Flywheel energy storage pre-charge control circuit

Abstract

The utility model discloses a flywheel energy storage pre -charge control circuit is applied to flywheel energy storage system. The circuit contains voltage sampling module, voltage conversion module, comparison module, signal processing module, output logic interlock module and power module. Voltage sampling module passes through resistance voltage dividing network and divides the bus high voltage DC to the safe range, voltage conversion module utilizes photoelectric coupler isolated subcircuit and operational amplifier circuit, and the voltage after voltage division is converted into isolated single -end signal, comparison module compares this signal with the preset threshold value, and the output high low level, signal processing module converts pre -charge completion signal into low voltage logic signal, and output logic interlock module controls the opening and closing of pre -charge relay and main contactor according to the comparison result and pre -charge signal, can satisfy bus capacitor pre -charge control and protection logic simultaneously, can reduce the volume of pre -charge circuit again, can also save microcontroller peripheral resources, and satisfy the installation requirement of controller in the inside of PCS cabinet body.

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