CN102105008A - Load current adjusting circuit - Google Patents
Load current adjusting circuit Download PDFInfo
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- CN102105008A CN102105008A CN2011100007261A CN201110000726A CN102105008A CN 102105008 A CN102105008 A CN 102105008A CN 2011100007261 A CN2011100007261 A CN 2011100007261A CN 201110000726 A CN201110000726 A CN 201110000726A CN 102105008 A CN102105008 A CN 102105008A
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- Prior art keywords
- load
- led
- circuit
- load current
- light emitting
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- 238000005070 sampling Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims description 27
- 230000001276 controlling effect Effects 0.000 claims description 9
- 230000005669 field effect Effects 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 5
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- ORKBYCQJWQBPFG-WOMZHKBXSA-N (8r,9s,10r,13s,14s,17r)-13-ethyl-17-ethynyl-17-hydroxy-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-3-one;(8r,9s,13s,14s,17r)-17-ethynyl-13-methyl-7,8,9,11,12,14,15,16-octahydro-6h-cyclopenta[a]phenanthrene-3,17-diol Chemical compound OC1=CC=C2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1.O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 ORKBYCQJWQBPFG-WOMZHKBXSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Abstract
The invention discloses a load current adjusting circuit matched with an LED electrifying light-emitting circuit (application number being 201010193525.3), wherein the load current adjusting circuit comprises a sampling control circuit, a switch device and a load; when the voltage of the commercial power supply rises or falls, the sampling control circuit controls the on or off of the switch device to increase or reduce the load of the LED electrifying light-emitting circuit, so that the load current of the LED electrifying light-emitting circuit is stable in the safe range.
Description
Technical field
The present invention relates to a kind ofly be used to throw light on or the load current regulating circuit of the LED electrified light emitting circuit that information shows.
Background technology
In the prior art, LED electrified light emitting circuit (application number 201010193525.3) adopts the mains supply LED load of directly powering, and it should be noted that the regional mains voltage fluctuation of condition of power supply difference is big, make the fluctuation of LED load current big, influence the useful life of LED load.
Summary of the invention
At the big reality of mains voltage fluctuation, the purpose of this invention is to provide a kind of load current regulating circuit, described load current regulating circuit and this LED electrified light emitting circuit are used, thereby described load current regulating circuit can make the load increase or the minimizing of this LED electrified light emitting circuit that the LED load current of this LED electrified light emitting circuit is stabilized in the safe range when mains voltage raises or reduce.
To achieve these goals, technical scheme of the present invention is: a kind of load current regulating circuit, comprise controlling of sampling circuit, switching device and load, thus when mains voltage raises or reduce the controlling of sampling circuit from mains supply adopt sampled voltage and control switch device by or conducting make the load of this LED electrified light emitting circuit increase or reduce.
Compared with prior art, when mains voltage raises or reduce, thus controlling of sampling circuit of the present invention can from mains supply adopt sampled voltage and control switch device by or conducting make the load of this LED electrified light emitting circuit increase or reduce and guarantee that the LED load current of this LED electrified light emitting circuit is stabilized within the safe range.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the circuit diagram of the embodiment of the invention one.
Fig. 2 is the circuit diagram of the embodiment of the invention two.
Embodiment
The load current regulating circuit of embodiment one comprises controlling of sampling circuit, switching device and load.See also Fig. 1, described load current regulating circuit and this LED electrified light emitting circuit (application number 201010193525.3) are used, and this LED electrified light emitting circuit comprises power supply V
CC, K switch, resistance R
11, R
12, R
13, photoelectrical coupler 2, switching device VS, LED load 5 and bridge rectifier 4D, the one-way LED load that LED load 5 forward is connected in series and is formed by N LED, mains supply U
1Through bridge rectifier 4D output dc voltage U
2Described controlling of sampling circuit is by resistance R
1, R
2, R
3, R
4, R
5, capacitor C
1, C
2, field effect transistor VT
1Form, described switching device is VT
2The optional power MOSFET of using, described load can select for use LED or resistance to be referred to as load 7, resistance R
1, R
2Be connected in series (the serial connection point is A) back cross-over connection in U
2Positive and negative two ends, resistance R
3, R
4, R
5Be connected in series (the serial connection point is B, C) back cross-over connection in U
2Positive and negative two ends, for example set U
1=226V is a high-value, U
1When=214V is low-value, resistance R
1, R
2Value should guarantee to work as U
1The voltage U of sampling point A during=226V
AEqual VT
1Conducting valve threshold voltage V
GS(th), R
3, R
4, R
5Value should guarantee to work as VT
1B point voltage U when being in cut-off state
BLess than VT
1V
DSLimiting value guarantees C point voltage U again
CGreater than VT
2The conducting valve threshold voltage by VT
2Fully conducting, C
1With R
2Be connected in parallel C
2With R
5Be connected in parallel field effect transistor VT
1Grid G be connected with the A point, drain D is connected source S and U with the B point
2Negative terminal to connect tie point be E, field effect transistor is a voltage control device, above-mentioned resistance can be with the big small-power resistance of resistance, VT
1Can select for example 2N7000 of low power tube for use, the anode of load 7 is connected tie point with the negative terminal of the LED load 5 of this LED electrified light emitting circuit be that the negative terminal of F, load 7 is connected VT with the E point
2Grid G be connected with the C point, source S is connected with the E point, drain D is connected VT with the F point
2Should select LED load current, the conducting resistance R of drain current rated value for use greater than this LED electrified light emitting circuit
DS(ON) the smaller the better, for example optional 2SK1286.Work as voltage U
1U during＜226V
ALess than VT
1The conducting valve threshold voltage make VT
1Be in cut-off state and VT
2Be in abundant conducting state with load 7 short circuits, the LED load current of LED electrified light emitting circuit is through VT
2The circulation of leakage, source electrode, V
DSThe minimum null value that is approximately does not have influence to the LED electrified light emitting circuit, works as U
1During＞226V, sampled voltage U
AGreater than VT
1Threshold voltage make VT
1Conducting is U then
BReduce greatly and make VT
2Be in cut-off state, the LED load current of this LED electrified light emitting circuit flows to U through LED load 5 and load 7
2Negative terminal, this moment, the load of LED electrified light emitting circuit increased to load 5+7 by original load 5, made the load current of LED electrified light emitting circuit be stabilized in safe range.For example the LED load 5 as if the LED electrified light emitting circuit is LED illuminating lamps of 110W, U
1Its load current is 0.5A during=220V, if the resistance of 12 Ω is selected in load 7 for use, then works as U
1The voltage drop of load 7 is about 0.5A * 12 Ω=6V during=226V, can think that load 7 born 6V, and voltage, the electric current that the LED load 5 of this LED electrified light emitting circuit is born remains the safe range of 220V, 0.5A.This paper is above-mentioned U
1The adjusting of＞226V high-value abbreviates " the high-order adjusting " as, correspondingly the high-order load current regulating circuit of regulating of above-mentioned enforcement is abbreviated as " high-order regulating circuit ".Correspondingly this paper is U
1Adjusting during＜214V low-value abbreviates " low level adjusting " as, and the load current regulating circuit of implementing " low level adjusting " is abbreviated as " low level regulating circuit ", sees also Fig. 1, and the controlling of sampling circuit of described low level regulating circuit is by resistance R
6, R
7, R
8, R
9, R
10, capacitor C
3, C
4, field effect transistor VT
3Form, described switching device is VT
4, described load is that the negative terminal from the LED load 5 of LED electrified light emitting circuit takes a morsel several LED as the load 3 of low level regulating circuit, the anode of load 3 is F
1, negative terminal is F, resistance R
6, R
7, R
8, R
9, R
10, capacitor C
3, C
4, field effect VT
3, switching device VT
4Option, value all the same with high-order regulating circuit, work as U
1Sampled voltage U during＞214V
HGreater than VT
3The conducting valve threshold voltage make VT
3Be in conducting state, U
JReduce K point voltage U greatly
KLess than VT
4Conducting valve threshold voltage VT
4Be in cut-off state, the LED load 5 of LED electrified light emitting circuit is had no effect, work as U
1U during＜214V
HLess than VT
3The conducting valve threshold voltage make VT
3End U
KGreater than VT
4The conducting valve threshold voltage make VT
4Being in abundant conducting state makes the load of this LED electrified light emitting circuit become 5-3 from original load 5 load 3 short circuits, load reduces makes the LED load current of LED electrified light emitting circuit be stabilized in normal range (NR), for example if the rated voltage of every LED of LED load 5 is 3.1V, can get two LED as load 3, work as U
1During=220V in the LED load 5 every LED pipe can obtain the operating voltage of 3.1V, work as U
1During＜214V among the LED load 5-3 every LED pipe also can obtain the operating voltage of 3.1V, the operating current of LED load is stabilized within the normal range (NR).As seen comprehensive above-mentioned: it all is described load current regulating circuit that high-order adjusting is regulated with low level, and common working method is all arranged, promptly as mains supply U
1Regulating circuit was failure to actuate this LED electrified light emitting circuit and load thereof is not influenced yet not power consumption substantially when voltage was stabilized within the safe range of 220V and permission, just thought U
1Just implementing to regulate greater than safety value or when being lower than normal value, all is a step level formula regulative mode, and the step level of given example is 6V, and the power supply quality of neglecting mains supply greatly of step level and regulating requires and decides.
The load current regulating circuit of embodiment two comprises controlling of sampling circuit, switching device and load.See also Fig. 2, in the area of condition of power supply difference or to require the better occasion of regulating effect can adopt the regulative mode of multistep level, this example be the high-order regulating circuits of two step levels, setting first step level high-value is U
1=225V, the second step level high-value is U
1=230V, the high-order regulating circuit of first step level is by resistance R
1, R
2, R
3, R
4, R
5, capacitor C
1, C
2, field effect transistor VT
1, switching device VT
2, load 7 forms, the high-order regulating circuit of the second step level is by resistance R
6, R
7, R
8, R
9, R
10, capacitor C
3, C
4, field effect transistor VT
3, switching device VT
4, load 8 forms, the option of circuit, value and embodiment together, as power supply U
1VT during＜225V
1, VT
3All be in cut-off state, VT
2, VT
4All be in abundant conducting state with load 7 and load 8 short circuits, the LED electrified light emitting circuit is had no effect, work as U
1VT during greater than 225V and less than 230V
1Conducting and VT
3End, make VT
2End and VT
4Conducting is load 8 short circuits, and this moment, the switch on load of electric Power Generation Road of this LED was 5+7, and load has increased, and implemented that first step level is high-order regulates, and works as U
1VT during＞230V
1, VT
3All conductings make VT
2, VT
4All end, the result is that to make the load of this LED electrified light emitting circuit be that 5+8+7 has implemented second the step level is high-order to regulate.Also can adopt a more multistage high position to regulate if necessary, same, low level is regulated and also can be adopted multistage low level to regulate.
Claims (1)
1. load current regulating circuit and LED electrified light emitting circuit (application number 201010193525.3) are used, it is characterized in that: described load current regulating circuit comprises controlling of sampling circuit, switching device and load, thus when mains voltage raises or reduce controlling of sampling circuit controling switch device by or conducting make the load of this LED electrified light emitting circuit increase or reduce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100007261A CN102105008A (en) | 2011-01-04 | 2011-01-04 | Load current adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100007261A CN102105008A (en) | 2011-01-04 | 2011-01-04 | Load current adjusting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102105008A true CN102105008A (en) | 2011-06-22 |
Family
ID=44157443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100007261A Pending CN102105008A (en) | 2011-01-04 | 2011-01-04 | Load current adjusting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102105008A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102800298A (en) * | 2012-09-11 | 2012-11-28 | 深圳市华星光电技术有限公司 | Light-emitting diode (LED) backlight driving circuit and LED backlight driving method |
| CN103257663A (en) * | 2012-02-15 | 2013-08-21 | 杜邦太阳能有限公司 | Current regulating circuit and circuit system with same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
| US20100194298A1 (en) * | 2008-10-30 | 2010-08-05 | Fuji Electric Systems Co., Ltd. | Led drive device, led drive method and lighting system |
-
2011
- 2011-01-04 CN CN2011100007261A patent/CN102105008A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101137261A (en) * | 2006-08-29 | 2008-03-05 | 安华高科技Ecbuip(新加坡)私人有限公司 | Device and method for driving LED |
| US20100194298A1 (en) * | 2008-10-30 | 2010-08-05 | Fuji Electric Systems Co., Ltd. | Led drive device, led drive method and lighting system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257663A (en) * | 2012-02-15 | 2013-08-21 | 杜邦太阳能有限公司 | Current regulating circuit and circuit system with same |
| CN102800298A (en) * | 2012-09-11 | 2012-11-28 | 深圳市华星光电技术有限公司 | Light-emitting diode (LED) backlight driving circuit and LED backlight driving method |
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| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Luo Hongji Document name: Notification of Passing Examination on Formalities |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: Luo Hongji Document name: the First Notification of an Office Action |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110622 |