ISOLATION-TYPE FAILED ALTERNATING CURRENT RESTRICTION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an isolation-type failed alternating current restriction circuit.;SOLUTION: In an isolation-type failed alternating current restriction circuit, a current adjustment circuit 1 comprises: a transformer 11; and a conductive circuit 12. The transformer 11 comprises: a primary-side winding unit 111 arranged in series between a power supply input system 2 and a load output system 3; and a secondary-side winding unit 112 that is a winding unit having an iron core like the primary-side winding unit 111 and mutually electrically isolated from the primary-side winding unit 111. The conductive circuit 12 is connected to the secondary-side winding unit 112 and composed of an electrical switch 121 and a power disconnection part 122 that are connected in series. In the case where a short-circuit occurs in a power supply system, when sensing that the short circuit of the primary-side winding unit 111 is of a large current, the power disconnection part 122 of the conductive circuit 12 melts and disconnects to stop the electric conduction. Then, the transformer 11 changes to an open circuit and provides an excited electrical resistance of a high resistance, and the equivalent inner resistance of the power supply input system 2 increases. Thus, a goal of restricting failed current is achieved, enabling a disconnection device 4 of the power supply system to smoothly isolate the short-circuit failure.;COPYRIGHT: (C)2012,JPO&INPIT