Variable-frequency dimming control device for light-emitting diodes (LEDs) and operating method of variable-frequency dimming control device
A light-emitting diode and dimming control technology, which is applied to lighting devices, light sources, electric light sources, etc., can solve the problems of increased cost of parts
Inactive Publication Date: 2012-11-21
DELTA ELECTRONICS INC
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Problems solved by technology
However, since each LED light string needs to use a transistor as a control switch, when the number of LED light strings is quite large, a considerable number of transistors must be used, which will also cause the disadvantage of increasing the cost of parts.
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[0060] Hereby, the technical content and detailed description of the present invention are described as follows in conjunction with the accompanying drawings:
[0061] See figure 2 It is a circuit diagram of a first embodiment of a variable frequency dimming control device for light emitting diodes according to the present invention. The variable frequency dimming control device for light-emitting diodes provides current-controlled dimming operations for a plurality of light-emitting diodes 50 . The frequency conversion dimming control device includes a DC-AC converter 10 , a resonant circuit 20 , a transformer 30 , a rectifier circuit 40 , a current detection unit 60 and a control unit 70 .
[0062] In the present invention, the DC-AC converter 10 can be a half-bridge DC / AC converter, a full-bridge DC / AC converter, or A class-E converter, but not limited thereto. Moreover, in this embodiment, a half-bridge DC-AC converter will be described as the DC-AC converter 10, and a...
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A variable-frequency dimming control device for LEDs and an operating method of the variable-frequency dimming control device can provide dimming operation for a plurality of LEDs. The variable-frequency dimming control device comprises a direct current-alternating current converter, a resonant circuit, a transformer, a current detection unit and a control unit. The direct current-alternating current converter receives and converts direct current input voltage into alternating current voltage. The resonant circuit is electrically connected with the direct current-alternating current converter so as to receive and convert the alternating current voltage into resonant voltage. The transformer receives the resonant voltage and outputs alternating current driving voltage. The current detection unit is electrically connected with a secondary side winding of the transformer so as to output current frequency signals. The control unit is electrically connected with the current detection unit and the direct current-alternating current converter so as to receive dimming control signals and provide current control dimming operation for LEDs.
Description
technical field [0001] The invention relates to a dimming control device and an operation method thereof, in particular to a frequency conversion dimming control device of a light emitting diode and an operation method thereof. Background technique [0002] The status of light emitting diode (LED) used in the backlight source of portable electronic products has been unshakable. In the field of lighting, LED is the most critical component of semiconductor lighting, and it has many advantages, such as energy saving, environmental protection, long life, maintenance-free ... and so on. And LED drive circuit is an important part of LED products, no matter in the field of lighting, backlight or display panel, the choice of drive circuit technology architecture should match the specific application. Among them, the backlight module is a key component for driving the light source in the flat-panel display technology. It determines the reliability and stability of the brightness of ...
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IPC IPC(8): G09G3/34H05B37/02
Inventor 张世贤柯柏年
Owner DELTA ELECTRONICS INC