A slow start circuit and LED power supply device

Abstract

The embodiment of the invention discloses a slow start circuit and an LED power supply device. The LED power supply device is connected to an LED light string, and the LED power supply device includes a power input circuit, a power control circuit and a slow start circuit; the power input circuit rectifies and filters the mains power Then output the first power supply voltage and the second power supply voltage; the slow start circuit performs internal power supply after stabilizing the first power supply voltage, and outputs a pulse width modulation signal to the power supply control circuit after delaying the preset time when detecting that there is power inside; The power control circuit converts the second power supply voltage into a power supply voltage to supply power to the LED light string according to the pulse width modulation signal, and controls the LED light string to become brighter gradually. The power supply to the LED light string is delayed through the slow start circuit to limit the inrush current when the power is just turned on; the LED light string gradually becomes brighter, so that the eyes can gradually adapt, and the lighting effect is more gentle. Therefore, the problem that the existing LED power supply module cannot be started slowly and lighted at regular intervals is solved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a slow start circuit and an LED power supply device. Background technique [0002] There are three common existing LED power module solutions, the first one is AC to DC circuit (AC-DC, using constant voltage chip) plus single-chip microcomputer or DC to DC circuit (DC-DC, using constant current dimming chip) , the second is AC to DC (AC-DC, using a constant current chip) plus a flicker-removing chip and a switching dimming circuit, and the third is AC to DC (AC-DC, using a constant current chip) plus It should be placed in the conversion dimming circuit, and the single chip microcomputer should be used in the conversion and dimming circuit to control it. [0003] However, these methods are to directly light up the LED lights after power-on, and then adjust the light; the LED lights cannot be turned on after a period of delay, which will cause all lights to be turned on direc...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned technical problems, the embodiment of the present invention provides a slow start circuit and LED power supply device to solve the problem that the existing LED power supply module cannot start slowly and light up the LED light at regular intervals

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