| 摘要 |
The present invention is provided with a light emitting diode 11 connected on a microcomputer side, an IGBT gate control portion 20 provided with a light receiving element 21 and a push-pull circuit, and a two-way switch portion 30 for controlling an alternating current. The two-way switch portion 30 is composed of a first IGBT 31 and a second IGBT 32 whose emitters are connected to each other and whose gates are connected to the output of the push-pull circuit, and a first FRD 33 and a second FRD 34 whose anodes are connected to each other. The collector of the first IGBT 31 is connected to the cathode of the first FRD 33, and the collector of the second IGBT 32 is connected to the cathode of the second FRD 34. ON/OFF control of the alternating current on the output side is controlled by connecting a signal line between the connection point of the emitters of the first IGBT 31 and the second IGBT 32, and the connection point of the anodes of the first FRD 33 and the second FRD 34.
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