Resonant conversion device

Abstract

A resonant conversion device comprises a first transformer, a second transformer, a first resonant controller, a second resonant controller, a first capacitor, a second capacitor, a control driver and a processor. The processor is coupled to the first capacitor, the second capacitor and primary sides of the first transformer and the second transformer. The processor receives the three-phase voltage, the three-phase current, the total voltage of the first capacitor and the second capacitor and the input voltage so as to provide direct-current voltage to the first resonance controller and the second resonance controller, and therefore first resonance current and second resonance current are generated on the primary sides of the first transformer and the second transformer respectively. The processor adjusts a voltage difference between the first capacitor and the second capacitor according to the first resonance current and the second resonance current until the first resonance current is equal to the second resonance current.

Description

Technical Field

[0001] The present invention relates to a conversion device, and in particular to a resonance conversion device. Background Art

[0002] Resonant converters can use resonant cavity circuits to shape the waveform of the switching voltage and / or switching current to minimize switching losses and operate at high frequencies. Due to its high efficiency, simple structure achieved by integrated magnetic components, soft switching on the primary and secondary switches, and applicability to applications with a wide voltage range, it has been widely used as an isolated DC converter.

[0003] Since the inductor-inductor-capacitor (LLC) resonant converter has the advantages of low voltage stress of the main switching switch and can achieve zero-voltage switching (ZVS), two sets of inductor-inductor-capacitor (LLC) resonant tanks are used in the primary stack when designing high-power or high-voltage input application models, and the secondary is used in parallel. Because the parameters of the components mainly involved in the resonance must have manufacturing errors during the production process, the upper and lower sets of LLC resonant tanks produce a resonance point offset phenomenon, which leads to uneven currents in the two sets of parallel connections, and also reduces the utilization rate of each set of LLC resonant tanks, and the selection of parts needs to be considered one level more.

[0004] Therefore, the present invention aims at the above-mentioned problem and proposes a resonance conversion device to solve the problems generated by the prior art. Summary of the invention

[0005] The present invention provides a resonant conversion device, which realizes the equalization of the resonant current of the upper and lower groups on the high-voltage primary side and the low-voltage secondary side, thereby improving the reliability and utilization rate of the circuit.

[0006] In one embodiment of the present invention, a resonant conversion device includes a first transformer, a second transformer, a first resonant controller, a second resonant controller, a first capacitor, a second capacitor, a control driver and a processor. The secondary sides of the first transformer and the second transformer are coupled to each other and used to generate an output voltage. The first resonant controller and the second resonant controller are respectively coupled to the primary sides of the first transformer and the second transformer and are stacked with each other. The first capacitor and the second capacitor are respectively coupled to the first resonant controller and the second resonant controller and are coupled in series with each other. The control driver is coupled to the first resonant controller and the second resonant controller and is used to drive the first resonant controller and the second resonant controller. The processor is coupled to the first capacitor, the second capacitor and the primary sides of the first transformer and the second transformer. The processor is used to receive a three-phase voltage, a three-phase current corresponding to the three-phase voltage, a total voltage on the first capacitor and the second capacitor and an input voltage corresponding to the output voltage, so as to provide a DC voltage to the first resonant controller and the second resonant controller, thereby generating a first resonant current and a second resonant current on the primary sides of the first transformer and the second transformer, respectively. The processor is used for receiving the first resonant current and the second resonant current, and adjusting the voltage difference between the first capacitor and the second capacitor accordingly until the first resonant current is equal to the second resonant current.

[0007] In one embodiment of the present invention, the processor includes a compensation control circuit, a pulse width modulation signal generator and a three-phase power factor corrector. The compensation control circuit is coupled to the first capacitor, the second capacitor and the primary side of the first transformer and the second transformer. The compensation control circuit is used to receive the three-phase voltage, the three-phase current, the total voltage and the input voltage, and generate a three-phase AC compensation voltage signal accordingly. The pulse width modulation signal generator is coupled to the compensation control circuit. The pulse width modulation signal generator is used to receive the three-phase AC compensation voltage signal and the triangular wave signal to thereby generate a three-phase pulse width modulation signal. The three-phase power factor corrector is coupled to the pulse width modulation signal generator, the first capacitor and the second capacitor. The three-phase power factor corrector is used to receive the three-phase voltage and the three-phase pulse width modulation signal, and provide a DC voltage according to the three-phase voltage, and drive the first resonant controller and the second resonant controller to generate a first resonant current and a second resonant current. The three-phase power factor corrector is used to adjust the voltage difference according to the three-phase voltage and the three-phase pulse width modulation signal.

[0008] In one embodiment of the present invention, the compensation control circuit includes a first subtractor, a proportional amplifier, a second subtractor, a three-phase voltage compensation circuit and an adder. The first subtractor is coupled to the primary side of the first transformer and the second transformer. The first subtractor is used to receive the first resonant current and the second resonant current, and subtract them to obtain a difference current. The proportional amplifier is coupled to the first subtractor, wherein the proportional amplifier is used to receive the difference current and generate a compensation voltage accordingly. The second subtractor is coupled to the first capacitor and the second capacitor. The second subtractor is used to receive the input voltage and the total voltage, and subtract them to generate a set voltage. The three-phase voltage compensation circuit is coupled to the second subtractor. The three-phase voltage compensation circuit is used to receive the set voltage, the three-phase voltage and the three-phase current, and generate a three-phase AC voltage signal accordingly. The adder is coupled to the pulse width modulation signal generator, the three-phase voltage compensation circuit and the proportional amplifier. The adder is used to receive the three-phase AC voltage signal, and add the three-phase AC voltage signal and the compensation voltage to generate a three-phase AC compensation voltage signal.

[0009] In one embodiment of the present invention, the three-phase voltage compensation circuit includes a voltage-to-current converter, three first multipliers, three second multipliers, three third subtractors, and a current-to-voltage converter. The voltage-to-current converter is coupled to the second subtractors, all the first multipliers are coupled to the voltage-to-current converter, all the second multipliers are respectively coupled to all the first multipliers, all the third subtractors are respectively coupled to all the second multipliers, and the current-to-voltage converter is coupled to all the third subtractors and the adder.

[0010] In one embodiment of the present invention, the first resonant controller includes a first electronic switch, a second electronic switch and a first resonant tank. The first electronic switch and the second electronic switch are coupled in series between two ends of the first capacitor, and the first resonant tank is coupled between two ends of the first capacitor, a node between the first electronic switch and the second electronic switch, and a primary side of the first transformer.

[0011] In one embodiment of the present invention, the first resonant tank includes a third capacitor, a fourth capacitor and a first inductor. The third capacitor and the fourth capacitor are coupled in series between two ends of the first capacitor. One end of the first inductor is coupled to a node between the first electronic switch and the second electronic switch, and the other end is coupled to one end of the primary side of the first transformer, and the other end of the primary side of the first transformer is coupled to a node between the third capacitor and the fourth capacitor.

[0012] In one embodiment of the present invention, the second resonant controller includes a third electronic switch, a fourth electronic switch and a second resonant tank. The third electronic switch and the fourth electronic switch are coupled in series between the two ends of the second capacitor, and the second resonant tank is coupled between the two ends of the second capacitor, the node between the third electronic switch and the fourth electronic switch and the primary side of the second transformer.

[0013] In one embodiment of the present invention, the second resonant tank includes a fifth capacitor, a sixth capacitor and a second inductor. The fifth capacitor and the sixth capacitor are coupled in series between the two ends of the second capacitor. One end of the second inductor is coupled to a node between the third electronic switch and the fourth electronic switch, and the other end is coupled to one end of the primary side of the second transformer, and the other end of the primary side of the second transformer is coupled to a node between the fifth capacitor and the sixth capacitor.

[0014] In one embodiment of the present invention, the resonant conversion device further includes a first synchronous rectification switch, a second synchronous rectification switch, a third synchronous rectification switch and a fourth synchronous rectification switch. The first synchronous rectification switch and the second synchronous rectification switch are respectively coupled to the two ends of the secondary side of the first transformer, and are coupled between the secondary side of the first transformer and a first output terminal. The third synchronous rectification switch and the fourth synchronous rectification switch are respectively coupled to the two ends of the secondary side of the second transformer, and are coupled between the secondary side of the second transformer and the first output terminal. The center taps of the first transformer and the second transformer are coupled to each other and coupled to a second output terminal.

[0015] In one embodiment of the present invention, the first synchronous rectification switch, the second synchronous rectification switch, the third synchronous rectification switch and the fourth synchronous rectification switch are metal oxide semiconductor field effect transistors.

[0016] Based on the above, the resonant conversion device detects the resonant current on the high-voltage primary side to appropriately adjust the voltage of the capacitor at the output end of the processor to achieve current equalization of the upper and lower groups of resonant currents on the high-voltage primary side and the low-voltage secondary side, thereby improving the reliability and utilization of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 4 is a circuit diagram of a resonant conversion device according to an embodiment of the present invention.

[0018] Figure 2 FIG. 4 is a circuit diagram of a processor according to an embodiment of the present invention.

[0019] Figure 3 FIG. 4 is a waveform diagram of voltage and current of a resonant converter according to an embodiment of the present invention.

[0020] Explanation of the reference numerals: 1-resonance conversion device; 10-first transformer; 11-second transformer; 12-first resonant controller; 120-first electronic switch; 121-second electronic switch; 122-first resonant tank; 1220-third capacitor; 1221-fourth capacitor; 1222-first inductor; 13-second resonant controller; 130-third electronic switch; 131-fourth electronic switch; 132-second resonant tank; 1320-fifth capacitor; 1321-sixth capacitor; 1322-second inductor; 14-first capacitor; 15-second capacitor; 16-control driver; 17-processor; 170-compensation control circuit; 1700-first subtractor; 1701-proportional amplifier; 1702-second subtractor; 1703-three-phase voltage compensation circuit; 17030-voltage to current converter; 17031-second A multiplier; 17032-a second multiplier; 17033-a third subtractor; 17034-a current-to-voltage converter; 1704-an adder; 171-a pulse width modulation signal generator; 172-a three-phase power factor corrector; S1-a first synchronous rectifier switch; S2-a second synchronous rectifier switch; S3-a third synchronous rectifier switch; S4-a fourth synchronous rectifier switch; Vo-an output voltage; VR, VS, VT-a three-phase voltage; IR, IS, IT-a three-phase current; Vt-a total voltage; Vi-an input voltage; VD-a DC voltage; I1-a first resonant current; I2-a second resonant current; AR, AS, AT-a three-phase AC compensation voltage signal; T-a triangle wave signal; PR, PS, PT-a three-phase pulse width modulation signal; ID-a difference current; VC-a compensation voltage; Vs-a set voltage; Ar, As, At-a three-phase AC voltage signal. DETAILED DESCRIPTION

[0021] The embodiments of the present invention will be further explained below with reference to the relevant drawings. As much as possible, the same reference numerals represent the same or similar components in the drawings and the specification. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It is understood that components not specifically shown in the drawings or described in the specification are in the form known to those skilled in the art. Those skilled in the art may make various changes and modifications based on the contents of the present invention.

[0022] Unless otherwise specified, some conditional sentences or words, such as "can", "could", "might", or "may", are generally intended to express that the present embodiment has, but can also be interpreted as features, components, or steps that may not be required. In other embodiments, these features, components, or steps may not be required.

[0023] The description of "one embodiment" or "an embodiment" in the following text refers to a specific component, structure or feature associated with at least one embodiment. Therefore, multiple descriptions of "one embodiment" or "an embodiment" appearing in multiple places in the following text do not refer to the same embodiment. Furthermore, specific components, structures and features in one or more embodiments can be combined in an appropriate manner.

[0024] Certain words are used in the specification and claims to refer to specific components. However, those with ordinary knowledge in the technical field should understand that the same component may be referred to by different terms. The specification and claims do not use differences in name as a way to distinguish components, but use differences in the functions of the components as a basis for distinction. The term "including" mentioned in the specification and claims is an open-ended term and should be interpreted as "including but not limited to". In addition, "coupling" includes any direct and indirect connection means. Therefore, if the text describes a first component coupled to a second component, it means that the first component can be directly connected to the second component through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or indirectly electrically or signal connected to the second component through other components or connection means.

[0025] The disclosure is particularly described with the following examples, which are only for illustration, because for those skilled in the art, various changes and modifications can be made without departing from the spirit and scope of the disclosure, so the protection scope of the disclosure should be determined by the scope of the attached claims. Throughout the specification and the claims, unless the content clearly specifies otherwise, the meaning of "a" and "the" includes such a description including "one or at least one" of the components or ingredients. In addition, as used in the disclosure, unless it is obvious from the specific context that the plurality is excluded, the singular article also includes the description of plural components or ingredients. Moreover, when used in this description and the following claims, unless the content clearly specifies otherwise, the meaning of "in which" may include "in which" and "on which". The terms used in the specification and the claims generally have the ordinary meaning of each term used in this field, in the content of this disclosure and in the specific content, unless otherwise specified. Certain terms used to describe the present disclosure will be discussed below or elsewhere in this specification to provide practitioners with additional guidance in describing the present disclosure. The use of examples anywhere throughout the specification, including examples of any term discussed herein, is merely illustrative and certainly does not limit the scope and meaning of the present disclosure or any exemplified term. Likewise, the present disclosure is not limited to the various embodiments set forth in this specification.

[0026] The following introduces a resonant conversion device, which detects the resonant current on the high-voltage primary side to appropriately adjust the voltage of the capacitor at the output end of the processor to achieve current balancing of the upper and lower groups of resonant currents on the high-voltage primary side and the low-voltage secondary side, thereby improving the reliability and utilization of the circuit.

[0027] Figure 1 is a circuit diagram of a resonant conversion device according to an embodiment of the present invention, Figure 2 FIG. 1 is a circuit diagram of a processor according to an embodiment of the present invention. Figure 1 and Figure 2 , an embodiment of the resonant conversion device 1 is introduced below. The resonant conversion device 1 includes a first transformer 10, a second transformer 11, a first resonant controller 12, a second resonant controller 13, a first capacitor 14, a second capacitor 15, a control driver 16 and a processor 17. The secondary sides of the first transformer 10 and the second transformer 11 are coupled to each other and used to generate an output voltage Vo. The primary sides of the first transformer 10 and the second transformer 11 are regarded as high-voltage sides, and the secondary sides are regarded as low-voltage sides. The first resonant controller 12 and the second resonant controller 13 are respectively coupled to the primary sides of the first transformer 10 and the second transformer 11, and are stacked with each other. The first resonant controller 12 is regarded as an upper half resonant controller, and the second resonant controller 13 is regarded as a lower half resonant controller. The first capacitor 14 and the second capacitor 15 are respectively coupled to the first resonant controller 12 and the second resonant controller 13, and are coupled in series with each other. The control driver 16 is coupled to the first resonant controller 12 and the second resonant controller 13, and is used to drive the first resonant controller 12 and the second resonant controller 13. The processor 17 is coupled to the first capacitor 14 , the second capacitor 15 , and the primary sides of the first transformer 10 and the second transformer 11 .

[0028] The processor 17 receives the three-phase voltages VR, VS, VT, the three-phase currents IR, IS, IT corresponding to the three-phase voltages VR, VS, VT, the total voltage Vt on the first capacitor 14 and the second capacitor 15, and an input voltage Vi corresponding to the output voltage Vo, so as to provide a DC voltage VD to the first resonant controller 12 and the second resonant controller 13, so as to generate a first resonant current I1 and a second resonant current I2 on the primary side of the first transformer 10 and the second transformer 11, respectively. The processor 17 receives the first resonant current I1 and the second resonant current I2, and adjusts the voltage difference between the first capacitor 14 and the second capacitor 15 accordingly until the first resonant current I1 is equal to the second resonant current I2, so as to improve the reliability and utilization of the circuit. In fact, the total voltage Vt on the first capacitor 14 and the second capacitor 15 is zero voltage at the beginning. After the first resonant current I1 and the second resonant current I2 are generated, the total voltage Vt on the first capacitor 14 and the second capacitor 15 is equal to the DC voltage VD. Meanwhile, the voltage of the node between the first capacitor 14 and the second capacitor 15 is smaller than the voltage of the other node of the first capacitor 14 , and larger than the voltage of the other node of the second capacitor 15 .

[0029] In some embodiments of the present invention, the processor 17 may include a compensation control circuit 170, a pulse width modulation signal generator 171 and a three-phase power factor corrector 172. The compensation control circuit 170 is coupled to the first capacitor 14, the second capacitor 15 and the primary side of the first transformer 10 and the second transformer 11. The pulse width modulation signal generator 171 is coupled to the compensation control circuit 170, and the three-phase power factor corrector 172 is coupled to the pulse width modulation signal generator 171, the first capacitor 14 and the second capacitor 15. The compensation control circuit 170 receives the three-phase voltages VR, VS, VT, the three-phase currents IR, IS, IT, the total voltage Vt and the input voltage Vi, and generates the three-phase AC compensation voltage signals AR, AS, AT accordingly. The pulse width modulation signal generator 171 receives the three-phase AC compensation voltage signals AR, AS, AT and the triangular wave signal T to generate the three-phase pulse width modulation signals PR, PS, PT. The three-phase power factor corrector 172 receives the three-phase voltages VR, VS, VT and the three-phase pulse width modulation signals PR, PS, PT, and provides a DC voltage VD according to the three-phase voltages VR, VS, VT, and drives the first resonant controller 12 and the second resonant controller 13 to generate the first resonant current I1 and the second resonant current I2. The three-phase power factor corrector 172 adjusts the voltage difference between the first capacitor 14 and the second capacitor 15 according to the three-phase voltages VR, VS, VT and the three-phase pulse width modulation signals PR, PS, PT until the first resonant current I1 is equal to the second resonant current I2.

[0030] In some embodiments of the present invention, the compensation control circuit 170 may include a first subtractor 1700, a proportional amplifier 1701, a second subtractor 1702, a three-phase voltage compensation circuit 1703 and an adder 1704. The first subtractor 1700 is coupled to the primary side of the first transformer 10 and the second transformer 11, the proportional amplifier 1701 is coupled to the first subtractor 1700, and the second subtractor 1702 is coupled to the first capacitor 14 and the second capacitor 15. The three-phase voltage compensation circuit 1703 is coupled to the second subtractor 1702, and the adder 1704 is coupled to the pulse width modulation signal generator 171, the three-phase voltage compensation circuit 1703 and the proportional amplifier 1701. The first subtractor 1700 receives the first resonant current I1 and the second resonant current I2, and subtracts them to obtain a difference current ID. The proportional amplifier 1701 receives the difference current ID and generates a compensation voltage VC accordingly. The second subtractor 1702 receives the input voltage Vi and the total voltage Vt, and subtracts them to generate a set voltage Vs. The three-phase voltage compensation circuit 1703 receives the set voltage Vs, the three-phase voltages VR, VS, VT and the three-phase currents IR, IS, IT, and generates three-phase AC voltage signals Ar, As, At accordingly. The adder 1704 receives the three-phase AC voltage signals Ar, As, At, and adds the three-phase AC voltage signals Ar, As, At and the compensation voltage VC to generate three-phase AC compensation voltage signals AR, AS, AT.

[0031] The three-phase voltage compensation circuit 1703 may include a voltage-to-current converter 17030, three first multipliers 17031, three second multipliers 17032, three third subtractors 17033, and a current-to-voltage converter 17034. The voltage-to-current converter 17030 is coupled to the second subtractor 1702, all the first multipliers 17031 are coupled to the voltage-to-current converter 17030, all the second multipliers 17032 are respectively coupled to all the first multipliers 17031, all the third subtractors 17033 are respectively coupled to all the second multipliers 17032, and the current-to-voltage converter 17034 is coupled to all the third subtractors 17033 and the adder 1704. The voltage-to-current converter 17030 receives the set voltage Vs. The first multiplier 17031 receives the three-phase voltages VR, VS, and VT respectively, and the three-phase voltages VR, VS, and VT include the first phase voltage VR, the second phase voltage VS, and the third phase voltage VT. The second multiplier 17032 receives the physical quantities 1 / VRrms, 1 / VSrms, and 1 / VTrms, respectively, where VRrms is the root mean square value of the first phase voltage VR, VSrms is the root mean square value of the second phase voltage VS, and VTrms is the root mean square value of the third phase voltage VT. The third subtractor 17033 receives the three-phase currents IR, IS, and IT, respectively. All components in the three-phase voltage compensation circuit 1703 perform corresponding operations on the received physical quantities, so that the current-to-voltage converter 17034 generates three-phase AC voltage signals Ar, As, and At.

[0032] In some embodiments of the present invention, the first resonant controller 12 may include a first electronic switch 120, a second electronic switch 121, and a first resonant tank 122. The second resonant controller 13 may include a third electronic switch 130, a fourth electronic switch 131, and a second resonant tank 132. The first electronic switch 120, the second electronic switch 121, the third electronic switch 130, and the fourth electronic switch 131 may be, but not limited to, metal oxide semiconductor field effect transistors. The first electronic switch 120 and the second electronic switch 121 are coupled in series between the two ends of the first capacitor 14, and the first resonant tank 122 couples the two ends of the first capacitor 14, the node between the first electronic switch 120 and the second electronic switch 121, and the primary side of the first transformer 10. The third electronic switch 130 and the fourth electronic switch 131 are coupled in series between the two ends of the second capacitor 15, and the second resonant tank 132 couples the two ends of the second capacitor 15, the node between the third electronic switch 130 and the fourth electronic switch 131, and the primary side of the second transformer 11.

[0033] Specifically, the first resonant tank 122 may include a third capacitor 1220, a fourth capacitor 1221, and a first inductor 1222. The third capacitor 1220 and the fourth capacitor 1221 are coupled in series between the two ends of the first capacitor 14. One end of the first inductor 1222 is coupled to a node between the first electronic switch 120 and the second electronic switch 121, and the other end is coupled to one end of the primary side of the first transformer 10, and the other end of the primary side of the first transformer 10 is coupled to a node between the third capacitor 1220 and the fourth capacitor 1221. The second resonant tank 132 may include a fifth capacitor 1320, a sixth capacitor 1321, and a second inductor 1322. The fifth capacitor 1320 and the sixth capacitor 1321 are coupled in series between the two ends of the second capacitor 15. One end of the second inductor 1322 is coupled to the node between the third electronic switch 130 and the fourth electronic switch 131 , and the other end is coupled to one end of the primary side of the second transformer 11 . The other end of the primary side of the second transformer 11 is coupled to the node between the fifth capacitor 1320 and the sixth capacitor 1321 .

[0034] In order to achieve high-efficiency energy conversion, the resonant conversion device 1 may also include a first synchronous rectification switch S1, a second synchronous rectification switch S2, a third synchronous rectification switch S3 and a fourth synchronous rectification switch S4. The first synchronous rectification switch S1, the second synchronous rectification switch S2, the third synchronous rectification switch S3 and the fourth synchronous rectification switch S4 may be, but are not limited to, metal oxide semiconductor field effect transistors. The first synchronous rectification switch S1 and the second synchronous rectification switch S2 are respectively coupled to the two ends of the secondary side of the first transformer 10, and are coupled between the secondary side of the first transformer 10 and a first output terminal as a negative input terminal. The third synchronous rectification switch S3 and the fourth synchronous rectification switch S4 are respectively coupled to the two ends of the secondary side of the second transformer 11, and are coupled between the secondary side of the second transformer 11 and the first output terminal. The center taps of the first transformer 10 and the second transformer 11 are coupled to each other, and are coupled to a second output terminal as a positive input terminal.

[0035] Figure 3 is a waveform diagram of voltage and current of a resonant conversion device according to an embodiment of the present invention. Figure 3 and Figure 1 , where the DC link voltage of the upper semi-resonant controller is approximately 440 volts, and the DC link voltage of the lower semi-resonant controller is approximately 420 volts. Figure 3 The blue color in the upper figure represents the gate-source voltage of the first electronic switch 120 and the third electronic switch 130 , and the yellow color represents the gate-source voltage of the second electronic switch 121 and the fourth electronic switch 131 . Figure 3 The blue color in the middle figure represents the first resonant current I1, and the yellow color represents the second resonant current I2. Figure 3The blue color in the figure below represents the current through the first electronic switch 120 or the third electronic switch 130, the red color represents the current through the first synchronous rectifier switch S1 or the third synchronous rectifier switch S3, the yellow color represents the current through the second electronic switch 121 or the fourth electronic switch 131, and the green color represents the current through the second synchronous rectifier switch S2 or the fourth synchronous rectifier switch S4. Figure 3 It can be seen that the resonant currents of the upper and lower semi-resonant controllers are almost the same.

[0036] According to the above embodiment, the resonant conversion device detects the resonant current on the high-voltage primary side to appropriately adjust the voltage of the capacitor at the output end of the processor to achieve current balancing of the upper and lower groups of resonant currents on the high-voltage primary side and the low-voltage secondary side, thereby improving the reliability and utilization of the circuit.

[0037] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, all equivalent changes and modifications to the shape, structure, characteristics and spirit described in the scope of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A resonant conversion device, characterized in that: include: A first transformer and a second transformer, the secondary sides of which are coupled to each other and used to generate an output voltage; A first resonant controller and a second resonant controller are respectively coupled to the primary side of the first transformer and the second transformer and are stacked with each other; A first capacitor and a second capacitor are respectively coupled to the first resonant controller and the second resonant controller, and are coupled to each other in series; a control driver coupled to the first resonant controller and the second resonant controller and used to drive the first resonant controller and the second resonant controller; as well as A processor is coupled to the first capacitor, the second capacitor, and the primary sides of the first transformer and the second transformer, wherein the processor is used to receive a three-phase voltage, a three-phase current corresponding to the three-phase voltage, a total voltage on the first capacitor and the second capacitor, and an input voltage corresponding to the output voltage, so as to provide a DC voltage to the first resonant controller and the second resonant controller, thereby generating a first resonant current and a second resonant current on the primary sides of the first transformer and the second transformer, respectively. The processor is used to receive the first resonant current and the second resonant current, and adjust the voltage difference between the first capacitor and the second capacitor accordingly until the first resonant current is equal to the second resonant current.

2. The resonant conversion device according to claim 1, characterized in that: The processor comprises: a compensation control circuit coupled to the first capacitor, the second capacitor, and the primary sides of the first transformer and the second transformer, wherein the compensation control circuit is used to receive the three-phase voltage, the three-phase current, the total voltage, and the input voltage, and generate a three-phase AC compensation voltage signal accordingly; a pulse width modulation signal generator coupled to the compensation control circuit, wherein the pulse width modulation signal generator is used to receive the three-phase AC compensation voltage signal and the triangular wave signal to generate a three-phase pulse width modulation signal; and A three-phase power factor corrector is coupled to the pulse width modulation signal generator, the first capacitor and the second capacitor, wherein the three-phase power factor corrector is used to receive the three-phase voltage and the three-phase pulse width modulation signal, and provide the DC voltage according to the three-phase voltage, and drive the first resonant controller and the second resonant controller to generate the first resonant current and the second resonant current, and the three-phase power factor corrector is used to adjust the voltage difference according to the three-phase voltage and the three-phase pulse width modulation signal.

3. The resonant conversion device according to claim 2, characterized in that: The compensation control circuit comprises: a first subtractor coupled to the primary sides of the first transformer and the second transformer, wherein the first subtractor is used to receive the first resonant current and the second resonant current and subtract them to obtain a difference current; a proportional amplifier coupled to the first subtractor, wherein the proportional amplifier is used to receive the difference current and generate a compensation voltage accordingly; a second subtractor coupled to the first capacitor and the second capacitor, wherein the second subtractor is used for receiving the input voltage and the total voltage and subtracting them to generate a set voltage; a three-phase voltage compensation circuit coupled to the second subtractor, wherein the three-phase voltage compensation circuit is used to receive the set voltage, the three-phase voltage and the three-phase current, and generate a three-phase AC voltage signal accordingly; and An adder is coupled to the pulse width modulation signal generator, the three-phase voltage compensation circuit and the proportional amplifier, wherein the adder is used to receive the three-phase AC voltage signal and add the three-phase AC voltage signal and the compensation voltage to generate the three-phase AC compensation voltage signal.

4. The resonant conversion device according to claim 3, characterized in that: The three-phase voltage compensation circuit comprises: a voltage-to-current converter, coupled to the second subtractor; three first multipliers coupled to the voltage-to-current converter; three second multipliers, respectively coupled to the three first multipliers; three third subtractors, respectively coupled to the three second multipliers; and A current-to-voltage converter is coupled to the three third subtractors and the adder.

5. The resonant conversion device according to claim 1, characterized in that: The first resonant controller comprises: A first electronic switch and a second electronic switch are coupled in series between two ends of the first capacitor; and A first resonant tank is coupled to the two ends of the first capacitor, a node between the first electronic switch and the second electronic switch, and the primary side of the first transformer.

6. The resonant conversion device according to claim 5, characterized in that: The first resonant tank comprises: a third capacitor and a fourth capacitor, coupled in series between the two ends of the first capacitor; and A first inductor has one end coupled to the node between the first electronic switch and the second electronic switch, and the other end coupled to one end of the primary side of the first transformer, and the other end of the primary side of the first transformer is coupled to the node between the third capacitor and the fourth capacitor.

7. The resonant conversion device according to claim 6, characterized in that: The second resonant controller comprises: a third electronic switch and a fourth electronic switch, coupled in series between two ends of the second capacitor; and A second resonant tank is coupled to the two ends of the second capacitor, a node between the third electronic switch and the fourth electronic switch, and the primary side of the second transformer.

8. The resonant conversion device according to claim 7, characterized in that: The second resonant tank comprises: a fifth capacitor and a sixth capacitor, coupled in series between the two ends of the second capacitor; and a second inductor having one end coupled to the node between the third electronic switch and the fourth electronic switch and the other end coupled to one end of the primary side of the second transformer, the other end of the primary side of the second transformer being coupled to the node between the fifth capacitor and the sixth capacitor.

9. The resonant conversion device according to claim 1, characterized in that: Also includes: a first synchronous rectification switch and a second synchronous rectification switch, respectively coupled to two ends of the secondary side of the first transformer, and coupled between the secondary side of the first transformer and a first output terminal; as well as A third synchronous rectification switch and a fourth synchronous rectification switch are respectively coupled to the two ends of the secondary side of the second transformer and are coupled between the secondary side of the second transformer and the first output end, wherein the center taps of the first transformer and the second transformer are coupled to each other and coupled to a second output end.

10. The resonant conversion device according to claim 9, characterized in that: The first synchronous rectification switch, the second synchronous rectification switch, the third synchronous rectification switch and the fourth synchronous rectification switch are metal oxide semiconductor field effect transistors.

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