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Universal LED simulation dimming circuit

An analog dimming and circuit technology, applied in the field of LED lighting, can solve the problems of inconvenient dimming control of LED drive circuits, restrictions on the wide application of LED drive schemes, and inability to realize changes in output current, achieving good isolation and good versatility , The effect of simplifying the circuit design

Inactive Publication Date: 2014-09-24
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the LED driver chip has no dimming interface, this driving scheme can achieve constant current output, but it cannot realize the change of the output current, and thus cannot realize the dimming of the LED.
[0006] To sum up, for the driving circuit composed of LED driver chip without dimming interface, it is impossible to realize the dimming requirement of LED, which brings inconvenience to the dimming control of LED driving circuit and restricts this kind of Wide application of LED driving scheme

Method used

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Examples

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Effect test

Embodiment 1

[0019] see Figure 4 , the general-purpose LED analog dimming circuit includes an active low-pass filter, an amplifier, a voltage regulator circuit and a linear optocoupler circuit in series, which convert the non-adjustable reference voltage of the current feedback channel in the current control loop of the LED drive circuit into a new The adjustable reference voltage can adjust the set value of the constant current in the LED constant current drive to realize analog dimming.

Embodiment 2

[0021] see Figure 6 , the present embodiment is basically the same as Embodiment 1, and the special features are: the active low-pass filter includes a resistor R1, a capacitor C2 and an operational amplifier UB, wherein the resistor R1 is connected to the constant reference voltage of the input terminal, and the capacitor One end of C1 is connected to resistor R1, the other end is grounded, the common end of capacitor C1 and resistor R1 is connected to the positive input end of operational amplifier UB, and the negative input end of operational amplifier UB is connected to the output to form a voltage follower. Make the reference voltage more stable and have better load matching ability.

[0022] Described amplifier comprises four resistors R2, R3, R4, R5, a capacitor C2, and operational amplifier UA, wherein resistance R2 is connected with the output of active low-pass filter and then connected to the positive input end of operational amplifier UA, operational amplifier Th...

Embodiment 3

[0026] like Figure 4 As shown, the analog dimming circuit module includes the following parts: active low-pass filter (1), reference voltage amplifier (2), voltage regulator (3), and linear optocoupler circuit (4).

[0027] The specific working principle of the LED analog dimming circuit is as follows: Figure 6 As shown: the active low-pass filter is composed of a resistor R1, a capacitor C2 and an operational amplifier UB. The active low-pass filter filters the input constant reference voltage to make the constant reference voltage more stable and Improve its load matching ability;

[0028] The amplifier is composed of four resistors R2, R3, R4, R5, a capacitor C2, and an operational amplifier UA. The amplifier is amplified with the constant reference voltage filtered by the active low-pass filter. The magnification is determined by the resistors R3 and R4. The amplified constant reference voltage has a better adjustment width and is adjusted by the linear optocoupler Th...

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Abstract

The invention relates to a universal LED simulation dimming circuit which comprises an active low-pass filter, an amplifier, a voltage regulator and a linear optical coupler circuit, wherein the active low-pass filter, the amplifier, the voltage regulator and the linear optical coupler circuit are connected in series sequentially. The universal LED simulation dimming circuit is suitable for simulation dimming of most LED constant current drive circuits and particularly suitable for the occasion that LED drive chips in the constant current drive circuits are not provided with dimming interfaces but lamps need dimming.

Description

technical field [0001] The invention belongs to the field of LED lighting. Aiming at the problem that some high-power LED constant-current drive circuits do not have dimming interfaces in their drive chips, the invention proposes a general-purpose LED analog dimming circuit with wide application range. Background technique [0002] (1) At present, the main schemes of LED drive circuit to realize dimming are as follows: figure 1 As shown, this solution requires the LED driver chip of the circuit to have a dimming interface: [0003] This solution is to use the dimming interface of the LED driver chip itself to realize the dimming function, such as figure 1 As shown, the PWM dimming interface of the LED driver chip is connected to the PWM signal with adjustable duty cycle, which is processed by the circuit inside the chip to adjust the current of the LED driver circuit; the same LED driver chip uses the analog dimming interface to receive The linear continuously adjustable ...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 刘廷章闫斌胡力元周颖圆
Owner SHANGHAI UNIV
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