Ledvance Gmbh

Osram Gmbh

Xusheng Yang

Arwed Storm

Xiongqiang He

Shaoping Chen

Andreas Mitze

Daxin Lin

ShiYu Ding

Peter Hummel

Kaichun Huang

Qingfu Zhang

Xia Song

Shiyu Ding

A driver for driving an LED light engine of an LED tube is provided. The driver includes (I) a first driver unit including an input stage for connecting to a power supply, an output stage for connecting to the LED light engine, and a power converter stage for converting input power from AC mains or a CCG (electromagnetic control gear) into an output power for driving the LED light engine and (II) a second driver unit including an input stage for connecting to a power supply, an output stage for connecting to the LED light engine, and a power converter stage for converting input power from an ECG (electronic control gear) into an output power for driving the LED light engine. The two driver units are alternatively activatable for driving the LED light engine depending on when the LED tube is connected to AC mains, a CCG, or an ECG.

Driver for driving an LED light engine of an LED tube

The present invention relates to a drive device for an illuminating load, an illumination device, a lighting system and a method for controlling the lighting system, wherein the drive device is connected between the illuminating load and a power adapter device for power supply, wherein the drive device comprises a control unit, wherein the control unit is configured to adjust the impedance of the drive device according to an electric output signal measured from the illuminating load so as to accordingly adjust the output voltage of the power adapter device and thereby to adjust the electric output signal for the illuminating load.

Drive device for illuminating device, illumination device, lighting system and method for controlling the lighting system

The LED driving circuit includes: a detecting circuit that detects whether an input current of the driving circuit is low or high frequency; a first stage converter that converts the input of the driving circuit to provide a DC power suitable for the LED; a first feedback loop that is activated by a low frequency current, to convert a current from a LED load to a feedback voltage and feed it back to the first stage converter, wherein in the first feedback loop, the feedback voltage changes as a function of the current of the LED load; and a second feedback loop that is activated by high frequency current, to convert the current from the LED load to the feedback voltage and feed it back to the first stage converter, wherein in the second feedback loop, the feedback voltage changes as a function of the current of the LED load.

Light emitting diode driving circuit and light emitting diode lighting device

A double-capped LED lamp operates on an electronic ballast for a low-pressure discharge lamp. The lamp has a first lamp cap having at least one first lamp connection, a second lamp cap having at least one second lamp connection, and an LED driver unit, which is electrically coupled between the first lamp connection and the second lamp connection, for activating a plurality of LEDs on the basis of a lamp voltage supplied by the electronic ballast between the first lamp connection and the second lamp connection in a first operating state. The lamp comprises a switching element for the galvanic separation of the first lamp connection from the LED driver unit in a second operating state, and an activation device for switching at least from the second operating state into the first operating state according to the lamp voltage.

LED double-capped lamp, for operation on an electronic ballast for a low-pressure discharge lamp, especially a fluorescent lamp, and method for operating such a lamp

A lamp driver for an LED lamp is provided, comprising a voltage input port for connecting the lamp driver to a power source, a relay that is switchable between an energized state and a de-energized state according to a pick-up voltage, and a relay controller circuit that connects the relay to the voltage input port and that is switchable between a conducting state and an non-conducting state according to a threshold voltage, wherein the pick-up voltage is smaller than the threshold voltage.

Lamp driver for an LED lamp and LED lamp for placement into a fluorescent lamp fixture

A load drive circuit may include a DC power source configured to provide a DC output voltage for at least one load based on an output voltage of an AC/DC converter, the DC output voltage having a ripple, a variable resistance module connected to the load, a ripple reduction module that generates, based on a reference voltage and a feedback signal from the load, a variable resistance adjusting signal for adjusting the resistance of the variable resistance module so as to reduce a ripple of the load current, wherein the reference voltage is generated based on the DC output voltage, and a reference voltage adjusting module that adjusts the average value of the reference voltage based on the variable resistance adjusting signal, so as to make the average value of the reference voltage approach the average value of the feedback signal as much as possible.

Growing community of inventors

Guangdong, China

Xusheng Yang