CN202799315U - Overshoot-free light-emitting diode (LED) linear constant current drive circuit - Google Patents
Overshoot-free light-emitting diode (LED) linear constant current drive circuit Download PDFInfo
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- CN202799315U CN202799315U CN201220481176XU CN201220481176U CN202799315U CN 202799315 U CN202799315 U CN 202799315U CN 201220481176X U CN201220481176X U CN 201220481176XU CN 201220481176 U CN201220481176 U CN 201220481176U CN 202799315 U CN202799315 U CN 202799315U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model discloses an overshoot-free light-emitting diode (LED) linear constant current drive circuit. The overshoot-free LED linear constant current drive circuit comprises an input rectifier bridge, an input voltage detecting network, a power network, an LED constant current drive circuit core control unit and an LED control switch. One end of the input voltage detecting network is connected with the input voltage detecting network, and the other end of the input voltage detecting network is grounded. The power network is formed by connecting a resistor and a capacitor in series. One end of the power network is connected with the input voltage detecting network, and the other end of the power network is grounded. The input end of the LED constant current drive circuit core control unit is respectively connected with the input voltage detecting network and the power network. The input end of the LED control switch is respectively connected with the output end of the LED constant current drive circuit core control unit, and the output end of the LED control switch is connected to a LED lamp string. By adopting the overshoot-free LED linear constant current drive circuit, the shortcomings of a common LED linear drive circuit can be overcome, the using efficiency of an LED can be effectively improved, the advantages of low cost, high power factor and the like are considered, and the engineering applicability is high.
Description
Technical field
The utility model relates to a kind of without the linear constant-current drive circuit of overshoot LED, and it can regulate LED brightness by the size that changes input controllable silicon regulator cut angle.
Background technology
Fig. 1 is the common linear constant-current drive circuit of high-voltage LED.Rectifier diode 101,102 among the figure, and 103,104 form AC input rectifying bridge.LED1, LED2, LED3 are LED lamp string, are comprised of plurality of LEDs.LED lamp string LED1, LED2, LED3 connects, the output of the anodic bonding rectifier bridge of LED1.Resistance 111 is high accuracy LED current sense resistor, and REFcs is internal reference voltage, and operational amplifier 120, power MOS pipe 121 and current sense resistor jointly form the linear constant current of LED and drive network.
Because LED1 lamp string is in series by a lot of single LEDs, so forward conduction voltage is very high.According to the principle of LED conducting, only be higher than LED1 at input voltage 112, during forward conduction voltage that LED2, LED3 connect, LED1, LED2, LED3 just can light.In the system of mains-supplied, AC is input as the 50Hz sine wave, through 101,102, and 103,104 rectifier bridges that form, LED1 ~ LED3 just can be lighted when input voltage is higher simultaneously, so the utilance of LED is very low.If reduce LED lamp quantity, although can increase utilance, the power consumption of line circuit is increased greatly, thereby reduce the whole work efficiency of whole LED drive scheme.If the electric current when increase LED lamp is lighted although can improve the brightness of LED, then needs to adopt more high-power LED, thereby increased the cost of system, system power dissipation also can increase thereupon greatly.
The utility model content
For above-mentioned problems of the prior art, can find out that common LED linear drive circuit has many shortcomings in practical engineering application, greatly limited the application of led light source, the purpose of this utility model is: proposed a kind of without the linear constant-current drive circuit of overshoot LED, it can eliminate the various shortcoming in the common LED linear drive circuit, effectively improves the service efficiency of LED, takes into account simultaneously low cost, the advantages such as High Power Factor, engineering adaptability are very high.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of without the linear constant-current drive circuit of overshoot LED, comprising:
One input rectifying bridge is used for input power is carried out rectification;
One input voltage Sampling network, one end connect described input rectifying bridge, other end ground connection;
One electric power network, it is formed by a resistance and a capacitances in series, and described electric power network one end connects described input rectifying bridge, other end ground connection;
One LED constant-current drive circuit key control unit, its input connects respectively described input voltage Sampling network and described electric power network;
One LED control switch, its input connect respectively the output of described LED constant-current drive circuit key control unit, and the output of described LED control switch is connected to LED lamp string;
And
One LED lamp string, described LED lamp string is in series successively by 3 groups of LED lamps, and the negative electrode of every group of LED lamp connects described LED control switch, and the anode of first group of LED lamp is connected with the output of described input rectifying bridge.
The rectification circuit that described input rectifying bridge is comprised of 4 diodes.
Described input voltage Sampling network is in series by 3 resistance successively.
The importation of described LED constant-current drive circuit key control unit, comprise 2 input VS1 and VS2,1 power end VCC and 1 earth terminal GND, wherein power end VCC is connected to the junction of resistance and the electric capacity of described electric power network, input VS1 is connected to the junction of the first resistance and second resistance of described input voltage Sampling network, input VS2 is connected to the junction of the second resistance and the 3rd resistance of described input voltage Sampling network, earth terminal GND ground connection; The output of described LED constant-current drive circuit key control unit comprises 4 output G1, G2, G3 and CS.
Described LED control switch is comprised of 3 power MOS pipes, wherein the grid of 3 power MOS pipes connects respectively 3 output G1, G2, the G3 of described LED constant-current drive circuit key control unit, the source electrode of 3 power MOS pipes is connected to the output CS of described LED constant-current drive circuit key control unit, and the drain electrode of 3 power MOS pipes is connected to respectively the negative electrode of 3 groups of LED lamps.
The output CS of described LED constant-current drive circuit key control unit also connects a current sense resistor Rcs, the other end ground connection of described current sense resistor Rcs.
The beneficial effects of the utility model are: compare with common LED Linear Driving technology, the utility model adopts the voltage detecting control technology, when input voltage is higher, LED1, LED2, LED3 will all open, when input voltage is low, open part LED(LED1) light source, can be implemented in the utilance that improves LED under the prerequisite that does not reduce LED quantity or do not increase the LED electric current.Simultaneously constantly adopt distinctive sampling maintenance technology at Dimming, eliminate the burr of LED drive current, thereby effectively prolong the useful life of led light source.The utility model has also improved the efficient of drive circuit simultaneously, has reduced simultaneously the design cost of system.
Description of drawings
Fig. 1 is a typical LED linear drive circuit;
Fig. 2 be the utility model represent a kind of without the linear constant-current drive circuit of overshoot LED;
Fig. 3 be the integrated LED driving switch without overshoot LED linear drive circuit;
Fig. 4 is the kernel control module without overshoot LED linear drive circuit;
Fig. 5 is for the oscillogram of implementing circuit shown in Figure 4 is described.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.
As shown in Figure 2, a kind of without the linear constant-current drive circuit of overshoot LED.Rectifier diode 101,102 among the figure, and 103,104 form AC input rectifying bridge; LED lamp string comprises three groups of LED1, LED2 and LED3, and every group of LED be comprised of plurality of LEDs, and LED1, LED2 and LED3 connect successively, and the output of the anodic bonding rectifier bridge of LED1.Resistance 205,206 and 207 series connection form the input voltage Sampling network.That described LED constant-current drive circuit key control unit adopts is control IC 110, for the nucleus module of the linear constant-current drive circuit of high-voltage LED, for generation of the control signal of LED control switch 212,213,214.The electric power network that resistance 208 and electric capacity 209 form is for drive circuit nucleus module 210 provides power supply.Current sense resistor 111 is high accuracy LED current sense resistor, and connects with described LED lamp string.Power MOS pipe 212,213,214 control switchs as LED, 212 source electrode connects the negative electrode of LED1 and the anode of LED2.213 drain electrode connects negative electrode and the LED3 anode of LED2.214 drain electrode connects the negative electrode of LED3.212,213,214 source electrode all detects resistance 111 with high-precision current and is connected.
The input voltage Sampling network is used for detecting the voltage of bus 112, and when input voltage is very low, VS1 is lower than the reference voltage of inner setting, and kernel control module 210 is opened LED control switch 212,213 and 214.The output current of LED is mainly controlled by 212, and 213,214 this moments are invalid; Along with input voltage constantly raises, VS1 high pressure inner setting reference voltage, and VS2 still is lower than the inner setting reference voltage, kernel control module 210 controls 212 are closed, 213 and 214 keep conducting, and this moment, the output current of LED was mainly controlled by 213, and 214 this moments are invalid; If input voltage continues to raise, VS1 is higher than internal reference voltage, and VS2 is higher than internal reference voltage at this moment, and kernel control module 210 can close 212 and 213, and this moment, the output current of LED was mainly controlled by 214.
Simultaneously the utility model adopts special sampling to keep module, at input voltage during by high step-down, to the maintenance of sampling of the output voltage values of operational amplifier, effectively prevents the overshoot of LED drive current.
If the design technology support of IC, the control switch 212,213,214 of LED can effectively be integrated in control circuit 210 inside, further reduces the quantity of peripheral component, and is shown in Figure 3, further reduces the cost of LED drive scheme.
Fig. 4 is the implementing circuit of the kernel control module 210 of constant-current control circuit.In this implementing circuit, 402,404 is voltage comparator.The inverting input of voltage comparator 402 connects the output VS1 of voltage detecting network, and in-phase input end connects internal reference voltage REF, and 402 output is as one of input of control circuit 404.The inverting input of voltage comparator 404 connects the output VS2 of voltage detecting network, and in-phase input end connects internal reference voltage REF, and 404 input is as one of input of control circuit 405.404 is operational amplifier, and the in-phase input end of operational amplifier connects the high-precision reference voltage REFcs that is used for control LED electric current, and inverting input connects LED current sense resistor 111, connects simultaneously the drain electrode of LED switch 212,213 and 213.401 output of operation amplifier connects sampling and keeps module 406, the input as 406.The two-way output of sampling hold circuit is respectively as the input of control circuit 403 and control circuit 404, and an other output connects the grid of LED control switch 214.The drain electrode of LED control switch 212 connects the negative electrode of LED1 and the anode of LED2, and the drain electrode of LED control switch 213 connects the negative electrode of LED2 and the anode of LED3, and the drain electrode of LED control switch 214 connects the LED2 negative electrode.
When input voltage is very low, VS1 is lower than the reference voltage REF of inner setting, comparator circuit 402 is output as high level, and control circuit 403 is opened LED control switch 212, and this moment, VS2 was lower than reference voltage REF too certainly, control circuit 404 is opened LED control switch 213, this moment, sample circuit 406 was started working, and the output of operational amplifier is sampled, and the output of using sampling to keep removes to control LED switch 212,213,214 grid;
Along with input voltage constantly raises, VS1 is higher than inner setting reference voltage REF, and VS2 still is lower than the inner setting reference voltage, and comparator circuit 402 is output as low level, and control circuit 403 cuts out LED control switch 212.And this moment, comparator circuit 404 was output as high level, and it is open mode that control circuit 404 keeps LED control switch 213, and this moment, the output current of LED was controlled by 213;
If input voltage continues to raise, VS1 is higher than internal reference voltage, and VS2 also is higher than internal reference voltage at this moment, comparator circuit 402,403 output is low level, and control circuit 403 and control circuit 405 are closed LED control switch 212 and 213, and this moment, the output current of LED was controlled by 214.
Fig. 5 keeps constantly exemplary waveforms figure for sampling, and 112 is the output waveform of rectifier bridge, and in order to describe more clearly this without the advantage of overshoot LED constant-current drive circuit, oscillogram herein is with the process controllable silicon light modulation.502 is the output waveform figure of comparator circuit 402 among Fig. 4, and the reference voltage that is lower than setting as input voltage VLIN is that comparator output U1 becomes high level.503 is the output of operational amplifier 401 among Fig. 4, if do not adopt sampling hold circuit, the output current of LED is shown in 504, because the very large parasitic capacitance of grid of the power switch 212 of LED, operational amplifier to 212 times of regulating in (can cry stabilization time), be t1 ~ t2, can see that the output current of LED has obvious overshoot phenomenon, shown in 504.
The utility model has adopted unique sampling hold circuit, at t3 constantly to the output of operational amplifier 401 maintenance of sampling, 505 outputs for sampling maintenance module, the output that keeps with sampling is as the input of control circuit among Fig. 4 403, because the output that sampling keeps is relatively constant, the situation that does not have the charging and discharging shown in 503 phenomenon of overshoot do not occur so can see the LED electric current behind the adding sampling hold circuit at t1 ~ t2.Relatively LED electric current 504 and 506 can find out with sampling keep module without the linear constant-current drive circuit of overshoot LED, eliminated the overshoot phenomenon of LED, effectively prolonged the useful life of LED.
Described in this specification is preferred embodiment of the present utility model, and above embodiment is only in order to the technical solution of the utility model to be described but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within scope of the present utility model.
Claims (6)
1. one kind without the linear constant-current drive circuit of overshoot LED, it is characterized in that, comprising:
One input rectifying bridge is used for input power is carried out rectification;
One input voltage Sampling network, one end connect described input rectifying bridge, other end ground connection;
One electric power network, it is formed by a resistance and a capacitances in series, and described electric power network one end connects described input rectifying bridge, other end ground connection;
One LED constant-current drive circuit key control unit, its input connects respectively described input voltage Sampling network and described electric power network;
One LED lamp string, described LED lamp string is in series successively by some groups of LED lamps, and the anode of first group of LED lamp is connected with the output of described input rectifying bridge;
And
One LED control switch, formed by the some groups of power MOS pipes corresponding with LED lamp number, control respectively described LED lamp, and the grid of every group of power MOS pipe and source electrode all are connected to respectively the with it output of correspondence of described LED constant-current drive circuit key control unit, and the drain electrode of every group of power MOS pipe is connected to respectively the negative electrode of corresponding with it LED lamp.
2. as claimed in claim 1 a kind of without the linear constant-current drive circuit of overshoot LED, it is characterized in that the rectification circuit that described input rectifying bridge is comprised of 4 diodes.
3. as claimed in claim 1 a kind of without the linear constant-current drive circuit of overshoot LED, it is characterized in that described input voltage Sampling network is in series by 3 resistance successively.
4. as claimed in claim 3 a kind of without the linear constant-current drive circuit of overshoot LED, it is characterized in that, the importation of described LED constant-current drive circuit key control unit, comprise 2 input VS1 and VS2,1 power end VCC and 1 earth terminal GND, wherein power end VCC is connected to the junction of resistance and the electric capacity of described electric power network, input VS1 is connected to the junction of the first resistance and second resistance of described input voltage Sampling network, input VS2 is connected to the junction of the second resistance and the 3rd resistance of described input voltage Sampling network, earth terminal GND ground connection; The output of described LED constant-current drive circuit key control unit comprises 4 output G1, G2, G3 and CS.
5. as claimed in claim 4 a kind of without the linear constant-current drive circuit of overshoot LED, it is characterized in that, described LED control switch is comprised of 3 power MOS pipes, wherein the grid of 3 power MOS pipes connects respectively 3 output G1, G2, the G3 of described LED constant-current drive circuit key control unit, the source electrode of 3 power MOS pipes is connected to the output CS of described LED constant-current drive circuit key control unit, and the drain electrode of 3 power MOS pipes is connected to respectively the negative electrode of described 3 groups of LED lamps.
6. as claimed in claim 5 a kind of without the linear constant-current drive circuit of overshoot LED, it is characterized in that the output CS of described LED constant-current drive circuit key control unit also connects a current sense resistor Rcs, the other end ground connection of described current sense resistor Rcs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220481176XU CN202799315U (en) | 2012-09-18 | 2012-09-18 | Overshoot-free light-emitting diode (LED) linear constant current drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220481176XU CN202799315U (en) | 2012-09-18 | 2012-09-18 | Overshoot-free light-emitting diode (LED) linear constant current drive circuit |
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| CN202799315U true CN202799315U (en) | 2013-03-13 |
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| CN201220481176XU Expired - Fee Related CN202799315U (en) | 2012-09-18 | 2012-09-18 | Overshoot-free light-emitting diode (LED) linear constant current drive circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103179756A (en) * | 2013-03-19 | 2013-06-26 | 深圳市明微电子股份有限公司 | LED (light-emitting diode) linear constant current drive controller with wide input voltage range |
| CN103220859A (en) * | 2013-04-12 | 2013-07-24 | 深圳市明微电子股份有限公司 | Constant-current control circuit and device with same |
| CN104100851A (en) * | 2013-04-08 | 2014-10-15 | 赵依军 | LED (Light Emitting Diode) driving power supply integrated lamp holder |
-
2012
- 2012-09-18 CN CN201220481176XU patent/CN202799315U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103179756A (en) * | 2013-03-19 | 2013-06-26 | 深圳市明微电子股份有限公司 | LED (light-emitting diode) linear constant current drive controller with wide input voltage range |
| CN104100851A (en) * | 2013-04-08 | 2014-10-15 | 赵依军 | LED (Light Emitting Diode) driving power supply integrated lamp holder |
| WO2014166367A1 (en) * | 2013-04-08 | 2014-10-16 | Zhao Yijun | Lamp cap integrated with led drive power supply |
| US9788371B2 (en) | 2013-04-08 | 2017-10-10 | Yijun Zhao | Lamp cap integrated with LED drive power supply |
| CN103220859A (en) * | 2013-04-12 | 2013-07-24 | 深圳市明微电子股份有限公司 | Constant-current control circuit and device with same |
| CN103220859B (en) * | 2013-04-12 | 2016-08-10 | 深圳市明微电子股份有限公司 | Constant-current control circuit and use the device of this circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: ZHANG YI Effective date: 20150803 Owner name: SHANGHAI DUTY CYCLE ELECTRONIC TECHNOLOGY CO., LTD Free format text: FORMER OWNER: ZHANG YI Effective date: 20150803 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150803 Address after: 201203, Shanghai, China (Shanghai) free trade test zone, 3000 East Road, 1 blocks, A building, room 607 Patentee after: Shangahi Duty Cycle Semiconductor Co., Ltd. Address before: California, El Segundo, USA Patentee before: Zhang Yi Patentee before: Zhang Yi |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20190918 |
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| CF01 | Termination of patent right due to non-payment of annual fee |