CN203136242U - LED constant-current circuit with PWM light modulation - Google Patents
LED constant-current circuit with PWM light modulation Download PDFInfo
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- CN203136242U CN203136242U CN 201320003556 CN201320003556U CN203136242U CN 203136242 U CN203136242 U CN 203136242U CN 201320003556 CN201320003556 CN 201320003556 CN 201320003556 U CN201320003556 U CN 201320003556U CN 203136242 U CN203136242 U CN 203136242U
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Abstract
Provided by the utility model is an LED constant-current circuit with PWM light modulation. The LED constant-current circuit is composed of a power supply, an automatic control constant-current circuit, an LED light string, and a PWM light modulation module. The LED light string is connected in series with the automatic control constant-current circuit that supplies constant currents for the LED light string; and a circuit load formed by the LED light string and the automatic control constant-current circuit is connected between the positive electrode and the negative electrode of the power supply. The automatic control constant-current circuit includes a voltage detection control circuit and a constant-current circuit. The PWM light modulation module is connected with the automatic control constant-current circuit and provides a port capable of receiving a PWM signal; and the PWM signal controls the connection and disconnection of the constant-current circuit.
Description
Technical field
The utility model relates to LED illuminating lamp drive circuit design field, particularly a kind of LED constant-current circuit with the PWM light modulation.
Background technology
Light-emitting diode (LED) solid light source has advantages such as luminous efficiency height, environmental protection, long-life, be described as the 5th generation lighting source.Because efficient height, the good energy-conserving effect of LED light fixture, the LED light fixture has progressively substituted white light, and the LED light fixture has begun to move to maturity.At present, in order to obtain the LED light fixture of different-colour, varying strength, people have also done a large amount of research in this respect.
The method that realizes light modulation in the prior art mainly adopts dual mode:
One: realize dimming effect by adjustable or semifixed resistor, by changing effective resistance of adjustable or semifixed resistor, thereby raise or reduce the driving voltage of LED light fixture, and then reach and transfer big or turn the effect of LED lamp luminescence intensity down.The shortcoming of this adjusting luminous intensity is: because adjustable extent adjustable or semifixed resistor is limited, like this with regard to significant limitation regulate the flexibility of brightness; If further also need to integrate other keypress functions, just must increase other buttons in addition, so not only taken the space, and it is also extremely inconvenient to operate.
Its two: change to realize the effect of light modulation by the electric current of regulating LED light fixture two ends, this method generally all is to adopt singlechip chip to concentrate to control, and each pixel all needs a controllable current source.The shortcoming of this adjusting luminous intensity is: circuit is extremely complicated, causes design cost and working service cost all very high.
In sum, also there is a lot of weak points in prior art, awaits further improving.
The utility model content
The purpose of this utility model is the problem that prior art exists is solved, and especially needs to solve the little and circuit complicated problems of dimming scope in the prior art.
For reaching above purpose, the utility model adopts following technical scheme to be achieved:
1, a kind of LED constant-current circuit with the PWM light modulation is characterized in that: comprise power supply, automatic control constant-current circuit, LED lamp string and PWM light-adjusting module; Described LED lamp string is connected with described automatic control constant-current circuit, and the circuit load that described LED lamp string and automatic control constant-current circuit are formed is connected between the positive pole and negative pole of power supply, and described PWM light-adjusting module is connected with the automatic control constant-current circuit.
2, the LED constant-current circuit of band PWM according to claim 1 light modulation, it is characterized in that: described automatic control constant-current circuit comprises a voltage detecting and controling circuit and a constant-current circuit; Described voltage detecting and controling circuit comprises voltage detecting and controling circuit triode, first divider resistance and second divider resistance; Described constant-current circuit comprises constant-current circuit metal-oxide-semiconductor, a current-limiting resistance, a current sense resistor and a constant-current circuit triode;
One end of first divider resistance and an end of second divider resistance are connected the base stage of voltage detecting and controling circuit triode simultaneously, the other end of first divider resistance connects the negative terminal of described LED lamp string, the other end of second divider resistance connects the negative pole of power supply, the collector electrode of voltage detecting and controling circuit triode connects the grid of constant-current circuit metal-oxide-semiconductor, and the emitter of voltage detecting and controling circuit triode connects the negative pole of power supply;
One end of the drain electrode of constant-current circuit metal-oxide-semiconductor and current-limiting resistance is connected the negative terminal of LED lamp string, one end of the source electrode of constant-current circuit metal-oxide-semiconductor and current sense resistor is connected the base stage of constant-current circuit triode simultaneously, and the grid of constant-current circuit metal-oxide-semiconductor connects the other end of current-limiting resistance, the collector electrode of voltage detecting and controling circuit triode and the collector electrode of constant-current circuit triode simultaneously;
The other end of current-limiting resistance connects the collector electrode of constant-current circuit triode and the collector electrode of voltage detecting and controling circuit triode, and the emitter of the other end of current sense resistor and constant-current circuit triode all is connected to the negative pole of power supply.
3, the LED constant-current circuit of band PWM according to claim 2 light modulation, it is characterized in that: described PWM light-adjusting module is provided with PWM light modulation port, and described PWM light modulation port is connected with described first divider resistance, second divider resistance and the base stage three's of voltage detecting and controling circuit triode junction.
Compared with prior art, the utility model provides a kind of LED constant-current circuit with the PWM dimming function.This LED constant-current circuit comprises LED lamp string, automatic control constant-current circuit, PWM light-adjusting module, and this utility model has solved traditional LED constant current and driven cost height, light adjusting circuit complexity, problem that dimming scope is little.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the physical circuit figure of an embodiment provided by the utility model.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment is clearer, below in conjunction with the utility model embodiment and accompanying drawing, the technical scheme among the utility model embodiment is clearly and completely described.Need to prove that described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not paying the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.
As shown in Figure 1, the LED constant-current circuit of the band PWM light modulation that present embodiment provides comprises power supply, automatic control constant-current circuit, LED lamp string and PWM light-adjusting module; Described LED lamp string is connected with described automatic control constant-current circuit, and the circuit load that described LED lamp string and automatic control constant-current circuit are formed is connected between the positive pole and negative pole of power supply, and described PWM light-adjusting module is connected with the automatic control constant-current circuit.
The automatic control constant-current circuit comprises voltage detecting and controling circuit and constant-current circuit.
Described voltage detecting and controling circuit comprises voltage detecting and controling circuit triode V2, the first divider resistance R1 and the second divider resistance R3, one end of two divider resistances connects the base stage of voltage detecting and controling circuit triode V2 simultaneously, the other end of the first divider resistance R1 connects the negative terminal of described LED lamp string, the other end of the second divider resistance R3 connects the negative pole of power supply, the collector electrode of voltage detecting and controling circuit triode V2 connects the grid of constant-current circuit metal-oxide-semiconductor V1, and the emitter of voltage detecting and controling circuit triode V2 connects the negative pole of power supply.
Described constant-current circuit comprises constant-current circuit metal-oxide-semiconductor V1, current-limiting resistance R2, a current sense resistor R4 and a constant-current circuit triode V3.
The drain electrode of constant-current circuit metal-oxide-semiconductor V1 is connected the negative terminal of LED lamp string with the end of current-limiting resistance R2; The source electrode of constant-current circuit metal-oxide-semiconductor V1 and the end of current sense resistor R4 are connected the base stage of constant-current circuit triode V3 simultaneously; The grid of constant-current circuit metal-oxide-semiconductor V1 connects the other end of the first current-limiting resistance R2, the collector electrode of voltage detecting and controling circuit triode V2 and the collector electrode of constant-current circuit triode V3 simultaneously.
The other end of current-limiting resistance R2 connects the collector electrode of constant-current circuit triode V3 and the collector electrode of voltage detecting and controling circuit triode V2; The emitter of the other end of current sense resistor R4 and constant-current circuit triode V3 is connected to the negative pole of power supply,
Described PWM light-adjusting module is provided with PWM light modulation port, and described PWM light modulation port is connected with described first divider resistance, second divider resistance and the base stage three's of voltage detecting and controling circuit triode junction.Described PWM light modulation port is added in the PWM dim signal turn-on and turn-off of control voltage detecting control triode on first divider resistance and second divider resistance by receiving the outside PWM dim signal that sends.
Described PWM light modulation port can receive the PWM dim signal of sending here the outside, this PWM dim signal can directly be connected on the base stage of voltage detecting and controling circuit triode V2, also can the base stage of voltage detecting and controling circuit triode V2 be kept apart and then be delivered to PWM dim signal and major loop by optocoupler, pwm signal is by conducting and the disconnection of the branch pressure-controlled voltage detecting and controling circuit triode V2 on the second divider resistance R3.
Described automatic control constant-current circuit is itself to be to flow through electric current dividing potential drop then on the current sense resistor R4 by control, controls conducting and the shutoff of voltage detecting and controling circuit triode V2, and then makes the electric current that flows through constant-current circuit metal-oxide-semiconductor V1 reach constant purpose.Voltage detecting and controling circuit triode V2 directly is connected with constant-current circuit metal-oxide-semiconductor V1 grid, the turn-on and turn-off of voltage detecting and controling circuit triode V2 can directly be controlled the turn-on and turn-off of constant-current circuit metal-oxide-semiconductor V1, and then can control the size of current that flows through constant-current circuit metal-oxide-semiconductor V1, LED lamp string and constant-current circuit metal-oxide-semiconductor V1 series connection, and the electric current of flow through LED lamp string and constant-current circuit metal-oxide-semiconductor V1 equates, by regulating the duty ratio of PWM dim signal, and then can control the size of current that flows through constant-current circuit metal-oxide-semiconductor V1, thereby the size of current of LED lamp string is flow through in control, realizes the purpose of LED light modulation.
Need to prove that in the automatic control constant-current circuit, all triodes in the voltage detecting and controling circuit can be replaced with metal-oxide-semiconductor in the present embodiment, the metal-oxide-semiconductor in the constant-current circuit can be replaced with triode.
A kind of LED constant-current circuit with the PWM dimming function that present embodiment provides, this LED constant-current circuit comprises LED lamp string, automatic control constant-current circuit, PWM light-adjusting module, only by changing the connected mode of components and parts and components and parts in the circuit, do not need extra other button that arranges to realize function, namely solved traditional LED constant current and driven cost height, light adjusting circuit complexity, problem that dimming scope is little.And this circuit carries overvoltage, overcurrent protection function, can detect when LED lamp string both end voltage raises and turn-off this branch road, can protect led light source not burnt out by overvoltage; Present embodiment has adopted the PWM light-adjusting module, regulates the brightness of LED lamp string by receiving outside PWM dim signal, makes the dimming scope of this circuit wide, and light modulation is reliable and stable.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (3)
1. the LED constant-current circuit with the PWM light modulation is characterized in that: comprise power supply, automatic control constant-current circuit, LED lamp string and PWM light-adjusting module; Described LED lamp string is connected with described automatic control constant-current circuit, and the circuit load that described LED lamp string and automatic control constant-current circuit are formed is connected between the positive pole and negative pole of power supply, and described PWM light-adjusting module is connected with the automatic control constant-current circuit.
2. the LED constant-current circuit of band according to claim 1 PWM light modulation, it is characterized in that: described automatic control constant-current circuit comprises a voltage detecting and controling circuit and a constant-current circuit; Described voltage detecting and controling circuit comprises voltage detecting and controling circuit triode, first divider resistance and second divider resistance; Described constant-current circuit comprises constant-current circuit metal-oxide-semiconductor, a current-limiting resistance, a current sense resistor and a constant-current circuit triode;
One end of first divider resistance and an end of second divider resistance are connected the base stage of voltage detecting and controling circuit triode simultaneously, the other end of first divider resistance connects the negative terminal of described LED lamp string, the other end of second divider resistance connects the negative pole of power supply, the collector electrode of voltage detecting and controling circuit triode connects the grid of constant-current circuit metal-oxide-semiconductor, and the emitter of voltage detecting and controling circuit triode connects the negative pole of power supply;
One end of the drain electrode of constant-current circuit metal-oxide-semiconductor and current-limiting resistance is connected the negative terminal of LED lamp string, one end of the source electrode of constant-current circuit metal-oxide-semiconductor and current sense resistor is connected the base stage of constant-current circuit triode simultaneously, and the grid of constant-current circuit metal-oxide-semiconductor connects the other end of current-limiting resistance, the collector electrode of voltage detecting and controling circuit triode and the collector electrode of constant-current circuit triode simultaneously;
The other end of current-limiting resistance connects the collector electrode of constant-current circuit triode and the collector electrode of voltage detecting and controling circuit triode, and the emitter of the other end of current sense resistor and constant-current circuit triode all is connected to the negative pole of power supply.
3. the LED constant-current circuit of band according to claim 2 PWM light modulation, it is characterized in that: described PWM light-adjusting module is provided with PWM light modulation port, and described PWM light modulation port is connected with described first divider resistance, second divider resistance and the base stage three's of voltage detecting and controling circuit triode junction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003556 CN203136242U (en) | 2013-01-05 | 2013-01-05 | LED constant-current circuit with PWM light modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003556 CN203136242U (en) | 2013-01-05 | 2013-01-05 | LED constant-current circuit with PWM light modulation |
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| Publication Number | Publication Date |
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| CN203136242U true CN203136242U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320003556 Expired - Fee Related CN203136242U (en) | 2013-01-05 | 2013-01-05 | LED constant-current circuit with PWM light modulation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796387A (en) * | 2013-12-27 | 2014-05-14 | 陈俞好 | LED drive device, battery charger and drive control circuit of LED drive device |
| CN104812142A (en) * | 2015-05-11 | 2015-07-29 | 王开 | Linear LED (Light-Emitting Diode) drive circuit of near sine wave with high power factor and low harmonic wave |
| CN105208706A (en) * | 2014-06-12 | 2015-12-30 | 欧普照明股份有限公司 | PWM dimming circuit for LED lamp |
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN110267392A (en) * | 2019-06-03 | 2019-09-20 | 苏州慧润百年物联科技有限公司 | A kind of circuit and method of achievable LED isolation stepless dimming |
-
2013
- 2013-01-05 CN CN 201320003556 patent/CN203136242U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796387A (en) * | 2013-12-27 | 2014-05-14 | 陈俞好 | LED drive device, battery charger and drive control circuit of LED drive device |
| CN105208706A (en) * | 2014-06-12 | 2015-12-30 | 欧普照明股份有限公司 | PWM dimming circuit for LED lamp |
| CN104812142A (en) * | 2015-05-11 | 2015-07-29 | 王开 | Linear LED (Light-Emitting Diode) drive circuit of near sine wave with high power factor and low harmonic wave |
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN110267392A (en) * | 2019-06-03 | 2019-09-20 | 苏州慧润百年物联科技有限公司 | A kind of circuit and method of achievable LED isolation stepless dimming |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: LED constant-current circuit with PWM light modulation Effective date of registration: 20140327 Granted publication date: 20130814 Pledgee: Guangdong Nanpu Leasing Co. Ltd. Pledgor: AD-Toyo Lighting (Guangzhou) Co., Ltd. Registration number: 2014440000004 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20160105 |