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Light source regulation circuit for alternating current light-emitting diode

A light-emitting diode and light source adjustment technology, applied in the direction of light source, electric light source, point light source, etc., to achieve the effect of improving life, improving reliability and simple control

Inactive Publication Date: 2013-08-21
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In addition, in addition to the above three drive circuit architectures, if you want to use phase control technology for dimming AC LEDs, phase control technology must be added separately A zero-voltage detection circuit can operate normally, but it cannot perform real-time shutdown when the AC LED has a problem. Therefore, no matter whether the technology of the aforementioned patent or the phase control technology is used, it is also impossible to simultaneously detect the AC LED. Disadvantages of diode dimming and the inability to protect AC LEDs when the input voltage is too high

Method used

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  • Light source regulation circuit for alternating current light-emitting diode
  • Light source regulation circuit for alternating current light-emitting diode
  • Light source regulation circuit for alternating current light-emitting diode

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no. 1 example

[0078] see Figure 4A As shown, it is the first embodiment of an AC light-emitting diode (AC LED) light source adjustment circuit. The following will outline its circuit structure and working principle:

[0079] The light source adjustment circuit of AC light-emitting diode (AC LED) is AC power through the light source adjustment main circuit 42 (composed of D1, D2, D3, D4 and S1), and a pulse width modulation (PWM) control circuit 43 , to achieve the function of adjusting the output brightness of the AC LED 44 according to the fluctuation of the input power, so that the AC LED 44 can maintain a stable light source output even when the input power is unstable. By adjusting the external voltage signal Vext of the AC LED light source adjustment circuit, and comparing the external voltage signal Vext with the ramp generator 432 (Ramp Generator) of the triangular wave or sawtooth wave signal, dimming signals with different duty cycles are obtained. The dimming signal is then sent...

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PUM

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Abstract

The invention discloses a light source regulation circuit for an alternating current light-emitting diode, which is connected with an alternating current power supply and a plurality of alternating current light-emitting diodes. The light source regulation circuit comprises a light source regulation main circuit and a pulse width modulation control circuit, wherein the light source regulation main circuit is used for modulating the alternating current power supply and supplying the modulated power to the alternating current light-emitting diodes; and the pulse width modulation control circuitis used for changing input alternating current power supply, regulating an output light source of the alternating current light-emitting diodes to the preset brightness by regulating an external voltage signal in a circuit unit to fulfill the function of light source regulation and also enabling the alternating current light-emitting diodes to be in a complete close state by regulating the external voltage signal when the input power supply is overhigh, thereby avoiding burning of the alternating current light-emitting diodes and fulfilling the function of protection.

Description

technical field [0001] The invention relates to a light source adjustment circuit of an AC light emitting diode, especially a circuit that can directly adjust the brightness of an AC light emitting diode (AC LED), and can maintain a stable output brightness of an AC light emitting diode (AC LED) under changes in the input power supply voltage. The light source adjustment circuit. Background technique [0002] AC LED (AC LED) is a technology independently developed by my country. There is no patent right for DC LED. It needs to be authorized before it can be manufactured. The development of related technologies has gradually received attention. Unlike DC LEDs that require an alternating current (AC) to direct current (DC) power supply, AC LEDs have the advantage that they can be directly driven by an AC power source, and their conversion efficiency and reliability are higher than those of DC LEDs. . However, because the AC LED is directly connected to the AC power supply, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H02M1/08H02H3/20F21V23/00F21Y101/02
Inventor 蔡文田杨秉纯钟辉雄陈长岳陈一通黄耀德李丽玲
Owner IND TECH RES INST
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