Patent ID: 9300287
Filing Date: 2016-03-29
CPC Classification: H03K

Claim Text:
1. A solid state relay comprising: a pair of input terminals; a light-emitting element between the pair of input terminals; a light-receiving element configured to carry out photoelectric conversion on light outputted from the light-emitting element and configured to output current; a pair of output terminals configured to connect to an AC power supply and a load, the pair of output terminals including a first output terminal and a second output terminal; a first connection line connecting a first end of the light-receiving element to the first output terminal; a second connection line connecting a second end of the light-receiving element to the second output terminal; a switching element between the first connection line and the second connection line and configured to be turned on by the current outputted from the light-receiving element; and a snubber circuit between the first connection line and the second connection line and including a capacitor and a resistor, the capacitor and the resistor connected in series, wherein the resistor is electrically coupled at a first end to the light-receiving element and at a second end to the switching element, an over-current protection element is coupled at a first end to the first connection line and at a second end to the second end of the resistor, and wherein the over-current protection element is configured to blow out when more current than needed flows into the snubber circuit or the light-receiving element in order to prevent the snubber circuit and the light-receiving element from being burnt.