Dimming method of phase-cut dimming control circuit based on LED lamp

Abstract

The invention discloses a phase-sectioning dimming control circuit for an LED lamp and a dimming method of the phase-sectioning dimming control circuit. A logic circuit in the circuit is used for performing multiplication on error amplification signals of input voltages and output currents collected after rectification, phase sectioning is performed on collected rectification voltage signals after phase sectioning is performed on the input voltages, obtained phase-sectioning signals are used for controlling breakover time of a field-effect tube after multiplication is performed on the rectification voltage signals and the output signals of an error amplifier, and the larger the phase sectioning angle is, the smaller the energy transmitted by a transformer is. When a load is constant-voltage characteristic load, output voltages are reduced in the phase sectioning process; when the load is a constant-current characteristic load, the output currents are reduced in the phase sectioning process. According to the phase-sectioning dimming control circuit and the dimming method, on the basis of constant-voltage and constant-current control over power output, the phase-sectioning dimming function is achieved through dummy loads, signal collecting, processing and other means, and therefore the whole circuit system achieves the purpose of compatibility of constant-voltage phase-sectioning dimming and constant-current phase-sectioning dimming.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to a dimming method based on a phase-cut dimming control circuit of an LED lamp. Background technique [0002] At present, the LED lighting industry is developing rapidly, and the market's pursuit of energy-saving benefits has led to an increasing demand for LED dimming. One of the commonly used dimming methods of phase-cut dimming, this method is to change the sinusoidal waveform by adjusting the conduction angle of each half-wave of the alternating current, thereby changing the effective value of the alternating current, so as to achieve the purpose of dimming, and also This is called "chopper" dimming. At present, the phase-cut dimming LED drivers on the market are mainly aimed at LED products driven by constant current mode, but there are also some LED products that require constant voltage mode drive, such as LED light strips, and there is no one in the existing technology that can...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that there is no phase-cut dimming circuit suitable for driving constant voltage and constant current LED products in the prior art, the present invention provides a dimming method based on a phase-cut dimming control circuit for LED lamps

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