Electric automobile charger

Abstract

The utility model discloses an electric automobile charger which comprises a power supply plug, a cable assembly and a vehicle plug which are sequentially connected, the vehicle plug is used for being connected with a vehicle socket of an electric automobile, and a CC wire connecting point, a CP wire connecting point, an L wire connecting point, an N wire connecting point and a PE wire connecting point are arranged between the vehicle plug and the vehicle socket. The vehicle plug is also provided with a charging end connection confirmation circuit, and the charging end connection confirmation circuit is connected between the CC line connection point and the PE line. The control assembly comprises a temperature sensor, a temperature acquisition module, a microprocessor and a switch S4; the contact end of the switch S4 is connected between the CC line connection point and the PE line, and the control end of the switch S4 is connected to the signal output end of the microprocessor; the signal output end of the temperature sensor is connected to the signal input end of the microprocessor through the temperature acquisition module; by detecting the temperature of the power supply plug, the connection of the charging interface and the CC is interfered, and the over-temperature circuit break protection of the power supply plug is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicles, in particular to an electric vehicle charger. Background Art

[0002] As electric vehicle technology continues to mature, the electric vehicle industry has gradually gained favor among the public, making more and more people choose electric vehicles as a necessary means of transportation. Electric vehicles have the advantages of zero emissions and energy saving, so the market share of electric vehicles is also gradually increasing. However, during the charging process of electric vehicles, the temperature often rises due to poor insertion of the power plug and the power socket. Overheating can cause the charging device to burn out, and even cause personal safety hazards such as electric shock and fire.

[0003] In order to solve the above problems, a patent for an intelligent AC charging gun for electric vehicles, public announcement number CN206370574U provides a technical solution: during the charging process of the charging gun, if the temperature of the gun head of the charging gun is too high, the control circuit board interferes with the CP signal line, and the charging pile detects the abnormality of the CP signal line and cuts off the power supply and stops charging; although this technical solution can realize the function of circuit breaker protection when the temperature of the charging gun is overheated, in actual use, due to poor power supply connection, the temperature is high and low, and the overheat protection will cause K1 / K2 on the power supply line to be frequently switched on and off, which will reduce its mechanical life and affect the working stability of the charging device. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art, provide an electric vehicle charger, and solve the technical problems mentioned in the background technology.

[0005] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0006] The utility model provides an electric vehicle charger, comprising a power supply plug, a cable assembly and a vehicle plug connected in sequence, wherein the vehicle plug is used to connect to a vehicle socket of the electric vehicle, a CC line connection point, a CP line connection point, an L line connection point, an N line connection point and a PE line connection point are arranged between the vehicle plug and the vehicle socket, and a charging end connection confirmation circuit is also arranged on the vehicle plug, and the charging end connection confirmation circuit is connected between the CC line connection point and the PE line; the electric vehicle charger also comprises a control component, and the control component comprises a temperature sensor, a temperature acquisition module, a microprocessor and a switch S4; the contact end of the switch S4 is connected between the CC line connection point and the PE line, and the control end of the switch S4 is connected to the signal output end of the microprocessor; the signal output end of the temperature sensor is connected to the signal input end of the microprocessor through the temperature acquisition module.

[0007] Optionally, the charging terminal connection confirmation circuit includes a resistor R4, a resistor RC and a switch S3, and the resistor R4 is connected in parallel with the switch S3 and then connected in series with the resistor RC.

[0008] Optionally, a resistor Rc is also connected in parallel to the switch S4.

[0009] Optionally, the control component is arranged on the vehicle plug or the power plug, and the temperature sensor is arranged on the power plug.

[0010] Optionally, the microprocessor includes a first comparator, a second comparator and a counter, the first input end of the first comparator is connected to the signal output end of the temperature acquisition module, the output end of the first comparator is connected to the first input end of the second comparator through the counter, the output ends of the first comparator and the second comparator are connected to the control end of the switch S4; the second input ends of the first comparator and the second comparator are respectively connected to the temperature threshold and the counting threshold.

[0011] Optionally, the microprocessor adopts a single-chip microcomputer with built-in comparison function and counting function; the comparison function is used to determine whether the temperature value collected by the temperature acquisition module exceeds the temperature threshold. If it exceeds the temperature threshold, the switch S4 is triggered to open; if it is lower than the temperature threshold, the switch S4 is triggered to close; the counting function is used to obtain the number of times the temperature value collected by the temperature acquisition module exceeds the temperature threshold. If the number exceeds the number threshold, the switch S4 is triggered to be permanently disconnected during this charging cycle.

[0012] Optionally, the temperature acquisition module includes a signal filtering circuit, a signal amplifying circuit and an AD conversion circuit connected in series.

[0013] Optionally, the temperature sensor includes a thermistor and a pull-up resistor, the thermistor and the pull-up resistor are connected in series between the PE line and a power supply VCC, and a common end of the thermistor and the pull-up resistor is connected to the temperature acquisition module.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides an electric vehicle charger, which collects the temperature signal of the power supply plug and compares it with the temperature threshold. When the temperature threshold is exceeded, the communication signal of the charging interface connected to CC is interfered, so that the electric vehicle can timely identify the abnormality of the power supply electrical connection of the power supply device, and then control the power supply device to continue charging or terminate charging, thereby improving the safety of the charging process and avoiding the risk of abnormal temperature rise or even ablation caused by abnormal electrical connection; at the same time, by setting a counting function, when K1 / K2 on the power supply line is frequently connected and disconnected, the current charging cycle can be permanently cut off to protect the working life of K1 / K2. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an electric vehicle charger provided by the first embodiment of the utility model;

[0017] Figure 2 This is a structural schematic diagram of an electric vehicle charger provided in Embodiment 2 of the present utility model. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0019] Embodiment 1:

[0020] like Figure 1 As shown, an embodiment of the utility model provides an electric vehicle charger, comprising a power supply plug, a cable assembly and a vehicle plug connected in sequence, the vehicle plug is used to connect to the vehicle socket of the electric vehicle, a CC line connection point, a CP line connection point, an L line connection point, an N line connection point and a PE line connection point are arranged between the vehicle plug and the vehicle socket, and a charging end connection confirmation circuit is also arranged on the vehicle plug, and the charging end connection confirmation circuit is connected between the CC line connection point and the PE line; the electric vehicle charger also includes a control component, the control component includes a temperature sensor, a temperature acquisition module, a microprocessor and a switch S4; the contact end of the switch S4 is connected between the CC line connection point and the PE line, and the control end of the switch S4 is connected to the signal output end of the microprocessor; the signal output end of the temperature sensor is connected to the signal input end of the microprocessor through the temperature acquisition module.

[0021] Specifically, the charging terminal connection confirmation circuit is designed according to the national standard, including a resistor R4, a resistor RC and a switch S3. The resistor R4 is connected in parallel with the switch S3 and then connected in series with the resistor RC.

[0022] The control component can be arranged on the vehicle plug or the power plug as required, and the temperature sensor must be arranged on the power plug because it needs to collect the temperature of the power plug.

[0023] The temperature sensor uses a thermistor NTC and a pull-up resistor. The thermistor and the pull-up resistor are connected in series between the PE line and the power supply VCC, and the common end of the thermistor and the pull-up resistor is connected to the temperature acquisition module. When the temperature of the power plug is abnormal, the resistance of the thermistor NTC changes, which causes the line voltage to change. The voltage change is collected by the temperature acquisition module. The temperature acquisition module includes a signal filtering circuit, a signal amplification circuit and an AD conversion circuit connected in series. The temperature value is obtained by filtering the collected voltage, amplifying the signal and converting the AD. In other optional embodiments, those skilled in the art can choose, as needed, but not limited to thermocouples, infrared temperature sensors, bimetallic temperature sensors, platinum resistance temperature sensors, etc.

[0024] In this embodiment, the microprocessor uses a single-chip microcomputer with built-in comparison and counting functions; the program is pre-burned in the single-chip microcomputer to execute: the comparison function is used to determine whether the temperature value collected by the temperature acquisition module exceeds the temperature threshold. If it exceeds the temperature threshold, the switch S4 is triggered to disconnect. After the switch S4 is disconnected, the CC line connection point is short-circuited to the PE line, so that the resistance value of the resistor RC on the vehicle plug cannot be detected in the vehicle, and then the whole vehicle confirms that the communication of the charging interface connected to CC is abnormal, and disconnects switches K1 and K2 to terminate charging. If it is lower than the temperature threshold, the switch S4 is triggered to close; the connection between the CC line connection point and the PE line is restored, and the resistance value of the resistor RC on the vehicle plug is detected again in the vehicle, and then it is confirmed that the communication of the charging interface connected to CC is restored to normal, and switches K1 and K2 are closed to continue charging. The counting function is used to obtain the number of times that the temperature value collected by the temperature acquisition module exceeds the temperature threshold. If the number exceeds the threshold, the trigger switch S4 is permanently disconnected during this charging cycle, and the CC line connection point is permanently short-circuited to the PE line, so that the resistance value of the resistor RC on the vehicle plug cannot be detected in the vehicle. Then the whole vehicle confirms that the communication between the charging interface and CC is abnormal, and the switches K1 and K2 are permanently disconnected to terminate charging.

[0025] Furthermore, a resistor Rc can be connected in parallel to the switch S4. After the switch S4 is disconnected, the resistance value detected on the vehicle plug is RC+Rc, and then the vehicle confirms that the communication between the charging interface and CC is abnormal, and disconnects switches K1 and K2 to terminate charging. In other optional implementations, those skilled in the art can also change the resistance value on the vehicle plug in other ways to trigger the communication abnormality of the connection CC.

[0026] Embodiment 2:

[0027] like Figure 2As shown, the embodiment of the utility model provides an electric vehicle charger. On the basis of the first embodiment, the microprocessor is replaced by a pure hardware control mode from the software and hardware control mode of the single-chip microcomputer. The microprocessor includes a first comparator, a second comparator and a counter. The first input end of the first comparator is connected to the signal output end of the temperature acquisition module, the output end of the first comparator is connected to the first input end of the second comparator through the counter, and the output ends of the first comparator and the second comparator are connected to the control end of the switch S4; the second input ends of the first comparator and the second comparator are respectively connected to the temperature threshold and the counting threshold. The temperature threshold and the counting threshold can be connected to the circuit through a reference voltage source.

[0028] The temperature value output by the temperature acquisition module is compared with the temperature threshold by the first comparator. When the temperature value exceeds the temperature threshold, the first comparator outputs a high level to trigger the switch S4 to disconnect and trigger the counter to count. At this time, the counter has no output; when the temperature value is lower than the temperature threshold, the first comparator outputs a low level to trigger the switch S4 to close. When the count value of the counter exceeds the count threshold, the second comparator outputs a high level to trigger the switch S4 to disconnect. At this time, no matter whether the first comparator outputs a high level or a low level, it cannot trigger the switch S4 to operate.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An electric vehicle charger, comprising a power supply plug, a cable assembly and a vehicle plug connected in sequence, wherein the vehicle plug is used to connect to a vehicle socket of an electric vehicle, a CC line connection point, a CP line connection point, an L line connection point, an N line connection point and a PE line connection point are arranged between the vehicle plug and the vehicle socket, and a charging terminal connection confirmation circuit is also arranged on the vehicle plug, and the charging terminal connection confirmation circuit is connected between the CC line connection point and the PE line; characterized in that The electric vehicle charger also includes a control component, which includes a temperature sensor, a temperature acquisition module, a microprocessor and a switch S4; the contact end of the switch S4 is connected between the CC line connection point and the PE line, and the control end of the switch S4 is connected to the signal output end of the microprocessor; the signal output end of the temperature sensor is connected to the signal input end of the microprocessor through the temperature acquisition module.

2. The electric vehicle charger according to claim 1, characterized in that: The charging terminal connection confirmation circuit includes a resistor R4, a resistor RC and a switch S3. The resistor R4 is connected in parallel with the switch S3 and then connected in series with the resistor RC.

3. The electric vehicle charger according to claim 1, characterized in that: The switch S4 is also connected in parallel with a resistor Rc.

4. The electric vehicle charger according to claim 1, characterized in that: The control component is arranged on the vehicle plug or the power plug, and the temperature sensor is arranged on the power plug.

5. The electric vehicle charger according to claim 1, characterized in that: The microprocessor includes a first comparator, a second comparator and a counter, wherein the first input end of the first comparator is connected to the signal output end of the temperature acquisition module, the output end of the first comparator is connected to the first input end of the second comparator through the counter, the output ends of the first comparator and the second comparator are connected to the control end of the switch S4; the second input ends of the first comparator and the second comparator are respectively connected to the temperature threshold and the counting threshold.

6. The electric vehicle charger according to claim 1, characterized in that: The microprocessor adopts a single chip microcomputer with built-in comparison function and counting function; through the comparison function, it is judged whether the temperature value collected by the temperature acquisition module exceeds the temperature threshold. If it exceeds the temperature threshold, the switch S4 is triggered to be disconnected; if it is lower than the temperature threshold, the switch S4 is triggered to be closed; The number of times the temperature value collected by the temperature collection module exceeds the temperature threshold is obtained through a counting function. If the number exceeds the threshold, the switch S4 is triggered to be permanently disconnected during this charging cycle.

7. The electric vehicle charger according to claim 1, characterized in that: The temperature acquisition module comprises a signal filtering circuit, a signal amplifying circuit and an AD conversion circuit which are connected in series.

8. The electric vehicle charger according to claim 1, characterized in that: The temperature sensor comprises a thermistor and a pull-up resistor, the thermistor and the pull-up resistor are connected in series between the PE line and a power source VCC, and a common end of the thermistor and the pull-up resistor is connected to the temperature acquisition module.

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