CN201178506Y - LED control device - Google Patents

Abstract

An LED control device relates to the technical field of lighting electronics, and solves the technical problem that the brightness decays faster when the LED is always on, thereby affecting its service life. The LED control device includes a power supply voltage stabilizing filter unit and an LED lamp, and also includes a single-chip microcomputer control unit capable of generating a variable square wave pulse with a high-frequency duty ratio. The pulse output end of the single-chip control unit is connected to the LED lamp through an electronic switch unit. The control unit is connected and powered by the power supply stabilization filter unit; the single-chip control unit controls the closing of the electronic switch unit through the high-frequency square wave pulse generated by it, so that the LED light can flash with the square wave pulse at high frequency. Utilizing the LED control device provided by the utility model can slow down the attenuation of the LED brightness, thereby prolonging its service life without affecting normal use.

Description

LED control device

technical field

The utility model relates to the technical field of lighting electronics, in particular to the technology of an LED control device.

Background technique

Due to the obvious advantages of LED in environmental protection and energy saving compared with traditional lamps, and its relatively long life, it has a wide range of uses, and LED products can be seen from industry to civilian use. However, due to the limitations of the LED manufacturing technology, when the LED is continuously lit for a long time, the brightness of the lamp will decay faster, thereby affecting the service life of the LED product.

Utility model content

Aiming at the defects in the above-mentioned prior art, the technical problem to be solved by the utility model is to provide an LED control device that does not affect its normal use, and can slow down the attenuation of LED brightness, thereby prolonging its service life.

In order to solve the above-mentioned technical problems, an LED control device provided by the utility model includes a power supply voltage stabilization filter unit and an LED lamp, and is characterized in that it also includes a single-chip microcomputer control device capable of generating high-frequency duty ratio variable square wave pulses. Unit, the pulse output end of the single-chip control unit is connected to the LED lamp through the electronic switch unit, the single-chip control unit is connected and powered by the power supply stabilization filter unit; the single-chip control unit controls the electronic switch unit through the high-frequency variable duty ratio square wave pulse generated by it The closure makes the LED light flash with the square wave pulse at high frequency.

Further, the electronic switch unit is composed of a triode and a MOS transistor connected to the triode.

Further, the single-chip microcomputer control unit is a single-chip microcomputer control unit capable of generating high-frequency variable duty ratio square wave pulses.

The LED control device provided by the utility model utilizes a single-chip microcomputer to generate a high-speed square wave pulse to drive the LED lamp, so that the LED lamp can flicker at high frequency, so that the LED lamp has a rest time and does not have to work in a constant light state, which prolongs the LED lamp. And because the human eye has a persistent visual effect, the high-frequency flashing LED light is always on in the human eye, which will not affect its normal use.

Description of drawings

Fig. 1 is the working principle block diagram of the LED control device of the utility model embodiment;

Fig. 2 is a circuit diagram of the LED control device of the embodiment of the utility model.

Detailed ways

The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present utility model. All similar structures and similar changes of the utility model should be included in the protection of the utility model. scope.

As shown in Figure 1, a LED control device provided by the utility model includes a power supply voltage stabilization filter unit and an LED lamp, and is characterized in that it also includes a single-chip microcomputer control unit capable of generating high-frequency duty-ratio variable square wave pulses , the pulse output end of the single-chip control unit is connected to the LED lamp through the electronic switch unit, the single-chip control unit is connected and powered by the power supply voltage stabilization filter unit; the single-chip control unit controls the electronic switch unit through the high-frequency duty ratio variable square wave pulse generated by it The closing of the LED light makes the LED light flash with the square wave pulse at high frequency. Because the human eye has a visual persistence effect, the high-frequency flashing LED light is always on in the human eye.

As shown in Figure 2, the power supply is filtered by the filter circuit composed of short-circuit protection device F1, reverse connection protection diode D1, and capacitors C1 and C2, and then connected to the voltage regulator chip U1, and then stabilized by U1 and the filter circuit composed of capacitors C3 and C4 After the secondary filtering, a stabilized filter unit is formed to provide a stable power supply to the microcontroller U2. The square wave pulse generated by the microcontroller U2 is connected to the base of the triode Q1 after passing through the resistor R2. The collector of Q1 is grounded, and the emitter is connected to the gate of the MOS tube Q2. Q2 The source is grounded and the drain is connected to the LED.

The single-chip microcomputer U2 controls the electronic switch (circuit) unit composed of the triode Q1, the MOS transistor Q2 and the resistor R1 through the base of Q1.

When the square wave pulse generated by the microcontroller U2 is at a high level, the transistor Q1 is turned on, so that the gate of the MOS transistor Q2 is at a low level, so that Q2 is cut off, and the LED is turned off.

When the square wave pulse generated by the microcontroller U2 is at a low level, the transistor Q1 is cut off, so that the gate of the MOS transistor Q2 is at a high level, so that Q2 is turned on, so that the LED is turned on.

Claims (3)

1. An LED control device, comprising a power supply voltage stabilizing filter unit and an LED lamp, is characterized in that: it also includes a single-chip microcomputer control unit capable of generating high-frequency pulses, and the pulse output end of the single-chip microcomputer control unit is connected to the LED lamp through an electronic switch unit, The single-chip microcomputer control unit is connected and powered by the power supply stabilizing filter unit. 2. The LED control device according to claim 1, wherein the electronic switch unit is composed of a triode and a MOS transistor connected to the triode. 3. The LED control device according to claim 1, wherein the single-chip microcomputer control unit is a single-chip microcomputer control unit capable of generating square wave pulses with a high-frequency variable duty ratio.

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