modes, realizing a wide voltage range and high power output of the LLC circuit, supporting N≥2 transformers in parallel, and realizing unlimited power expansion.

[0040] Figure 11 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention. In the preferred embodiment shown in Figure 11, its principle and connection relationship are basically similar to those of the embodiment shown in Figure 4, the main difference being the design of the primary-side switching module 500. The primary-side switching module 500 and its connection relationship with related modules are described below. As shown in Figure 11, the primary-side switching module 500 includes a first single-pole double-throw switch K1, a second single-pole double-throw switch K2, a third single-pole double-throw switch K7, and a single-pole single-throw switch K3. The first end of the first primary winding and the first end of the third primary winding are connected to the first stationary contact of the first single-pole double-throw switch K1, and the moving contact of the first single-pole double-throw switch K1 is connected to the first end of the three-phase resonant module 700; the second end of the first primary winding, the second end of the third primary winding, the first end of the second primary winding, and the first end of the fourth primary winding are connected to the second stationary contact of the first single-pole double-throw switch K1; the second end of the second primary winding, the second end of the fourth primary winding, the second end of the sixth primary winding, the second end of the eighth primary winding, the second end of the tenth primary winding, and the second end of the twelfth primary winding are all connected to the first end of the single-pole single-throw switch K3; the second end of the single-pole single-throw switch K3 is connected to the second power input terminal; the first end of the fifth primary winding and the seventh The first end of the primary winding is connected to the first stationary contact of the second single-pole double-throw switch K2, and the moving contact of the second single-pole double-throw switch K2 is connected to the second end of the three-phase resonant module 700; the second end of the fifth primary winding, the second end of the seventh primary winding, the first end of the sixth primary winding, and the first end of the eighth primary winding are connected to the second stationary contact of the second single-pole double-throw switch K2; the first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the first stationary contact of the third single-pole double-throw switch K7, and the moving contact of the third single-pole double-throw switch K7 is connected to the third end of the three-phase resonant module 700; the second end of the ninth primary winding, the second end of the eleventh primary winding, the first end of the tenth primary winding, and the first end of the twelfth primary winding are connected to the second stationary contact of the third single-pole double-throw switch K7. In the preferred embodiment shown in Figure 11, the moving contacts of the first single-pole double-throw switch K1, the second single-pole double-throw switch K2, and the third single-pole double-throw switch K7 are used to select between the first and second stationary contacts to select between high-turns and low-turns windings. The output voltage equalization and current equalization LLC circuit is decoupled into a three-phase "Y"-connected LLC circuit or three independent half-bridge LLC circuits by opening and closing the single-pole single-throw switch K3. Therefore, its switching method and operating mode are the same as those shown in Figure 8, except that K1 and K2 are switched to either the high-turns or low-turns winding, and K1, K2, and K7 are switched to either the high-turns or low-turns winding. This will not be elaborated further here.

[0041] Figure 12 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention. In the preferred embodiment shown in Figure 12, its principle and connection relationship are basically similar to those of the embodiment shown in Figure 4, the main difference being the design of the primary-side switching module 500. The primary-side switching module 500 and its connection relationship with related modules are described below. In fact, compared with the embodiment shown in Figure 4, the embodiment shown in Figure 12 removes the single-pole single-throw switch K3, so it is equivalent to the single-pole single-throw switch K3 always being in the open state. As shown in Figure 12, the primary-side switching module 500 includes a first single-pole double-throw switch K1 and a second single-pole double-throw switch K2. The first end of the first primary winding and the first end of the third primary winding are connected to the first end of the three-phase resonant module 700. The second end of the first primary winding and the second end of the third primary winding are connected to the moving contact of the first single-pole double-throw switch K1. The first end of the second primary winding and the first end of the fourth primary winding are connected to the first stationary contact of the first single-pole double-throw switch K1. The second ends of the second primary winding, the fourth primary winding, the sixth primary winding, the eighth primary winding, the tenth primary winding, and the twelfth primary winding are connected to each other. The first end of the fifth primary winding and the first end of the seventh primary winding are connected to... The second end of the three-phase resonant module 700, the second end of the fifth primary winding and the second end of the seventh primary winding are connected to the moving contact of the second single-pole double-throw switch K2, the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first stationary contact of the second single-pole double-throw switch K2; the first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the third end of the three-phase resonant module 700, and the second end of the ninth primary winding, the second end of the eleventh primary winding, the first end of the tenth primary winding and the first end of the twelfth primary winding are all connected to the second stationary contact of the first single-pole double-throw switch K1 and the second stationary contact of the second single-pole double-throw switch K2. In the preferred embodiment shown in Figure 12, the moving contacts of the first single-pole double-throw switch K1 and the second single-pole double-throw switch K2 are used to switch between the first stationary contact and the second stationary contact to select the high-turns winding or the low-turns winding. The single-pole single-throw switch K3 is removed, so it is equivalent to the single-pole single-throw switch K3 always being in the open state. Therefore, it only includes four working modes, namely the second working mode to the fourth working mode shown in Figure 8, which will not be described in detail here.

[0042] Figure 13 is a circuit diagram of a preferred embodiment of the wide output voltage equalization and current equalization LLC circuit of the present invention. In the preferred embodiment shown in Figure 13, its principle and connection relationship are basically similar to those of the embodiment shown in Figure 4, the main difference being the design of the primary-side switching module 500. The primary-side switching module 500 and its connection relationship with related modules are described below. In fact, compared with the embodiment shown in Figure 11, the embodiment shown in Figure 13 removes the single-pole single-throw switch K3, so it is equivalent to the single-pole single-throw switch K3 always being in the open state. As shown in Figure 13, the primary-side switching module 500 includes a first single-pole double-throw switch K1, a second single-pole double-throw switch K2, and a third single-pole double-throw switch K7; the first end of the first primary-side winding and the first end of the third primary-side winding are connected to the first stationary contact of the first single-pole double-throw switch K1, and the moving contact of the first single-pole double-throw switch K1 is connected to the first end of the three-phase resonant module 700; the second end of the first primary-side winding, the second end of the third primary-side winding, the first end of the second primary-side winding, and the first end of the fourth primary-side winding are connected to the second stationary contact of the first single-pole double-throw switch K1; the second ends of the second primary-side winding, the second ends of the fourth primary-side winding, the second ends of the sixth primary-side winding, the second ends of the eighth primary-side winding, the second ends of the tenth primary-side winding, and the second ends of the twelfth primary-side winding are connected to each other; the fifth primary-side winding... One end of the first primary winding is connected to the first stationary contact of the second single-pole double-throw switch K2, and the moving contact of the second single-pole double-throw switch K2 is connected to the second end of the three-phase resonant module 700; the second end of the fifth primary winding, the second end of the seventh primary winding, the first end of the sixth primary winding, and the first end of the eighth primary winding are connected to the second stationary contact of the second single-pole double-throw switch K2; the first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the first stationary contact of the third single-pole double-throw switch K7, and the moving contact of the third single-pole double-throw switch K7 is connected to the third end of the three-phase resonant module 700; the second end of the ninth primary winding, the second end of the eleventh primary winding, the first end of the tenth primary winding, and the first end of the twelfth primary winding are connected to the second stationary contact of the third single-pole double-throw switch K7. In the preferred embodiment shown in Figure 13, the moving contacts of the first single-pole double-throw switch K1, the second single-pole double-throw switch K2, and the third single-pole double-throw switch K7 are used to select between the high-turns winding and the low-turns winding by switching between the first stationary contact and the second stationary contact. Since the single-pole single-throw switch K3 is removed, it is equivalent to the single-pole single-throw switch K3 always being in the open state. Therefore, it only includes four operating modes, namely the second to fourth operating modes shown in Figure 8, which will not be described further here.

[0043] Therefore, the wide output voltage equalization and current equalization LLC circuit of the present invention can operate in multiple modes, outputting different operating voltages in corresponding modes and achieving either current equalization or voltage equalization. In this preferred embodiment, by introducing multiple switching devices, the wide output voltage equalization and current equalization LLC circuit of the present invention can operate in multiple modes, achieving a wide voltage range and high power output for voltage equalization and current equalization, supporting N≥2 transformers in parallel, and realizing unlimited power expansion. By using the parallel connection of transformer windings to share switching devices, the number of switching devices can be reduced, resulting in a simple circuit, fewer components, excellent performance, and high practical value.

[0044] Although this invention has been described through specific embodiments, those skilled in the art should understand that various modifications and equivalent substitutions can be made to this invention without departing from its scope. Furthermore, various modifications can be made to this invention for specific situations or materials without departing from its scope. Therefore, this invention is not limited to the specific embodiments disclosed, but should include all embodiments falling within the scope of the claims. The above descriptions are merely preferred embodiments of the invention and are not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A wide output voltage equalization and current equalization LLC circuit, characterized in that, It includes a three-phase inverter bridge module, a three-phase resonant module, a primary-side switching module, a first transformer module, a second transformer module, a third transformer module, a rectifier output module, and a secondary-side switching output module; The primary windings of the first, second, and third transformer modules are sequentially connected to the three-phase resonant module and the three-phase inverter bridge module, and their secondary windings are sequentially connected to the rectifier output module and the secondary winding switching output module. The first transformer module includes a first transformer unit and a second transformer unit; the second transformer module includes a third transformer unit and a fourth transformer unit; and the third transformer module includes a fifth transformer unit and a sixth transformer unit. The primary winding switching module is connected between the three-phase resonant module and the primary windings of the first, second, third, fourth, fifth, and sixth transformer units. The rectifier output module includes a first rectifier output unit, a second rectifier output unit, a third rectifier output unit, a fourth rectifier output unit, a fifth rectifier output unit, and a sixth rectifier output unit. The first rectifier output unit is connected to the first transformer unit. The secondary side of the transformer circuit includes a second rectifier output unit connected to the secondary side of the second transformer unit, a third rectifier output unit connected to the secondary side of the third transformer unit, a fourth rectifier output unit connected to the secondary side of the fourth transformer unit, a fifth rectifier output unit connected to the secondary side of the fifth transformer unit, and a sixth rectifier output unit connected to the secondary side of the sixth transformer unit. The secondary-side switching output module is connected to the secondary sides of the first, second, third, fourth, fifth, and sixth transformer units, as well as the first, second, third, fourth, fifth, and sixth rectifier output units. The primary-side switching module and the secondary-side switching output module are controlled to switch between multiple operating modes to output multiple different voltages for the wide output voltage equalization and current equalization LLC circuit. The first transformer unit includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding; the second transformer unit includes a third primary winding, a fourth primary winding, a third secondary winding, and a fourth secondary winding; the third transformer unit includes a fifth primary winding, a sixth primary winding, a fifth secondary winding, and a sixth secondary winding; the fourth transformer unit includes a seventh primary winding, an eighth primary winding, a seventh secondary winding, and an eighth secondary winding; the fifth transformer unit includes a ninth primary winding, a tenth primary winding, a ninth secondary winding, and a tenth secondary winding; the sixth transformer unit includes an eleventh primary winding, a twelfth primary winding, an eleventh secondary winding, and a twelfth secondary winding. The primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a first operating voltage in a first operating mode, a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the first operating voltage to the fifth operating voltage; or the primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the second operating voltage to the fifth operating voltage. The primary-side switching module includes a first single-pole double-throw switch, a second single-pole double-throw switch, and a single-pole single-throw switch; the first end of the first primary-side winding and the first end of the third primary-side winding are connected to the first end of the three-phase resonant module; the second end of the first primary-side winding and the second end of the third primary-side winding are connected to the moving contact of the first single-pole double-throw switch; the first end of the second primary-side winding and the first end of the fourth primary-side winding are connected to the first stationary contact of the first single-pole double-throw switch; the second ends of the second primary-side winding, the second ends of the fourth primary-side winding, the second ends of the sixth primary-side winding, the second ends of the eighth primary-side winding, the second ends of the tenth primary-side winding, and the second ends of the twelfth primary-side winding are connected to each other; the first ends of the fifth primary-side winding and the first ends of the seventh primary-side winding are connected to the three-phase resonant module. The second end of the resonant module, the second end of the fifth primary winding and the second end of the seventh primary winding are connected to the moving contact of the second single-pole double-throw switch; the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first stationary contact of the second single-pole double-throw switch; the first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the third end of the three-phase resonant module; the second end of the ninth primary winding, the second end of the eleventh primary winding, the first end of the tenth primary winding and the first end of the twelfth primary winding are all connected to the first end of the single-pole single-throw switch; the second stationary contact of the first single-pole double-throw switch and the second stationary contact of the second single-pole double-throw switch are both connected to the first end of the single-pole single-throw switch; the second end of the single-pole single-throw switch is connected to the second power input terminal.

2. A wide output voltage equalization and current equalization LLC circuit, characterized in that, It includes a three-phase inverter bridge module, a three-phase resonant module, a primary-side switching module, a first transformer module, a second transformer module, a third transformer module, a rectifier output module, and a secondary-side switching output module; The primary windings of the first, second, and third transformer modules are sequentially connected to the three-phase resonant module and the three-phase inverter bridge module, and their secondary windings are sequentially connected to the rectifier output module and the secondary winding switching output module. The first transformer module includes a first transformer unit and a second transformer unit; the second transformer module includes a third transformer unit and a fourth transformer unit; and the third transformer module includes a fifth transformer unit and a sixth transformer unit. The primary winding switching module is connected between the three-phase resonant module and the primary windings of the first, second, third, fourth, fifth, and sixth transformer units. The rectifier output module includes a first rectifier output unit, a second rectifier output unit, a third rectifier output unit, a fourth rectifier output unit, a fifth rectifier output unit, and a sixth rectifier output unit. The first rectifier output unit is connected to the first transformer unit. The secondary side of the transformer circuit includes a second rectifier output unit connected to the secondary side of the second transformer unit, a third rectifier output unit connected to the secondary side of the third transformer unit, a fourth rectifier output unit connected to the secondary side of the fourth transformer unit, a fifth rectifier output unit connected to the secondary side of the fifth transformer unit, and a sixth rectifier output unit connected to the secondary side of the sixth transformer unit. The secondary-side switching output module is connected to the secondary sides of the first, second, third, fourth, fifth, and sixth transformer units, as well as the first, second, third, fourth, fifth, and sixth rectifier output units. The primary-side switching module and the secondary-side switching output module are controlled to switch between multiple operating modes to output multiple different voltages for the wide output voltage equalization and current equalization LLC circuit. The first transformer unit includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding; the second transformer unit includes a third primary winding, a fourth primary winding, a third secondary winding, and a fourth secondary winding; the third transformer unit includes a fifth primary winding, a sixth primary winding, a fifth secondary winding, and a sixth secondary winding; the fourth transformer unit includes a seventh primary winding, an eighth primary winding, a seventh secondary winding, and an eighth secondary winding; the fifth transformer unit includes a ninth primary winding, a tenth primary winding, a ninth secondary winding, and a tenth secondary winding; the sixth transformer unit includes an eleventh primary winding, a twelfth primary winding, an eleventh secondary winding, and a twelfth secondary winding. The primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a first operating voltage in a first operating mode, a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the first operating voltage to the fifth operating voltage; or the primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the second operating voltage to the fifth operating voltage. The primary-side switching module includes a first single-pole double-throw switch, a second single-pole double-throw switch, a third single-pole double-throw switch, and a single-pole single-throw switch; the first end of the first primary-side winding and the first end of the third primary-side winding are connected to the first stationary contact of the first single-pole double-throw switch, and the moving contact of the first single-pole double-throw switch is connected to the first end of the three-phase resonant module; the second end of the first primary-side winding, the second end of the third primary-side winding, the first end of the second primary-side winding, and the first end of the fourth primary-side winding are connected to the second stationary contact of the first single-pole double-throw switch; the second end of the second primary-side winding, the second end of the fourth primary-side winding, the second end of the sixth primary-side winding, the second end of the eighth primary-side winding, the second end of the tenth primary-side winding, and the second end of the twelfth primary-side winding are all connected to the first end of the single-pole single-throw switch; the second end of the single-pole single-throw switch is connected to the first... Two power input terminals; the first end of the fifth primary winding and the first end of the seventh primary winding are connected to the first stationary contact of the second single-pole double-throw switch, and the moving contact of the second single-pole double-throw switch is connected to the second terminal of the three-phase resonant module; the second end of the fifth primary winding, the second end of the seventh primary winding, the first end of the sixth primary winding, and the first end of the eighth primary winding are connected to the second stationary contact of the second single-pole double-throw switch; the first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the first stationary contact of the third single-pole double-throw switch, and the moving contact of the third single-pole double-throw switch is connected to the third terminal of the three-phase resonant module; the second end of the ninth primary winding, the second end of the eleventh primary winding, the first end of the tenth primary winding, and the first end of the twelfth primary winding are connected to the second stationary contact of the third single-pole double-throw switch.

3. A wide output voltage equalization and current equalization LLC circuit, characterized in that, It includes a three-phase inverter bridge module, a three-phase resonant module, a primary-side switching module, a first transformer module, a second transformer module, a third transformer module, a rectifier output module, and a secondary-side switching output module; The primary windings of the first, second, and third transformer modules are sequentially connected to the three-phase resonant module and the three-phase inverter bridge module, and their secondary windings are sequentially connected to the rectifier output module and the secondary winding switching output module. The first transformer module includes a first transformer unit and a second transformer unit; the second transformer module includes a third transformer unit and a fourth transformer unit; and the third transformer module includes a fifth transformer unit and a sixth transformer unit. The primary winding switching module is connected between the three-phase resonant module and the primary windings of the first, second, third, fourth, fifth, and sixth transformer units. The rectifier output module includes a first rectifier output unit, a second rectifier output unit, a third rectifier output unit, a fourth rectifier output unit, a fifth rectifier output unit, and a sixth rectifier output unit. The first rectifier output unit is connected to the first transformer unit. The secondary side of the transformer circuit includes a second rectifier output unit connected to the secondary side of the second transformer unit, a third rectifier output unit connected to the secondary side of the third transformer unit, a fourth rectifier output unit connected to the secondary side of the fourth transformer unit, a fifth rectifier output unit connected to the secondary side of the fifth transformer unit, and a sixth rectifier output unit connected to the secondary side of the sixth transformer unit. The secondary-side switching output module is connected to the secondary sides of the first, second, third, fourth, fifth, and sixth transformer units, as well as the first, second, third, fourth, fifth, and sixth rectifier output units. The primary-side switching module and the secondary-side switching output module are controlled to switch between multiple operating modes to output multiple different voltages for the wide output voltage equalization and current equalization LLC circuit. The first transformer unit includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding; the second transformer unit includes a third primary winding, a fourth primary winding, a third secondary winding, and a fourth secondary winding; the third transformer unit includes a fifth primary winding, a sixth primary winding, a fifth secondary winding, and a sixth secondary winding; the fourth transformer unit includes a seventh primary winding, an eighth primary winding, a seventh secondary winding, and an eighth secondary winding; the fifth transformer unit includes a ninth primary winding, a tenth primary winding, a ninth secondary winding, and a tenth secondary winding; the sixth transformer unit includes an eleventh primary winding, a twelfth primary winding, an eleventh secondary winding, and a twelfth secondary winding. The primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a first operating voltage in a first operating mode, a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the first operating voltage to the fifth operating voltage; or the primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the second operating voltage to the fifth operating voltage. The primary-side switching module includes a first single-pole double-throw switch and a second single-pole double-throw switch; the first end of the first primary-side winding and the first end of the third primary-side winding are connected to the first end of the three-phase resonant module, the second end of the first primary-side winding and the second end of the third primary-side winding are connected to the moving contact of the first single-pole double-throw switch, and the first end of the second primary-side winding and the first end of the fourth primary-side winding are connected to the first stationary contact of the first single-pole double-throw switch; the second ends of the second primary-side winding, the second ends of the fourth primary-side winding, the second ends of the sixth primary-side winding, the second ends of the eighth primary-side winding, the second ends of the tenth primary-side winding, and the second ends of the twelfth primary-side winding are connected to each other; the fifth primary-side winding's... One end of the first primary winding is connected to the second end of the three-phase resonant module; the second end of the fifth primary winding and the second end of the seventh primary winding are connected to the moving contact of the second single-pole double-throw switch; the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first stationary contact of the second single-pole double-throw switch; the first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the third end of the three-phase resonant module; the second end of the ninth primary winding, the second end of the eleventh primary winding, the first end of the tenth primary winding, and the first end of the twelfth primary winding are all connected to the second stationary contact of the first single-pole double-throw switch and the second stationary contact of the second single-pole double-throw switch.

4. A wide output voltage equalization and current equalization LLC circuit, characterized in that, The system includes a three-phase inverter bridge module, a three-phase resonant module, a primary-side switching module, a first transformer module, a second transformer module, a third transformer module, a rectifier output module, and a secondary-side switching output module. The primary sides of the first, second, and third transformer modules are sequentially connected to the three-phase resonant module and the three-phase inverter bridge module, and their secondary sides are sequentially connected to the rectifier output module and the secondary-side switching output module. The first transformer module includes a first transformer unit and a second transformer unit; the second transformer module includes a third transformer unit and a fourth transformer unit; and the third transformer module includes a fifth transformer unit and a sixth transformer unit. The primary-side switching module is connected between the three-phase resonant module and the primary sides of the first, second, third, fourth, fifth, and sixth transformer units. The rectifier output module includes a first rectifier output unit, a second rectifier output unit, a third rectifier output unit, a fourth rectifier output unit, and a fifth rectifier output unit. The primary side and the secondary side are connected to the secondary side of the first transformer unit, the second transformer unit, the third transformer unit, the fourth transformer unit, the fifth transformer unit, and the sixth transformer unit. The secondary side switching output module is connected to the secondary sides of the first, second, third, fourth, fifth, and sixth transformer units, as well as the first, second, third, fourth, fifth, and sixth transformer units. The primary side switching module and the secondary side switching output module are controlled to switch the wide output voltage equalization and current equalization LLC circuit to operate in multiple different operating modes to output multiple different voltages. The first transformer unit includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding; the second transformer unit includes a third primary winding, a fourth primary winding, a third secondary winding, and a fourth secondary winding; the third transformer unit includes a fifth primary winding, a sixth primary winding, a fifth secondary winding, and a sixth secondary winding; the fourth transformer unit includes a seventh primary winding, an eighth primary winding, a seventh secondary winding, and an eighth secondary winding; the fifth transformer unit includes a ninth primary winding, a tenth primary winding, a ninth secondary winding, and a tenth secondary winding; the sixth transformer unit includes an eleventh primary winding, a twelfth primary winding, an eleventh secondary winding, and a twelfth secondary winding. The primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a first operating voltage in a first operating mode, a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the first operating voltage to the fifth operating voltage; or the primary-side switching module and the secondary-side switching output module work together to control the primary windings of each transformer unit to select different numbers of series turns and to control the secondary windings of each transformer unit to be connected in series or parallel, thereby outputting a second operating voltage in a second operating mode, a third operating voltage in a third operating mode, a fourth operating voltage in a fourth operating mode, or a fifth operating voltage in a fifth operating mode; wherein the voltage increases from the second operating voltage to the fifth operating voltage. The primary-side switching module includes a first single-pole double-throw switch, a second single-pole double-throw switch, and a third single-pole double-throw switch; the first end of the first primary-side winding and the first end of the third primary-side winding are connected to the first stationary contact of the first single-pole double-throw switch, and the moving contact of the first single-pole double-throw switch is connected to the first end of the three-phase resonant module; the second end of the first primary-side winding, the second end of the third primary-side winding, the first end of the second primary-side winding, and the first end of the fourth primary-side winding are connected to the second stationary contact of the first single-pole double-throw switch; the second ends of the second primary-side winding, the second end of the fourth primary-side winding, the second end of the sixth primary-side winding, the second end of the eighth primary-side winding, the second end of the tenth primary-side winding, and the second end of the twelfth primary-side winding are connected to each other; the first end of the fifth primary-side winding and The first end of the seventh primary winding is connected to the first stationary contact of the second single-pole double-throw switch, and the moving contact of the second single-pole double-throw switch is connected to the second end of the three-phase resonant module; the second end of the fifth primary winding, the second end of the seventh primary winding, the first end of the sixth primary winding, and the first end of the eighth primary winding are connected to the second stationary contact of the second single-pole double-throw switch; the first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the first stationary contact of the third single-pole double-throw switch, and the moving contact of the third single-pole double-throw switch is connected to the third end of the three-phase resonant module; the second end of the ninth primary winding, the second end of the eleventh primary winding, the first end of the tenth primary winding, and the first end of the twelfth primary winding are connected to the second stationary contact of the third single-pole double-throw switch.

5. The wide output voltage equalization and current equalization LLC circuit according to any one of claims 1-4, characterized in that, The first end of the first secondary winding and the second end of the second secondary winding are connected to the two input terminals of the first rectifier output unit; the first end of the third secondary winding and the second end of the fourth secondary winding are connected to the two input terminals of the second rectifier output unit; the first end of the fifth secondary winding and the second end of the sixth secondary winding are connected to the two input terminals of the third rectifier output unit; the first end of the seventh secondary winding and the second end of the eighth secondary winding are connected to the two input terminals of the fourth rectifier output unit; the first end of the ninth secondary winding and the second end of the tenth secondary winding are connected to the two input terminals of the fifth rectifier output unit; the first end of the eleventh secondary winding and the second end of the twelfth secondary winding are connected to the two input terminals of the sixth rectifier output unit; the second end of the first secondary winding and the first end of the second secondary winding are connected to each other; the second end of the third secondary winding and the first end of the fourth secondary winding are connected to each other; the second end of the fifth secondary winding and the first end of the sixth secondary winding are connected to each other; the second end of the seventh secondary winding and the second end of the twelfth secondary winding are connected to each other; the second end of the first secondary winding and the first end of the second secondary winding are connected to each other; the second end of the third secondary winding and the first end of the fourth secondary winding are connected to each other; the second end of the fifth secondary winding and the first end of the sixth secondary winding are connected to each other; the second end of the seventh secondary winding and the second end of the twelfth secondary winding are connected to each other; the second end of the first secondary winding and the second ... The second end of the first winding of the eighth secondary winding is connected to each other; the second end of the ninth secondary winding is connected to the first end of the tenth secondary winding; and the second end of the eleventh secondary winding is connected to the first end of the twelfth secondary winding. The connection points of the first and second secondary windings, the third and fourth secondary windings, and the fifth and sixth secondary windings are connected to each other to form a first winding connection point. The connection points of the seventh and eighth secondary windings, the ninth and tenth secondary windings, and the eleventh and twelfth secondary windings are connected to each other to form a second winding connection point. The output terminals of the first, third, and fifth rectifier output units are connected to each other to form a first rectifier output terminal. The output terminals of the second, fourth, and sixth rectifier output units are connected to each other to form a second rectifier output terminal.

6. The wide output voltage equalization and current equalization LLC circuit according to claim 5, characterized in that, The secondary-side switching output module includes a first secondary-side switch, a second secondary-side switch, and a third secondary-side switch; the first secondary-side switch is connected between the first winding connection point and the second rectifier output terminal, the second secondary-side switch is connected between the first rectifier output terminal and the second rectifier output terminal, and the third secondary-side switch is connected between the first winding connection point and the second winding connection point.

7. The wide output voltage equalization and current equalization LLC circuit according to claim 5, characterized in that, The first transformer module, the second transformer module, and the third transformer module each include N transformer units; the same-name terminals of the first primary windings of each of the first to N transformer units are connected to each other, and the opposite-name terminals of each of the first primary windings are connected to each other, and the same-name terminals of each of the second primary windings are connected to each other, and the opposite-name terminals of each of the second primary windings are connected to each other, where N equals 2.

8. The wide output voltage equalization and current equalization LLC circuit according to claim 6, characterized in that, The secondary-side switching output module further includes a first output capacitor and a second output capacitor; the first output capacitor is connected between the first rectifier output terminal and the first winding connection point, and the second output capacitor is connected between the second rectifier output terminal and the second winding connection point; The three-phase resonant module includes a first LC resonant unit, a second LC resonant unit, and a third LC resonant unit; the three-phase inverter bridge module includes an input capacitor, a first inverter unit, a second inverter unit, and a third inverter unit; the first end of the input capacitor is connected to a first power input terminal, a first input terminal of the first inverter unit, a first input terminal of the second inverter unit, and a first input terminal of the third inverter unit; the second end of the input capacitor is connected to a second power input terminal, a second input terminal of the first inverter unit, a second input terminal of the second inverter unit, and a second input terminal of the third inverter unit; the output terminal of the first inverter unit is connected to the first transformer module via the first LC resonant unit, the output terminal of the second inverter unit is connected to the second transformer module via the second LC resonant unit, and the output terminal of the third inverter unit is connected to the third transformer module via the third LC resonant unit.

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