Patent ID: 9166496
Filing Date: 2015-10-20
Classification: H02M,H05B,Y02B

Abstract:
1. A two-wire load control device connected in series between a commercial power source and a load, comprising: a control unit configured to control ON and OFF of the load in response to a signal from an outside; a first power supply unit configured to reliably supply a power to the control unit; a second power supply unit configured to acquire an internal power when the load is turned off, wherein the second power supply unit includes a plurality of capacitors, a series/parallel switching circuit configured to switch between series and parallel connections of the plurality of capacitors, a switch connected to an output terminal for the first power supply unit and a switch controller configured to control ON (a closed state) and OFF (an open state) of the switch; wherein when a voltage inputted to the second power supply unit is higher than a predetermined voltage, the series/parallel switching circuit allows the plurality of capacitors to be connected in series and charge the plurality of capacitors, and the switch controller turns the switch off (an open state); and wherein when the voltage inputted to the second power supply unit is equal to or lower than the predetermined voltage, the series/parallel switching circuit allows the plurality of capacitors to be connected in parallel and discharge the plurality of capacitors, and the switch controller turns the switch on (a closed state), so that charging and discharging of the plurality of capacitors are repeated and a power obtained by discharging of the plurality of capacitors is used as the internal power.