Patent ID: 9560705
Date: 2017-01-31
CPC Classifications: H05B,Y02B

Claim:
1. A power circuit comprising: a power conversion module including a transformer, a primary winding of the transformer coupled to a power source; a magnetic amplifier coupled to a secondary winding of the transformer, wherein the magnetic amplifier comprises a saturable magnetic core and two or more windings around at least a portion of the core; a light emitting diode string coupled to an output of the magnetic amplifier by a rectifier circuit, wherein the light emitting diode string includes a plurality of light emitting diodes coupled in series; a reset current source coupled to the output of the magnetic amplifier; a current sink coupled to an output of the light emitting diode string; and a control circuit coupled to the reset current source, the light emitting diode string, and to the current sink; wherein the magnetic amplifier comprises a first winding configured to transmit power to the light emitting diode string and a second winding configured to receive a reset current from the reset current source.