| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a two-wire automatic switch with a human body detection sensor capable of ON-OFF control of luminaire at low cost with a very simple circuit constitution without selecting an illumination load to a specific apparatus. <P>SOLUTION: This automatic switch with the human body detection sensor of a two-wire wiring accessory connected in series to a load 12 relative to an alternating current source AC, for supplying a power to the load 12, detecting a hot radiation from a human body, and performing ON-OFF control of power supply to the load 12 is equipped with a sensor circuit 15 for detecting the hot radiation from the human body, power supply switch circuits (TRAC, DB, Q22, Q23) for performing the ON-OFF control of power supply from the alternating current source AC to the load 12 based on a detection output from the sensor circuit 15, and voltage generation means (ZD, C2) for generating a direct-current voltage for a regulator. The switch is also equipped with current supply means (Q21, R2, R3) for supplying a micro constant charging current to the voltage generation means when the load 12 is in the OFF state, and the regulator 14 for inputting a voltage from the voltage generation means (ZD, C2), generating the stabilized direct-current voltage having a small loss, and supplying it to the sensor circuit 15. <P>COPYRIGHT: (C)2004,JPO</p> |
