Bidirectional voltage conversion circuit and electronic device

Abstract

The present application provides a bidirectional voltage conversion circuit and electronic device, the bidirectional voltage conversion circuit including: a first interface unit, a buck-boost unit, a T-type conversion unit, a first conversion unit, a transformer unit, a second conversion unit, a second interface unit and a control unit, the control unit being used to: during charging, control the T-type conversion unit to output four groups of first DC voltages with equal phase differences of 90° to the first conversion unit, the primary side of the first conversion unit and the transformer unit forming a first resonance unit, and controlling the resonance frequency of the first resonance unit to be the same as the switching frequency of the second conversion unit; during discharging, the secondary side of the second conversion unit and the transformer unit forming a second resonance unit, controlling the resonance frequency of the second resonance unit to be the same as the switching frequency of the first conversion unit, and controlling the T-type conversion unit to output two groups of power supply AC voltages, and controlling the phase of the power supply AC voltage to output multiple output AC voltages at the first interface unit.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy conversion, and in particular to a bidirectional voltage conversion circuit and electronic equipment. Background Art

[0002] With the rapid development of industrialization, global energy consumption is increasing, leading to ever-increasing demands for improved product efficiency, reliability, energy conservation, and environmental protection. Therefore, a bidirectional converter circuit with a wide input and output voltage range, low ripple current, high efficiency, high reliability, and excellent value for money has been developed. This circuit can both charge and discharge batteries used in charging piles, electric vehicle batteries, industrial power supply batteries, UPS (uninterruptible power supplies), MPPT (solar photovoltaic) batteries, and energy storage products. This versatile bidirectional converter circuit can convert AC to DC and DC to AC. Existing open-circuit power converter circuits cannot simultaneously output multiple voltage amplitudes during reverse discharge, or inversion. Summary of the Invention

[0003] The present application provides a bidirectional voltage conversion circuit and an electronic device for realizing bidirectional input and output of voltages of various amplitudes.

[0004] In a first aspect, an embodiment of the present application provides a bidirectional voltage conversion circuit, wherein a first end of the bidirectional voltage conversion circuit is used to connect to a power supply device or a power consumption device, and a second end of the bidirectional voltage conversion circuit is used to connect to an energy storage device, including:

[0005] a first interface unit, wherein a first end of the first interface unit is used to connect to the power supply device or the power consumption device;

[0006] a buck-boost unit, wherein a first end of the buck-boost unit is connected to the second end of the first interface unit;

[0007] A T-type conversion unit, wherein a first end of the T-type conversion unit is connected to a second end of the buck-boost unit;

[0008] a first conversion unit, wherein a first end of the first conversion unit is connected to a second end of the T-type conversion unit;

[0009] a voltage transformation unit, wherein a first end of the unit is connected to a second end of the first conversion unit;

[0010] a second conversion unit, wherein a first end of the second conversion unit is connected to a second end of the voltage transformation unit;

[0011] a second interface unit, wherein a first end of the second interface unit is connected to a second end of the second conversion unit, and the second end of the second interface unit is used to connect to the energy storage device;

[0012] A control unit, the control unit is used to: during the process of charging the energy storage device, control the T-type conversion unit to output four groups of first DC voltages with equal phase intervals of 90° to the first conversion unit, the first conversion unit and the primary side of the transformer unit constitute a first resonance unit, and control the resonance frequency of the first resonance unit to be the same as the switching frequency of the second conversion unit; the control unit is also used to, during the process of powering the electrical equipment, control the second conversion unit and the secondary side of the transformer unit to constitute a second resonance unit, control the resonance frequency of the second resonance unit to be the same as the switching frequency of the first conversion unit, and control the T-type conversion unit to output two groups of power supply AC voltages, and control the phase of the power supply AC voltage to output multiple output AC voltages at the first interface unit.

[0013] In some embodiments, the first interface unit includes: a first interface component, a second interface component, a third interface component, a fourth interface component, a fifth interface component, a sixth interface component, a first switch component, a second switch component, a third switch component, and a fourth switch component;

[0014] The first end of the first interface component is connected to the first switch component, the second end of the first interface component is connected to the first reference end of the T-type conversion unit, the first end of the fifth interface component is connected to the first switch component, and the first switch component is connected to the first first end of the buck-boost unit;

[0015] The first end of the second interface component is connected to the second switch component, the second end of the second interface component is connected to the second reference end of the T-type conversion unit, the second end of the fifth interface component is connected to the second switch component, and the second switch component is connected to the second first end of the buck-boost unit;

[0016] The first end of the third interface component is connected to the third switch component, the second end of the third interface component is connected to the third reference end of the T-type conversion unit, the first end of the sixth interface component is connected to the third switch component, and the third switch component is connected to the third first end of the buck-boost unit;

[0017] The first end of the fourth interface component is connected to the second switch component, the second end of the fourth interface component is connected to the fourth reference end of the T-type conversion unit, the second end of the sixth interface component is connected to the fourth switch component, and the fourth switch component is connected to the fourth first end of the buck-boost unit.

[0018] In some embodiments, the buck-boost unit includes: a first inductor, a second inductor, a third inductor, and a fourth inductor;

[0019] The first end of the first inductor is the first first end of the buck-boost unit, the first end of the first inductor is connected to the first switch, and the second end of the first inductor is connected to the first first end of the T-type conversion unit;

[0020] The first end of the second inductor is the second first end of the buck-boost unit, the first end of the second inductor is connected to the second switch element, and the second end of the second inductor is connected to the second first end of the T-type conversion unit;

[0021] The first end of the third inductor is the third first end of the buck-boost unit, the first end of the third inductor is connected to the third switch element, and the second end of the third inductor is connected to the third first end of the T-type conversion unit;

[0022] The first end of the fourth inductor is the fourth first end of the buck-boost unit, the first end of the fourth inductor is connected to the fourth switch element, and the second end of the fourth inductor is connected to the fourth first end of the T-type conversion unit.

[0023] In some embodiments, the T-type conversion unit includes: a first T-type topology group, a second T-type topology group, a third T-type topology group, and a fourth T-type topology group;

[0024] The first end of the first T-type topology group is the first first end of the T-type conversion unit, the reference end of the first T-type topology group is the first reference end of the T-type conversion unit, and the first end of the first T-type topology group is connected to the first inductor;

[0025] The first end of the second T-type topology group is the second first end of the T-type conversion unit, the reference end of the second T-type topology group is the second reference end of the T-type conversion unit, and the first end of the second T-type topology group is connected to the second inductor;

[0026] The first end of the third T-type topology group is the third first end of the T-type conversion unit, the reference end of the third T-type topology group is the third reference end of the T-type conversion unit, and the first end of the third T-type topology group is connected to the third inductor;

[0027] The first end of the fourth T-type topology group is the fourth first end of the T-type conversion unit, the reference end of the fourth T-type topology group is the fourth reference end of the T-type conversion unit, and the first end of the fourth T-type topology group is connected to the fourth inductor.

[0028] Among them, the second end of the first T-type topology group, the second end of the second T-type topology group, the second end of the third T-type topology group and the second end of the fourth T-type topology group are connected, the third end of the first T-type topology group, the third end of the second T-type topology group, the third end of the third T-type topology group and the third end of the fourth T-type topology group are connected; the reference end of the first T-type topology group, the reference end of the second T-type topology group, the reference end of the third T-type topology group and the reference end of the fourth T-type topology group are connected.

[0029] In some embodiments, the first conversion unit includes: a first bridge type group, a second bridge type group, a third bridge type group, and a fourth bridge type group;

[0030] The first input end of the first bridge group is connected to the second end of the first T-type topology group, and the second input end of the first bridge group is connected to the reference end of the first T-type topology group;

[0031] The first input end of the second bridge group is connected to the reference end of the first T-type topology group, and the second input end of the second bridge group is connected to the third end of the first T-type topology group;

[0032] The first input end of the third bridge group is connected to the second end of the first T-type topology group, and the second input end of the third bridge group is connected to the reference end of the first T-type topology group;

[0033] The first input end of the fourth bridge group is connected to the second end of the first T-type topology group, and the second input end of the fourth bridge group is connected to the reference end of the fourth T-type topology group.

[0034] In some embodiments, the transformer unit includes: a first transformer group, a second transformer group, a third transformer group, and a fourth transformer group;

[0035] The first transformer group includes: a first resonant capacitor, a first transformer and a fifth resonant capacitor;

[0036] The second transformer group includes: a second resonant capacitor, a second transformer and a sixth resonant capacitor;

[0037] The third transformer group includes: a third resonant capacitor, a third transformer and a seventh resonant capacitor;

[0038] The fourth transformer group includes: a fourth resonant capacitor, a fourth transformer and an eighth resonant capacitor.

[0039] In some embodiments, the second conversion unit includes: a fifth bridge type group, a sixth bridge type group, a seventh bridge type group, and an eighth bridge type group;

[0040] The first output end of the fifth bridge group is connected to the first output end of the sixth bridge group, and the second output end of the fifth bridge group and the second output end of the sixth bridge group are connected to the first ground end;

[0041] The first output end of the seventh bridge group is connected to the first output end of the eighth bridge group, and the second output end of the seventh bridge group and the second output end of the eighth bridge group are connected to the first ground end.

[0042] In some embodiments, the second interface unit includes: a fifth switch element, a sixth switch element, a seventh switch element, a first diode, a second diode, a first resistor, a second resistor, and a third resistor;

[0043] The first end of the fifth switch element is respectively connected to the first output end of the fifth bridge group and the anode of the first diode, and the second end of the fifth switch element is respectively connected to the cathode of the first diode, the first end of the first resistor, and the positive electrode of the energy storage device; the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the second ground terminal; the first end of the sixth switch element is respectively connected to the first output end of the seventh bridge group and the anode of the second diode, and the second end of the sixth switch element is respectively connected to the cathode of the second diode, the first end of the first resistor, and the positive electrode of the energy storage device.

[0044] In a second aspect, an embodiment of the present application provides an electronic device, which includes the bidirectional voltage conversion circuit as described in the embodiment of the present application.

[0045] An embodiment of the present application provides a bidirectional voltage conversion circuit, wherein the first end of the bidirectional voltage conversion circuit is used to connect to a power supply device or a power consumption device, and the second end of the bidirectional voltage conversion circuit is used to connect to an energy storage device. The bidirectional voltage conversion circuit includes: a first interface unit, a buck-boost unit, a T-type conversion unit, a first conversion unit, a transformer unit, a second conversion unit, and a second interface unit. The first end of the first interface unit is used to connect to a power supply device or a power consumption device; the first end of the buck-boost unit is connected to the second end of the first interface unit; the first end of the T-type conversion unit is connected to the second end of the buck-boost unit; the first conversion unit, the first end of the first conversion unit is connected to the second end of the T-type conversion unit; the first end of the unit is connected to the second end of the first conversion unit, the transformer unit; the first end of the second conversion unit is connected to the second end of the transformer unit; the second interface unit, the first end of the second interface unit is connected to the second end of the second conversion unit, and the second end of the second interface unit is used to connect to the energy storage device; a control unit, the control unit is used to: during the process of charging the energy storage device In the process, the T-type conversion unit is controlled to output four groups of first DC voltages with equal phase intervals of 90° to the first conversion unit. The primary side of the first conversion unit and the transformer unit constitute a first resonance unit, and the resonance frequency of the first resonance unit is controlled to be the same as the switching frequency of the second conversion unit. The control unit is also used to control the secondary side of the second conversion unit and the transformer unit to constitute a second resonance unit in the process of powering the electrical equipment, control the resonance frequency of the second resonance unit to be the same as the switching frequency of the first conversion unit, and control the T-type conversion unit to output two groups of power supply AC voltages and control the phase of the power supply AC voltage to output multiple output AC voltages at the first interface unit. The beneficial effects achieved by the above method include:

[0046] 1. Realize wide voltage input and wide voltage output at the same time.

[0047] 2. The control unit can be used to control the T-type conversion unit to achieve four-way first DC voltage (PFC) interleaving. Each first DC voltage is staggered by 90 degrees to reduce ripple, thereby reducing bus capacitance and step-up / step-down inductance, improving capacitor life and converter reliability, and reducing costs.

[0048] 3. The control unit can control the switching frequency of the first conversion unit or the second conversion unit to enable the resonant unit to achieve soft switching, so that the primary side is turned on with zero voltage and the secondary side is turned off with zero current, thereby greatly reducing the switching loss of the first conversion unit or the second conversion unit and improving efficiency, reducing the stress, temperature and electromagnetic radiation of the MOSFET device and improving product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A schematic block diagram of a bidirectional voltage conversion circuit provided in an embodiment of the present application;

[0051] Figure 2 A circuit diagram of a bidirectional voltage conversion circuit provided in an embodiment of the present application.

[0052] Description of reference numerals:

[0053] 200, power supply equipment; 300, power consumption equipment; 400, energy storage equipment; 100, bidirectional voltage conversion circuit; 11, first interface unit; 12, buck-boost unit; 13, T-type conversion unit; 131, first T-type topology group; 132, second T-type topology group; 133, third T-type topology group; 134, fourth T-type topology group; 14, first conversion unit; 141, first bridge group; 142, second bridge group; 143, third bridge group; 144, fourth bridge group; 15, transformer unit; 151, first transformer group; 152, second transformer group; 153, third transformer group; 154, fourth transformer group; 16, second conversion unit; 161, fifth bridge group; 162, sixth bridge group; 163, Seventh bridge group; 164, eighth bridge group; 17, second interface unit; AC1, first interface component; AC2, second interface component; AC3, third interface component; AC4, fourth interface component; AC5, fifth interface component; AC6, sixth interface component; K1, first switch component; K2, second switch component; K3, third switch component; K4, fourth switch component; K5, fifth switch component; K6, sixth switch component; K7, seventh switch component; L1, first inductor; L2, second inductor; L3, third inductor; L4, fourth inductor; Q1, first switch tube; Q2, second switch tube; Q3, third switch tube; Q4, fourth switch tube; Q5, fifth switch tube; Q6, sixth switch tube; Q7, seventh switch tube; Q8, eighth Switching tube; Q9, the ninth switching tube; Q10, the tenth switching tube; Q11, the eleventh switching tube; Q12, the twelfth switching tube; Q13, the thirteenth switching tube; Q14, the fourteenth switching tube; Q15, the fifteenth switching tube; Q16, the sixteenth switching tube; Q17, the seventeenth switching tube; Q18, the eighteenth switching tube; Q19, the nineteenth switching tube; Q20, the twentieth switching tube; Q21, the twenty-first switching tube; Q22, the twenty-second switching tube; Q23, the twenty-third switching tube; Q24, the twenty-fourth switching tube; Q25, the twenty-fifth switching tube; Q26, the twenty-sixth switching tube; Q27, the twenty-seventh switching tube; Q28, the twenty-eighth switching tube; Q29, the twenty-ninth switching tube; Q30, the thirtieth switching tube Q31, the 31st switch; Q32, the 32nd switch; Q33, the 33rd switch; Q34, the 34th switch; Q35, the 35th switch; Q36, the 36th switch; Q37, the 37th switch; Q38, the 38th switch; Q39, the 39th switch; Q40, the 40th switch; Q41, the 41st switch; Q42, the 42nd switch; Q43, the 43rd switch; Q44, the 44th switch; Q45, the 45th switch; Q46, the 46th switch; Q47, the 47th switch; Q48, the 48th switch; C1, the first capacitor; C2, the second capacitor; C3, the third capacitor; C4, the fourth capacitor;C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; C8, eighth capacitor; C9, ninth capacitor; C10, tenth capacitor; C11, eleventh capacitor; C12, twelfth capacitor; R1, first resistor; R2, second resistor; R3, third resistor; D1, first diode; D2, second diode; SGND1, first ground terminal; SGND2, second ground terminal; Lr1, first resonant inductor; Lr2, second resonant inductor; Lr3, third resonant inductor; Lr4, fourth resonant inductor; Cr1, first resonant capacitor; Cr2, second resonant capacitor; Cr3, third resonant capacitor; Cr4, fourth resonant capacitor; Cr5, fifth resonant capacitor; Cr6, sixth resonant capacitor; Cr7, seventh resonant capacitor; Cr8, eighth resonant capacitor. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0055] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, combined, or partially merged, so the actual execution order may vary depending on the actual situation.

[0056] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0057] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0058] An embodiment of the present application provides a bidirectional voltage conversion circuit. The first end of the bidirectional voltage conversion circuit is used to connect to a power supply device or a power consumption device, and the second end of the bidirectional voltage conversion circuit is used to connect to an energy storage device. The bidirectional voltage conversion circuit provided in the embodiment of the present application is used to charge the energy storage device from the power supply device, or to supply power to the power consumption device from the energy storage device.

[0059] See also Figure 1 , Figure 1 : is a schematic block diagram of a bidirectional voltage conversion circuit provided by an embodiment of the present application. Figure 1 As shown, the bidirectional voltage conversion circuit 100 includes: a first interface unit 11, a buck-boost unit 12, a T-type conversion unit 13, a first conversion unit 14, a transformer unit 15, a second conversion unit 16, a second interface unit 17, and a control unit. The first end of the first interface unit 11 is used to connect to the power supply device 200 or the power consumption device 300. The first end of the buck-boost unit 12 is connected to the second end of the first interface unit 11. The first end of the T-type conversion unit 13 is connected to the second end of the buck-boost unit 12. The first end of the first conversion unit 14 is connected to the second end of the T-type conversion unit 13. The first end of the unit is connected to the second end of the first conversion unit 14, and the transformer unit 15. The first end of the second conversion unit 16 is connected to the second end of the transformer unit 15. The second interface unit 17 is connected to the second end of the second conversion unit 16, and the second end of the second interface unit 17 is used to connect to the energy storage device 400. The control unit is configured to: during charging of the energy storage device 400, control the T-type conversion unit 13 to output four sets of first DC voltages with equidistant phases of 90° to the first conversion unit 14; the primary side of the first conversion unit 14 and the transformer unit 15 constitute a first resonant unit; and control the resonant frequency of the first resonant unit to be the same as the switching frequency of the second conversion unit 16. The control unit is also configured to: during powering of the electrical device 300, control the secondary side of the second conversion unit 16 and the transformer unit 15 to constitute a second resonant unit; control the resonant frequency of the second resonant unit to be the same as the switching frequency of the first conversion unit 14; control the T-type conversion unit 13 to output two sets of AC power supply voltages; and control the phases of the AC power supply voltages to output multiple output AC voltages to the first interface unit 11.

[0060] An embodiment of the present application provides a bidirectional voltage conversion circuit, wherein the first end of the bidirectional voltage conversion circuit is used to connect to a power supply device or a power consumption device, and the second end of the bidirectional voltage conversion circuit is used to connect to an energy storage device. The bidirectional voltage conversion circuit includes: a first interface unit, a buck-boost unit, a T-type conversion unit, a first conversion unit, a transformer unit, a second conversion unit, and a second interface unit. The first end of the first interface unit is used to connect to a power supply device or a power consumption device; the first end of the buck-boost unit is connected to the second end of the first interface unit; the first end of the T-type conversion unit is connected to the second end of the buck-boost unit; the first conversion unit, the first end of the first conversion unit is connected to the second end of the T-type conversion unit; the first end of the unit is connected to the second end of the first conversion unit, the transformer unit; the first end of the second conversion unit is connected to the second end of the transformer unit; the second interface unit, the first end of the second interface unit is connected to the second end of the second conversion unit, and the second end of the second interface unit is used to connect to the energy storage device; a control unit, the control unit is used to: during the process of charging the energy storage device In the process, the T-type conversion unit is controlled to output four groups of first DC voltages with equal phase intervals of 90° to the first conversion unit. The primary side of the first conversion unit and the transformer unit constitute a first resonance unit, and the resonance frequency of the first resonance unit is controlled to be the same as the switching frequency of the second conversion unit. The control unit is also used to control the secondary side of the second conversion unit and the transformer unit to constitute a second resonance unit in the process of powering the electrical equipment, control the resonance frequency of the second resonance unit to be the same as the switching frequency of the first conversion unit, and control the T-type conversion unit to output two groups of power supply AC voltages and control the phase of the power supply AC voltage to output multiple output AC voltages at the first interface unit. The beneficial effects achieved by the above method include:

[0061] 1. Realize wide voltage input and wide voltage output at the same time.

[0062] 2. The control unit can be used to control the T-type conversion unit to achieve four-way first DC voltage (PFC) interleaving. Each first DC voltage is staggered by 90 degrees to reduce ripple, thereby reducing bus capacitance and step-up / step-down inductance, improving capacitor life and converter reliability, and reducing costs.

[0063] 3. The control unit can control the switching frequency of the first conversion unit or the second conversion unit to enable the resonant unit to achieve soft switching, so that the primary side is turned on with zero voltage and the secondary side is turned off with zero current, thereby greatly reducing the switching loss of the first conversion unit or the second conversion unit and improving efficiency, reducing the stress, temperature and electromagnetic radiation of the MOSFET device and improving product reliability.

[0064] In order to more clearly introduce the technical solution of the present application, the technical solution of the present application will be introduced through specific embodiments below. It should be noted that the specific embodiments are used to expand the technical solution of the present application, but are not intended to limit the present application.

[0065] See also Figure 2 , Figure 2 An embodiment of the present application also provides a circuit schematic diagram of a bidirectional voltage conversion circuit.

[0066] In some embodiments, as Figure 2 The first interface unit 11 shown includes: a first interface component AC1, a second interface component AC2, a third interface component AC3, a fourth interface component AC4, a fifth interface component AC5, a sixth interface component AC6, a first switch component K1, a second switch component K2, a third switch component K3, and a fourth switch component K4.

[0067] The first end (L1) of the first interface component AC1 is connected to the first switch component K1, the first end (N1) of the first interface component AC1 is connected to the first reference end (BUS-M) of the T-type conversion unit 13, the first end (L1) of the fifth interface component AC5 is connected to the first switch component K1, and the first switch component K1 is connected to the first first end of the buck-boost unit 12.

[0068] The first end (L2) of the second interface component AC2 is connected to the second switch component K2, the second end (N2) of the second interface component AC2 is connected to the second reference end (BUS-M) of the T-type conversion unit 13, the second end (L2) of the fifth interface component AC5 is connected to the second switch component K2, and the second switch component K2 is connected to the second first end of the buck-boost unit 12.

[0069] The first end (L3) of the third interface component AC3 is connected to the third switch component K3, the second end (N3) of the third interface component AC3 is connected to the third reference end (BUS-M) of the T-type conversion unit 13, the first end (L3) of the sixth interface component AC6 is connected to the third switch component K3, and the third switch component K3 is connected to the third first end of the buck-boost unit 12.

[0070] The first end (L4) of the fourth interface component AC4 is connected to the second switch component K2, the second end (N4) of the fourth interface component AC4 is connected to the fourth reference end (BUS-M) of the T-type conversion unit 13, the second end (L4) of the sixth interface component AC6 is connected to the fourth switch component K4, and the fourth switch component K4 is connected to the fourth first end of the buck-boost unit 12.

[0071] In some embodiments, as Figure 2 The buck-boost unit 12 shown includes a first inductor L1 , a second inductor L2 , a third inductor L3 and a fourth inductor L4 .

[0072] The first end of the first inductor L1 is the first first end of the buck-boost unit 12 , is connected to the first switch K1 , and the second end of the first inductor L1 is connected to the first first end of the T-type conversion unit 13 .

[0073] The first end of the second inductor L2 is the second first end of the buck-boost unit 12 , is connected to the second switch K2 , and the second end of the second inductor L2 is connected to the second first end of the T-type conversion unit 13 .

[0074] The first end of the third inductor L3 is the third first end of the buck-boost unit 12 , is connected to the third switch K3 , and the second end of the third inductor L3 is connected to the third first end of the T-type conversion unit 13 .

[0075] The first end of the fourth inductor L4 is the fourth first end of the buck-boost unit 12 , the first end of the fourth inductor L4 is connected to the fourth switch K4 , and the second end of the fourth inductor L4 is connected to the fourth first end of the T-type conversion unit 13 .

[0076] In some embodiments, as Figure 2 The T-type conversion unit 13 shown includes a first T-type topology group 131 , a second T-type topology group 132 , a third T-type topology group 133 and a fourth T-type topology group 134 .

[0077] The first end of the first T-type topology group 131 is the first first end of the T-type conversion unit 13. The reference end (BUS-M) of the first T-type topology group 131 is the first reference end (BUS-M) of the T-type conversion unit 13. The first end of the first T-type topology group 131 is the first first end of the T-type conversion unit 13. The first end of the first T-type topology group 131 is connected to the first inductor L1.

[0078] The first T-type topology group 131 includes: a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a first capacitor C1 and a second capacitor C2, and the specific connection relationship is as follows: Figure 2 As shown. The controlled terminal of the third switch Q3 serves as the reference terminal (BUS-M) of the first T-type topology group 131. The first terminal of the first capacitor C1 serves as the second terminal (BUS+) of the first T-type topology group 131. The second terminal of the first capacitor C1 and the first terminal of the second capacitor serve as the reference terminal (BUS-M) of the first T-type topology group 131. The second terminal of the second capacitor serves as the third terminal (BUS-) of the first T-type topology group 131.

[0079] The first end of the second T-type topology group 132 is the second first end of the T-type conversion unit 13. The reference end (BUS-M) of the second T-type topology group 132 is the second reference end (BUS-M) of the T-type conversion unit 13. The first end of the second T-type topology group 132 is connected to the second inductor L2.

[0080] The second T-type topology group 132 includes: a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a third capacitor C3 and a fourth capacitor C4, and the specific connection relationship is as follows: Figure 2 As shown. The first end of the third capacitor C3 is connected to the second end (BUS+) of the second T-type topology group 132. The second end of the third capacitor C3 and the first end of the fourth capacitor C4 are both connected to the reference end (BUS-M) of the second T-type topology group 132. The second end of the fourth capacitor C4 is connected to the third end (BUS-) of the second T-type topology group 132.

[0081] The first end of the third T-type topology group 133 is the third first end of the T-type conversion unit 13. The reference end (BUS-M) of the third T-type topology group 133 is the third reference end (BUS-M) of the T-type conversion unit 13. The first end of the third T-type topology group 133 is connected to the third inductor L3.

[0082] The third T-type topology group 133 includes: a ninth switch tube Q9, a tenth switch tube Q10, an eleventh switch tube Q11, a twelfth switch tube Q12, a fifth capacitor C5 and a sixth capacitor C6, and the specific connection relationship is as follows: Figure 2 As shown. The first end of the fifth capacitor C5 is connected to the second end (BUS+) of the third T-type topology group 133. The second end of the fifth capacitor C5 and the first end of the sixth capacitor C6 are both connected to the reference end (BUS-M) of the third T-type topology group 133. The second end of the sixth capacitor C6 is connected to the third end (BUS-) of the third T-type topology group 133.

[0083] The first end of the fourth T-type topology group 134 is the fourth first end of the T-type conversion unit 13. The reference end (BUS-M) of the fourth T-type topology group 134 is the fourth reference end (BUS-M) of the T-type conversion unit 13. The first end of the fourth T-type topology group 134 is the fourth first end of the T-type conversion unit 13. The first end of the fourth T-type topology group 134 is connected to the fourth inductor L4.

[0084] The fourth T-type topology group 134 includes: a thirteenth switch tube Q13, a fourteenth switch tube Q14, a fifteenth switch tube Q15, a sixteenth switch tube Q16, a seventh capacitor C7 and an eighth capacitor C8, and the specific connection relationship is as follows: Figure 2As shown. The first end of the seventh capacitor C7 is connected to the second end (BUS+) of the fourth T-type topology group 134. The second end of the seventh capacitor C7 and the first end of the eighth capacitor C8 are both the reference end (BUS-M) of the fourth T-type topology group 134. The second end of the eighth capacitor C8 is connected to the third end (BUS-) of the fourth T-type topology group 134.

[0085] The second end (BUS+) of the first T-type topology group 131, the second end (BUS+) of the second T-type topology group 132, the second end (BUS+) of the third T-type topology group 133, and the second end (BUS+) of the fourth T-type topology group 134 are interconnected. The third end (BUS-) of the first T-type topology group 131, the third end (BUS-) of the second T-type topology group 132, the third end (BUS-) of the third T-type topology group 133, and the third end (BUS-) of the fourth T-type topology group 134 are connected. The reference end (BUS-M) of the first T-type topology group 131, the reference end (BUS-M) of the second T-type topology group 132, the reference end (BUS-M) of the third T-type topology group 133, and the reference end (BUS-M) of the fourth T-type topology group 134 are connected.

[0086] In some embodiments, as Figure 2 The first conversion unit 14 shown includes a first bridge type group 141 , a second bridge type group 142 , a third bridge type group 143 and a fourth bridge type group 144 .

[0087] The first input end of the first bridge group 141 is connected to the second end (BUS+) of the first T-type topology group 131 , and the second input end of the first bridge group 141 is connected to the reference end (BUS-M) of the first T-type topology group 131 .

[0088] The first bridge group 141 includes a seventeenth switch transistor Q17, an eighteenth switch transistor Q18, a nineteenth switch transistor Q19, and a twentieth switch transistor Q20. The first end of the seventeenth switch transistor Q17 and the first end of the nineteenth switch transistor Q19 serve as first inputs to the first bridge group 141. The second end of the eighteenth switch transistor Q18 and the second end of the twentieth switch transistor Q20 serve as second inputs to the first bridge group 141.

[0089] A first input terminal of the second bridge group 142 is connected to the reference terminal (BUS-M) of the first T-type topology group 131 , and a second input terminal of the second bridge group 142 is connected to the third terminal (BUS−) of the first T-type topology group 131 .

[0090] The second bridge group 142 includes a twenty-first switch Q21, a twenty-second switch Q22, a twenty-third switch Q23, and a twenty-fourth switch Q24. The first end of the twenty-first switch Q21 and the first end of the twenty-second switch Q22 serve as first inputs of the second bridge group 142. The second end of the twenty-third switch Q23 and the second end of the twenty-fourth switch Q24 serve as second inputs of the second bridge group 142.

[0091] A first input terminal of the third bridge group 143 is connected to the second terminal (BUS+) of the first T-type topology group 131 , and a second input terminal of the third bridge group 143 is connected to the reference terminal (BUS-M) of the first T-type topology group 131 .

[0092] The third bridge group 143 includes a twenty-fifth switch Q25, a twenty-sixth switch Q26, a twenty-seventh switch Q27, and a twenty-eighth switch Q28. The first end of the twenty-fifth switch Q25 and the first end of the twenty-sixth switch Q26 serve as first inputs to the third bridge group 143. The second end of the twenty-seventh switch Q27 and the second end of the twenty-eighth switch Q28 serve as second inputs to the third bridge group 143.

[0093] A first input terminal of the fourth bridge group 144 is connected to the second terminal (BUS+) of the first T-type topology group 131 , and a second input terminal of the fourth bridge group 144 is connected to the reference terminal (BUS-M) of the fourth T-type topology group 134 .

[0094] The fourth bridge group 144 includes a 29th switch Q29, a 30th switch Q30, a 31st switch Q31, and a 32nd switch Q32. The first end of the 29th switch Q29 and the first end of the 30th switch Q30 serve as the first input end of the fourth bridge group 144. The second end of the 31st switch Q31 and the second end of the 32nd switch Q32 serve as the second input end of the fourth bridge group 144.

[0095] In some embodiments, as Figure 2 The transformer unit 15 shown includes a first transformer group 151 , a second transformer group 152 , a third transformer group 153 and a fourth transformer group 154 ​​.

[0096] The first transformer group 151 includes a first resonant capacitor Cr1 , a first transformer T1 and a fifth resonant capacitor Cr5 .

[0097] The second transformer group 152 includes a second resonant capacitor Cr2, a second transformer T2 and a sixth resonant capacitor Cr6.

[0098] The third transformer group 153 includes a third resonant capacitor Cr3, a third transformer T3 and a seventh resonant capacitor Cr7.

[0099] The fourth transformer group 154 ​​includes a fourth resonant capacitor Cr4, a fourth transformer T4 and an eighth resonant capacitor Cr8.

[0100] In some embodiments, as Figure 2 The second conversion unit 16 shown includes a fifth bridge type group 161 , a sixth bridge type group 162 , a seventh bridge type group 163 and an eighth bridge type group 164 .

[0101] The fifth bridge group 161 includes: a thirty-third switch tube Q33, a thirty-fourth switch tube Q34, a thirty-fifth switch tube Q35, a thirty-sixth switch tube Q36 and a ninth capacitor C9, and the specific connection relationship is as follows: Figure 2 The first end of the 33rd switch tube Q33 and the first end of the 35th switch tube Q35 are the first output end of the fifth bridge group 161 , and the second end of the 34th switch tube Q34 and the second end of the 36th switch tube Q36 are the second output end of the fifth bridge group 161 .

[0102] The sixth bridge group 162 includes: a thirty-seventh switch tube Q37, a thirty-eighth switch tube Q38, a thirty-ninth switch tube Q39, a fortieth switch tube Q40 and a tenth capacitor C10, and the specific connection relationship is as follows: Figure 2 The first end of the 37th switch tube Q37 and the first end of the 38th switch tube Q38 are the first output end of the sixth bridge group 162 , and the second end of the 39th switch tube Q39 and the second end of the 40th switch tube Q40 are the second output end of the sixth bridge group 162 .

[0103] The seventh bridge group 163 includes: a 41st switch tube Q41, a 42nd switch tube Q42, a 43rd switch tube Q43, a 44th switch tube Q44 and an eleventh capacitor C11, and the specific connection relationship is as follows: Figure 2 The first end of the 41st switch tube Q41 and the first end of the 42nd switch tube Q42 are the first output end of the seventh bridge group 163 , and the second end of the 43rd switch tube Q43 and the second end of the 44th switch tube Q44 are the second output end of the seventh bridge group 163 .

[0104] The eighth bridge group 164 includes: a forty-fifth switch tube Q45, a forty-sixth switch tube Q46, a forty-seventh switch tube Q47, a forty-eighth switch tube Q48 and a twelfth capacitor C12, and the specific connection relationship is as follows: Figure 2 The first end of the 45th switch tube Q45 and the first end of the 47th switch tube Q47 are the first output end of the eighth bridge group 164 , and the second end of the 46th switch tube Q46 and the second end of the 48th switch tube Q48 are the second output end of the eighth bridge group 164 .

[0105] The first output terminal of the fifth bridge group 161 is connected to the first output terminal of the sixth bridge group 162 , and the second output terminal of the fifth bridge group 161 and the second output terminal of the sixth bridge group 162 are connected to the first ground terminal SGND1 .

[0106] The first output terminal of the seventh bridge group 163 is connected to the first output terminal of the eighth bridge group 164 , and the second output terminal of the seventh bridge group 163 and the second output terminal of the eighth bridge group 164 are connected to the first ground terminal SGND1 .

[0107] In some embodiments, as Figure 2 The second interface unit 17 shown includes a fifth switch element K5, a sixth switch element K6, a seventh switch element K7, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2 and a third resistor R3.

[0108] The first end of the fifth switch element K5 is connected to the first output end of the fifth bridge group 161 and the anode of the first diode D1, respectively. The second end of the fifth switch element K5 is connected to the cathode of the first diode D1, the first end of the first resistor R1, and the positive electrode of the energy storage device 400, respectively. The second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the second ground terminal SGND2. The first end of the sixth switch element K6 is connected to the first output end of the seventh bridge group 163 and the anode of the second diode D2, respectively. The second end of the sixth switch element K6 is connected to the cathode of the second diode D2, the first end of the first resistor R1, and the positive electrode of the energy storage device 400, respectively.

[0109] The present application also explains the charging process and the power supply process through the following embodiments. It should be noted that the following embodiments are only used to explain the present application in detail and are not intended to limit the present application.

[0110] The charging process of the energy storage device 400 is as follows: an alternating current (AC) voltage is connected to the first, second, third, and fourth interfaces AC1, AC2, AC3, and AC4. The control unit switches the first, second, third, and fourth switches K1, K2, K3, and K4 to normally closed positions. The AC voltage then flows through the input relay and the step-up / step-down inductors L1, L2, L3, and L4 to the MOSFETs Q1 through Q16 of the T-type converter unit 13. The control unit then controls the switches of the T-type converter unit 13 to generate four interleaved first DC voltages (PFC), each staggered by 90 degrees. The first to fourth switching transistors Q1 to Q4 form the first group, the fifth to eighth switching transistors Q5 to Q8 form the second group, the ninth to twelfth switching transistors Q9 to Q12 form the third group, and the thirteenth to sixteenth switching transistors Q13 to Q16 form the fourth group. They convert the AC voltage into low-ripple DC voltages BUS+, BUS-M, and BUS-. The control unit then controls the switching transistors (MOSFETs) of the first conversion unit 14 and the primary side of the transformer unit 15 to form four CLLC series resonant circuits. The seventeenth to twentieth switching transistors Q17 to Q20, along with the first resonant capacitor Cr1, the first resonant inductor Lr1, the first transformer, and the fifth resonant capacitor Cr5, form the first resonant circuit. The fifth resonant capacitor Cr5 is equivalent to the primary side and participates in the resonance. The twenty-first to twenty-fourth switching transistors Q21 to Q24, along with the second resonant capacitor Cr2, the second resonant inductor Lr2, the second transformer, and the sixth resonant capacitor Cr6, form the second resonant circuit. The sixth resonant capacitor Cr6 is equivalent to the primary side and participates in the resonance. The 25th to 28th switching transistors Q25 to Q28, along with the third resonant capacitor Cr3, the third resonant inductor Lr3, the third transformer, and the seventh resonant capacitor Cr7, form a third resonant circuit. The seventh resonant capacitor Cr7 is equivalent to the primary side and participates in resonance. The 29th to 32nd switching transistors Q29 to Q32, along with the fourth resonant capacitor Cr4, the fourth resonant inductor Lr4, the fourth transformer, and the eighth resonant capacitor, form a fourth resonant circuit. The eighth resonant capacitor is equivalent to the primary side and participates in resonance. The current then passes through the switching transistors (MOSFETs) of the second conversion unit 16, undergoing four corresponding rectifier groups: the 33rd to 36th switching transistors Q36 form the first group, the 37th to 40th switching transistors Q37 to Q40 form the second group, the 41st to 44th switching transistors Q41 to Q44 form the third group, and the 45th to 48th switching transistors Q45 to Q48 form the fourth group. The switching frequency of the second conversion unit 16 controlled by the control unit is equal to the resonant frequency of the first resonant unit, so that the switch tube of the first resonant unit realizes ZVS soft switching zero voltage turn-on and the second conversion unit 16 realizes zero current turn-off.

[0111] When the battery sampling circuit detects the battery's low-voltage sampling voltage Vref, it feeds back to the control unit, controlling the seventh switch K7 to switch to a normally closed switch. The first ground terminal SGND1 and the second ground terminal SGND2 are connected together, and VO1 and VO2 are then connected in parallel through the output backflow protection first diode D1 and the second diode D2 to charge the battery. If the battery sampling circuit detects the battery's high-voltage sampling voltage Vref, it feeds back to the control unit, controlling the seventh switch to switch to a normally open switch. The first ground terminal SGND1 and VO2 are connected together, and VO1 and VO2 are connected in series and then through the output backflow protection first diode D1 to charge the battery. The MOSFET in the first resonant unit achieves ZVS soft switching with zero voltage turn-on, and the MOSFET in the second conversion unit 16 achieves zero current turn-off. This significantly reduces MOSFET switching losses, greatly improves efficiency, reduces stress, reduces temperature rise, and reduces electromagnetic radiation, greatly enhancing the reliability of the converter.

[0112] The power supply process of the energy storage device 400 is as follows: When the battery sampling circuit detects the battery low-voltage sampling voltage Vref, it is fed back to the control unit to control the seventh switch element K7 to switch to a normally closed switch, connecting the first ground terminal SGND1 and the second ground terminal SGND2 together. The control unit controls the output of the fifth and sixth switches K5 and K6 to attract and conduct. The voltage of the energy storage device 400 reaches VO1 and VO2 through the fifth and sixth switches K5 and K6, and then passes through four groups of second resonant units (the 33rd to 36th switch tubes Q33 to Q36, the first resonant capacitor Cr1, the first resonant inductor Lr1, the first transformer, and the fifth resonant capacitor Cr5 form the first group. The first resonant capacitor Cr1 and the first resonant inductor Lr1 are equivalent to the secondary side and participate in resonance. The remaining three groups are similar and will not be repeated here). It then passes through four groups of first conversion units 14 (the 17th to 20th switch tubes Q17 to Q20 form the first group. The remaining three groups are similar and will not be repeated here). The switching frequency of the first conversion unit 14, controlled by the control unit, is equal to the resonant frequency of the second resonant unit, enabling the MOSFET of the second resonant unit to achieve ZVS soft switching, zero voltage conduction, and zero current shutdown. The output voltages BUS+, BUS-M, and BUS- are converted to an inverter consisting of four sets of T-type three-level converter MOSFETs and four sets of step-up / step-down inductors: the first inverter set is composed of the first to fourth switches Q1 to Q4 and the first inductor L1; the second inverter set is composed of the fifth to eighth switches Q5 to Q8 and the second inductor L2; the third inverter set is composed of the ninth to twelfth switches Q9 to Q12 and the third inductor L3; and the fourth inverter set is composed of the thirteenth to sixteenth switches Q13 to Q16 and the fourth inductor L4. The control unit outputs different voltage specifications based on the user's desired voltage by controlling the switching of the first, second, third, and fourth relays K1, K2, K3, and K4. If the first, second, third, and fourth relays K1, K2, K3, and K4 are normally closed, the control unit controls the phases of the first and second inverters to be aligned, and the third and fourth inverters to be aligned. The first, second, third, and fourth connectors AC1, AC2, AC3, and AC4 output four 110VAC voltages. If the first, second, third, and fourth relays K1, K2, K3, and K4 are normally open, the control unit controls the phases of the first and second inverters to be staggered by 180 degrees, and the third and fourth inverters to be staggered by 180 degrees. The fifth and sixth connectors AC5 and AC6 output two 220VAC voltages.If the first and second switches K1 and K2 are normally closed, and the third and fourth switches K3 and K4 are normally open, the control unit controls the first and second inverters to maintain phase alignment, and the third and fourth inverters to maintain phase alignment by 180 degrees. The first and second interfaces AC1 and AC2 output two 110VAC circuits, and the sixth interface AC6 outputs one 220VAC circuit. Furthermore, if the first and second switches K1 and K2 are normally open, and the third and fourth switches K3 and K4 are normally closed, the control unit controls the first and second inverters to maintain phase alignment by 180 degrees, and the third and fourth inverters to maintain phase alignment. The fifth interface AC5 outputs one 220VAC circuit, and the third and fourth interfaces AC3 and AC4 output two 110VAC circuits. These circuits simultaneously supply different AC loads.

[0113] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A bidirectional voltage conversion circuit, characterized in that: The first end of the bidirectional voltage conversion circuit is used to connect to a power supply device or a power consumption device, and the second end of the bidirectional voltage conversion circuit is used to connect to an energy storage device, including: The first interface unit includes: a first interface component, a second interface component, a third interface component, a fourth interface component, a fifth interface component, a sixth interface component, a first switch component, a second switch component, a third switch component and a fourth switch component. The first interface component, the second interface component, the third interface component, the fourth interface component, the fifth interface component and the sixth interface component are all used to connect the power supply device or the power-consuming device. The first end of the first interface component is connected to the first selection end of the first switch component, the second end of the first interface component is connected to the first reference end of the T-type conversion unit, the first end of the fifth interface component is connected to the second selection end of the first switch component; the first end of the second interface component is connected to the The first selection end of the second switch component is connected, the second end of the second interface component is connected to the second reference end of the T-type conversion unit, and the second end of the fifth interface component is connected to the second selection end of the second switch component; the first end of the third interface component is connected to the first selection end of the third switch component, the second end of the third interface component is connected to the third reference end of the T-type conversion unit, and the first end of the sixth interface component is connected to the second selection end of the third switch component; the first end of the fourth interface component is connected to the first selection end of the second switch component, the second end of the fourth interface component is connected to the fourth reference end of the T-type conversion unit, and the second end of the sixth interface component is connected to the second selection end of the fourth switch component; a buck-boost unit, the buck-boost unit comprising: a first inductor, a second inductor, a third inductor, and a fourth inductor, wherein a first end of the first inductor is connected to a common end of the first switch; a first end of the second inductor is connected to a common end of the second switch; a first end of the third inductor is connected to a common end of the third switch; and a first end of the fourth inductor is connected to a common end of the fourth switch; The T-type conversion unit comprises: a first T-type topology group, a second T-type topology group, a third T-type topology group and a fourth T-type topology group; the reference end of the first T-type topology group is the first reference end of the T-type conversion unit, and the first end of the first T-type topology group is connected to the second end of the first inductor; the reference end of the second T-type topology group is the second reference end of the T-type conversion unit, and the first end of the second T-type topology group is connected to the second end of the second inductor; the reference end of the third T-type topology group is the third reference end of the T-type conversion unit, and the first end of the third T-type topology group is connected to the second end of the third inductor; the fourth T-type The reference end of the topology group is the fourth reference end of the T-type conversion unit, and the first end of the fourth T-type topology group is connected to the second end of the fourth inductor; wherein the second end of the first T-type topology group, the second end of the second T-type topology group, the second end of the third T-type topology group, and the second end of the fourth T-type topology group are connected, and the third end of the first T-type topology group, the third end of the second T-type topology group, the third end of the third T-type topology group, and the third end of the fourth T-type topology group are connected; the reference end of the first T-type topology group, the reference end of the second T-type topology group, the reference end of the third T-type topology group, and the reference end of the fourth T-type topology group are connected; A first conversion unit, the first conversion unit comprising: a first bridge type group, a second bridge type group, a third bridge type group and a fourth bridge type group; a first input end of the first bridge type group is connected to the second end of the first T-type topology group, and a second input end of the first bridge type group is connected to a reference end of the first T-type topology group; a first input end of the second bridge type group is connected to the reference end of the first T-type topology group, and a second input end of the second bridge type group is connected to a third end of the first T-type topology group; a first input end of the third bridge type group is connected to the second end of the first T-type topology group, and a second input end of the third bridge type group is connected to the reference end of the first T-type topology group; a first input end of the fourth bridge type group is connected to the second end of the first T-type topology group, and a second input end of the fourth bridge type group is connected to the reference end of the fourth T-type topology group; a voltage transformation unit, wherein the four first input terminals of the voltage transformation unit are respectively connected to the first output terminal of the first bridge type group, the first output terminal of the second bridge type group, the first output terminal of the third bridge type group, and the first output terminal of the fourth bridge type group; and the four second input terminals of the voltage transformation unit are respectively connected to the second output terminal of the first bridge type group, the second output terminal of the second bridge type group, the second output terminal of the third bridge type group, and the second output terminal of the fourth bridge type group; a second conversion unit, the second conversion unit comprising: a fifth bridge type group, a sixth bridge type group, a seventh bridge type group, and an eighth bridge type group, wherein the first input end of the fifth bridge type group, the first input end of the sixth bridge type group, the first input end of the seventh bridge type group, and the first input end of the eighth bridge type group are respectively connected to the four first output ends of the transformation unit, and the second input end of the fifth bridge type group, the second input end of the sixth bridge type group, the second input end of the seventh bridge type group, and the second input end of the eighth bridge type group are respectively connected to the four second output ends of the transformation unit; a second interface unit, wherein the first input end of the second interface unit is respectively connected to the first output end of the fifth bridge type group and the first output end of the sixth bridge type group, the second input end of the second interface unit is respectively connected to the first output end of the seventh bridge type group and the first output end of the eighth bridge type group, the output end of the second interface unit is used to connect to the energy storage device, the second output end of the fifth bridge type group and the second output end of the sixth bridge type group are connected to the first ground end, and the second output end of the seventh bridge type group and the second output end of the eighth bridge type group are connected to the second ground end; A control unit, the control unit is used to: during the process of charging the energy storage device, control the T-type conversion unit to output four groups of first DC voltages with equal phase intervals of 90° to the first conversion unit, the first conversion unit and the primary side of the transformer unit constitute a first resonance unit, and control the resonance frequency of the first resonance unit to be the same as the switching frequency of the second conversion unit; the control unit is also used to, during the process of powering the electrical equipment, control the second conversion unit and the secondary side of the transformer unit to constitute a second resonance unit, control the resonance frequency of the second resonance unit to be the same as the switching frequency of the first conversion unit, and control the T-type conversion unit to output two groups of power supply AC voltages, and control the phase of the power supply AC voltage to output multiple output AC voltages at the first interface unit.

2. The bidirectional voltage conversion circuit according to claim 1, wherein: The transformer unit includes: a first transformer group, a second transformer group, a third transformer group and a fourth transformer group; The first transformer group includes: a first resonant capacitor, a first resonant inductor, a first transformer and a fifth resonant capacitor; The second transformer group includes: a second resonant capacitor, a second resonant inductor, a second transformer and a sixth resonant capacitor; The third transformer group includes: a third resonant capacitor, a third resonant inductor, a third transformer and a seventh resonant capacitor; The fourth transformer group includes: a fourth resonant capacitor, a fourth resonant inductor, a fourth transformer and an eighth resonant capacitor.

3. The bidirectional voltage conversion circuit according to claim 2, wherein: The second interface unit includes: a fifth switch element, a sixth switch element, a seventh switch element, a first diode, a second diode, a first resistor, a second resistor and a third resistor; The first end of the fifth switch element is respectively connected to the first output end of the fifth bridge group and the anode of the first diode, and the second end of the fifth switch element is respectively connected to the cathode of the first diode, the first end of the first resistor, and the positive electrode of the energy storage device; the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the second ground terminal, and the second end of the third resistor is also connected to the negative electrode of the energy storage device; the first end of the sixth switch element is respectively connected to the first output end of the seventh bridge group and the anode of the second diode, and the second end of the sixth switch element is respectively connected to the cathode of the second diode, the first end of the first resistor, and the positive electrode of the energy storage device, the common end of the seventh switch element is connected to the first ground terminal, the first selection end of the seventh switch element is connected to the second ground terminal, and the second selection end of the seventh switch element is connected to the first output end of the seventh bridge group.

4. An electronic device, characterized in that: The electronic device includes the bidirectional voltage conversion circuit according to any one of claims 1 to 3.

Images