CN101261526A - Enhancement type voltage regulation constant-current device and constant current source constituted by same - Google Patents
Enhancement type voltage regulation constant-current device and constant current source constituted by same Download PDFInfo
- Publication number
- CN101261526A CN101261526A CNA2008100361697A CN200810036169A CN101261526A CN 101261526 A CN101261526 A CN 101261526A CN A2008100361697 A CNA2008100361697 A CN A2008100361697A CN 200810036169 A CN200810036169 A CN 200810036169A CN 101261526 A CN101261526 A CN 101261526A
- Authority
- CN
- China
- Prior art keywords
- constant
- voltage
- constant current
- current device
- current
- 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
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention relates to an enhanced voltage regulation constant current device and a constant current power supply which is constituted thereby, the voltage regulation constant current device comprises an input end and an output end, which is characterized in that a shunt resistance is electrically connected between the input end and the output end. As the enhanced voltage regulation constant current device and the constant current power supply of the invention reduce the power consumption of the voltage regulation constant current device, the enhanced voltage regulation constant current device and the constant current power supply have the advantages of great constant current and/or wide voltage regulation range and so on.
Description
Technical field
The present invention relates to the constant-current supply of voltage-regulation constant current device and formation thereof, be specifically related to the constant-current supply that enhancement mode voltage is regulated constant current device and formation thereof.
Background technology
In the prior art, the voltage-regulation constant current device, for example LM117, LM317, LM388 etc., because the constant-current supply of its formation is lower than the cost of switching device, thereby often be used to constitute constant-current supply, the constant current power supply is carried out in the load that needs the constant current power supply such as light emitting diode or light-emitting diode group etc.So-called " constant current power supply " be meant under impressed voltage (supply voltage) situation of change, the electric current by load remain unchanged (" constant " here be meant the variation of load current compare and can not consider or ignore with the variation of impressed voltage).Though this voltage-regulation constant current device has the high advantage of efficient, there is the little shortcoming of electric current of constant current power supply under the device maximum power dissipation in the constant-current supply of its formation.That is to say, in order to increase electric current, must make that the maximum power dissipation of voltage-regulation constant current device is big, so just improved the cost of manufacture and the volume that has increased device of device, or make the voltage-regulation scope of constant-current supply reduce, cause the variation range of constant-current supply adaptation impressed voltage little.
Summary of the invention
The present invention is in order to address the above problem, and its purpose is to provide a kind of enhancement mode voltage that can improve continuous current and/or voltage-regulation wide ranges to regulate the constant-current supply of constant current device and formation thereof.
Enhancement mode voltage of the present invention is regulated constant current device, comprises the voltage-regulation constant current device of input end and output terminal, it is characterized in that, is electrically connected with shunt resistance between described input end and output terminal.
Constant-current supply of the present invention comprises the voltage-regulation constant current device, and this voltage-regulation constant current device comprises input end and output terminal, it is characterized in that, is electrically connected with shunt resistance between described input end and described output terminal.
Regulate constant current device and constant-current supply according to the enhancement mode voltage of the present invention of above-mentioned formation and have advantages such as the big and/or voltage-regulation wide ranges of continuous current.
Description of drawings
Fig. 1 regulates the electrical schematic diagram of the constant-current supply of constant current device and formation thereof for showing one embodiment of the invention enhancement mode voltage.
Embodiment
The enhancement mode voltage that Fig. 1 shows one embodiment of the invention is regulated the electrical schematic diagram of the constant-current supply of constant current device and formation thereof.In Fig. 1, except shunt resistance R
fOutward, remainder be in the prior art with voltage-regulation constant current device 4, for example LM117, LM317, LM388 etc., formation to load 5, light emitting diode for example carries out the typical case of electrical schematic diagram of the constant-current supply of constant current power supply.The formation of the constant-current supply of this prior art is a core with voltage-regulation constant current device 4, and voltage-regulation constant current device 4 comprises feedback end (sampling end) 3, input end 1 and output terminal 2, is electrically connected with the constant current resistance R between feedback end 3 and output terminal 2
bThis constant-current supply is at impressed voltage (supply voltage) V
DWhen work is carried out in power supply, in voltage source V
DAn end, anode for example, and be electrically connected with load 5 between the input end, for example light emitting diode or light-emitting diode group, voltage source V
DThe other end be electrically connected on feedback end 3.The characteristics of this constant current device 4 are impressed voltage (supply voltage) V
DWhen changing within the specific limits, the voltage V between feedback end 3 and the output terminal 2
32Keep constant substantially, thereby flow through the constant current resistance R
bElectric current I
ModAlso constant, i.e. I
ModIt is continuous current.The load current I of the above-mentioned existing constant-current supply that constitutes as voltage-regulation constant current device 4
LedOwing to equal electric current I
Mod, thereby load 5 has obtained the constant current power supply, supply voltage V
DVariation dropped between the input end 1 and output terminal 2 of voltage-regulation constant current device 4.
Improvements of the present invention are, are electrically connected with shunt resistance R between the input end 1 of existing voltage-regulation constant current device 4 and output terminal 2
fRegulate constant current device to constitute enhancement mode voltage of the present invention, and regulate the constant-current supply of the present invention that constant current device constitutes as this enhancement mode voltage of the illustrative usefulness of Fig. 1.Enhancement mode voltage of the present invention is regulated the constant-current supply of constant current device and formation thereof, because parallel connection is electrically connected with shunt resistance R on the input end 1 of existing voltage-regulation constant current device 4 and output terminal 2 two ends
f, to load current I
LedShunt, thereby the input end 1 of the voltage-regulation constant current device 4 of flowing through and the electric current of output terminal 2 are reduced, reduced the power attenuation of voltage-regulation constant current device 4 like this, or under the constant situation of the power attenuation of voltage-regulation constant current device 4, increased load current I to the constant current power supply of load 5
Led
As the variation example of the foregoing description, wherein shunt resistance R
fIt can be the combination of linear resistance, non-linear resistance or linear resistance and non-linear resistance.Shunt resistance R
fCan be electrically connected with voltage-regulation constant current device 4 in discrete mode, also can integrate with voltage-regulation constant current device 4.In the above-described embodiments, though shunt resistance R
fDirectly be connected electrically between input end 1 and the output terminal 2, but also should comprise for other function needs such as test, control and shunt resistance R
fThe various variation electric connection mode of series and parallel such as electron devices such as sensing, switch.The constant current resistance R
bThough directly be connected electrically between feedback end 3 and the output terminal 2, also should comprise as above shunt resistance R
fVarious variation electric connection mode.Though the load 5 in the foregoing description is light emitting diodes, also can be the light-emitting diode group that a plurality of light emitting diodes constitute by various series and parallel modes, or outer other load that needs the constant current power supply of light emitting diode.In the above-described embodiments, though supply voltage V
DThe anode end and the negative terminal that are connected in load be connected in feedback end, but the positive and negative end of supply voltage also can be done opposite connection, this depends on the design of the power supply polarity needs of voltage-regulation constant current device 4 internal integrated circuits.
As shunt resistance R
fWhen directly being connected electrically between input end 1 and the output terminal 2, the maximum power dissipation of voltage-regulation constant current device 4 (power attenuation) P
Max, load current I
LedWith shunt resistance R
fBetween relational expression derive as follows.
If the voltage between input end 1 and the output terminal 2 is V
x, shunt resistance R then flows through
fElectric current be V
x/ R
f, the power consumption of voltage-regulation constant current device 4 (power attenuation) P
xFor:
P
x＝(I
led-V
x/R
f)V
x
＝I
ledV
x-V
x 2/R
f
With P
xTo V
xDifferentiate obtains
P
x’＝I
led-2V
x/R
f
Make p
x'=0, the maximum power dissipation point that obtains voltage-regulation constant current device 4 is:
V
x=R
fI
Led/ 2, flow through this moment input of voltage-regulation constant current device 4, the electric current I of output terminal (1,2)
xWith the shunt resistance R that flows through
fElectric current I
fAll be I
Led/ 2, therefore, the maximum power dissipation P of the voltage-regulation constant current device 4 on this maximum power dissipation point
mFor:
P
m＝V
xI
x＝(R
f?I
led/2)(I
led/2)
＝R
fI
led 2/4 ——(1)
Make P
m≤ P
Max, then obtain P
Max, I
Led, and R
fRelational expression (2) be:
R
f≤4P
max/I
led 2 ——(2)
From formula (2) as seen, shunt resistance R
fCan be according to the maximum power dissipation P of voltage-regulation constant current device 4
MaxWith load current I
LedCalculate.
Below in conjunction with top analysis, quantitative comparison the present invention is with respect to the contribution of prior art.
At first determining the maximum voltage range of adjustment (being the change in voltage scope between input end 1 and the output terminal 2) of voltage-regulation constant current device 4 in the constant-current supply of the present invention, also is the maximum voltage variation range of Constant Electric Current potential source.For the operate as normal (guaranteeing that promptly the polarity of voltage that is applied between input end 1 and the output terminal 2 does not reverse) that guarantees voltage-regulation constant current device 4, then get the lower limit V of this maximum voltage range of adjustment
1〉=0; For the operate as normal that the guarantees voltage-regulation constant current device 4 (electric current I of promptly guarantee under maximum voltage is regulated, to flow through input end 1 and output terminal 2
x〉=0), then gets the upper limit V of this maximum voltage range of adjustment
h≤ I
LedR
fThis shows that the maximum voltage range of adjustment of voltage-regulation constant current device 4 is I in the constant-current supply of the present invention
LedR
f〉=V
x〉=0.
The constant-current supply of prior art is promptly removed shunt resistance R among Fig. 1
fOuter part, the maximum power dissipation point V of the voltage-regulation constant current device 4 in this part
x' should occur in the upper limit V of above-mentioned maximum voltage range of adjustment
h, i.e. V
x'=V
h, the electric current I of flow through this moment input end 1 and output terminal 2
x'=I
Led, so the maximum power dissipation P of voltage-regulation constant current device 4
m'=V
x' I
Led=V
hI
Led=I
LedR
fI
Led=R
fI
Led 2
From above-mentioned formula (1) as seen, constant-current supply of the present invention (comprises shunt resistance R among Fig. 1
fIn interior part) in the maximum power dissipation P of voltage-regulation constant current device 4
m=R
fI
Led 2/ 4.Compare with above-mentioned prior art, as seen under the situation of identical voltage-regulation scope of both voltage-regulation constant current device 4 carryings and identical load current, voltage-regulation constant current device 4 maximum power dissipation P in the present invention
mBe equivalent to maximum power dissipation P in the prior art
m' 1/4th, that is to say that the maximum power dissipation that the voltage-regulation constant current device 4 in the prior art constant-current supply is carried is four times of the maximum power dissipation of being carried of the voltage-regulation constant current device 4 in the constant-current supply of the present invention.In other words, form constant-current supply of the present invention with the voltage-regulation constant current device that maximum power dissipation is identical, under the constant situation of voltage-regulation scope, can provide maximum Constant Current Load electric current to four times, or load current can provide maximum voltage-regulation scope (mains voltage variations scope) to four times when identical.
Below in conjunction with the accompanying drawings the present invention is had been described in detail, those skilled in the art are according to design of the present invention that instructions disclosed, also can make other various variation examples except that the variation exception of describing in the instructions, therefore described embodiment of this instructions and variation example thereof should not constitute limitation of the invention, and should be limited the present invention with the appended claims that embodies the present invention's design.
Claims (10)
1, a kind of enhancement mode voltage is regulated constant current device, comprises the voltage-regulation constant current device of input end and output terminal, it is characterized in that, is electrically connected with shunt resistance between described input end and output terminal.
2, enhancement mode voltage as claimed in claim 1 is regulated constant current device, it is characterized in that described shunt resistance directly is connected electrically between described input end and the output terminal.
3, enhancement mode voltage as claimed in claim 2 is regulated constant current device, it is characterized in that, satisfy following relational expression between the load current of described enhancement mode voltage adjusting constant current device, the maximum power dissipation of described voltage-regulation constant current device and the described shunt resistance three
R
f≤4P
max/I
led
Wherein, R
fBe described shunt resistance; P
MaxBe described maximum power dissipation; I
LedBe described load current.
4, a kind of constant-current supply comprises the voltage-regulation constant current device, and this voltage-regulation constant current device comprises input end and output terminal, it is characterized in that, is electrically connected with shunt resistance between described input end and described output terminal.
5, constant-current supply as claimed in claim 4 is characterized in that, described shunt resistance directly is connected electrically between described input end and the described output terminal.
6, constant-current supply as claimed in claim 5 is characterized in that, satisfies following relational expression between the maximum power dissipation of the load current of described constant-current supply, described voltage-regulation constant current device and the described shunt resistance three
R
f≤4P
max/I
led
Wherein, R
fBe described shunt resistance; P
MaxBe described maximum power dissipation; I
LedBe described load current.
7, as the described constant-current supply of the arbitrary claim of claim 4 to 6, it is characterized in that, described voltage-regulation constant current device also comprises feedback end, between described feedback end and described output terminal, be electrically connected with constant current resistance, when described constant-current supply is worked, be electrically connected with load between end of a voltage source and described input end, the other end of described voltage source is electrically connected on described feedback end.
8, constant-current supply as claimed in claim 7 is characterized in that, described load directly is connected electrically between the end and described input end of described voltage source.
9, constant-current supply as claimed in claim 8 is characterized in that, described constant current resistance directly is connected electrically between described feedback end and the described output terminal.
10, constant-current supply as claimed in claim 9 is characterized in that, described load is a light emitting diode or light-emitting diode group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100361697A CN101261526A (en) | 2008-04-17 | 2008-04-17 | Enhancement type voltage regulation constant-current device and constant current source constituted by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100361697A CN101261526A (en) | 2008-04-17 | 2008-04-17 | Enhancement type voltage regulation constant-current device and constant current source constituted by same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101261526A true CN101261526A (en) | 2008-09-10 |
Family
ID=39962015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100361697A Pending CN101261526A (en) | 2008-04-17 | 2008-04-17 | Enhancement type voltage regulation constant-current device and constant current source constituted by same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101261526A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163066A (en) * | 2010-02-16 | 2011-08-24 | 杨泰和 | Current regulator drive circuit shunting current through voltage-dividing load |
| CN102682721A (en) * | 2012-06-05 | 2012-09-19 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight system and display device |
| CN103257662A (en) * | 2012-03-14 | 2013-08-21 | 美芯晟科技（北京）有限公司 | Linear constant-current modulation circuit |
| CN105517252A (en) * | 2016-01-26 | 2016-04-20 | 浙江富春照明电器有限公司 | Self-operation charging illumination lamp drive circuit |
| CN106502295A (en) * | 2016-11-05 | 2017-03-15 | 上海大学 | A kind of Constant Current Control System |
-
2008
- 2008-04-17 CN CNA2008100361697A patent/CN101261526A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163066A (en) * | 2010-02-16 | 2011-08-24 | 杨泰和 | Current regulator drive circuit shunting current through voltage-dividing load |
| CN102163066B (en) * | 2010-02-16 | 2015-07-15 | 杨泰和 | Current regulator drive circuit shunting current through voltage-dividing load |
| CN103257662A (en) * | 2012-03-14 | 2013-08-21 | 美芯晟科技（北京）有限公司 | Linear constant-current modulation circuit |
| CN103257662B (en) * | 2012-03-14 | 2014-12-24 | 美芯晟科技（北京）有限公司 | Linear constant-current modulation circuit |
| CN102682721A (en) * | 2012-06-05 | 2012-09-19 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight system and display device |
| CN102682721B (en) * | 2012-06-05 | 2014-10-29 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight system and display device |
| CN105517252A (en) * | 2016-01-26 | 2016-04-20 | 浙江富春照明电器有限公司 | Self-operation charging illumination lamp drive circuit |
| CN106502295A (en) * | 2016-11-05 | 2017-03-15 | 上海大学 | A kind of Constant Current Control System |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102563400B (en) | Double-end current controller and related light emitting diode lighting device | |
| TWI425862B (en) | Two-terminal current controller and related led lighting device | |
| US9223334B2 (en) | Constant current circuit and light emitting diode driving device using the same | |
| CN103531156B (en) | Backlight drive circuit and liquid crystal indicator | |
| KR101198395B1 (en) | Led lighting driving circuit | |
| US8193733B2 (en) | LED driver circuit | |
| TW201422050A (en) | DC core circuit of LED driver circuit | |
| KR101503874B1 (en) | Light emitting diode driver circuit and lighting apparutus having the same | |
| US10517151B1 (en) | Linear constant-current LED light circuit | |
| US20120146596A1 (en) | Voltage converter | |
| CN101261526A (en) | Enhancement type voltage regulation constant-current device and constant current source constituted by same | |
| CN100505506C (en) | Power supply for positive and negative output voltages | |
| CN104768303B (en) | LED drive control circuits | |
| CN104470096B (en) | LED driving circuit | |
| CN103440011B (en) | Linear constant-current-source circuit having voltage difference compensation | |
| CN104470095B (en) | Ripple rejection LED drive circuit | |
| TW201037213A (en) | Light-emitting device | |
| US20140132182A1 (en) | Feedback circuit for non-isolated power converter | |
| US20140327365A1 (en) | A constant current source circuit and a sampling circuit | |
| Yu et al. | A high power factor AC LED driver with current glitch eliminated | |
| US9585219B2 (en) | Light emitting element driving apparatus | |
| TWI717898B (en) | Power conversion device | |
| CN102420525A (en) | Circuit for improving multi-path output cross regulation rate of switching power supply | |
| CN102622957B (en) | Multichannel LED constant current source driving circuit based on MOSFET of linear region with constant grid voltage | |
| TWI441141B (en) | Current control stages, constant current control systems, and current control methods |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wujiang William Photoelectric Technology Co., Ltd. Assignor: Shanghai William's Lighting Co., Ltd. Contract fulfillment period: 2009.3.18 to 2015.3.17 contract change Contract record no.: 2009990000216 Denomination of invention: Enhancement type voltage regulation constant-current device and constant current source constituted by same License type: Exclusive license Record date: 2009.3.25 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.3.18 TO 2015.3.17; CHANGE OF CONTRACT Name of requester: WUJIANG WEILIAN OPTOELECTRONIC TECHNOLOGY CO., LTD Effective date: 20090325 |
|
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20080910 |