Inventor

CHANG CHIN

US45 patents

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

CHANG CHIN

KONINKL PHILIPS ELECTRONICS NV

Autonomous solid state lighting system

Sample and hold method to achieve square-wave PWM current source for light emitting diode arrays

Integrated LED driving device with current sharing for multiple LED strings

Adaptive control system and method with spatial uniform color metric for RGB LED based white light illumination

RGB LED based light driver using microprocessor controlled AC distributed power system

LED luminaire with electrically adjusted color balance using photodetector

RGB primary color point identification system and method

Control and drive circuit arrangement for illumination performance enhancement with LED light sources

White LED luminary light control system

Power feedback power factor correction scheme for multiple lamp operation

Method and system for driving a capacitively coupled fluorescent lamp

LED-based white-light backlighting for electronic displays

PWM LED regulator with sample and hold

Solar cell array having lattice or matrix structure and method of arranging solar cells and panels

Method of extended color sense and estimation for RGB LED illuminants

Switchable power converter with coupled inductor boost and coupled inductor SEPIC for multiple level input line power factor correction

Short circuit protection for multiple lamp LCD backlight ballasts with PWM dimming

Apparatus and method for detecting a short circuit in a lighting system

High frequency electronic ballast with reactive power compensation

Voltage-fed push LLC resonant LCD backlighting inverter circuit

Resonant converter circuit with suppression of transients during changes in operating condition

Transformation structures for approximating color matching functions

Seamless highlighting in LCD monitors and LCD-TV

PHILIPS ELECTRONICS NA

White light-emitting-diode lamp driver based on multiple output converter with output current mode control

High frequency electronic ballast for multiple lamp independent operation

Multiple lamp LCD backlight driver with coupled magnetic components

LED array employing a lattice relationship

Lattice structure based LED array for illumination

Matrix structure based LED array for illumination

Three-dimensional lattice structure based led array for illumination

High power electronic ballast with an integrated magnetic component

Voltage regulated power supply utilizing phase shift control

Switching scheme for power supply having a voltage-fed inverter

Voltage regulated electronic ballast for multiple discharge lamps

Electronic ballast with inductive power feedback

Self-oscillating resonant converter with passive filter regulator

Electronic ballasts with current and voltage feedback paths

Regulated self-oscillating resonant converter with current feedback

Reconfigurable converter for multiple-level input-line voltages

Transformer winding technique with reduced parasitic capacitance effects

Electronic ballast employing a startup transient voltage suppression circuit

SEMTECH CORP

Method and apparatus for improved current mode control for large conversion ratio synchronous buck converter with lossless current sense

Variable on-time control method for high light-load efficiency, small output voltage ripple, and audible-noise-free operation

PENG HAO

Digital control of PWM converters with nonlinear gain scheduling

PHILIPS CORP

Circuit arrangement