Voltage-sharing device of super capacitors

Abstract

The invention discloses a voltage-sharing device of super capacitors and relates to an electric control system for a new energy automobile and a special vehicle, in particular to a balancing technology for super capacitors used in a power supply system for starting up the new energy automobile and the special vehicle. The voltages of the super capacitors are acquired at the input end of a sample conditioning unit and connected to a signal processing control unit after being amplified by a differential amplifier; the processing control unit outputs a control signal to control a voltage-sharing execution unit; and the voltage-sharing execution unit controls to share the voltages of the super capacitors. The voltage-sharing device is suitable for sharing the voltages of series-connection super capacitors with different voltage grades. The amount of the voltage-sharing circuits is selected according to the amount of the series-connection super capacitors; the voltage-sharing range is wide, and the voltage-sharing circuits can work after the voltages of the super capacitors exceed 1V; and the voltage-sharing device is high in reliability, long in voltage-sharing time and capable of properly reducing the voltage-sharing current, reducing the heat capacity and the temperature of each voltage-sharing circuit and improving the reliability.

Description

technical field [0001] The invention relates to the electric control system of new energy vehicles and special vehicles, especially the uniform technology of supercapacitors used in the start-up power supply system of such vehicles. Background technique [0002] With the outstanding requirements of environmental problems and the development of new technologies, new energy vehicles and special vehicles have emerged at the historic moment. The starting power supply system of these vehicles uses a large number of super capacitors to solve the instantaneous high power problem, thereby greatly improving the service life of the battery. Pressure equalization technology is an urgent problem to be solved at present. In the supercapacitor voltage equalization technology, the commonly used voltage equalization method is the limiter type voltage equalization circuit, which uses resistor divider to compare the supercapacitor voltage with the set protection point, and controls the discha...

AI Technical Summary

Problems solved by technology

Its disadvantages: First, the voltage equalization range is narrow, and the voltage equalization is only performed after the super capacitor reaches the equal voltage point. During most of the charging process, the voltage equalization circuit does not work; second, the voltage equalization effect is poor. In the process of high current charging, the voltage equalizing speed of the voltage equalizing circuit is too slow, which will cause the super capacitor to enter the overvoltage protection soon, which will limit the use of the super capacitor for high current charging and discharging.

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