| 摘要 |
PROBLEM TO BE SOLVED: To provide an AC voltage regulator capable of protecting a circuit from overcurrent, when a short circuit occurs in a load cable or loading equipment with a large rush current. SOLUTION: A protective device 10 of this AC voltage regulator 1 detects an overcurrent, which runs through a primary winding 5a of a transformer 5 with a current transformer CT, and converts the current outputted by the current transformer CT into a voltage with a resistor R1, a two-way switching device SBS is turned on when the voltage across the resistor R1 reach switching voltage of the two-way switching device SBS, which permits the output current of the current transformer CT to run through the gate circuit of a triac TR and turn on the triac TR, which permits both ends of the primary winding 5a to be short-circuited and a photocoupler PC, connected in series with the two-way switching device SBS to be turned on, a signal is outputted to a controller 8 of an AC chopper 6 from the photocupler PC, and a plurality of switching devices 7 comprising the AC chopper 6 is turned off by the controller 8.
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