Sound and light controlled LED (Light Emitting Diode) power supply with anti-interference capability

Abstract

The invention belongs to the field of driving power supplies of LED (Light Emitting Diode) illuminating lamps and discloses a sound and light controlled LED power supply with an anti-interference capability, wherein the sound and light controlled LED power supply is composed of a sound and light controlled switching circuit and a constant current source circuit. A zero wire and a live wire of thealternating current of a commercial power supply are respectively accessed to the N and L ends of the sound and light controlled switching circuit, the T end of the constant current source circuit isconnected with the output end T of a relay (K), and the N end of the constant current source circuit is connected with the zero wire of the commercial power supply; after an ultrasonic sensor (MIC) and a photoresistor (R6) in the sound and light controlled switching circuit receive sound waves and light information, the signals are amplified by a triode (Q), and then, the actuation of the relay (K) is controlled so as to supply power for the constant current source circuit; the normally closed end B of the relay (K) is connected with a fire fighting wire so as to be used for supplying power for the constant current source circuit after the commercial power supply is powered off; and a constant current control chip (MT7930) realizes constant current control of output by controlling a switching tube (MOS).

Description

technical field [0001] The invention relates to an LED power supply, in particular to an acousto-optic control LED power supply with anti-interference capability. Background technique [0002] The use of sound and light control switches can meet the temporary and short-term lighting of construction sites at night, thereby eliminating the energy waste of permanent lights. For the sound and light control switches realized by silicon controlled rectifiers, the inductive load will have a current flow during standby, and there is a problem that the inductive load cannot be turned off or still flickers after being turned off. A thyristor-based switch is no problem for an incandescent lamp with a power factor of 1. But for LED power supply, its power factor is less than 1, because the phase of voltage and current is different, it will cause the switch to lose control or damage the switch. [0003] And because there are many mechanical equipment on the construction site, the load ...

AI Technical Summary

Problems solved by technology

But for LED power supply, its power factor is less than 1, because the phase of voltage and current is different, it will cause the switch out of control or damage the switch.

[0003] And because there are many mechanical equipment on the construction site, the load variation range of the power supply line is large; at the same time, due to the frequent start and stop of the equipment on the construction site, there is great interference with the power supply of the LED lighting lamp, and the damage rate of the non-isolated LED power supply to the LED lighting lamp is very high.

Images