Patent ID: 9480112
Filing Date: 2016-10-25
CPC Classification: H02M,H05B,Y02B

Claim Text:
1. A circuit, comprising: a detector to detect a firing start by a triode for alternating current (TRIAC) in a power supply based on a voltage output from a rectifier that rectifies an alternative current (AC) voltage from the power supply; and a controller to vary a pulse width modulation (PWM) signal to voltage-control a switch in connection with a magnetic component in response to the firing start to turn on the switch, and turn off the switch when a switch current flowing through the magnetic component rises to a first peak current limit in a duration, and turn on the switch, and turn off the switch when the switch current flowing through the magnetic component rises to a second peak current limit in order to shape a profile of a current pulled from the power supply to satisfy a latch current requirement and a hold current requirement of the TRIAC.