Discharge protector used on electric vehicle

Abstract

The utility model relates to a discharge protector used on an electric vehicle, the discharge protector is arranged between a high-power DC (Direct Current) and a vehicle-mounted low-voltage driver, the other end of the high-power DC is connected to a vehicle-mounted high-voltage battery pack, the discharge protector consists of a shell and a mainboard chip arranged in the shell, the shell is provided with a fixing through hole, and the mainboard chip is connected with the high-power DC. A connecting through hole is formed in the side face of the shell, a mainboard chip is installed on the fixing through hole, the mainboard chip is installed in the shell, the connecting through hole is formed in the lower portion, the through hole is used for containing external interfaces arranged on the mainboard chip, and the external interfaces comprise an input and output interface, a serial port communication interface, an external load interface and a bus power interface. The device has the advantages of being simple and reasonable in structure, low in cost, safe, efficient, stable in operation and the like.

Description

Technical Field

[0001] This utility model belongs to the technical field of low-speed electric vehicles powered by high-power DC power supply, and relates to a discharge protection device used on electric vehicles. Background Technology

[0002] With the popularization of new energy vehicles, car charging faces many pressing problems. For example, there are insufficient charging facilities in parking lots, or vehicles running out of power and urgently needing recharging. This has led to the development of mobile power supply vehicles. These vehicles typically place large-capacity battery packs on a mobile platform vehicle. However, the vehicle's drive system often uses a low-voltage platform with its own drive unit and motor, which cannot be directly powered by a high-voltage battery system. Providing a separate low-voltage DC battery for the vehicle's drive unit not only increases vehicle costs but also makes the system complex and redundant. A high-power DC / DC converter is usually used to convert the voltage to the required level. However, when the vehicle decelerates or goes downhill, the energy generated by the motor cannot be released, causing the DC / DC output voltage to rise, leading to an overvoltage alarm in the low-voltage drive and rendering the vehicle unusable.

[0003] Therefore, a discharge protection device for use in electric vehicles is designed to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a discharge protection device for electric vehicles that is simple and reasonable in structure, low in cost, safe and efficient, and stable in operation.

[0005] This utility model is achieved through the following technical solution: a discharge protector used on an electric vehicle, wherein the discharge protector is disposed between a high-power DC and an on-board low-voltage driver, and the other end of the high-power DC is connected to the on-board high-voltage battery pack. The discharge protector consists of a housing and a mainboard chip disposed inside the housing. The housing has a fixing through hole and a connection through hole on the side of the housing. The mainboard chip is installed on the fixing through hole and the mainboard chip is installed inside the housing. The connection through hole is arranged below and is used to house the external interface provided on the mainboard chip. The external interface includes an input / output interface, a serial communication interface, an external load interface, and a bus power interface.

[0006] Preferably, the motherboard chip is equipped with a communication system, a power system, a discharge system, and a control system. The control system is a main control DSP module. The communication system consists of a serial communication module and a serial communication interface. The serial communication interface is connected to the main control DSP module through the serial communication module to set the voltage values ​​within the DSP module. The power system consists of an input / output interface circuit, an input / output interface, and an LDO power module. The input / output interface supplies power to the main control DSP module through the input / output interface circuit, and the LDO power module controls and detects whether the circuit is functioning correctly. The discharge system detects the voltage in the circuit, and if the voltage exceeds a preset value, the discharge system is activated to discharge the voltage.

[0007] Preferably, the discharge system consists of a voltage acquisition module, a relay module, a bus power supply module, a MOS drive module, a MOS discharge module, and an external load interface. All modules are powered by an LDO power supply module. The voltage acquisition module and the MOS drive module are both connected to the main control DSP module. The MOS drive module is connected to the MOS discharge module to discharge the discharged voltage through the external load interface. The relay module is connected to the voltage acquisition module, the bus power supply module, and the MOS discharge module respectively. When the voltage acquisition module detects a difference in voltage on both sides, the relay module is activated to transmit the bus voltage to the MOS discharge module for discharge until the voltage on both sides are close.

[0008] The beneficial effects of this utility model are as follows:

[0009] 1. This utility model eliminates the need for a separate power supply battery for the vehicle drive, thus reducing costs;

[0010] 2. This utility model releases excess energy in a timely manner through a discharge protector, avoiding frequent overvoltage alarms from the driver affecting its use;

[0011] 3. The discharge protector of this utility model can set the protection threshold through the serial communication interface and the debugging host computer, which is convenient and flexible, and the protection voltage can be reasonably adjusted according to different working conditions;

[0012] 4. The discharge protector of this utility model can also be set to the duration of a single discharge, so as to avoid the abnormal situation where the discharge resistor works continuously due to abnormal voltage, avoid the overheating of the protection resistor, and ensure safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the outer shell of this utility model.

[0015] Figure 3This is a system framework diagram of the present invention. Detailed Implementation

[0016] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1-2 As shown, a discharge protector used in an electric vehicle is disclosed. The discharge protector 1 is disposed between a high-power DC 2 and an on-board low-voltage driver 3. The other end of the high-power DC 2 is connected to an on-board high-voltage battery pack 4. The discharge protector 1 consists of a housing 5 and a mainboard chip 6 disposed inside the housing 5. The housing 5 has a fixing through hole 7 and a connection through hole 8 on its side. The mainboard chip 6 is installed on the fixing through hole 7 and is installed inside the housing 5. The connection through hole 8 is arranged below and is used to house the external interface provided on the mainboard chip. The external interface includes an input / output interface 9, a serial communication interface 10, an external load interface 11, and a bus power interface 12. The motherboard chip 6 is equipped with a communication system 13, a power supply system 14, a discharge system 15, and a control system 16. The control system 16 is the main control DSP module. The communication system 13 consists of a serial communication module 17 and a serial communication interface 10. The serial communication interface 10 is connected to the main control DSP module through the serial communication module 17 to set the voltage value in the DSP module. The power supply system 14 consists of an input / output interface circuit 19, an input / output interface 9, and an LDO power module 18. The input / output interface 9 supplies power to the main control DSP module through the input / output interface circuit 19, and the LDO power module 18 controls and detects whether the circuit is normal. The discharge system 15 detects the voltage in the line. If the voltage exceeds a preset value, the discharge system 15 is activated to discharge.

[0019] like Figure 3As shown, the discharge system 15 consists of a voltage acquisition module 22, a relay module 23, a bus power supply module 24, a MOS drive module 25, a MOS discharge module 21, and an external load interface 20. All modules are powered by an LDO power supply module 18. The voltage acquisition module 22 and the MOS drive module 25 are both connected to the main control DSP module. The MOS drive module 25 is connected to the MOS discharge module 21 to discharge the voltage through the external load interface 20. The relay module 23 is connected to the voltage acquisition module 22, the bus power supply module 24, and the MOS discharge module 21. When the voltage acquisition module 22 detects a difference in voltage on both sides, the relay module 23 is activated to transmit the bus voltage to the MOS discharge module 21 for discharge until the voltage on both sides is close.

[0020] The working principle of this utility model is as follows:

[0021] The positive and negative terminals of the external bus power supply are connected to the bleeder protector through the bus power interface 12. When the external KSI power supply is connected to the input / output interface circuit 19 through the input / output interface, the LDO power module 18 powers on, powering the main control DSP module, serial communication module 17, MOS driver module 25, and voltage sampling module, thus powering on the entire system. If the main control DSP module detects that the input / output interface circuit 19, serial communication module 17, LDO power module 18, MOS driver module 25, and voltage sampling module are functioning normally, it will control the main contacts of the relay module to close, connecting the bus power supply to the circuit. The bus voltage is detected by the voltage sampling module. The main control DSP compares the bus voltage sampled by the voltage sampling module with the preset voltage. If it is higher than the set opening voltage point, the main control DSP module controls the MOS driver module 25 to drive the MOS bleeder module 21 to open. After the MOS bleeder module 21 opens, the bus power supply connects to the external load power interface. Excess energy on the bus is released through the external bleeder resistor on the external load power interface. As energy is released, the voltage on the bus drops below the shutdown voltage set by the main control DSP module. At this point, the main control DSP module controls the MOS drive module 25 to drive the MOS discharge module 21 to shut down, thereby reducing the power consumption of the bus. Furthermore, the main control DSP module's program can be set to determine the duration for which the MOS discharge module 21 is open each time. If the preset time is exceeded, the MOS discharge module 21 will also shut down until the bus voltage drops to the preset shutdown voltage and then exceeds the preset opening voltage again before reopening.

[0022] This invention, through the above-described working principle, connects the discharge protector to the circuit system according to the connection method shown in the schematic diagram, thereby ensuring that the driver that drives the vehicle operates within the normal voltage range and ensuring the normal operation of the vehicle.

[0023] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A discharge protector used in an electric vehicle, wherein the discharge protector is disposed between a high-power DC power supply and an on-board low-voltage driver, and the other end of the high-power DC power supply is connected to an on-board high-voltage battery pack, characterized in that: The discharge protector consists of a housing and a motherboard chip housed inside the housing. The housing has a fixing through hole and a connection through hole on its side. The motherboard chip is installed in the fixing through hole and the motherboard chip is installed inside the housing. The connection through hole is located below and is used to house the external interfaces set on the motherboard chip. The external interfaces include input / output interfaces, serial communication interfaces, external load interfaces, and bus power interfaces.

2. A bleed protector for use on an electric vehicle according to claim 1 characterised in that: The motherboard chip is equipped with a communication system, a power system, a discharge system, and a control system. The control system is a main control DSP module. The communication system consists of a serial communication module and a serial communication interface. The serial communication interface connects to the main control DSP module through the serial communication module to set the voltage values ​​within the DSP module. The power system consists of an input / output interface circuit, an input / output interface, and an LDO power module. The input / output interface supplies power to the main control DSP module through the input / output interface circuit, and the LDO power module controls and detects whether the circuit is functioning properly. The discharge system detects the voltage in the circuit; if the voltage exceeds a preset value, the discharge system is activated to discharge the voltage.

3. A bleed protector for use on an electric vehicle according to claim 2, characterised in that: The discharge system consists of a voltage acquisition module, a relay module, a bus power supply module, a MOS driver module, a MOS discharge module, and an external load interface. All modules are powered by an LDO power supply module. The voltage acquisition module and the MOS driver module are both connected to the main control DSP module. The MOS driver module is connected to the MOS discharge module to discharge the discharged voltage through the external load interface. The relay module is connected to the voltage acquisition module, the bus power supply module, and the MOS discharge module respectively. When the voltage acquisition module detects a difference in voltage on both sides, the relay module is activated to transmit the bus voltage to the MOS discharge module for discharge until the voltage on both sides are close.

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