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LED working mode control apparatus

A technology of control device and working mode, applied in lighting device, electric lamp circuit arrangement, light source and other directions, can solve the problems of luminous brightness, power improvement limitation, low utilization rate, etc. cost effect

Inactive Publication Date: 2014-12-24
吴槐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are still two disadvantages in the current stage of AC LEDs. One is that nearly half of the LEDs only work in half a cycle of AC power, the utilization rate is low, and the luminous efficiency is not as high as that of DC LEDs; When it is higher than a certain value, it will start to turn on and emit light, and the brightness and power increase of the light will be limited.

Method used

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Experimental program
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Effect test

Embodiment 1

[0069] Such as figure 1 As shown: the connection relationship is as follows:

[0070] 1. The rectifier circuit is a bridge rectifier. The positive pole of the output terminal is connected to the input terminal of the current limiting device and the first resistor in each LED module and the negative pole of the Zener diode of each threshold circuit are connected to form point C; the negative pole of the output terminal of the rectifier circuit Vin- is connected to the final A group of output terminals of LED modules are connected.

[0071] 2. CL20 is a current limiting device. Its input end is connected to the positive pole of the rectification output end, and its output end is connected to the input end of the LED in the first LED module.

[0072] 3. Each LED module is composed of an LED, a first switch Q1 and a first resistor R1, wherein the first resistor R1 is connected to the base of the control terminal of the first switch Q1 and the collector of the input terminal of t...

Embodiment 2

[0079] This embodiment is suitable for AC 120V 3W LED lamps.

[0080] Such as figure 2 As shown: the connection relationship is as follows:

[0081] 1. The rectifier circuit is a bridge rectifier, the output positive pole is connected to the input terminal of the current limiting device and the first resistor in each LED module and the negative pole of the Zener diode of each threshold circuit are connected to form point C; each LED module is connected in series with the other 26 LEDs Continue to connect in series, the output negative pole Vin- of the rectifier circuit is connected to the negative pole of the last LED.

[0082] 2. CL20 is a current limiting device. Its input end is connected with the output positive pole of the rectification circuit, and its output end is connected with the input end of the LED in the first LED module.

[0083] 3. Each LED module is composed of an LED, a first switch Q1 and a first resistor R1, wherein the first resistor R1 is connected to...

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Abstract

The invention relates to an LED working mode control apparatus with advantages of high voltage-withstanding property and high luminous efficiency. The LED working mode control apparatus is composed of a rectifying circuit, an LED module group, an LED current-limiting apparatus, and a threshold circuit. To be specific, the rectifying circuit is used for rectifying an alternating-current power supply. The LED current-limiting apparatus connected between the rectifying circuit and the LED module group is used for limiting and stabilizing working currents of LEDs in the circuit. The threshold circuit connected between the rectifying circuit and the LED module group is used for determining voltages between the output terminal anode of the rectifying circuit and output terminals of LED modules controlled independently by the threshold circuit and controlling the on and off of the LEDs of the LED modules. The provided LED working mode control apparatus has various advantages of high voltage-withstanding property, high efficiency, and long service life and the like.

Description

technical field [0001] The invention relates to an LED working mode control device. Background technique [0002] As the fourth generation of lighting fixtures that are green, energy-saving, power-saving, and long-lived, LED light sources have sprung up, received wide attention, and are developing rapidly in full swing. The current LED light source is a semiconductor device with low voltage (VF=2→3.6V) and high current (IF=200→1500mA), and it must provide a suitable DC current to emit light normally. The technology of direct current (DC) driving LED light sources has become more and more mature. Since the power supply used in our daily lighting is high-voltage alternating current (AC 100-220V), it is necessary to use step-down technology to obtain lower voltages. The commonly used ones are Transformer or switching power supply steps down, then converts alternating current (AC) into direct current (DC), and then converts into a DC constant current source, in order to promote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCH05B45/48
Inventor 林耀
Owner 吴槐
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