Apparatus for driving light-emitting diode strings using high voltage
A technology of light-emitting diodes and voltages, which is applied in the directions of electric light sources, lighting devices, and electric lamp circuit layouts, etc., can solve the problems of difficulty in reducing the volume, reducing the efficiency of light-emitting diode lighting equipment, and increasing the cost.
Inactive Publication Date: 2017-03-22
VASTVIEW TECH
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Problems solved by technology
Because of the need for such a voltage conversion device, the efficiency of light-emitting diode-based lighting equipment is reduced, the cost is increased, and it is difficult to reduce its size
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[0046] This specification provides accompanying drawings for a better understanding of the present invention, and the accompanying drawings also constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
[0047] figure 1 It is a block diagram showing an apparatus for driving LED strings with high voltage according to the first preferred embodiment of the present invention. The device of this embodiment comprises a plurality of LEDs connected in series and is divided into a plurality of LED segments 100 connected in series, each LED segment 100 has a positive terminal and a negative terminal, each connected to a leading LED the negative terminal of a segment and the positive terminal of a subsequent LED segment.
[0048] Such as figure 1 As shown, the negative terminal of each LED segment is also connected to the first connection terminal of a three-connect...
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A device for driving light-emitting diode string with high-voltage applied comprises a plurality of light-emitting diodes which are divided into a plurality of light-emitting diode sections connected in series, and a plurality of current limiters which respectively comprise three connecting ends and are controlled by voltage. Each current limiter corresponds to one light-emitting diode section, each first connecting end is connected with the negative end of the corresponding light-emitting diode section, a bias voltage is applied to each second connecting end, the third connecting ends are connected to a common node in a light-emitting diode device, and the common node is connected to the ground through a current source. A power loss reducing circuit of the light-emitting diode sections is further added between the common node and the current source to reduce the power loss, caused by the high voltage at the common node, of the current source, wherein the power loss reducing circuit is controlled by a light-emitting diode control circuit.
Description
technical field [0001] The present invention relates to a light emitting diode (LED) lighting device, especially a driving device for a lighting device using a high voltage LED string. Background technique [0002] Light-emitting diode (LED) is a semiconductor-based light source, which is often used in low-power consumption meters and indicators of home appliances. The application of light-emitting diodes in various lighting devices has become more and more common. For example, high-brightness light-emitting diodes have been widely used in traffic lights, vehicle lights, and brake lights. In recent years, lighting fixtures using strings of high-voltage LEDs have also been developed to replace traditional incandescent and fluorescent bulbs. [0003] The current-to-voltage (I-V) characteristic curve of a light-emitting diode is similar to that of an ordinary diode. When the voltage applied to the light-emitting diode is less than the forward voltage of the diode, only a very ...
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IPC IPC(8): H05B37/02
Inventor 朱弘琦林丈枨沈毓仁
Owner VASTVIEW TECH