Signify Holding B.v.

Han Lu

Haimin Tao

Yun Yu Wang

Frits Tobi De Jongh

Jason J Yang

Jessie Wang

Tian Ella

Xiujuan Wu

Jing Xu Zhou

Jing Yang

Xi Quan Shen

Xianhui Zhang

Dalibor Cvoric

Ye Liu

Raimundo De Heer Galisteo

Deyong Kong

Tian Xiang Wen

Pieter Johannes Stobbelaar

Jingxu Zhou

Zhaoting Li

Xiajuan Wu

Peng Chen

Jing Li

Feng Wang

DeYong Kong

Jerzy Janczak

James Nourse

Wei Xia

Ai Ling Xu

Feng Ju

Yun Wang

A lamp has a safety circuit connected to first and second electrical connection terminals. A test is used to detect if the first and second electrical connection terminals are both connected to external power without an interfering impedance such a human body, and only then enable operation of the lamp. A time for the test is different from a time when another lamp in the system applies a test.

Lamp having a safety circuit, and a safety circuit for use in such lamps

A circuit board arrangement assembled by at least a first and a second circuit boards, each circuit board comprising: a portion of a circuit; and a first and a second electrical terminals to be electrically connected to a respective first and a second electrical terminals of the other circuit board of the first and the second circuit boards, so as to couple the portions of the circuit of the first and the second circuit boards, wherein the first and second electrical terminals on the circuit board are coupled with each other via the portion of the circuit on the other circuit board of the first and the second circuit boards, at least one board further comprising: a voltage suppression element (TSS, TSS) in the board connected across the first and second electrical terminals of the board, said voltage suppression element (TSS, TSS) is adapted to become conductive when a voltage thereacross reaches a threshold; characterized in that the portion of the circuit comprising at least one LED, and said LED (LED) of the first circuit board (B) and said LED (LED) of the second circuit board (B) are forwarded in the same direction and to be series connected between a first interconnection (LED+) of the first electrical terminals of the first and the second circuit boards and a second interconnection (LED&#x2212;) of the second electrical terminal of the first and the second circuit boards. The voltage suppression element is able to prevent overvoltage/arcing due to a disconnection of the series connection of the LEDs of the first and second circuit boards, as well as a disconnection of a interconnection of first terminals, and a interconnection of the second terminals.

Circuit board arrangement to prevent overvoltage and arcing

A tubular solid state lighting device has a pin safety circuit electrically connected to connection pins of the one end. The pin safety circuit comprises two protection components, of different types. In one set of examples, there is an electrically controlled isolation switch and an electronic switch which functions as a high voltage isolation barrier. The switch provides full galvanic contact separation, whereas the isolation barrier provides current protection if the isolation switch is not functional. In another set of examples, there is a mechanically controlled isolation switch and an electrical or electronic isolation barrier. This provides two levels of protection, but requiring only a single manual operation by the installer of the lighting device. It avoids end-of-life protection circuitry being triggered during the installation of the lighting device.

Tubular device for fitting to a tubular light fitting

A tubular LED lamp designed for connection to a high frequency ballast. An electrically conductive screen is provided with an electrical connection between an internal node, such as an internal LED ground, and the screen. This provides a low impedance path5 for leakage currents which bypasses the LED string and thus prevents glow.

Conversion circuit between fluorescent ballast and LED

A retrofit lamp is for use with a fluorescence lighting ballast. The retrofit lamp comprises a filament emulation circuit. A detection circuit detects (at least) if a connected ballast is an instant start electronic ballast or an electromagnetic ballast by detecting a potentially existing heating voltage across the filament emulation circuit. In response, an LED arrangement may be connected in a series configuration (for an instant start electronic ballast) or in a parallel configuration (for an electromagnetic ballast). In this way, the output power is managed to ensure efficient operation. A different pin safety function may also be provided in the different configurations.

Retrofit LED lamp

Embodiments of the present disclosure relate to an emergency inverter and an emergency lighting system. The emergency inverter comprises a power detecting module and a dimming signal generating module. The power detecting module is configured to detect an output power of the emergency inverter in an emergency state. The dimming signal generating module is coupled to the power detection module and configured to generate a dimming signal based on the output power of the emergency inverter in the emergency state.

Emergency inverter and emergency lighting system

Embodiments of the present disclosure involve a detection circuit for a tube and a tube including the detection circuit. The detection circuit comprises: impedance connected between two ends of a tube; a voltage detector configured to detect voltage on the impedance; a voltage threshold circuit configured to provide a voltage threshold; a first control circuit configured to compare voltage across the two ends of the tube to the voltage threshold, and to control the voltage detector to detect only when the voltage across the two ends of the tube is smaller than the voltage threshold. By using the detection circuit of the present disclosure, it can detect whether a human body contacts the tube under protection state, to avoid of the risk of getting an electrical shock.

Detection circuit and LED tube including the same

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Eindhoven, Netherlands

Han Lu