CN204761784U - A current circuit is held back to resistance for LED sectional drive - Google Patents
A current circuit is held back to resistance for LED sectional drive Download PDFInfo
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- CN204761784U CN204761784U CN201520449731.4U CN201520449731U CN204761784U CN 204761784 U CN204761784 U CN 204761784U CN 201520449731 U CN201520449731 U CN 201520449731U CN 204761784 U CN204761784 U CN 204761784U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model provides a current circuit is held back to resistance for LED sectional drive, including series connection topological structure, series connection topological structure includes one or more series connection drive module, series connection drive module includes MOS pipe and LED cluster, the MOS pipe is the series connection with the LED cluster, MOS pipe source electrode with systematically between one access hold back a class device, hold back class device and establish ties with the current loop, when LED load current increases, reduce the effective grid voltage of MOS, restriction LED electric current through voltage increase on holding back class device. The utility model has the characteristics of circuit response speed is fast, and is strong to the surge resistivity, and LED current stabilization and silicon controlled rectifier compatibility are good, with low costs.
Description
Technical field
The utility model relates to LED (light-emitting diode) lighting field, and 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.
Utility model content
Technical problem to be solved in the utility model 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 utility model provides a kind of resistance for LED drive part by part and holds 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 utility model 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 utility model can be easy to design larger leakage current circuit, with better and controllable silicon compatibility.
5, cost is low.The utility model avoids the design of high-performance feedback amplifier, and 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 the utility model embodiment holds back current circuit schematic diagram.
Fig. 4 is that the resistance for LED drive part by part of another embodiment of the utility model holds back current circuit schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of all.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Main thought of the present utility model 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 the utility model embodiment 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 preferred embodiment of the present utility model, described in hold back stream device for holding back leakage resistance or diode.
In a preferred embodiment of the present utility model, 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 utility model embodiment 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 utility model 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 utility model is not limited 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 utility model to design surge protection circuit of releasing can be adopted by the utility model.
It should be noted that, the utility model LED conducting hop count is not limited to as shown in Figure 44 sections.
Due to process technology limit, the structure that the utility model adopts metal-oxide-semiconductor to be separated with control IC usually.But the utility model comprises the integrated structural design of MOS and IC.The utility model 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 utility model 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 utility model can be easy to design larger leakage current circuit, with better and controllable silicon compatibility.Cost is low.The utility model avoids the design of high-performance feedback amplifier, and chip area reduces.
Above-described embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only embodiment of the present utility model; and be not used in restriction protection range of the present utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
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 |
|---|---|---|---|
| CN201520449731.4U CN204761784U (en) | 2015-06-26 | 2015-06-26 | A current circuit is held back to resistance for LED sectional drive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520449731.4U CN204761784U (en) | 2015-06-26 | 2015-06-26 | A current circuit is held back to resistance for LED sectional drive |
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| CN204761784U true CN204761784U (en) | 2015-11-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104968103A (en) * | 2015-06-26 | 2015-10-07 | 易美芯光（北京）科技有限公司 | Resistance current repressing circuit used for LED sectional drive |
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- 2015-06-26 CN CN201520449731.4U patent/CN204761784U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104968103A (en) * | 2015-06-26 | 2015-10-07 | 易美芯光（北京）科技有限公司 | Resistance current repressing circuit used for LED sectional drive |
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