CN217739399U

CN217739399U - Relay state detection module, new energy vehicle charging control device and control box

Info

Publication number: CN217739399U
Application number: CN202221030479.XU
Authority: CN
Inventors: ***; 贾晓雨; 茅昕辉; 吴一松; 刘广利
Original assignee: Tyco Electronics Shanghai Co Ltd
Current assignee: Tyco Electronics Shanghai Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-11-04
Anticipated expiration: 2032-04-29

Abstract

The utility model discloses a relay state detection module, new forms of energy car charge control device and control box. The relay state detection module includes: the micro-control unit comprises resistors R6-R9 and high-voltage isolation capacitors C1 and C2. The micro control unit includes: output pins PWM1 and PWM2; analog-to-digital converters ADC1 and ADC2; the control device is used for controlling the output pins PWM1 and PWM2 to output PWM signals; the detection device is used for detecting output signals of the analog-to-digital converters ADC1 and ADC2; and judging means for judging whether or not the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal based on the detected output signals of the analog-to-digital converters ADC1 and ADC 2. The utility model discloses in, can detect out the on off state of relay under the condition of not using group battery voltage and filling electric pile voltage and whether have unusually.

Description

Relay state detection module, new energy vehicle charging control device and control box

Technical Field

The utility model relates to a relay state detection module, a relay detection method, a new forms of energy car charge control device including this relay state detection module and including this new forms of energy car charge control device's control box.

Background

In prior art, when detecting whether the relay switch among the high voltage Power Distribution Unit (PDU) of new forms of energy car is stained with and glues, need use group battery voltage or fill electric pile voltage. That is to say when detecting whether the relay switch is stained with the gluing, the electric connecting line between relay switch and the group battery or the electric connecting line between relay switch and the electric pile of filling is the intercommunication.

However, in some special applications, when detecting whether the relay switch is sticky, the electrical connection line between the relay switch and the battery pack and the electrical connection line between the relay switch and the charging pile must be disconnected (for example, the electrical connection line between the relay switch and the battery pack and the electrical connection line between the relay switch and the charging pile are disconnected by disconnecting the internal switches of the battery pack and the charging pile), and at this time, the existing method cannot be used to detect whether the relay switch is sticky.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to solve at least one of the above problems and drawbacks existing in the prior art.

According to the utility model discloses an aspect provides a relay state detection module for whether the on off state of detection relay K6 and K7 is unusual, the one end of relay K6 and K7's switch links to each other, the other end ground connection of relay K7's switch. The relay state detection module includes: the micro control unit comprises output pins PWM1 and PWM2 suitable for outputting PWM signals and analog-to-digital converters ADC1 and ADC2; one end of the resistor R6 is connected with one ends of the switches of the relays K6 and K7; one end of the resistor R7 is connected with the output pin PWM1, and the other end of the resistor R7 is connected with the input end of the analog-to-digital converter ADC 1; two ends of the high-voltage isolation capacitor C1 are respectively connected with the other end of the resistor R6 and the other end of the resistor R7; one end of the resistor R8 is connected with the other end of the switch of the relay K6; one end of the resistor R9 is connected with the output pin PWM2, and the other end of the resistor R9 is connected with the input end of the analog-to-digital converter ADC2; and the two ends of the high-voltage isolation capacitor C2 are respectively connected with the other end of the resistor R8 and the other end of the resistor R9. The micro control unit further comprises: the control device is used for controlling the output pins PWM1 and PWM2 to output PWM signals; the detection device is used for detecting output signals of the analog-to-digital converters ADC1 and ADC2; and judging means for judging whether or not the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal based on the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

According to an exemplary embodiment of the present invention, when the on-off states of the relays K6 and K7 judged by the judging device are inconsistent with the preset on-off states of the relays K6 and K7 preset by the micro control unit, the judging device judges that the on-off states of the relays K6 and K7 are abnormal; when the on-off states of the relays K6 and K7 judged by the judging device are consistent with the preset on-off states of the relays K6 and K7 preset by the micro control unit, the judging device judges that the on-off states of the relays K6 and K7 are normal.

According to another exemplary embodiment of the present invention, when the detection device detects the output signal of the analog-to-digital converter ADC1, the control device controls the output pin PWM1 to output a PWM signal and the output pin PWM2 to be at a low level; when the detection device detects the output signal of the analog-to-digital converter ADC2, the control device controls the output pin PWM2 to output a PWM signal and the output pin PWM1 to be at a low level.

According to another exemplary embodiment of the present invention, when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detecting device are both the PWM signals, the judging device judges that the on-off states of the relays K6 and K7 are both off; when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are both the first detection signal WFM1, the judgment device judges the on-off states of the relays K6 and K7 to be on and off respectively; when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are the second detection signal WFM2 and the PWM signal, respectively, the judgment device judges whether the on-off states of the relays K6 and K7 are open and closed, respectively; when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are both the second detection signal WFM2, the judgment device judges that the switches of the relays K6 and K7 are both closed, and the frequencies and duty ratios of the first detection signal WFM1, the second detection signal WFM2, and the PWM signal are the same but different from each other.

According to another exemplary embodiment of the present invention, the relay state detection module further comprises: and the communication device is connected with the micro control unit and is used for transmitting the information whether the on-off states of the relays K6 and K7 judged by the micro control unit are abnormal to the electric control unit of the new energy vehicle.

According to another example embodiment of the present invention, the communication device comprises: the digital isolator is communicated with the serial port of the micro control unit; and the interface converter is in serial port communication with the digital isolator and is suitable for being in communication with an electric control unit of the new energy vehicle through a CAN bus or a CANFD bus.

According to another exemplary embodiment of the present invention, the resistance values of the resistor R6, the resistor R7, the resistor R8 and the resistor R9 are the same, and the capacitance values of the high voltage isolation capacitors C1 and C2 are the same.

According to another exemplary embodiment of the present invention, the resistance values of the resistors R6, R7, R8 and R9 are equal to 5M Ω, and the capacitance values of the high voltage isolation capacitors C1 and C2 are equal to 1nF.

According to the utility model discloses an another aspect provides a new forms of energy car charge control device, include: one end of a switch of the relay K6 is used for being connected to the negative electrode of the charging pile, and the other end of the switch of the relay K7 is used for being connected with one end of the switch of the relay K7; one end of a switch of the relay K7 is connected with one end of a switch of the relay K6, and the other end of the switch is grounded; the positive electrode of the high-voltage isolation capacitor C3 is connected with the positive electrode of the charging pile, and the negative electrode of the high-voltage isolation capacitor C3 is connected with the other end of the switch of the relay K7; and the relay state detection module is used for detecting whether the switch states of the relays K6 and K7 are abnormal or not, and when the switch states of the relays K6 and K7 are detected to be abnormal or not, the internal switch of the battery pack and the internal switch of the charging pile are both disconnected.

According to the utility model discloses an exemplary embodiment, new forms of energy car charge control device still includes: and the voltage detection module is used for detecting the voltage between the anode and the cathode of the charging pile.

According to another exemplary embodiment of the present invention, the voltage detection module comprises: the plurality of voltage division resistors are connected in series between the anode and the cathode of the charging pile; and the micro control unit. The micro control unit includes: the input end of the analog-to-digital converter ADC3 is connected between two divider resistors in the plurality of divider resistors and is used for collecting voltage; and the calculating device is used for calculating the voltage V between the anode and the cathode of the charging pile according to the voltage Vadc3 acquired by the analog-to-digital converter ADC 3.

According to another exemplary embodiment of the present invention, the plurality of voltage dividing resistors include five voltage dividing resistors R1, R2, R3, R4 and R5 connected in series in sequence, one end of the voltage dividing resistor R1 is connected to the positive electrode of the charging pile, and one end of the voltage dividing resistor R5 is connected to the negative electrode of the charging pile; the resistance values of the divider resistors R1, R2, R3 and R4 are equal and larger than that of the divider resistor R5, and the input end of the analog-to-digital converter ADC3 is connected with the other end of the divider resistor R5 and used for collecting the voltage on the divider resistor R5; the calculation means calculates a voltage V between the positive and negative electrodes of the charging pile according to the following formula,

V＝HV+-HV-＝Vadc3*(R1+R2+R3+R4+R5)/R5,

wherein HV + represents the positive voltage of the charging pile, and HV-represents the negative voltage of the charging pile.

According to another exemplary embodiment of the present invention, the micro control unit is further configured to control the energization and the de-energization of the coils of the relays K6 and K7, so that the on-off state of the relays K6 and K7 can be controlled by controlling the energization and the de-energization of the coils of the relays K6 and K7.

According to the utility model discloses a further exemplary embodiment, new forms of energy car charge control device still includes: the input ends of the two optocouplers are respectively connected with two pins of the micro control unit; and the input ends of the two relay drivers are respectively connected with the output ends of the two optocouplers, the output ends of the two relay drivers are respectively connected with the coils of the relays K6 and K7, and the micro control unit controls the energization and the de-energization of the coils of the relays K6 and K7 by controlling the on and off of the two optocouplers.

According to the utility model discloses a further exemplary embodiment, divider resistance R1, R2, R3 and R4's resistance value equals 1.7M omega, divider resistance R5's resistance value equals 34K omega, electric capacity C3's capacitance value equals 100uF is kept apart to the high pressure.

According to the utility model discloses a further exemplary embodiment, relay state detection module include with the communication device that little the control unit connects, communication device be used for with whether unusual information of relay K6 and K7's that little the control unit judged the on-off state with voltage detection module detects fill voltage information transmission between electric pile's the positive pole and the negative pole for the electrical unit of new forms of energy car.

According to another aspect of the present invention, there is provided a control box, including: a case body; and the charging control device of the new energy vehicle is arranged in the box body.

According to an exemplary embodiment of the utility model, new energy vehicle charging control device is integrated on the circuit board, the circuit board is installed in the box body.

According to another aspect of the present invention, there is provided a relay state detection method, comprising the steps of:

providing the relay state detection module;

controlling one output pin of the output pins PWM1 and PWM2 to output a PWM signal, controlling the other output pin to be at a low level, and detecting an output signal of one analog-to-digital converter corresponding to the output pin in the analog-to-digital converters ADC1 and ADC2;

controlling the other output pin of the output pins PWM1 and PWM2 to output a PWM signal, and controlling the one output pin to be at a low level, and detecting an output signal of the other analog-to-digital converter corresponding to the other output pin of the analog-to-digital converters ADC1 and ADC2; and

and judging whether the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal or not according to the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

According to an exemplary embodiment of the present invention, when the determined on-off states of the relays K6 and K7 are inconsistent with the preset on-off states of the preset relays K6 and K7, the on-off states of the relays K6 and K7 are determined to be abnormal; and when the judged on-off states of the relays K6 and K7 are consistent with the preset on-off states of the relays K6 and K7, judging that the on-off states of the relays K6 and K7 are normal.

According to the utility model discloses an in the aforesaid each exemplary embodiment, can detect out whether the on off state of relay exists unusually under the condition of not using group battery voltage and filling electric pile voltage.

Other objects and advantages of the present invention will become apparent from the following description of the invention, which is made with reference to the accompanying drawings, and can help to provide a thorough understanding of the present invention.

Drawings

Fig. 1 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which relays K6 and K7 are both off;

fig. 2 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which the switching states of the relays K6 and K7 are closed and open, respectively;

fig. 3 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which the switching states of the relays K6 and K7 are open and closed, respectively;

fig. 4 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which the relay states of the relays K6 and K7 are both closed;

fig. 5 shows a schematic diagram of three detected output signals of the analog-to-digital converters ADC1 and ADC2 according to an exemplary embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the invention with reference to the drawings is intended to explain the general inventive concept and should not be taken as a limitation of the invention.

Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.

According to the utility model discloses a general technical concept provides a relay state detection module for whether the on off state that detects relay K6 and K7 is unusual, the one end of relay K6 and K7's switch links to each other, the other end ground connection of relay K7's switch. The relay state detection module includes: the micro control unit comprises output pins PWM1 and PWM2 suitable for outputting PWM signals and analog-to-digital converters ADC1 and ADC2; one end of the resistor R6 is connected with one ends of the switches of the relays K6 and K7; one end of the resistor R7 is connected with the output pin PWM1, and the other end of the resistor R7 is connected with the input end of the analog-to-digital converter ADC 1; two ends of the high-voltage isolation capacitor C1 are respectively connected with the other end of the resistor R6 and the other end of the resistor R7; one end of the resistor R8 is connected with the other end of the switch of the relay K6; one end of the resistor R9 is connected with the output pin PWM2, and the other end of the resistor R9 is connected with the input end of the analog-to-digital converter ADC2; and the two ends of the high-voltage isolation capacitor C2 are respectively connected with the other end of the resistor R8 and the other end of the resistor R9. The micro control unit further comprises: the control device is used for controlling the output pins PWM1 and PWM2 to output PWM signals; the detection device is used for detecting output signals of the analog-to-digital converters ADC1 and ADC2; and judging means for judging whether or not the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal based on the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

According to the utility model discloses a another general technical concept provides a new forms of energy car charge control device, include: one end of a switch of the relay K6 is used for being connected to the negative electrode of the charging pile, and the other end of the switch of the relay K7 is used for being connected with one end of the switch of the relay K7; one end of a switch of the relay K7 is connected with one end of a switch of the relay K6, and the other end of the switch is grounded; the positive electrode of the high-voltage isolation capacitor C3 is used for being connected with the positive electrode of the charging pile, and the negative electrode of the high-voltage isolation capacitor C3 is connected with the other end of the switch of the relay K7; and the relay state detection module is used for detecting whether the switch states of the relays K6 and K7 are abnormal or not, and detecting whether the switch states of the relays K6 and K7 are abnormal or not, wherein the internal switch of the battery pack and the internal switch of the charging pile are both disconnected.

According to another general technical concept of the present invention, there is provided a control box, including: a box body; and the new energy vehicle charging control device is arranged in the box body.

According to another general technical concept of the present invention, there is provided a relay state detecting method, comprising: providing the relay state detection module; controlling one output pin of the output pins PWM1 and PWM2 to output a PWM signal, and controlling the other output pin to be at a low level, and detecting an output signal of one analog-to-digital converter corresponding to the one output pin in the analog-to-digital converters ADC1 and ADC2; controlling the other output pin of the output pins PWM1 and PWM2 to output a PWM signal, and controlling the one output pin to be at a low level, and detecting an output signal of the other analog-to-digital converter corresponding to the other output pin of the analog-to-digital converters ADC1 and ADC2; and judging whether the switch states of the relays K6 and K7 and the switch states of the relays K6 and K7 are abnormal or not according to the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

Fig. 1 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which the switching states of the relays K6 and K7 are both off.

As shown in fig. 1, in the illustrated embodiment, the new energy vehicle charging control device includes a relay K6, a relay K7, a high-voltage isolation capacitor C3, and a relay state detection module.

As shown in fig. 1, in the illustrated embodiment, one end of the switch of the relay K6 is used to connect to one end of the switch of K7, and the other end is used to connect to the negative pole of the battery pack. One end of the switch of the relay K7 is connected with one end of the switch of the relay K6, and the other end of the switch of the relay K7 is grounded.

As shown in fig. 1, in the illustrated embodiment, the positive electrode of the high-voltage isolation capacitor C3 is used to connect with the positive electrode of the charging pile, and the negative electrode of the high-voltage isolation capacitor C3 is connected with the other end of the switch of the relay K7.

As shown in fig. 1, in the illustrated embodiment, the relay state detection module is used to detect whether the switching states of the relays K6 and K7 are abnormal. And when detecting whether the on-off states of the relays K6 and K7 are abnormal or not, the internal switch of the battery pack and the internal switch of the charging pile are both disconnected. Therefore, in the illustrated embodiment, the voltages of the battery pack and the charging post cannot be used when detecting whether the switching states of the relays K6 and K7 are abnormal.

As shown in fig. 1, in the illustrated embodiment, the relay state detection module includes: a micro control unit 10 including output pins PWM1 and PWM2 adapted to output PWM signals and analog-to-digital converters ADC1 and ADC2; one end of the resistor R6 is connected with one ends of the switches of the relays K6 and K7; one end of the resistor R7 is connected with the output pin PWM1, and the other end of the resistor R7 is connected with the input end of the analog-to-digital converter ADC 1; two ends of the high-voltage isolation capacitor C1 are respectively connected with the other end of the resistor R6 and the other end of the resistor R7; one end of the resistor R8 is connected with the other end of the switch of the relay K6; one end of the resistor R9 is connected with the output pin PWM2, and the other end of the resistor R9 is connected with the input end of the analog-to-digital converter ADC2; and the two ends of the high-voltage isolation capacitor C2 are respectively connected with the other end of the resistor R8 and the other end of the resistor R9.

As shown in fig. 1, in the illustrated embodiment, the micro control unit 10 further includes: a control device (not shown, which may be a soft-hard combined functional module) for controlling the output pins PWM1 and PWM2 to output PWM signals; a detecting device (not shown, which may be a soft-hard combined functional module) for detecting output signals of the analog-to-digital converters ADC1 and ADC2; and a judging device (not shown, which may be a function module combining software and hardware) for judging whether the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal according to the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

As shown in fig. 1, in the illustrated embodiment, when the on-off states of the relays K6 and K7 judged by the judging means do not coincide with the preset on-off states of the relays K6 and K7 preset by the micro control unit 10, the judging means judges that the on-off states of the relays K6 and K7 are abnormal. When the on-off states of the relays K6 and K7 judged by the judging device are consistent with the preset on-off states of the relays K6 and K7 preset by the micro control unit 10, the judging device judges that the on-off states of the relays K6 and K7 are normal.

As shown in fig. 1, in the illustrated embodiment, when the detection device detects the output signal of the analog-to-digital converter ADC1, the control device controls the output pin PWM1 to output a PWM signal and the output pin PWM2 to be at a low level; when the detection device detects the output signal of the analog-to-digital converter ADC2, the control device controls the output pin PWM2 to output a PWM signal and the output pin PWM1 to be at a low level.

As shown in fig. 1, in the illustrated embodiment, when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are both the PWM signals, the determination device determines that the switching states of the relays K6 and K7 are both off.

Fig. 2 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which the on-off states of the relays K6 and K7 are closed and open, respectively.

As shown in fig. 2, in the illustrated embodiment, when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are both the first detection signal WFM1, the determination device determines the switch states of the relays K6 and K7 to be closed and opened, respectively.

Fig. 3 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which the switching states of the relays K6 and K7 are open and closed, respectively.

As shown in fig. 3, in the illustrated embodiment, when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are the second detection signal WFM2 and the PWM signal, respectively, the judgment device judges the switching states of the relays K6 and K7 to be open and closed, respectively.

Fig. 4 shows a schematic circuit diagram of a new energy vehicle charging control device according to an exemplary embodiment of the present invention, in which the switching states of the relays K6 and K7 are both closed.

As shown in fig. 4, in the illustrated embodiment, when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are both the second detection signal WFM2, the determination device determines that the switches of the relays K6 and K7 are both closed.

As shown in fig. 1 to 4, in an exemplary embodiment of the present invention, the resistance values of the resistor R6, the resistor R7, the resistor R8 and the resistor R9 are the same, and the capacitance values of the high voltage isolation capacitors C1 and C2 are the same. For example, in an exemplary embodiment of the present invention, the resistances of the resistors R6, R7, R8, and R9 may be equal to 5M Ω, and the capacitance values of the high-voltage isolation capacitors C1 and C2 may be equal to 1nF. At this time, the frequencies and the duty ratios of the first detection signal WFM1, the second detection signal WFM2, and the PWM signal are the same as each other but the amplitudes are different from each other. Accordingly, the first detection signal WFM1, the second detection signal WFM2, and the PWM signal may be distinguished by amplitude.

As shown in fig. 5, in the illustrated embodiment, the resistors R6, R7, R8, and R9 have a resistance value equal to 5M Ω, and the high-voltage isolation capacitors C1 and C2 have a capacitance value equal to 1nF. The PWM signal is a square wave with a frequency of 100Hz, a duty cycle of 50% and an amplitude of 5V. The first detection signal WFM1 is a square wave having an amplitude of about 4V, and the frequency and duty ratio of the first detection signal WFM1 are identical to those of the PWM signal. The second detection signal WFM2 is a square wave having an amplitude of about 3V, and the frequency and duty ratio of the second detection signal WFM2 are identical to those of the PWM signal.

As shown in fig. 1 to 4, in the illustrated embodiment, the relay state detection module further includes: communication means 11, 12. The

communication devices

11 and 12 are connected to the micro control unit 10, and are configured to transmit information about whether the switching states of the relays K6 and K7 determined by the micro control unit 10 are abnormal to an electronic control unit (ECU, not shown) of the new energy vehicle.

As shown in fig. 1 to 4, in the illustrated embodiment, the

communication devices

11, 12 include: the digital isolator 11 is in serial port communication with the micro control unit 10; and the interface converter 12 is in serial port communication with the digital isolator 11 and is suitable for being in communication with an electric control unit of the new energy vehicle through a CAN bus or a CAN FD bus.

As shown in fig. 1 to 4, in an exemplary embodiment of the present invention, a relay status detecting method is further disclosed, which includes the following steps:

s11: providing the relay state detection module;

s12: controlling the output pin PWM1 to output a PWM signal and the output pin PWM2 to be at a low level, and detecting an output signal of the analog-to-digital converter ADC 1;

s13: controlling the output pin PWM2 to output a PWM signal and the output pin PWM1 to be at a low level, and detecting an output signal of the analog-to-digital converter ADC2; and

s14: and judging whether the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal or not according to the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

s21: providing the relay state detection module;

s22: controlling the output pin PWM2 to output a PWM signal and the output pin PWM1 to be at a low level, and detecting an output signal of the analog-to-digital converter ADC2;

s23: controlling the output pin PWM1 to output a PWM signal and the output pin PWM2 to be at a low level, and detecting an output signal of the analog-to-digital converter ADC 1; and

s24: and judging whether the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal or not according to the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

As shown in fig. 1 to 4, in the illustrated embodiment, the new energy vehicle charging control device further includes a voltage detection module, where the voltage detection module is configured to detect a voltage between a positive electrode and a negative electrode of the charging pile.

As shown in fig. 1 to 4, in the illustrated embodiment, the voltage detection module includes: a plurality of divider resistors R1-R5 and the micro control unit 10. A plurality of divider resistance R1 ~ R5 are established ties between the positive pole and the negative pole of filling electric pile. The micro control unit 10 further comprises: the input end of the analog-to-digital converter ADC3 is connected between any two divider resistors in the divider resistors R1-R5 and is used for collecting voltage; and a calculating device (not shown), which may be a soft-hard combined functional module, for calculating a voltage V between the positive pole and the negative pole of the charging pile according to the voltage Vadc3 collected by the analog-to-digital converter ADC 3.

As shown in fig. 1 to 4, in the illustrated embodiment, the

communication devices

11 and 12 are further configured to transmit the voltage information between the positive electrode and the negative electrode of the charging pile detected by the voltage detection module to an electronic control unit (ECU, not shown) of the new energy vehicle.

As shown in fig. 1 to 4, in the illustrated embodiment, the voltage dividing resistors R1 to R5 include five voltage dividing resistors R1, R2, R3, R4, and R5 connected in series in sequence, one end of the voltage dividing resistor R1 is connected to the positive electrode of the charging pile, and one end of the voltage dividing resistor R5 is connected to the negative electrode of the charging pile. The resistance values of the divider resistors R1, R2, R3 and R4 are equal and larger than the resistance value of the divider resistor R5, and the input end of the analog-to-digital converter ADC3 is connected with the other end of the divider resistor R5 and used for collecting the voltage on the divider resistor R5.

As shown in fig. 1 to 4, in the illustrated embodiment, the calculation means calculates (1) a voltage V between the positive electrode and the negative electrode of the charging pile according to the following formula,

V＝HV+-HV-＝Vadc3*(R1+R2+R3+R4+R5)/R5, (1)

As shown in fig. 1 to 4, in the illustrated embodiment, the micro control unit 10 is further configured to control the energization and de-energization of the coils of the relays K6 and K7, so that the switching states of the relays K6 and K7 can be controlled by controlling the energization and de-energization of the coils of the relays K6 and K7.

As shown in fig. 1 to 4, in the illustrated embodiment, the new energy vehicle charging control device further includes: two

optocouplers

61, 71 and two relay drives 62, 72. The input ends of the two

optocouplers

61 and 71 are respectively connected with two pins of the micro control unit 10. The input ends of the two

relay drivers

62 and 72 are respectively connected with the output ends of the two

optocouplers

61 and 71, and the output ends of the two

relay drivers

62 and 72 are respectively connected with the coils of the relays K6 and K7. The micro control unit 10 controls the energization and the de-energization of the coils of the relays K6 and K7 by controlling the on and off of the two opto-

couplers

61, 71.

As shown in fig. 1 to 4, in an exemplary embodiment of the present invention, the resistance values of the voltage dividing resistors R1, R2, R3 and R4 may be equal to 1.7M Ω, the resistance value of the voltage dividing resistor R5 may be equal to 34K Ω, and the capacitance value of the high voltage isolation capacitor C3 may be equal to 100uF. However, the present invention is not limited to the illustrated embodiment, and for example, the number and resistance of the voltage dividing resistors and the capacitance of the high voltage isolation capacitor C3 may be appropriately selected as needed.

As shown in fig. 1 to 4, in an exemplary embodiment of the present invention, there is also disclosed a control box including: a box body; and the new energy vehicle charging control device is arranged in the box body.

As shown in fig. 1 to 4, in an exemplary embodiment of the present invention, the new energy vehicle charging control device is integrated on a circuit board, and the circuit board is installed in the box body.

It is understood by those skilled in the art that the above-described embodiments are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle, and that such modifications are intended to fall within the scope of the present invention.

Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify preferred embodiments of the present invention, and should not be construed as limiting the present invention.

Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude a plurality. Additionally, any element numbers of the claims should not be construed as limiting the scope of the invention.

Claims

1. The utility model provides a relay state detection module for whether the on off state that detects relay K6 and K7 is unusual, the one end of relay K6 and K7's switch links to each other, and the other end ground connection of relay K7's switch, its characterized in that, relay state detection module includes:

a micro control unit (10) comprising output pins PWM1 and PWM2 and analog to digital converters ADC1 and ADC2 adapted to output PWM signals;

one end of the resistor R6 is connected with one ends of the switches of the relays K6 and K7;

one end of the resistor R7 is connected with the output pin PWM1, and the other end of the resistor R7 is connected with the input end of the analog-to-digital converter ADC 1;

two ends of the high-voltage isolation capacitor C1 are respectively connected with the other end of the resistor R6 and the other end of the resistor R7;

one end of the resistor R8 is connected with the other end of the switch of the relay K6;

one end of the resistor R9 is connected with the output pin PWM2, and the other end of the resistor R9 is connected with the input end of the analog-to-digital converter ADC2; and

two ends of the high-voltage isolation capacitor C2 are respectively connected with the other end of the resistor R8 and the other end of the resistor R9,

the micro control unit (10) further comprises:

the control device is used for controlling the output pins PWM1 and PWM2 to output PWM signals;

the detection device is used for detecting output signals of the analog-to-digital converters ADC1 and ADC2; and

and the judging device is used for judging whether the switching states of the relays K6 and K7 and the switching states of the relays K6 and K7 are abnormal or not according to the detected output signals of the analog-to-digital converters ADC1 and ADC 2.

2. The relay status detection module of claim 1, wherein:

when the on-off states of the relays K6 and K7 judged by the judging device are inconsistent with the preset on-off states of the relays K6 and K7 preset by the micro control unit (10), the judging device judges that the on-off states of the relays K6 and K7 are abnormal;

when the on-off states of the relays K6 and K7 judged by the judging device are consistent with the preset on-off states of the relays K6 and K7 preset by the micro control unit (10), the judging device judges that the on-off states of the relays K6 and K7 are normal.

3. The relay status detection module of claim 2, wherein:

when the detection device detects the output signal of the analog-to-digital converter ADC1, the control device controls the output pin PWM1 to output a PWM signal and the output pin PWM2 to be at a low level;

when the detection device detects the output signal of the analog-to-digital converter ADC2, the control device controls the output pin PWM2 to output a PWM signal and the output pin PWM1 to be at a low level.

4. The relay status detection module of claim 3, wherein:

when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are the PWM signals, the judgment device judges that the on-off states of the relays K6 and K7 are both off;

when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are both the first detection signal WFM1, the judgment device judges the on-off states of the relays K6 and K7 to be on and off respectively;

when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are the second detection signal WFM2 and the PWM signal, respectively, the determination device determines that the on-off states of the relays K6 and K7 are open and closed, respectively;

when the output signals of the analog-to-digital converters ADC1 and ADC2 detected by the detection device are both the second detection signal WFM2, the judgment device judges that the on-off states of the relays K6 and K7 are both closed,

the frequencies and duty ratios of the first detection signal WFM1, the second detection signal WFM2, and the PWM signal are the same as each other but the amplitudes are different from each other.

5. The relay status detection module according to any one of claims 1 to 4, further comprising:

and the communication devices (11 and 12) are connected with the micro control unit (10) and are used for transmitting the information whether the switching states of the relays K6 and K7 judged by the micro control unit (10) are abnormal to an electric control unit of the new energy vehicle.

6. The relay status detection module of claim 5, wherein:

the communication device (11, 12) comprises:

the digital isolator (11) is in serial port communication with the micro control unit (10); and

and the interface converter (12) is in serial port communication with the digital isolator (11) and is suitable for being in communication with an electric control unit of the new energy vehicle through a CAN bus or a CANFD bus.

7. The relay status detection module according to claim 1, characterized in that:

the resistance values of the resistor R6, the resistor R7, the resistor R8 and the resistor R9 are the same, and the capacitance values of the high-voltage isolation capacitors C1 and C2 are the same.

8. The relay status detection module of claim 1, wherein:

the resistance values of the resistors R6, R7, R8 and R9 are equal to 5M omega, and the capacitance values of the high-voltage isolation capacitors C1 and C2 are equal to 1nF.

9. The utility model provides a new energy vehicle charge control device which characterized in that includes:

one end of a switch of the relay K6 is used for being connected to the negative electrode of the charging pile, and the other end of the switch of the relay K7 is used for being connected with one end of the switch of the relay K7;

one end of a switch of the relay K7 is connected with one end of a switch of the relay K6, and the other end of the switch is grounded;

the positive electrode of the high-voltage isolation capacitor C3 is connected with the positive electrode of the charging pile, and the negative electrode of the high-voltage isolation capacitor C3 is connected with the other end of the switch of the relay K7; and

the relay state detection module of any one of claims 1-8, configured to detect whether the switching states of the relays K6 and K7 are abnormal,

and when detecting whether the on-off states of the relays K6 and K7 are abnormal, the internal switch of the battery pack and the internal switch of the charging pile are both disconnected.

10. The new energy vehicle charging control device according to claim 9, further comprising:

and the voltage detection module is used for detecting the voltage between the anode and the cathode of the charging pile.

11. The new energy vehicle charging control device according to claim 10, characterized in that:

the voltage detection module includes:

the voltage dividing resistors R1-R5 are connected in series between the anode and the cathode of the charging pile; and

the micro control unit (10) comprising:

the input end of the analog-to-digital converter ADC3 is connected between some two divider resistors in the divider resistors R1-R5 and is used for collecting voltage; and

and the calculating device is used for calculating the voltage V between the anode and the cathode of the charging pile according to the voltage Vadc3 acquired by the analog-to-digital converter ADC 3.

12. The new energy vehicle charging control device according to claim 11, characterized in that:

the voltage dividing resistors R1-R5 comprise five voltage dividing resistors R1, R2, R3, R4 and R5 which are sequentially connected in series, one end of the voltage dividing resistor R1 is connected to the anode of the charging pile, and one end of the voltage dividing resistor R5 is connected to the cathode of the charging pile;

the resistance values of the divider resistors R1, R2, R3 and R4 are equal and larger than the resistance value of the divider resistor R5, and the input end of the analog-to-digital converter ADC3 is connected with the other end of the divider resistor R5 and used for collecting the voltage on the divider resistor R5;

the calculation means calculates a voltage V between the positive and negative electrodes of the charging pile according to the following formula,

V＝HV+-HV-＝Vadc3*(R1+R2+R3+R4+R5)/R5,

13. The new energy vehicle charging control device according to any one of claims 9 to 12, wherein:

the micro control unit (10) is also used for controlling the energization and the deenergization of the coils of the relays K6 and K7, so that the switch states of the relays K6 and K7 can be controlled by controlling the energization and the deenergization of the coils of the relays K6 and K7.

14. The new energy vehicle charging control device according to claim 13, further comprising:

the input ends of the two optical couplers (61, 71) are respectively connected with two pins of the micro control unit (10); and

two relay drivers (62, 72) with input terminals connected to the output terminals of the two optocouplers (61, 71), respectively, and output terminals connected to the coils of the relays K6 and K7, respectively,

the micro control unit (10) controls the energization and the de-energization of the coils of the relays K6 and K7 by controlling the on and off of the two optocouplers (61, 71).

15. The new energy vehicle charging control device according to claim 12, characterized in that:

the resistance values of the voltage dividing resistors R1, R2, R3 and R4 are equal to 1.7M omega, the resistance value of the voltage dividing resistor R5 is equal to 34K omega, and the capacitance value of the high-voltage isolation capacitor C3 is equal to 100uF.

16. The new energy vehicle charging control device according to claim 11, characterized in that:

the relay state detection module comprises communication devices (11 and 12) connected with the micro control unit (10), and the communication devices (11 and 12) are used for transmitting information of whether the on-off states of the relays K6 and K7 judged by the micro control unit (10) are abnormal or not and voltage information between the anode and the cathode of the charging pile detected by the voltage detection module to an electric control unit of the new energy vehicle.

17. A control box, comprising:

a box body; and

the new energy vehicle charging control device of any one of claims 9-16, mounted in the cartridge.

18. The control box according to claim 17, wherein:

the new energy vehicle charging control device is integrated on a circuit board, and the circuit board is installed in the box body.