A supercapacitor module power management system for automobiles

Abstract

A super-capacitor module power source management system for an automobile, comprising a super-capacitor module (1), a lead-acid battery (2), an onboard power source system (3) connected to the lead-acid battery (2), a microcontroller (4), a super-capacitor temperature detection circuit (5), an analogue switch (6), an upper-bridge PWM drive circuit (7), a lower-bridge boost drive circuit (8), a start relay (9), a voltage detection circuit (10), a current detection circuit (11) and a data storage module (12), wherein the upper-bridge PWM drive circuit (7), the lower-bridge boost drive circuit (8) , the super-capacitor module (1) and the start relay (9) are connected in sequence. The system mainly effectively controls the charging / discharging process of the super-capacitor module, disconnects the charging when the temperature of a super-capacitor is too high, and can avoid the condition of earthing short circuit when an upper bridge and a lower bridge are switched on simultaneously. The system uses a microcontroller for control. It can be guaranteed through a program policy that a car can be normally started under the conditions of low temperature and battery under-voltage, and the large current discharging of the lead-acid battery is supplemented through the program policy to prevent an electrode of the lead-acid battery from being damaged.

Description

technical field [0001] The invention relates to a supercapacitor module power management system for automobiles. Background technique [0002] For the starting power supply on the car, the starter power of the general car is about 1.2KW to 2.2KW, the starting current reaches about 200A to 100A, and the car battery capacity is 40AH to 120AH, and the battery needs to maintain 3C to 5C discharge, which is easy Damage to the battery electrodes, especially when the battery is started at low voltage, there will be a 7 to 8C discharge. At this time, the battery electrodes will bear a huge current, resulting in electrode strain. Using super capacitor compensation can suppress the instantaneous current at startup. However, the charging and discharging internal resistance of supercapacitors is only milliohm or sub-milliohm level, which can cause a large current no matter charging or discharging. If the output current is large when starting, if there is no limit after starting, it wil...

AI Technical Summary

Problems solved by technology

However, the charging and discharging internal resistance of supercapacitors is only milliohm or sub-milliohm level, which can cause a large current regardless of charging or discharging.

Output a large current when starting, if there is no limit after starting, it will also cause a large charging load of the generator, exceeding its maximum power, endangering the brushes and coils of the generator

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