CN2829281Y - LED lighting drive circuit - Google Patents
LED lighting drive circuit Download PDFInfo
- Publication number
- CN2829281Y CN2829281Y CN 200520036027 CN200520036027U CN2829281Y CN 2829281 Y CN2829281 Y CN 2829281Y CN 200520036027 CN200520036027 CN 200520036027 CN 200520036027 U CN200520036027 U CN 200520036027U CN 2829281 Y CN2829281 Y CN 2829281Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- constant current
- output
- current regulating
- regulating circuit
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses an LED lighting drive circuit which comprises an AC/DC rectification circuit, a DC/DC constant current voltage regulating circuit, and a feedback circuit, wherein the input terminal of the AC/DC rectification circuit is used for connecting an AC power supply, the output terminal of the AC/DC rectification circuit is connected with the voltage input terminal of the DC/DC constant current voltage regulating circuit, the output terminal of the DC/DC constant current voltage regulating circuit is used for driving an LED lamp, the input terminal of the feedback circuit is connected with the output terminal of the DC/DC constant current voltage regulating circuit, and the output terminal of the feedback circuit is connected with the feedback signal input terminal of the DC/DC constant current voltage regulating circuit. The range of adaptable voltage of the utility model is wide. When the power supply voltage fluctuates, stable drive current is provided to an LED luminotron by the DC/DC constant current voltage regulating circuit, the reliability of the circuit is guaranteed, the operating state of the LED lamp is stable, the light output is stable without flicker, the light output efficiency is improved and the service life of the LED lamp is extended.
Description
[technical field]
The utility model relates to a kind of circuit, is specifically related to the illuminating drive circuit of a kind of LED that is used to drive.
[background technology]
Development along with LED (light-emitting diode) technology, the luminosity of LED has obtained increasing substantially, the particularly wherein successful exploitation of white light LEDs, and because little, the long service life of its power consumption, thermal radiation are little, luminous stable, the light-emitting component that makes it to begin as the normal lighting light fixture uses.Present LED lighting device, a class are the temporary lighting devices that adopts direct current supply, owing to need to use battery or storage battery, power supply cost is higher and can produce the old and useless battery pollution, is not suitable for using at room lighting.During another kind of employing Alternating Current Power Supply, because the electrical characteristics of LED, the output of the light of LED is proportional with drive current, and is higher to the power supply stability requirement, when using non-nominal current drives LED, can cause the output of LED light unstable, illuminating effect is not good, and is easy to damage, and has reduced its useful life, therefore, the LED illumination drives higher to the reliability of circuit working.
[summary of the invention]
The purpose of this utility model is exactly:, provide a kind of suitable LED electrical characteristics, make LED illumination high stability, high reliability, the LED illumination driving circuit of long life.
The technical solution adopted in the utility model is: a kind of LED illumination driving circuit, comprise AC/DC rectification circuit, DC/DC constant current regulating circuit, feedback circuit, described AC/DC rectification circuit input end is used to connect AC power, output is connected with described DC/DC constant current regulating circuit voltage input end, and described DC/DC constant current regulating circuit output is used for the driving LED lamp; Described feedback circuit input is connected with described DC/DC constant current regulating circuit output, and output is connected with the feedback signal input of described DC/DC constant current regulating circuit.
Above-mentioned LED illumination driving circuit, described AC/DC rectification circuit comprises filtration module, rectification module, the two series connection, described filtration module input is used to connect AC power.Described filtration module comprises first filter capacitor, transformer, second filter capacitor, and the described first filter capacitor cross-over connection is between one group of end of the same name of described transformer, and the described second filter capacitor cross-over connection is organized between the end of the same name in another of described transformer.Described rectification module comprises full-bridge rectifier, filter capacitor, and described filter capacitor cross-over connection is in the output of described full-bridge rectifier.
Above-mentioned LED illumination driving circuit, described DC/DC constant current regulating circuit comprises switch power module, transformer, rectification module, the former limit input of described transformer is connected with described AC/DC rectification circuit output end anode, described switch power module is connected with AC/DC rectification circuit output end negative terminal, the former limit of described transformer output respectively, and described rectification module is connected with described transformer secondary.Described DC/DC constant current regulating circuit also comprises filtration module, and cross-over connection is in described transformer secondary two ends.Described rectification module comprises the high speed rectifier diode, and its positive pole is connected with described transformer secondary end of the same name, and negative pole is in response to described transformer secondary different name end.Described filtration module is a filter capacitor.
Above-mentioned LED illumination driving circuit, described feedback circuit comprises sampling resistor, compound transistor, optical coupler; Described sampling resistor is serially connected with described DC/DC constant current regulating circuit output, is used for constituting the loop with the LED element; Second collector electrode of described compound transistor, second emitter are in response to the high potential of described DC/DC constant current regulating circuit output, and first collector electrode of described compound transistor, second base stage link to each other; Described optical coupler is in response to first emitter and second collector electrode of described compound transistor, and described optical coupler output is connected with the feedback signal input of described DC/DC constant current regulating circuit.
Because the technique scheme utilization, the utility model compared with prior art has following advantage:
The utility model adopts feedback controling mode, it is wide to be suitable for voltage range, when mains fluctuations, provide stable drive current by DC/DC constant current regulating circuit for the LED luminous tube, guaranteed the reliability of circuit, made the stable working state of LED lamp, light output is stable does not glimmer, improve the efficient of light output, prolong the useful life of LED lamp.
The direct current of the utility model output, ripple ratio is low, good stability, the illumination that therefore is more suitable for LED drives.The utility model can be taked overvoltage or overcurrent protection automatically when LED component wear open circuit or short circuit, avoid damaging circuit; When the LED element just often, the utility model is restarted automatically, need not start shooting again; Therefore circuit reliability height of the present utility model, good stability.
[description of drawings]
Accompanying drawing 1 is a schematic block circuit diagram of the present utility model:
Accompanying drawing 2 is the circuit theory diagrams of embodiment one;
Accompanying drawing 3 is the circuit theory diagrams of embodiment two.
[embodiment]
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment one: shown in accompanying drawing 1 and accompanying drawing 2, as shown in Figure 1, the utility model comprises AC/DC rectification circuit 1, DC/DC constant current regulating circuit 2, feedback circuit 3.
AC/DC rectification circuit 1:AC/DC rectification circuit comprises filtration module, rectification module, city's power supply input is after import filtration module by fuse F1, filtration module is made up of the first filter capacitor CX1, transformer EMIL, the second filter capacitor CX2, (EMI) suppresses to electromagnetic compatibility, imports the power supply that full-bridge rectifier BR1 becomes the AC rectification DC composition; This moment, the ripple ratio height relaxed the ripple ratio that direct current is exported so install filter capacitor HVDC additional.
DC/DC constant current regulating circuit 2:DC/DC constant current regulating circuit comprises switch power module, transformer (T1), rectification module.This example adopts switching power circuit IC LNK306P to work as master component, power supply continues to isolating transformer T1 by the HVDC anode, D pin through Switching Power Supply IC LNK306P, LNK306P drives with PWM (65KHZ) high-frequency mode, isolating transformer T1 is conducting to the HVDC negative terminal with high pressure DC end, make T1 transformer speed-sensitive switch, the conducting electric current, convert low pressure AC (65KHZ) to, again through high speed rectifier diode SD rectification, convert low voltage DC to, export the ripple ratio height of direct current this moment, so install the ripple ratio that filter capacitor VC relaxes direct current output additional.
Feedback circuit 3: feedback circuit comprises sampling resistor RI1 and RI2, compound transistor QIR, optical coupler LTV817B; Sampling resistor is serially connected with DC/DC constant current regulating circuit output, be used for constituting the loop with the LED element, two sampling resistor parallel connections, two ends of parallel branch are connected with first base stage, first emitter of compound transistor respectively, second collector electrode of compound transistor, second emitter are in response to the high potential of DC/DC constant current regulating circuit output, and first collector electrode of compound transistor, second base stage link to each other; Optical coupler is in response to first emitter and second collector electrode of compound transistor, and its output is connected with the feedback signal input of DC/DC constant current regulating circuit.
Owing to adopt current constant mode driving LED lamp, thus electric current by filter capacitor VC anode through the LED positive pole, flow to negative pole, to RI1 and RI2 resistance LED is lighted again, get back to filter capacitor VC negative terminal and finish the loop.The signal that to decide electric current simultaneously sends to the transmitting terminal of optical coupler LTV817B, will decide the signal output of electric current.LNK306P is by the receiving terminal of optical coupler LTV817B; receive the signal of deciding electric current and control the pwm pulse output variable; if during LED damage open circuit; then electric current can send to overvoltage signal the transmitting terminal of optical coupler LTV817B through ZDOP; with overvoltage signal output, LNK306P enters system protection by the receiving terminal reception overvoltage signal of optical coupler LTV817B.Wait for LED upgrade normal can be voluntarily after errorless once again operate as normal it, need not to start shooting again.
If during LED damage short circuit, then electric current can send to the transmitting terminal of optical coupler LTV817B with short-circuit signal through QIR, and short-circuit signal is exported.LNK306P receives short-circuit signal by the receiving terminal of optical coupler LTV817B and enters system protection, wait for LED upgrade normal can be voluntarily after errorless operate as normal once again, need not to start shooting again.This routine power supply accommodation is AC80V to AC240V, and emitting led element is 3 to 5.
Embodiment two: as shown in Figure 3, this example is that with the difference of last example the circuit structure of DC/DC constant current regulating circuit 2 is slightly different, and the parameter of each electronic component is also slightly different on selecting, its voltage range that is suitable for is AC36V to AC230V, and power output is also slightly different.
Foregoing circuit can be arranged on the pcb board, and in external shell, supporting mechanism and electrical connector together, constitutes the LED lighting.
Claims (10)
1, a kind of LED illumination driving circuit, it is characterized in that: comprise AC/DC rectification circuit, DC/DC constant current regulating circuit, feedback circuit, described AC/DC rectification circuit input end is used to connect AC power, output is connected with described DC/DC constant current regulating circuit voltage input end, and described DC/DC constant current regulating circuit output is used for the driving LED lamp; Described feedback circuit input is connected with described DC/DC constant current regulating circuit output, and output is connected with the feedback signal input of described DC/DC constant current regulating circuit.
2, LED illumination driving circuit as claimed in claim 1 is characterized in that: described AC/DC rectification circuit comprises filtration module, rectification module, the two series connection, and described filtration module input is used to connect AC power.
3, LED illumination driving circuit as claimed in claim 2, it is characterized in that: described filtration module comprises first filter capacitor (CX1), transformer (EMIL), second filter capacitor (CX2), the described first filter capacitor cross-over connection is between one group of end of the same name of described transformer, and the described second filter capacitor cross-over connection is organized between the end of the same name in another of described transformer.
4, LED illumination driving circuit as claimed in claim 2 is characterized in that: described rectification module comprises full-bridge rectifier (BR1), filter capacitor (HVDC), and described filter capacitor cross-over connection is in the output of described full-bridge rectifier.
5, as each described LED illumination driving circuit among the claim 1-4, it is characterized in that: described DC/DC constant current regulating circuit comprises switch power module, transformer (T1), rectification module, the former limit input of described transformer is connected with described AC/DC rectification circuit output end anode, described switch power module is connected with AC/DC rectification circuit output end negative terminal, the former limit of described transformer output respectively, and described rectification module is connected with described transformer secondary.
6, LED illumination driving circuit as claimed in claim 5 is characterized in that: described DC/DC constant current regulating circuit also comprises filtration module, and cross-over connection is in described transformer secondary two ends.
7, LED illumination driving circuit as claimed in claim 5, it is characterized in that: described feedback circuit comprises sampling resistor, compound transistor, optical coupler; Described sampling resistor is serially connected with described DC/DC constant current regulating circuit output, is used for constituting the loop with the LED element; Second collector electrode of described compound transistor, second emitter are in response to the high potential of described DC/DC constant current regulating circuit output, and first collector electrode of described compound transistor, second base stage link to each other; Described optical coupler is in response to first emitter and second collector electrode of described compound transistor, and described optical coupler output is connected with the feedback signal input of described DC/DC constant current regulating circuit.
8, LED illumination driving circuit as claimed in claim 5 is characterized in that: described rectification module comprises high speed rectifier diode (SD), and its positive pole is connected with described transformer secondary end of the same name, and negative pole is in response to described transformer secondary different name end.
9, LED illumination driving circuit as claimed in claim 6 is characterized in that: described filtration module is filter capacitor (VC).
10, LED illumination driving circuit as claimed in claim 1, it is characterized in that: described feedback circuit comprises sampling resistor, compound transistor, optical coupler; Described sampling resistor is serially connected with described DC/DC constant current regulating circuit output, is used for constituting the loop with the LED element; Second collector electrode of described compound transistor, second emitter are in response to the high potential of described DC/DC constant current regulating circuit output, and first collector electrode of described compound transistor, second base stage link to each other; Described optical coupler is in response to first emitter and second collector electrode of described compound transistor, and described optical coupler output is connected with the feedback signal input of described DC/DC constant current regulating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520036027 CN2829281Y (en) | 2005-11-01 | 2005-11-01 | LED lighting drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520036027 CN2829281Y (en) | 2005-11-01 | 2005-11-01 | LED lighting drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2829281Y true CN2829281Y (en) | 2006-10-18 |
Family
ID=37080830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520036027 Expired - Fee Related CN2829281Y (en) | 2005-11-01 | 2005-11-01 | LED lighting drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2829281Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006051B (en) * | 2009-09-01 | 2015-03-25 | 全汉企业股份有限公司 | Passive current balance actuating device |
| CN114325285A (en) * | 2021-12-31 | 2022-04-12 | 浙江大学杭州国际科创中心 | SiC MOSFET (metal oxide semiconductor field effect transistor) repeated short circuit test method with adjustable gate voltage structure |
| CN114401570A (en) * | 2022-03-25 | 2022-04-26 | 南昌大学 | Visible light communication drive circuit |
-
2005
- 2005-11-01 CN CN 200520036027 patent/CN2829281Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006051B (en) * | 2009-09-01 | 2015-03-25 | 全汉企业股份有限公司 | Passive current balance actuating device |
| CN114325285A (en) * | 2021-12-31 | 2022-04-12 | 浙江大学杭州国际科创中心 | SiC MOSFET (metal oxide semiconductor field effect transistor) repeated short circuit test method with adjustable gate voltage structure |
| CN114401570A (en) * | 2022-03-25 | 2022-04-26 | 南昌大学 | Visible light communication drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101998732A (en) | Driving apparatus for light emitting diodes | |
| CN101636021A (en) | LED constant current driving circuit | |
| CN105764185A (en) | AC driving mixed dimming circuit and television | |
| CN101626652A (en) | Dimmable LED constant current source driver with wide voltage range | |
| CN2798490Y (en) | LED desk lamp | |
| CN2924996Y (en) | Low-cost high-performance LED lighting circuit | |
| CN102548093A (en) | Direct-current light emitting diode (LED) constant-current driving circuit and LED lamp | |
| CN102781134A (en) | Dimmable LED (Light Emitting Diode) driving circuit and lamp | |
| CN201774706U (en) | Drive circuit of semiconductor LED illumination high-brightness ceiling lamp | |
| CN2829281Y (en) | LED lighting drive circuit | |
| CN202721870U (en) | Built-in dimming driving module for LED | |
| CN215222534U (en) | Dimming drive circuit, dimming drive device and lamp | |
| CN101909376A (en) | High-power LED drive circuit | |
| CN2829278Y (en) | LED lighting drive circuit | |
| CN101076213A (en) | LED illuminating light and its controlling circuit | |
| CN102791063A (en) | Intelligent LED module with function of automatic voltage regulation | |
| CN201114894Y (en) | A LED driving circuit | |
| CN203734880U (en) | High voltage integration AC LED multistage linear drive device | |
| CN202261924U (en) | Plug-in LED fluorescent lamp driving power supply device | |
| CN200953677Y (en) | Multiplex drived LED lighting light | |
| CN103383099A (en) | Universal LED fluorescent lamp for electronic ballast | |
| CN202769388U (en) | Led lamp tube | |
| CN201039522Y (en) | LED driver | |
| CN2684516Y (en) | AC power supply LED light fixture | |
| CN218998327U (en) | Dimming non-isolated LED driving power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |