Patent ID: 7106603

Claim:
A switch-mode self-coupling auxiliary power device in a power supplier for charging a maintaining capacitor, providing a power to a controller, comprising: a transformer having a main winding and a sub-winding for dividing said power supplier into a primary side circuit and a secondary side circuit, an first auxiliary winding connected to said maintaining capacitor, and a high voltage second auxiliary winding; a control circuit, wherein the control circuit obtains a load signal for outputting a control signal; and an energy transmitting circuit connected to said control circuit, said maintaining capacitor and said high voltage auxiliary second winding, controlled by said control signal to switch a voltage on said high second voltage auxiliary winding for charging said maintaining capacitor; wherein when said load signal represents a high or normal load condition, a voltage on said first auxiliary winding charges the maintaining capacitor, and when said load signal represents a low load condition, the voltage on said high voltage second auxiliary winding charges said maintaining capacitor.