Inventor

ZHANG WANFENG

US60 patents

⚠️ This page may combine multiple inventors who share the name “ZHANG WANFENG”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

ZHANG WANFENG

MARVELL WORLD TRADE LTD

Method and apparatus for controlling a lighting device

Intelligent switching controller and power conversion circuits and methods

Current shaping for dimmable LED

Multi-string dimmable LED driver

Isolated AC-DC converter with master controller on secondary side and slave controller on primary side

Method and apparatus for controlling a power adjustment to a lighting device

Method and apparatus for dimmable LED driver

Systems and methods for estimating an output current of a power conversion circuit

Current shaping for dimmable LED

Method and apparatus for dimmable LED driver

Current limiting circuit and method for LED driver

Method and apparatus for altering a color of a mixture of light provided by mixing outputs of light from multiple lamps

Temperature foldback circuit for LED load control by constant current source

Integrated circuit architecture for light emitting diode-based displays

Apparatuses for bleeding current from a transformer of a solid-state light emitting diode

LED controller with compensation for die-to-die variation and temperature drift

MARVELL INT LTD

Diode bridge

Current shaping scheme in TRIAC dimmable LED driver

Color mixing system with buck-boost and flyback topologies

Bleeder method using switch node coupling capacitor for TRIAC dimming of solid state lighting

Pfm-pwm control for power regulators

Overshoot prevention for deep dimming startup

Soft bleeder to remove step dimming

Resonant converter with synchronous rectifier feedback

Circuits and methods for determining peak current

Method and apparatus for dimming

Start-up voltage for solid-state lighting controller

Method and apparatus for controlling TRIAC dimmable device

Method and apparatus for selectively loading a dimmer circuit

Diode emulator circuit

Method and apparatus for controlling TRIAC dimmable device

ZHANG WANFENG

Method and apparatus for dimming

LED controller with compensation for die-to-die variation and temperature drift

Correlated color temperature control methods and devices

Dimming control for electronic lamp

Method and apparatus for LED lighting

Systems and methods for integrating LED displays and LED display controllers

SUTARDJA SEHAT

Regulator for LED lighting color mixing

TRIAC dimming systems for solid-state loads

Buck regulator for LED lighting color mixing and/or current compensation

CHOI JINHO

TRIAC dimmer detection

Circuits and methods for determining peak current

Average output current estimation using primary-side sensing

IWATT INC

Parallel current mode control using a direct duty cycle algorithm with low computational requirements to perform power factor correction

Parallel current mode control using a direct duty cycle algorithm with low computational requirements to perform power factor correction

HUAYUAN SEMICONDUCTOR SHENZHEN LTD COMPANY

Controlling an active clamp switching power converter circuit based on a sensed voltage drop on an auxiliary winding

Voltage sensing of an active clamp switching power converter circuit using auxiliary winding having an opposite polarity as a primary winding

KRISHNAMOORTHY RAVISHANKER

Multi-function feedback using an optocoupler

ZHANG HONG LIANG

Reducing voltage stress in a flyback converter design

PITIGOI-ARON RADU

Dimmer circuit for electronic loads