Andrus, Sceales, Starke & Sawall
Power circuit for electronic controller
 A power supply circuit configuration for an electronic controller comprises a current transformer, a first rectification circuit, a voltage drop circuit, a second rectification circuit, a voltage regulator and filter circuit, a control unit and a power switch unit. The electronic controller is connected externally to a pair of power cords and to a load through a power switch unit. The load is connected in series to the primary winding of the current transformer. When the power switch unit is triggered by the controller and the load start operating, the current flowing in the load is equal to the current flow in the primary winding of the current transformer. Then, the DC current is supplied to the control unit from a first electric path consisting of the current transformer, the first rectification circuit and the voltage regulator and filter circuit. When the load is not operating, the control unit is supplied with DC current from a second electric path consisting of the voltage drop circuit, the second rectification circuit, the voltage regulator and filter circuit. 
G
G05F
inventional
Jing-horng
Chen