New energy automobile and insulation control device for circuit system and accessories of new energy automobile

Abstract

The utility model discloses a new energy automobile and an insulation control device for a circuit system and accessories thereof, and relates to the technical field of automobile insulation control. The power management chip and the communication chip are electrically connected to the main control chip; the low-voltage control interface is electrically connected to the main control chip, the power management chip and the communication chip; the positive current detection module and the negative current detection module are electrically connected to the main control chip; the positive electrode relay is electrically connected to the main control chip and the positive electrode current detection module, the negative electrode relay is electrically connected to the main control chip and the negative electrode current detection module, the high-voltage input interface is electrically connected to the positive electrode current detection module and the negative electrode current detection module, and the high-voltage output interface is electrically connected to the positive electrode relay and the negative electrode relay. The low-voltage control interface electrically connects the power management chip to a vehicle power supply. The communication chip is electrically connected to the CAN bus through the low-voltage control interface. And the main control chip receives a trigger signal and sends an enable control signal through the low-voltage control interface.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile insulation control technology, specifically, a new energy automobile and the insulation control device of circuit system and accessory thereof. BACKGROUND

[0002] The B-grade circuit of the new energy automobile is usually configured with an insulation detection device, which can detect the state of the high-voltage circuit in real time when the vehicle is running, effectively avoiding safety hazards such as vehicle leakage and electric shock. The new energy electrical accessory system includes components such as electric heating air, electric air conditioner, and refrigeration unit. It is usually connected to the power battery through direct connection or positive series connection of relays. The battery management system (BMS) in the power battery system is responsible for collecting the insulation resistance of the high-voltage loop and performing insulation resistance detection to ensure the safe operation of the circuit system.

[0003] However, there are some significant defects in the prior art. There are many high-voltage components on the new energy automobile, including power batteries, drive motors, motor controllers, DC / DC, on-board chargers, air conditioner compressors, etc. These components are connected in parallel in the power battery loop, and the BMS insulation control device monitors the total insulation resistance of the entire system. Once any component in the system is abnormal, it will trigger a vehicle insulation fault and may cause the vehicle to enter a limited power or stop mode. In particular, the failure of electrical accessories such as air conditioner compressors on commercial vehicles can seriously affect the operation of the vehicle. For example, the internal components of the air conditioner compressor operate in a high-temperature and high-pressure environment, which can cause damage to components, moisture in refrigerant, and other problems, resulting in abnormal insulation values. Once these accessories fail, due to the high-voltage direct connection or common negative electrical connection structure, it may cause the entire vehicle to fail, making the vehicle unable to operate normally, causing great inconvenience to the operation, and increasing maintenance costs.

[0004] In addition, the insulation detection device in the prior art usually lacks detailed monitoring and protection of individual electrical accessories. When a certain electrical accessory has insulation, overcurrent, overvoltage, or other faults, the entire high-voltage system may be affected, resulting in unnecessary downtime and maintenance. This not only affects the operational efficiency of the vehicle, but also increases operating costs due to frequent maintenance. Therefore, there is an urgent need for a technical solution that can independently control the insulation of new energy commercial vehicle electrical accessories to improve the operational reliability and efficiency of the vehicle. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of insulation control device of new energy automobile and its circuit system and accessory, to improve at least one of the above technical problems.

[0006] To solve the above technical problems, the utility model provides an accessory's insulation control device of new energy automobile, it contains main control chip, power management chip and communication chip of electric connection in main control chip, low pressure control interface of electric connection in main control chip, power management chip and communication chip, positive pole current detection module and negative pole current detection module of electric connection in main control chip, positive pole relay of electric connection in main control chip and positive pole current detection module, negative pole relay of electric connection in main control chip and negative pole current detection module, high voltage input interface of electric connection in positive pole current detection module and negative pole current detection module, high voltage output interface of electric connection in positive pole relay and negative pole relay.

[0007] The low voltage control interface is suitable for electrically connecting the power management chip to a vehicle ON power supply, a vehicle BATT power supply and a vehicle ACC power supply. The low voltage control interface is suitable for electrically connecting the communication chip to a vehicle CAN bus. The main control chip is suitable for receiving a trigger signal through the low voltage control interface, and is suitable for sending an enable control signal through the low voltage control interface. The high voltage input interface is suitable for electrically connecting input ends of the positive pole relay and the negative pole relay to a power supply distribution module of a power battery. The high voltage output interface is suitable for electrically connecting output ends of the positive pole relay and the negative pole relay to an electrical accessory of an automobile.

[0008] As a further scheme of the utility model, a VIN pin of the power management chip is grounded through a series connection of a voltage stabilizing diode Z1, a capacitor C1 and a capacitor C2. The VIN pin of the power management chip is electrically connected to a cathode of a diode D1. An anode of the diode D1 is suitable for being electrically connected to the vehicle BATT power supply through the low voltage control interface. An ON / OFF pin of the power management chip is electrically connected to the VIN pin of the power management chip through a resistor R10. The ON / OFF pin of the power management chip is electrically connected to a current input end of a triode Q7. A control end of the triode Q7 is electrically connected to a cathode of a diode D8 through a series connection of a resistor R11. An anode of the diode D8 is suitable for being electrically connected to the vehicle ON power supply through the low voltage control interface. The current output end of the triode Q7 is grounded. An OUT pin of the power management chip is output as a VDD power supply through an inductor L1. One end of the inductor L1 close to the OUT pin of the power management chip is grounded through a voltage stabilizing diode Z2. One end of the inductor L1 away from the OUT pin of the power management chip is grounded through a capacitor C3. A FB pin of the power management chip is electrically connected to one end of the inductor L1 away from the OUT pin of the power management chip. A GND pin of the power management chip is grounded.

[0009] As a further scheme of the utility model, the CAN H pin of the communication chip is adapted to be connected to the CAN H cable of the vehicle through the low-voltage control interface. The CAN H pin of the communication chip is electrically connected to the first end of the capacitor C6 through the resistor R1. The second end of the capacitor C6 is grounded. The CAN L pin of the communication chip is adapted to be connected to the CAN L cable of the vehicle through the low-voltage control interface. The CAN L pin of the communication chip is electrically connected to the first end of the capacitor C6 through the resistor R2. The VDD pin of the communication chip is electrically connected to the cathode of the diode D2. The anode of the diode D2 is electrically connected to the VDD power supply. The VDD pin of the communication chip is grounded through the parallel connection of the capacitor C4 and the capacitor C5. The TXD pin of the communication chip is electrically connected to the TXD pin of the main control chip. The STB pin of the communication chip is electrically connected to the STB pin of the main control chip. The RXD pin of the communication chip is electrically connected to the RXD pin of the main control chip.

[0010] As a further scheme of the utility model, the OUT+ pin of the main control chip is electrically connected to the control end of the triode Q1 through the resistor R3. The control end of the triode Q1 is grounded through the resistor R4. The current input end of the triode Q1 is adapted to be electrically connected to the vehicle BATT power supply. The current output end of the triode Q1 is adapted to be electrically connected to the control end of the positive relay. The current output end of the triode Q1 is electrically connected to the cathode of the diode D5. The anode of the diode D5 is grounded. The OUT- pin of the main control chip is electrically connected to the control end of the triode Q2 through the resistor R5. The control end of the triode Q2 is grounded through the resistor R6. The current input end of the triode Q2 is adapted to be electrically connected to the vehicle BATT power supply. The current output end of the triode Q2 is adapted to be electrically connected to the control end of the negative relay. The current output end of the triode Q2 is electrically connected to the cathode of the diode D6. The anode of the diode D6 is grounded.

[0011] As a further scheme of the utility model, the AD+ pin of the main control chip is electrically connected to the positive current detection module. The AD- pin of the main control chip is electrically connected to the negative current detection module. The REGC pin and the ON pin of the main control chip form a power reset circuit with an external circuit. The external circuit includes a resistance R9 connected between a VDD power supply and the ON pin of the main control chip, and a capacitor C7, a capacitor C8, a capacitor C9 and a capacitor C10. The first end of the capacitor C10 is electrically connected to the REGC pin of the main control chip. The second end of the capacitor C10 is grounded. One end of the capacitor C7, the capacitor C8 and the capacitor C9 is electrically connected to the VDD power supply, and the other end is grounded. The ACC pin of the main control chip is electrically connected to the current input end of the transistor Q4. The ACC pin of the main control chip is electrically connected to the VDD power supply through the resistance R19. The control end of the transistor Q4 is adapted to be electrically connected to the vehicle ACC power supply through the series connection of the resistance R20, the diode D12 and the resistance R21. The current output end of the transistor Q4 is grounded. The AC pin of the main control chip is electrically connected to the current input end of the transistor Q6. The AC pin of the main control chip is electrically connected to the VDD power supply through the resistance R13. The control end of the transistor Q6 is adapted to receive a trigger signal through the series connection of the resistance R14, the diode D10, the resistance R15 and the low-voltage control interface. The current output end of the transistor Q6 is grounded. The ET pin of the main control chip is electrically connected to the low-voltage control interface and is adapted to send an enable control signal through the low-voltage control interface.

[0012] As a further scheme of the utility model, the insulation control device further includes a shell and a PCB control board connected to the shell. The power management chip, the communication chip, the main control chip, the positive current detection module, the negative current detection module, the positive relay and the negative relay are connected to the PCB control board. The low-voltage control interface, the high-voltage input interface and the high-voltage output interface are connected to the shell or connected to the shell through a connecting line.

[0013] As a further scheme of the utility model, the insulation control device further includes a fixing bracket adapted to connect the shell to the automobile, a detachable end cover connected to the shell, a fastening bolt adapted to fix the end cover to the shell, a sealing ring connected between the shell and the end cover, a breather valve connected to the end cover, and a connecting line extending outward from the end cover to connect the high-voltage input interface or the high-voltage output interface. The shell is provided with a slot for sliding the PCB control board. The model of the power management chip is XL1509. The model of the communication chip is TJA1044. The model of the main control chip is R5F10BB.

[0014] The application further provides a circuit system of a new energy vehicle, which comprises a power distribution component and the insulation control device of the accessory of the new energy vehicle.

[0015] The application further provides a new energy vehicle, which comprises the circuit system of the new energy vehicle or the insulation control device of the accessory of the new energy vehicle.

[0016] By adopting the technical scheme, the following technical effects can be achieved.

[0017] The insulation control device of the accessory of the new energy vehicle is used for connecting the power distribution component and the electrical accessory of the new energy vehicle. The device can automatically detect whether the new energy electrical accessory circuit is in an abnormal state such as overcurrent, overvoltage or insulation. When an abnormal condition is detected, the device can automatically cut off the high-voltage positive and negative loop of the electrical accessory according to a preset power-on and power-off process, so that each electrical accessory component is separated from the new energy high-voltage system. This design ensures that the vehicle can still maintain normal driving when a fault occurs, thereby guaranteeing the operation demand of the commercial vehicle and reducing the risk of vehicle stop caused by electrical accessory failure. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the specific embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, it should be understood, the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation of the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0019] Figure 1 It is a structural schematic diagram of the circuit system of a new energy vehicle.

[0020] Figure 2 It is an isometric view of the insulation control device.

[0021] Figure 3 It is an exploded view of the insulation control device.

[0022] Figure 4 It is a circuit diagram of the insulation control device.

[0023] Figure 5 It is a circuit connection diagram of the communication chip.

[0024] Figure 6 It is a circuit connection diagram of the power management chip.

[0025] Figure 7 This is the circuit connection diagram of the main control chip.

[0026] The markings in the diagram are: Z1 - housing, Z2 - low-voltage control interface, Z3 - PCB control board, Z4 - sealing ring, Z5 - end cap, Z6 - fastening bolt, Z7 - connecting wire, Z8 - vent valve, Z9 - high-voltage input interface, Z10 - mounting bracket, U1 - power management chip, U2 - communication chip, U3 - main control chip. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] Example 1, by Figures 1 to 7 As shown, this utility model embodiment provides an insulation control device for an accessory of a new energy vehicle, which includes a main control chip U3, a power management chip U1 and a communication chip U2 electrically connected to the main control chip U3, a low-voltage control interface Z2 electrically connected to the main control chip U3, the power management chip U1 and the communication chip U2, a positive current detection module and a negative current detection module electrically connected to the main control chip U3, a positive relay electrically connected to the main control chip U3 and the positive current detection module, a negative relay electrically connected to the main control chip U3 and the negative current detection module, a high-voltage input interface Z9 electrically connected to the positive current detection module and the negative current detection module, and a high-voltage output interface electrically connected to the positive relay and the negative relay.

[0029] The low-voltage control interface Z2 is adapted to electrically connect the power management chip U1 to a vehicle ON power supply, a vehicle BATT power supply and a vehicle ACC power supply. The low-voltage control interface Z2 is adapted to electrically connect the communication chip U2 to a vehicle CAN bus. The main control chip U3 is adapted to receive a trigger signal through the low-voltage control interface Z2 and to send an enable control signal through the low-voltage control interface Z2. As shown in Figure 4 The left side 1 to 12 are 12 pins (i.e., a first pin to a twelfth pin) of the low-voltage control interface Z2.

[0030] The high-voltage input interface Z9 is adapted to electrically connect input ends of the positive relay and the negative relay to a power distribution module of a power battery. As shown in Figure 4 The right side A and D are 2 pins (i.e., a pin A and a pin D) of the high-voltage input interface Z9.

[0031] The high-voltage output interface is adapted to electrically connect output ends of the positive relay and the negative relay to electrical accessories of an automobile. As shown in Figure 4 The right side B and C are 2 pins (i.e., a pin B and a pin C) of the high-voltage output interface.

[0032] A whole vehicle implementation process is as follows: the high-voltage input interface Z9 of the insulation control device is connected to a whole vehicle power distributor, and the high-voltage output interface is connected to electrical accessories such as an electric heater, an electric air conditioner and a refrigeration unit. When the whole vehicle is normally running, the inside of the insulation control device is in a communication state, at this time, the power battery power supply is output to the motor controller and the driving motor through the power distribution component, to drive the vehicle to run. On the other hand, the power battery power supply is output to the electrical accessories such as the electric heater, the electric air conditioner and the refrigeration unit through the insulation control device, to realize a vehicle auxiliary function. When the whole vehicle electrical accessories appear insulation, overcurrent, overvoltage and other faults, the insulation control device cuts off the electrical accessories and the whole vehicle high-voltage line by closing the two groups of high-voltage relays inside, to realize isolation of the vehicle power and the accessory two sets of systems, to guarantee the vehicle to maintain the running function.

[0033] The insulation control device of the accessory of the new energy vehicle is used for connecting a power distribution power distribution component and electrical accessories of the new energy vehicle. The insulation control device can automatically detect whether the new energy electrical accessory line is in an overcurrent, overvoltage or insulation abnormal state. When the abnormal condition is detected, the device can automatically cut off the high-voltage positive and negative loops of the electrical accessories according to a preset power-on and power-off process, to make each electrical accessory component separate from the new energy high-voltage system. This design ensures that the vehicle can still maintain normal driving when a fault occurs, to guarantee the operation demand of the commercial vehicle and reduce the vehicle stoppage risk caused by the electrical accessory fault.

[0034] On the basis of the above embodiment, in an optional embodiment of the utility model, as shown in Figure 4and Figure 5 As shown, the VIN pin of the power management chip U1 is grounded through a parallel connection of a Zener diode Z1, capacitor C1, and capacitor C2. The VIN pin of the power management chip U1 is electrically connected to the cathode of diode D1. The anode of diode D1 is adapted to be electrically connected to the vehicle's BATT power supply through the low-voltage control interface Z2. The ON / OFF pin of the power management chip U1 is electrically connected to the VIN pin of the power management chip U1 through a resistor R10. The ON / OFF pin of the power management chip U1 is electrically connected to the current input terminal of transistor Q7. The control terminal of transistor Q7 is electrically connected to the cathode of diode D8 through a series resistor R11. The anode of diode D8 is adapted to be electrically connected to the vehicle's ON power supply through the low-voltage control interface Z2. The current output terminal of transistor Q7 is grounded. The OUT pin of the power management chip U1 outputs VDD power through inductor L1. The end of inductor L1 closest to the OUT pin of the power management chip U1 is grounded through a Zener diode Z2. The end of inductor L1 furthest from the OUT pin of power management chip U1 is grounded through capacitor C3. The FB pin of power management chip U1 is electrically connected to the end of inductor L1 furthest from the OUT pin of power management chip U1. The GND pin of power management chip U1 is grounded.

[0035] like Figure 4 and Figure 5 As shown, the vehicle's battery power (i.e., BATT power) is connected to the fifth pin of the low-voltage control interface Z2 of the insulation control device, and enters the internal power management chip U1. The vehicle's BATT power is rectified and filtered by the front-end circuit before entering the VIN pin of the power management chip U1.

[0036] The vehicle's ON power supply is connected to the internal protection circuit of the insulation control device via the fourth pin of the low-voltage control interface Z2. This drives transistor Q7 to control the voltage of the ON / OFF interface of the power management chip U1. Combined with the feedback voltage of the FB interface of the power management chip U1, the chip internally achieves fixed-frequency pulse-width modulation (PWM) step-down. After shaping by inductor L1 and capacitor C3 in the subsequent circuit, the OUT interface of the power management chip U1 outputs the operating power VDD required by the internal circuits of the device.

[0037] Based on the above embodiments, in an optional embodiment of the present invention, such as... Figure 4 and Figure 6As shown, the CAN H pin of the communication chip U2 is adapted to be connected to the CAN H cable of the vehicle through the low-voltage control interface Z2. The CAN H pin of the communication chip U2 is electrically connected to the first end of the capacitor C6 through the resistor R1. The second end of the capacitor C6 is grounded. The CAN L pin of the communication chip U2 is adapted to be connected to the CAN L cable of the vehicle through the low-voltage control interface Z2. The CAN L pin of the communication chip U2 is electrically connected to the first end of the capacitor C6 through the resistor R2. The VDD pin of the communication chip U2 is electrically connected to the cathode of the diode D2. The anode of the diode D2 is electrically connected to the VDD power supply. The VDD pin of the communication chip U2 is grounded through the parallel connection of the capacitor C4 and the capacitor C5. The TXD pin of the communication chip U2 is electrically connected to the TXD pin of the main control chip U3. The STB pin of the communication chip U2 is electrically connected to the STB pin of the main control chip U3. The RXD pin of the communication chip U2 is electrically connected to the RXD pin of the main control chip U3.

[0038] As shown in Figure 4 and Figure 6 The CAN H cable, the CAN L cable and the CAN shield cable of the vehicle are respectively connected to the first pin, the seventh pin and the second pin of the low-voltage control interface Z2 of the insulation control device. The vehicle CAN signal is input to the CAN H pin and the CAN L pin of the internal communication chip U2 and is parsed into TXD, STB and RXD signals and is transmitted to the TXD pin, the RXD pin and the STB pin of the main control chip U3. Then the vehicle CAN signal is read by the main control chip U3, the system operation states of the vehicle power battery, the power distribution and the electrical accessories are parsed to identify the information of the vehicle operation state, the insulation fault and the accessory control. Meanwhile, the communication instruction output by the main control chip U3 is also compiled and sent to the vehicle CAN network through the communication chip U2.

[0039] On the basis of the above embodiment, in an optional embodiment of the utility model, as shown in Figure 4 and Figure 7 The OUT+ pin of the main control chip U3 is electrically connected to the control end of the triode Q1 through the resistor R3. The control end of the triode Q1 is grounded through the resistor R4. The current input end of the triode Q1 is adapted to be electrically connected to the vehicle BATT power supply. The current output end of the triode Q1 is adapted to be electrically connected to the control end of the positive relay. The current output end of the triode Q1 is electrically connected to the cathode of the diode D5. The anode of the diode D5 is grounded.

[0040] The OUT- pin of the main control chip U3 is electrically connected to the control end of the transistor Q2 through the resistor R5. The control end of the transistor Q2 is grounded through the resistor R6. The current input end of the transistor Q2 is adapted to be electrically connected to the vehicle BATT power supply. The current output end of the transistor Q2 is adapted to be electrically connected to the control end of the negative electrode relay. The current output end of the transistor Q2 is electrically connected to the cathode of the diode D6. The anode of the diode D6 is grounded.

[0041] Preferably, the AD+ pin of the main control chip U3 is electrically connected to the positive electrode current detection module. The AD- pin of the main control chip U3 is electrically connected to the negative electrode current detection module.

[0042] As shown in Figure 1 , Figure 4 and Figure 7 The high-voltage input interface Z9 electrically connects the input ends of the positive electrode relay and the negative electrode relay to the power distribution component of the vehicle.

[0043] The high-voltage positive electrode output by the power distribution component of the vehicle is input by the pin A of the high-voltage input interface Z9 of the insulation control device. The high-voltage positive electrode passes through the positive electrode current detection module inside the device, and the linear Hall sensor cooperates with the follow-up operational amplifier circuit to convert the total positive electrode current of the electrical accessory into a stable output voltage value AD+, which is fed back to the AD+ pin of the main control chip U3 for overcurrent detection. At the same time, the high-voltage positive electrode is connected to the input pin of the positive electrode relay, the OUT+ pin of the main control chip U3 controls the conduction of the transistor Q1, drives the positive electrode relay to close, and outputs from the output pin of the positive electrode relay to the pin B of the high-voltage output interface of the insulation control device, to provide the positive electrode power supply for the electrical accessories of the whole vehicle.

[0044] The high-voltage negative electrode output by the power distribution component of the vehicle is input by the pin D of the high-voltage input interface Z9 of the insulation control device. The high-voltage negative electrode passes through the negative electrode current detection module inside the device, and the linear Hall sensor cooperates with the follow-up operational amplifier circuit to convert the total negative electrode current of the electrical accessory into a stable output voltage value AD-, which is fed back to the AD- pin of the main control chip U3 for overcurrent detection. At the same time, the high-voltage negative electrode is connected to the input pin of the negative electrode relay, the OUT- pin of the main control chip U3 controls the conduction of the transistor Q2, drives the negative electrode relay to close, and outputs from the output pin of the negative electrode relay to the pin C of the high-voltage output interface of the insulation control device, to provide the negative electrode power supply for the electrical accessories of the whole vehicle.

[0045] On the basis of the above-mentioned embodiments, in an optional embodiment of the utility model, as shown in Figure 4 and Figure 7As shown, the REGC pin and the ON pin of the main control chip U3 are connected with an external circuit to form a power reset circuit. The external circuit includes a resistor R9 connected between the VDD power supply and the ON pin of the main control chip U3, and capacitors C7, C8, C9 and C10. The first end of the capacitor C10 is electrically connected to the REGC pin of the main control chip U3. The second end of the capacitor C10 is grounded. One end of the capacitors C7, C8 and C9 is electrically connected to the VDD power supply, and the other end is grounded.

[0046] The ACC pin of the main control chip U3 is electrically connected to the current input end of the transistor Q4. The ACC pin of the main control chip U3 is electrically connected to the VDD power supply through the resistor R19. The control end of the transistor Q4 is adapted to be electrically connected to the vehicle ACC power supply through the resistors R20 and R21 and the diode D12 arranged in series. The current output end of the transistor Q4 is grounded.

[0047] Specifically, the REGC pin and the ON pin of the main control chip U3 are connected with an external circuit to form a power reset circuit. The ACC power supply of the tenth pin of the low-voltage control interface Z2 of the insulation control device is connected to the transistor Q4 to realize the sleep and wake-up of the insulation control device.

[0048] On the basis of the above embodiment, in an optional embodiment of the utility model, Figure 4 and Figure 7 As shown, the AC pin of the main control chip U3 is electrically connected to the current input end of the transistor Q6. The AC pin of the main control chip U3 is electrically connected to the VDD power supply through the resistor R13. The control end of the transistor Q6 is adapted to receive a trigger signal through the resistors R14 and R15, the diode D10 and the low-voltage control interface Z2 arranged in series. The current output end of the transistor Q6 is grounded.

[0049] The AC trigger signal (signal trigger) input to the twelfth pin of the low-voltage control interface Z2 of the insulation control device is matched with the electric appliance accessory to judge the vehicle insulation value, the power distribution component working time sequence and the electric appliance accessory demand. When the data is within the control limit value, the main control chip U3 controls the transistors Q1 and Q2 according to the designed time sequence to drive the positive and negative relays to be closed, and the pins B and C of the high-voltage output interface of the insulation control device output the positive and negative power supplies to drive the electric appliance accessory system.

[0050] On the basis of the above embodiment, in an optional embodiment of the utility model, Figure 4 and Figure 7 As shown, the ET pin of the main control chip U3 is electrically connected to the low-voltage control interface Z2 and is adapted to send an enable control signal through the low-voltage control interface Z2.

[0051] The ET pin of the main control chip U3 controls the driving circuit through the ET signal, and the sixth pin of the low-voltage control interface Z2 of the insulation control device outputs an enable control to the electric appliance accessory system, so that the electric appliance accessory system runs.

[0052] When the circuit system of the new energy vehicle works normally, the detection voltages AD+ and AD- of the positive and negative current detection modules are transmitted to the AD+ pin and the AD- pin of the main control chip U3. The main control chip U3 enters a detection state, and if the above detection values (i.e., the vehicle electric appliance accessory operation request is judged according to the AC trigger signal (signal trigger), and the whole vehicle fault information and the insulation value are judged according to the CAN data analysis of the communication chip U2) exceed the limit value, the main control chip U3 sends the electric appliance accessory shutdown instruction through the ET enable voltage of the ET pin and the CAN data of the communication chip U2 in turn. The positive and negative relays under the control of the triode Q1 and the triode Q2 are closed in sequence, so that the high-voltage input of the electric appliance accessory system is cut off. At this time, the device enters a fault mode, sends the CAN fault data to the whole vehicle control system and the instrument, and the whole vehicle enters a fault grading mode, and the electric appliance accessory protection strategy is started.

[0053] And the new energy vehicle can send a repair instruction to the Internet of Vehicles platform through a remote communication terminal (TBOX terminal), and the instrument displays prompt information for the driver and passenger to repair in time. The fault mode will be automatically continued until the RESET pin of the main control chip U3 receives the RESET reset voltage of the third pin of the low-voltage control interface Z2 of the insulation control device. The voltage is triggered by the repaired maintenance equipment, and the main control chip U3 can also automatically reset by identifying the number of on-off times of the ignition switch in a unit time, so as to facilitate the temporary treatment of the driver to the fault vehicle.

[0054] On the basis of the above embodiment, in an optional embodiment of the utility model, Figure 2 And Figure 3As shown, the insulation control device further comprises a housing Z1, and a PCB control board Z3 engaged with the housing Z1. The power management chip U1, the communication chip U2, the main control chip U3, the positive current detection module, the negative current detection module, the positive relay and the negative relay are engaged with the PCB control board Z3. The low-voltage control interface Z2, the high-voltage input interface Z9 and the high-voltage output interface are engaged with the housing Z1, or are engaged with the housing Z1 through the connecting line Z7. Preferably, the insulation control device further comprises a fixing support Z10 adapted to engage the housing Z1 with the automobile, a end cover Z5 detachably engaged with the housing Z1, a fastening bolt Z6 adapted to fix the end cover Z5 to the housing Z1, a sealing ring Z4 engaged between the housing Z1 and the end cover Z5, a breather valve Z8 engaged with the end cover Z5, and a connecting line Z7 extending outward from the end cover Z5 to connect the high-voltage input interface Z9 or the high-voltage output interface.

[0055] Specifically, the housing Z1 is provided with a slot for the PCB control board Z3 to slide in. As shown in Figure 2 and Figure 3 As shown, the insulation control device is designed as an IP68 protection level cast housing Z1. The high-voltage interface and the breather valve Z8 are arranged on the outer side of the end cover Z5, and the PCB circuit board is clamped on the inner side. The housing Z1 is designed with a slot structure on the inner wall, and when the PCB board is inserted into the slot, the end cover Z5 is also pushed into the housing Z1 at the same time. A double-layer temperature-resistant fluororubber ring (i.e. the sealing ring Z4) is designed on the outer wall of the end cover Z5, realizing the axial sealing of the two parts of the housing Z1 and the end cover Z5. The housing Z1 is designed with a reinforcing rib structure with a clamping groove on the inside of the four edges, which can clamp the standard fixing support Z10 in cooperation with the limiting clamping point in the middle.

[0056] The PCB control board Z3 is constructed as a double-layer PCB compact design. The insulation control circuit is composed of a low-voltage control communication circuit, a high-voltage detection circuit and a high-voltage control circuit. According to the difference of the working voltage of each circuit, the circuit board is divided into two areas of high-voltage and low-voltage, and the electronic components are arranged considering the high-voltage insulation and electromagnetic interference factors: through the double-layer PCB compact design cooperating with the slot structure, the creepage distance and the heat dissipation capacity of the power components can be increased, and the circuit is designed with common ground and shielding, improving the electromagnetic anti-interference ability of the device.

[0057] The low-voltage control communication circuit is composed of a power management chip U1, a main control chip U3, a communication chip U2 and several parts. The power management chip U1 is a 150KHz fixed frequency pulse width modulation (buck type) DC / DC converter, with built-in frequency compensation and fixed frequency oscillator to reduce external components. The main control chip U3 is a 16-bit single-chip microprocessor with a system clock of 32MHz. The communication chip U2 is a high-speed CAN bus transceiver supporting bus wake-up and low-power standby mode.

[0058] Preferably, the model of the power management chip U1 is XL1509. The model of the communication chip U2 is TJA1044. The model of the main control chip U3 is R5F10BB. In other embodiments, the power management chip U1, the communication chip U2 and the main control chip U3 can also use other existing chip models, and the utility model does not make specific limitation to this.

[0059] The high-voltage circuit is composed of a positive relay, a negative relay, a positive current detection module and a negative current detection module. The current detection module is composed of a high-precision, low-offset linear Hall sensor circuit, with a bandwidth of 120KHz and an internal resistance of 100muOmega, low power loss, and cooperates with a voltage following operational amplifier circuit to output stability. The high-voltage switching uses a high-voltage relay with a withstand voltage of 750V and a switching power of 20kw.

[0060] Specifically, the insulation control device is designed with two groups of high-voltage relays required by the electrical accessories, which can realize the physical connection or disconnection of the electrical accessories and the power battery loop. The insulation control device is also designed with a CAN communication circuit, which can identify the running state of the whole vehicle and the insulation fault, and control the timing relationship of the whole vehicle power distribution and the device power control. The insulation control device is also designed with an internal control circuit, which can realize the timing relationship of the mutual work of the two groups of relays. The insulation control device connects the vehicle electrical accessory line, which can identify the running state of the vehicle and interactively control the function of the electrical accessories. The insulation control device is also designed with an independent detection circuit, which can monitor the current, voltage, temperature and other states of the electrical accessory circuit. The insulation control device is also designed with a reset circuit, which can realize the function of fast power-on and power-off times or line reset. The insulation control device is also designed with a self-diagnosis system, which can realize the functions of fault diagnosis, alarm prompt and data uploading.

[0061] The insulation control device of the utility model is connected in series in the high-voltage line of the vehicle. And it automatically detects whether the new energy electrical accessory line is in the overcurrent, overvoltage, insulation and other states. When the abnormality is detected, the insulation control device will automatically cut off the high-voltage positive and negative loop of the electrical accessories according to the power-on and power-off process, so that each electrical accessory component is separated from the new energy high-voltage system, ensuring that the vehicle can still run normally after the fault, and maintaining the customer's operation demand. At the same time, the device records the fault information and prompts the customer to repair the information in time on the instrument and diagnostic equipment. After the vehicle is repaired, the device can be reset by the driver's operation trigger or the maintenance hard-wire trigger mode, and the vehicle electrical accessory function is restored.

[0062] In the second embodiment, the application further provides a circuit system of a new energy vehicle, which comprises a power distribution component and the insulation control device for accessories of a new energy vehicle according to the first embodiment. The power distribution component is adapted to distribute the electric energy provided by the power battery of the vehicle to the insulation control device and a motor controller of the vehicle. The insulation control device is adapted to be electrically connected to the electrical accessories of the vehicle.

[0063] As shown in Figure 1 the battery, a direct current charging seat electrically connected to the battery, an alternating current charging seat electrically connected to the power distribution component, a motor controller electrically connected to the power distribution component, a driving motor electrically connected to the motor controller, an air conditioner compressor electrically connected to the insulation control device, an electric heater and a refrigeration unit.

[0064] In the third embodiment, the application further provides a new energy vehicle, which comprises the circuit system of a new energy vehicle according to the second embodiment or the insulation control device for accessories of a new energy vehicle according to the first embodiment.

[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An insulation control device for an accessory of a new energy vehicle, characterized in that, It includes a main control chip (U3), a power management chip (U1) and a communication chip (U2) electrically connected to the main control chip (U3), a low-voltage control interface (Z2) electrically connected to the main control chip (U3), the power management chip (U1) and the communication chip (U2), a positive current detection module and a negative current detection module electrically connected to the main control chip (U3), a positive relay electrically connected to the main control chip (U3) and the positive current detection module, a negative relay electrically connected to the main control chip (U3) and the negative current detection module, a high-voltage input interface (Z9) electrically connected to the positive current detection module and the negative current detection module, and a high-voltage output interface electrically connected to the positive relay and the negative relay. The low-voltage control interface (Z2) is adapted to electrically connect the power management chip (U1) to the vehicle ON power supply, the vehicle BATT power supply, and the vehicle ACC power supply; the low-voltage control interface (Z2) is adapted to electrically connect the communication chip (U2) to the vehicle CAN bus; the main control chip (U3) is adapted to receive trigger signals through the low-voltage control interface (Z2) and to issue enable control signals through the low-voltage control interface (Z2); The high-voltage input interface (Z9) is adapted to electrically connect the input terminals of the positive relay and the negative relay to the power distribution module of the power battery; The high-voltage output interface is adapted to electrically connect the output terminals of the positive relay and the negative relay to the electrical accessories of the vehicle.

2. The insulation control device for an accessory of a new energy vehicle according to claim 1, characterized in that, The VIN pin of the power management chip (U1) is grounded through a Zener diode Z1, a capacitor C1, and a capacitor C2 connected in parallel; the VIN pin of the power management chip (U1) is electrically connected to the cathode of diode D1; the anode of diode D1 is adapted to be electrically connected to the vehicle's BATT power supply through a low-voltage control interface (Z2). The ON / OFF pin of the power management chip (U1) is electrically connected to the VIN pin of the power management chip (U1) through resistor R10; the ON / OFF pin of the power management chip (U1) is electrically connected to the current input terminal of transistor Q7; the control terminal of transistor Q7 is electrically connected to the cathode of diode D8 through resistor R11 connected in series; the anode of diode D8 is adapted to be electrically connected to the vehicle's ON power supply through the low-voltage control interface (Z2); the current output terminal of transistor Q7 is grounded; The OUT pin of the power management chip (U1) outputs VDD power through inductor L1; the end of inductor L1 closest to the OUT pin of the power management chip (U1) is grounded through Zener diode Z2; the end of inductor L1 furthest from the OUT pin of the power management chip (U1) is grounded through capacitor C3. The FB pin of the power management chip (U1) is electrically connected to the end of the inductor L1 that is away from the OUT pin of the power management chip (U1); The GND pin of the power management chip (U1) is grounded.

3. The insulation control device for an accessory of a new energy vehicle according to claim 1, characterized in that, The CAN H pin of the communication chip (U2) is adapted to be connected to the vehicle's CAN H cable via a low-voltage control interface (Z2); the CAN H pin of the communication chip (U2) is electrically connected to the first end of the capacitor C6 via a resistor R1; the second end of the capacitor C6 is grounded. The CAN L pin of the communication chip (U2) is adapted to be connected to the CAN L cable of the vehicle via the low-voltage control interface (Z2); the CAN L pin of the communication chip (U2) is electrically connected to the first end of the capacitor C6 via resistor R2. The VDD pin of the communication chip (U2) is electrically connected to the cathode of diode D2; the anode of diode D2 is electrically connected to the VDD power supply; the VDD pin of the communication chip (U2) is grounded through capacitors C4 and C5 connected in parallel. The TXD pin of the communication chip (U2) is electrically connected to the TXD pin of the main control chip (U3); The STB pin of the communication chip (U2) is electrically connected to the STB pin of the main control chip (U3); The RXD pin of the communication chip (U2) is electrically connected to the RXD pin of the main control chip (U3).

4. The insulation control device for an accessory of a new energy vehicle according to claim 1, characterized in that, The OUT+ pin of the main control chip (U3) is electrically connected to the control terminal of transistor Q1 through resistor R3; the control terminal of transistor Q1 is grounded through resistor R4; the current input terminal of transistor Q1 is suitable for electrical connection to the vehicle BATT power supply; the current output terminal of transistor Q1 is suitable for electrical connection to the control terminal of the positive relay; the current output terminal of transistor Q1 is electrically connected to the cathode of diode D5; the anode of diode D5 is grounded. The OUT- pin of the main control chip (U3) is electrically connected to the control terminal of transistor Q2 through resistor R5; the control terminal of transistor Q2 is grounded through resistor R6; the current input terminal of transistor Q2 is suitable for electrical connection to the vehicle BATT power supply; the current output terminal of transistor Q2 is suitable for electrical connection to the control terminal of the negative relay; the current output terminal of transistor Q2 is electrically connected to the cathode of diode D6; the anode of diode D6 is grounded.

5. An insulation control device for an accessory of a new energy vehicle according to claim 1, characterized in that, The AD+ pin of the main control chip (U3) is electrically connected to the positive current detection module; The AD-pin of the main control chip (U3) is electrically connected to the negative current detection module.

6. The insulation control device for an accessory of a new energy vehicle according to claim 1, characterized in that, The external circuitry of the REGC and ON pins of the main control chip (U3) forms a power reset circuit. The external circuitry includes a resistor R9 connected between the VDD power supply and the ON pin of the main control chip (U3), and capacitors C7, C8, C9, and C10. The first end of capacitor C10 is electrically connected to the REGC pin of the main control chip (U3), and the second end of capacitor C10 is grounded. One end of capacitors C7, C8, and C9 is electrically connected to the VDD power supply, and the other end is grounded. The ACC pin of the main control chip (U3) is electrically connected to the current input terminal of the transistor Q4; the ACC pin of the main control chip (U3) is electrically connected to the VDD power supply through resistor R19; the control terminal of the transistor Q4 is adapted to be electrically connected to the vehicle's ACC power supply through a series resistor R20, diode D12 and resistor R21; the current output terminal of the transistor Q4 is grounded. The AC pin of the main control chip (U3) is electrically connected to the current input terminal of transistor Q6; the AC pin of the main control chip (U3) is electrically connected to the VDD power supply through resistor R13; the control terminal of transistor Q6 is adapted to receive a trigger signal through a series connection of resistor R14, diode D10, resistor R15 and the low-voltage control interface (Z2); the current output terminal of transistor Q6 is grounded. The ET pin of the main control chip (U3) is electrically connected to the low-voltage control interface (Z2) and is adapted to issue an enable control signal through the low-voltage control interface (Z2).

7. An insulation control device for an accessory of a new energy vehicle according to any one of claims 1 to 6, characterized in that, The insulation control device further includes a housing (Z1) and a PCB control board (Z3) attached to the housing (Z1); the power management chip (U1), the communication chip (U2), the main control chip (U3), the positive current detection module, the negative current detection module, the positive relay and the negative relay are attached to the PCB control board (Z3). The low-voltage control interface (Z2), the high-voltage input interface (Z9), and the high-voltage output interface are connected to the housing (Z1) or connected to the housing (Z1) via a connecting line (Z7).

8. An insulation control device for an accessory of a new energy vehicle according to claim 7, characterized in that, The insulation control device further includes a mounting bracket (Z10) adapted to engage the housing (Z1) to the vehicle, a detachable end cap (Z5) engaged with the housing (Z1), a fastening bolt (Z6) adapted to fix the end cap (Z5) to the housing (Z1), a sealing ring (Z4) engaged between the housing (Z1) and the end cap (Z5), a vent valve (Z8) engaged with the end cap (Z5), and a connecting wire (Z7) extending outward from the end cap (Z5) for connecting the high-voltage input interface (Z9) or the high-voltage output interface. The housing (Z1) is provided with a slot for the PCB control board (Z3) to slide. The power management chip (U1) is model XL1509; The communication chip (U2) is model TJA1044; The main control chip (U3) is model R5F10BB.

9. A circuit system for a new energy vehicle, characterized in that, An insulation control device comprising a power distribution component and an accessory of a new energy vehicle as described in any one of claims 1 to 8; wherein the power distribution component is adapted to distribute electrical energy provided by the vehicle's power battery to the insulation control device and the vehicle's motor controller; the insulation control device is adapted to be electrically connected to the vehicle's electrical accessories.

10. A new energy vehicle, characterized in that, The invention comprises a circuit system for a new energy vehicle as described in claim 9, or an insulation control device for an accessory of a new energy vehicle as described in any one of claims 1 to 8.

Images