LED single-segment constant-current light-modulation drive circuit and method

A technology of constant current dimming and driving circuit, applied in the field of lighting, can solve the problem that the driving circuit cannot realize constant current dimming, etc., and achieve the effects of low cost, improved performance and stable use

Inactive Publication Date: 2016-04-13
福建宏佳光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a LED single-segment constant current dimming d

Method used

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  • LED single-segment constant-current light-modulation drive circuit and method
  • LED single-segment constant-current light-modulation drive circuit and method
  • LED single-segment constant-current light-modulation drive circuit and method

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Embodiment 1

[0066] This embodiment provides a LED single-stage constant current dimming driving circuit, such as Figure 2a As shown, the LED single-stage constant current dimming driving circuit 200 is connected to the driving circuit of the LED light source, and the constant current dimming of the LED light source is realized by adjusting the current of the LED light source through closed-loop control. The driving circuit of the LED light source includes an LED light source 110 , a thyristor dimmer 120 , and a power supply 130 .

[0067] Such as Figure 2b As shown, the LED single-stage constant current dimming driving circuit 200 specifically includes: a current detection module 210 and a power adjustment module 220 .

[0068] The current detection module 210 compares the power supply voltage VDD of the LED single-stage constant current dimming driving circuit with an adjustable voltage VREF to obtain an error signal, and outputs the difference between the error signal and a reference...

Embodiment 2

[0081] This embodiment provides another LED single-segment constant current dimming driving circuit. For its application scenarios, refer to Figure 11 As shown, the LED single-stage constant current dimming driving circuit 400 is connected to the driving circuit of the LED light source, and the constant current dimming of the LED light source can be realized by controlling and adjusting the constant current of the LED light source.

[0082] Such as Figure 12 As shown, the LED single-stage constant current dimming driving circuit 400 specifically includes: a dimming signal acquisition module 410 and a transmission gate 420 .

[0083] The dimming signal acquisition module 410 is connected to the power supply 130 of the driving line of the LED light source, collects the phase-cutting signal of the thyristor dimmer in the driving line of the LED light source, and processes the tangential signal into Linear dimming control signal. The transmission gate 420 is connected to the d...

Embodiment 3

[0088] This embodiment provides a LED single-stage constant current dimming drive dimming method, which can be realized by the LED single-stage constant current dimming drive dimming circuit described in Embodiment 1, but the LED single-stage constant current dimming described in this embodiment The realization device of the segment constant current dimming driving dimming method includes but not limited to the LED single segment constant current dimming driving dimming circuit structure described in the first embodiment.

[0089] The LED single-stage constant current dimming drive dimming method is to adjust the current of the LED light source through closed-loop control to realize the constant current dimming of the LED light source, see Figure 14 shown, including:

[0090] S101. Comparing the power supply voltage of the LED single-stage constant current dimming driving circuit with an adjustable voltage to obtain an error signal, and outputting the difference between the e...

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PUM

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Abstract

The invention provides an LED single-segment constant-current light-modulation drive circuit and method, and the circuit is connected to an LED light source drive circuit. The circuit adjusts the current of an LED source through closed-loop control, and achieves the constant-current light modulation of the LED light source. The circuit specifically comprises a current detection module which compares a supply voltage of the circuit with an adjustable voltage, obtains an error signal, and outputs the difference between an error signal and a reference voltage, wherein the difference serves as a control voltage; and a power adjustment module which is connected with the negative electrode of the LED light source and the current detection module, collects the sampling voltage of the LED light source, compares the sampling voltage and the control voltage, outputs a constant-current control signal, controls the amplitude of the current passing through the LED light source, and controls the current to be a constant current when the adjustable voltage is constant. The circuit achieves a light modulation function of a single-segment LED light source under the condition of guaranteeing the constant drive of the single-segment LED light source, is small in size, is stable in use, is low in cost, and greatly improves the LED performances.

Description

technical field [0001] The invention belongs to the technical field of lighting, and relates to an LED drive circuit, in particular to an LED single-segment constant current dimming drive circuit and method. Background technique [0002] With the development of LED lighting technology, LED light source has been widely used in people's life and production. A commonly used LED lamp is mainly composed of three parts: LED light source, driving power supply and structural parts. In recent years, with the widespread application of LED lighting, especially the appearance of filament-shaped bulb lamps similar to incandescent lamps, they have attracted widespread attention from users. The cost of its single-segment LEDCHIP and structural parts has dropped to a level comparable to that of energy-saving lamps. Subsequently, the requirements for dimming performance and cost reduction of the driving power supply are becoming more and more urgent. Due to the small volume of the (incand...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 张高柏陈卫平
Owner 福建宏佳光电科技有限公司
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