CN203467025U

CN203467025U - High-efficiency and energy-saving LED illumination power supply circuit

Info

Publication number: CN203467025U
Application number: CN201320509569.1U
Authority: CN
Inventors: 程森林; 万东; 李星奎; 马鹏
Original assignee: CHONGQING EAST LING LIGHTING EQUIPMENT Co Ltd
Current assignee: CHONGQING EAST LING LIGHTING EQUIPMENT Co Ltd
Priority date: 2013-08-20
Filing date: 2013-08-20
Publication date: 2014-03-05
Anticipated expiration: 2023-08-20

Abstract

The utility model provides a high-efficiency and energy-saving LED illumination power supply circuit. The circuit comprises a rectifier bridge and a filter circuit. An input terminal of the rectifier bridge is connected with commercial power. An output terminal of the rectifier bridge is connected with the filter circuit. The commercial power is rectified into a direct current through the rectifier bridge, then is filtered through the filter circuit and then is output. An output terminal of the filter circuit is connected with an anode of a LED array. A frequency modulation power supply circuit is also included. A first input terminal of the frequency modulation power supply circuit is connected with the output terminal of the filter circuit. An output terminal of the frequency modulation power supply circuit is connected with an input terminal of a frequency adjustment circuit. An output terminal of the frequency adjustment circuit is connected with a base electrode of a switch triode. An emitting electrode of the switch triode is connected with a second input terminal of the frequency modulation power supply circuit. A collector electrode of the switch triode is connected with a first terminal of an energy storage inductor. A second terminal of the energy storage inductor is connected with a cathode of the LED array. By using the circuit of the utility model, the circuit structure can be simplified and the service life of the LED is prolonged. When a switch tube is cut off, energy stored in the inductor can flow back to and lighten the LED so that energy utilization efficiency is increased.

Description

A kind of energy-efficient LED lighting source circuit

Technical field

The utility model relates to power circuit, is specifically related to a kind of energy-efficient LED lighting source circuit.

Background technology

LED, with the advantage such as its energy-conserving and environment-protective, life-span are long, pollution-free, has obtained the attention of every country.At present, LED has been widely used in a plurality of fields such as Landscape Lighting, large scale display, automotive electronics.In the evolution of LED lighting technology, the research of LED power circuit is important topic always, in the patent application that is CN102378433A at publication number, disclosed a kind of power circuit, this power circuit is, by potential device, voltage is processed to place in circuit afterwards, sort circuit complex structure, simultaneously when LED light emitting array increases or reduce, need to regulate to control by potential device or DC-DC amplitude the size of electric current, but the energy utilization rate of potential device is not high, is unfavorable for energy savings.

Utility model content

In order to overcome the defect existing in above-mentioned prior art, the purpose of this utility model is to provide a kind of energy-efficient LED lighting source circuit, and the utility model can simplify circuit structure, extend LED useful life, energy efficient.

In order to realize above-mentioned purpose of the present utility model, the utility model provides a kind of energy-efficient LED lighting source circuit, comprise rectifier bridge and the filter circuit being connected with described rectifier bridge, the input of described rectifier bridge is connected with civil power, the output of described rectifier bridge is connected with filter circuit, described civil power is that direct current is exported after by filter circuit filtering through rectifier bridge rectification, and the output of described filter circuit is connected with the anode of LED array; Frequency modulation power supply circuits, the first input end of described frequency modulation power supply circuits is connected with filter circuit output, the output of described frequency modulation power supply circuits is connected with the input of frequency adjustment circuit, be used to frequency adjustment circuit power supply, described frequency adjustment circuit is for the transformable voltage signal of output frequency; The output of described frequency adjustment circuit is connected with the base stage of switch triode, the emitter of described switch triode is connected with the second input of described frequency modulation power supply circuits, the collector electrode of described switch triode is connected with the first end of energy storage inductor, and the second end of described energy storage inductor is connected with the negative electrode of LED array.

In a kind of preferred implementation of the present utility model, the voltage signal of described frequency adjustment circuit output is square-wave signal.

In another kind of preferred implementation of the present utility model, between the output of described frequency adjustment circuit and the base stage of switch triode, be connected with the first resistance.

In another preferred implementation of the present utility model, between the first end of described energy storage inductor and the anode of LED array, be connected with fly-wheel diode, the anode of described fly-wheel diode is connected with the first end of energy storage inductor, and the negative electrode of described fly-wheel diode is connected with the anode of LED array.

Useful technique effect of the present utility model is:

1. prime of the present utility model is directly processed commercial power rectification filtering rear place in circuit by rectifier bridge and filter circuit, without potential device, without voltage magnitude is regulated, has simplified circuit construction of electric power.

2. the square-wave signal control switch pipe break-make that the utility model produces by frequency adjustment circuit, and by the frequency that frequency adjustment circuit changes square-wave signal, regulate the size of current of the LED lamp of flowing through, guarantee LED normal operation, extend LED useful life, save energy consumption.

3. the utility model utilizes inductance to suppress the character of current break in loop, coordinate the ON time of switching tube guarantee the to flow through electric current of LED can not surpass the maximum operating currenbt of LED, and the energy that inductance stores when switching tube ends can reflux and light LED, improve efficiency of energy utilization, reach energy-efficient object.

Additional aspect of the present utility model and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present utility model and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:

Fig. 1 is the structure chart of the energy-efficient LED lighting source circuit of the utility model;

Fig. 2 is the voltage waveform of the utility model the first preferred implementation medium frequency regulating circuit output and the current waveform figure of the LED array of flowing through;

Fig. 3 is the voltage waveform of the utility model the second preferred implementation medium frequency regulating circuit output and the current waveform figure of the LED array of flowing through;

Fig. 4 is the voltage waveform of the utility model the 3rd preferred implementation medium frequency regulating circuit output and the current waveform figure of the LED array of flowing through.

Embodiment

Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.

In description of the present utility model, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.

The utility model provides a kind of energy-efficient LED lighting source circuit, this circuit comprises a rectifier bridge and filter circuit, frequency modulation power supply circuits, frequency adjustment circuit, energy storage inductor, diode, switch triode and emitting led array, as shown in Figure 1, the input of rectifier bridge is connected with civil power, the output of rectifier bridge is connected with filter circuit, civil power is that direct current is exported after by filter circuit filtering through rectifier bridge rectification, need not potential device, can simplify circuit structure.

The output of filter circuit is connected with the first input end of frequency modulation power supply circuits with the anode of LED array respectively, the output of frequency modulation power supply circuits is connected with the input of frequency adjustment circuit, frequency modulation power supply circuits are used to frequency adjustment circuit power supply, frequency adjustment circuit is for the transformable voltage signal of output frequency, the output of frequency adjustment circuit is connected with the base stage of switch triode Q1, the emitter of described switch triode Q1 is connected with the second input of described frequency modulation power supply circuits, the collector electrode of described switch triode Q1 is connected with the first end of energy storage inductor L1, the second end of described energy storage inductor L1 is connected with the negative electrode of LED array.

In the present embodiment, the voltage signal of frequency adjustment circuit output is square-wave signal, and frequency adjustment circuit generates square wave, simultaneously can also regulation output rectangle wave frequency.

In the present embodiment, frequency adjustment circuit can be existing optional frequency regulating circuit, is connected with the first resistance R 1 between the output of frequency adjustment circuit and the base stage of switch triode, plays the effect of current limliting.

In the present embodiment, between the first end of energy storage inductor and the anode of LED array, be connected with sustained diode 1, the anode of described sustained diode 1 is connected with the first end of energy storage inductor L1, and the negative electrode of described sustained diode 1 is connected with the anode of LED array.

Civil power 220V is converted into direct current by filter circuit after rectifier bridge rectification, is emitting led array and the power supply of frequency modulation power supply circuits, and circuit medium frequency regulating circuit produces conducting and the cut-off that square wave carrys out control switch triode.

When the operating frequency of frequency modulation power supply circuits is lower, as shown in Figure 2 (a) shows, in switch triode conducting, whole power circuit conducting, now due to the existence of energy storage inductor in circuit, the sudden change that suppresses electric current makes electric current rising to the maximum operating currenbt of light-emitting diode need of work, switching tube cut-off afterwards, the energy storing in inductance refluxes through fly-wheel diode, flow through the current waveform of LED array as shown in Fig. 2 (b), because operating frequency is too low, can not guarantee that LED is continued to light.

Increase along with FM circuit operating frequency, as shown in Fig. 3 (a), the time of switching tube cut-off shortens, the energy now storing in inductance can guarantee the state of whole circuit in continuous conducting, as shown in Figure 3 (b), but because the glow current of light-emitting diode requires on certain value, now emitting led array still can not continue conducting.

Continue to increase the operating frequency of FM circuit, as shown in Figure 4 (a), in the time of switching tube conducting, whole power circuit conducting, now due to the existence of energy storage inductor, flow through the electric current rising of emitting led array to the maximum current that makes light-emitting diode normal operation, now switching tube cut-off, whole power circuit disconnects, the energy storing in inductance is normally lighted through the emitting led array of fly-wheel diode backflow assurance, the electric current of emitting led array of now flowing through slowly reduces, when reducing to the minimum current of emitting led normal operation, switching tube is conducting again, whole circuit loop conducting, the sudden change that inductance suppresses electric current make its again rising to LED array maximum operating currenbt, inductance storage power.When reaching LED array maximum operating currenbt, triode cut-off repeats the last cycle, due to LED normally luminous required electric current be not a steady state value, so this circuit can guarantee that LED is normally lighted, the current waveform of the LED array of flowing through is as shown in Figure 4 (b).

Continue to increase frequency adjustment circuit and produce rectangle wave frequency, the current fluctuation scope of the emitting led array that can make to flow through further reduces, and makes emitting led array normal operation.

Circuit of the present utility model is after the filtering of commercial power rectification, directly to access LED array circuit, when LED light emitting array increases or reduce, only needing the lasting time of high level in FM circuit that changes is the maximum of the electric current of the adjustable LED of flowing through, and need not regulate to control by potential device or DC-DC amplitude the size of electric current, improved efficiency of energy utilization.The adjusting that the utility model is realized size of current is that the operating frequency of the square wave that produces by regulating frequency regulating circuit realizes, but not regulates realization by PWM.The energy that this circuit stores in inductance in switching tube cut-off refluxes through fly-wheel diode, by the size of storage power in the frequency adjustment inductance of change frequency modulation operating circuit, guarantee to regulate when LED is lit the size of the electric current of the LED that flows through, extend the useful life of LED, and reach energy-conservation effect.

In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.

Although illustrated and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present utility model and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is limited by claim and equivalent thereof.

Claims

1. an energy-efficient LED lighting source circuit, is characterized in that, comprising:

Rectifier bridge and the filter circuit being connected with described rectifier bridge, the input of described rectifier bridge is connected with civil power, the output of described rectifier bridge is connected with filter circuit, described civil power is that direct current is exported after by filter circuit filtering through rectifier bridge rectification, and the output of described filter circuit is connected with the anode of LED array;

Frequency modulation power supply circuits, the first input end of described frequency modulation power supply circuits is connected with filter circuit output, the output of described frequency modulation power supply circuits is connected with the input of frequency adjustment circuit, is used to frequency adjustment circuit power supply, the transformable voltage signal of described frequency adjustment circuit output frequency;

The output of described frequency adjustment circuit is connected with the base stage of switch triode, the emitter of described switch triode is connected with the second input of described frequency modulation power supply circuits, the collector electrode of described switch triode is connected with the first end of energy storage inductor, and the second end of described energy storage inductor is connected with the negative electrode of LED array.

2. energy-efficient LED lighting source circuit as claimed in claim 1, is characterized in that: the voltage signal of described frequency adjustment circuit output is square-wave signal.

3. energy-efficient LED lighting source circuit as claimed in claim 1, is characterized in that: between the output of described frequency adjustment circuit and the base stage of switch triode, be connected with the first resistance.

4. energy-efficient LED lighting source circuit as claimed in claim 1, it is characterized in that: between the first end of described energy storage inductor and the anode of LED array, be connected with fly-wheel diode, the anode of described fly-wheel diode is connected with the first end of energy storage inductor, and the negative electrode of described fly-wheel diode is connected with the anode of LED array.