Abstract:
An LED power circuit (1) for converting AC power into DC power to drive at least one LED to output light. The LED power circuit (1) includes an input unit (12), a current suppression unit (14), a power adjustment unit (15), a rectifier module (16) and an output unit (20). The input unit (12) receives the AC power. The current suppression unit (14) is coupled to the input unit (12). The current suppression unit (14) suppresses a current pulse and correspondingly outputs the AC power. The power adjustment unit (15) is coupled to the current suppression unit (14) to control and adjust the current and/or the power of the AC power. The rectifier module (16) is coupled to the power adjustment unit (15) to convert the AC power into DC power. The output unit (20) is coupled to the rectifier module (16) and at least one LED. The output unit (20) outputs the DC power to the at least one LED.
Abstract:
This invention discloses an LED illumination device and validation methodology of LED illumination device's lifespan, wherein a controller, timing chip and low-voltage DC power supply are installed inside the LED lamp, and the controller is connected directly or indirectly to the display terminal. In this invention, the timing chip is positioned inside the LED illumination device, so as to get real-time recording of the operating time of the LED illumination device which is transmitted to the display terminal for display; meanwhile, a light sensor is placed in the luminous zone to obtain luminosity data so as to measure real-time luminous maintenance rate. When the measured luminous maintenance rate gets lower than the luminous maintenance rate predetermined for critical lifespan, the operating time recorded by the LED illumination device at this moment is the lifespan of this LED illumination device.
Abstract:
Die Erfindung betrifft Schutzvorrichtungen zum Schutz von LED-Leuchtmitteln gegen Störimpulse. Die Schutzvorrichtung kann in ein Betriebsgerät (10), ein LED-Leuchtmodul (22) oder als separates Modul (30) ausgeführt sein und zeichnet sich aus durch eine mit den beiden LED-Anschlüsse verbundene Schutzschaltung (11) mit einer ersten Schutzkomponente (12), welche vorzugsweise spannungsbegrenzend wirkt, und mit einer zweiten Schutzkomponente (14; 13; 13A), welche die erste Schutzkomponente mit einem LED-Anschluss verbindet, wobei die erste Schutzkomponente (12), vorzugsweise unmittelbar oder über eine weitere Schutzkomponente (13B), mit dem anderen LED-Anschluss verbunden ist. Über einen Schutzanschluss bzw. Schutzleiter (16) ist zumindest die erste Schutzkomponente (12) mit einem Teil (18) in oder an einem Träger (17) des LED-Leuchtmittels, insbesondere ein Metallkern oder Kühlkörper, mit der Schutzschaltung (11) verbindbar ist, um störimpulsbedingte Überspannungen am LED-Leuchtmittel (2) zu begrenzen.
Abstract:
According to one embodiment, an LED lighting circuit includes a lighting circuit provided between an external power supply and LED elements and a control circuit that controls the lighting circuit. The lighting circuit includes an electrolytic capacitor, the capacitance of which decreases to be lower than a rated value or the impedance of which increases to be higher than a rated value at temperature equal to or lower than -20°C. The control circuit performs an initial lighting operation under a temperature environment equal to or lower than -20°C.
Abstract:
A light emitting apparatus 2 receives an external power. A switching unit 22 is electrically connected with an LED light emitting unit 21 to form a serial circuit. A first electrical connection element 23 is electrically connected with the external power and the light emitting unit 21. A second electrical connection element 24 is electrically connected with the external power and the switching unit 33. A sensing unit 25 is electrically connected with the first electrical connection element 23, the second electrical connection element 24 and the switching unit 22. When filament currents flow between two electrical input terminals of the first electrical connection element and between two electrical input terminals of the second electrical connection element, the sensing unit controls the switching unit to turn on to enable the light emitting unit to receive the external power and start to emit light. Thus, users can avoid the risk of electric shock when installing the light emitting apparatus.
Abstract:
The invention avoids damage to a double bridge circuit caused by the current feedback in case of a common ground (GND). The driving circuit of the bridges comprises a first bridge circuit (22), a second bridge circuit (23), a first protection device (24a) and a second protection device (24a). The first bridge circuit, comprising a first positive and a first negative input terminal and a first positive output terminal (OUT1+) and a first negative output terminal (OUT1-) to output a first voltage, is coupled to an AC voltage source (21). The second bridge circuit (23), comprising a second positive and a second negative input terminal, and a second positive output terminal (OUT2+) and a second negative output terminal (OUT2-), is coupled to the AC voltage source (21) to output a second voltage. The first and the second negative output terminals (OUT1-, OUT2-) are both coupled to the ground potential (GND).
Abstract:
According to one embodiment, an LED lighting circuit includes a lighting circuit provided between an external power supply and LED elements and a control circuit that controls the lighting circuit. The lighting circuit includes an electrolytic capacitor, the capacitance of which decreases to be lower than a rated value or the impedance of which increases to be higher than a rated value at temperature equal to or lower than -20°C. The control circuit performs an initial lighting operation under a temperature environment equal to or lower than -20°C.
Abstract:
Die Erfindung betrifft einen Signalgeber, der eine LED-Lichtquelle (2, 12) bestimmter Farbe ansteuert und mit einem Stellwerk zusammenwirkt. Ein signaltechnisch sicherer Signalgeber, der auf einfache Weise als signaltechnisch sicherer Mehrbegriffssignalgeber konzipierbar ist, zeichnet sich erfindungsgemäß dadurch aus, dass ein LED-Treiber (6) vorgesehen ist, welcher eingangsseitig über eine EMV-Schutzeinrichtung (3) mit dem Stellwerk und ausgangsseitig mit der LED-Lichtquelle (2, 12) verbunden ist und dass eine von der LED-Lichtquelle (2, 12) oder deren Bestromung beaufschlagte Messwerterfassung (7, 7.1) zur Ermittlung einer Ist-Betriebsart, insbesondere bezüglich Tag- oder Nachtbetrieb, mit einem Vergleicher (9) zum Vergleich der Ist-Betriebsart mit einer von dem Stellwerk vorgegebenen Soll-Betriebsart verbunden ist, wobei das Vergleichsergebnis einem in den Strompfad des LED-Treibers (6) eingeschleiften Abschalter (4) zugeführt ist.
Abstract:
A light emitting apparatus (2) receives an external power and includes a light-emitting unit (21), two rectifiers (22,23), a first electrical connection element (24) and a second electrical connection element (25). Each of the rectifiers has a first input terminal (221,231), a second input terminal (222,232), an output terminal (223,233) and a ground terminal (224,234). The output terminals are electrically connected together and are electrically connected with the light-emitting unit. The first electrical connection element is electrically connected with the external power and the first input terminals. The second electrical connection element is electrically connected with the external power and the second input terminals. The light emitting apparatus can replace the traditional fluorescent tube without changing the circuit of the lighting.