Charging power supply circuit and charging pile for electric vehicles

Abstract

The present application discloses a charging power supply circuit and a charging pile for an electric vehicle, which are applied to the technical field of electric vehicle charging and are used to improve the safety of vehicle charging. The charging power supply circuit for an electric vehicle provided by the present application comprises a phase line of alternating current, a first voltage control unit, a second voltage control unit, a current conductor and a switch control unit, a switch is provided on the phase line, the first voltage control unit is respectively connected to the working power supply of the power supply circuit and the charging gun of an external vehicle, the output end of the first voltage control unit is connected to the first input end of the current conductor, the second voltage control unit is respectively connected to the working power supply of the power supply circuit and the charging gun of an external vehicle, the output end of the second voltage control unit is connected to the second input end of the current conductor; the output end of the current conductor is connected to the control end of the switch control unit, the output end of the switch control unit is connected to the switch, and the output end of the phase line connected to the switch forms the power output end of the power supply circuit.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle charging, and in particular to a charging power supply circuit and a charging pile for an electric vehicle. Background Art

[0002] With the rapid development of the electric vehicle industry at home and abroad, the market share of electric vehicles continues to increase. Charging equipment, as an indispensable infrastructure for the popularization of electric vehicles, has also received more and more attention. Low-cost, high-safety charging equipment is increasingly favored by the market.

[0003] In order to improve the safety of charging equipment, traditional methods are generally implemented through the following three methods:

[0004] (1) When connecting an electric vehicle to an AC power grid (power supply), a plug and socket that complies with the requirements of GB2099.1 and GB1002 is used on the power supply side, and a phase line, a neutral line and a grounding protective conductor are used on the power supply side.

[0005] (2) When connecting an electric vehicle to an AC power grid (power supply), a plug and socket that complies with the requirements of GB2099.1 and GB1002 is used on the power supply side, a phase line, a neutral line and a grounding conductor are used on the power supply side, and an in-cable control and protection device (IC-CPD) is used during charging connection.

[0006] (3) When connecting the electric vehicle to the AC power grid (power supply), a dedicated power supply device is used to directly connect the electric vehicle to the AC power grid, and a control and guidance device is installed on the dedicated power supply device.

[0007] The existing design (1) uses a three-core plug and a vehicle plug to connect the power grid and the electric vehicle, which can only serve as a conductor. When the three-core plug is plugged in, the vehicle plug is always energized, which is not safe enough. The existing designs (2) and (3) add a CP (Control Point) control guidance function, which mainly realizes the charging function by changing the voltage value of the control point CP, which greatly improves safety, but brings a significant increase in cost. Summary of the invention

[0008] The embodiments of the present application provide a charging power supply circuit and a charging pile for an electric vehicle to solve the technical problem that it is difficult to improve the safety of automobile charging on a low-cost basis.

[0009] According to one aspect of the present invention, a charging power supply circuit for an electric vehicle is provided, comprising a phase line of alternating current, a first voltage control unit, a second voltage control unit, a current conductor and a switch control unit, wherein a switch is provided on the phase line;

[0010] The first voltage control unit is connected to the working power supply of the power supply circuit and the charging gun of the external vehicle respectively, and the output end of the first voltage control unit is connected to the first input end of the current conductor, and is used to adjust the voltage input by the working power supply to a first divided voltage, and output a high level when the voltage input by the charging gun is greater than the first divided voltage;

[0011] The second voltage control unit is connected to the working power supply of the power supply circuit and the charging gun of the external vehicle respectively, and the output end of the second voltage control unit is connected to the second input end of the current conductor, and is used to adjust the voltage input by the working power supply to a second divided voltage, and output a high level when the second divided voltage is greater than the voltage input by the charging gun;

[0012] The output end of the current conductor is connected to the control end of the switch control unit, and is used to turn on the switch control unit when receiving a high level input by the first voltage control unit and a high level input by the second control unit at the same time;

[0013] The output end of the switch control unit is connected to the switch, and is used to control the switch to be closed when the switch control unit is turned on;

[0014] The output end of the phase line connected to the switch forms the power output end of the power supply circuit.

[0015] According to another aspect of the present invention, a charging pile is provided, and the charging pile includes the above-mentioned charging power supply circuit for the electric vehicle.

[0016] The charging power supply circuit and charging pile of the electric vehicle provided by the present invention are provided with a switch control unit before the power output end, and the first voltage control unit and the second voltage control unit are provided to be connected to the working power supply of the power supply circuit and the charging gun of the external vehicle. Only when the charging gun of the external vehicle is connected to the charging power supply circuit of the electric vehicle, the long-voltage of the vehicle is transmitted to the first voltage control unit and the second voltage control unit of the charging power supply circuit of the electric vehicle through the charging gun, so that the first voltage control unit and the second voltage control unit both output a high level to turn on the current conductor, thereby turning on the switch control unit, so that the phase line for outputting charging power is turned on, so that only when the charging gun of the electric vehicle is connected to the power supply circuit, the phase line for providing power for charging the electric vehicle is turned on, and when the charging gun of the electric vehicle is not connected to the power supply circuit, the phase line for providing power for charging the electric vehicle is not turned on, so that the power supply plug is not energized. The present invention can improve the safety of electric vehicle charging through circuit design, with low cost and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 is a block diagram of a charging power supply circuit of an electric vehicle in one embodiment of the present application;

[0019] Figure 2 is a circuit diagram of a charging power supply circuit of an electric vehicle in one embodiment of the present application;

[0020] Figure 3 Schematic diagram of a circuit in a charging gun of an external vehicle in one embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] The implementation of this application is described in detail below with reference to the specific drawings:

[0023] Figure 1 This is a block diagram of a charging power supply circuit for an electric vehicle in an embodiment of the present application. Figure 1 A charging power supply circuit of an electric vehicle according to an embodiment of the present application is described in detail. Figure 1As shown, the charging power supply circuit of the electric vehicle includes a phase line of alternating current, and also includes a first voltage control unit 01, a second voltage control unit 02, a current conductor 03 and a switch control unit 04, and a switch is provided on the phase line;

[0024] The first voltage control unit 01 is connected to the working power supply of the power supply circuit and the charging gun of the external vehicle respectively, and the output end of the first voltage control unit 01 is connected to the first input end of the current conductor 03, and is used to adjust the voltage input by the working power supply to a first divided voltage, and output a high level when the voltage input by the charging gun is greater than the first divided voltage;

[0025] The second voltage control unit 02 is connected to the working power supply of the power supply circuit and the charging gun of the external vehicle respectively, and the output end of the second voltage control unit 02 is connected to the second input end of the current conductor 03, and is used to adjust the voltage input by the working power supply to a second divided voltage, and output a high level when the second divided voltage is greater than the voltage input by the charging gun;

[0026] The output end of the current conductor 03 is connected to the control end of the switch control unit 04, and is used to turn on the switch control unit 04 when receiving the high level input by the first voltage control unit 01 and the high level input by the second control unit at the same time;

[0027] The output end of the switch control unit 04 is connected to the switch, and is used to control the switch to be closed when the switch control unit 04 is turned on;

[0028] The output end of the phase line connected to the switch forms the power output end of the power supply circuit.

[0029] In one embodiment, the phase line may be a live line of a 220V AC power grid. When the charging power source is an engine generator or other multi-phase AC power source, the phase line may also be each phase line in the multi-phase AC power.

[0030] Furthermore, when this embodiment is applied to the charging power source as engine power generation or other multi-phase AC power sources, for example, when applied to two-phase, three-phase, five-phase and other AC power, the charging power supply circuit of the electric vehicle is deployed on each phase line of the AC power, and the first voltage control unit and the second voltage control unit in the charging power supply circuit of the electric vehicle deployed on the phase line are both connected to the charging gun of the external vehicle.

[0031] The charging power supply circuit of the electric vehicle provided in this embodiment is provided with a switch control unit before the power output end, and the first voltage control unit and the second voltage control unit are both connected to the working power supply of the power supply circuit and the charging gun of the external vehicle. Only when the charging gun of the external vehicle is connected to the charging power supply circuit of the electric vehicle, the long-voltage of the vehicle is transmitted to the first voltage control unit and the second voltage control unit of the charging power supply circuit of the electric vehicle through the charging gun, so that the first voltage control unit and the second voltage control unit both output a high level to turn on the current conductor, thereby turning on the switch control unit, so that the phase line for outputting charging power is turned on, so that only when the charging gun of the electric vehicle is connected to the power supply circuit, the phase line for providing power for charging the electric vehicle is turned on, and when the charging gun of the electric vehicle is not connected to the power supply circuit, the phase line for providing power for charging the electric vehicle is not turned on, so that the power supply plug is not energized. This embodiment can improve the safety of electric vehicle charging through circuit design, with low cost and high safety.

[0032] Figure 2 is a circuit diagram of a charging power supply circuit of an electric vehicle in one embodiment of the present application, such as Figure 2 As shown, as an option, the first voltage control unit 01 includes a first operational amplifier and a first voltage dividing resistor;

[0033] The first voltage-dividing resistor is connected to the working power supply of the power supply circuit and the inverting input terminal of the first operational amplifier respectively, and is used to adjust the voltage input by the working power supply to the first divided voltage;

[0034] The first operational amplifier is provided with an offset voltage adjustment terminal, the offset voltage adjustment terminal of the first operational amplifier is connected to the working power supply of the power supply circuit, the non-phase input terminal of the first operational amplifier is connected to the charging gun of the external vehicle, and the output terminal of the first operational amplifier forms the output terminal of the first voltage control unit 01.

[0035] In one embodiment, Figure 2 As shown, Figure 2 The VCC voltage in represents the working voltage of the charging power supply circuit of the electric vehicle. The working voltage of the power supply circuit can be obtained by converting the voltage output by the AC power grid. The voltage value of the working voltage of the power supply circuit is preferably 5V. Figure 2 The CC voltage in the figure represents the voltage input by the charging gun of the external vehicle, which is obtained by converting the long-distance power of the external vehicle to be charged. The long-distance power voltage of the external vehicle can be amplified to obtain the CC voltage.

[0036] The first voltage-dividing resistor includes a resistor R1 and a resistor R2, one end of the resistor R1 is connected to the working power supply of the power supply circuit, one end of the resistor R2 is grounded, and the other end of the resistor R1, the other end of the resistor R2 and the inverting input end of the first operational amplifier are connected in common. Figure 2 As shown, pin 2 of the first operational amplifier represents the inverting input terminal of the first operational amplifier, pin 3 of the first operational amplifier represents the non-inverting input terminal of the first operational amplifier, pin 4 and pin 8 of the first operational amplifier are offset voltage adjustment terminals of the first operational amplifier, and pin 8 represents the output terminal of the first operational amplifier.

[0037] In one embodiment, the first operational amplifier may be an operational amplifier of model OP4A.

[0038] In one embodiment, the second voltage control unit 02 includes a second operational amplifier and a second voltage dividing resistor;

[0039] The second voltage-dividing resistor is connected to the working power supply of the power supply circuit and the non-phase input terminal of the second operational amplifier respectively, and is used to adjust the voltage input by the working power supply to the second divided voltage;

[0040] The inverting input terminal of the second operational amplifier is connected to the charging gun of the external vehicle, and the output terminal of the second operational amplifier forms the output terminal of the second voltage control unit 02 .

[0041] In one embodiment, the second operational amplifier can be an operational amplifier of model OP3B. Figure 2 As shown, pin 5 of the second operational amplifier represents the non-inverting input terminal of the second operational amplifier, pin 6 represents the inverting input terminal of the second operational amplifier, and pin 7 represents the output terminal of the second operational amplifier.

[0042] like Figure 2 As shown, in one embodiment, the second voltage-dividing resistor includes a resistor R3 and a resistor R4, one end of the resistor R3 is connected to the working power supply of the power supply circuit, one end of the resistor R4 is grounded, and the other end of the resistor R3, the other end of the resistor R4 and the non-inverting input terminal of the second operational amplifier are connected in common.

[0043] In one embodiment, the current conductor 03 includes a first diode D1 and a second diode D2, the cathode of the first diode D1 is connected to the output end of the first voltage control unit 01, the cathode of the second diode D2 is connected to the output end of the second voltage control unit 02, and the anode of the first diode D1 and the anode of the second diode D2 are connected together to form the output end of the current conductor 03.

[0044] In one embodiment, Figure 2 As shown, the switch control unit 04 includes a transistor Q1, a resistor R5, a resistor R6 and a relay. One end of the resistor R5 is connected to the working power supply of the power supply circuit, one end of the resistor R6 is grounded, the other end of the resistor R5 and the other end of the resistor R6 are connected together to form a common node, and the common node forms the input end of the switch control unit 04. The common node is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to one end of the coil of the relay, and the other end of the coil of the relay is connected to the working power supply of the power supply circuit, the emitter of the transistor Q1 is connected to the other end of the resistor R6 and is grounded, and the contact K1 of the relay is arranged on the phase line to form the switch.

[0045] In one embodiment, the transistor Q1 is an NPN transistor.

[0046] In one embodiment, the phase line includes a live line or a phase line of a multi-phase alternating current.

[0047] According to another embodiment of the present application, a charging pile is provided, which includes the above-mentioned charging power supply circuit for the electric vehicle.

[0048] Figure 3 : is a schematic diagram of a circuit in a charging gun of an external vehicle in an embodiment. According to a usage scenario of this embodiment, Figure 2 and Figure 3 As shown, the charging gun used to charge the electric vehicle outputs a voltage CC, which is amplified by the long voltage of the electric vehicle to be charged, such as Figure 3 As shown, the voltage CC is the sum of the voltage of the resistor R9 and the voltage of the resistor RC. When the charging gun of the electric vehicle to be charged is inserted into the charging pile, the voltage CC output by the charging gun is simultaneously input to the first operational amplifier of the first voltage control unit 01 and the second operational amplifier of the second voltage control unit 02. By setting the resistance values ​​of the resistors R1, R2, R3 and R4, the voltage division of the resistors R1 and R2 is less than the voltage division of the resistors RC and R9, and the voltage division of the resistors R3 and R4 is greater than the voltage division of the resistors RC and R9, so that the first operational amplifier and the second operational amplifier simultaneously output high level, the first diode D1 and the second diode D2 are simultaneously reversely broken down so that the transistor Q1 is turned on, so that the coil of the relay is energized, so that the normally open contact of the relay is closed, so that the power output end of the power supply circuit is energized.

[0049] The charging power supply circuit of the electric vehicle provided in the present embodiment is provided with a switch control unit before the power output end, and the first voltage control unit and the second voltage control unit are both connected to the working power supply of the power supply circuit and the charging gun of the external vehicle. Only when the charging gun of the external vehicle is connected to the charging power supply circuit of the electric vehicle, the long-voltage of the vehicle is transmitted to the first voltage control unit and the second voltage control unit of the charging power supply circuit of the electric vehicle through the charging gun, so that the first voltage control unit and the second voltage control unit both output a high level to turn on the current conductor, thereby turning on the switch control unit, so that the phase line for outputting charging power is turned on, so that only when the charging gun of the electric vehicle is connected to the power supply circuit, the phase line for providing power to the electric vehicle is turned on, and when the charging gun of the electric vehicle is not connected to the power supply circuit, the phase line for providing power to the electric vehicle is not turned on, so that the power supply plug is not energized. The present invention can improve the safety of electric vehicle charging through circuit design, with low cost and high safety.

[0050] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0051] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A charging power supply circuit for an electric vehicle, comprising a phase line of an alternating current, characterized in that: It also includes a first voltage control unit, a second voltage control unit, a current conductor and a switch control unit, and a switch is provided on the phase line; The first voltage control unit is connected to the working power supply of the power supply circuit and the charging gun of the external vehicle respectively, and the output end of the first voltage control unit is connected to the first input end of the current conductor, and is used to adjust the voltage input by the working power supply to a first divided voltage, and output a high level when the voltage input by the charging gun is greater than the first divided voltage; The second voltage control unit is connected to the working power supply of the power supply circuit and the charging gun of the external vehicle respectively, and the output end of the second voltage control unit is connected to the second input end of the current conductor, and is used to adjust the voltage input by the working power supply to a second divided voltage, and output a high level when the second divided voltage is greater than the voltage input by the charging gun; The output end of the current conductor is connected to the control end of the switch control unit, and is used to turn on the switch control unit when receiving a high level input by the first voltage control unit and a high level input by the second voltage control unit at the same time; The output end of the switch control unit is connected to the switch, and is used to control the switch to be closed when the switch control unit is turned on; The output end of the phase line connected to the switch forms the power output end of the power supply circuit; The first voltage control unit includes a first operational amplifier and a first voltage dividing resistor; The first voltage-dividing resistor is connected to the working power supply of the power supply circuit and the inverting input terminal of the first operational amplifier respectively, and is used to adjust the voltage input by the working power supply to the first divided voltage; The first operational amplifier is provided with an offset voltage adjustment terminal, the offset voltage adjustment terminal of the first operational amplifier is connected to the working power supply of the power supply circuit, the non-inverting input terminal of the first operational amplifier is connected to the charging gun of the external vehicle, and the output terminal of the first operational amplifier forms the output terminal of the first voltage control unit; the second voltage control unit includes a second operational amplifier and a second voltage dividing resistor; The second voltage-dividing resistor is connected to the working power supply of the power supply circuit and the non-inverting input terminal of the second operational amplifier respectively, and is used to adjust the voltage input by the working power supply to the second divided voltage; An inverting input terminal of the second operational amplifier is connected to a charging gun of the external vehicle, and an output terminal of the second operational amplifier forms an output terminal of the second voltage control unit.

2. The charging power supply circuit of the electric vehicle according to claim 1, characterized in that: The first voltage-dividing resistor includes a resistor R1 and a resistor R2, one end of the resistor R1 is connected to the working power supply of the power supply circuit, one end of the resistor R2 is grounded, and the other end of the resistor R1, the other end of the resistor R2 and the inverting input end of the first operational amplifier are connected in common.

3. The charging power supply circuit of the electric vehicle according to claim 1, characterized in that: The second voltage-dividing resistor includes a resistor R3 and a resistor R4, one end of the resistor R3 is connected to the working power supply of the power supply circuit, one end of the resistor R4 is grounded, and the other end of the resistor R3, the other end of the resistor R4 and the non-inverting input end of the second operational amplifier are connected in common.

4. The charging power supply circuit of the electric vehicle according to claim 1, characterized in that: The current conductor includes a first diode and a second diode, the cathode of the first diode is connected to the output end of the first voltage control unit, the cathode of the second diode is connected to the output end of the second voltage control unit, and the anode of the first diode and the anode of the second diode are connected together to form the output end of the current conductor.

5. The charging power supply circuit of the electric vehicle according to claim 1, characterized in that: The switch control unit includes a transistor, a resistor R5, a resistor R6 and a relay. One end of the resistor R5 is connected to the working power supply of the power supply circuit, one end of the resistor R6 is grounded, the other end of the resistor R5 and the other end of the resistor R6 are connected together to form a common node, and the common node forms the input end of the switch control unit. The common node is connected to the base of the transistor, the collector of the transistor is connected to one end of the coil of the relay, the other end of the coil of the relay is connected to the working power supply of the power supply circuit, the emitter of the transistor and the other end of the resistor R6 are connected together and grounded, and the contacts of the relay are arranged on the phase line to form the switch.

6. The charging power supply circuit of the electric vehicle according to claim 5, characterized in that: The transistor is an NPN transistor.

7. The charging power supply circuit of an electric vehicle according to any one of claims 1 to 6, characterized in that: The phase line includes a live line or a phase line of a multi-phase alternating current.

8. A charging pile, characterized in that: The charging pile comprises a charging power supply circuit for an electric vehicle as claimed in any one of claims 1 to 7.

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