A constant voltage led drive circuit

A LED drive and circuit technology, applied in the direction of electric light source, electrical components, electroluminescent light source, etc., can solve the problems of LED aging, shortened service life, forward current reduction, etc., achieve low cost, improve conduction speed, voltage stable effect

Active Publication Date: 2018-06-08
GUANGDONG WEIGUOZHE HI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnitude of the forward current of the LED will change with the ambient temperature. When the ambient temperature reaches a certain temperature, the allowable forward current of the LED will decrease sharply; In the application process, a driving circuit with reliable driving function is required

Method used

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  • A constant voltage led drive circuit

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Embodiment Construction

[0011] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0012] see figure 1 , in an embodiment of the present invention, a constant voltage LED drive circuit includes a diode D1, a diode D2, a capacitor C1, an inductor L1, a resistor R1, and a triode BG1. The emitter of the triode BG1 is respectively connected to the power supply VCC and the inductor L2. The triode BG1 The bases are respectively connected to the resistor R1 and the positive pole of the diode D2, the negative pole of the diode D2 is respectively connected to the negative pole of the diode D1, the capacitor C2 and the positive pole of the light-emitting diode LED, the positive pole of the diode D1 is respectively connected to the other end of the inductor L2 and the collector of the triode BG2, and the emitter of the triode BG2 is respectively connected to the capacit...

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PUM

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Abstract

The invention discloses a constant-voltage LED driving circuit, which includes a diode D1, a diode D2, a capacitor C1, an inductor L1, a resistor R1 and a triode BG1. The emitter of the triode BG1 is respectively connected to the power supply VCC and the inductor L2. Connect the resistor R1 and the positive pole of the diode D2, the negative pole of the diode D2 is respectively connected to the negative pole of the diode D1, the capacitor C2 and the positive pole of the light-emitting diode LED, the positive pole of the diode D1 is respectively connected to the other end of the inductor L2 and the collector of the triode BG2, and the emitter of the triode BG2 is respectively connected to the capacitor C3 and the resistor R3 and the base of the triode BG2 are connected to the inductor L1, and the other end of the inductor L1 is connected to the resistor R2 and the capacitor C1 respectively. The invention can automatically adjust the output voltage to stabilize the voltage at both ends of the LED, and adding capacitor C3 and resistor R3 can increase the conduction speed of the triode BG2 and improve the sensitivity of the circuit. The circuit structure is simple, the cost is low, the volume is small, and the scope of application wide.

Description

technical field [0001] The invention relates to an LED, in particular to a constant voltage LED driving circuit. Background technique [0002] In recent years, semiconductor light sources are gradually entering the lighting field as a new type of solid light source. According to the physical principle of solid-state luminescence, the luminous efficiency can be close to 100%, with low working voltage, low power consumption, short response time, high luminous efficiency, impact resistance, long service life, pure light color, stable and reliable performance and low cost, etc. advantage. With the continuous reduction of LED prices and the continuous improvement of luminous brightness, semiconductor light sources have shown broad application prospects in the field of lighting. The volt-ampere characteristics of LEDs are the same as those of ordinary diodes, and small fluctuations in forward voltage will cause sharp changes in forward current. The magnitude of the forward curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/00
Inventor 刘映秋
Owner GUANGDONG WEIGUOZHE HI TECH CO LTD
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