CN102573181A - LED driving circuit and LED lamp - Google Patents
LED driving circuit and LED lamp Download PDFInfo
- Publication number
- CN102573181A CN102573181A CN2010105933613A CN201010593361A CN102573181A CN 102573181 A CN102573181 A CN 102573181A CN 2010105933613 A CN2010105933613 A CN 2010105933613A CN 201010593361 A CN201010593361 A CN 201010593361A CN 102573181 A CN102573181 A CN 102573181A
- Authority
- CN
- China
- Prior art keywords
- constant current
- module
- light source
- led
- power supply
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to an LED driving circuit. The LED driving circuit comprises a first filter module, a rectifier module and a constant current module, wherein the first filter module is connected between a power supply and the input end of the rectifier module, and is used for filtering the electromagnetic interference between the power supply and the driving circuit; the rectifier module is used for receiving an electric signal output by the first filter module, rectifying the electric signal into a DC signal, and outputting the DC signal to the constant current via the rectifier module; the constant current module comprises a constant current chip and a sampling resistor, one end of the sampling resistor is connected with the power supply output end of the rectifier module, and the other end of the sampling resistor is connected with the positive pole of an LED light source; and the constant current chip is used for acquiring and regulating the operation current according to the voltage of the sampling resistor. The invention also relates to an LED lamp. The operation current of the LED light source is acquired and regulated according to the voltage of the sampling resistor, so that the LED driving circuit is suitable for power supply with wide voltage input range, and the situation that over-low input voltage leads to bad illumination effect or over-high voltage affects the service life of the LED light source is prevented.
Description
[technical field]
The present invention relates to electric lighting field, relate in particular to a kind of led drive circuit, also relate to a kind of LED lamp.
[background technology]
LED (light-emitting diode) has energy-saving and environmental protection, characteristics of high efficiency as new type light source, and technology is ripe and be applied to every field.LED is widely used as lighting source, various led drive circuits also occurred thereupon.LED is as the constant current operating load, because LED self requires relatively harshness to operating voltage, overtension is crossed to hang down and all can be caused LED work undesired, so the power supply quality of supply voltage directly affects the reliability of LED.All be to adopt constant current technology to come driving LED at present in the place of alternating current-direct current low-voltage power supply; It has advantages such as power consumption is little, efficient is high, the unit power volume is little, in light weight, but input voltage range is all narrow, crosses when hanging down when its input voltage to cause the LED operating current to reduce; Output light flux reduces; LED can not operate at full capacity, and LED lamp luminous darker brought serious inconvenience to the user.
[summary of the invention]
Based on this, be necessary to provide a kind of led drive circuit that can adapt to wide range input voltage.
A kind of led drive circuit comprises first filtration module, rectification module and constant flow module; Said first filtration module is connected between the input of power supply and said rectification module, is used to filter the electromagnetic interference between power supply and said drive circuit; Said rectification module receives the signal of telecommunication of said first filtration module output, and exports to said constant flow module through the power output end of rectification module after being rectified into direct current signal; Said constant flow module and led light source formation work loop; Said constant flow module carries out voltage sample to said direct current signal; And adjust the conducting in said work loop and the ratio of the time of shutoff according to the voltage swing that sampling obtains, and then the control led light source is through the time cycle of said work loop acquisition electric energy.
Preferably, said constant flow module comprises sampling resistor, energy storage inductor, fly-wheel diode and constant current chip, and said constant current chip comprises power supply input pin, sampling pin, input pin and lower margin; Said power supply input pin links to each other with the power output end of said rectification module, and being used to said constant current chip provides work required power supply; Said input pin connects the negative pole of said led light source, said lower margin ground connection, and said input pin and lower margin are through the switching device composition work loop of said constant current chip internal; The two ends of said sampling resistor connect the power output end and the said sampling pin of said rectification module respectively; And the end that sampling resistor links to each other with the sampling pin is connected the positive pole of said led light source; The sampling pin is used to carry out voltage sample and controls the conducting of said switching device and the ratio of the time of shutoff according to the voltage swing that sampling obtains, and then controls the time of said led light source through said work loop acquisition electric energy; Said energy storage inductor two ends connect the negative pole and the input pin of said led light source respectively, when said switching device turn-offs, continue as said led light source electric energy is provided; The positive pole of said fly-wheel diode connects the end that said energy storage inductor links to each other with input pin, and the negative pole of said fly-wheel diode connects the power output end of said rectification module.
Preferably; Said sampling pin is used to carry out voltage sample and controls the conducting of said switching device and the ratio of the time of shutoff according to the voltage swing that sampling obtains; Be poor according to the voltage of the voltage of said power supply input pin and said sampling pin, control the conducting of said switching device and the ratio of the time of shutoff.
Preferably, said constant current chip also comprises the bypass pin, and connecting between said bypass pin and the ground wire is connected to shunt capacitance.
Preferably, also comprise first filter capacitor, second filter capacitor, the 3rd filter capacitor and the 4th filter capacitor; The positive pole of the said led light source of said first filter capacitor, one termination, the negative pole of the said led light source of another termination; Said second filter capacitor one terminates between said sampling resistor and the sampling pin, other end ground connection; Said the 3rd filter capacitor one end ground connection, the other end connects the negative pole of said led light source; Said the 4th filter capacitor one end ground connection, the said power supply input pin of another termination.
Preferably, said switching device is a metal-oxide-semiconductor.
Preferably; Said first filtration module comprises safety electric capacity, first differential mode inductance and second differential mode inductance; One end of said first differential mode inductance connects the positive pole of said power supply; The other end connects an end of said safety electric capacity, and an end of said second differential mode inductance connects the negative pole of said power supply, and the other end connects the other end of said safety electric capacity.
Preferably, the full-wave bridge rectifier circuit that said rectification module is made up of four diodes, the common cathode of said full-wave bridge rectifier circuit is an output, plus earth altogether.
Preferably, also comprise storage capacitor and the 5th filter capacitor, the two ends of said storage capacitor and the 5th filter capacitor connect the power output end and the ground wire of said rectification module respectively.
A kind of LED lamp also is provided, comprises led drive circuit, said led drive circuit is above-mentioned led drive circuit.
The constant flow module collection of above-mentioned led drive circuit and LED lamp and according to the operating current of the voltage on sampling resistor adjustment led light source; Therefore go for the power supply of wide range input voltage, and can be because of the input voltage of the power supply low excessively illuminating effect that causes is bad or influence life-span of led light source because of overtension.
[description of drawings]
Fig. 1 is the circuit block diagram of led drive circuit among the embodiment;
Fig. 2 is the circuit theory diagrams of led drive circuit among the embodiment.
[embodiment]
For make the object of the invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 1 is the circuit block diagram of led drive circuit among the embodiment, comprises first filtration module 100, rectification module 200 and constant flow module 300.
Fig. 2 is the circuit theory diagrams of led drive circuit among the embodiment.Led drive circuit is applicable to interchange or the DC power supply of 15V～50V among this embodiment.First filtration module 100 comprises safety capacitor C 1, the first differential mode inductance L1 and the second differential mode inductance L2.The end of the first differential mode inductance L1 connects the positive pole 11 of power supply, and the other end connects an end of safety capacitor C 1.The end of the second differential mode inductance L2 connects the negative pole 12 of power supply, and the other end connects the other end of safety capacitor C 1.The safety capacitor C 1 and the first differential mode inductance L1 and the second differential mode inductance L2 are used; Can filter out power and mutual (high frequency) electromagnetic interference (clutter) of led drive circuit; Simultaneously; After safety capacitor C 1 lost efficacy, the phenomenon that can not cause shocking by electricity took place, thereby reaches the effect of avoiding jeopardizing personal safety.Among other embodiment, first filtration module 100 also can adopt other the filter circuit that can the filtering high-frequency electromagnetic disturbs.
In the present embodiment, rectification module 200 is a full-wave bridge rectifier circuit of being made up of four diodes (hereinafter to be referred as rectifier bridge) ZD1, is used for the signal of telecommunication of first filtration module, 100 outputs is rectified into direct current signal.As those skilled in the art were known, the common cathode of rectifier bridge ZD1 was an output, and electric current flows out from here; Plus earth altogether.In other embodiments, rectification module 200 can also adopt other rectification circuit.
In the present embodiment; The output of rectifier bridge ZD1 also is connected with storage capacitor C2 and the 5th filter capacitor C3; The two ends of storage capacitor C2 and the 5th filter capacitor C3 connect the power output end (being the output of rectifier bridge ZD1) and the ground wire of rectification module 200 respectively, are used for guaranteeing the steady fluctuation of circuit voltage and the high frequency clutter that the signal of telecommunication is coupled in filtering.
Energy storage inductor L3 two ends connect the negative pole and the input pin 1 of led light source respectively.The positive pole of sustained diode 1 connects the end that energy storage inductor L3 links to each other with input pin 1, and the negative pole of sustained diode 1 connects the power output end of rectification module 200.
Sampling resistor comprises the first sampling resistor R1 parallel with one another and the second sampling resistor R2.R1 can be identical resistance with R2, can be resistance inequality also, decides according to physical circuit, just can realize the current controlling to led light source through the resistance that changes R1 and R2 like this.The quantity of sampling resistor and resistance are decided according to the real needs of led drive circuit, and the resistance of simple adjustment sampling resistor just can design the operating current that adjustment offers led light source when circuit design.Sampling resistor is that two resistances are 0.33 ohm resistance in the present embodiment.The two ends of sampling resistor connect the power output end and the sampling pin 4 of rectification module 200 respectively, and sampling resistor is connected the positive pole of led light source with sampling pin 4 continuous ends.Constant current chip U1 is according to the time of input pin 1 conducting in the voltage on sampling resistor adjustment work period, and energy storage inductor L3 continues as led light source electric energy is provided when input pin 1 turn-offs.
In the present embodiment, constant current chip U1 adopts the ZXLD1362 chip, and the input voltage range of its power supply input pin 5 and input pin 1 is negative 0.3 to positive 60 volts.Realize the simple LED driving circuit structure through the ZXLD1362 chip, reduced that LED drives cost, circuit structure is simple, easy to maintenance, good reliability.
In the present embodiment, led drive circuit also comprises the first filter capacitor C5, the second filter capacitor C6, the 3rd filter capacitor C4 and the 4th filter capacitor C8.The positive pole of the said led light source of the first filter capacitor C5, one termination, the negative pole of the said led light source of another termination.The second filter capacitor C6 one terminates between sampling resistor and the sampling pin 4, other end ground connection.The 3rd filter capacitor C4 one end ground connection, the other end connects the negative pole of led light source.The 4th filter capacitor C8 one end ground connection, another termination power input pin 5.
Above-mentioned led drive circuit is through being provided with first filtration module at power supply, the high-frequency electromagnetic that filters between power supply and drive circuit disturbs, and has eliminated high-frequency electromagnetic and has disturbed the influence to electronic equipment, driving LED light sources work safely and reliably.And gather and according to the operating current of the adjustment of the voltage on sampling resistor led light source; Therefore go for the power supply of wide range input voltage, and can be because of the input voltage of the power supply low excessively illuminating effect that causes is bad or influence life-span of led light source because of overtension.The resistance that only needs to change sampling resistor just can design the operating current that offers led light source.
The present invention also provides a kind of LED lamp, comprises the led drive circuit of led light source and driving LED light source works.This led drive circuit can adopt Fig. 1 or embodiment illustrated in fig. 2 in led drive circuit.
The above embodiment has only expressed several kinds of execution modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (7)
1. a led drive circuit is characterized in that, comprises first filtration module, rectification module and constant flow module;
Said first filtration module is connected between the input of power supply and said rectification module, is used to filter the electromagnetic interference between power supply and said drive circuit;
Said rectification module receives the signal of telecommunication of said first filtration module output, and exports to said constant flow module through the power output end of rectification module after being rectified into direct current signal;
Said constant flow module comprises constant current chip and sampling resistor, and an end of said sampling resistor connects the power output end of said rectification module, and the other end links to each other with the positive pole of led light source; The collection of said constant current chip is also adjusted the operating current of said led light source according to the voltage on the said sampling resistor.
2. led drive circuit according to claim 1 is characterized in that said constant flow module also comprises energy storage inductor and fly-wheel diode;
The power supply input pin of said constant current chip links to each other with the power output end of said rectification module, and being used to said constant current chip provides work required power supply; The sampling pin of said constant current chip links to each other with the positive pole of said led light source, the lower margin ground connection of said constant current chip; Connect between the bypass pin of said constant current chip and the ground wire and be connected to shunt capacitance; The input pin of said constant current chip connects the negative pole of said led light source through said energy storage inductor;
Said constant current chip is according to the time of the input pin conducting of said constant current chip in the voltage on said sampling resistor adjustment work period, and said energy storage inductor continues as said led light source electric energy is provided when the input pin of said constant current chip turn-offs; The positive pole of said fly-wheel diode connects the end that said energy storage inductor links to each other with the input pin of said constant current chip, and the negative pole of said fly-wheel diode connects the power output end of said rectification module.
3. led drive circuit according to claim 2 is characterized in that, also comprises first filter capacitor, second filter capacitor, the 3rd filter capacitor and the 4th filter capacitor; The positive pole of the said led light source of said first filter capacitor, one termination, the negative pole of the said led light source of another termination; Said second filter capacitor one terminates between said sampling resistor and the sampling pin, other end ground connection; Said the 3rd filter capacitor one end ground connection, the other end connects the negative pole of said led light source; Said the 4th filter capacitor one end ground connection, the said power supply input pin of another termination.
4. led drive circuit according to claim 1; It is characterized in that; Said first filtration module comprises safety electric capacity, first differential mode inductance and second differential mode inductance, and an end of said first differential mode inductance connects the positive pole of said power supply, and the other end connects an end of said safety electric capacity; One end of said second differential mode inductance connects the negative pole of said power supply, and the other end connects the other end of said safety electric capacity.
5. led drive circuit according to claim 1 is characterized in that, the full-wave bridge rectifier circuit that said rectification module is made up of four diodes.
6. led drive circuit according to claim 1 is characterized in that, also comprises storage capacitor and the 5th filter capacitor, and the two ends of said storage capacitor and the 5th filter capacitor connect the power output end and the ground wire of said rectification module respectively.
7. a LED lamp comprises led drive circuit, it is characterized in that, said led drive circuit is any described led drive circuit among the claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105933613A CN102573181A (en) | 2010-12-17 | 2010-12-17 | LED driving circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105933613A CN102573181A (en) | 2010-12-17 | 2010-12-17 | LED driving circuit and LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102573181A true CN102573181A (en) | 2012-07-11 |
Family
ID=46417321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105933613A Pending CN102573181A (en) | 2010-12-17 | 2010-12-17 | LED driving circuit and LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102573181A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1648205A1 (en) * | 2004-10-14 | 2006-04-19 | Sony Corporation | Light emitting element drive device and display system |
| CN101883453A (en) * | 2009-05-05 | 2010-11-10 | 海洋王照明科技股份有限公司 | LED constant current drive circuit |
-
2010
- 2010-12-17 CN CN2010105933613A patent/CN102573181A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1648205A1 (en) * | 2004-10-14 | 2006-04-19 | Sony Corporation | Light emitting element drive device and display system |
| CN101883453A (en) * | 2009-05-05 | 2010-11-10 | 海洋王照明科技股份有限公司 | LED constant current drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103442501B (en) | Forced constant flow source dimming LED (Light Emitting Diode) lamp | |
| CN103139992B (en) | With the LED dimming drive system of controllable silicon bypass light adjusting circuit | |
| CN202050564U (en) | Dimmable LED (Light-emitting Diode) drive circuit | |
| CN102548093A (en) | Direct-current light emitting diode (LED) constant-current driving circuit and LED lamp | |
| CN201813599U (en) | LED (Light-Emitting Diode) dimmer power | |
| CN103298221A (en) | Dimming circuit and method of LED (Light Emitting Diode) lighting lamp | |
| CN102413599A (en) | LED (light-emitting diode) constant-current driving circuit and LED lamp | |
| CN101959348A (en) | LED stepless dimming drive circuit and LED lamp | |
| CN102548092A (en) | Light-emitting diode (LED) drive circuit and LED lamp | |
| CN103687217A (en) | Switching and dimming LED driving circuit | |
| CN201813590U (en) | Driving power supply of light-emitting diode | |
| CN109769321A (en) | A kind of LED lamp circuit with Delayed extinguishing function | |
| CN202652610U (en) | Compatible type LED lamp driver | |
| CN101841951B (en) | LED driving circuit | |
| CN101909376B (en) | High-power LED drive circuit | |
| CN110798927A (en) | LED drive circuit based on T-shaped lamp tube | |
| CN202721870U (en) | Built-in dimming driving module for LED | |
| CN207216474U (en) | A kind of current sample change-over circuit and LED constant current power supply | |
| CN102833902A (en) | Boosting LED (light-emitting diode) constant-current drive circuit | |
| CN104661408B (en) | LED light adjusting circuits and LED lamp | |
| CN102548098A (en) | LED (light emitting diode) constant current driving circuit and LED lamp | |
| CN102781147B (en) | LED (Light-emitting diode) power supply circuit with high power factor | |
| CN203872387U (en) | Power off non-stroboscopic second gear dimmable LED driving power supply | |
| CN1967992B (en) | A buffer switching power supply | |
| CN205883641U (en) | Linear constant current circuit who adjusted luminance in full stroke phase cut angle based on triac dimmer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120711 |