Patent ID: 8664922
Filing Date: 2014-03-04
Classification: H02M

Abstract:
1. An apparatus comprising: an AC switching circuit; a control circuit coupled to the AC switching circuit; and a biasing snubber circuit coupled to the switching circuit and the control circuit to capture energy from a circuit switched by the switching circuit and to provide at least a portion of the captured energy to bias the control circuit, wherein the biasing snubber circuit comprises; a first and second series resistor/capacitor pair correspondingly coupled to a first and a second drain of a first and a second Field Effect Transistor (FET) of the AC switching circuit; a first diode coupled between a first source of the first FET and the first series resistor/capacitor pair, an anode of the first diode coupled to the first source and a cathode of the first diode coupled to the first series resistor/capacitor pair; a second diode coupled between a second source of the second FET and the second resistor/capacitor pair, an anode of the second diode coupled to the second source and a cathode of the second diode coupled to the second series resistor/capacitor pair; a third diode, an anode of the third diode coupled to the cathode of the first diode; a fourth diode, an anode of the fourth diode coupled to the cathode of the second diode and a cathode of the fourth diode coupled to a cathode of the third diode; and a capacitor coupled between coupled cathodes of the third and fourth diodes and the first and second sources, the first and second sources coupled together.