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LED drive device

A LED driving and driving signal technology, which is applied in lighting devices, lamp circuit layout, light sources, etc., can solve the problems of misconduction of power components, high cost, and large space occupation, so as to avoid misconduction, low cost, and small occupation space Effect

Inactive Publication Date: 2011-11-02
NINGBO YINZHOU SELF PHOTOELECTRON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the embodiments of the present invention is to provide an LED driving device to overcome the defects in the prior art that the EMI standard is high in cost, takes up a large space, and misconducting of power components occurs.

Method used

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] After repeated measurement, analysis and research, the inventor found that the figure 1 The drive shown is the cause of false conduction of the power components. In this circuit, since the signal provided by the CPU chip 12F629 to the constant current chip UCT4170 is a square wave, the constant current chip UCT4170 has been switching between working and sleeping states. In such a frequent switching state, the constant current chip UCT4170 output In the sawtooth wave, there will be high-frequency and low-voltage black harmonic signals, which sometimes also make the power components conduct. Among them, the waveform of the output signal of the constant current chip ...

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PUM

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Abstract

The invention discloses an LED drive device, comprising a control signal generation circuit, a constant current chip, a sine / cosine harmonic wave signal eliminating circuit and a power element, wherein the control signal generation circuit is used for generating control signals for controlling states of an LED; the constant current chip is used for generating power element drive signals according to the control signals; the sine / cosine harmonic wave signal eliminating circuit is used for eliminating sine / cosine harmonic wave signals in the power element drive signals and comprises a resistor and a capacitor, wherein one end of the resistor is connected to the output end of the constant current chip while the other end of the resistor is connected to the input end of the power element, and one end of the capacitor is connected to the input end of the power element while the other end of the capacitor is grounded; and the power element is used for driving the LED according to the power element drive signals in which sine / cosine harmonic waves are eliminated. According to the LED drive device disclosed by the invention, the EMI (Electro-Magnetic Interference) performance of the LED drive device is improved by using the sine / cosine harmonic wave signal eliminating circuit so that the LED drive device can meet the EMI standard. The sine / cosine harmonic wave signal eliminating circuit has the advantages of low cost and small occupying space; in addition, the false conduction of the power element is avoided by adopting the sine / cosine harmonic wave signal eliminating circuit.

Description

technical field [0001] The invention relates to the technical field of driving circuits, in particular to an LED driving device. Background technique [0002] Existing automotive LED driving devices generally include a control signal generating circuit, a constant current chip and a power element. The control signal generation circuit is used to generate a control signal for controlling the state of the LED; the constant current chip is used to generate a power element drive signal according to the control signal; the power element is used to drive the LED according to the power element drive signal . [0003] The circuit principle diagram of a kind of LED driving device in the prior art is as follows: figure 1 As shown, the control signal generation circuit is composed of CPU chip 12F629 and its peripheral circuits, the constant current chip uses UCT4170, and the power element uses field effect transistor AO3400A. In this circuit, the control signal generating circuit ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 虞锋
Owner NINGBO YINZHOU SELF PHOTOELECTRON TECH