High-frequency dimming circuit, method, power supply device and light-emitting device

Abstract

The present application relates to a high-frequency dimming circuit, method, power supply device and lighting device, wherein, the linear amplification drive module is used to provide equal drive current for each of the lamp beads; the multi-stage conversion module is used to provide the linear amplification drive The drive module provides reference voltages with a preset number of levels, wherein the reference voltages of different levels are different; the trigger circuit is used to generate a pulse trigger signal with a first preset frequency; the main control circuit is used to control the data packet according to the obtained light source , the pulse-type trigger signal generates a pulse-type voltage signal of a second preset frequency, so as to control the multi-level conversion module to provide the linear amplification drive module with the reference voltage of the second preset frequency, so that the linear amplification drive module provides each The lamp bead provides a driving current with a second preset frequency. The high-frequency dimming technology provided by this application has the advantages of short current establishment time, large brightness adjustment range, high current adjustment accuracy, uniform luminous effect of lamp beads, and low power consumption.

Description

technical field [0001] The present invention relates to the technical field of electronic circuits, in particular to a high-frequency dimming circuit, a method, a power supply device and a light-emitting device. Background technique [0002] Most of the light sources used in traditional visual scenes use constant voltage to drive the lamp beads, and adjust the brightness of the lamp beads by controlling and changing the voltage across the lamp beads. If the constant voltage driving method is used to control multiple lamp beads at the same time, due to factors such as poor consistency of multiple lamp beads, greater influence by temperature, and large changes in volt-ampere characteristics affected by the environment, the voltage of each lamp bead will be inconsistent and the internal resistance will change. In large and other situations, the brightness of the lamp beads in the row or column is directly inconsistent, and the expected brightness effect cannot be achieved. [...

AI Technical Summary

Problems solved by technology

If the constant voltage driving method is used to control multiple lamp beads at the same time, due to factors such as poor consistency of multiple lamp beads, greater influence by temperature, and large changes in volt-ampere characteristics due to environmental influences, the voltage of each lamp bead will be inconsistent and the internal resistance will change. Large and other situations will directly lead to the inconsistency of the light and dark of the lamp beads in the row or column, and the expected brightness effect cannot be achieved.

[0003] Moreover, the range from the turn-on voltage of ordinary white light beads to the maximum working voltage is 2V-3.5V, and the voltage adjustable range is narrow, which cannot meet the accuracy requirements of light source brightness adjustment, resulting in the traditional constant voltage multi-lamp bead light source. The application scenarios are limited, and it is difficult to apply to high-speed scenarios

And when this kind of light source needs to be fully bright or flickering as a whole, the lamp bead takes a long time to establish light and is seriously disturbed; it has the disadvantages of high power consumption, obvious temperature rise, large voltage fluctuation and short life.

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