A wide output voltage and current balancing LLC circuit

Abstract

The present invention relates to a wide output voltage equalizing and current balancing LLC circuit, comprising a three-phase inverter bridge module, a three-phase resonance module, a primary switching module, a rectifier output module, a secondary 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; the primary switching module is connected between the three-phase resonance module and the first-sixth transformer unit; the secondary switching output module is respectively connected to the first-sixth transformer unit and the rectifier output module; the primary switching module and the secondary switching output module are controlled to switch to control the wide output voltage equalizing and current balancing LLC circuit to operate in multiple different operating modes to output multiple different voltages. The wide output voltage equalizing and current balancing LLC circuit of the present invention can operate in multiple modes, output different operating voltages in the corresponding modes, and can achieve current balancing or voltage balancing.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and more particularly to an LLC circuit with wide output voltage and current balancing applicable to an electric vehicle charging module. Background Art

[0002] With the rapid development of electric vehicles, the power demand for their charging modules is increasing. To solve this problem, a multi-path parallel circuit is usually adopted. The greater the power, the more parallel paths there are. Figure 1 The present invention is a circuit diagram of a two-way full-bridge LLC interleaved parallel circuit in the prior art. Figure 2 This is a circuit diagram of a three-way full-bridge LLC interleaved parallel circuit in the prior art. However, these prior art circuits have the disadvantage that, due to the wide output voltage range, the output is a series-parallel switching circuit, and the transformer secondary side has cross windings. To achieve the purpose of interleaved parallel connection and reduce ripple, the switching frequency of each LLC must be consistent. Furthermore, due to some deviations in the actual resonant device parameters, the actual current in each circuit is inconsistent, which means that the current is not balanced between the circuits, and the output voltage cannot be balanced, resulting in the entire circuit not being able to operate stably and properly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that, in response to the above-mentioned defects of the prior art, a wide output voltage equalizing and current balancing LLC circuit is provided, which can operate in multiple modes, output different operating voltages in corresponding modes, and achieve wide voltage range and high power output with equal current or voltage balancing.

[0004] The present invention solves the technical problem by adopting a technical solution of constructing a wide output voltage and current balancing LLC circuit, which 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;

[0005] The primary sides of the first transformer module, the second transformer module and the third transformer module are sequentially connected to the three-phase resonance module and the three-phase inverter bridge module, and the secondary sides are sequentially connected to the rectifier output module and the secondary switching output module;

[0006] 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;

[0007] The primary switching module is connected between the three-phase resonance module and the primary of the first transformer unit, the primary of the second transformer unit, the primary of the third transformer unit, the primary of the fourth transformer unit, the primary of the fifth transformer unit, and the primary of the sixth transformer unit;

[0008] 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 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;

[0009] The secondary side switching output module is respectively connected to the secondary side of the first transformer unit, the secondary side of the second transformer unit, the secondary side of the third transformer unit, the secondary side of the fourth transformer unit, the secondary side of the fifth transformer unit, and the secondary side of the sixth transformer unit, as well as the first rectifier output 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;

[0010] The primary-side switching module and the secondary-side switching output module are controlled to switch to control the wide output voltage and current balancing LLC circuit to operate in multiple different operating modes to output multiple different voltages.

[0011] In the wide output voltage and current balancing LLC circuit described in the present invention, 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;

[0012] The primary switching module and the secondary switching output module work together to respectively control the primary winding of each transformer unit to select different series turns and control the secondary winding of each transformer unit to be connected in series or in parallel, thereby outputting a first working voltage in a first working mode, outputting a second working voltage in a second working mode, outputting a third working voltage in a third working mode, outputting a fourth working voltage in a fourth working mode, or outputting a fifth working voltage in a fifth working mode; wherein the first working voltage increases to the fifth working voltage; or

[0013] The primary switching module and the secondary switching output module work together to respectively control the primary winding of each transformer unit to select different series turns and control the secondary winding of each transformer unit to be connected in series or in parallel, thereby outputting the second operating voltage in the second operating mode, the third operating voltage in the third operating mode, the fourth operating voltage in the fourth operating mode, or the fifth operating voltage in the fifth operating mode; wherein the second operating voltage increases to the fifth operating voltage.

[0014] In the wide output voltage and current balancing LLC circuit of the present invention, 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;

[0015] 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, 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, the first end of the second primary winding and the first end of the fourth primary winding are connected to the first static contact of the first single-pole double-throw switch; 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 connected to each other;

[0016] 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, 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, and the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first static contact of the second single-pole double-throw switch;

[0017] 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 resonance module, 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 first end of the single-pole single-throw switch;

[0018] The second static contact of the first single-pole double-throw switch and the second static 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 end.

[0019] In the wide output voltage and current balancing LLC circuit of the present invention, 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;

[0020] The first end of the first primary winding and the first end of the third primary winding are connected to the first static 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 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 static contact of the first single-pole double-throw switch; 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; the second end of the single-pole single-throw switch is connected to the second power input end;

[0021] The first end of the fifth primary winding and the first end of the seventh primary winding are connected to the first static 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 static contact of the second single-pole double-throw switch;

[0022] The first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the first static 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 resonance 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 static contact of the third single-pole double-throw switch.

[0023] In the wide output voltage and current balancing LLC circuit of the present invention, the primary side switching module includes a first single-pole double-throw switch and a second single-pole double-throw switch;

[0024] 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, 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, the first end of the second primary winding and the first end of the fourth primary winding are connected to the first static contact of the first single-pole double-throw switch; 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 connected to each other;

[0025] 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, 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, and the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first static contact of the second single-pole double-throw switch;

[0026] 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 resonance module, 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 static contact of the first single-pole double-throw switch and the second static contact of the second single-pole double-throw switch.

[0027] In the wide output voltage and current balancing LLC circuit of the present invention, 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;

[0028] The first end of the first primary winding and the first end of the third primary winding are connected to the first static 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 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 static contact of the first single-pole double-throw switch; 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 connected to each other;

[0029] The first end of the fifth primary winding and the first end of the seventh primary winding are connected to the first static 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 static contact of the second single-pole double-throw switch;

[0030] The first end of the ninth primary winding and the first end of the eleventh primary winding are connected to the first static 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 resonance 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 static contact of the third single-pole double-throw switch.

[0031] In the wide output voltage and current balancing LLC circuit described in the present invention, the first end of the first secondary winding and the second end of the second secondary winding are connected to the two input ends 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 ends 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 ends 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 ends 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 first rectifier output unit. two input ends of the element; the first end of the eleventh secondary winding and the second end of the twelfth secondary winding are connected to the two input ends 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 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;

[0032] The connection point of the first secondary winding and the second secondary winding, the connection point of the third secondary winding and the fourth secondary winding, and the connection point of the fifth secondary winding and the sixth secondary winding are connected to each other to form a first winding connection point; the connection point of the seventh secondary winding and the eighth secondary winding, the connection point of the ninth secondary winding and the tenth secondary winding, and the connection point of the eleventh secondary winding and the twelfth secondary winding are connected to each other to form a second winding connection point;

[0033] The output end of the first rectifier output unit, the output end of the third rectifier output unit and the output end of the fifth rectifier output unit are connected to each other to form a first rectifier output end; the output end of the second rectifier output unit, the output end of the fourth rectifier output unit and the output end of the sixth rectifier output unit are connected to each other to form a second rectifier output end.

[0034] In the wide output voltage and current balancing LLC circuit described in the present invention, 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 end, the second secondary side switch is connected between the first rectifier output end and the second rectifier output end, and the third secondary side switch is connected between the first winding connection point and the second winding connection point.

[0035] In the wide output voltage and current balancing LLC circuit described in the present invention, the first transformer module, the second transformer module and the transformer module respectively include N transformer units; the like-name ends of the first primary windings of the first to Nth transformer units are connected to each other, the opposite-name ends of the first primary windings are connected to each other, the like-name ends of the second primary windings are connected to each other, and the opposite-name ends of the second primary windings are connected to each other, where N is a positive integer greater than 2.

[0036] In the wide output voltage and current balancing LLC circuit described in the present invention, 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 end and the first winding connection point, and the second output capacitor is connected between the second rectifier output end and the second winding connection point.

[0037] In the wide output voltage and current balancing LLC circuit described in the present invention, the three-phase resonance module includes a first LC resonance unit, a second LC resonance unit and a third LC resonance unit; the three-phase inverter bridge module includes an output capacitor, a first inverter unit, a second inverter unit and a third inverter unit; the first end of the input capacitor is connected to the first power input end, the first input end of the first inverter unit, the first input end of the second inverter unit and the first input end of the third inverter unit; the second end of the input capacitor is connected to the second power input end, the second input end of the first inverter unit, the second input end of the second inverter unit and the second input end of the third inverter unit; the output end of the first inverter unit is connected to the first transformer module via the first LC resonance unit, the output end of the second inverter unit is connected to the second transformer module via the second LC resonance unit, and the output end of the third inverter unit is connected to the third transformer module via the third LC resonance unit.

[0038] Therefore, the wide output voltage and current balancing LLC circuit of the present invention can operate in multiple modes, output different operating voltages in corresponding modes, and achieve current or voltage balancing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0040] Figure 1 This is a circuit diagram of a two-way full-bridge LLC interleaved parallel circuit in the prior art;

[0041] Figure 2 This is a circuit diagram of a three-way full-bridge LLC interleaved parallel circuit in the prior art;

[0042] Figure 3 This is a principle block diagram of a preferred embodiment of the LLC circuit for wide output voltage and current sharing of the present invention;

[0043] Figure 4 1 is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention;

[0044] Figure 5 yes Figure 4 Schematic diagram of transformer windings of the wide output voltage and current balancing LLC circuit shown;

[0045] Figure 6 yes Figure 4 A circuit diagram of a wide output voltage and current balancing LLC circuit in one operating mode is shown;

[0046] Figure 7 yes Figure 4A circuit diagram of another working mode of the wide output voltage and current balancing LLC circuit shown;

[0047] Figure 8 yes Figure 4 Schematic diagram of the switching conditions of the switching devices in different working modes of the wide output voltage and current balancing LLC circuit shown;

[0048] Figure 9 yes Figure 4 The schematic diagram of a partial equivalent circuit of a wide output voltage and current balancing LLC circuit shown in FIG. 1 is a schematic diagram of a partial equivalent circuit of a wide output voltage and current balancing LLC circuit when the secondary winding output is connected in parallel;

[0049] Figure 10 This is a circuit diagram of a transformer expansion of the wide output voltage and current balancing LLC circuit of the present invention;

[0050] Figure 11 1 is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention;

[0051] Figure 12 1 is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention;

[0052] Figure 13 It is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0054] Figure 3 FIG1 shows a principle block diagram of a preferred embodiment of a wide output voltage and current balancing LLC circuit of the present invention. Figure 3 As shown, the wide output voltage and current balancing LLC circuit of the present invention includes a three-phase inverter bridge module 100, a three-phase resonance module 700, a primary 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 switching output module 600. Figure 3As shown, 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 resonance 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 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 switching module 500 is connected between the three-phase resonance module 700 and 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.

[0055] 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 respectively connected to the secondary side of the first transformer unit 210, the secondary side of the second transformer unit 220, the secondary side of the third transformer unit 310, the secondary side of the fourth transformer unit 320, the secondary side of the fifth transformer unit 410 and the secondary side of 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.

[0056] The primary-side switching module 500 and the secondary-side switching output module 600 are controlled to switch to control the wide output voltage and current balancing LLC circuit to operate in multiple different operating modes to output multiple different voltages.

[0057] In a preferred embodiment of the present invention, the three-phase inverter bridge module 100 can adopt 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 adopt any suitable structure, such as a switch tube or a diode. The three-phase resonant module 700 can adopt 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 end, the first input end of the first inverter unit, the first input end of the second inverter unit and the first input end of the third inverter unit; the second end of the input capacitor is connected to the second power input end, the second input end of the first inverter unit, the second input end of the second inverter unit and the second input end of the third inverter unit; the output end of the first inverter unit is connected to the first transformer module 200 via the first LC resonance unit, the output end of the second inverter unit is connected to the second transformer module 300 via the second LC resonance unit, and the output end of the third inverter unit is connected to the third transformer module 400 via the third LC resonance unit.

[0058] 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. Figure 10 As shown, 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 same name of the first to Nth transformer units are connected in parallel. Figure 10 As shown, the like-named ends of the first primary windings of the first to Nth transformer units are connected to each other, the different-named ends of the first primary windings are connected to each other, the like-named ends of the second primary windings are connected to each other, and the different-named ends of the second primary windings are connected to each other, where N is a positive integer greater than 2.

[0059] In the subsequent embodiments of the present invention, each transformer unit is described as including two groups 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.

[0060] In a preferred embodiment of the present invention, each rectifier output unit may be a diode rectifier output unit or a switch tube rectifier output unit, all of which fall within the protection scope of the present invention.

[0061] In a preferred embodiment of the present invention, the primary switching module 500 and the secondary switching output module 600 may include multiple switching devices that work in conjunction with each other to control the primary windings of each transformer unit to select different numbers of series turns and control the secondary windings of each transformer unit to be connected in series or in 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 first operating voltage increases to the fifth operating voltage. When the multiple transformer units operate in series, the secondary windings of the transformers are current-balanced. When the multiple transformers operate in parallel, since they are connected to the rectifier output unit, current balancing can be achieved by adjusting the device values of the rectifier output unit.

[0062] It should be noted that the structure and connection relationship of the secondary side switching output module 600 and the rectifier output unit can adopt any suitable switch devices and connection relationship structure known in the art, which all fall within the protection scope of the present invention.

[0063] Therefore, the wide output voltage and current balancing LLC circuit of the present invention can operate in multiple modes, output different operating voltages in corresponding modes, and achieve current or voltage balancing.

[0064] Figure 4 FIG. 1 is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention. Figure 4 As shown, the wide output voltage and current balancing LLC circuit of the present invention includes a three-phase inverter bridge module 100, a three-phase resonance 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.

[0065] The three-phase inverter bridge module 100 includes an input capacitor C1 and switches Q1-Q6. The three-phase resonant module 700 includes three sets of series-connected resonant inductors L1 and resonant capacitors C2. The first end of the input capacitor C1 is connected to the drains of the switches Q1-Q3 and the first power input, and the second end is connected to the sources of the switches Q4-Q6 and the second power input. Switches Q1 and Q4 are connected in series, switches Q2 and Q5 are connected in series, and switches Q3 and Q6 are connected in series. Their connection points are each connected to a set of resonant inductors L1 and resonant capacitors C2, which are then connected to the corresponding transformer modules.

[0066] 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. Figure 5 As shown, each transformer includes primary windings P1 and P2, and secondary windings N1 and N2, that is, the transformer T1 includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding; the transformer T2 includes a third primary winding, a fourth primary winding, a third secondary winding, and a fourth secondary winding; the transformer T3 includes a fifth primary winding, a sixth primary winding, a fifth secondary winding, and a sixth secondary winding; the transformer T4 includes a seventh primary winding, an eighth primary winding, a seventh secondary winding, and an eighth secondary winding; the transformer T5 includes a ninth primary winding, a tenth primary winding, a ninth secondary winding, and a tenth secondary winding; the 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 present invention, it can be as follows Figure 10 The number of transformers shown in the figure is expanded, that is, the number of transformers in parallel N≥2, to support the realization of high-power equalized voltage and current output. Figure 10 As shown, 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 same name of the first to Nth transformer units are connected in parallel. Figure 10 As shown, the like-named ends of the first primary windings of the first to Nth transformer units are connected to each other, the different-named ends of the first primary windings are connected to each other, the like-named ends of the second primary windings are connected to each other, and the different-named ends of the second primary windings are connected to each other, where N is a positive integer greater than 2.

[0067] The primary 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 switching output module 600 includes a first secondary switch K4, a second secondary switch K5, a third secondary 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 form the output end of the rectifier output unit, and the anodes serve as the two input ends of the rectifier output unit and are connected to the corresponding secondary windings.

[0068] like Figure 3As shown, 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 resonance module 700 (i.e., the first end of the first group of resonant inductors L1 and resonant capacitors C2, and the second ends of the first group of resonant inductors L1 and resonant capacitors C2 are connected to the connection point of the switch tubes 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, and the first end of the second primary winding and the first end of the fourth primary winding are connected to the first static 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 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 resonance module 700 (i.e., the first end of the second group of resonant inductor L1 and resonant capacitor C2, and the second end of the second group of resonant inductor L1 and resonant capacitor C2 is connected to the connection point of the switch tubes 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 static 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 end of the three-phase resonance module 700 (i.e., the first end of the third group of resonant inductor L1 and resonant capacitor C2, the second end of the first group of resonant inductor L1 and resonant capacitor C2 is connected to the connection point of the switch tubes Q3 and Q6), 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 K3; the second static contact of the first single-pole double-throw switch K1 and the second static contact of the second single-pole double-throw switch K2 are both 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 supply input end.

[0069] The first end of the first secondary winding and the second end of the second secondary winding are connected to the two input ends 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 ends 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 ends 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 ends 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 ends of the first rectifier output unit 510. end; the first end of the eleventh secondary winding and the second end of the twelfth secondary winding are connected to the two input ends 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 point between the first and second secondary windings, the connection point between the third and fourth secondary windings, and the connection point between the fifth and sixth secondary windings are connected to form a first winding connection point A. The connection point between the seventh and eighth secondary windings, the connection point between the ninth and tenth secondary windings, and the connection point between the eleventh and twelfth secondary windings are connected to form a second winding connection point B. The output end of the first rectifier output unit 510, the output end of the third rectifier output unit 530, and the output end of the fifth rectifier output unit 550 are connected to form a first rectifier output end C. The output end of the second rectifier output unit 520, the output end of the fourth rectifier output unit 540, and the output end of the sixth rectifier output unit 560 are connected to form a second rectifier output end D.

[0070] 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.

[0071] In a preferred embodiment of the present 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 relay switches. Of course, switching tubes or other switching devices may also be used to implement the present invention.

[0072] Figure 6 yes Figure 4 The circuit diagram of the wide output voltage and current balancing LLC circuit in one working mode is shown. Figure 7 yes Figure 4 The circuit diagram of the wide output voltage and current balancing LLC circuit in another working mode is shown. Figure 8 yes Figure 4 The figure shows a schematic diagram of the switching conditions of the switching devices in different working modes of the wide output voltage and current sharing LLC circuit. Figure 9 yes Figure 4 The following is a partial equivalent circuit diagram of the wide output voltage and current LLC circuit when the secondary winding output is connected in parallel. Figure 6-8 right Figure 4 The working principle of the wide output voltage and current balancing LLC circuit shown is described as follows.

[0073] like Figure 6-9 As shown, the primary side of the wide output voltage and current balancing LLC circuit is a three-phase full-bridge LLC circuit. In order to better work in a wide output voltage, each transformer includes two primary windings. The specific structure of the winding is as follows: Figure 5 As shown. Due to the addition of 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 high number of turns of the primary winding (i.e., Figure 4 As shown, the primary windings P1 and P2 of the same transformer are connected in series and then in parallel with each other), and the primary winding has a low number of turns (i.e. Figure 6-7 As shown, 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, transformers T3-T4, and transformers T5-T6 are connected in parallel respectively). By switching the single-pole single-throw switch K3, the wide output voltage and current balancing LLC circuit can be decoupled into different LLC circuits. Figure 4 and 6 As shown in FIG, when the SPST switch K3 is disconnected, the wide output voltage and current balancing LLC circuit is a three-phase "Y" type LLC circuit. Figure 7 As shown, when the single-pole single-throw switch K3 is closed, the wide output voltage and current sharing LLC circuit is decoupled into three independent half-bridge LLC circuits.

[0074] like Figure 8 As shown, when the moving contact of the first single-pole double-throw switch K1 is connected to the second static contact, the moving contact of the second single-pole double-throw switch K1 is connected to the second static contact, and the single-pole single-throw switch K3 is energized, the first secondary switch K4 is disconnected, 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 cut into the low-turn winding, the primary windings P1 of different transformers are connected in parallel with each other, the primary side of the wide output voltage equalizing and current sharing LLC circuit is decoupled into three independent half-bridge LLC circuits, and the secondary side output of the wide output voltage equalizing and current sharing LLC circuit operates in parallel mode, so the wide output voltage equalizing and current sharing LLC circuit operates in the first working mode and outputs the first working voltage.

[0075] When the moving contact of the first single-pole double-throw switch K1 is connected to the second static contact, the moving contact of the second single-pole double-throw switch K1 is connected to the second static contact, and the single-pole single-throw switch K3 is disconnected, the first secondary switch K4 is disconnected, 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 cut into the low-turn winding, the primary windings P1 of different transformers are connected in parallel with each other, the primary side of the wide output voltage equalizing and current sharing LLC circuit is a three-phase "Y" type connected LLC circuit, and the secondary side output of the wide output voltage equalizing and current sharing LLC circuit operates in parallel mode, so the wide output voltage equalizing and current sharing LLC circuit operates in the second working mode and outputs the second working voltage.

[0076] When the moving contact of the first single-pole double-throw switch K1 is connected to the first static contact, the moving contact of the second single-pole double-throw switch K1 is connected to the first static contact, and the single-pole single-throw switch K3 is disconnected, the first secondary switch K4 is disconnected, 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 cut into the high-turn winding, the primary windings P1 and P2 of the same transformer are connected in series and then in parallel with each other, the primary side of the wide output voltage equalizing and current sharing LLC circuit is a three-phase "Y" type connection LLC circuit, and the secondary side output of the wide output voltage equalizing and current sharing LLC circuit operates in parallel mode, so the wide output voltage equalizing and current sharing LLC circuit operates in the third working mode and outputs the third working voltage.

[0077] When the moving contact of the first single-pole double-throw switch K1 is connected to the second static contact, the moving contact of the second single-pole double-throw switch K1 is connected to the second static contact, and the single-pole single-throw switch K3 is disconnected, the first secondary switch K4 is energized, and the second secondary switch K5 and the third secondary switch K6 are disconnected, that is, the first single-pole double-throw switch K1 and the second single-pole double-throw switch K1 are cut into the low-turn winding, the primary windings P1 of different transformers are connected in parallel with each other, the primary side of the wide output voltage equalizing and current sharing LLC circuit is a three-phase "Y" type connected LLC circuit, and the secondary side output of the wide output voltage equalizing and current sharing LLC circuit operates in series mode, so the wide output voltage equalizing and current sharing LLC circuit operates in the fourth operating mode and outputs the fourth operating voltage.

[0078] When the moving contact of the first single-pole double-throw switch K1 is connected to the first static contact, the moving contact of the second single-pole double-throw switch K1 is connected to the first static contact, and the single-pole single-throw switch K3 is disconnected, the first secondary switch K4 is closed, and the second secondary switch K5 and the third secondary switch K6 are disconnected, that is, the first single-pole double-throw switch K1 and the second single-pole double-throw switch K1 are cut into the high-turn winding, the primary windings P1 and P2 of the same transformer are connected in series and then in parallel with each other, the primary side of the wide output voltage equalizing and current sharing LLC circuit is a three-phase "Y" type connected LLC circuit, and the secondary side output of the wide output voltage equalizing and current sharing LLC circuit operates in the series mode, so the wide output voltage equalizing and current sharing LLC circuit operates in the fifth working mode and outputs the fifth working voltage.

[0079] Therefore, it can be seen that through Figure 8 As shown in the state combination of the first single-pole double-throw switch K1, the second single-pole double-throw switch K2, the single-pole single-throw switch K3, the first secondary switch K4, the second secondary switch K5 and the third secondary switch K6, the wide output voltage and current balancing LLC circuit can operate in five working modes and output five working voltages from low to high, thereby achieving a wide range of voltage output.

[0080] Furthermore, when the primary side of the wide output voltage and current balancing LLC circuit is a three-phase "Y" type connected LLC circuit, the switch tube of the wide output voltage and current balancing LLC circuit will hard switch when the duty cycle is adjusted, and the single-pole single-throw switch K3 can be attracted to achieve decoupling of the three-phase LLC, so that a single-channel LLC circuit can operate in the duty cycle adjustment mode to achieve a lower voltage output.

[0081] When the first secondary switch K4 is closed and the second secondary switch K5 and the third secondary switch K6 are open, the secondary output of the wide output voltage and current balancing LLC circuit operates in series mode, thereby automatically achieving current balancing.

[0082] When the first secondary switch K4 is disconnected and the second secondary switch K5 and the third secondary switch K6 are closed, the secondary output of the wide output voltage equalizing and current balancing LLC circuit operates in parallel mode, so voltage balancing can be automatically achieved. At this time, the secondary winding of the transformer of the wide output voltage equalizing and current balancing LLC circuit is also in parallel mode. Due to the consistency of the voltage drop of the secondary diode, it may cause uneven current sharing between the transformer and the diode. At this time, the equivalent circuit of the transformer of each transformer unit and the diode of its corresponding rectifier unit is as follows: Figure 9 As shown, Lr1, Lr2, Lr3, and Lr4 are the leakage inductances of the secondary windings N1 and N2 of transformers T1 and T2, respectively. The leakage inductance value of leakage inductance Lr1 and Lr3 is L. The current of diode D1 is I1 and the voltage drop is Vf1. The current of diode D2 is I2 and the voltage drop is Vf2. The operating frequency is f. It can be derived that I1-I2=(Vf2-Vf1) / (2π*f*L). It can be seen from the above formula that the current difference in this branch is inversely proportional to the frequency and inductance. When the frequency f and the inductance L take appropriate values, the current difference between the diode branch where diode D1 is located and the diode branch where diode D3 is located can be controlled to a small value, thereby achieving a better current sharing effect.

[0083] Therefore, the wide output voltage and current balancing LLC circuit of the present invention can operate in multiple modes and output different operating voltages in the corresponding modes and can achieve current or voltage balancing. In this preferred embodiment, through the introduction of multiple switching devices, the wide output voltage and current balancing LLC circuit of the present invention can operate in multiple modes, achieving a wide voltage range and high power output of the LLC circuit with voltage balancing, and can support N ≥ 2 transformers in parallel to achieve unlimited power expansion.

[0084] Figure 11 This is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention. Figure 11 In the preferred embodiment shown, its principles and connection relationships are basically the same as those in Figure 4 The embodiment shown is similar, and the difference lies mainly in the design of the primary switching module 500. The primary switching module 500 and its connection relationship with related modules are mainly described below.

[0085] like Figure 11As shown, the primary 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 static 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 resonance 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 static 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 first end of the seventh primary winding are connected to the first end of the single-pole double-throw switch K3; The first end of the primary winding is connected to the first static 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 resonance 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 static 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 static 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 resonance 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 static contact of the third single-pole double-throw switch K7.

[0086] exist Figure 11 In the preferred embodiment shown, 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 switched between the first static contact and the second static contact to select the high-turn winding or the low-turn winding. The output voltage and current balancing LLC circuit is decoupled into a three-phase "Y" type 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 working mode are similar to Figure 8 The operation shown is the same, except that K1 and K2 are switched into the high-turn winding or the low-turn winding instead of K1, K2 and K7, which are switched into the high-turn winding or the low-turn winding. It will not be repeated here.

[0087] Figure 12 This is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention. Figure 12In the preferred embodiment shown, its principles and connection relationships are basically the same as those in Figure 4 The embodiment shown is similar, and the difference lies in the design of the primary switching module 500. The primary switching module 500 and its connection relationship with related modules are described below. Figure 12 The embodiment shown follows Figure 4 Compared with the embodiment shown in FIG, the single-pole single-throw switch K3 is removed, so that the single-pole single-throw switch K3 is always in the disconnected state.

[0088] like Figure 12 As shown, the primary 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 resonance 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 static 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 connected to each other; the first end of the fifth primary winding and the first end of the seventh primary winding are connected The second end of the three-phase resonance 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, and the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first static 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 resonance 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 static contact of the first single-pole double-throw switch K1 and the second static contact of the second single-pole double-throw switch K2.

[0089] exist Figure 12 In the preferred embodiment shown, the moving contacts of the first single-pole double-throw switch K1 and the second single-pole double-throw switch K2 are switched between the first static contact and the second static contact to select the high-turn winding or the low-turn winding. The single-pole single-throw switch K3 is removed, so it is equivalent to the single-pole single-throw switch K3 being always in the off state. Therefore, it only includes four working modes, namely, Figure 8 The second working mode to the fourth working mode shown will not be described again here.

[0090] Figure 13This is a circuit diagram of a preferred embodiment of the wide output voltage and current balancing LLC circuit of the present invention. Figure 13 In the preferred embodiment shown, its principles and connection relationships are basically the same as those in Figure 4 The embodiment shown is similar, and the difference lies in the design of the primary switching module 500. The primary switching module 500 and its connection relationship with related modules are described below. Figure 13 The embodiment shown follows Figure 11 Compared with the embodiment shown in FIG, the single-pole single-throw switch K3 is removed, so that the single-pole single-throw switch K3 is always in the disconnected state.

[0091] like Figure 13 As shown, the primary 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 winding and the first end of the third primary winding are connected to the first static 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 resonance 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 static 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 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 first static 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 resonance 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 static 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 static 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 resonance 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 static contact of the third single-pole double-throw switch K7.

[0092] exist Figure 13In the preferred embodiment shown, 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 switched between the first and second static contacts to select the high-turn winding or the low-turn winding. The single-pole single-throw switch K3 is removed, so it is equivalent to the single-pole single-throw switch K3 being always in the off state. Therefore, it only includes four operating modes, namely, Figure 8 The second working mode to the fourth working mode shown will not be described again here.

[0093] Therefore, the wide output voltage equalizing and current balancing LLC circuit of the present invention can operate in multiple modes, output different operating voltages in the corresponding modes, and can achieve current balancing or voltage balancing. In this preferred embodiment, through the introduction of multiple switching devices, the wide output voltage equalizing and current balancing LLC circuit of the present invention can operate in multiple modes, realize the wide voltage range and high power output of the LLC circuit for voltage balancing, and support N≥2 transformers in parallel to achieve unlimited power expansion. By sharing the switching devices in parallel through the transformer windings, the number of switching switching devices can be reduced, the circuit is simple, the devices are relatively few, the performance is excellent, and the practical value is very high.

[0094] Although the present invention is described by way of specific embodiments, it will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. Furthermore, various modifications may be made to the present invention for specific circumstances or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but is intended to encompass all embodiments falling within the scope of the claims.

[0095] 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 and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wide output voltage and current balancing LLC circuit, characterized in that: It includes a three-phase inverter bridge module, a three-phase resonance 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 resonance module and the three-phase inverter bridge module, and the secondary sides are sequentially connected to the rectifier output module and the secondary 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 switching module is connected between the three-phase resonance module and the primary of the first transformer unit, the primary of the second transformer unit, the primary of the third transformer unit, the primary of the fourth transformer unit, the primary of the fifth transformer unit, and the primary of the sixth transformer unit; 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 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; The secondary side switching output module is respectively connected to the secondary side of the first transformer unit, the secondary side of the second transformer unit, the secondary side of the third transformer unit, the secondary side of the fourth transformer unit, the secondary side of the fifth transformer unit, and the secondary side of the sixth transformer unit, as well as the first rectifier output 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 to control the wide output voltage and current balancing 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 switching module and the secondary switching output module work together to respectively control the primary winding of each transformer unit to select different series turns and control the secondary winding of each transformer unit to be connected in series or in parallel, thereby outputting a first working voltage in a first working mode, outputting a second working voltage in a second working mode, outputting a third working voltage in a third working mode, outputting a fourth working voltage in a fourth working mode, or outputting a fifth working voltage in a fifth working mode; wherein the first working voltage increases to the fifth working voltage; or The primary switching module and the secondary switching output module work together to respectively control the primary windings of each transformer unit to select different numbers of series turns and control the secondary windings of each transformer unit to be connected in series or in parallel, thereby outputting a second operating voltage in the second operating mode, a third operating voltage in the third operating mode, a fourth operating voltage in the fourth operating mode, or a fifth operating voltage in the fifth operating mode; wherein the second operating voltage increases 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 winding and the first end of the third primary winding are connected to the first end of the three-phase resonant module, 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, the first end of the second primary winding and the first end of the fourth primary winding are connected to the first static contact of the first single-pole double-throw switch; 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 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, 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, and the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first static 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 resonance module, 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 first end of the single-pole single-throw switch; The second static contact of the first single-pole double-throw switch and the second static 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 end.

2. A wide output voltage and current balancing LLC circuit, characterized in that: It includes a three-phase inverter bridge module, a three-phase resonance 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 resonance module and the three-phase inverter bridge module, and the secondary sides are sequentially connected to the rectifier output module and the secondary 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 switching module is connected between the three-phase resonance module and the primary of the first transformer unit, the primary of the second transformer unit, the primary of the third transformer unit, the primary of the fourth transformer unit, the primary of the fifth transformer unit, and the primary of the sixth transformer unit; 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 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; The secondary side switching output module is respectively connected to the secondary side of the first transformer unit, the secondary side of the second transformer unit, the secondary side of the third transformer unit, the secondary side of the fourth transformer unit, the secondary side of the fifth transformer unit, and the secondary side of the sixth transformer unit, as well as the first rectifier output 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 to control the wide output voltage and current balancing 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 switching module and the secondary switching output module work together to respectively control the primary winding of each transformer unit to select different series turns and control the secondary winding of each transformer unit to be connected in series or in parallel, thereby outputting a first working voltage in a first working mode, outputting a second working voltage in a second working mode, outputting a third working voltage in a third working mode, outputting a fourth working voltage in a fourth working mode, or outputting a fifth working voltage in a fifth working mode; wherein the first working voltage increases to the fifth working voltage; or The primary switching module and the secondary switching output module work together to respectively control the primary windings of each transformer unit to select different numbers of series turns and control the secondary windings of each transformer unit to be connected in series or in parallel, thereby outputting a second operating voltage in the second operating mode, a third operating voltage in the third operating mode, a fourth operating voltage in the fourth operating mode, or a fifth operating voltage in the fifth operating mode; wherein the second operating voltage increases 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 winding and the first end of the third primary winding are connected to the first static 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 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 static contact of the first single-pole double-throw switch; 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; the second end of the single-pole single-throw switch is connected to the second power input end; The first end of the fifth primary winding and the first end of the seventh primary winding are connected to the first static 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 static 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 static 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 resonance 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 static contact of the third single-pole double-throw switch.

3. A wide output voltage and current balancing LLC circuit, characterized in that: It includes a three-phase inverter bridge module, a three-phase resonance 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 resonance module and the three-phase inverter bridge module, and the secondary sides are sequentially connected to the rectifier output module and the secondary 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 switching module is connected between the three-phase resonance module and the primary of the first transformer unit, the primary of the second transformer unit, the primary of the third transformer unit, the primary of the fourth transformer unit, the primary of the fifth transformer unit, and the primary of the sixth transformer unit; 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 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; The secondary side switching output module is respectively connected to the secondary side of the first transformer unit, the secondary side of the second transformer unit, the secondary side of the third transformer unit, the secondary side of the fourth transformer unit, the secondary side of the fifth transformer unit, and the secondary side of the sixth transformer unit, as well as the first rectifier output 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 to control the wide output voltage and current balancing 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 switching module and the secondary switching output module work together to respectively control the primary winding of each transformer unit to select different series turns and control the secondary winding of each transformer unit to be connected in series or in parallel, thereby outputting a first working voltage in a first working mode, outputting a second working voltage in a second working mode, outputting a third working voltage in a third working mode, outputting a fourth working voltage in a fourth working mode, or outputting a fifth working voltage in a fifth working mode; wherein the first working voltage increases to the fifth working voltage; or The primary switching module and the secondary switching output module work together to respectively control the primary windings of each transformer unit to select different numbers of series turns and control the secondary windings of each transformer unit to be connected in series or in parallel, thereby outputting a second operating voltage in the second operating mode, a third operating voltage in the third operating mode, a fourth operating voltage in the fourth operating mode, or a fifth operating voltage in the fifth operating mode; wherein the second operating voltage increases 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 winding and the first end of the third primary winding are connected to the first end of the three-phase resonant module, 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, the first end of the second primary winding and the first end of the fourth primary winding are connected to the first static contact of the first single-pole double-throw switch; 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 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, 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, and the first end of the sixth primary winding and the first end of the eighth primary winding are connected to the first static 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 resonance module, 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 static contact of the first single-pole double-throw switch and the second static contact of the second single-pole double-throw switch.

4. A wide output voltage and current balancing LLC circuit, characterized in that: It includes a three-phase inverter bridge module, a three-phase resonance 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 resonance module and the three-phase inverter bridge module, and the secondary sides are sequentially connected to the rectifier output module and the secondary 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 switching module is connected between the three-phase resonance module and the primary of the first transformer unit, the primary of the second transformer unit, the primary of the third transformer unit, the primary of the fourth transformer unit, the primary of the fifth transformer unit, and the primary of the sixth transformer unit; 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 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; The secondary side switching output module is respectively connected to the secondary side of the first transformer unit, the secondary side of the second transformer unit, the secondary side of the third transformer unit, the secondary side of the fourth transformer unit, the secondary side of the fifth transformer unit, and the secondary side of the sixth transformer unit, as well as the first rectifier output 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 to control the wide output voltage and current balancing 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 switching module and the secondary switching output module work together to respectively control the primary winding of each transformer unit to select different series turns and control the secondary winding of each transformer unit to be connected in series or in parallel, thereby outputting a first working voltage in a first working mode, outputting a second working voltage in a second working mode, outputting a third working voltage in a third working mode, outputting a fourth working voltage in a fourth working mode, or outputting a fifth working voltage in a fifth working mode; wherein the first working voltage increases to the fifth working voltage; or The primary switching module and the secondary switching output module work together to respectively control the primary windings of each transformer unit to select different numbers of series turns and control the secondary windings of each transformer unit to be connected in series or in parallel, thereby outputting a second operating voltage in the second operating mode, a third operating voltage in the third operating mode, a fourth operating voltage in the fourth operating mode, or a fifth operating voltage in the fifth operating mode; wherein the second operating voltage increases 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 winding and the first end of the third primary winding are connected to the first static 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 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 static contact of the first single-pole double-throw switch; 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 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 first static 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 static 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 static 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 resonance 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 static contact of the third single-pole double-throw switch.

5. The LLC circuit with wide output voltage and current sharing according to any one of claims 1 to 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 ends 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 ends 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 ends 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 ends 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 ends of the fifth rectifier output unit; the tenth secondary winding and the second end of the ninth secondary winding are connected to the two input ends of the fifth rectifier output unit; a first end of a secondary winding and a second end of the twelfth secondary winding are connected to two input ends of the sixth rectifier output unit; a second end of the first secondary winding and a first end of the second secondary winding are connected to each other, a second end of the third secondary winding and a first end of the fourth secondary winding are connected to each other, a second end of the fifth secondary winding and a first end of the sixth secondary winding are connected to each other, a second end of the seventh secondary winding and a first end of the eighth secondary winding are connected to each other, a second end of the ninth secondary winding and a first end of the tenth secondary winding are connected to each other, and a second end of the eleventh secondary winding and a first end of the twelfth secondary winding are connected to each other; The connection point of the first secondary winding and the second secondary winding, the connection point of the third secondary winding and the fourth secondary winding, and the connection point of the fifth secondary winding and the sixth secondary winding are connected to each other to form a first winding connection point; the connection point of the seventh secondary winding and the eighth secondary winding, the connection point of the ninth secondary winding and the tenth secondary winding, and the connection point of the eleventh secondary winding and the twelfth secondary winding are connected to each other to form a second winding connection point; The output end of the first rectifier output unit, the output end of the third rectifier output unit and the output end of the fifth rectifier output unit are connected to each other to form a first rectifier output end; the output end of the second rectifier output unit, the output end of the fourth rectifier output unit and the output end of the sixth rectifier output unit are connected to each other to form a second rectifier output end.

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

7. The LLC circuit with wide output voltage and current sharing according to claim 5, characterized in that: The first transformer module, the second transformer module and the third transformer module respectively include N transformer units; the like-name ends of the first primary windings of the first to Nth transformer units are connected to each other, the opposite-name ends of the first primary windings are connected to each other, the like-name ends of the second primary windings are connected to each other, and the opposite-name ends of the second primary windings are connected to each other, where N is equal to 2.

8. The LLC circuit with wide output voltage and current sharing 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 resonance module includes a first LC resonance unit, a second LC resonance unit and a third LC resonance 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 the first power input end, the first input end of the first inverter unit, the first input end of the second inverter unit, and the first input end of the third inverter unit; the second end of the input capacitor is connected to the second power input end, the second input end of the first inverter unit, the second input end of the second inverter unit, and the second input end of the third inverter unit; The output end of the first inverter unit is connected to the first transformer module via the first LC resonance unit, the output end of the second inverter unit is connected to the second transformer module via the second LC resonance unit, and the output end of the third inverter unit is connected to the third transformer module via the third LC resonance unit.

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