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A switch segment dimming circuit for led drive

A technology of LED driving and segmented dimming, applied in the direction of electric light circuit layout, light source, electric light source, etc., can solve the problems of increasing the difficulty of LED lamps, LED lamps flickering, increasing harmonic coefficients, etc., to avoid flicker problems and electromagnetic the effect of interference

Active Publication Date: 2016-09-07
深圳天源中芯半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many disadvantages in thyristor dimming: first, the thyristor destroys the waveform of the sine wave, increases the harmonic coefficient, and reduces the power factor; second, the transmission of non-sinusoidal waveforms on the line will lead to large Third, a maintenance current is required after the thyristor is turned on. If the maintenance current is not enough, the conduction angle will be unstable, which will cause the LED light to flicker; fourth, the dimming of the thyristor requires a dedicated Thyristor dimmers need to be re-constructed, which increases the difficulty of popularizing LED lamps

Method used

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  • A switch segment dimming circuit for led drive
  • A switch segment dimming circuit for led drive
  • A switch segment dimming circuit for led drive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the first embodiment of the switch segment dimming circuit for LED driving in the present invention, the switch segment dimming circuit for LED driving includes a voltage power-off detection resistor R1, a detection Signal filter capacitor C2, a Zener diode ZD1, a power failure detection circuit, a power failure cycle counting circuit, a maintenance voltage generation circuit, a voltage maintenance capacitor C3, a gear selection circuit and an output current control circuit. One end of the voltage detection resistor R1 is connected to the positive pole of the rectifier bridge output, the other end of R1 is connected to the positive pole of the detection signal filter capacitor C2, the negative pole of the Zener diode ZD1 and the input end of the power failure detection circuit, and the detection signal filter capacitor C2 The negative pole and the positive pole of the Zener diode ZD1 are grounded; the output terminal of the power failure detec...

Embodiment 2

[0031] Such as figure 2 As shown, the second embodiment of the switch segment dimming circuit for LED driving according to the present invention, the difference between the second embodiment and the first embodiment is that the power supply pin VIN of the chip is separated from the power failure detection pin VDET The power failure detection resistor R1 and detection signal filter capacitor C2 are separated from the power supply resistor R2 and power supply filter capacitor C4 of the application circuit, and one end of the power failure detection resistor R1 is directly connected to one end of the AC input power supply.

Embodiment 3

[0033] Such as image 3 As shown, the third embodiment of the switching segmental dimming circuit for LED driving according to the present invention, the power input of the third embodiment is a DC input, and rectifier diodes D1-D4 are not required, and power supply resistors and power supply filter capacitors are not required. , no need for power failure detection resistors and detection signal filter capacitors, the input power is directly input to the power failure detection circuit after the switch K1 for power failure detection, and at the same time input to the chip to supply power to the internal circuit for other circuits.

[0034] Such as Figure 4As shown, it is an implementation circuit diagram of the power failure cycle counting circuit in the switch segment dimming circuit for LED driving according to the present invention, and the required number of D flip-flops is determined according to the required number of dimming gears. If n gears are required, n D flip-fl...

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Abstract

The invention discloses a switch piecewise dimming circuit used for LED drive. The circuit comprises a power supply outage detection circuit, a power supply outage cycle count circuit, a maintaining voltage generation circuit, a voltage maintaining capacitor, a gear selection circuit and an output current control circuit, wherein the power supply outage detection circuit is used for processing and judging a received power supply outage signal of a detection circuit, and when a power supply is cut off, a module outputs a POFF signal; the power supply outage cycle count circuit counts the POFF signal output by the power supply outage detection circuit and maintains a counting result Q(n:1) after the power supply is cut off; the maintaining voltage generation circuit is used for generating maintaining voltage; the gear selection circuit outputs corresponding reference voltage or reference current REF according to outage times Q(n:1); the output current control circuit outputs corresponding output current corresponding to Q(n:1) according to the reference voltage or the reference current REF. According to the switch piecewise dimming circuit, only a common switch needs to be used for repeat outage and electrification, the dimming function can be achieved, a special dimmer does not need to be used, and application and installation are easy.

Description

technical field [0001] The invention relates to a switch segment dimming circuit for general lighting, in particular to a switch segment dimming circuit for LED lighting applications. Background technique [0002] With the maturity of LED driving technology and the advantages of green environmental protection and energy saving of LED light sources, LED lighting is becoming more and more popular. In order to meet the adjustable brightness of LED lamps, various dimming methods have also been applied to LED lighting, among which the most widely used is thyristor dimming. [0003] However, there are many disadvantages in thyristor dimming: first, the thyristor destroys the waveform of the sine wave, increases the harmonic coefficient, and reduces the power factor; second, the transmission of non-sinusoidal waveforms on the line will lead to large Third, a maintenance current is required after the thyristor is turned on. If the maintenance current is not enough, the conduction a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 黄钦阳邓小兵张明明黄彬阳
Owner 深圳天源中芯半导体有限公司