摘要:
In described examples, a slew rate controlled gate driver circuit (400) generates a gate control signal (V G ) that rises substantially in step fashion until reaching a first threshold voltage level (V TH1 ), whereupon the gate control signal (V G ) rises at a controlled slew rate. When the gate control signal (V G ) rises beyond a second threshold voltage level (V TH2 ) that is greater than the first threshold voltage level (V TH1 ), the gate control signal (V G ) again rises substantially in step fashion.
摘要:
The device for LED direct driver comprises a major LED string, a minor LED string set, a pre-regulator, and a direct driver. The major LED string has multiple series-connected LED diodes which has a first end and a second end. The minor LED string set has a first end and a second end, and is formed with multiple series-connected minor strings. The first end of the minor LED string set is connected to the second of the major LED string. Each minor LED string has at least one LED diode. The direct driver is connected to the pre-regulator, the major LED string, the minor LED string, which is configured to short out selected minor LED strings for ensuring the most efficient LED driving configuration. The pre-regulator provides an regulated voltage output. The regulated voltage output fed to the LED direct driver that is able to allow the LED direct driver to provide a constant power output with virtually no output power ripple.
摘要:
An LED fixture is described, the LED fixture comprising: -a plurality of LEDs, in use providing a light output; -a cover being provided with a plurality of different coatings of phosphor or phosphorous materials, each coating being arranged to substantially receive the light output of a subset of the plurality of LEDs; - a light sensor arranged below the cover and arranged to receive part of the light output of the plurality of LEDs.
摘要:
An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.
摘要:
A laser diode driving system includes a first high-side-drive current source for driving a first set of diodes, the first set of diodes including one or more laser diodes. A second high-side-drive current source drives a second set of diodes, the second set of diodes including one or more laser diodes. The system also includes an energy storage capacitor and an energy storage capacitor charger for charging the energy storage capacitor.
摘要:
A circuit and lighting unit for dimmable lighting applications are disclosed, the circuit comprising: a controllable current supply having a positive output and a negative output and being for supplying current to at most one of a first path and a second path, the first and second path each comprising, in use, a series arrangement of a switch and an LED string; the switches each having a respective input, output, and control terminal, the respective inputs being connected in common to a one of the outputs of the controllable current supply, and an open/closed switching status of each switch being selectable by a respective switching signal at its respective control terminal; wherein the second path switch control terminal is electrically coupled to the first path switch output such that the second switching signal is inverted relative to the first switching signal.
摘要:
A lightening apparatus includes light-emitting elements (P 1,1 , P 1,2, ···) arranged in a matrix. One of the light-emitting elements (P 2,1, P 2,2, ···) is located at each intersection between at least two first reference voltage lines (S2, S5) and "m" first drive voltage lines (Y1, Y2, ···). A first reference voltage driver (3) time-divisionally switches the first reference voltage lines (S2, S5). A first drive voltage driver (6) supplies first luminous drive voltages (B1, B2, ···; E1, E2, ···) to the first drive voltage lines (Y1, Y2, ···). One of the light-emitting elements (P 1,1, P 1,2, ···, P 3,1 ,P 3,2 ,···; P 4,1, P 4,2, ···) is located at each intersection between at least one second reference voltage line (S1, S3; S4) and "m" second drive voltage lines (X1, X2, ···; Z1, Z2, ···). A second reference voltage driver (2, 4) switches the second reference voltage line (S1, S3; S4). A second drive voltage driver (5, 7) supplies second luminous drive voltages (A1, A2, ···, C1, C2, ···; D1, D2, ···) to the second drive voltage lines (X1, X2, ···; Z1, Z2, ···).