Alternating current solid-state relay

An alternating current solid-state relay, comprising an output switch circuit connected to a load loop in series, wherein the output switch circuit comprises two power switch transistors, a driver circuit having a short-circuit protection function, and a short-circuit detection circuit;

• the two power switch transistors are IGBTs or MOS transistors and are in opposing series, and two terminals formed after series connection of the two power switch transistors serve as two output terminals of the alternating current solid-state relay;
• a power circuit supplies power to the driver circuit, and the driver circuit correspondingly controls on-off of the two power switch transistors according to a control signal accessed to an input terminal of the driver circuit, and detects through the short-circuit detection circuit whether or not a short circuit happens to a load;
• and if yes, the two power switch transistors are controlled to be turned off;
• wherein the alternating current solid-state relay further comprises a photocoupler isolation circuit, the control signal is accessed to an input terminal of the photocoupler isolation circuit, a first output terminal of the photocoupler isolation circuit is connected to an enable signal output terminal of the timing circuit, and a second output terminal of the photocoupler isolation circuit is connected to the input terminal of the driver circuit.