Super capacitor module power management system for automobile

Abstract

The invention discloses a super capacitor module power management system for an automobile. The super capacitor module power management system comprises a super capacitor module, a lead-acid battery, an onboard power supply system connected with the lead-acid battery, a microcontroller, a super capacitor temperature detection circuit, an analog switch, an upper bridge PWM (Pulse Width Modulation) driving circuit, a lower bridge booster driving circuit, a starting relay, a voltage detection circuit, a current detection circuit and a data storage module, wherein the upper bridge driving circuit, a lower bridge driving circuit, the super capacitor module and the starting relay are connected in sequence. According to the super capacitor module power management system, the charging and discharging processes of the super capacitor module are mainly controlled effectively, charging is switched off when the temperature of a super capacitor is too high, and the situation of ground short circuit when an upper bridge and a lower bridge are switched on at the same time can be avoided. The microcontroller is used for controlling, normal start of a small automobile at under the conditions of low temperature and under-voltage of a battery can be ensured through a program strategy, and large-current discharging of the lead-acid battery is supplemented through the program strategy to prevent the electrode of the lead-acid battery from being damaged by pulling.

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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