Patent ID: 8674627
Filing Date: 2014-03-18
Classification: H05B

Abstract:
1. An isolated flyback converter for an LED driver comprising: a snubber circuit unit connected to the primary side of a transformer and configured to substantially prevent at least one of overvoltage and overcurrent; a snubber voltage detection unit configured to at least one of detects a snubber voltage of the snubber circuit unit and generates a reference voltage proportional to the detected snubber voltage; a switching unit with a source terminal connected to at least one of a switching current sensing resistor and a drain terminal connected to the snubber circuit unit, wherein the switching unit is turned on or off in response to an arbitrary logic signal; and a control unit configured to compares voltage supplied through the switching current sensing resistor with the reference voltage supplied through the snubber voltage detection unit, wherein the control unit is configured to supply a logic signal at a relatively high level or a relatively low level in accordance with the comparison result to the switching unit to control the switching unit such that a secondary-side current of the transformer is maintained relatively constant.