Dimming circuit and method of LED (Light Emitting Diode) lighting lamp

A technology for LED lighting and dimming circuits, which is applied in the layout of electric lamp circuits, lighting devices, light sources, etc., can solve the problems of many remote controllers, high cost, and time requirements for switching actions, and achieves the effect of strong anti-interference ability.
CN103298221AActive Publication Date: 2013-09-11GOLDP ELECTRICAL APPLIANCES
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
GOLDP ELECTRICAL APPLIANCES
Publication Date
2013-09-11

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Abstract

A dimming circuit of an LED (Light Emitting Diode) lighting lamp is formed by a switch and brightness control signal given unit, a brightness control signal conversion unit and a brightness adjustment driving unit. According to a dimming method of the LED lighting lamp, a method that positive and negative half waves of an alternating current power supply are controlled to be passed through or not is utilized and a single fire-wire mode is utilized to give a brightness control signal of the LED lighting lamp; the brightness control signal controls a digital potentiometer to output PWM (Pulse Width Modulation) duty ratio modulation voltage; a PWM brightness control signal is generated after the PWM duty ratio modulation voltage is in comparison with a triangular wave signal; and the duty ratio adjustable PWM brightness control signal controls the brightness change of the LED lighting lamp through the brightness adjustment driving unit. The dimming circuit of the LED lighting lamp can achieve replacement and upgrade of the ordinary lighting lamp without remote control, control line or power line re-laying.
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Description

technical field

[0001] The invention relates to a lighting lamp technology, in particular to a multi-level dimming circuit and method for an LED lighting lamp. Background technique

[0002] Due to the non-linear characteristics of the LED lighting lamp, the brightness of the LED lighting lamp cannot be realized by adjusting the voltage.

[0003] When a controllable constant current source is used to adjust the brightness of the LED lighting, the change of the working current will cause the color shift of the LED lighting. At the same time, the load current of the LED lighting at low brightness will also become very low, which will make the The efficiency of the constant current source decreases and the temperature rise increases, and the power consumption on the driver chip increases, which will damage the life of the constant current source and the LED light source.

[0004] Using PWM (pulse width modulation) dimming method to control the brightness of LED lighting can avo...

Claims

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