Patent ID: 9246378
Filing Date: 2016-01-26
CPC Classification: H02M,H05B

Claim Text:
1. A power conversion system with a delayed start time, comprising: a voltage detector for receiving a rectified voltage; and comparing a reference voltage and the rectified voltage to generate an output signal when the rectified voltage exceeds the reference voltage; a delay timer configured to: receive the output signal and generate a sink signal and an enable signal; a power converter enabled by the enable output signal; and a current sink circuit comprising a transistor for drawing a sink current from a source of the rectified voltage and an analog switch comprising a switch output coupled to the gate of the transistor and inputs configured to receive the sink signal, the enable signal and a voltage signal; wherein the analog switch connects the switch output to a constant current when the power converter is not enabled and connects the switch output to a variable voltage circuit when the power converter is enabled.