A lighting fixture for a Light Emitting Diode, LED, lighting device, said fixture comprising an LED driver arranged to receive an Alternating Current, AC, mains voltage as input and provide an LED current to drive said LED lighting device; at least one socket comprising receiving means, arranged to receive and hold an LED lamp arranged to emit light, said socket further comprising a biased Double Pole Double Throw, DPDT, switch, comprising one set of input terminals and two sets of output terminals, wherein the output of said LED driver is connected to said input terminals of said biased DPDT switch, wherein a first of said two output terminals of said biased DPDT switch are short circuited, and wherein said biased DPDT switch is arranged to toggle between a short circuit position wherein said input terminals of said biased DPDT switch are connected to said first set of output terminals, and a connected position wherein said input terminals of said biased DPDT switch are connected to a second of said two output terminals, thereby connecting said LED driver to said LED lighting device; wherein said biased DPDT switch is further arranged to toggle from said short circuit position to said connected position upon insertion of said LED lighting device into said receiving means of said socket. A corresponding method of toggling a switch is also presented herein.

A light source driving device may include a DC-DC conversion unit for generating an output voltage by adjusting a level of an input voltage, and a first light-emitting unit and a second light-emitting unit, which are driven by the output voltage of the DC-DC conversion unit. A regulator may be connected to the output end of the second light-emitting unit, and a controller may have a feedback terminal connected to the output ends of the first light-emitting unit and the second light-emitting unit. The regulator may operate such that a preset target current is supplied to the second light-emitting unit. The controller may adjust a duty of the pulse control signal based on the entire preset target current of the first light-emitting unit and the second light-emitting unit and the feedback current inputted through the feedback terminal.

A self-repairing lighting system is provided, including: a power line; a ground line; a first lighting circuit arranged between the power line and the ground line, the first lighting circuit including a plurality of first lights arranged in series; and a first switch arranged in series with the plurality of first lights; a second lighting circuit arranged between the powerline and the ground, the second lighting circuit including a plurality of second lights arranged in series; and a second switch arranged in series with the plurality of second lights; a detector configured to detect an operating parameter of the self-repairing lighting system; a controller configured to operate the first and second switches based on the operating parameter. The operating parameter is one of a voltage drop on or a current passing through the power line, the ground line, or one of the lighting circuits.

A minimum voltage detector circuit is disclosed. The circuit includes a plurality of LED strings each having a plurality of series-coupled LEDs. The minimum voltage detector circuit is configured to detect a minimum voltage from among the plurality of LED strings, and also to perform open/short detection among the plurality of LED strings. The minimum voltage detector circuit includes a plurality of voltage comparators and correspondingly coupled replica circuits. Each of the voltage comparators includes an amplifier having a first input coupled to a cathode of a last LED of one of the plurality of LED strings, an output, and a second input coupled to the output. Each voltage comparator further includes a replica circuit coupled to the amplifier. The replica circuit is configured to maintain an output transistor of the amplifier in an active state when the amplifier is in an unbalanced state.

A drive device according to the present disclosure includes a drive circuit (10) and a detection circuit (20). The drive circuit (10) drives a plurality of channels on an individual basis. The plurality of channels includes a plurality of light emitting elements (5). The detection circuit (20) collectively detects abnormalities of all the channels. Further, the drive device (10) is electrically and mechanically connected, with a plurality of microbumps (4), to a light emitting element array that includes the plurality of light emitting elements (5).

An elongate tubular lighting assembly having a body with a length between spaced first and second ends. The tubular lighting assembly has a source of illumination and first and second connectors respectively at the first and second body ends. The first connector has cooperating first and second parts having first and second surfaces. The first and second connector parts are configured so that the first and second surfaces are placed in confronting relationship to prevent separation of the first and second connector parts with the body in an operative state as an incident of the first connector part moving relative to the second connector part from a position fully separated from the second connector part in a substantially straight path that is transverse to the length of the body into an engaged position.

An illumination circuit includes a first voltage source, plural first light-emitting diodes, plural first resistive elements, a first impedance element, a second voltage source, plural second light-emitting diodes, plural second resistive elements and a second impedance element. The plural first light-emitting diodes are connected with each other in parallel. A first terminal of each first resistive element is connected with a first output terminal of the corresponding first light-emitting diode. A second terminal of each first resistive element is connected with a first negative electrode of the first voltage source. A first terminal of the first impedance element is connected with a first positive electrode of the first voltage source. A second terminal of the first impedance element is connected with a first input terminal of each first light-emitting diodes. The plural second light-emitting diodes are connected with each other in parallel.

An illumination circuit includes a first voltage source, plural first light-emitting diodes, plural first resistive elements, a first impedance element, a second voltage source, plural second light-emitting diodes, plural second resistive elements and a second impedance element. The plural first light-emitting diodes are connected with each other in parallel. A first terminal of each first resistive element is connected with a first output terminal of the corresponding first light-emitting diode. A second terminal of each first resistive element is connected with a first negative electrode of the first voltage source. A first terminal of the first impedance element is connected with a first positive electrode of the first voltage source. A second terminal of the first impedance element is connected with a first input terminal of each first light-emitting diodes. The plural second light-emitting diodes are connected with each other in parallel.

An LED arrangement having a LED string and a smoothing capacitor connected in parallel. A controllable voltage limiter is able to limit a voltage across the LED string to selectively prevent the LED string from outputting light. As the LED arrangement is turned ON, the controllable voltage limiter may activate so that the smoothing capacitor can be charged with a high current without activating the LED string.

An LED arrangement having a LED string and a smoothing capacitor connected in parallel. A controllable voltage limiter is able to limit a voltage across the LED string to selectively prevent the LED string from outputting light. As the LED arrangement is turned ON, the controllable voltage limiter may activate so that the smoothing capacitor can be charged with a high current without activating the LED string.