INTRINSIC SAFETY STRUCTURE TYPE POWER SUPPLY

摘要

An intrinsic safety structure type power supply is provided to prevent the heat generation of the Zener circuit part by adding the relay for the heat dissipation between the Zener circuit part and the bridge circuit. An intrinsic safety structure type power supply comprises a bridge circuit(20), the Zener circuit part(30) and a relay(500) for heat dissipation. The relay for the heat dissipation is arranged between the output terminal of the bridge circuit and the Zener circuit part for the overvoltage protection. The light emitting diode is connected to the relay for the heat dissipation. The light emitting diode informs the operation whether or not of the relay for the heat dissipation. The relay for the heat dissipation is connected to a remote control relay(50). The remote control relay switches ON/OFF the output of the Zener circuit part in the remote site. The relay for the heat dissipation is connected in the ON/OFF drive of the remote control relay.