Unlock instant, AI-driven research and patent intelligence for your innovation.

Intelligent LED lamp dimming system

An LED lamp, intelligent technology, applied in the field of intelligent lamps, can solve the problems of complex circuit, difficult to achieve accurate dimming, etc., to achieve the effect of improving accuracy

Inactive Publication Date: 2020-05-05
WUHAN CHANGHENG TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of PWM dimming is to provide high-quality light and precise dimming. Its disadvantage is that it needs a peripheral circuit that can generate PWM control signals, and the circuit is relatively complicated; the working principle of analog dimming is to adjust the forward current flowing through the LED. to adjust the brightness of the LED
The inductance value measurement circuit is simple and the dimming is convenient, but it is difficult to achieve precise dimming
Most of the existing technologies use digital dimming or analog dimming, without combining the advantages of the two to avoid disadvantages. Therefore, in order to solve the above problems, the present invention provides an intelligent LED lamp dimming system, combined with analog dimming technology and digital dimming technology to achieve the purpose of simple circuit structure and precise dimming

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Intelligent LED lamp dimming system
  • Intelligent LED lamp dimming system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, an intelligent LED lamp dimming system of the present invention includes a power supply, a processor, a dimming module and an intelligent LED, wherein the dimming module includes an inductance value measuring circuit, a first comparator, a gate driver, a MOS Tube and buffer; the specific connection relationship is: the power supply is electrically connected to the input terminal of the inductance value measurement circuit and the inverting input terminal of the first comparator, and the output terminal of the inductance value measurement circuit is electrically connected to the smart LED lamp. The non-inverting input terminal of the first comparator is electrically connected with the output terminal of the inductance value measuring circuit, the output terminal of the first comparator is electrically connected with the grid of the MOS transistor through the gate driver, the source of the MOS transistor is grounded, and the MOS transistor The d...

Embodiment 2

[0032] On the basis of Embodiment 1, this embodiment provides a protection scheme for intelligent LED lamps. Specifically, on the basis of Embodiment 1, a second comparator and a bandgap reference are added; wherein, as figure 2 As shown, the power supply is electrically connected to the input terminal of the bandgap reference, the output terminal of the bandgap reference is electrically connected to the non-inverting input terminal of the second comparator, and the inverting input terminal of the second comparator is electrically connected to the power supply. The output terminal of the second comparator is electrically connected with the gate of the MOS transistor through the gate driver.

[0033] Wherein, the second comparator and the bandgap reference form an undervoltage lockout circuit. When the input voltage of the power supply is lower than a certain value, the gate driver does not work and is in a protection state.

[0034] Beneficial effects of this embodiment: By s...

Embodiment 3

[0036]On the basis of Embodiment 1 or Embodiment 2, this embodiment is provided with an illumination intensity detection circuit and an infrared pyroelectric circuit electrically connected to the I / O port of the processor, respectively.

[0037] Further preferably, the light intensity detection circuit includes a resistor R19 and a photosensitive resistor R20; the power supply is electrically connected to one end of the resistor R19, and the other end of the resistor R19 is respectively electrically connected to the I / O port of the processor and one end of the photosensitive resistor R20, The other end of the photoresistor R20 is grounded. The resistance of the photoresistor R20 will change due to the different intensity of incident light. Under relatively strong light conditions, the resistance value will vary from hundreds to thousands of ohms. In dark conditions, the resistance value is 1~ 10MΩ. The light intensity detection circuit converts different resistance changes in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an intelligent LED lamp dimming system. An inductance value measuring circuit, a first comparator, a gate driver and an MOS transistor are arranged to form a switching circuit to charge and discharge an inductor, inductance constant-voltage discharge time is measured, and forward current flowing through the intelligent LED lamp can be roughly adjusted by adjusting the resistance value of a current sampling resistor in the inductance value measuring circuit, so that the brightness of the intelligent LED lamp is adjusted. By arranging a PWM regulation and control circuit composed of a buffer, the gate driver and the MOS transistor, the current flowing through the intelligent LED lamp can be adjusted at the precision of 0.39% between the maximum current and 0 by adjusting the duty ratio of PWM; and a second comparator and a band-gap reference are arranged to form an under-voltage locking circuit, so that when the input voltage of the power supply is lower than a certain value, a post-stage circuit can be protected from acting.

Description

technical field [0001] The invention relates to the field of intelligent lights, in particular to an intelligent LED light dimming system. Background technique [0002] The full name of LED is "Light emitting diode", also known as light emitting diode, which is a solid electroluminescent semiconductor device that converts electrical energy into light energy. At present, there are mainly two kinds of dimming technologies: digital dimming and analog dimming. Among them, digital dimming is also called PWM dimming. to adjust the output average current. The advantage of PWM dimming is to provide high-quality light and precise dimming. Its disadvantage is that it requires a peripheral circuit that can generate PWM control signals, and the circuit is relatively complicated; the working principle of analog dimming is to adjust the forward current flowing through the LED. to adjust the brightness of the LED. The inductance value measurement circuit is simple and the dimming is con...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H05B45/34
CPCY02B20/30
Inventor 曾凡龙
Owner WUHAN CHANGHENG TECH