The present invention relates to an auxiliary power supply apparatus for a railway vehicle which allows an LLC resonant converter to operate at a resonance point at all times regardless of the level of an input voltage supplied from a wire. The auxiliary power supply apparatus for a railway vehicle has a first switch to a fourth switch (S1-S4) connected in series between a positive (+) terminal and a negative (-) terminal of input terminals, and a switch control unit to control operations of the first switch to the fourth switch (S1-S4) in accordance with a sensing result of a voltage detection sensor for detecting an input voltage supplied from a wire. The switch control unit turns off the first switch (S1) or the fourth switch (S4) for a prescribed period when a larger input voltage than a normal voltage is detected to make the voltage value of input terminals (a, b) of an LLC resonant converter become 0V to convert power.

    본 발명은 가선에서 공급되는 입력전압의 크기에 상관없이 LLC 공진형 컨버터가 항상 공진점에서 동작하도록 하는 철도차량용 보조전원장치에 관한 것이다. 이러한 철도차량용 보조전원장치는, 입력단의 +단자 및 -단자 사이에 제1 스위치 내지 제4 스위치(S1 ~ S4)가 직렬 연결되고, 가선에서 공급되는 입력전압을 감지하는 전압 감지센서의 센싱 결과에 따라 제1 스위치 내지 제4 스위치(S1 ~ S4)의 동작을 제어하는 스위치 제어부가 구비된다. 그리고 스위치 제어부는 정상전압보다 큰 입력전압이 감지되면 제1 스위치(S1) 또는 제4 스위치(S4)를 소정시간 동안 턴-오프 시켜 LLC 공진형 컨버터의 입력단(a-b) 전압 값이 0V가 되게 하여 전력 변환이 이루어지게 된다.


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    Title :

    Auxiliary Power Unit for Rail vehicle


    Additional title:

    철도차량용 보조전원장치


    Contributors:

    Publication date :

    2021-01-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B61C Lokomotiven , LOCOMOTIVES / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen



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