Patent ID: 9648676
Date: 2017-05-09
CPC Classifications: H02M,H05B

Claim:
1. A bleeder circuit emulator for use in a power converter, the bleeder circuit emulator comprising: an input voltage modifier to be coupled to receive an input voltage signal that is representative of a magnitude of an input voltage of the power converter and to selectively provide a modified input voltage signal to an input of a controller in response to receiving a control signal, wherein the modified input voltage signal is representative of a value that is less than the magnitude of the input voltage; and a leading edge dimming detection circuit coupled to generate the control signal to engage the input voltage modifier to generate the modified input voltage signal in response to detecting leading edge dimming at an input of the power converter, wherein the leading edge dimming detection circuit further comprises: a first capacitance coupled to the input of the power converter; a first resistance coupled to a reference of the power converter; and a second resistance coupled between the first capacitance and the first resistance, wherein the control signal is a voltage across the first resistance that develops in response to leading edge dimming at the input of the power converter.