BRAKE CHOPPER DEVICE OF A KTX HIGH-SPEED RAILWAY PROPULSION CONTROL SYSTEM CAPABLE OF CONTROLLING TEMPERATURE RISE OF A PROPULSION CONTROL DEVICE

摘要

PURPOSE: A brake chopper device of a KTX high-speed railway propulsion control system is provided to simplify configuration of a main circuit by using two high power IGBT(Insulated Gate Bipolar Transistor)s.;CONSTITUTION: An IGBT(100) is parallely connected with a load resistance(110). A snubber circuit(200) is parallely connected with the IGBT. The snubber circuit restricts overvoltage. The snubber circuit is composed of a snubber capacitor(210), a snubber diode(220), and a snubber resistance(230). The snubber diode and the snubber resistance are parallely connected with the snubber capacitor. A reflux diode interlinks an emitter and a collector of the IGBT. The snubber circuit is parallely connected with the reflux diode. The snubber circuit is cooled by a heat pipe type forced air cooling method.;COPYRIGHT KIPO 2012