Signify Holding B.v.

Philips Lighting Holding B.v.

Derek Zheng

Haimin Tao

Xianhui Zhang

Zhi Quan Chen

Adrianus Johannes Stephanus Maria De Vaan

Gang Wang

Pieter Johannes Stobbelaar

Huojun Long

Brian Zhang

Wen Ran

Paul Robert Veldman

Liang Shi

The invention provides a retrofit LED lamp driver having a shunt switch to alternately shunt (for a first duration) and not shunt (for a second duration) received AC power. The first duration is concurring with a first polarity of each AC cycle of the AC power, for a first period comprising at least one AC cycle, and the first duration is concurring in a second, opposite polarity of the AC power, for a second period comprising another at least one AC cycle not overlapping with the first duration. Alternating the first and second periods are provided. Any DC offset in the current drawn caused by the shunting operation is thereby cancelled over time.

LED driver and LED lighting system for use with a high frequency electronic ballast

There is proposed an interface circuit for connecting an electronic ballast to a lighting arrangement, in which control of a coupling configuration of the interface circuit is dependent upon a frequency of the electronic ballast. In particular, a coupling configuration of the interface circuit is controlled by a control arrangement based on the ballast frequency.

Electronic ballast interface circuit

A lighting driver is for receiving an alternating current power supply from a fluorescent lighting ballast and makes use of a closed loop control of a shunt device for selectively shunting the power supply for example to implement dimming control. The closed loop control is adapted based a detected current. This enables low frequency components of the ballast current to be removed or reduced so that a smaller output capacitor is needed.

Lighting driver, lighting system and control method

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Eindhoven, Netherlands

Derek Zheng