| 摘要 |
A time relay used for metal halide lamp and similar loads includes a control circuit, wherein the control circuit includes a buck regulator rectifier circuit A, an outage detection circuit B, a timing control circuit C, a tank circuit D and a relay output circuit E; the buck regulator rectifier circuit A is connected with the relay output circuit E, and the outage detection circuit B is connected with the buck regulator rectifier circuit A; the tank circuit D is connected with the buck regulator rectifier circuit A, and energy is stored when voltage is loaded at the direct current output end of the commutating and voltage-stabilizing circuit A; the timing control circuit C is connected with the relay output circuit E, at the instant that the direct current output end is converted from loading into unloading voltage, the tank circuit D supplies electricity to the timing control circuit C, the outage detection circuit B outputs a voltage unloading signal to the timing control circuit C, the timing control circuit C enters a long time delay timekeeping process, and the situation that an output contact K1 of the relay is prohibited to be closed until the timekeeping process is finished is controlled by the control circuit C through the relay output circuit E. The requirement for time delay of the metal halide lamp and similar loads is met and the metal halide lamp and similar loads can be effectively protected. |
