CN107548206A - By identifying that LED Vf values adjust the driving power circuit of output voltage - Google Patents
By identifying that LED Vf values adjust the driving power circuit of output voltage Download PDFInfo
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- CN107548206A CN107548206A CN201710835176.2A CN201710835176A CN107548206A CN 107548206 A CN107548206 A CN 107548206A CN 201710835176 A CN201710835176 A CN 201710835176A CN 107548206 A CN107548206 A CN 107548206A
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- led
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- power circuit
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- output voltage
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Abstract
The present invention discloses the driving power circuit that a kind of Vf values by identifying LED adjust output voltage, includes switching power circuit, it is characterised in that：Also include the pwm chip feedback link of the Vf value measuring circuits of measurement load LED Vf values, Vf values measuring circuit and switching power circuit.The AC DC output dc voltages of LED drive power of the present invention, can be according to load LED Vf value size adjust automaticallies, make output dc voltage only higher 2.5~3V than loading LED Vf values, LED load is lighted with optimal magnitude of voltage, so as to improve the utilization rate of LED drive power and efficiency.
Description
Technical field
The present invention relates to LED drive power technical field.
Background technology
The LED drive power circuit of market is all that one constant voltage of output goes driving load LED light after AC-DC at present
Source.Ensure that LED light source is lighted, it is necessary to which the D/C voltage of LED drive power AC-DC outputs is higher than the Vf values of LED light source.So
Power supply on the market is all one value range of output, even if the load LED of relatively low Vf values, also to export higher D/C voltage expires
Foot so that the utilization rate and efficiency of whole power supply are all than relatively low.Therefore, it is necessary to research and develop it is a kind of can be according to the Vf values of LED load
And LED drive power output dc voltage is adjusted, the circuit of LED load is lighted with optimum voltage value so that the utilization of whole power supply
Rate and efficiency get a promotion.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of Vf values that LED can be loaded with automatic identification, adjustment AC-DC are defeated
Go out the circuit of D/C voltage.
Technical scheme used by solve above-mentioned technical problem：A kind of Vf values by identifying LED adjust output voltage
Driving power circuit, include switching power circuit, it is characterised in that：The Vf values for also including measurement load LED Vf values are surveyed
Measure the pwm chip feedback link of circuit, Vf values measuring circuit and switching power circuit.
It may be preferred that the Vf values measuring circuit uses divider resistance sample circuit.
On the basis of the above, the luminous tube drive connection of the pwm chip and an optocoupler, the light-receiving tube series connection of optocoupler
Vf value measuring circuits.
Using beneficial effect caused by the present invention：The AC-DC output dc voltages of LED drive power of the present invention, Ke Yigen
According to load LED Vf value size adjust automaticallies, make output dc voltage only higher 2.5~3V than loading LED Vf values, with optimal electricity
Pressure value lights LED load, so as to improve the utilization rate of LED drive power and efficiency.
Brief description of the drawings
Fig. 1 is the electrical schematic diagram of LED drive power of the present invention.
Embodiment
As shown in figure 1, a kind of Vf values by identifying LED adjust the driving power circuit of output voltage, include switch
Power circuit, the switching power circuit are conventional LED drive power circuit, mainly include transformer 1, switching tube 2, control
The driving chip 3 of switching tube 2, the optocoupler 4 and pwm chip 5 for being responsible for Coupled Feedback.In the present invention, LED drivings electricity
Source circuit also includes the Vf values measuring circuit 6 of measurement load LED Vf values, Vf values measuring circuit 6 and the PWM of switching power circuit
The feedback link of control chip 5.
After LED drive power circuit is powered, the load LED measured Vf values are fed back to PWM and controlled by Vf values measuring circuit 6
Coremaking piece 5, made comparisons with the output dc voltage of driving power, it is bigger 2.5-3V than LED Vf values as most to set output dc voltage value
It is good, and if optimum value have a deviation, pwm chip 5 makes switching power circuit AC-DC by changing the dutycycle of pwm signal
Output dc voltage value maintain optimum value, so as to realize automatic identification load LED Vf values adjust AC-DC output voltages mesh
's.
In the present embodiment, the Vf values measuring circuit 6 uses divider resistance sample circuit, the divider resistance sample circuit
Load LED negative pole end is attached to, the common port between divider resistance is connected as measurement point with pwm chip 5.
Further, this LED drive power circuit can control Vf values measuring circuit 6 using an optocoupler 7.Specifically, will
The luminous tube drive connection of pwm chip 5 and optocoupler 7, the light-receiving tube series connection Vf values measuring circuit 6 of optocoupler 7.LED driving electricity
After source circuit is powered, pwm chip 5 can export the control signal of higher duty cycle, make the constant DC electricity that AD-DC outputs are initial
The bright LED light source of pressure point, then pwm chip 5 drive optocoupler 7 turn on, Vf values measuring circuit 6 works, by the LED of measurement Vf
Magnitude of voltage feeds back to pwm chip 5, and controlling switch power circuit AC-DC output dc voltage value maintains optimum value, it is ensured that
LED light source is reliably lighted and steady operation, and then improves the utilization rate and efficiency of LED drive power.
Claims (3)
1. a kind of Vf values by identifying LED adjust the driving power circuit of output voltage, include switching power circuit, it is special
Sign is：Also include the PWM of the Vf value measuring circuits of measurement load LED Vf values, Vf values measuring circuit and switching power circuit
Control chip feedback link.
2. the Vf values according to claim 1 by identifying LED adjust the driving power circuit of output voltage, its feature exists
In：The Vf values measuring circuit uses divider resistance sample circuit.
3. the Vf values according to claim 1 or 2 by identifying LED adjust the driving power circuit of output voltage, it is special
Sign is：The luminous tube drive connection of the pwm chip and an optocoupler, the light-receiving tube series connection Vf value measuring circuits of optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710835176.2A CN107548206A (en) | 2017-09-15 | 2017-09-15 | By identifying that LED Vf values adjust the driving power circuit of output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710835176.2A CN107548206A (en) | 2017-09-15 | 2017-09-15 | By identifying that LED Vf values adjust the driving power circuit of output voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107548206A true CN107548206A (en) | 2018-01-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710835176.2A Pending CN107548206A (en) | 2017-09-15 | 2017-09-15 | By identifying that LED Vf values adjust the driving power circuit of output voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107548206A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108834264A (en) * | 2018-07-30 | 2018-11-16 | 中山市蓝德电子有限公司 | A kind of LED light strip driving circuit with automatic adjustment power |
| CN110366291A (en) * | 2019-07-05 | 2019-10-22 | 欧普照明股份有限公司 | With more specification light source load Auto-matchings for electric drive, lamps and lanterns and driving method |
| CN110461056A (en) * | 2019-07-05 | 2019-11-15 | 欧普照明股份有限公司 | The more specification light source loads of Auto-matching for electric drive, lamps and lanterns and driving method |
| CN110996457A (en) * | 2019-12-31 | 2020-04-10 | 惠州视维新技术有限公司 | LED drive circuit, device, LED control protection method and storage medium |
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| CN106211485A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Current control circuit and apply its LED drive circuit |
| CN106455211A (en) * | 2016-10-09 | 2017-02-22 | 浙江大学城市学院 | Control method for novel same-power universal driving power supply for LED lamp |
| CN106954293A (en) * | 2016-06-17 | 2017-07-14 | 上海占空比电子科技有限公司 | The efficient actinic LED drive circuit of thyristor regulating |
| CN207150913U (en) * | 2017-09-15 | 2018-03-27 | 佛山市华全电气照明有限公司 | By identifying that LED Vf values adjust the driving power circuit of output voltage |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20110084615A1 (en) * | 2008-03-17 | 2011-04-14 | Eldolab Holding B.V. | Led assembly, led fixture, control method and software program |
| CN103582257A (en) * | 2013-11-03 | 2014-02-12 | 胡军 | LED driving device and method |
| CN106954293A (en) * | 2016-06-17 | 2017-07-14 | 上海占空比电子科技有限公司 | The efficient actinic LED drive circuit of thyristor regulating |
| CN106211485A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Current control circuit and apply its LED drive circuit |
| CN106455211A (en) * | 2016-10-09 | 2017-02-22 | 浙江大学城市学院 | Control method for novel same-power universal driving power supply for LED lamp |
| CN207150913U (en) * | 2017-09-15 | 2018-03-27 | 佛山市华全电气照明有限公司 | By identifying that LED Vf values adjust the driving power circuit of output voltage |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108834264A (en) * | 2018-07-30 | 2018-11-16 | 中山市蓝德电子有限公司 | A kind of LED light strip driving circuit with automatic adjustment power |
| CN110366291A (en) * | 2019-07-05 | 2019-10-22 | 欧普照明股份有限公司 | With more specification light source load Auto-matchings for electric drive, lamps and lanterns and driving method |
| CN110461056A (en) * | 2019-07-05 | 2019-11-15 | 欧普照明股份有限公司 | The more specification light source loads of Auto-matching for electric drive, lamps and lanterns and driving method |
| CN110461056B (en) * | 2019-07-05 | 2024-04-09 | 欧普照明股份有限公司 | Power supply driving, lamp and driving method capable of automatically matching loads of multiple light sources |
| CN110366291B (en) * | 2019-07-05 | 2024-04-09 | 欧普照明股份有限公司 | Power supply driving and lamp automatically matched with loads of light sources with multiple specifications and driving method |
| CN110996457A (en) * | 2019-12-31 | 2020-04-10 | 惠州视维新技术有限公司 | LED drive circuit, device, LED control protection method and storage medium |
| WO2021135278A1 (en) * | 2019-12-31 | 2021-07-08 | 惠州视维新技术有限公司 | Led drive circuit, device, led control and protection method, and storage medium |
| CN110996457B (en) * | 2019-12-31 | 2023-05-23 | 惠州视维新技术有限公司 | LED driving circuit, device, LED control protection method and storage medium |
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