CN105611687A - LED circuit - Google Patents
LED circuit Download PDFInfo
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- CN105611687A CN105611687A CN201510821544.9A CN201510821544A CN105611687A CN 105611687 A CN105611687 A CN 105611687A CN 201510821544 A CN201510821544 A CN 201510821544A CN 105611687 A CN105611687 A CN 105611687A
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Abstract
The invention discloses an LED circuit, and relates to the field of electronic circuits. The LED circuit comprises a power circuit unit, a driving circuit unit, an LED light emitting circuit unit and a filter circuit unit, wherein the power circuit unit, the driving circuit unit and the LED light emitting circuit unit are connected in series, and the filter circuit unit is connected with the LED light emitting circuit unit in parallel. The LED light emitting circuit unit is composed of an LED serial connection branch or at least two LED serial connection branches in parallel connection, and the LED serial connection branch is formed connecting LEDs in series or connecting the LED and a current-limiting resistor in series. According to the invention, a constant current switching power supply used for driving is replaced in the LED product, especially the LED illumination product, the technical limitation of using the constant current switching power supply for driving in the LED application circuit technology is removed, and the LED circuit also has the advantages of being simple in structure, low in cost, high in reliability and stability, convenient to realize centralized control and the like.
Description
Technical field
The present invention relates to electronic circuit field, be specifically related to a kind of LED circuit.
Background technology
LED because it has that brightness is high, operating voltage is low, power consumption is little, the advantage such as long, the shock-resistant and stable performance of miniaturization, life-span, be used widely in fields such as finance, traffic, physical culture, advertisements. The drive circuit of LED generally all adopts constant-current switch power source, to ensure that LED does not shorten and damages because current overload causes the LED life-span, but, due to the circuit more complicated of constant-current switch power source, constant current IC circuit is had relatively high expectations to working environment, and is operated in high-frequency impulse state, and its stability and reliability are all unlike LED element itself, therefore, the long-life advantage of LED is had a greatly reduced quality in this link of constant-current switch power source. And the circuit design that at present solves this problem by capacitance-resistance voltage reduction circuit exists, security is low, the drawback of poor stability, and in the time that the power supply of LED occurs extremely to open circuit, whole LED system is by cisco unity malfunction, self temperature of LED can raise along with the growth of fluorescent lifetime, in the time arriving certain high temperature, can there is explosion and even burn out whole LED circuit in LED, cause the economic loss that can not save. The present invention has introduced a kind of LED circuit; it is by special structural design; make LED circuit have simple in structure, with low cost, stability is high, be convenient to realize the advantages such as centralized Control; can especially in LED illuminating product, replace constant-current switch power source at LED product drives; obtain the energy conversion efficiency higher than constant-current switch power source drive circuit; and circuit can be automatically by dump in the time of LED excess Temperature, the object that reach effective protection LED, extends LED Comprehensive service life.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of LED circuit.
For realizing object of the present invention, technical scheme of the present invention is as follows.
A kind of LED circuit, comprise power circuit unit, drive circuit unit and LED illuminating circuit unit and the filter circuit unit in parallel with LED illuminating circuit unit of series connection successively, described LED illuminating circuit unit is made up of a LED series arm or at least two LED series arms in parallel, and described LED series arm is connected by LED or is composed in series by LED and current-limiting resistance.
Preferably, described power circuit unit comprises the energy storage chip that transformer that input is connected with mains supply, bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, described energy storage chip is the power supply of LED illuminating circuit unit, is drive circuit unit power supply by the second output by the first output, the earth terminal ground connection of described energy storage chip.
Preferably, described drive circuit unit comprises control chip and the reduction voltage circuit being mainly made up of diode, electric capacity, inductance, the first control end of described control chip and connect the positive pole of diode after be connected with one end of electric capacity, the negative pole of described diode and connect one end of inductance after be connected with the first output of energy storage chip.
Preferably, described filter circuit unit is connected and is formed by an electric capacity or at least two electric capacity.
Preferably, the negative pole end of described LED illuminating circuit unit and publicly between be in series with control circuit unit, the bridge circuit that described control circuit unit comprises the first ON-OFF control circuit and is made up of resistance and thermistor.
Preferably, single or continuous at least two LED two ends of described LED series arm are in parallel with the combinational circuit of Zener diode or Zener diode, the positive terminal of the combinational circuit of described Zener diode or Zener diode connects LED negative pole end, and negative pole end connects LED positive terminal.
Preferably, described power circuit unit is parallel with stand-by power supply circuit unit, and described stand-by power supply circuit unit comprises rechargeable battery, resistance, NPN type triode and diode.
Preferably, the bridge circuit that described stand-by power supply circuit unit is in series with second switch control circuit and is made up of resistance and thermistor.
Beneficial effect is: the present invention is a kind of LED circuit, its power circuit unit, drive circuit unit and LED illuminating circuit unit taking series connection and the filter circuit unit in parallel with LED illuminating circuit unit are as its main member, especially in LED illuminating product, replacing constant-current switch power source at LED product drives, make LED application circuit technology break the technical monopoly that constant-current switch power source drives, and have simple in structure, with low cost, good reliability, stability high, be convenient to realize the advantages such as centralized Control. electric capacity in filter circuit unit not only can filter out power circuit unit in the output of energy storage chip high-frequency noise, cut off the path that high-frequency noise is propagated by current supply circuit, and prevent that noise that power supply carries forms circuit and disturb, improve energy storage chip and export to the Current rise of LED illuminating circuit and the waveform of decline, make waveform become mild, reach the object that plateau current is provided to LED illuminating circuit, in like manner, electric capacity in drive circuit unit makes control chip have stable power supply input, has reduced the impact that power supply increases sharply on chip. and LED series arm single or continuously at least two LED two ends and the combinational circuit parallel connection of Zener diode or Zener diode have effectively solved the connect technical barrier of " dead lamp stops " of LED, and in the time that the temperature of LED in LED illuminating circuit is elevated to certain value, thermistor in bridge circuit senses after the temperature signal of LED in LED illuminating circuit to signal of the first ON-OFF control circuit, first ON-OFF control circuit control the first on-off circuit disconnects, block the power supply of LED illuminating circuit is supplied with, then make LED illuminating circuit disconnect, thereby further protect the each LED lamp in LED illuminating circuit, thereby extend the service life of LED. in addition, when power circuit is normally worked, not only give LED illuminating circuit and drive circuitry, returning stand-by power supply circuit charges, in stand-by power supply circuit, include two NPN type triodes, in the time that the electric current of power circuit and rechargeable battery is identical, a NPN type triode cut-off, the conducting of a NPN type triode, diode is lighted, illustrate that rechargeable battery has been full of electricity, in the time that power circuit disconnects because of abnormal conditions, stand-by power supply circuit is powered to LED illuminating circuit, thereby circuit is normally worked, but, when the excess Temperature of LED, after main power source is cut off, the second switch control circuit of connecting with stand-by power supply circuit unit disconnects second switch control circuit under the signal of bridge circuit, stand-by power supply circuit cannot be powered to overheated LED, ensure the service life of LED.
Brief description of the drawings
Fig. 1 is the basic electric theory diagram of a kind of LED circuit of the present invention.
Fig. 2 is the technical scheme circuit theory diagrams that a kind of LED circuit of the present invention is composed in parallel by three LED series arms.
Fig. 3 is the technical scheme circuit theory diagrams that a kind of LED circuit of the present invention increases stand-by power supply circuit unit and stand-by power supply circuit unit overheating protection circuit.
Detailed description of the invention
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with detailed description of the invention, further set forth the present invention.
Embodiment 1
As shown in Figure 1, a kind of LED circuit, comprise power circuit unit, drive circuit unit and LED illuminating circuit unit and the filter circuit unit in parallel with LED illuminating circuit unit of series connection successively, described LED illuminating circuit unit is made up of a LED series arm, and described LED series arm is connected by LED or is composed in series by LED and current-limiting resistance.
Wherein, described power circuit unit comprises the energy storage chip that transformer that input is connected with mains supply, bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, described energy storage chip is the power supply of LED illuminating circuit unit, is drive circuit unit power supply by the second output by the first output, the earth terminal ground connection of described energy storage chip.
Wherein, described drive circuit unit comprises control chip and the reduction voltage circuit being mainly made up of diode, electric capacity, inductance, the first control end of described control chip and connect the positive pole of diode after be connected with one end of electric capacity, the negative pole of described diode and connect one end of inductance after be connected with the first output of energy storage chip.
Wherein, described filter circuit unit is connected and is formed by an electric capacity or at least two electric capacity.
Wherein, the negative pole end of described LED illuminating circuit unit and publicly between be in series with control circuit unit, the bridge circuit that described control circuit unit comprises the first ON-OFF control circuit and is made up of resistance and thermistor.
When circuit working, power circuit unit is converted to the required power supply of LED mains supply, by conversion after electrical power storage in energy storage chip, export to respectively LED illuminating circuit unit and drive circuit unit by energy storage chip, electric capacity in the filter circuit unit in parallel with LED illuminating circuit unit not only can filter out power circuit unit in the high-frequency noise of energy storage chip output, cut off the path that high-frequency noise is propagated by current supply circuit, and prevent that the noise that power supply carries forms and disturbs circuit, improve energy storage chip and export to the Current rise of LED illuminating circuit and the waveform of decline, make waveform become mild, reach the object that plateau current is provided to LED illuminating circuit, in like manner, electric capacity in drive circuit unit makes control chip have stable power supply input, reduce the impact that power supply increases sharply on chip. in the time that the temperature of LED in LED illuminating circuit is elevated to certain value, thermistor in bridge circuit senses after the temperature signal of LED in LED illuminating circuit to signal of the first ON-OFF control circuit, first ON-OFF control circuit control the first on-off circuit disconnects, block the power supply of LED illuminating circuit is supplied with, then make LED illuminating circuit disconnect, thereby further protect the each LED lamp in LED illuminating circuit, thereby extended the service life of LED.
Embodiment 2
Fig. 2 is the technical scheme circuit theory diagrams that LED circuit of the present invention is composed in parallel by three LED series arms. The present embodiment is not provided with filter circuit unit, is applicable to replace the general lighting occasion without constant luminance such as incandescent lamp and power saving fluorescent lamp.
The present embodiment difference from Example 1 is, only increase by two LED series arms, and correspondingly changed the parameter of electric capacity, resistance, inductance, the also corresponding increase of the power of whole circuit according to total operating current variation, its complementary characteristic is all similar with embodiment 1, no longer repeats at this.
Embodiment 3
Fig. 3 is the technical scheme circuit theory diagrams that LED circuit of the present invention increases stand-by power supply circuit unit and stand-by power supply circuit unit overheating protection circuit.
The present embodiment difference from Example 1 is, stand-by power supply circuit unit and stand-by power supply circuit unit overheating protection circuit are only increased, when power circuit is normally worked, not only give LED illuminating circuit and drive circuitry, returning stand-by power supply circuit charges, in the time that power circuit disconnects because of abnormal conditions, stand-by power supply circuit is powered to LED illuminating circuit, thereby circuit is normally worked, but in the time of the excess Temperature of LED, after main power source is cut off, the second switch control circuit of connecting with stand-by power supply circuit unit disconnects second switch control circuit under the signal of bridge circuit, stand-by power supply circuit cannot be powered to overheated LED, ensure the service life of LED.
Claims (8)
1. a LED circuit, it is characterized in that, comprise power circuit unit, drive circuit unit and LED illuminating circuit unit and the filter circuit unit in parallel with LED illuminating circuit unit of series connection successively, described LED illuminating circuit unit is made up of a LED series arm or at least two LED series arms in parallel, and described LED series arm is connected by LED or is composed in series by LED and current-limiting resistance.
2. a kind of LED circuit according to claim 1, it is characterized in that, described power circuit unit comprises the energy storage chip that transformer that input is connected with mains supply, bridge rectifier that input is connected with transformer output and input are connected with bridge rectifier output, described energy storage chip is the power supply of LED illuminating circuit unit, is drive circuit unit power supply by the second output by the first output, the earth terminal ground connection of described energy storage chip.
3. a kind of LED circuit according to claim 2, it is characterized in that, described drive circuit unit comprises control chip and the reduction voltage circuit being mainly made up of diode, electric capacity, inductance, the first control end of described control chip and connect the positive pole of diode after be connected with one end of electric capacity, the negative pole of described diode and connect one end of inductance after be connected with the first output of energy storage chip.
4. a kind of LED circuit according to claim 1, is characterized in that, described filter circuit unit is connected and formed by an electric capacity or at least two electric capacity.
5. a kind of LED circuit according to claim 1, it is characterized in that, the negative pole end of described LED illuminating circuit unit and publicly between be in series with control circuit unit, the bridge circuit that described control circuit unit comprises the first ON-OFF control circuit and is made up of resistance and thermistor.
6. a kind of LED circuit according to claim 1, it is characterized in that, single or continuous at least two LED two ends of described LED series arm are in parallel with the combinational circuit of Zener diode or Zener diode, the positive terminal of the combinational circuit of described Zener diode or Zener diode connects LED negative pole end, and negative pole end connects LED positive terminal.
7. a kind of LED circuit according to claim 1, is characterized in that, described power circuit unit is parallel with stand-by power supply circuit unit, and described stand-by power supply circuit unit comprises rechargeable battery, resistance, NPN type triode and diode.
8. a kind of LED circuit according to claim 7, is characterized in that, the bridge circuit that described stand-by power supply circuit unit is in series with second switch control circuit and is made up of resistance and thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821544.9A CN105611687A (en) | 2015-11-24 | 2015-11-24 | LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821544.9A CN105611687A (en) | 2015-11-24 | 2015-11-24 | LED circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105611687A true CN105611687A (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510821544.9A Pending CN105611687A (en) | 2015-11-24 | 2015-11-24 | LED circuit |
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| Country | Link |
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| CN (1) | CN105611687A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201331030Y (en) * | 2009-02-11 | 2009-10-21 | 东莞市龙立祥照明科技有限公司 | LED circuit |
| US8710745B1 (en) * | 2012-12-11 | 2014-04-29 | Unity Opto Technology Co., Ltd. | LED drive circuit |
| CN203840611U (en) * | 2014-05-05 | 2014-09-17 | 长治市华杰光电科技有限公司 | LED circuit having overheating protection function |
-
2015
- 2015-11-24 CN CN201510821544.9A patent/CN105611687A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201331030Y (en) * | 2009-02-11 | 2009-10-21 | 东莞市龙立祥照明科技有限公司 | LED circuit |
| US8710745B1 (en) * | 2012-12-11 | 2014-04-29 | Unity Opto Technology Co., Ltd. | LED drive circuit |
| CN203840611U (en) * | 2014-05-05 | 2014-09-17 | 长治市华杰光电科技有限公司 | LED circuit having overheating protection function |
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Application publication date: 20160525 |
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