CN201937901U - Intelligent constant-voltage type light emitting diode (LED) dimming controller - Google Patents

Abstract

The utility model relates to an intelligent constant-voltage LED dimming controller, which comprises a dimming drive circuit. The dimming drive circuit includes a power conversion module connected in sequence, a MUC microprocessor control module, an output dimming control module, and a MUC The microprocessor control module is connected with a constant voltage control module, which is characterized in that: the input end of the output dimming control module is also connected with the output end of the PWM signal module, the output end of the constant voltage control module is connected with a constant voltage LED, and the constant voltage control module The module controls the output dimming control module according to the control signal of the PWM signal module to realize LED dimming. The dimming controller described in the utility model adopts a constant voltage driving mode, and the efficiency is more than 90%; it has high intelligence, can be remotely controlled, and is compatible with RS485 interface and DMX-512 interface; and uses a microcontroller to output PWM control signals to achieve PWM all-digital dimming, and then make high-power LED brightness dimming in the full range (0%~100%), which can effectively save energy.

Description

An Intelligent Constant Voltage LED Dimming Controller

technical field

The utility model relates to the field of intelligent lighting, in particular to an intelligent constant voltage LED dimming controller.

Background technique

As a new type of high-efficiency solid-state light source, LED has the characteristics of energy saving, environmental protection, long life, and small size. It is widely used in various indications, displays, decorations, backlights, general lighting, and urban night scenes.

In the prior art, most of the LED dimming is achieved by changing the voltage or current at the two ends of the LED to achieve the purpose of dimming, that is, analog dimming. The voltage and current cannot realize the full range and average brightness adjustment from 0-100%, and the current and voltage of the LED are often changed, which has a great impact on the life of the LED. There are also some schemes that use PWM dimming, but due to the long delay in the response time of the LED driver to the PWM dimming signal, the dimming accuracy is low, and the best dimming effect cannot be achieved.

In terms of control, many of them now use manual dimming, which is quite inconvenient to use, and there is no way to use time control.

Contents of the invention

The problem to be solved by the utility model is to provide an LED dimming controller which is efficient, stable and capable of changing brightness from 0% to 100%.

According to the above-mentioned problems to be solved, the technical solution adopted by the utility model is: provide an intelligent constant voltage LED dimming controller, including a dimming drive circuit, and the dimming drive circuit includes a power conversion module, a MUC connected in sequence Microprocessor control module, output dimming control module, MUC microprocessor control module is connected with a constant voltage control module, the input end of the output dimming control module is also connected to the output end of the PWM signal module, and the output end of the constant voltage control module It is connected with the constant-voltage LED, and the constant-voltage control module controls the output dimming control module to realize LED dimming according to the control signal of the PWM signal module.

Specifically, the PWM signal is simulated and generated by a common IO port of the MUC microprocessor.

Specifically, the output drive module includes an integrated field effect transistor with low internal resistance, the integrated field effect transistor has low internal resistance, and is grounded through a resistor, so as to avoid power-on is that the MUC microprocessor control module outputs a high level The instantaneous turn-on of the field effect tube caused by it.

Preferably: the LED dimming controller further includes a signal connection with the MUC microprocessor control module for receiving remote control commands, and then controls the dimming drive circuit through the MUC microprocessor control module to realize the bus communication circuit for LED dimming;

The communication circuit is compatible with the RS485 interface and the DMX512 interface, and the interface is used to receive control commands from other controllers, thereby realizing intelligent control and dimming.

Compared with the prior art, the utility model has the beneficial effects of:

(1) The utility model adopts the drive method of low internal resistance integrated field effect tube, the internal resistance is less than 10MR, and the power conversion efficiency is over 90%;

(2) The utility model has high intelligence, can be remotely controlled, is compatible with RS485 interface and DMX-512 interface, and can flexibly realize point control, group control, time control, scene control, sensor automatic control and computer centralized control through bus control ;

(3) The utility model adopts MUC microprocessor to output PWM control signal to realize PWM full-digital dimming, and then make high-power LED brightness dimming in the full range (0%~100%), which can effectively save energy;

(4) The single-channel drive capability of the utility model is strong, which avoids the disadvantages of troublesome wiring, large wire consumption and heavy pollution of traditional wiring.

Description of drawings

Fig. 1 is a schematic block diagram of the utility model principle;

Fig. 2 is the circuit principle diagram of the utility model power conversion module;

Fig. 3 is the schematic diagram of the circuit principle of the embodiment of the utility model;

Fig. 4 is a schematic diagram of the bus communication circuit of the present invention.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the utility model is described in further detail below in conjunction with the accompanying drawings:

As shown in Figure 1, an intelligent constant voltage LED dimming controller includes a dimming drive circuit, and the dimming drive circuit includes a power conversion module, a MUC microprocessor control module, and an output dimming control module connected in sequence , The MUC microprocessor control module is connected with a constant voltage control module, the input terminal of the output dimming control module is also connected with the output terminal of the PWM signal module, the output terminal of the constant voltage control module is connected with the constant voltage LED, and the constant voltage control module According to the control signal of the PWM signal module, the output dimming control module is controlled to realize LED dimming.

The utility model embodiment circuit principle diagram is as shown in Figure 2. The DC power supply is output to the voltage stabilizing circuit after the rectification and filtering circuit composed of capacitors C6 and C7. The voltage stabilizing circuit is mainly composed of a power supply integrated chip U3 (LM2575HV-5.0), which supplies the working power of the subsequent circuit after the voltage stabilizing circuit and provides it to the MUC. Microprocessor and corresponding chips.

The integrated field effect transistor Q1 and corresponding peripheral circuits form an output dimming control module, the output drive module includes an integrated field effect transistor Q1 with low internal resistance; the source of the integrated field effect transistor Q1 is grounded through a resistor R6.

The utility model can include a multi-channel dimming driving circuit, which can respectively form multi-channel dimming by connecting with a plurality of I/O ports of the MUC microprocessor.

When the utility model works, the integrated field effect transistor Q1 controls its own conduction and cut-off by sampling the signal of the common terminal of the MUC microprocessor. When the integrated FET is turned on, the current flows from the power supply through the LED lamp to the negative pole of the power supply. Since the LED lamp is connected in series with the integrated FET, the current on the LED lamp is equal to the average current of the inductor, and different average currents make the LED lamp emit light with different brightness to realize LED dimming.

FIG. 3 is a schematic diagram of an embodiment of the bus communication circuit of the dimming controller. In the figure, U1 is a communication chip. Pins 1 and 4 of U1 are connected to the MUC microprocessor circuit. The communication chips 485A and 485B receive remote control signals and transmit them to the MUC microprocessor, which is decoded and controlled by the MUC microprocessor to output dimming control modules. Dimming. The bus communication circuit is compatible with RS485 interface and DMX512 interface.

The above embodiments are only the preferred implementation of the utility model, and can not be used to limit the utility model. Under the premise of not falling off the concept of the utility model, any equivalent replacement and minor changes made to it belong to the utility model scope of protection.

Claims (6)

1. An intelligent constant voltage type LED dimming controller, comprising a dimming drive circuit, said dimming drive circuit comprising a power conversion module connected in sequence, a MUC microprocessor control module, an output dimming control module, and a MUC microprocessor The controller control module is connected with a constant voltage control module, which is characterized in that: the input end of the output dimming control module is also connected with the output end of the PWM signal module, and the output end of the constant voltage control module is connected with a constant voltage LED. The control signal of the PWM signal module controls the output dimming control module to realize LED dimming. 2. The intelligent constant voltage LED dimming controller according to claim 1, wherein the PWM signal module is generated by a MUC microprocessor. 3. The intelligent constant voltage LED dimming controller according to claim 1 or 2, characterized in that: the LED dimming controller further includes a signal connection with the MUC microprocessor control module for receiving remote control commands, Furthermore, the dimming drive circuit is controlled by the MUC microprocessor control module to realize the bus communication circuit for LED dimming; the communication circuit is compatible with the RS485 interface and the DMX512 interface. 4. The intelligent constant voltage LED dimming controller according to claim 4, wherein the bus communication circuit is compatible with RS485 interface and DMX512 interface. 5. The intelligent constant voltage LED dimming controller according to claim 1, wherein the constant voltage control module includes an integrated field effect transistor Q1, and the PWMD terminal of the Q1 is connected to a PWM signal module. 6. The intelligent constant voltage LED dimming controller according to claim 4, characterized in that: said integrated field effect transistor Q1 terminal is grounded through a parallel pull-down resistor R6.

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