A linear led drive circuit for thyristor dimming

A technology of LED drive and drive circuit, applied in the direction of light source, electric light source, electrical components, etc., can solve the problem of switch flicker, etc., and achieve the effect of smooth dimming effect and excellent dimming effect.

Inactive Publication Date: 2018-03-30
成都锦瑞芯科技有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

[0009] In view of the above prior art, the purpose of the present invention is to provide a linear LED drive circuit for thyristor dimming, which solves the overshoot flicker at the turn-on moment of the prior art and the switch caused by repeatedly switching channels when the critical voltage reaches Technical problems such as flickering

Method used

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  • A linear led drive circuit for thyristor dimming
  • A linear led drive circuit for thyristor dimming
  • A linear led drive circuit for thyristor dimming

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Embodiment 1

[0047] The main circuit adopted in the present invention includes a bus voltage sampling integration circuit, a bus voltage signal processing circuit, a thyristor maintaining current circuit, and an LED constant current control circuit.

[0048] Such as figure 1 As shown, R1 / R2 / C1 forms a bus voltage sampling integration circuit. The main function of the circuit is to divide the bus voltage and integrate it through RC to obtain a stable DC voltage and send it to the LN terminal. The signal LN will be used to control the switching control between the SCR maintaining current circuit and the LED constant current control circuit. The advantage of using the integral circuit is that it can effectively avoid the LED light from being turned on by mistake due to the surge voltage at the moment the thyristor is turned on, and it is easy to see the light flickering phenomenon. At the same time, during the dimming process, if there is no processing by the integrating circuit, the LED li...

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PUM

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Abstract

A linear LED drive circuit for thyristor dimming, the invention relates to the technical field of LED drive circuits, and solves the overshoot flicker at the turn-on moment of the prior art and the switch flicker caused by repeatedly switching channels when the critical voltage reaches, etc. technical problem. The present invention mainly includes a power supply, a thyristor switch circuit and a rectifier bridge, constituting a thyristor drive power supply circuit; an integrating circuit, including a power supply potential point and a sampling potential point whose voltage values ​​are successively reduced, and the output terminal of the rectifier bridge is connected to the power supply potential point; The drive circuit includes a switch control processing circuit, and the switch control processing circuit controls the first switch transistor of the discharge channel of the drive circuit and the second switch transistor of the LED channel of the drive circuit to turn on or off through the sampling potential point voltage; the switch control process The circuit includes a hysteresis comparator, the input terminal of the hysteresis comparator is connected to the sampling potential point; the highest potential point of the LED lamp is connected to the output terminal of the rectifier bridge. The invention is used for LED drive circuit design.

Description

technical field [0001] The invention relates to the technical field of LED driving circuits, in particular to a linear LED driving circuit for dimming with silicon controlled rectifiers. Background technique [0002] In the LED linear drive structure, the circuit used for thyristor dimming is commonly seen as Figure 12 shown. The thyristor discharge circuit is usually a separate discharge circuit, which discharges through the BLD channel, while the LED current passes through another channel. When the thyristor switch is turned on, because the voltage above the bus voltage is not high enough, the LED channel cannot be turned on. At this time, the BLD channel is turned on to provide the maintenance current of the thyristor switch. As the conduction angle of the thyristor switch increases, when the bus voltage is high enough, the LED channel starts to conduct. Generally, the voltage of VREF1 is set to be lower than the voltage of VREF2 inside the IC, so when the current of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00Y02B20/30
Inventor 孙晓良俞德军
Owner 成都锦瑞芯科技有限公司
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