A Single-Wire RF Dimmer Based on Microcontroller

Abstract

The invention relates to a single-wire-system radio-frequency light modulator based on a microcontroller, and the single-wire-system radio-frequency light modulator is characterized by comprising a power supply module, a single chip microprocessor, a radio frequency module, a zero-passage detection circuit, a phase-control light modulation circuit, a drive circuit and a sampling and over-current detection protection circuit, wherein the power supply module is used for powering the light modulator through leak current of a live wire; the radio frequency module is connected with the single chip microprocessor and used for receiving a radio frequency remote control signal; the zero-passage detection circuit is used for detecting and transmitting an alternative-current zero-passage signal of the live wire to the single chip microprocessor; the phase-control light modulation circuit adopts two insulated gate bipolar transistors (IGBT) to control the cutting of a positive-phase and a negative-phase waveform of the live wire power supply so as to change an effective value of the power for a lamp; the single chip microprocessor controls the phase-control light modulation circuit through the drive circuit; and the sampling and over-current detection protection circuit is used for detecting current flowing through the IGBT so as to avoid the burning of the IGBT. Due to the adoption of the single-wire-system radio-frequency light modulator based on the microprocessor, the problems that the existing light modulator suffers severe electromagnetic interference (EMI) and does not support the radio frequency remote-control light modulation and the single-wire-system working condition can be solved, the circuit structure is simple, and a good market value can be realized.

Description

technical field [0001] The invention relates to a dimming controller, in particular to a microcontroller-based single-wire radio frequency dimmer. Background technique [0002] At present, dimming controllers are widely used in various fields. Most of the most common dimmers on the market adopt phase-controlled dimming operation, and currently support single live wire power supply. The phase control dimming controller cuts the sinusoidal voltage wave of the power supply with different phase angles according to the brightness requirements, thereby changing the effective value of the output voltage to adjust the brightness of the lamp. [0003] According to the cutting method, it can be divided into leading-edge phase-controlled dimming and trailing-edge phase-controlled dimming. The adjustment device used in leading-edge phase-controlled dimming is a thyristor, and the trailing-edge phase-controlled dimming uses IGBT transistors. Regardless of the leading edge phase cont...

AI Technical Summary

Problems solved by technology

Regardless of the leading edge phase control or the trailing edge phase control, after cutting the sine wave, high-order harmonics will be generated through the circuit, which will interfere and affect the power system or affect the work of other electronic equipment

[0004] In addition, most of the dimming products currently on the market use potentiometers to adjust the dimming operation. Although the dimming is accurate, it is still inconvenient in some occasions.

However, the infrared remote control method is used for dimming. The remote control and the dimmer must face each other in a straight line, and there must be no obstructions in the middle. The dimming method still cannot meet the flexible and changeable requirements.

The lack of support for single live wire power supply makes it difficult for dimmers to quickly popularize and replace traditional switch boxes

[0005] And when targeting high-power lamps, there is a lack of favorable power limiting protection measures. In the case of overcurrent, it is easy to burn the thyristor or IGBT transistor, resulting in paralysis of the circuit.

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