CN201138889Y

CN201138889Y - Novel driving device for flat light source

Info

Publication number: CN201138889Y
Application number: CNU2007203114230U
Authority: CN
Inventors: 姜凤山
Original assignee: Irico Group Corp
Current assignee: Irico Group Corp
Priority date: 2007-12-26
Filing date: 2007-12-26
Publication date: 2008-10-22
Anticipated expiration: 2017-12-26

Abstract

The utility model relates to a plane light source drive device, in particular to a novel plane light source drive device. The place light source drive source is characterized by comprising a rectifier circuit, a power factor correction circuit, a comparator and a signal amplifying circuit; the rectifier circuit and the power factor correction circuit are connected in series; the output end of the power factor correction circuit is electrically connected with the drain electrode of a high-voltage MOS tube through a primary winding of a step-up transformer; the source electrode of the high-voltage MOS tube is grounded; the comparator and the signal amplifying circuit are connected in series; two input ends of the comparator are electrically connected respectively with the output end of an oscillating circuit and a reference level; the output end of the signal amplifying circuit is electrically connected with the grid electrode of the high-voltage MOS tube; and the secondary winding of the step-up transformer is used for outwardly transmitting the drive signals. Obviously, the plane light source drive device has a simple structure; and the drive voltage and frequency can be adjusted so as to adjust the brightness of the illuminating plane light source.

Description

The novel planar light source drive device

Technical field

The utility model relates to a kind of planar light source drive unit, especially novel planar light source drive device.

Background technology

In the last few years, the energy-saving light aspect had obtained significant progress, and the lighting device of various different principle emerges in an endless stream.Electronic energy-saving lamp is described as civilian third generation new light sources, Green Product with its high light efficiency, high colour developing, economize on electricity energy, the fashionable whole world of long-life excellent properties, represents the developing direction of 21st century lighting source.But energy-saving light does not in the market almost have the light source of flat illumination mainly based on spherical and cylindricality.Only a few can also be to change by peripheral units such as light guide plate as the illuminating lamp on plane, but not illuminating lamp itself luminous be the plane.

An illuminating lamp part in the market is to adopt domestic lighting voltage directly to power, without any voltage transformation.Second kind is low-voltage driving, is generally the 3-40V DC driven.The third is exactly a high drive, and driving voltage is more than 1000V usually, and drive waveforms is generally sine wave, square wave or impulse wave.

The utility model content

The purpose of this utility model provides a kind of novel planar light source drive device, can be used for driving the novel planar light source, and make this planar light source adjustable brightness.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of novel planar light source drive device, its special feature is, the rectification circuit and the circuit of power factor correction that comprise series connection successively, the output of this circuit of power factor correction is electrically connected the source ground of this high-voltage MOS pipe by the elementary winding of step-up transformer with the drain electrode of high-voltage MOS pipe; Chuan Lian comparator and signal amplification circuit successively, wherein two of comparator inputs are electrically connected with the output and the reference level of oscillating circuit respectively, and the output of signal amplification circuit is electrically connected with the grid of aforementioned high-voltage MOS pipe; The secondary winding of step-up transformer is for drive signal output.

Wherein rectification circuit is the bridge rectifier that is input as the 220V alternating current.

Clearly, the utility model is simple in structure, and can regulate driving voltage and frequency, reaches the purpose of adjusting the illumination plane light-source brightness.The alternating current 220V input through after the bridge rectifier, is carried out the PFC power factor correction by primary transformers again.Through after the power factor correction, boost by secondary transformer again.Comparator compares the oscillator signal and the reference signal of the oscillating circuit generation of input, produces comparative level, amplifies by signal amplification circuit again, drives high-voltage MOS pipe.The break-make duration and the frequency of high-voltage MOS pipe determine the frequency of the last output waveform of last secondary transformer and the size of voltage.

Description of drawings

Accompanying drawing 1 is a theory diagram of the present utility model;

Accompanying drawing 2 is metal-oxide-semiconductor control waveform figure of the present utility model;

Accompanying drawing 3 is circuit theory diagrams of the present utility model.

Embodiment

Come the utility model is done further detailed explanation below in conjunction with accompanying drawing:

As shown in Figure 1, the 220V alternating current input commonly used of at first will throwing light on by bridge rectifier and PFC circuit of power factor correction, changes into the good direct current of power factor with the 220V alternating current, and voltage is less than 400V; And comparator compares oscillator signal and the reference signal that the oscillating circuit of importing produces, and produces comparative level, amplifies by signal amplification circuit again, drives high-voltage MOS pipe.The output of last circuit of power factor correction passes through the primary coil of step-up transformer and leakage, the source series of high-voltage MOS pipe, can drive signal be exported by the secondary winding of step-up transformer after boosting by output transformer.

As shown in Figure 2, wherein the frequency of oscillation of oscillating circuit generation signal can be adjusted, thereby reaches the purpose of controlling and driving signal frequency, and can be in conjunction with the adjusting of comparator realization to drive signal voltage.

The output waveform of oscillating circuit is sinusoidal wave, and its circuit ceiling voltage is that (the big I of Va changes 0＜Va＜40V) according to actual conditions to Va.Wherein the sinusoidal wave frequency of oscillating circuit output is adjustable.Reference circuit produces reference level Vb, and wherein Vb satisfies condition-Va＜Vb＜Va.Wherein the level value of reference level is adjustable.The reference level that sine wave that oscillating circuit produces and reference circuit produce enters comparator and compares, and can produce square wave (width of square wave and frequency are by sine wave freuqency and the control of reference level value).This square wave is controlled the break-make of metal-oxide-semiconductor after amplifying by signal, thus controlling and driving voltage and frequency.

Claims

1, a kind of novel planar light source drive device is characterized in that:

The rectification circuit and the circuit of power factor correction that comprise series connection successively, the output of this circuit of power factor correction is electrically connected the source ground of this high-voltage MOS pipe by the elementary winding of step-up transformer with the drain electrode of high-voltage MOS pipe;

Chuan Lian comparator and signal amplification circuit successively, wherein two of comparator inputs are electrically connected with the output and the reference level of oscillating circuit respectively, and the output of signal amplification circuit is electrically connected with the grid of aforementioned high-voltage MOS pipe;

The secondary winding of step-up transformer is for drive signal output.

2, novel planar light source drive device as claimed in claim 1 is characterized in that: wherein rectification circuit is the bridge rectifier that is input as the 220V alternating current.