CN203301806U - Automatic dimming signal lamp - Google Patents

Abstract

The utility model discloses an automatic dimming signal lamp, which is composed of VCC, a photosensitive element, a single chip microcomputer, a PWM pulse width modulation unit, an LED drive unit, and a light emitting unit; The single-chip microcomputer converts the ground voltage collected by the photosensitive element into analog-to-digital conversion into the feedback voltage of the photosensitive element, and the PWM pulse width modulation unit compares the feedback voltage of the photosensitive element with the preset brightness output threshold of the LED lamp. When the feedback voltage exceeds the corresponding threshold value, the corresponding output PWM signal with the same frequency and different duty cycle is sent to the LED drive unit at the output terminal, and the LED drive unit uses the PWM duty cycle to adjust the current transmitted to the LED lamp. The lighting power of the signal lamp of the utility model changes with the change of the ambient light intensity, thereby saving energy and increasing visual comfort.

Description

An automatic dimming signal lamp

technical field

The utility model relates to the technical field of signal lamps, in particular to an automatic dimming signal lamp.

Background technique

With the development of the world economy, the application fields of signal lights are also increasing, and the application of signal lights in the traffic field is not counted. Reduce the lighting power in areas with sufficient ambient light brightness, and increase the lighting power in areas with insufficient ambient light brightness, resulting in a waste of energy.

Utility model content

In view of the above-mentioned defects, the utility model provides an automatic dimming signal lamp, so that the lighting power of the signal lamp changes with the change of the ambient light intensity, so as to save energy and increase visual comfort.

In order to achieve the above object, the technical solution of the utility model is:

An automatic dimming signal lamp, comprising a reference power supply VCC connected in sequence, a photosensitive element, a single-chip microcomputer with a built-in digital-to-analog conversion unit, a PWM pulse width modulation unit, an LED drive unit, and a light-emitting unit; the light-emitting unit is composed of a plurality of LED lamps Composition, the reference power supply supplies a certain current to the light-emitting unit, the photosensitive element automatically monitors the light intensity information of the external natural light, and collects the voltage to the ground, and the single-chip microcomputer with the built-in digital-to-analog conversion unit converts the ground-to-ground voltage collected by the photosensitive element The voltage is converted into a feedback voltage of the photosensitive element through analog-to-digital conversion. The PWM pulse width modulation unit compares the feedback voltage of the photosensitive element with the preset brightness output threshold of the LED lamp. If it is detected that the feedback voltage of the photosensitive element exceeds the corresponding threshold value, at the output end, correspondingly output PWM signals with the same frequency and different duty ratios to the LED driving unit, and the LED driving unit uses the duty ratio of the PWM to adjust the magnitude of the current transmitted to the LED lamp.

Further, one end of the photosensitive element is connected in series with a voltage dividing resistor.

Further, the single-chip microcomputer with the built-in digital-to-analog conversion unit is an STM8S103 single-chip microcomputer with a 10-bit±1LSB ADC.

In the automatic dimming signal lamp of the utility model, the photosensitive element senses the light intensity information of natural light and then transmits it to the single-chip microcomputer, and the single-chip microcomputer generates a PWM signal to adjust the height of multiple LED lights after analysis and judgment, and reduces the lighting power in areas with sufficient ambient light brightness. Increase the lighting power in areas with insufficient ambient light, so as to save energy and increase visual comfort.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.

As shown in Figure 1, the automatic dimming signal lamp of the present utility model comprises a reference power supply VCC, a photosensitive element, a single-chip microcomputer with a built-in digital-to-analog conversion unit, a PWM pulse width modulation unit, an LED drive unit, and a light-emitting unit connected in sequence; The light-emitting unit is composed of a plurality of LED lamps, the reference power supply supplies a certain current to the light-emitting unit, the photosensitive element automatically monitors the light intensity information of external natural light, collects the ground voltage, and the built-in digital-to-analog conversion unit The single-chip microcomputer performs analog-to-digital conversion on the ground voltage collected by the photosensitive element and converts it into the feedback voltage of the photosensitive element. The PWM pulse width modulation unit compares the feedback voltage of the photosensitive element with the preset brightness output threshold of the LED lamp. When the feedback voltage of the photosensitive element exceeds the corresponding threshold value, the corresponding output PWM signal with the same frequency and different duty cycle is sent to the LED drive unit at the output terminal, and the LED drive unit uses the duty cycle of PWM to adjust the signal transmitted to the LED. The current size of the lamp.

One end of the photosensitive element is connected in series with a voltage dividing resistor to prevent the photosensitive element from being burnt due to too low resistance.

The single-chip microcomputer with the built-in digital-to-analog conversion unit is an STM8S103 single-chip microcomputer, which has a 10-bit ± 1LSB ADC.

The above is only a kind of embodiment of the present utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the premise of the technical principle of the present utility model, some improvements can also be made. It should be regarded as the protection scope of the present utility model.

Claims (3)

1. An automatic dimming signal lamp, characterized in that: the signal lamp circuit includes a reference power supply VCC, a photosensitive element, a single-chip microcomputer with a built-in digital-to-analog conversion unit, a PWM pulse width modulation unit, an LED drive unit, and a light-emitting unit connected in sequence; The light-emitting unit described above is composed of a plurality of LED lamps, the reference power supply supplies a certain current to the light-emitting unit, the photosensitive element automatically monitors the light intensity information of external natural light, and collects the ground voltage, and the built-in digital-to-analog conversion unit The single-chip microcomputer converts the ground voltage collected by the photosensitive element into analog-to-digital conversion into the feedback voltage of the photosensitive element, and the PWM pulse width modulation unit compares the feedback voltage of the photosensitive element with the preset brightness output threshold of the LED lamp. When the feedback voltage of the photosensitive element exceeds the corresponding threshold value, the corresponding output PWM signal with the same frequency and different duty cycle is sent to the LED drive unit, and the LED drive unit uses the PWM duty cycle to adjust the transmission to The current size of the LED lamp. 2. The automatic dimming signal lamp according to claim 1, characterized in that: one end of the photosensitive element is connected in series with a voltage dividing resistor. 3. The automatic dimming signal lamp according to claim 1 or 2, characterized in that: the single-chip microcomputer with the built-in digital-to-analog conversion unit is a STM8S103 single-chip microcomputer with a 10-bit±1LSB ADC.

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