Separately excited inverter circuit and liquid crystal display television

摘要

The present invention discloses a separately excited inverter circuit whose switching circuit having a plurality of switching elements and which is capable of minimizing the damage of other switching elements even if any of the plurality of switching elements is short circuited and damaged. The separately excited inverter circuit includes: a switching circuit of which a full bridge circuit applies an AC voltage to the primary winding of the step-up transformer 26e; a control circuit C1 for performing the switching control of a switching circuit 26b when receiving a command signal for commanding the control circuit to oscillate from a transmission line for transmitting the command signal for commanding it to start and stop oscillation; terminal voltage monitoring circuits 51 and 52 for monitoring a terminal voltage across a gate of MOS-FET forming the switching circuit 26b and outputting a reference voltage when the gate voltage exceeds a predetermined threshold; and a thyristor circuit 53 which is connected to the transmission line and to the gate of which the reference voltage is inputted to cause the thyristor circuit to flow a gate current to be turned on, bringing the command signal on the transmission line into cutting off oscillation to stop the oscillation of the control circuit.