CN203181275U - LED drive circuit - Google Patents

LED drive circuit Download PDF

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Publication number
CN203181275U
CN203181275U CN 201220746019 CN201220746019U CN203181275U CN 203181275 U CN203181275 U CN 203181275U CN 201220746019 CN201220746019 CN 201220746019 CN 201220746019 U CN201220746019 U CN 201220746019U CN 203181275 U CN203181275 U CN 203181275U
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CN
China
Prior art keywords
described
circuit
current
led drive
light source
Prior art date
Application number
CN 201220746019
Other languages
Chinese (zh)
Inventor
陈榕锦
Original Assignee
陈榕锦
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 陈榕锦 filed Critical 陈榕锦
Priority to CN 201220746019 priority Critical patent/CN203181275U/en
Application granted granted Critical
Publication of CN203181275U publication Critical patent/CN203181275U/en

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Abstract

The utility model discloses an LED drive circuit. The LED drive circuit comprises an input protective circuit, a step-down circuit, a rectifier and filter circuit and an LED light source circuit, which are electrically connected to each other, and also comprises at least a voltage-divider current-limiting resistor which is connected in series with the LED light source circuit. The LED drive circuit is externally connected with alternating current. High voltage AC undergoes voltage reduction by the step-down circuit and then undergoes rectification by a rectifier diode and filtering by a filter capacitor in the rectifier and filter circuit, and smooth direct voltage is finally outputted. Current-limiting is carried out on the LED light source circuit by the voltage-divider current-limiting resistor. Thus, current-limiting protection of LEDs in the LED light source circuit is realized, LEDs are driven by stable voltage and current to operate, LEDs can be prevented from being burned out due to large electric current, service life of LEDs is guaranteed, and uniform and stable displaying brightness of LEDs is realized.

Description

A kind of led drive circuit

Technical field

The utility model relates to LED and drives field, particularly a kind of led drive circuit.

Background technology

The LED illumination is a kind of new type light source of rapid rising development in recent years, and its many good characteristics make that its application surface is more and more wider.The unilateal conduction characteristic of LED makes LED must be equipped with led drive circuit and could work, and led drive circuit is the special power supply of a kind of LED of aiming at power supply, need have simple circuit configuration, less volume and the high conversion rate of taking.Existing led drive circuit can be divided into two big classes by type of drive: a kind of is the constant current mode drive circuit, and another kind is the type voltage regulation drive circuit.The voltage stabilizing drive circuit after determining parameters, output be fixed voltage, but the electric current of output can change along with the increase and decrease of load, and the change in voltage after the rectification can influence the brightness of LED; In addition, temperature can raise during LED work, and along with the rising of LED temperature, the internal resistance meeting of LED reduces, thereby can cause the LED operating current to raise, and after surpassing its rated operational current, can influence the useful life of LED product, and serious meeting burns out LED.

Therefore, how designing the led drive circuit that a kind of energy will carry out current limliting to LED is the technical problem that needs to be resolved hurrily in the industry.

Summary of the invention

Main purpose of the present utility model provides a kind of led drive circuit, is intended to realize LED is carried out current-limiting protection, and increased the useful life of LED, prevents that LED from being burnt out, and the brightness that realization LED shows is even, stable.

The utility model proposes a kind of led drive circuit, the input protection circuit, reduction voltage circuit, current rectifying and wave filtering circuit and the led light source circuit that comprise electric connection, described current rectifying and wave filtering circuit is full-wave voltage doubler, and described full-wave voltage doubler comprises two rectifier diodes and two filter capacitors; Described led drive circuit also comprises at least one current-limiting resistor voltage divider, and described current-limiting resistor voltage divider is connected with described led light source circuit.

Preferably, described current-limiting resistor voltage divider is provided with 1 ~ 6, series connection mutually between the described current-limiting resistor voltage divider, and the resistance of described current-limiting resistor voltage divider is 22 ~ 68 Ω.

Preferably, described current-limiting resistor voltage divider can be connected on the negative or positive electrode of described led light source circuit.

Preferably, described input protection circuit is made up of a fuse.

Preferably, described reduction voltage circuit is made up of decompression capacitor and first bleeder resistance, and described first bleeder resistance is connected in parallel on the two ends of described decompression capacitor.

Preferably, described decompression capacitor is polypropylene film electric capacity.

Preferably, described led light source circuit is composed in series by several LED.

Preferably, two described filter capacitor series connection, the series connection of two described rectifier diodes, two described rectifier diodes of series connection and the two described filter capacitor parallel connections of connecting, described full-wave voltage doubler also comprise one with second bleeder resistance of the two described filter capacitor parallel connections of connecting.

Led drive circuit of the present utility model comprises input protection circuit, reduction voltage circuit, current rectifying and wave filtering circuit and the led light source circuit of electric connection, the led drive circuit external AC, High Level AC Voltage is through the reduction voltage circuit step-down, again the direct voltage of output smoothing after the rectifies in current rectifying and wave filtering circuit and the filter capacitor filtering; LED work in the direct voltage drive led light source circuit of current rectifying and wave filtering circuit output.The utility model adopts at least one current-limiting resistor voltage divider to connect with the led light source circuit; thereby the led light source circuit is carried out current limliting; realization is carried out current-limiting protection to the LED in the led light source circuit; LED under driving, stable voltage and current is worked; prevent that LED from being burnt out because electric current is excessive; guarantee the useful life of LED, and realize that the brightness of LED demonstration is even, stable.

Description of drawings

Fig. 1 is the circuit diagram of led drive circuit among the embodiment of led drive circuit of the present utility model.

The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.

Embodiment

Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

With reference to Fig. 1, an embodiment of led drive circuit of the present utility model is proposed, this led drive circuit is AC driving circuit, comprises the input protection circuit, reduction voltage circuit 1, current rectifying and wave filtering circuit 2 and the led light source circuit 3 that electrically connect successively.The alternating current input is connected with input protection circuit; this input protection circuit is made up of a fuse F; the effect of fuse F provides the circuit safety protection; under the situation of short circuit or serious overload; fuse F fusing automatically disconnects circuit, thereby realizes short-circuit protection or serious overload protection.

The input of reduction voltage circuit 1 links to each other with the output of input protection circuit, is used for the High Level AC Voltage of input is carried out step-down.Reduction voltage circuit 1 is made up of decompression capacitor C1 and the first bleeder resistance R1, and decompression capacitor C1 can produce capacitive reactance under certain AC signal frequency, thereby the maximum operating currenbt of restriction led drive circuit is realized the current limliting step-down.Decompression capacitor C1 is CBB22 polypropylene film electric capacity, and volume is little, economical, reliable, efficient is high.The first bleeder resistance R1 is connected in parallel on the two ends of decompression capacitor C1, and being used for provides the path of releasing to decompression capacitor C1, so that after decompression capacitor C1 quits work, and the decompression capacitor C1 two ends electric energy stored of releasing.

The input of current rectifying and wave filtering circuit 2 links to each other with the output of reduction voltage circuit 1, and reduction voltage circuit 1 carries out High Level AC Voltage to export to current rectifying and wave filtering circuit 2 after the step-down, carries out rectifying and wave-filtering by current rectifying and wave filtering circuit 2.Current rectifying and wave filtering circuit 2 is full-wave voltage doubler, comprise two rectifier diode D1, D2, two filter capacitor C2, C3 and the second bleeder resistance R2, two filter capacitor C2, C3 series connection, two rectifier diode D1, D2 series connection, two rectifier diode D1, the D2 and two filter capacitor C2, the C3 parallel connection of connecting of series connection, the second bleeder resistance R2 is connected in parallel on two filter capacitor C2 of series connection, the two ends of C3, constitutes a full-wave voltage doubler.The second bleeder resistance R2 is used for providing the path of releasing to filter capacitor C2, C3, so that after filter capacitor C2, C3 quit work, and its two ends electric energy stored of releasing.The reduction voltage circuit output is connected between two rectifier diode D1, the D2 and between two filter capacitor C2, the C3, during circuit working, the full-wave voltage doubler that two rectifier diode Dl, D2 and two capacitor C 2, C3 form carries out rectification, filtering to the alternating voltage of input, obtains a level and smooth direct voltage and output.

Led light source circuit 3 is composed in series by several LED, and led light source circuit 3 links to each other with the output of current rectifying and wave filtering circuit 2, the LED work in the direct voltage drive led light source circuit 3 of current rectifying and wave filtering circuit 2 outputs.

For making the current stabilization of led light source circuit 3, led drive circuit of the present utility model also comprises at least one current-limiting resistor voltage divider R3, and current-limiting resistor voltage divider R3 connects with led light source circuit 3, for reducing the electric current in the led light source circuit 3, plays metering function.Current-limiting resistor voltage divider R3 can arrange 1 ~ 6Individual, the current-limiting resistor voltage divider R3 in the present embodiment is provided with four, series connection mutually between the current-limiting resistor voltage divider R3, and the resistance of current-limiting resistor voltage divider R3 is 22 ~ 68 Ω.This led drive circuit external AC, High Level AC Voltage be through reduction voltage circuit 1 step-down, again the direct voltage of output smoothing after the rectifies in current rectifying and wave filtering circuit 2 and the filter capacitor filtering; Adopt current-limiting resistor voltage divider R3 to connect with led light source circuit 3 again; thereby led light source circuit 3 is carried out current limliting; realization is carried out current-limiting protection to the LED in the led light source circuit 3; LED under driving, stable voltage and current is worked; prevent that LED from being burnt out because electric current is excessive; guarantee the useful life of LED, and realize that the brightness of LED demonstration is even, stable.

In addition, current-limiting resistor voltage divider R3 can partly be connected on the positive pole of led light source circuit 3, and part is connected on the negative pole of led light source circuit 3, makes things convenient for current-limiting resistor voltage divider R3 the putting of position in circuit board.

The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.

Claims (8)

1. led drive circuit, the input protection circuit, reduction voltage circuit, current rectifying and wave filtering circuit and the led light source circuit that comprise electric connection, it is characterized in that, described current rectifying and wave filtering circuit is full-wave voltage doubler, and described full-wave voltage doubler comprises two rectifier diodes and two filter capacitors; Described led drive circuit also comprises at least one current-limiting resistor voltage divider, and described current-limiting resistor voltage divider is connected with described led light source circuit.
2. led drive circuit according to claim 1 is characterized in that, described current-limiting resistor voltage divider is provided with 1 ~ 6, series connection mutually between the described current-limiting resistor voltage divider, and the resistance of described current-limiting resistor voltage divider is 22 ~ 68 Ω.
3. led drive circuit according to claim 2 is characterized in that, described current-limiting resistor voltage divider can be connected on the negative or positive electrode of described led light source circuit.
4. according to claim 1 or 2 or 3 described led drive circuits, it is characterized in that described input protection circuit is made up of a fuse.
5. according to claim 1 or 2 or 3 described led drive circuits, it is characterized in that described reduction voltage circuit is made up of decompression capacitor and first bleeder resistance, described first bleeder resistance is connected in parallel on the two ends of described decompression capacitor.
6. led drive circuit according to claim 5 is characterized in that, described decompression capacitor is polypropylene film electric capacity.
7. according to each described led drive circuit in the claim 1 to 3, it is characterized in that described led light source circuit is composed in series by several LED.
8. according to claim 1 or 2 or 3 described led drive circuits, it is characterized in that, two described filter capacitor series connection, two described rectifier diode series connection, the two described rectifier diodes and the two described filter capacitor parallel connections of connecting of series connection, described full-wave voltage doubler also comprise one with second bleeder resistance of the two described filter capacitor parallel connections of connecting.
CN 201220746019 2012-12-31 2012-12-31 LED drive circuit CN203181275U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220746019 CN203181275U (en) 2012-12-31 2012-12-31 LED drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220746019 CN203181275U (en) 2012-12-31 2012-12-31 LED drive circuit

Publications (1)

Publication Number Publication Date
CN203181275U true CN203181275U (en) 2013-09-04

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Application Number Title Priority Date Filing Date
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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105554960A (en) * 2016-02-04 2016-05-04 浙江富春照明电器有限公司 Light emitting diode (LED) driving circuit special for AC 110V
CN105657913A (en) * 2016-03-31 2016-06-08 中山市帝森电子科技有限公司 LED driving power supply
CN105655132A (en) * 2016-03-31 2016-06-08 中山市中广科研技术服务有限公司 Electrolytic capacitor
CN105679539A (en) * 2016-03-31 2016-06-15 中山市中广科研技术服务有限公司 Rectification filter
CN105702463A (en) * 2016-03-31 2016-06-22 中山市帝森电子科技有限公司 Anti-creeping rectifier filter
CN105702469A (en) * 2016-03-31 2016-06-22 中山市帝森电子科技有限公司 Full-wave voltage-doubling rectifying circuit
CN105702462A (en) * 2016-03-31 2016-06-22 中山市中广科研技术服务有限公司 Rectifier filter with simple circuit
CN105702461A (en) * 2016-03-31 2016-06-22 中山市中广科研技术服务有限公司 Simple and safe rectifier filter
CN105702467A (en) * 2016-03-31 2016-06-22 中山市帝森电子科技有限公司 Quick heat dissipation type patch electrolytic capacitor
CN105722275A (en) * 2016-03-31 2016-06-29 中山市中广科研技术服务有限公司 LED drive device with stable performance
CN105743366A (en) * 2016-03-31 2016-07-06 中山市中广科研技术服务有限公司 Safe and stable rectifier filter
CN105742055A (en) * 2016-03-31 2016-07-06 中山市中广科研技术服务有限公司 Rectifier filter with stable performance
CN105764190A (en) * 2016-03-31 2016-07-13 中山市中广科研技术服务有限公司 Safe and stable LED driving device
CN105764191A (en) * 2016-03-31 2016-07-13 中山市高乐电子科技有限公司 LED driving device with good heat dissipation performance
CN105764192A (en) * 2016-03-31 2016-07-13 中山市帝森电子科技有限公司 LED driving power supply having current limiting function
CN105792420A (en) * 2016-03-31 2016-07-20 中山市中广科研技术服务有限公司 LED driving device with stable performance
CN105810436A (en) * 2016-03-31 2016-07-27 中山市中广科研技术服务有限公司 Rectification filter device with high cooling performance
CN105810438A (en) * 2016-03-31 2016-07-27 中山市帝森电子科技有限公司 Light emitting diode (LED) driving power supply for driving LED
CN105828476A (en) * 2016-03-31 2016-08-03 中山市高乐电子科技有限公司 LED driving power supply with good heat dissipation
CN105848335A (en) * 2016-03-31 2016-08-10 中山市中广科研技术服务有限公司 Safe and anti-leakage rectifying and filtering device
CN105848336A (en) * 2016-03-31 2016-08-10 中山市高乐电子科技有限公司 LED driver
CN105873265A (en) * 2016-03-31 2016-08-17 中山市帝森电子科技有限公司 Rectifier and filter device with compact structure
CN105873264A (en) * 2016-03-31 2016-08-17 中山市中广科研技术服务有限公司 Light emitting diode (LED) driving power supply having current-limiting protection
CN105873268A (en) * 2016-03-31 2016-08-17 中山市高乐电子科技有限公司 Safe anti-creeping LED driver
CN105873266A (en) * 2016-03-31 2016-08-17 中山市帝森电子科技有限公司 Anti-creeping LED drive device
CN105873267A (en) * 2016-03-31 2016-08-17 中山市中广科研技术服务有限公司 LED drive device
CN105869883A (en) * 2016-03-31 2016-08-17 中山市帝森电子科技有限公司 SMD type capacitor
CN105898914A (en) * 2016-03-31 2016-08-24 中山市中广科研技术服务有限公司 Rectifying and filtering device
CN105915071A (en) * 2016-03-31 2016-08-31 中山市高乐电子科技有限公司 Rectification filter with compact structure

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105554960A (en) * 2016-02-04 2016-05-04 浙江富春照明电器有限公司 Light emitting diode (LED) driving circuit special for AC 110V
CN105764192A (en) * 2016-03-31 2016-07-13 中山市帝森电子科技有限公司 LED driving power supply having current limiting function
CN105655132A (en) * 2016-03-31 2016-06-08 中山市中广科研技术服务有限公司 Electrolytic capacitor
CN105679539A (en) * 2016-03-31 2016-06-15 中山市中广科研技术服务有限公司 Rectification filter
CN105702463A (en) * 2016-03-31 2016-06-22 中山市帝森电子科技有限公司 Anti-creeping rectifier filter
CN105702469A (en) * 2016-03-31 2016-06-22 中山市帝森电子科技有限公司 Full-wave voltage-doubling rectifying circuit
CN105702462A (en) * 2016-03-31 2016-06-22 中山市中广科研技术服务有限公司 Rectifier filter with simple circuit
CN105702461A (en) * 2016-03-31 2016-06-22 中山市中广科研技术服务有限公司 Simple and safe rectifier filter
CN105702467A (en) * 2016-03-31 2016-06-22 中山市帝森电子科技有限公司 Quick heat dissipation type patch electrolytic capacitor
CN105722275A (en) * 2016-03-31 2016-06-29 中山市中广科研技术服务有限公司 LED drive device with stable performance
CN105743366A (en) * 2016-03-31 2016-07-06 中山市中广科研技术服务有限公司 Safe and stable rectifier filter
CN105742055A (en) * 2016-03-31 2016-07-06 中山市中广科研技术服务有限公司 Rectifier filter with stable performance
CN105764190A (en) * 2016-03-31 2016-07-13 中山市中广科研技术服务有限公司 Safe and stable LED driving device
CN105764191A (en) * 2016-03-31 2016-07-13 中山市高乐电子科技有限公司 LED driving device with good heat dissipation performance
CN105657913A (en) * 2016-03-31 2016-06-08 中山市帝森电子科技有限公司 LED driving power supply
CN105792420A (en) * 2016-03-31 2016-07-20 中山市中广科研技术服务有限公司 LED driving device with stable performance
CN105810436A (en) * 2016-03-31 2016-07-27 中山市中广科研技术服务有限公司 Rectification filter device with high cooling performance
CN105810438A (en) * 2016-03-31 2016-07-27 中山市帝森电子科技有限公司 Light emitting diode (LED) driving power supply for driving LED
CN105828476A (en) * 2016-03-31 2016-08-03 中山市高乐电子科技有限公司 LED driving power supply with good heat dissipation
CN105848335A (en) * 2016-03-31 2016-08-10 中山市中广科研技术服务有限公司 Safe and anti-leakage rectifying and filtering device
CN105848336A (en) * 2016-03-31 2016-08-10 中山市高乐电子科技有限公司 LED driver
CN105873265A (en) * 2016-03-31 2016-08-17 中山市帝森电子科技有限公司 Rectifier and filter device with compact structure
CN105873264A (en) * 2016-03-31 2016-08-17 中山市中广科研技术服务有限公司 Light emitting diode (LED) driving power supply having current-limiting protection
CN105873268A (en) * 2016-03-31 2016-08-17 中山市高乐电子科技有限公司 Safe anti-creeping LED driver
CN105873266A (en) * 2016-03-31 2016-08-17 中山市帝森电子科技有限公司 Anti-creeping LED drive device
CN105873267A (en) * 2016-03-31 2016-08-17 中山市中广科研技术服务有限公司 LED drive device
CN105869883A (en) * 2016-03-31 2016-08-17 中山市帝森电子科技有限公司 SMD type capacitor
CN105898914A (en) * 2016-03-31 2016-08-24 中山市中广科研技术服务有限公司 Rectifying and filtering device
CN105915071A (en) * 2016-03-31 2016-08-31 中山市高乐电子科技有限公司 Rectification filter with compact structure

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Granted publication date: 20130904

Termination date: 20141231