Patent ID: 9692316
Date: 2017-06-27
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A power converter, comprising: a power supply front end that produces a rectified voltage at a first node; a converter electrically connected to the first node, and electrically connected to a first power lead of a transistor and an anode of a diode at a second end; a load capacitor having a first end and a second end, the load capacitor being electrically connected to the first node at the first end of the load capacitor, and electrically connected to a cathode of the diode at the second end the load capacitor; a bleeder circuit coupled to the second end of a first inductor, the bleeder circuit including a bleeder resistor in series with a coupling capacitor; and control circuitry to control switching of the transistor wherein the control circuitry is configured to periodically close a controllable switch only when a conduction angle of the controllable TRIAC is below a threshold so as to divide power consumption between the transistor and the bleeder resistor, wherein the bleeder circuit further includes the controllable switch having an oven state and a closed state and controlled by the control circuitry, wherein when the controllable switch is in a closed state, a first end of the bleeder resistor is electrically coupled to ground, wherein a second end of the bleeder resistor is electrically coupled to the coupling capacitor via a first bleeder diode such that an anode of the first bleeder diode is electrically connected to the bleeder resistor, and a cathode of the first bleeder diode is electrically connected to the coupling capacitor, and wherein the bleeder circuit further includes a second bleeder diode such that an anode of the second bleeder diode is electrically connected to the capacitor and a cathode of the first bleeder diode, and a cathode of the second bleeder diode is electrically connected to ground.