| 摘要 |
A photoswitch includes first and second signal sources for outputting first and second input signals that switch between high and low logic states according to intensity of ambient light, and a latch circuit having set and reset nodes coupled electrically and respectively to the first and second signal sources, and an output node coupled electrically to a switch circuit. When the first and second input signals respectively have the high and low logic states, the output node drives the switch circuit to an on state. When the first and second input signals respectively have the low and high logic states, the output node drives the switch circuit to an off state. When the first and second input signals both have the low logic state, the output node maintains the switch circuit at a current one of the on and off states.
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