CN104968103A - Resistance current repressing circuit used for LED sectional drive - Google Patents
Resistance current repressing circuit used for LED sectional drive Download PDFInfo
- Publication number
- CN104968103A CN104968103A CN201510363492.5A CN201510363492A CN104968103A CN 104968103 A CN104968103 A CN 104968103A CN 201510363492 A CN201510363492 A CN 201510363492A CN 104968103 A CN104968103 A CN 104968103A
- Authority
- CN
- China
- Prior art keywords
- led
- current
- circuit
- resistance
- oxide
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The invention provides a resistance current repressing circuit used for LED sectional drive. The circuit comprises a series connection topology structure. The series connection topology structure comprises one or a plurality of series connection driving modules. Each series connection driving module comprises an MOS tube and an LED string. The MOS tube and the LED string are in series connection. A current repressing device is connected between the source electrode of the MOS tube and a system ground. The current repressing device is in series connection with a current loop. When an LED load current increase, the MOS effective grid electrode voltage is lowered through increase of the voltage of the current repressing device, and the LED current is limited. The resistance current repressing circuit has characteristics of rapid circuit response speed, strong surge-resistant capability, stable LED current, good silicon controlled rectifier light modulation compatibility, and low cost.
Description
Technical field
The present invention relates to LED (light-emitting diode) lighting field, particularly a kind of resistance for LED drive part by part holds back current circuit.
Background technology
LED chip is efficient with it, high integration, and the high life is used widely in novel energy-conserving light source field.In LED light source, power drives is more crucial technology.Due to the high integration applied LED and low cost requirement, the share that the LED drive scheme of the energy storage devices such as non-inductance electric heating appearance accounts in the market is increasing, has irreplaceable advantage in the application scenario of high integration.In such drive scheme, control IC is by regulating to the grid voltage of LED channel selector metal-oxide-semiconductor the quantity controlling the LED of actual On current process, to make up the On current that causes because LED is non-linear to the tetchiness of input voltage, thus reach current limliting object.In a typical apply of Fig. 1, a control IC controls the conducting of four sections of LED strings.Control IC regulates actual loading by regulating the conducting of these four metal-oxide-semiconductors of M1 to M4.When input voltage is less time, M1 conducting, electric current is only by first paragraph LED string, and when input voltage increases time, M1 resistance increases gradually, to reach current limliting object.When input voltage is enough high, M1 opens completely, and electric current is by second segment lamp string.When input voltage continues to increase, M2 resistance increases gradually, by that analogy.At the control chip of existing market application, when input voltage is within the scope of the unlatching of certain section of lamp string time, control IC adopts current constant control.Fig. 2 is the IV curve of such chip typical.Can find out that such controls the equivalent load characteristic driven from this curve.When voltage increases gradually, load current presents a stepped ramp type curve.In the interval that certain a string LED chip is lighted, load current keeps constant.The concrete shape of step is depending on the quantity of each LED chip string, and same chip can have different settings.What Fig. 3 showed is when being input as alternating voltage, and electric current is change curve in time.When change in voltage, the change of load current presents discontinuous step.Therefrom we can find out the discontinuous characteristic of electric current.
Although traditional current feedback circuit effectively solves the nonlinear problem of LED load, achieving the optical drive engine that can accept alternating current and directly input, still there are some problems in such driving.Mainly contain following problem:
1, the response time is slow.Circuit limits the frequency bandwidth of the response time of high frequency voltage pulse by current feedback circuit.The slower response time causes circuit, under high frequency surge voltage, LED there will be of short duration heavy current pulse.These pulses can puncture LED, cause circuit anti surge voltage ability to decline, need the protection of peripheral circuit.
2, during input voltage change, LED current is unstable.Due to the limitation of the feedback mechanism of current feedback circuit, when input voltage changes, circuit is difficult to ensure that LED current is stablized, and thus can produce LED " ghost dodges " (shimmering) effect.
3, circuit complexity.In order to realize good current feedback performance and higher responsive bandwidth, complexity and the power consumption of electronic feedback circuit increase all to some extent.
4 and not the mating of some TRIAC lighting network control.This problem is a relatively serious in the application problem.Due to silicon controlled on state characteristic, and the load of controllable silicon compatibility must ensure under any input voltage, have a so-called leakage current (bleeding) being greater than controllable silicon maintenance electric current.In traditional design, this leakage current needs special circuit to control, to ensure to maintain current requirements and the system effectiveness when large voltage inputs simultaneously.These two requirements of this lot of occasion are conflicting.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of resistance for LED drive part by part and holds back current circuit, improves circuit corresponding speed, and LED current is stablized.
In order to solve the problems of the technologies described above, the invention provides a kind of resistance for LED drive part by part and hold back current circuit, comprise series topology structure, described series topology structure comprises one or more tandem drive module, described tandem drive module comprises metal-oxide-semiconductor and LED strip, and described metal-oxide-semiconductor and LED strip are for being connected in series;
Described metal-oxide-semiconductor source electrode and systematically between access one hold back stream device, described in hold back stream device and connect with current circuit, when LED load electric current increases, flow voltage increase on device reduce the effective grid voltage of MOS by holding back, limit LED current.
Preferably,
Described stream device of holding back is for holding back leakage resistance or diode.
Preferably,
Also comprise coupling circuit, described coupling circuit comprises: arrange a metal-oxide-semiconductor M0 in described multiple tandem drive module front end, at metal-oxide-semiconductor M0 grid butt coupling electric capacity; When input has pulse surge voltage, open M0 by described coupling circuit and to release surge voltage, protective circuit.
Preferably,
Also comprise control IC, described control IC adds different grid voltage on different metal-oxide-semiconductor, realizes the LED segmentation conducting when different input voltage.
Preferably, described tandem drive module is 4.
Preferably, described metal-oxide-semiconductor and control IC are separated.
Control to compare with conventional constant current, the present invention has following advantage in result of use:
1, Circuit responce speed is fast.It is real-time that resistance holds back stream feedback, can not produce the current spikes because circuit response time causes slowly.
2, strong to surge resistivity.Because circuit responds fast, surge can not be caused to puncture LED. and surge voltage leadage circuit can be integrated in first order metal-oxide-semiconductor simultaneously.
3, LED current is stablized.The Shimmering that input voltage fluctuation can not cause LED current fluctuation to produce.Hold back leakage resistance and current circuit series connection with one, when LED load electric current increases, the mode reducing the effective grid voltage of MOS by holding back voltage increase on leakage resistance limits LED current, reaches steady flow result.
4 and controllable silicon light modulation compatibility good.The present invention can be easy to design larger leakage current circuit, with better and controllable silicon compatibility.
5, cost is low.Present invention, avoiding the design of high-performance feedback amplifier, chip area reduces.
Accompanying drawing explanation
Fig. 1 is a typical segmentation LED drive circuit.
Fig. 2 is the LED load electric current of circuit as shown in Figure 1 and the function curve diagram of input voltage.
Fig. 3 is that the resistance for LED drive part by part of one embodiment of the invention holds back current circuit schematic diagram.
Fig. 4 is that the resistance for LED drive part by part of another embodiment of the present invention holds back current circuit schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of all.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Main thought of the present invention is the mechanism (Algorithm) proposing a kind of new Current Feedback Control, and its main points are, current limliting metal-oxide-semiconductor adopts floating source structure, metal-oxide-semiconductor source electrode and systematically between access one hold back leakage resistance.
With reference to shown in Fig. 3, the resistance for LED drive part by part for one embodiment of the invention holds back current circuit schematic diagram.
Described circuit comprises series topology structure, and described series topology structure comprises one or more tandem drive module, and described tandem drive module comprises metal-oxide-semiconductor and LED strip, and described metal-oxide-semiconductor and LED strip are for being connected in series; Described metal-oxide-semiconductor source electrode and systematically between access one hold back stream device, described in hold back stream device and connect with current circuit, when LED load electric current increases, flow voltage increase on device reduce the effective grid voltage of MOS by holding back, limit LED current.
In a preferred embodiment of the invention, stream device is held back described in for holding back leakage resistance or diode.
In a preferred embodiment of the invention, also comprise coupling circuit, described coupling circuit comprises: arrange a metal-oxide-semiconductor M0 in described multiple tandem drive module front end, at metal-oxide-semiconductor M0 grid butt coupling electric capacity; When input has pulse surge voltage, open M0 by described coupling circuit and to release surge voltage, protective circuit.
The embodiment of the present invention also comprises control IC, and described control IC adds different grid voltage on different metal-oxide-semiconductor, realizes the LED segmentation conducting when different input voltage.Described tandem drive module can be 4, and certain described tandem drive module also can be other number, and the present invention is not limited this.
Control IC regulates actual loading by regulating the conducting of these four metal-oxide-semiconductors of M1 to M4.When input voltage is less time, M1 conducting, electric current is only by first paragraph LED string, and when input voltage increases time, M1 resistance increases gradually, to reach current limliting object.When input voltage is enough high, M1 opens completely, and electric current is by second segment lamp string.When input voltage continues to increase, M2 resistance increases gradually.Hold back leakage resistance and current circuit series connection with one, when LED load electric current increases, the mode reducing the effective grid voltage of MOS by holding back voltage increase on leakage resistance limits LED current, reaches steady flow result.
The invention is not restricted to adopt resistance as holding back stream device.A diode as shown in Figure 4 as the circuit holding back stream device, and utilizes the design's thinking, adopts the device of other I-V characteristics or circuit to realize holding back the circuit of stream effect, all within the scope of this circuit Right protection.
As shown in Figure 4, different metal-oxide-semiconductor M1 to M4 adds different grid voltage, realize the effect of the LED segmentation conducting when different input voltage.A metal-oxide-semiconductor M0 is added, for generation of the minimum leakage current preventing controllable silicon stroboscopic in LED front end.M0 adds a grid coupling capacitance.When input has pulse surge voltage, open M0 by coupling circuit, produce the effect of release surge voltage, protective circuit.The coupling that what other were similar utilize thinking of the present invention to design surge protection circuit of releasing can be adopted by the present invention.
It should be noted that, LED conducting hop count of the present invention is not limited to as shown in Figure 44 sections.
Due to process technology limit, the structure that the present invention adopts metal-oxide-semiconductor to be separated with control IC usually.But the present invention includes the structural design that MOS and IC is integrated.The present invention can realize the current-limit mode that fixed railing pole tension controls segmentation metal-oxide-semiconductor switch.
Control to compare with conventional constant current, the present invention has following advantage in result of use: Circuit responce speed is fast.It is real-time that resistance holds back stream feedback, can not produce the current spikes because circuit response time causes slowly.Strong to surge resistivity.Because circuit responds fast, surge can not be caused to puncture LED. and surge voltage leadage circuit can be integrated in first order metal-oxide-semiconductor simultaneously.LED current is stablized.The Shimmering that input voltage fluctuation can not cause LED current fluctuation to produce.Good with controllable silicon light modulation compatibility.The present invention can be easy to design larger leakage current circuit, with better and controllable silicon compatibility.Cost is low.Present invention, avoiding the design of high-performance feedback amplifier, chip area reduces.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the resistance for LED drive part by part holds back a current circuit, comprises series topology structure, and described series topology structure comprises one or more tandem drive module, and described tandem drive module comprises metal-oxide-semiconductor and LED strip, and described metal-oxide-semiconductor and LED strip are for being connected in series; It is characterized in that,
Described metal-oxide-semiconductor source electrode and systematically between access one hold back stream device, described in hold back stream device and connect with current circuit, when LED load electric current increases, flow voltage increase on device reduce the effective grid voltage of MOS by holding back, limit LED current.
2. hold back current circuit for the resistance of LED drive part by part as claimed in claim 1, it is characterized in that,
Described stream device of holding back is for holding back leakage resistance or diode.
3. hold back current circuit for the resistance of LED drive part by part as claimed in claim 1, it is characterized in that,
Also comprise coupling circuit, described coupling circuit comprises: arrange a metal-oxide-semiconductor M0 in described multiple tandem drive module front end, at metal-oxide-semiconductor M0 grid butt coupling electric capacity; When input has pulse surge voltage, open M0 by described coupling circuit and to release surge voltage, protective circuit.
4. hold back current circuit for the resistance of LED drive part by part as claimed in claim 1, it is characterized in that,
Also comprise control IC, described control IC adds different grid voltage on different metal-oxide-semiconductor, realizes the LED segmentation conducting when different input voltage.
5. hold back current circuit for the resistance of LED drive part by part as claimed in claim 1, it is characterized in that, described tandem drive module is 4.
6. hold back current circuit for the resistance of LED drive part by part as claimed in claim 4, it is characterized in that, described metal-oxide-semiconductor and control IC are separated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510363492.5A CN104968103A (en) | 2015-06-26 | 2015-06-26 | Resistance current repressing circuit used for LED sectional drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510363492.5A CN104968103A (en) | 2015-06-26 | 2015-06-26 | Resistance current repressing circuit used for LED sectional drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104968103A true CN104968103A (en) | 2015-10-07 |
Family
ID=54221986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510363492.5A Pending CN104968103A (en) | 2015-06-26 | 2015-06-26 | Resistance current repressing circuit used for LED sectional drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104968103A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657915A (en) * | 2016-04-05 | 2016-06-08 | 易美芯光（北京）科技有限公司 | Segmented LED drive circuit based on low-voltage off mode |
| CN107041039A (en) * | 2017-05-09 | 2017-08-11 | 易美芯光（北京）科技有限公司 | A kind of LED light engine module of tunable optical toning |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070109698A1 (en) * | 2005-11-15 | 2007-05-17 | Magnachip Semiconductor, Ltd. | ESD protection circuit |
| CN101668373A (en) * | 2009-09-29 | 2010-03-10 | 李云霄 | LED light source driving circuit supplied by AC power |
| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN102186282A (en) * | 2011-03-21 | 2011-09-14 | 中国航天科技集团公司第九研究院第七七一研究所 | Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp |
| CN103152894A (en) * | 2013-03-13 | 2013-06-12 | 深圳贝特莱电子科技有限公司 | Sectional type LED (light emitting diode) driving circuit based on AC (alternating current) power supply |
| CN203708590U (en) * | 2014-01-26 | 2014-07-09 | 深圳市梓晶微科技有限公司 | High-efficiency LED linear constant current control circuit possessing high power factor |
| CN204761784U (en) * | 2015-06-26 | 2015-11-11 | 易美芯光（北京）科技有限公司 | A current circuit is held back to resistance for LED sectional drive |
-
2015
- 2015-06-26 CN CN201510363492.5A patent/CN104968103A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070109698A1 (en) * | 2005-11-15 | 2007-05-17 | Magnachip Semiconductor, Ltd. | ESD protection circuit |
| CN101668373A (en) * | 2009-09-29 | 2010-03-10 | 李云霄 | LED light source driving circuit supplied by AC power |
| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN102186282A (en) * | 2011-03-21 | 2011-09-14 | 中国航天科技集团公司第九研究院第七七一研究所 | Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp |
| CN103152894A (en) * | 2013-03-13 | 2013-06-12 | 深圳贝特莱电子科技有限公司 | Sectional type LED (light emitting diode) driving circuit based on AC (alternating current) power supply |
| CN203708590U (en) * | 2014-01-26 | 2014-07-09 | 深圳市梓晶微科技有限公司 | High-efficiency LED linear constant current control circuit possessing high power factor |
| CN204761784U (en) * | 2015-06-26 | 2015-11-11 | 易美芯光（北京）科技有限公司 | A current circuit is held back to resistance for LED sectional drive |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657915A (en) * | 2016-04-05 | 2016-06-08 | 易美芯光（北京）科技有限公司 | Segmented LED drive circuit based on low-voltage off mode |
| CN105657915B (en) * | 2016-04-05 | 2017-12-05 | 易美芯光（北京）科技有限公司 | A kind of segmented LED drive circuit based on low pressure close pattern |
| CN107041039A (en) * | 2017-05-09 | 2017-08-11 | 易美芯光（北京）科技有限公司 | A kind of LED light engine module of tunable optical toning |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102333403B (en) | Protection circuit for preventing LED from impact | |
| CN104427688B (en) | LED alternating-current drive circuit | |
| TWI583245B (en) | Led drivers and led driving methods therefor | |
| CN103401209B (en) | LED-backlit short-circuit protection circuit | |
| CN103384436B (en) | LED-backlit constant-current circuit | |
| CN103561509B (en) | Switching tube separated LED driving circuit structure | |
| CN104125680A (en) | Variable power supply dimming control circuit | |
| CN105230130A (en) | The control circuit of LED light device and voltage generating method | |
| CN104968103A (en) | Resistance current repressing circuit used for LED sectional drive | |
| CN204761784U (en) | A current circuit is held back to resistance for LED sectional drive | |
| CN103037560A (en) | Automatic dimming emergency lamp | |
| CN202190067U (en) | Led impact protection circuit | |
| CN202495757U (en) | Impulse current limiting circuit and corresponding chopping dimming system thereof | |
| CN104797062B (en) | Non-strobe high-efficiency LED (light-emitting diode) driving manner compatible with phase-controlled light modulator | |
| CN103137080A (en) | Light-emitting dioxide (LED) backlight drive circuit, liquid crystal display device and driving method | |
| CN201054826Y (en) | LED lamp driving circuit | |
| CN201887984U (en) | Constant-current switch power source capable of driving multiple LED lamps | |
| CN201623904U (en) | Current equalizing control circuit of capacitance type light-emitting diodes | |
| CN104427692A (en) | Light-controlled automatic switch circuit and lamp | |
| CN102625517B (en) | Isolated type LED light fixture adjustable light power supply | |
| US20190166663A1 (en) | Currnet holding circuit for bidirectional triode thyristor dimmer and linear dimming driving circuit using the same | |
| KR101488682B1 (en) | Dimming control of led lighting circuits | |
| TW201301945A (en) | Control circuit module of light emitting diode lamp device with reduced power consumption | |
| CN104080226B (en) | A kind of circuit controlling triode switch according to sample rate current | |
| CN201731335U (en) | Alternating current direct-drive LED lamp tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151007 |