Invention Grant
- Patent Title: Control method and device for quasi-resonant high-power-factor flyback converter
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Application No.: US15722398Application Date: 2017-10-02
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Publication No.: US10181796B2Publication Date: 2019-01-15
- Inventor: Claudio Adragna , Giovanni Gritti
- Applicant: STMicroelectronics S.r.l.
- Applicant Address: IT Agrate Brianza
- Assignee: STMicroelectronics S.r.l.
- Current Assignee: STMicroelectronics S.r.l.
- Current Assignee Address: IT Agrate Brianza
- Agency: Seed IP Law Group LLP
- Main IPC: H02M3/335
- IPC: H02M3/335 ; H02M1/42 ; H02M1/08 ; H02M1/32 ; H02M1/36 ; H02M1/00

Abstract:
The present disclosure is directed to a high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a sinusoidal reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.
Public/Granted literature
- US20180048239A1 CONTROL METHOD AND DEVICE FOR QUASI-RESONANT HIGH-POWER-FACTOR FLYBACK CONVERTER Public/Granted day:2018-02-15
Information query
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