CN220022645U - Alternating current/direct current bidirectional conversion circuit of charging pile - Google Patents
Alternating current/direct current bidirectional conversion circuit of charging pile Download PDFInfo
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- CN220022645U CN220022645U CN202321156494.3U CN202321156494U CN220022645U CN 220022645 U CN220022645 U CN 220022645U CN 202321156494 U CN202321156494 U CN 202321156494U CN 220022645 U CN220022645 U CN 220022645U
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 64
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 54
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Rectifiers (AREA)
Abstract
The utility model discloses an alternating current/direct current bidirectional conversion circuit of a charging pile, which comprises a three-phase PFC circuit, a DC/DC bidirectional conversion circuit and a V2V output circuit, wherein the three-phase PFC circuit comprises three PFC inductors, and the V2V output circuit comprises an anode output pin, a cathode output pin, an output capacitor and two three-phase power relays; the input ends of the three PFC inductors are respectively connected with three pins of a three-phase power supply through three main contacts of a first three-phase power relay, and are connected with an anode output pin through three main contacts of a second three-phase power relay; two ends of the output capacitor are respectively connected with a positive electrode output pin and a negative electrode output pin; the control end of the first three-phase power relay and the control end of the second three-phase power relay are respectively connected with the control circuit. The utility model realizes the output of the three-phase alternating current inversion compatible reverse direct current conversion by utilizing the switching of the two three-phase power relays, and has simple circuit structure and lower cost.
Description
[ technical field ]
The utility model relates to a bidirectional charging pile, in particular to an alternating current/direct current bidirectional conversion circuit of a charging pile.
[ background Art ]
In the field of high-power alternating current-direct current (AC-DC), direct current-alternating current (DC-AC) and reverse direct current-direct current (DC-DC) bidirectional charging piles, in order to meet the requirements of direct current-alternating current inversion, application scenes comprise V2G (vehicle-to-power grid), V2H (vehicle-to-home) and V2L (vehicle-to-electric equipment), and also meet the requirements of direct current-to-direct current conversion, and the application scene is the function of V2V (vehicle-to-vehicle), and a circuit compatible with the reverse direct current conversion by high-power three-phase alternating current inversion is needed. In the conventional bidirectional charge-discharge equipment with the three-phase alternating current inversion compatible reverse direct current conversion function, a high-power bidirectional charge-discharge module is generally adopted to realize the functions of V2G, V H and V2L, and a high-voltage direct current conversion (DC-DC) module is additionally adopted to realize the function of V2V. In the application occasion of the high-power bidirectional charging pile, the circuit structure and equipment cost can be increased by adopting the collocation of a high-voltage direct current conversion (DC-DC) module in consideration of cost.
[ summary of the utility model ]
The utility model aims to solve the technical problem of providing an alternating current/direct current bidirectional conversion circuit of a charging pile with a V2V function, which has a simple structure and low cost.
In order to solve the technical problems, the technical scheme adopted by the utility model is that the alternating current/direct current bidirectional conversion circuit of the charging pile comprises a main circuit and a control circuit, wherein the main circuit comprises a three-phase PFC circuit, a DC/DC bidirectional conversion circuit and a V2V output circuit, and the direct current output end of the three-phase PFC circuit is connected with the positive input end of the DC/DC bidirectional conversion circuit through a direct current bus; the three-phase PFC circuit comprises three PFC inductors, and the V2V output circuit comprises an anode output pin, a cathode output pin, an output capacitor and two three-phase power relays; the input ends of the three PFC inductors are respectively connected with three pins of a three-phase power supply through three main contacts of a first three-phase power relay, and are connected with an anode output pin through three main contacts of a second three-phase power relay; two ends of the output capacitor are respectively connected with a positive electrode output pin and a negative electrode output pin; the control end of the first three-phase power relay and the control end of the second three-phase power relay are respectively connected with the control circuit.
The alternating current/direct current bidirectional conversion circuit of the charging pile comprises a three-phase alternating current/direct current bidirectional conversion circuit, and the output ends of the three PFC inductors are respectively connected with three alternating current ends of the three-phase alternating current/direct current bidirectional conversion circuit; the direct current end of the three-phase AC/DC bidirectional conversion circuit is connected with the positive input end of the DC/DC bidirectional conversion circuit through a direct current bus and a bus capacitor.
The alternating current/direct current bidirectional conversion circuit of the charging pile comprises an EMI filter circuit, and three main contacts of the first three-phase power relay are respectively connected with three pins of a three-phase power supply through the EMI filter circuit.
The alternating current/direct current bidirectional conversion circuit of the charging pile comprises a three-phase alternating current/direct current bidirectional conversion circuit, a three-phase full-bridge rectification circuit and a three-phase inversion circuit, wherein the three-phase alternating current/direct current bidirectional conversion circuit is forward-connected to the controllable three-phase full-bridge rectification circuit, and the three-phase alternating current/direct current bidirectional conversion circuit is reverse-connected to the three-phase inversion circuit, and comprises 6 MOS (metal oxide semiconductor) tubes which are respectively connected to three upper bridge arms and three lower bridge arms of the controllable three-phase full-bridge rectification circuit; the midpoints of three bridge arms of the controllable three-phase full-bridge rectification circuit are used as three alternating current ends of the three-phase AC/DC bidirectional conversion circuit and are respectively connected with the output ends of three PFC inductors; three upper bridge arms of the controllable three-phase full-bridge rectifying circuit are connected with direct current positive buses, and three lower bridge arms of the controllable three-phase full-bridge rectifying circuit are connected with direct current negative buses.
The alternating current/direct current bidirectional conversion circuit of the charging pile is characterized in that the negative output pin of the V2V output circuit is connected with a direct current negative bus.
The V2V output circuit of the alternating current/direct current bidirectional conversion circuit of the charging pile realizes the output of the three-phase alternating current inversion compatible reverse direct current conversion by utilizing the switching of the two three-phase power relays, and has simple circuit structure and lower cost.
[ description of the drawings ]
The utility model will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a main circuit of an ac/dc bidirectional conversion circuit of a charging pile according to an embodiment of the present utility model.
Detailed description of the preferred embodiments
The alternating current/direct current bidirectional conversion circuit of the charging pile comprises a main circuit and a control circuit. The structure and principle of the main circuit are shown in fig. 1, and the main circuit comprises a three-phase PFC circuit, a DC/DC bidirectional conversion circuit and a V2V output circuit.
The three-phase PFC circuit comprises an EMI filter circuit, a three-phase AC/DC bidirectional conversion circuit and three PFC inductors L1, L2 and L3,
the three-phase AC/DC bidirectional conversion circuit is a controllable three-phase full-bridge rectification circuit in the forward direction and a three-phase inverter circuit in the reverse direction. The three-phase AC/DC bidirectional conversion circuit comprises 6 MOS tubes Q1, Q2, Q3, Q4, Q5 and Q6, and the 6 MOS tubes Q1, Q2, Q3, Q4, Q5 and Q6 are respectively connected to three upper bridge arms and three lower bridge arms of the controllable three-phase full-bridge rectification circuit. The midpoints of three bridge arms of the controllable three-phase full-bridge rectifying circuit are used as the three alternating current ends of the three-phase AC/DC bidirectional conversion circuit and are respectively connected with the second ends (output ends) of the three PFC inductors L1, L2 and L3. The three upper bridge arms of the controllable three-phase full-bridge rectifying circuit are connected with direct-current positive buses, the three lower bridge arms of the controllable three-phase full-bridge rectifying circuit are connected with direct-current negative buses, and bus capacitors are connected between the direct-current positive buses and the direct-current negative buses.
The forward direct current input end of the DC/DC bidirectional conversion circuit is connected with a direct current bus, and the forward direct current output end of the DC/DC bidirectional conversion circuit is connected with a power battery of the electric automobile.
The V2V output circuit comprises an anode output pin Vc+, a cathode output pin Vc-, an output capacitor and two three-phase magnetic latching power relays. The first three-phase magnetic latching power relay is an alternating current input/output relay, and the second three-phase magnetic latching power relay is a reverse direct current output relay.
The first ends (input ends) of the three PFC inductors L1, L2 and L3 are respectively connected with three main contacts K4, K5 and K6 of the first three-phase magnetic latching power relay, and the three main contacts K4, K5 and K6 of the first three-phase magnetic latching power relay are respectively connected with three pins U, V and W of a three-phase power supply through an EMI filter circuit. The first ends (input ends) of the three PFC inductors L1, L2 and L3 are respectively connected with an anode output pin Vc+ through three main contacts K1, K2 and K3 of the second three-phase magnetic latching power relay. The control end of the first three-phase magnetic latching power relay and the control end of the second three-phase magnetic latching power relay are respectively connected with a control circuit.
The output capacitor is formed by connecting an electrolytic capacitor C1 and an electrolytic capacitor C2 in series, and two ends of the output capacitor are respectively connected with an anode output pin Vc+ and a cathode output pin Vc-of the V2V output circuit. Negative electrode output pin Vc-of V2V output circuit connects direct current negative bus.
The alternating current/direct current bidirectional conversion circuit of the charging pile provided by the embodiment of the utility model has the following working processes:
in rectification mode (AC-DC): three-phase alternating current input and output relays (K4, K5 and K6) are closed, three-phase reverse direct current output relays (K1, K2 and K4) are opened, three-phase alternating current is boosted and rectified by a PFC circuit and then a DC/DC conversion circuit is used for obtaining a required voltage value to charge a battery of the electric automobile.
In three-phase inversion mode (DC-AC): the three-phase alternating current input and output relays (K4, K5 and K6) are closed, the three-phase reverse direct current output relays (K1, K2 and K4) are opened, and the battery voltage is converted by DC-DC and then is reversed by the PFC circuit, so that the three-phase alternating current is obtained, and the discharging function of the battery to a power grid or three-phase alternating current electric equipment is realized.
At the time of reverse direct current conversion (DC-DC): three-phase alternating current input and output relays (K4, K5 and K6) are disconnected, three-phase reverse direct current output relays (K1, K2 and K3) are closed, battery voltage passes through a DC/DC conversion circuit and then passes through a PFC circuit, MOS transistors Q1 and Q4 are controlled to be opened and closed through a DSP, and at the moment, a voltage reduction circuit (BUCK circuit) is formed by the Q1, the Q4 and a PFC inductor L1. Similarly, the MOS tubes Q2, Q5 and the PFC inductor L2, the MOS tubes Q3, Q6 and the PFC inductor L3 form another two BUCK circuits (BUCK circuits), three BUCK circuits are formed in total, the MOS tubes of the three staggered parallel BUCK circuits are controlled by the DSP to control output direct current voltage, the three-phase reverse direct current output relays (K1, K2 and K3) are connected in parallel and filtered by the output capacitors (C1 and C2) to obtain the required direct current voltage, and the conversion from reverse direct current to direct current can be realized through the positive and negative output pins Vc+ and Vc-output of the V2V output circuit, so that the realization of the V2V function is satisfied.
According to the alternating current/direct current bidirectional conversion circuit, a simple V2V output circuit is added on a charging circuit with V2G, V H and V2L functions, and cost and space are greatly saved for adding the V2V functions. The three-phase alternating current inversion or the reverse direct current conversion is realized by controlling the switching of the two three-phase magnetic latching power relays and the reverse control of the PFC and DC/DC bidirectional conversion circuit.
In the conventional ac/dc bidirectional conversion circuit of the charging pile, a bidirectional charging pile module and a high-voltage dc conversion module are generally used. In the above embodiment of the utility model, in order to simplify the system structure of the bidirectional charge and discharge device and save the product cost, and more effectively utilize the product space, when the battery is discharged (i.e. when the battery is reversed), a step-down circuit (BUCK circuit) is formed when each phase of PFC circuit is reversed, two three-phase magnetic latching power relays are connected in front of the three-phase PFC inductor, and the switching of the three-phase magnetic latching power relays is controlled by the DSP to control the three BUCK circuits to be connected and filtered by the electrolytic capacitor to form a direct current output positive (dc+). Therefore, the bidirectional charging pile module compatible with reverse direct current conversion by using only one three-phase alternating current inversion can realize the functions of alternating current to direct current (AC-DC), direct current to alternating current (DC-AC) and reverse direct current to direct current (DC-DC) conversion. A high-voltage direct-current conversion module is saved, and the product cost is greatly reduced.
Claims (5)
1. The alternating current/direct current bidirectional conversion circuit of the charging pile comprises a main circuit and a control circuit, wherein the main circuit comprises a three-phase PFC circuit and a DC/DC bidirectional conversion circuit, and a direct current output end of the three-phase PFC circuit is connected with a positive input end of the DC/DC bidirectional conversion circuit through a direct current bus; the three-phase PFC circuit comprises three PFC inductors and is characterized by comprising a V2V output circuit, wherein the V2V output circuit comprises an anode output pin, a cathode output pin, an output capacitor and two three-phase power relays; the input ends of the three PFC inductors are respectively connected with three pins of a three-phase power supply through three main contacts of a first three-phase power relay, and are connected with an anode output pin through three main contacts of a second three-phase power relay; two ends of the output capacitor are respectively connected with a positive electrode output pin and a negative electrode output pin; the control end of the first three-phase power relay and the control end of the second three-phase power relay are respectively connected with the control circuit.
2. The alternating current/direct current bidirectional conversion circuit of the charging pile according to claim 1, wherein the three-phase PFC circuit comprises a three-phase AC/DC bidirectional conversion circuit, and the output ends of the three PFC inductors are respectively connected with three alternating current ends of the three-phase AC/DC bidirectional conversion circuit; the direct current end of the three-phase AC/DC bidirectional conversion circuit is connected with the positive input end of the DC/DC bidirectional conversion circuit through a direct current bus and a bus capacitor.
3. The ac/dc bi-directional conversion circuit of a charging post according to claim 1, wherein the three-phase PFC circuit comprises an EMI filter circuit, and three main contacts of the first three-phase power relay are connected to three pins of the three-phase power supply through the EMI filter circuit, respectively.
4. The alternating current/direct current bidirectional conversion circuit of the charging pile according to claim 2, wherein the three-phase alternating current/direct current bidirectional conversion circuit is a controllable three-phase full-bridge rectification circuit in the forward direction and a three-phase inverter circuit in the reverse direction, and comprises 6 MOS tubes, wherein the 6 MOS tubes are respectively connected to three upper bridge arms and three lower bridge arms of the controllable three-phase full-bridge rectification circuit, and the midpoints of the three bridge arms of the controllable three-phase full-bridge rectification circuit are respectively connected with the output ends of three PFC inductors as three alternating current ends of the three-phase alternating current/direct current bidirectional conversion circuit; three upper bridge arms of the controllable three-phase full-bridge rectifying circuit are connected with direct current positive buses, and three lower bridge arms of the controllable three-phase full-bridge rectifying circuit are connected with direct current negative buses.
5. The ac/dc bi-directional conversion circuit of a charging post according to claim 4, wherein the negative output pin of the V2V output circuit is connected to a dc negative bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321156494.3U CN220022645U (en) | 2023-05-15 | 2023-05-15 | Alternating current/direct current bidirectional conversion circuit of charging pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321156494.3U CN220022645U (en) | 2023-05-15 | 2023-05-15 | Alternating current/direct current bidirectional conversion circuit of charging pile |
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| Publication Number | Publication Date |
|---|---|
| CN220022645U true CN220022645U (en) | 2023-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321156494.3U Active CN220022645U (en) | 2023-05-15 | 2023-05-15 | Alternating current/direct current bidirectional conversion circuit of charging pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220022645U (en) |
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2023
- 2023-05-15 CN CN202321156494.3U patent/CN220022645U/en active Active
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