Protection device and method for super capacitor of vehicle power supply system

Abstract

The invention discloses a protection device and method for a super capacitor of a vehicle power supply system. The protection device comprises a first voltage detector, a second voltage detector, a temperature detector, a processing unit, a control unit, a communication unit and a warning indicator, wherein the first voltage detector is used for detecting the voltage of a secondary battery; the second voltage detector is used for detecting the voltage of a super capacitor; the temperature detector is used for detecting the voltage of the super capacitor, the processing unit is a microprocessorand is used for controlling the charging and discharging of the super capacitor based on the detected voltage value and temperature value, the communication unit is a Bluetooth signal communicator and is used for transmitting and receiving Bluetooth signals, and the warning indicator is an LED warning lamp. The control unit is mainly formed by connecting a first transistor and a second transistorin series in a back-to-back mode, and the first transistor and the second transistor are metal oxide semiconductor field effect transistors respectively.

Description

technical field [0001] The present invention relates to a vehicle power supply system with a supercapacitor, and more particularly, to a protection device and a protection method for a supercapacitor of the vehicle power supply system, and the protection method is executed by the protection device. Background technique [0002] Based on the need to reduce fuel consumption and exhaust emissions, the car has developed an idle stop system start-stopsystem. The idle stop system is a system that controls the engine stop and start of the car. When the car is in an idle stop state, it automatically stops the engine. When the car is about to stop and start to move, the engine will automatically start running, and the engine will automatically turn off when the car is in the state of stopping, saving the fuel consumption of the engine when the car is in the state of idling, and also reducing the fuel consumption of the car in the state of stopping Exhaust emissions. [0003] When th...

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Problems solved by technology

[0008] However, the supercapacitor has a capacitive withstand voltage limit. If the voltage exceeds the capacitive withstand voltage value of the supercapacitor, it is easy to cause damage to the supercapacitor, and when the temperature of the supercapacitor is too high, it is easy to cause damage to the supercapacitor. Capacitor voltage and temperature constitute influence

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