CN107734782A - A kind of new power control output circuit - Google Patents
A kind of new power control output circuit Download PDFInfo
- Publication number
- CN107734782A CN107734782A CN201711142999.3A CN201711142999A CN107734782A CN 107734782 A CN107734782 A CN 107734782A CN 201711142999 A CN201711142999 A CN 201711142999A CN 107734782 A CN107734782 A CN 107734782A
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- CN
- China
- Prior art keywords
- resistance
- operational amplifier
- control output
- output circuit
- power control
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention discloses a kind of new power control output circuit, the circuit includes operational amplifier U1, first resistor R1 and second resistance R2, the operational amplifier U1 are parallel with the resistance R5 and electric capacity C1 mutually concatenated；The first resistor R1 carries out partial pressure with the burning voltage Vcc that second resistance R2 will acquire by connecting and obtains A point magnitudes of voltage, the second resistance R2 ground connection, the A point magnitudes of voltage set input to operational amplifier U1 in-phase input end as power parameter, the stable voltage Vb of a corresponding input current is obtained by operational amplifier U1 inverting input connection resistance R4 again, control output circuit of the invention by setting up, it can solve the problem that and traditional depend merely on the problem of chip controls precision can not meet, output can be accurately controlled by this circuit design, LED outputs are made to meet American Standard safety class2 standards, integrated circuit structure design is simple and practical, it is easy to promote.
Description
Technical field
The present invention relates to electronic technology field, specially a kind of new power control output circuit.
Background technology
With the development of LED technology, LED illumination is more and more extensive in modern society, and LED attracts people's attention as 21 century
New type light source, consequence is gradually occupied in every field, is had a extensive future in illumination with display field, especially quilt now
Widely studied white light LEDs, because its small volume, vibration resistance, fast response time, good directionality, long lifespan reach tens thousand of hours, light
Color can be used to replace incandescent lamp and glimmering close to the advantages that incandescent lamp is photochromic, the pollution of low-voltage driving, mercury-free and lead, developing into
The main green light source of light lamp.
In American Standard driving safety requirement, power output is less than 100W, and appellation class2 of the output voltage less than 60V drives,
Namely SELV drives, and market acceptance is higher than non-high class2 driving, but close to the high-power of 100W
LED constant pressures driving, to meet safety class2 require design difficulty it is larger.
The content of the invention
For problem present in background technology, the invention provides a kind of new power control output circuit.
To achieve the above object, the present invention provides following technical scheme：A kind of new power control output circuit, including fortune
Calculate amplifier U1, first resistor R1 and second resistance R2；The operational amplifier U1 is parallel with the resistance R5 and electric capacity mutually concatenated
The burning voltage Vcc that C1, the first resistor R1 and second resistance R2 will be acquired by connecting carries out partial pressure and obtains A points electricity
Pressure value, the second resistance R2 ground connection, the A point magnitudes of voltage are same mutually defeated as power parameter setting input to operational amplifier U1
Enter end, then the stable voltage of a corresponding input current is obtained by operational amplifier U1 inverting input connection resistance R4
Vb。
As a kind of preferable technical scheme of the present invention, burning voltage Vcc is powered using transformer assists winding.
As a kind of preferable technical scheme of the present invention, the second resistance is parallel with a filter capacitor C2.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention passes through the control power output circuit set up, energy
Enough solve the problems, such as it is traditional depend merely on chip controls precision and can not meet, output can be accurately controlled by this circuit design,
LED outputs are made to meet American Standard safety class2 standards, integrated circuit structure design is simple and practical, is easy to promote.
Brief description of the drawings
Fig. 1 is control output circuit schematic diagram of the present invention；
Fig. 2 is the loop circuit schematic diagram that the present invention connects；
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment：
Referring to Fig. 1, the present invention provides a kind of new power control output circuit, including operational amplifier U1, the first electricity
Hinder R1 and second resistance R2；The operational amplifier U1 is parallel with the resistance R5 and electric capacity C1 mutually concatenated；The first resistor R1
Partial pressure, which is carried out, with the burning voltage Vcc that second resistance R2 will acquire by connecting obtains A point magnitudes of voltage, the second resistance
R2 is grounded, and the A point magnitudes of voltage set input to operational amplifier U1 in-phase input end as power parameter, then by operation amplifier
Device U1 inverting input connection resistance R4 obtains the stable voltage Vb of a corresponding input current, by the way that the control is exported
The resistance R4 ends of circuit are connected with the B points in the loop circuit (as shown in Figure 2) of entirety, and operational amplifier U1 output is connected
Onto the control pin of chip controls service time size, the resistance value size of the resistance R3 in the loop circuit has depended on actual electricity
The power on road, because the stable voltage DC-BUS in the loop is fixed, thus the power in whole loop is exactly to pass through sampling resistor
Current average on R3 determines, ensures that A points are consistent with the voltage of B points by voltage regulator, and then it is right to stablize this
The purpose of firm power should be met in the electric current of power output；A filter capacitor can be parallel with second resistance in addition
C2, play a part of filtering clutter.
Based on above-mentioned, present invention has the advantage that：The present invention can be solved by the control power output circuit set up
Certainly traditional depends merely on the problem of chip controls precision can not meet, can be accurately controlled output by this circuit design, make LED
Output meets American Standard safety class2 standards, and integrated circuit structure design is simple and practical, is easy to promote.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (3)
- A kind of 1. new power control output circuit, it is characterised in that：Including operational amplifier U1, first resistor R1 and the second electricity Hinder R2；The operational amplifier U1 is parallel with the resistance R5 and electric capacity C1 mutually concatenated；The first resistor R1 and second resistance R2 leads to Cross series connection and the burning voltage Vcc acquired progress partial pressure is obtained into A point magnitudes of voltage, the second resistance R2 ground connection, A points electricity Pressure value sets input to operational amplifier U1 in-phase input end, then the anti-phase input by operational amplifier U1 as power parameter End connection resistance R4 obtains the stable voltage Vb of a corresponding input current.
- A kind of 2. new power control output circuit according to claim 1, it is characterised in that：Burning voltage Vcc is used Transformer assists winding is powered.
- A kind of 3. new power control output circuit according to claim 1, it is characterised in that：The second resistance is in parallel There is a filter capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711142999.3A CN107734782A (en) | 2017-11-17 | 2017-11-17 | A kind of new power control output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711142999.3A CN107734782A (en) | 2017-11-17 | 2017-11-17 | A kind of new power control output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107734782A true CN107734782A (en) | 2018-02-23 |
Family
ID=61217126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711142999.3A Pending CN107734782A (en) | 2017-11-17 | 2017-11-17 | A kind of new power control output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107734782A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201114917Y (en) * | 2007-08-04 | 2008-09-10 | 鹤山丽得电子实业有限公司 | A circuit for control load power |
| CN102130577A (en) * | 2010-12-31 | 2011-07-20 | 浙江大学 | Window control circuit for power factor correction circuit |
| US20110225435A1 (en) * | 2010-03-11 | 2011-09-15 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd | Power circuit |
| CN103441482A (en) * | 2013-08-01 | 2013-12-11 | 中国航天科技集团公司第九研究院第七七一研究所 | Current monitoring circuit with accurate current-limit function |
| CN205450860U (en) * | 2016-03-16 | 2016-08-10 | 深圳市比特原子科技有限公司 | Constant -current source circuit with adjustable it is small -size |
| CN106535418A (en) * | 2016-12-29 | 2017-03-22 | 重庆奥海辉龙大数据有限公司 | LED drive chip and drive circuit |
| CN107155232A (en) * | 2017-01-20 | 2017-09-12 | 福州大学 | A kind of High Power Factor LED constant current driving power supply and its control method |
| CN207518904U (en) * | 2017-11-17 | 2018-06-19 | 上海阿卡得电子有限公司 | A kind of new power control output circuit |
-
2017
- 2017-11-17 CN CN201711142999.3A patent/CN107734782A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201114917Y (en) * | 2007-08-04 | 2008-09-10 | 鹤山丽得电子实业有限公司 | A circuit for control load power |
| US20110225435A1 (en) * | 2010-03-11 | 2011-09-15 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd | Power circuit |
| CN102130577A (en) * | 2010-12-31 | 2011-07-20 | 浙江大学 | Window control circuit for power factor correction circuit |
| CN103441482A (en) * | 2013-08-01 | 2013-12-11 | 中国航天科技集团公司第九研究院第七七一研究所 | Current monitoring circuit with accurate current-limit function |
| CN205450860U (en) * | 2016-03-16 | 2016-08-10 | 深圳市比特原子科技有限公司 | Constant -current source circuit with adjustable it is small -size |
| CN106535418A (en) * | 2016-12-29 | 2017-03-22 | 重庆奥海辉龙大数据有限公司 | LED drive chip and drive circuit |
| CN107155232A (en) * | 2017-01-20 | 2017-09-12 | 福州大学 | A kind of High Power Factor LED constant current driving power supply and its control method |
| CN207518904U (en) * | 2017-11-17 | 2018-06-19 | 上海阿卡得电子有限公司 | A kind of new power control output circuit |
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