Bidirectional voltage conversion circuit and electronic equipment

Abstract

The invention provides a bidirectional voltage conversion circuit and electronic equipment, and the circuit comprises a first interface unit, a buck-boost unit, a T-type conversion unit, a first conversion unit, a transformation unit, a second conversion unit, a second interface unit, and a control unit. The T-shaped conversion unit is controlled to output four groups of first direct-current voltages with the phase equal difference value of 90 degrees to the first conversion unit, the first conversion unit and the primary side of the transformation unit form a first resonance unit, and the resonance frequency of the first resonance unit is controlled to be the same as the frequency of a switching piece of the second conversion unit; during discharging, the second conversion unit and the secondary side of the voltage transformation unit form a second resonance unit, the resonance frequency of the second resonance unit is controlled to be the same as the frequency of the switching element of the first conversion unit, the T-shaped conversion unit is controlled to output two groups of power supply alternating-current voltages, and the phase of the power supply alternating-current voltages is controlled; the first interface unit outputs a plurality of output AC voltages.

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] At present, with the rapid development of industrialization, the current global energy consumption is increasing, and higher requirements are put forward for improving the efficiency and high reliability of products and energy conservation and environmental protection. Therefore, a bidirectional converter circuit with wide input voltage and wide output voltage, low ripple, high efficiency, high reliability, good quality and low price is invented, which can charge batteries in the fields of charging piles, electric vehicle batteries, industrial power batteries, UPS (uninterruptible power supply), MPPT (solar photovoltaic) batteries, or energy storage products, and discharge batteries of these related products. A multi-purpose bidirectional converter circuit that can realize AC to DC conversion and DC to AC conversion. The existing open power converter circuit cannot realize the simultaneous output of several amplitude voltages at the same time when discharging in reverse, that is, inverting. 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 a power supply device or a power consumption device, and a second end of the bidirectional voltage conversion circuit is used to connect an energy storage device, including: A first interface unit, wherein a first end of the first interface unit is used to connect the power supply device or the power consumption device; a buck-boost unit, wherein a first end of the buck-boost unit is connected to a second end of the first interface unit; A T-type conversion unit, a first end of the T-type conversion unit is connected to a second end of the buck-boost unit; 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; a voltage transformation unit, wherein a first end of the unit is connected to a second end of the first conversion unit, the voltage transformation unit; a second conversion unit, wherein a first end of the second conversion unit is connected to a second end of the voltage transformation unit; A second interface unit, 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; 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 difference of 90° to the first conversion unit, the first conversion unit and the primary side of the transformer unit form 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, the second conversion unit and the secondary side of the transformer unit form 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.

[0005] 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; 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; 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; 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; 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.

[0006] In some embodiments, the buck-boost unit includes: a first inductor, a second inductor, a third inductor, and a fourth inductor; 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; 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, and the second end of the second inductor is connected to the second first end of the T-type conversion unit; 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, and the second end of the third inductor is connected to the third first end of the T-type conversion unit; 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, and the second end of the fourth inductor is connected to the fourth first end of the T-type conversion unit.

[0007] 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; 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; 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; 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; 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.

[0008] 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.

[0009] 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; The first input end of the first bridge type group is connected to the second end of the first T-type topology group, and the second input end of the first bridge type group is connected to the reference end of the first T-type topology group; The first input end of the second bridge type group is connected to the reference end of the first T-type topology group, and the second input end of the second bridge type group is connected to the third end of the first T-type topology group; The first input end of the third bridge type group is connected to the second end of the first T-type topology group, and the second input end of the third bridge type group is connected to the reference end of the first T-type topology group; 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.

[0010] In some embodiments, 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 transformer and a fifth resonant capacitor; The second transformer group includes: a second resonant capacitor, a second transformer and a sixth resonant capacitor; The third transformer group includes: a third resonant capacitor, a third transformer and a seventh resonant capacitor; The fourth transformer group includes: a fourth resonant capacitor, a fourth transformer and an eighth resonant capacitor.

[0011] 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; 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; 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.

[0012] 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; 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.

[0013] In a second aspect, an embodiment of the present application provides an electronic device, wherein the electronic device includes the bidirectional voltage conversion circuit as described in the embodiment of the present application.

[0014] The 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, and 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 an 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 difference 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 switch frequency of the second conversion unit; the control unit is also used for the process of supplying power to the electrical equipment, the secondary side of the second conversion unit and the transformer unit constitute a second resonance unit, the resonance frequency of the second resonance unit is controlled to be the same as the switch frequency of the first conversion unit, and the T-type conversion unit is controlled to output two groups of power supply AC voltages, and the phase of the power supply AC voltage is controlled to output multiple output AC voltages at the first interface unit. The beneficial effects achieved by the above method include: 1. Realize wide voltage input and wide voltage output at the same time.

[0015] 2. The control unit can be used to control the T-type conversion unit to achieve the staggering of 4 first DC voltages (PFC). Each first DC voltage is staggered by 90° to reduce the ripple, thereby reducing the bus capacitance and the step-up / step-down inductance, improving the capacitor life and the reliability of the converter, and reducing the cost.

[0016] 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 to improve efficiency, reduce the stress, temperature, and electromagnetic radiation of the MOSFET device, and improve product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0018] Figure 1 A schematic block diagram of a bidirectional voltage conversion circuit provided in an embodiment of the present application; Figure 2 A circuit diagram of a bidirectional voltage conversion circuit provided in an embodiment of the present application.

[0019] Description of reference numerals: 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, The seventh bridge group; 164, the eighth bridge group; 17, the second interface unit; AC1, the first interface component; AC2, the second interface component; AC3, the third interface component; AC4, the fourth interface component; AC5, the fifth interface component; AC6, the sixth interface component; K1, the first switch component; K2, the second switch component; K3, the third switch component; K4, the fourth switch component; K5, the fifth switch component; K6, the sixth switch component; K7, the seventh switch component; L1, the first inductor; L2, the second inductor; L3, the third inductor; L4, the fourth inductor; Q1, the first switch tube; Q2, the second switch tube; Q3, the third switch tube; Q4, the fourth switch tube; Q5, the fifth switch tube; Q6, the sixth switch tube; Q7, the seventh switch tube; Q8, the eighth switch tube; Q9, the ninth switch tube; Q10, the tenth switch tube; Q11, the eleventh switch tube; Q12, the twelfth switch tube; Q13, the thirteenth switch tube; Q14, the fourteenth switch tube; Q15, the fifteenth switch tube; Q16, the sixteenth switch tube; Q17, the seventeenth switch tube; Q18, the eighteenth switch tube; Q19, the nineteenth switch tube; Q20, the twentieth switch tube; Q21, the twenty-first switch tube; Q22, the twenty-second switch tube; Q23, the twenty-third switch tube; Q24, the twenty-fourth switch tube; Q25, the twenty-fifth switch tube; Q26, the twenty-sixth switch tube; Q27, the twenty-seventh switch tube; Q28, the twenty-eighth switch tube; Q29, the twenty-ninth switch tube; Q30, the thirtieth switch tube off tube; Q31, the thirty-first switch tube; Q32, the thirty-second switch tube; Q33, the thirty-third switch tube; Q34, the thirty-fourth switch tube; Q35, the thirty-fifth switch tube; Q36, the thirty-sixth switch tube; Q37, the thirty-seventh switch tube; Q38, the thirty-eighth switch tube; Q39, the thirty-ninth switch tube; Q40, the fortieth switch tube; Q41, the forty-first switch tube; Q42, the forty-second switch tube; Q43, the forty-third switch tube; Q44, the forty-fourth switch tube; Q45, the forty-fifth switch tube; Q46, the forty-sixth switch tube; Q47, the forty-seventh switch tube; Q48, the forty-eighth switch tube; 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

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0022] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0023] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0024] The 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 provided in the embodiment of the present application is used to charge the energy storage device through the power supply device, or to supply power to the power consumption device through the energy storage device.

[0025] 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 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 conversion unit 14, 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, 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, the first end of 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 the energy storage device 400. The control unit is used to: during the process of charging the energy storage device 400, control the T-type conversion unit 13 to output four groups of first DC voltages with equal phase difference of 90° to the first conversion unit 14, the primary side of the first conversion unit 14 and the transformer unit 15 form a first resonance unit, and control the resonance frequency of the first resonance unit to be the same as the switch frequency of the second conversion unit 16. The control unit is also used to control the secondary side of the second conversion unit 16 and the transformer unit 15 to form a second resonance unit during the process of powering the electrical device 300, control the resonance frequency of the second resonance unit to be the same as the switch frequency of the first conversion unit 14, and control the T-type conversion unit 13 to output two groups of power supply AC voltages, and control the phase of the power supply AC voltage, so as to output multiple output AC voltages at the first interface unit 11.

[0026] The 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, and 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 an 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 difference 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 switch frequency of the second conversion unit; the control unit is also used for the process of supplying power to the electrical equipment, the secondary side of the second conversion unit and the transformer unit constitute a second resonance unit, the resonance frequency of the second resonance unit is controlled to be the same as the switch frequency of the first conversion unit, and the T-type conversion unit is controlled to output two groups of power supply AC voltages, and the phase of the power supply AC voltage is controlled to output multiple output AC voltages at the first interface unit. The beneficial effects achieved by the above method include: 1. Realize wide voltage input and wide voltage output at the same time.

[0027] 2. The control unit can be used to control the T-type conversion unit to achieve the staggering of 4 first DC voltages (PFC). Each first DC voltage is staggered by 90° to reduce the ripple, thereby reducing the bus capacitance and the step-up / step-down inductance, improving the capacitor life and the reliability of the converter, and reducing the cost.

[0028] 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 to improve efficiency, reduce the stress, temperature, and electromagnetic radiation of the MOSFET device, and improve product reliability.

[0029] 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.

[0030] See also Figure 2 , Figure 2 An embodiment of the present application also provides a circuit schematic diagram of a bidirectional voltage conversion circuit.

[0031] In some embodiments, 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In some embodiments, 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.

[0037] The first end of the first inductor L1 is the first first end of the buck-boost unit 12 , the first end of the first inductor L1 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 .

[0038] The first end of the second inductor L2 is the second first end of the buck-boost unit 12 , the first end of the second inductor L2 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 .

[0039] The first end of the third inductor L3 is the third first end of the buck-boost unit 12 , the first end of the third inductor L3 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 .

[0040] 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 .

[0041] In some embodiments, 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 .

[0042] 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, and 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.

[0043] 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 end of the third switch tube Q3 is the reference end (BUS-M) of the first T-type topology group 131. The first end of the first capacitor C1 is the second end (BUS+) of the first T-type topology group 131. The second end of the first capacitor C1 and the first end of the second capacitor are both the reference end (BUS-M) of the first T-type topology group 131. The second end of the second capacitor is the third end (BUS-) of the first T-type topology group 131.

[0044] 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, and the first end of the second T-type topology group 132 is the second first end 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.

[0045] 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 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 the reference end (BUS-M) of the second T-type topology group 132. The second end of the fourth capacitor C4 is the third end (BUS-) of the second T-type topology group 132.

[0046] 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, and the first end of the third T-type topology group 133 is the third first end 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.

[0047] 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 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 the reference end (BUS-M) of the third T-type topology group 133. The second end of the sixth capacitor C6 is the third end (BUS-) of the third T-type topology group 133.

[0048] 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, and 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.

[0049] 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 2 As shown. The first end of the seventh capacitor C7 is 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 the third end (BUS-) of the fourth T-type topology group 134.

[0050] 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 connected to each other. 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.

[0051] In some embodiments, 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 .

[0052] 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 .

[0053] The first bridge group 141 includes: a seventeenth switch tube Q17, an eighteenth switch tube Q18, a nineteenth switch tube Q19, and a twentieth switch tube Q20. The first end of the seventeenth switch tube Q17 and the first end of the nineteenth switch tube Q19 are both first input ends of the first bridge group 141, and the second end of the eighteenth switch tube Q18 and the second end of the twentieth switch tube Q20 are both second input ends of the first bridge group 141.

[0054] A first input end of the second bridge group 142 is connected to the reference end (BUS-M) of the first T-type topology group 131 , and a second input end of the second bridge group 142 is connected to the third end (BUS−) of the first T-type topology group 131 .

[0055] The second bridge group 142 includes: a twenty-first switch tube Q21, a twenty-second switch tube Q22, a twenty-third switch tube Q23, and a twenty-fourth switch tube Q24. The first end of the twenty-first switch tube Q21 and the first end of the twenty-second switch tube Q22 are both first input ends of the second bridge group 142, and the second end of the twenty-third switch tube Q23 and the second end of the twenty-fourth switch tube Q24 are both second input ends of the second bridge group 142.

[0056] The first input end of the third bridge group 143 is connected to the second end (BUS+) of the first T-type topology group 131 , and the second input end of the third bridge group 143 is connected to the reference end (BUS-M) of the first T-type topology group 131 .

[0057] The third bridge group 143 includes: a twenty-fifth switch tube Q25, a twenty-sixth switch tube Q26, a twenty-seventh switch tube Q27, and a twenty-eighth switch tube Q28. The first end of the twenty-fifth switch tube Q25 and the first end of the twenty-sixth switch tube Q26 are both first input ends of the third bridge group 143, and the second end of the twenty-seventh switch tube Q27 and the second end of the twenty-eighth switch tube Q28 are both second input ends of the third bridge group 143.

[0058] The first input end of the fourth bridge group 144 is connected to the second end (BUS+) of the first T-type topology group 131 , and the second input end of the fourth bridge group 144 is connected to the reference end (BUS-M) of the fourth T-type topology group 134 .

[0059] The fourth bridge group 144 includes: a twenty-ninth switch tube Q29, a thirtieth switch tube Q30, a thirty-first switch tube Q31 and a thirty-second switch tube Q32. The first end of the twenty-ninth switch tube Q29 and the first end of the thirtieth switch tube Q30 are both first input ends of the fourth bridge group 144, and the second end of the thirty-first switch tube Q31 and the second end of the thirty-second switch tube Q32 are both second input ends of the fourth bridge group 144.

[0060] In some embodiments, 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 ​​.

[0061] The first transformer group 151 includes: a first resonant capacitor Cr1, a first transformer T1 and a fifth resonant capacitor Cr5.

[0062] The second transformer group 152 includes: a second resonant capacitor Cr2, a second transformer T2 and a sixth resonant capacitor Cr6.

[0063] The third transformer group 153 includes: a third resonant capacitor Cr3, a third transformer T3 and a seventh resonant capacitor Cr7.

[0064] The fourth transformer group 154 ​​includes: a fourth resonant capacitor Cr4, a fourth transformer T4 and an eighth resonant capacitor Cr8.

[0065] In some embodiments, 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 .

[0066] 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 thirty-third switch tube Q33 and the first end of the thirty-fifth switch tube Q35 are the first output end of the fifth bridge group 161 , and the second end of the thirty-fourth switch tube Q34 and the second end of the thirty-sixth switch tube Q36 are the second output end of the fifth bridge group 161 .

[0067] 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 thirty-seventh switch tube Q37 and the first end of the thirty-eighth switch tube Q38 are the first output end of the sixth bridge group 162 , and the second end of the thirty-ninth switch tube Q39 and the second end of the fortieth switch tube Q40 are the second output end of the sixth bridge group 162 .

[0068] The seventh bridge group 163 includes: a forty-first switch tube Q41, a forty-second switch tube Q42, a forty-third switch tube Q43, a forty-fourth switch tube Q44 and an eleventh capacitor C11, and the specific connection relationship is as follows: Figure 2 The first end of the forty-first switch tube Q41 and the first end of the forty-second switch tube Q42 are the first output end of the seventh bridge group 163 , and the second end of the forty-third switch tube Q43 and the second end of the forty-fourth switch tube Q44 are the second output end of the seventh bridge group 163 .

[0069] 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 .

[0070] The first output end of the fifth bridge group 161 is connected to the first output end of the sixth bridge group 162 , and the second output end of the fifth bridge group 161 and the second output end of the sixth bridge group 162 are connected to the first ground terminal SGND1 .

[0071] 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 .

[0072] In some embodiments, 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.

[0073] The first end of the fifth switch element K5 is respectively connected to the first output end of the fifth bridge group 161 and the anode of the first diode D1, and the second end of the fifth switch element K5 is respectively 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. 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 respectively connected to the first output end of the seventh bridge group 163 and the anode of the second diode D2, and the second end of the sixth switch element K6 is respectively 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.

[0074] 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.

[0075] The charging process of the energy storage device 400 is as follows: the alternating current (AC) voltage is connected to the first interface component AC1, the second interface component AC2, the third interface component AC3, and the fourth interface component AC4. The control unit controls the input of the first switch component K1, the second switch component K2, the third switch component K3, and the fourth switch component K4 to switch to the normally closed switch. The AC voltage passes through the input relay and the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 of the step-up / step-down inductor to reach the switch tube (MOSFET) of the T-type conversion unit 13: the first switch tube Q1 to the sixteenth switch tube Q16. The control unit controls the switch tubes of the T-type conversion unit 13 to form four groups of staggered first DC voltages (PFC), each group of which is staggered by 90°. The first switch tube Q1 to the fourth switch tube Q4 form the first group, the fifth switch tube Q5 to the eighth switch tube Q8 form the second group, the ninth switch tube Q9 to the twelfth switch tube Q12 form the third group, and the thirteenth switch tube Q13 to the sixteenth switch tube Q16 form the fourth group, which convert the AC voltage into a DC voltage BUS+, BUS-M, and BUS- with very low ripple. The control unit then controls the switch tube (MOSFET) of the first conversion unit 14 and the primary side of the transformer unit 15 to form four groups of CLLC series resonant circuits, and the seventeenth switch tube Q17 to the twentieth switch tube Q20 and the first resonant capacitor Cr1, the first resonant inductor Lr1, the first transformer and the fifth resonant capacitor Cr5 form the first group of resonant circuits, and the fifth resonant capacitor Cr5 is equivalent to the primary side to participate in the resonance. The twenty-first switch tube Q21 to the twenty-fourth switch tube Q24 and the second resonant capacitor Cr2, the second resonant inductor Lr2, the second transformer and the sixth resonant capacitor Cr6 form the second group of resonant circuits, and the sixth resonant capacitor Cr6 is equivalent to the primary side to participate in the resonance. The twenty-fifth switch tube Q25 to the twenty-eighth switch tube Q28 and the third resonant capacitor Cr3, the third resonant inductor Lr3, the third transformer and the seventh resonant capacitor Cr7 form a third group of resonant circuits, and the seventh resonant capacitor Cr7 is equivalent to the primary side to participate in the resonance. The twenty-ninth switch tube Q29 to the thirty-second switch tube Q32 and the fourth resonant capacitor Cr4, the fourth resonant inductor Lr4, the fourth transformer and the eighth resonant capacitor form a fourth group of resonant circuits, and the eighth resonant capacitor is equivalent to the primary side to participate in the resonance. Then, through the switch tube (MOSFET) of the second conversion unit 16, the corresponding four groups of rectifiers are respectively performed: the thirty-third switch tube Q33 to the thirty-sixth switch tube Q36 are the first group, the thirty-seventh switch tube Q37 to the fortieth switch tube Q40 are the second group, the forty-first switch tube Q41 to the forty-fourth switch tube Q44 are the third group, and the forty-fifth switch tube Q45 to the forty-eighth switch tube Q48 are 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.

[0076] When the battery sampling circuit detects the battery low voltage sampling voltage Vref, it feeds back to the control unit to control the seventh switch K7 to switch to the normally closed switch, the first ground terminal SGND1 and the second ground terminal SGND2 are connected together, and VO1 and VO2 are connected in parallel through the output anti-backflow first diode D1 and the second diode D2 to charge the battery. If the battery sampling circuit detects the battery high voltage sampling voltage Vref, it feeds back to the control unit to control the seventh switch to switch to the normally open switch, the first ground terminal SGND1 and VO2 are connected together, VO1 and VO2 are connected in series and then through the output anti-backflow first diode D1 to charge the battery. The MOSFET of the first resonant unit realizes ZVS soft switching zero voltage conduction, and the MOSFET of the second conversion unit 16 realizes zero current shutdown, the switching loss of the MOSFET is greatly reduced, the efficiency is greatly improved, the stress is reduced, the temperature rise is reduced, and the electromagnetic radiation is reduced, so that the reliability of the converter is greatly improved.

[0077] The power supply process of the energy storage device 400: when the battery sampling circuit detects that the battery low voltage sampling voltage Vref is fed back to the control unit to control the seventh switch element K7 to switch to a normally closed switch, the first ground terminal SGND1 is connected to the second ground terminal SGND2, and the control unit controls the output of the fifth switch element K5 and the sixth switch element K6 to be attracted and turned on. The voltage of the energy storage device 400 passes through the fifth switch element K5 and the sixth switch element K6 to reach VO1 and VO2, and then passes through 4 groups of second resonance units (the 33rd switch tube Q33 to the 36th switch tube Q36 and the first resonance capacitor Cr1, the first resonance inductor Lr1, the first transformer and the fifth resonance capacitor Cr5 are the first group, the first resonance capacitor Cr1 and the first resonance inductor Lr1 are equivalent to the secondary side to participate in the resonance, and the remaining three groups are analogous to each other, and no further description is given), and then respectively passes through 4 groups of first conversion units 14 (the 17th switch tube Q17 to the 20th switch tube Q20 are the first group, and the remaining three groups are analogous to each other, and no further description is given). 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, so that the MOSFET of the second resonant unit realizes ZVS soft switching zero voltage conduction, and the MOSFET of the second resonant unit realizes zero current shutdown. The output voltages BUS+, BUS-M, and BUS- are respectively connected to the inverters composed of 4 groups of T-type three-level converter MOSFETs and 4 groups of step-up / step-down inductors: the first switch tube Q1 to the fourth switch tube Q4 and the first inductor L1 are the first group of inverters; the fifth switch tube Q5 to the eighth switch tube Q8 and the second inductor L2 are the second group of inverters; the ninth switch tube Q9 to the twelfth switch tube Q12 and the third inductor L3 are the third group of inverters; the thirteenth switch tube Q13 to the sixteenth switch tube Q16 and the fourth inductor L4 are the fourth group of inverters. The control unit outputs different voltage specifications by controlling the switching of the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 according to the voltage required by the user; if the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are switched to be normally closed, the control unit controls the phase of the first inverter group and the second inverter group to be non-phased, the phase of the third inverter group and the fourth inverter group to be non-phased, and the first interface AC1, the second interface AC2, the third interface AC3, and the fourth interface AC4 output 4 110VAC voltages. If the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are switched to be normally open, the control unit controls the phase of the first inverter group and the second inverter group to be 180 degrees out of phase, the phase of the third inverter group and the fourth inverter group to be 180 degrees out of phase, and the fifth interface AC5 and the sixth interface AC6 output 2 220VAC voltages.If the first switch K1 and the second switch K2 are switched to be normally closed, and the third switch K3 and the fourth switch K4 are switched to be normally open, the control unit controls the phases of the first inverter group and the second inverter group to be non-phased, and the phases of the third inverter group and the fourth inverter group to be staggered by 180 degrees, and the first interface AC1 and the second interface AC2 ports output 2 110VAC, and the sixth interface AC6 outputs 1 220VAC. If the first switch K1 and the second switch K2 are switched to be normally open, and the third switch K3 and the fourth switch K4 are switched to be normally closed, the control unit controls the phases of the first inverter group and the second inverter group to be staggered by 180 degrees, and the phases of the third inverter group and the fourth inverter group to be non-phased, and the fifth interface AC5 outputs 1 220VAC, and the third interface AC3 and the fourth interface AC4 ports output 2 110VAC. Supply different AC loads at the same time.

[0078] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope 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: A first interface unit, wherein a first end of the first interface unit is used to connect the power supply device or the power consumption device; a buck-boost unit, wherein a first end of the buck-boost unit is connected to a second end of the first interface unit; A T-type conversion unit, a first end of the T-type conversion unit is connected to a second end of the buck-boost unit; 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; a voltage transformation unit, wherein a first end of the unit is connected to a second end of the first conversion unit, the voltage transformation unit; a second conversion unit, wherein a first end of the second conversion unit is connected to a second end of the voltage transformation unit; A second interface unit, 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; 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 difference of 90° to the first conversion unit, the first conversion unit and the primary side of the transformer unit form 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, the second conversion unit and the secondary side of the transformer unit form 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, characterized in that: 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 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; 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; 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; 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.

3. The bidirectional voltage conversion circuit according to claim 2, characterized in that: The buck-boost unit comprises: a first inductor, a second inductor, a third inductor and a fourth inductor; 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; 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, and the second end of the second inductor is connected to the second first end of the T-type conversion unit; 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, and the second end of the third inductor is connected to the third first end of the T-type conversion unit; 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, and the second end of the fourth inductor is connected to the fourth first end of the T-type conversion unit.

4. The bidirectional voltage conversion circuit according to claim 3, characterized in that: 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; 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; 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; 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; 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; 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.

5. The bidirectional voltage conversion circuit according to claim 4, characterized in that: 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; The first input end of the first bridge type group is connected to the second end of the first T-type topology group, and the second input end of the first bridge type group is connected to the reference end of the first T-type topology group; The first input end of the second bridge type group is connected to the reference end of the first T-type topology group, and the second input end of the second bridge type group is connected to the third end of the first T-type topology group; The first input end of the third bridge type group is connected to the second end of the first T-type topology group, and the second input end of the third bridge type group is connected to the reference end of the first T-type topology group; 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.

6. The bidirectional voltage conversion circuit according to claim 5, characterized in that: The transformer unit comprises: 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.

7. The bidirectional voltage conversion circuit according to claim 5, characterized in that: 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; 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; 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.

8. The bidirectional voltage conversion circuit according to claim 7, characterized in that: 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, 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.

9. An electronic device, characterized in that: The electronic device comprises the bidirectional voltage conversion circuit according to any one of claims 1 to 8.

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