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High-resolution LED dimming control circuit

A dimming control circuit, high-resolution technology, applied to electrical components, etc., can solve problems such as light jitter and unstable light

Inactive Publication Date: 2020-10-27
安徽乐图电子科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention discloses a high-resolution LED dimming control circuit, which is used to solve the problem of illuminance, stable lighting of LED lighting beads, no unstable lighting caused by high-frequency intermittent work, and high-power lighting In the control circuit, the problem of light jitter under low brightness conditions

Method used

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  • High-resolution LED dimming control circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Disclosed in this embodiment as figure 1 A high-resolution LED dimming control circuit shown includes a control center, a high-frequency switching power supply LED drive circuit, a current sampling circuit and a control loop, a voltage sampling and a control loop, and a MOS tube switch. When the control circuit starts, If there is no load, it performs loop control on the LED drive of the high-frequency switching power supply according to the initial value preset by the control center, and outputs the constant voltage mode;

[0038]When the control circuit is not no-load, when the output current reaches the CC_REF value preset by the control, the constant current working mode is output;

[0039] When the external dimming signal is connected to DIMM_IN, the control circuit judges the dimming signal, selects the matching mode, and changes the output current by changing the value of the CC_CONTROL pin to realize dimming.

[0040] The control center includes analog / digital ...

Embodiment 2

[0057] This embodiment discloses the first part of the high-resolution LED dimming control circuit, such as figure 2 The EMI filter circuit shown is composed of CX1, L1, L2, and CX2, which can reduce the CE interference of the power supply to the power grid, and the RE interference to the space, and improve the CS and RS interference immunity.

[0058] The rectification filter circuit is composed of DB1 and C1, which rectifies the input alternating current into direct current;

[0059] After being controlled by U1, L3-A, L5-A, D2, Q1, EC1 and their peripheral circuits, the input voltage is boosted to a constant voltage of 400V;

[0060] K1-B, K1-A circuits and their peripheral circuits, after the control power supply starts, the thermistor RT1 is short-circuited by the relay, which has improved the efficiency of the whole machine; the circuit samples the voltage at the input terminal through the capacitors R50, R51, R52, R40, and C47. When the input voltage drops or the mach...

Embodiment 3

[0063] This embodiment discloses the second part of the high-resolution LED dimming control circuit, such as image 3 The LLC primary side power loop is composed of U2, Q2, Q3, T1, C6A, C6B and their peripheral circuits, and the MOS tube is in zero-voltage open state, which greatly reduces the switching loss of Q2 and Q3 and improves the whole machine. efficiency.

[0064] P1 is the secondary voltage and current sampling feedback closed-loop control optocoupler, and adjusts the operating frequency of the LLC circuit in real time according to the output load to achieve the purpose of stabilizing the output voltage.

[0065] P2 is the output overvoltage protection control optocoupler. When the output is overvoltage, the P2 transistor side is turned on, and the 15V voltage is limited and then poured into the 8 pin of the chip, and the VCC input of the chip is turned off, so that the chip turns off the output.

[0066] The second part of the circuit service control circuit works ...

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Abstract

The invention relates to the technical field of intelligent lighting, in particular to a high-resolution LED dimming control circuit which performs loop control on a high-frequency switching power supply LED drive according to an initial value preset by a control center and outputs a constant-voltage mode if the control circuit is no-load when started. When the control circuit is not in a no-loadstate, when the output current reaches a preset CC_REF value, a constant-current working mode is output. After an external dimming signal is accessed to the DIMM_IN, the control circuit judges the dimming signal, selects a matched mode, and changes the magnitude of the output current by changing the value of the CC_CONTEROL pin to realize dimming. According to the invention, an existing most advanced topological circuit is utilized to realize ultra-high-efficiency power supply driving, a high-efficiency topological structure is avoided, the problems that the illumination effect and the light jitter of the illumination control circuit are influenced when the illumination control circuit works intermittently in an output low-power standby state are solved, the light smoothness is close to the sunrise and sunset effects, and the illumination experience is improved.

Description

technical field [0001] The invention relates to the technical field of intelligent lighting, in particular to a high-resolution LED dimming control circuit. Background technique [0002] In the prior art, the dimming control of the lighting control circuit is mostly carried out in the form of constant voltage PWM wave or constant current. [0003] Using constant voltage PWM chopping to achieve dimming, the accuracy is not ideal, and the illuminating and luminous lamp beads work in a high-frequency switching state. In practical applications, although the human eye cannot recognize them, it is suitable for some animals and animals that require lighting + electronic monitoring. In the scene, it affects the experience and effect of actual use. [0004] There are two types of constant current dimming on the market. One is to make the lighting beads work in an intermittent state, which will not only generate a lot of noise, but also produce a phenomenon similar to constant voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/34H05B45/345
CPCH05B45/34H05B45/345
Inventor 张文
Owner 安徽乐图电子科技股份有限公司
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