CIRCUIT FOR OUTPUT BALANCE AND SHORT CIRCUIT PROTECTION IN DC DISTRIBUTION BI-DIRECTIONAL CONVERTER

摘要

Disclosed is a circuit for output balance and short circuit protection in a direct current distribution bi-directional converter, which comprises: a current control switch unit connected to output terminals of the converter, which output bipolar direct current voltages, to limit output currents; a voltage control switch unit connected to the output terminals of the converter to maintain the balance of the output voltages; and a capacitor unit connected to the voltage control switch unit in parallel to be connected to a load. The current control switch unit is basically short-circuited. When at least one of the bipolar output currents of the converter exceeds a preset threshold, the current control switch unit stabilizes the overcurrent by performing PWM control on the terminal which outputs the overcurrent. The voltage control switch unit is basically open. When a difference between the bipolar output voltages of the converter is greater than preset tolerance, the voltage control switch unit recovers voltage balance by performing PWM control on the terminal which outputs a higher voltage of the voltages of both the output terminals. The circuit of the present invention can maintain the voltage balance regardless of the state of the load.