Power Converter including Bidirectional Bypass Switching Circuit

摘要

The present invention relates to a power conversion device, which enables a control unit to receive direct power to be converted to an alternating current from an inverter and to supply alternating current power to a load when external input power is in an abnormal state. The power conversion device is characterized in that a bypass switch (510) including a transistor between external input power and a load receives a signal of a bypass signal generation unit (520) connected to a control unit to immediately block the bypass switch (510), wherein transistor collectors of the bypass switch (510) are respectively connected to cathodes of two diodes (D1, D2), and emitters of the transistor are respectively connected to anodes of other two diodes (D3, D4) so that a current passing through the diode (D1) connected between an external input and the transistor collector can pass through the transistor to pass through the diode (D4) connected between the transistor and a load on an output side if a phase of the external input is positive (+), and so that a current passing through the diode (D2) connected between the load on an output side and the transistor can pass through the transistor to pass through the diode (D3) between the transistor and the external input if a phase of the external input is negative (-), thereby allowing alternating current power from an inverter to be supplied to the load without being reversed to the external power by immediately blocking the bypass switch when the external input is in an abnormal state.