Charging standard switching circuit and charging pile control panel

Abstract

The utility model provides a charging standard switching circuit and a charging pile control panel, the charging standard switching circuit comprises a signal switching circuit, a signal acquisition circuit and a signal processing circuit, the signal switching circuit comprises a first resistance value switching unit and a second resistance value switching unit; wherein the signal switching circuit is used for providing any one output resistance value in at least three output resistance values. A voltage signal at a charging interface is acquired through the signal acquisition circuit, and after the voltage signal is judged and processed through the signal processing circuit, different output resistance values are output by controlling the signal switching circuit to adapt to resistance values of different charging standards and realize switching of the different charging standards, so that compatibility of multiple charging standards is realized; and the universality of the charging pile is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle charging technology, and in particular to a charging standard switching circuit and a charging pile control board. Background Technology

[0002] With the increasing popularity of electric vehicles, the construction of charging infrastructure is also becoming more and more comprehensive. Currently, there are various electric vehicle charging standards on the market, such as GB2015, GB2015+, and ChaoJi. Different charging standards have different definitions for the connection confirmation signal CC1. Therefore, different control and guidance circuits are usually required for different charging standards, which means that each charging station can only independently support one standard.

[0003] Currently, most new energy vehicles are designed based on GB2015, and most DC charging pile controllers and charging guns are also designed based on GB2015. However, with the implementation of GB2015+ and ChaoJi, charging piles that can only support a single standard type will not meet user needs. Therefore, it is necessary to improve the compatibility of charging piles to enhance their universality. Utility Model Content

[0004] This invention provides a charging standard switching circuit and a charging pile control board, aiming to solve the problem that charging piles in related technologies can only support a single type of charging standard and have poor versatility.

[0005] To address the aforementioned technical problems, the present invention provides a charging standard switching circuit, comprising: a signal switching circuit, a signal acquisition circuit, and a signal processing circuit. The signal switching circuit includes a first resistance switching unit and a second resistance switching unit. The signal switching circuit is used to provide any one of at least three output resistance values. The first resistance switching unit is electrically connected to a power supply and the second resistance switching unit, respectively. The second resistance switching unit is also electrically connected to an external vehicle-side CC1 interface. The signal processing circuit is electrically connected to the first resistance switching unit, the second resistance switching unit, and the signal acquisition circuit, respectively. The signal acquisition circuit is also electrically connected to the CC1 interface.

[0006] Furthermore, the first resistance switching unit includes a first resistor, a second resistor, and a first switching device; the first ends of the first resistor and the second resistor are both electrically connected to the power supply, the second end of the first resistor is electrically connected to the first end of the first switching device, the second end of the second resistor is electrically connected to the second end of the first switching device and the second resistance switching unit, and the third end of the first switching device is electrically connected to the signal processing circuit.

[0007] Furthermore, the second resistance switching unit includes a third resistor, a fourth resistor, a second switching device, and a third switching device; the first terminals of the second switching device, the third switching device, and the third resistor are all electrically connected to the first resistance switching unit, the second terminal of the second switching device is electrically connected to the first terminal of the fourth resistor, the second terminals of the third resistor, the fourth resistor, and the third switching device are all used for electrical connection to the CC1 interface, and the third terminals of the second switching device and the third switching device are all electrically connected to the signal processing circuit.

[0008] Furthermore, the first switching device, the second switching device, and the third switching device each include any one of the following: a single-pole single-throw relay, or a MOSFET.

[0009] Furthermore, the first resistance switching unit includes a fifth resistor, a sixth resistor, and a double-pole double-throw (DPDT) switch; the first ends of the fifth resistor and the sixth resistor are both electrically connected to the power supply; the second end of the fifth resistor is electrically connected to the first end of the DPDT switch and the second resistance switching unit, respectively; the second end of the sixth resistor is electrically connected to the second end of the DPDT switch; the third and fourth ends of the DPDT switch are both electrically connected to the second resistance switching unit; and the fifth end of the DPDT switch is electrically connected to the signal processing circuit.

[0010] Furthermore, the second resistance switching unit includes a seventh resistor, an eighth resistor, and a fourth switching device; the first end of the seventh resistor is electrically connected to the first end of the fourth switching device, the third and fourth ends of the double-pole double-throw switch, and the second end of the fifth resistor, respectively; the first end of the eighth resistor is electrically connected to the third and fourth ends of the double-pole double-throw switch; the second ends of the seventh resistor, the eighth resistor, and the fourth switching device are all used to electrically connect to the CC1 interface; and the third end of the fourth switching device is electrically connected to the signal processing circuit.

[0011] Furthermore, the signal acquisition circuit includes a resistor voltage divider circuit, the first end of which is electrically connected to the CC1 interface, the second end of which is electrically connected to the signal processing circuit, and the third end of which is grounded.

[0012] Furthermore, the resistor voltage divider circuit includes a ninth resistor and a tenth resistor. One end of the ninth resistor is used to be electrically connected to the CC1 interface, and one end of the tenth resistor is electrically connected to the other end of the ninth resistor and the signal processing circuit. The other end of the tenth resistor is grounded.

[0013] Furthermore, the signal processing circuit includes a controller and an isolation operational amplifier circuit. The isolation operational amplifier circuit is electrically connected to the signal acquisition circuit and the controller, respectively. The controller is also electrically connected to the first resistance switching unit and the second resistance switching unit, respectively.

[0014] The second aspect of this utility model provides a charging pile control board, including the charging standard switching circuit as described in the first aspect of this utility model.

[0015] As can be seen from the above description, this utility model acquires the voltage signal at the charging interface through a signal acquisition circuit, and after the signal processing circuit judges and processes it, it outputs different output resistance values ​​through a control signal switching circuit to adapt to the resistance values ​​of different charging standards, thereby realizing the switching of different charging standards, thus achieving compatibility of multiple charging standards and improving the versatility of charging piles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a charging standard switching circuit according to an embodiment of the present invention;

[0017] Figure 2 This is a circuit diagram of the first signal switching circuit according to an embodiment of the present utility model;

[0018] Figure 3 This is a circuit diagram of the second signal switching circuit according to an embodiment of the present invention;

[0019] Figure 4 This is a circuit diagram of a signal acquisition circuit and a signal processing circuit according to an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] In related technologies, charging piles only support a single type of charging standard, resulting in poor versatility. Therefore, this utility model embodiment provides a charging standard switching circuit.

[0022] like Figure 1The diagram shows a schematic of a charging standard switching circuit according to an embodiment of the present invention. The charging standard switching circuit includes a signal switching circuit 100, a signal acquisition circuit 200, and a signal processing circuit 300. The signal switching circuit 100 includes a first resistance switching unit 110 and a second resistance switching unit 120. The signal switching circuit 100 is used to provide any one of at least three output resistance values. The first resistance switching unit 110 is electrically connected to the power supply and the second resistance switching unit 120, respectively. The second resistance switching unit 120 is also used to be electrically connected to the CC1 interface of the external vehicle terminal 400. The signal processing circuit 300 is electrically connected to the first resistance switching unit 110, the second resistance switching unit 120, and the signal acquisition circuit 200, respectively. The signal acquisition circuit 200 is also used to be electrically connected to the CC1 interface.

[0023] Specifically, in this embodiment, the signal switching unit provides at least three output resistance values. The signal switching unit includes a first resistance value switching unit 110 and a second resistance value switching unit 120. The first and second resistance value switching units allow switching between different output resistance values ​​to select one for output. Different output resistance values ​​result in different output voltage signals, which are equivalent to resistance values ​​in different charging standards. This adapts to different charging standards, enabling compatibility and switching between multiple charging standards. The signal acquisition circuit 200 acquires the voltage signal from the CC1 interface of the charging interface at the vehicle end 400 and transmits it to the signal processing circuit 300 for judgment and processing. This determines the charging standard corresponding to the charging gun and the vehicle end 400, thereby controlling the signal switching circuit 100 to switch between different output resistance values, achieving switching between different charging standards, improving the versatility of the charging pile and the user experience.

[0024] like Figure 2 The diagram shown is a schematic of the first signal switching circuit provided in this embodiment. Please refer to [link / reference]. Figure 1 and Figure 2 The first resistance switching unit 110 includes a first resistor R1, a second resistor R2, and a first switching device K1. The first ends of the first resistor R1 and the second resistor R2 are both electrically connected to the power supply. The second end of the first resistor R1 is electrically connected to the first end of the first switching device K1. The second end of the second resistor R2 is electrically connected to the second end of the first switching device K1 and the second resistance switching unit 120, respectively. The third end of the first switching device K1 is electrically connected to the signal processing circuit 300.

[0025] Furthermore, please see Figure 2The second resistance switching unit 120 includes a third resistor R3, a fourth resistor R4, a second switching device K2, and a third switching device K3. The first ends of the second switching device K2, the third switching device K3, and the third resistor R3 are all electrically connected to the first resistance switching unit 110. The second end of the second switching device K2 is electrically connected to the first end of the fourth resistor R4. The second ends of the third resistor R3, the fourth resistor R4, and the third switching device K3 are all used to electrically connect to the CC1 interface. The third ends of the second switching device K2 and the third switching device K3 are all electrically connected to the signal processing circuit 300.

[0026] The first switching device K1, the second switching device K2 and the third switching device K3 each include any one of the following: a single-pole single-throw relay and a MOSFET.

[0027] Specifically, in this embodiment, the first resistance switching unit 110 and the second resistance switching unit 120 can be combined to achieve switching of multiple resistance values. When the switching devices in both resistance switching units are independent switching devices, the first resistance switching unit 110 can provide two resistance values, and the second resistance switching unit 120 can provide three resistance values, ultimately achieving switching of six resistance values. The two resistors in the first resistance switching unit 110 have equal resistance values, for example, both 2KΩ, which is equivalent to resistor R1 in the GB2015, GB2015+, and ChaoJi standards. The third resistor R3 and the fourth resistor R4 in the second resistance switching unit 120 can be equivalent to resistor R2' in the GB2015+ standard or resistor R1' in the ChaoJi standard. The resistance value of the third resistor R3 can be 10KΩ, and the resistance value of the fourth resistor R4 can be 4.3KΩ. The resistance value of resistor R1 in the charging standard can be changed by the first switching device K1, and the resistance value of resistor R2' or resistor R1' in the charging standard can be changed by the first switching device K1 and the third switching device K3.

[0028] like Figure 3 The diagram shown is a schematic of the second signal switching circuit 100 provided in this embodiment. Please refer to [link / reference]. Figure 3 The first resistance switching unit 110 includes a fifth resistor R2, a sixth resistor R1, and a double-pole double-throw switch S1. The first ends of the fifth resistor R2 and the sixth resistor R1 are both electrically connected to the power supply. The second end of the fifth resistor R2 is electrically connected to the first end of the double-pole double-throw switch S1 and the second resistance switching unit 120, respectively. The second end of the sixth resistor R1 is electrically connected to the second end of the double-pole double-throw switch S1, respectively. The third and fourth ends of the double-pole double-throw switch S1 are both electrically connected to the second resistance switching unit 120. The fifth end of the double-pole double-throw switch S1 is electrically connected to the signal processing circuit 300.

[0029] Furthermore, please see Figure 3The second resistance switching unit 120 includes a seventh resistor R3, an eighth resistor R4, and a fourth switching device K3. The first end of the seventh resistor R3 is electrically connected to the first end of the fourth switching device K3, the third and fourth ends of the double-pole double-throw switch S1, and the second end of the fifth resistor R2. The first end of the eighth resistor R4 is electrically connected to the third and fourth ends of the double-pole double-throw switch S1. The second ends of the seventh resistor R3, the eighth resistor R4, and the fourth switching device K3 are all used to electrically connect to the CC1 interface. The third end of the fourth switching device K3 is electrically connected to the signal processing circuit 300.

[0030] Specifically, in this embodiment, with Figure 2 Unlike the signal switching circuit 100, the first switching device K1 and the second switching device K2 in the first resistance switching unit 110 and the second resistance switching unit 120 can be replaced by a double-pole double-throw switch S1, for example, by using a double-pole double-throw relay. This connection method can reduce the number of devices and control signals, further improve the stability and simplicity of the circuit, and save device costs.

[0031] like Figure 4 The diagram shown is a circuit schematic of a signal acquisition circuit and a signal processing circuit provided in this embodiment. Please refer to [link / reference]. Figure 1 and Figure 4 The signal acquisition circuit 200 includes a resistor voltage divider circuit 210. The first end of the resistor voltage divider circuit 210 is electrically connected to the CC1 interface, the second end of the resistor voltage divider circuit 210 is electrically connected to the signal processing circuit 300, and the third end of the resistor voltage divider circuit 210 is grounded.

[0032] Further, please see Figure 4 The resistor voltage divider circuit 210 includes a ninth resistor R5 and a tenth resistor R6. One end of the ninth resistor R5 is used to be electrically connected to the CC1 interface, and one end of the tenth resistor R6 is electrically connected to the other end of the ninth resistor R5 and the signal processing circuit 300. The other end of the tenth resistor R6 is grounded.

[0033] Specifically, in this embodiment, the signal acquisition circuit 200 can use a resistor voltage divider circuit 210 to acquire the voltage of the CC1 charging interface. The resistor voltage divider circuit 210 can be implemented by dividing the voltage using two resistance values. When the charging gun is connected to the vehicle end 400, the signal switching circuit 100 is in the default state, for example, switch K1 is open and switch K3 is closed. At this time, the state of switch K2 will not affect the output resistance value, and it can be opened or closed. At this time, the signal acquisition circuit 200 acquires the first voltage signal V1. The external vehicle seat or gun seat selects different charging standards through buttons or other means, causing the resistance value at the charging interface to change. At this time, the signal acquisition circuit 200 acquires the second voltage signal V2 and transmits the first voltage signal V1 and the second voltage signal V2 to the signal processing circuit 300.

[0034] Further, please see Figure 1 and Figure 4 The signal processing circuit 300 includes a controller 310 and an isolation operational amplifier circuit 320. The isolation operational amplifier circuit 320 is electrically connected to the signal acquisition circuit 200 and the controller 310 respectively. The controller 310 is also electrically connected to the first resistance switching unit 110 and the second resistance switching unit 120 respectively.

[0035] Specifically, in this embodiment, the signal processing circuit 300 includes a controller 310 and an isolation operational amplifier circuit 320. The controller 310 can be a control chip such as an MCU, and the isolation operational amplifier circuit 320 provides impedance isolation, transmitting the voltage signal from the signal acquisition circuit 200 to the MCU's ADC interface. After receiving two voltage signals, the controller 310 compares them with the corresponding reference voltages Vref1 and Vref2 to determine the charging standard type. The two reference voltages are set according to the CC1 signal voltage range in the GB2015, GB2015+, and ChaoJi charging standards. For example, when V1 = 6V and V2 = 4V, the charging standard type is determined to be GBT2015; when V1 = 6V and V2 = 10.9V, the charging standard type is determined to be GBT2015+; and when V1 = 8.8V and V2 = 6V, the charging standard type is determined to be ChaoJi. Then, by controlling the switching states of the switching devices in the control signal switching circuit 100, different charging standards can be switched. For example, when the charging standard is GBT2015, control switches K1 and K3 are closed. After switch K3 is closed, the state of switch K2 does not affect the resistance value. When the charging standard is GBT2015+, control switch K1 is open and switch K2 is closed. The state of switch K3 can be controlled according to the standard logic of GBT2015+, such as opening or closing at different charging stages. When the charging standard is ChaoJi, control switch K1 is closed and switch K2 is open. The state of switch K3 can be controlled according to the standard logic of ChaoJi. The charging standard switching circuit provided in this embodiment of the utility model provides at least three output resistance values ​​by a signal switching unit. The signal switching unit includes a first resistance value switching unit and a second resistance value switching unit. Different output resistance values ​​can be switched through the first and second resistance value switching units to select one of the resistance values ​​for output. Different output resistance values ​​will result in different corresponding output voltage signals. Different output resistance values ​​are equivalent to specific resistance values ​​under different charging standards, thereby adapting to different charging standards and realizing compatibility and switching of multiple charging standards. The voltage signal of the CC1 interface in the vehicle-side charging interface is acquired by the signal acquisition circuit and transmitted to the signal processing circuit for judgment and processing. This determines the charging standard corresponding to the charging gun and the vehicle-side, thereby controlling the signal switching circuit to switch different output resistance values ​​to achieve the switching of different charging standards, improving the universality of the charging pile and the user experience.

[0036] This utility model embodiment also provides a charging pile control board, which includes the above-mentioned charging standard switching circuit.

[0037] It should be noted that the various embodiments in this utility model are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0038] It should also be noted that, in the present invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging standard switching circuit, characterized in that, include: The signal switching circuit, signal acquisition circuit, and signal processing circuit are provided. The signal switching circuit includes a first resistance value switching unit and a second resistance value switching unit. The signal switching circuit is used to provide any one of at least three output resistance values. The first resistance switching unit is electrically connected to the power supply and the second resistance switching unit respectively. The second resistance switching unit is also used to be electrically connected to the CC1 interface of the external vehicle end. The signal processing circuit is electrically connected to the first resistance switching unit, the second resistance switching unit and the signal acquisition circuit respectively. The signal acquisition circuit is also used to be electrically connected to the CC1 interface.

2. The charging standard switching circuit according to claim 1, characterized in that, The first resistance switching unit includes a first resistor, a second resistor, and a first switching device; The first terminals of the first resistor and the second resistor are both electrically connected to the power supply. The second terminal of the first resistor is electrically connected to the first terminal of the first switching device. The second terminal of the second resistor is electrically connected to the second terminal of the first switching device and the second resistance value switching unit, respectively. The third terminal of the first switching device is electrically connected to the signal processing circuit.

3. The charging standard switching circuit according to claim 2, characterized in that, The second resistance switching unit includes a third resistor, a fourth resistor, a second switching device, and a third switching device; The first terminals of the second switching device, the third switching device, and the third resistor are all electrically connected to the first resistance switching unit. The second terminal of the second switching device is electrically connected to the first terminal of the fourth resistor. The second terminals of the third resistor, the fourth resistor, and the third switching device are all used to electrically connect to the CC1 interface. The third terminals of the second switching device and the third switching device are all electrically connected to the signal processing circuit.

4. The charging standard switching circuit according to claim 3, characterized in that, The first switching device, the second switching device, and the third switching device each include any one of the following: a single-pole single-throw relay, or a MOSFET.

5. The charging standard switching circuit according to claim 1, characterized in that, The first resistance switching unit includes a fifth resistor, a sixth resistor, and a double-pole double-throw switch. The first ends of the fifth resistor and the sixth resistor are both electrically connected to the power supply. The second end of the fifth resistor is electrically connected to the first end of the double-pole double-throw switch and the second resistance switching unit, respectively. The second end of the sixth resistor is electrically connected to the second end of the double-pole double-throw switch. The third and fourth ends of the double-pole double-throw switch are both electrically connected to the second resistance switching unit. The fifth end of the double-pole double-throw switch is electrically connected to the signal processing circuit.

6. The charging standard switching circuit according to claim 5, characterized in that, The second resistance switching unit includes a seventh resistor, an eighth resistor, and a fourth switching device; The first end of the seventh resistor is electrically connected to the first end of the fourth switching device, the third and fourth ends of the double-pole double-throw switch, and the second end of the fifth resistor. The first end of the eighth resistor is electrically connected to the third and fourth ends of the double-pole double-throw switch. The seventh resistor, the eighth resistor, and the second end of the fourth switching device are all used to electrically connect to the CC1 interface. The third end of the fourth switching device is electrically connected to the signal processing circuit.

7. The charging standard switching circuit according to claim 1, characterized in that, The signal acquisition circuit includes a resistor voltage divider circuit. The first terminal of the resistor voltage divider circuit is electrically connected to the CC1 interface, the second terminal of the resistor voltage divider circuit is electrically connected to the signal processing circuit, and the third terminal of the resistor voltage divider circuit is grounded.

8. The charging standard switching circuit according to claim 7, characterized in that, The resistor voltage divider circuit includes a ninth resistor and a tenth resistor. One end of the ninth resistor is used to be electrically connected to the CC1 interface, and one end of the tenth resistor is electrically connected to the other end of the ninth resistor and the signal processing circuit. The other end of the tenth resistor is grounded.

9. The charging standard switching circuit according to claim 1, characterized in that, The signal processing circuit includes a controller and an isolation operational amplifier circuit. The isolation operational amplifier circuit is electrically connected to the signal acquisition circuit and the controller, respectively. The controller is also electrically connected to the first resistance switching unit and the second resistance switching unit, respectively.

10. A charging pile control board, characterized in that, Includes the charging standard switching circuit as described in any one of claims 1 to 9.

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