Patent ID: 8981595
Filing Date: 2015-03-17
Classification: H05B

Abstract:
1. A power supply system for an illumination source of a video capturing device: a switching power supply controller coupled to control a current through a primary inductor of a transformer to regulate a first output voltage on a first output that is coupled to a secondary inductor of the transformer to a first target value in response to a sense signal; a first output stage having a first storage element coupled to the first output to store the first output voltage, and having a first feedback network configured to form a first feedback signal that is representative of the first output voltage; a second output stage having an input configured to receive a voltage from the primary inductor of the transformer, a rectifier coupled to the input, a second output for forming a second output voltage, a second storage element coupled to receive a signal from the rectifier and store a voltage, and a second feedback network configured to form a second feedback signal that is representative of the second output voltage; and a feedback selector configured to selectively couple the first feedback signal to the sense signal for regulating the first output voltage to the first target value and not regulating the second output voltage to a second target value, and to selectively couple the second feedback signal to the sense signal for regulating the second output voltage to the second target value and not regulating the first output voltage to the first target value.