| 摘要 |
PROBLEM TO BE SOLVED: To provide a human sensor switch circuit capable of starting a high function control circuit stably.SOLUTION: A human sensor switch circuit includes a triac, a rectification bridge having an AC input connected with one main terminal and a gate terminal of the triac, a first power supply circuit having an input connected between the DC outputs of the rectification bridge, a control circuit connected with the output of the first power supply circuit and the output of a human sensor, and outputting a first control signal after start-up, a second power supply circuit for cascading the first power supply circuit, a first switch circuit and a second switch circuit connected between the rectification bridge and second power supply circuit, conducting between the DC outputs of the rectification bridge and between the rectification bridge and second power supply circuit when an AC power supply is turned on, and interrupting between the DC outputs of the rectification bridge and between the rectification bridge and second power supply circuit by a first control signal after the control circuit is started.SELECTED DRAWING: Figure 1 |
