SIGNAL TRANSMISSION CIRCUIT FOR SEMICONDUCTOR BIDIRECTIONAL SWITCH

摘要

PROBLEM TO BE SOLVED: To reduce the size and price of a signal transmission circuit including a gate driving circuit. SOLUTION: In order to transmit a signal based on the negative pole of a driving power supply Ed2 to the negative pole of a driving power supply Ed1 whose potential is positively/negatively changed relative to the power supply Ed2, a signal transmission line 1 is connected between the positive pole of the power supply Ed1 and the negative pole of the power supply Ed2 and a signal transmission circuit 2 is connected between the negative pole of the power supply Ed1 and the positive pole of the power supply Ed2, so that inexpensive optical and magnetic insulating parts which are required for a conventional signal transmission circuit can be made unnecessary.