Light wave breaker circuit and LED control circuit fabricated by using light wave breaker circuit

Abstract

The invention discloses a light wave breaker circuit, which comprises a diode D1, a diode D2, an inductor L1, an MOS tube Q1, a capacitor C1, a capacitor C2 and a capacitor C3. The invention further discloses an LED control circuit fabricated by using the light wave breaker circuit. The LED control circuit comprises an LED and a PWM control terminal; the PWM control terminal is used for modulating the LED in a PWM manner; and the light wave breaker circuit is also connected between the PWM control terminal and the LED. A PWM digital current for dimming is smoothly transformed and converted into an undistorted analogue current signal through the light wave breaker circuit, that is, a discontinuous signal is converted into a continuous signal, so that the technical problems are solved; the LED control circuit designed by using the light wave breaker circuit is simple in principle; and a PWM circuit capable of avoiding the technical problems is provided.

Description

Technical field [0001] The invention relates to a light wave interrupter circuit and an LED control circuit made by using the same. Background technique [0002] Smart homes are becoming more and more popular, especially represented by smart lighting. The main control chip controls the output of PWM pulse modulation signals to control various lighting methods of LEDs; however, in the process of popularization of this method, the applicant also Found some problems with this method, which are mainly attributed to the following four points: 1. Noise problem; 2. Light strobe problem; 3. Ghost image of illuminated objects; 4. IR infrared signal transmission interference problem; For problem 1, That is to say, a certain amount of noise will appear. In the past, people usually thought that these noises only originated from capacitors or transformers, and thus only improved capacitors and transformers. However, the applicant found that a certain amount of noise is not only from the tran...

AI Technical Summary

Problems solved by technology

[0002] Smart homes are becoming more and more popular, especially represented by smart lights, which control various lighting methods of LEDs through the control of the main control chip to output PWM pulse modulation signals; however, in the process of popularizing this method, the applicant also We found some problems with this method, which mainly come down to the following four points: 1. Noise problem; 2. Light strobe problem; 3. Ghosting of the illuminated object; 4. IR infrared signal transmission interference problem; for problem 1, That is, there will be a certain amount of noise. In the past, people usually thought that these noises only came from capacitors or transformers, so they only improved capacitors and transformers.

However, the applicant found that certain noise is not only from the transformer or capacitor, but also from the resonant noise of the lamp housing during PWM modulation.

For problem 2, the problem of light strobe, that is, the problem of constantly turning off the light, this is because PWM itself is a pulse modulation method similar to digital signals, so the stroboscopic problem is difficult to solve

For question 4, IR infrared signal transmission interference, through research, it is found that if PWM modulation is used, the receiving and transmitting distance of IR infrared signal will be greatly affected, but people did not know the reason in the past, the applicant found through years of research , this kind of problem is still due to the resonance of the lamp shell during PWM modulation, which has a major impact on the receiving and transmitting distance of IR infrared signals. Therefore, by integrating the above four main problems, it is necessary to design a simple plug-in circuit to interrupt This resonance creates the problem of a noise source as well as other issues mentioned above and a simple LED control circuit is designed using this interrupter circuit

Images