CN204836722U - LED drive power supply segmentation dimmer circuit - Google Patents
LED drive power supply segmentation dimmer circuit Download PDFInfo
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- CN204836722U CN204836722U CN201520618267.7U CN201520618267U CN204836722U CN 204836722 U CN204836722 U CN 204836722U CN 201520618267 U CN201520618267 U CN 201520618267U CN 204836722 U CN204836722 U CN 204836722U
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- 230000011218 segmentation Effects 0.000 title claims abstract description 29
- 239000003381 stabilizer Substances 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The utility model relates to a LED drive power supply segmentation dimmer circuit, include: loop circuit, emitting diode and segmentation detection circuitry, loop circuit and segmentation detection circuitry comparator as follows mainly constitute. The utility model discloses the LED drive power supply segmentation dimmer circuit who obtains realizes the segmentation through comparator and reference source and triode and adjusts luminance, need not to use the singlechip chip, and this circuit can set up a plurality of segmentation point according to the segmentation demand to satisfy various demands, these technological characteristics are simple structure, and with low costs, the practical function is obvious.
Description
Technical field
The utility model relates to LED drive power technical field, especially relates to a kind of LED drive power sectional dimming circuit.
Background technology
LED drive power sectional dimming circuit prior art is all monolithic computer remote control (power carrier control), this circuit is complicated, volume is large, failure rate is high, cost is high and outlet side output line at least four is installed complicated, if simultaneously because be integrating control one tunnel light modulation terminal shortcircuit will there will be that light modulation is out of control cannot light modulation, though single-chip microcomputer light modulation needs burning program to control simultaneously, multiple power supplies complex circuit holding wire is long easily causes single-chip microcomputer code error afterwards.
Utility model content
The purpose of this utility model is to solve the problem that in above-mentioned prior art, circuit structure is complicated, cost is high, providing a kind of LED drive power sectional dimming circuit.
To achieve these goals, a kind of LED drive power sectional dimming circuit designed by the utility model, comprising: loop circuit, light-emitting diode and segmentation testing circuit; Described loop circuit comprises: the first comparator, the second comparator, the first diode, the second diode and the first resistance; Described first comparator, its negative input end ground connection, its positive input termination first positive voltage, its output connects the negative pole end of described light-emitting diode by described first diode of reversal connection; Described second comparator, its negative input end ground connection, its positive input terminal is connected with the positive input terminal of described first comparator by described first resistance, and its output connects the negative pole end of described light-emitting diode by described second diode of reversal connection; The positive terminal of described light-emitting diode connects described first positive voltage; Described segmentation testing circuit comprises: voltage-reference, the first thermistor, the 3rd comparator, the 4th comparator, the first triode, the second triode and the second resistance; Described voltage-reference, the first positive voltage described in its negative pole termination, its positive terminal ground connection, its reference edge connects the negative input end of described 3rd comparator; Described 3rd comparator, its positive input terminal connects described first positive voltage by described thermistor, and its output connects the base terminal of described first triode; Described first triode, its collector terminal connects the positive input terminal of described first comparator, and its emitter terminal connects the positive input terminal of described second comparator; Described 4th comparator, its positive input terminal connects described first positive voltage by described thermistor, and its negative input end connects the negative input end of described 3rd comparator by described second resistance, and its output connects the base terminal of described second triode; Described second triode, its collector terminal is connected with the positive input terminal of described first comparator, and its emitter terminal is connected with the positive input terminal of described second comparator.
Preferably, described segmentation testing circuit comprises: the first voltage-stabiliser tube and the second voltage-stabiliser tube; Described 3rd comparator is connected by the first voltage-stabiliser tube with between described first triode, described first voltage-stabiliser tube, and its negative pole end is connected with the output of described 3rd comparator, and its positive terminal is connected with the base terminal of described first triode; Described 4th comparator is connected by the second voltage-stabiliser tube with between described second triode, described second voltage-stabiliser tube, and its negative pole end is connected with the output of described 4th comparator, and its positive terminal is connected with the base terminal of described second triode.
Preferably, also comprise: the thermal-shutdown circuit be made up of thermistor and voltage-stabiliser tube, this thermal-shutdown circuit connects described first positive voltage.
Preferably, described thermal-shutdown circuit comprises: the second thermistor, the 3rd voltage-stabiliser tube, the 4th voltage-stabiliser tube, the 3rd diode; Described 3rd voltage-stabiliser tube, its positive terminal ground connection, the first positive voltage described in its negative pole termination and connect one end of described second thermistor; The other end of described second thermistor connects the positive terminal of described 3rd diode, and the negative pole end of described 3rd diode connects the negative pole end of described 4th voltage-stabiliser tube, the positive terminal ground connection of described 4th voltage-stabiliser tube.
Preferably, also comprise in described loop circuit and described segmentation testing circuit: several are for adjusting the proportion resistor of the reference voltage/reference current of each comparator.
Preferably, at least one filter capacitor is also comprised in described loop circuit and described segmentation testing circuit.
Preferably, described first triode and the second triode are NPN type triode.
Preferably, the model of described voltage-reference is TL431.
A kind of LED drive power sectional dimming circuit that the utility model obtains, sectional dimming is realized by comparator and a reference source and triode, without the need to using singlechip chip, this circuit can arrange several waypoints according to segmentation demand, to meet various demand, the feature of these technology is that structure is simple, and cost is low, and practical function is obvious.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of embodiment.
In figure: component names is numbered, loop circuit (1), segmentation testing circuit (2), thermal-shutdown circuit (3), secondary commutation circuit (4), light-emitting diode (OT1), first comparator (U1A), second comparator (U1B), first diode (D8), second diode (D9), first resistance (R15), first voltage-stabiliser tube (ZD7), second voltage-stabiliser tube (ZD9), second thermistor (RT1), 3rd voltage-stabiliser tube (ZD1), 4th voltage-stabiliser tube (ZD3), 3rd diode (D4), first transformer (T3), second transformer (T4), resistance (R3), resistance (R1), resistance (R6), resistance (R4), resistance (R7), resistance (R8), resistance (R5), resistance (R10), resistance (R18), resistance (R9), resistance (R11), resistance (R12), resistance (R2), resistance (R16), resistance (R17), resistance (R22), resistance (R24), resistance (R25), resistance (R19), resistance (R20), resistance (R26), diode (D2), diode (D6), electric capacity (C5), electric capacity (C7), electric capacity (C6), electric capacity (C11), electric capacity (C12), electric capacity (C8), electric capacity (C9), electric capacity (C10), electric capacity (C13), electric capacity (C14), electric capacity (C15), electric capacity (C), electric capacity (C16), electric capacity (C17).
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Embodiment:
As shown in Figure 1, disclose a kind of LED drive power sectional dimming circuit, comprising: loop circuit (1), light-emitting diode (OT1) and segmentation testing circuit (2); Described loop circuit (1) comprising: the first comparator (U1A), the second comparator (U1B), the first diode (D8), the second diode (D9) and the first resistance (R15); Described first comparator (U1A), its negative input end ground connection, its positive input termination first positive voltage, its output connects the negative pole end of described light-emitting diode (OT1) by described first diode (D8) of reversal connection; Described second comparator (U1B), its negative input end ground connection, its positive input terminal is connected with the positive input terminal of described first comparator (U1A) by described first resistance (R15), and its output connects the negative pole end of described light-emitting diode (OT1) by described second diode (D9) of reversal connection; The positive terminal of described light-emitting diode (OT1) connects described first positive voltage; Described segmentation testing circuit (2) comprising: voltage-reference (ZD5), the first thermistor (RT2), the 3rd comparator (U1C), the 4th comparator (U1D), the first triode (Q1), the second triode (Q2) and the second resistance (R22); Described voltage-reference (ZD5), the first positive voltage described in its negative pole termination, its positive terminal ground connection, its reference edge connects the negative input end of described 3rd comparator (U1C); Described 3rd comparator (U1C), its positive input terminal connects described first positive voltage by described thermistor (RT2), and its output connects the base terminal of described first triode (Q1); Described first triode (Q1), its collector terminal connects the positive input terminal of described first comparator (U1A), and its emitter terminal connects the positive input terminal of described second comparator (U1B); Described 4th comparator (U1D), its positive input terminal connects described first positive voltage by described thermistor (RT2), its negative input end connects the negative input end of described 3rd comparator (U1C) by described second resistance (R22), and its output connects the base terminal of described second triode (Q2); Described second triode (Q2), its collector terminal is connected with the positive input terminal of described first comparator (U1A), and its emitter terminal is connected with the positive input terminal of described second comparator (U1B).
A kind of LED drive power sectional dimming circuit that the utility model obtains, sectional dimming is realized by comparator and a reference source and triode, without the need to using singlechip chip, this circuit can arrange several waypoints according to segmentation demand, to meet various demand, the feature of these technology is that structure is simple, and cost is low, and practical function is obvious.
In some illustrative embodiment, described segmentation testing circuit (2) comprising: the first voltage-stabiliser tube (ZD7) and the second voltage-stabiliser tube (ZD9); Described 3rd comparator (U1C) is connected by the first voltage-stabiliser tube (ZD7) with between described first triode (Q1), described first voltage-stabiliser tube (ZD7), its negative pole end is connected with the output of described 3rd comparator (U1C), and its positive terminal is connected with the base terminal of described first triode (Q1); Described 4th comparator (U1D) is connected by the second voltage-stabiliser tube (ZD9) with between described second triode (Q2), described second voltage-stabiliser tube (ZD9), its negative pole end is connected with the output of described 4th comparator (U1D), and its positive terminal is connected with the base terminal of described second triode (Q2).
In some illustrative embodiment, also comprise: the thermal-shutdown circuit (3) be made up of thermistor and voltage-stabiliser tube, this thermal-shutdown circuit (3) connects described first positive voltage.
In some illustrative embodiment, described thermal-shutdown circuit (3) comprising: the second thermistor (RT1), the 3rd voltage-stabiliser tube (ZD1), the 4th voltage-stabiliser tube (ZD3), the 3rd diode (D4); Described 3rd voltage-stabiliser tube (ZD1), its positive terminal ground connection, the first positive voltage described in its negative pole termination and connect one end of described second thermistor (RT1); The other end of described second thermistor (RT1) connects the positive terminal of described 3rd diode (D4), the negative pole end of described 3rd diode (D4) connects the negative pole end of described 4th voltage-stabiliser tube (ZD3), the positive terminal ground connection of described 4th voltage-stabiliser tube (ZD3).
In some illustrative embodiment, also comprise in described loop circuit (1) and described segmentation testing circuit (2): several are for adjusting the proportion resistor of the reference voltage/reference current of each comparator.Such as shown in Fig. 1.
In some illustrative embodiment, in described loop circuit (1) and described segmentation testing circuit (2), also comprise at least one filter capacitor.Such as shown in Fig. 1.
In some illustrative embodiment, described first triode (Q1) and the second triode (Q2) are NPN type triode.
In some illustrative embodiment, the model of described voltage-reference (ZD5) is TL431.
In some illustrative embodiment, also comprise: the secondary commutation circuit (4) of the first transformer (T3).
In some illustrative embodiment, described first positive voltage is produced by the primary side of the second voltage device (T4).
This circuit is in order to control output current benchmark thus to reach the object controlling electric power outputting current, the effect of control is reached by the temperature of segmentation testing environment temperature or certain components and parts, as Fig. 1, circuit increase only segmentation and detects and cross circuit temperature compared with traditional circuit, first do by TL431 the forward end that negative terminal that benchmark is input to comparator utilizes the negative temperature coefficient feature access comparator of thermistor in segment circuit module, when temperature is greater than negative voltage close to dividing potential drop during a certain value, comparator exports high potential triode on resistance directly and on electric current loop on inclined resistance, electric current loop reference voltage raises output current and increases, when temperature be elevated to second temperature rise point, second comparator to export on high potential and electric current loop partially resistance mutually also output current increase, by can arrange after the multiple comparator of this circuit multiple waypoint (as circuit start working time be 25%, first starts to control some that the device compared arbitrarily can be set greater than 25% and starts to control a little, second comparator be greater than first start to control after comparator, need multiple waypoint can compare according to increase if only drawn two waypoints herein), thus reach the object of sectional dimming, this waypoint arranges simple need change the object that reference resistance can reach segmentation, when temperature rises to the peak of setting, ZD3 conducting output current linearly reduces simultaneously, thus reach the object of protection power source.
This circuit has environmental protection, reduces costs, and reduces power failure rate, the advantage of diversification light modulation.
For the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; its framework form can be flexible and changeable; just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the utility model is determined by submitted to claims.
Claims (8)
1. a LED drive power sectional dimming circuit, is characterized in that, comprising: loop circuit (1), light-emitting diode (OT1) and segmentation testing circuit (2);
Described loop circuit (1) comprising: the first comparator (U1A), the second comparator (U1B), the first diode (D8), the second diode (D9) and the first resistance (R15); Described first comparator (U1A), its negative input end ground connection, its positive input termination first positive voltage, its output connects the negative pole end of described light-emitting diode (OT1) by described first diode (D8) of reversal connection; Described second comparator (U1B), its negative input end ground connection, its positive input terminal is connected with the positive input terminal of described first comparator (U1A) by described first resistance (R15), and its output connects the negative pole end of described light-emitting diode (OT1) by described second diode (D9) of reversal connection;
The positive terminal of described light-emitting diode (OT1) connects described first positive voltage;
Described segmentation testing circuit (2) comprising: voltage-reference (ZD5), the first thermistor (RT2), the 3rd comparator (U1C), the 4th comparator (U1D), the first triode (Q1), the second triode (Q2) and the second resistance (R22); Described voltage-reference (ZD5), the first positive voltage described in its negative pole termination, its positive terminal ground connection, its reference edge connects the negative input end of described 3rd comparator (U1C); Described 3rd comparator (U1C), its positive input terminal connects described first positive voltage by described thermistor (RT2), and its output connects the base terminal of described first triode (Q1); Described first triode (Q1), its collector terminal connects the positive input terminal of described first comparator (U1A), and its emitter terminal connects the positive input terminal of described second comparator (U1B); Described 4th comparator (U1D), its positive input terminal connects described first positive voltage by described thermistor (RT2), its negative input end connects the negative input end of described 3rd comparator (U1C) by described second resistance (R22), and its output connects the base terminal of described second triode (Q2); Described second triode (Q2), its collector terminal is connected with the positive input terminal of described first comparator (U1A), and its emitter terminal is connected with the positive input terminal of described second comparator (U1B).
2. a kind of LED drive power sectional dimming circuit according to claim 1, is characterized in that, described segmentation testing circuit (2) comprising: the first voltage-stabiliser tube (ZD7) and the second voltage-stabiliser tube (ZD9);
Described 3rd comparator (U1C) is connected by the first voltage-stabiliser tube (ZD7) with between described first triode (Q1), described first voltage-stabiliser tube (ZD7), its negative pole end is connected with the output of described 3rd comparator (U1C), and its positive terminal is connected with the base terminal of described first triode (Q1);
Described 4th comparator (U1D) is connected by the second voltage-stabiliser tube (ZD9) with between described second triode (Q2), described second voltage-stabiliser tube (ZD9), its negative pole end is connected with the output of described 4th comparator (U1D), and its positive terminal is connected with the base terminal of described second triode (Q2).
3. a kind of LED drive power sectional dimming circuit according to claim 1, is characterized in that, also comprise:
The thermal-shutdown circuit (3) be made up of thermistor and voltage-stabiliser tube, this thermal-shutdown circuit (3) connects described first positive voltage.
4. a kind of LED drive power sectional dimming circuit according to claim 3, it is characterized in that, described thermal-shutdown circuit (3) comprising: the second thermistor (RT1), the 3rd voltage-stabiliser tube (ZD1), the 4th voltage-stabiliser tube (ZD3), the 3rd diode (D4);
Described 3rd voltage-stabiliser tube (ZD1), its positive terminal ground connection, the first positive voltage described in its negative pole termination and connect one end of described second thermistor (RT1); The other end of described second thermistor (RT1) connects the positive terminal of described 3rd diode (D4), the negative pole end of described 3rd diode (D4) connects the negative pole end of described 4th voltage-stabiliser tube (ZD3), the positive terminal ground connection of described 4th voltage-stabiliser tube (ZD3).
5. a kind of LED drive power sectional dimming circuit according to any one of claim 1-4, it is characterized in that, also comprise in described loop circuit (1) and described segmentation testing circuit (2): several are for adjusting the proportion resistor of the reference voltage/reference current of each comparator.
6. a kind of LED drive power sectional dimming circuit according to any one of claim 1-4, is characterized in that, also comprises at least one filter capacitor in described loop circuit (1) and described segmentation testing circuit (2).
7. a kind of LED drive power sectional dimming circuit according to any one of claim 1-4, is characterized in that, described first triode (Q1) and the second triode (Q2) are NPN type triode.
8. a kind of LED drive power sectional dimming circuit according to any one of claim 1-4, is characterized in that, the model of described voltage-reference (ZD5) is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618267.7U CN204836722U (en) | 2015-08-18 | 2015-08-18 | LED drive power supply segmentation dimmer circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618267.7U CN204836722U (en) | 2015-08-18 | 2015-08-18 | LED drive power supply segmentation dimmer circuit |
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| Publication Number | Publication Date |
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| CN204836722U true CN204836722U (en) | 2015-12-02 |
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| CN201520618267.7U Expired - Fee Related CN204836722U (en) | 2015-08-18 | 2015-08-18 | LED drive power supply segmentation dimmer circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010085A (en) * | 2019-03-28 | 2019-07-12 | 深圳创维－Rgb电子有限公司 | A kind of backlight drive adjusts circuit, chip and method |
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2015
- 2015-08-18 CN CN201520618267.7U patent/CN204836722U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110010085A (en) * | 2019-03-28 | 2019-07-12 | 深圳创维－Rgb电子有限公司 | A kind of backlight drive adjusts circuit, chip and method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 |