Initial voltage adaptive method for constant-voltage dimming power supply

Abstract

The invention provides an initial voltage adaptive method for a constant-voltage dimming power supply. The initial voltage adaptive method is characterized by comprising the steps of controlling the output voltage to be boosted slowly when the dimming power supply is started; monitoring the operating current of an LED through a current detection circuit connected with the to-be-driven LED in series; when the LED generates the operating current, processing the monitored operating current of the LED through a current processing circuit, wherein the operating voltage is the initial voltage of the LED, and under the initial voltage, the minimum LED dimming luminance is recorded and defined by external hardware or software; and the maximum LED dimming luminance of the dimming power supply is achieved at a rated constant voltage point of the constant-voltage dimming power supply. By adoption of the method, different types of LED lamp beads or modules can be adapted, so that the dimming power supply can realize changes from the minimum LED dimming to the maximum LED dimming directly, the adaptability of the power supply is greatly improved, and the dimming range of the LED is expanded; and therefore, the technical problems of decreased dimming range and matching failure with a driving power supply caused by the starting voltage differences of the LED lamp beads of the LED dimming power supply are solved.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to a method for self-adapting the initial voltage of a constant-voltage dimming power supply. Background technique [0002] The energy-saving effect of LED is remarkable. More and more users for decorative purposes use LED lamps to replace the previous halogen lamps. The power supply of halogen lamps is a constant voltage power supply. Different decoration needs. Because it is a constant voltage power supply, the luminous brightness of the lamp can only be adjusted by adjusting the voltage change to create different atmospheres. Due to the characteristics of the LED, the voltage is lower than the internal electric field voltage, the internal carriers cannot form a current, and the LED cannot emit light; therefore, as a constant voltage dimming product, the dimming will not be practical when the voltage is lower than the minimum forward turn-on voltage of the LED series. The dimming act...

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Problems solved by technology

[0003] In view of the above defects, the purpose of the present invention is how to solve the problem that due to the difference in the turn-on voltage of different LEDs, the initialization voltage of the constant voltage dimming power supply of each lamp is different and needs to be adjusted separately; how to solve the problem that a higher initial voltage will affect the LED The problem of large inrush current when lighting up

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