CN204669659U - LED constant-current control circuit and be provided with the LED lamp of this circuit - Google Patents
LED constant-current control circuit and be provided with the LED lamp of this circuit Download PDFInfo
- Publication number
- CN204669659U CN204669659U CN201520317723.4U CN201520317723U CN204669659U CN 204669659 U CN204669659 U CN 204669659U CN 201520317723 U CN201520317723 U CN 201520317723U CN 204669659 U CN204669659 U CN 204669659U
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- constant
- electrically connected
- led lamp
- 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.)
- Expired - Fee Related
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a kind of LED constant-current control circuit and be provided with the LED lamp of this circuit, wherein constant-current control circuit comprises AC-DC constant-current supply, LED lamp bead is serially connected with between the DC+ voltage end of AC-DC constant-current supply and DC-voltage end, also comprise the current sampling circuit for sampling AC-DC constant-current supply output current, current sampling circuit is electrically connected with described DC+ voltage end, current sampling circuit transmission sampling current is to the MCU circuit be connected electrically, MCU circuit exports PWM ripple to the switch be connected electrically, switch is also serially connected between current sampling circuit and LED lamp bead, MCU circuit is according to the sampling current received, export the PWM ripple of different duty to switch, control switch make-to-break ratio, make the output constant current of AC-DC constant-current supply.Use the LED lamp of circuit of the present utility model, there is long service life, reaction speed is fast, the advantage that cost is low, product quality is high and display effect is excellent.
Description
Technical field
The utility model relates to technical field of LED illumination, particularly relates to a kind of LED constant-current control circuit and is provided with the LED lamp of this circuit.
Background technology
LED (Light Emitting Diode, light-emitting diode) lamp throws light on popularization and application, for society brings huge energy-conservation contribution.LED light ratio traditional lighting can realize the illuminating effect of more high-quality, is widely used in room lighting, the every field such as outdoor lighting and commercial lighting.
At present, determine that the principal element in LED life-span is the heating that electric current causes, LED power supply main is on the market constant current output power supply.But these power supplies are when dispatching from the factory, and the shortcoming of the inconsistent and power source aging of ubiquity current precision, causes the problems such as curent change in use procedure is larger.The problems referred to above directly cause LED service life reduction, so that directly damage.Therefore in the use procedure of constant-current supply output current inconsistency, and constant-current supply, curent change is large, has become the technical problem underlying faced in the industry.
Utility model content
First object of the present utility model is to provide a kind of LED constant-current control circuit, and this LED constant-current control circuit in use, adjusts according to actual output current, thus makes the curent change flowing through LED little, and circuit structure is simple, and cost is low.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of LED constant-current control circuit comprises AC-DC constant-current supply, the input termination alternating current of described AC-DC constant-current supply, the output of described AC-DC constant-current supply comprises DC+ voltage end and DC-voltage end, LED lamp bead is serially connected with between described DC+ voltage end and described DC-voltage end, also comprise the current sampling circuit for sampling described AC-DC constant-current supply output current, the input of described current sampling circuit is electrically connected with described DC+ voltage end; Export the MCU circuit of PWM ripple according to the current sampling value gathering described current sampling circuit, described MCU circuit is electrically connected with the output of described current sampling circuit; For adjusting the switch of average current, described switch is electrically connected with the output of described MCU circuit, and described switch is also serially connected between described current sampling circuit and described LED lamp bead; Described MCU circuit is according to the sampling current value received, and the PWM ripple exporting different duty, to described switch, controls the make-to-break ratio of described switch, makes the output constant current of described AC-DC constant-current supply.
Optimal way is, described current sampling circuit is a resistance, and one end of described resistance is electrically connected with described DC+ voltage end, and the other end is electrically connected with described switch, and the two ends of described resistance are also electrically connected with described MCU circuit respectively.
Optimal way is, field effect transistor selected by described switch, and the grid of described field effect transistor is electrically connected with described MCU circuit, and the source electrode of described field effect transistor is electrically connected with described LED lamp bead, and the drain electrode of described field effect transistor is electrically connected with described current sampling circuit.
Second object of the present utility model is to provide a kind of LED lamp, and this LED lamp has long service life, cost is low, product quality is high advantage.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of LED lamp, described LED lamp comprises above-mentioned LED constant-current control circuit.
After adopting technique scheme, the beneficial effects of the utility model are: because LED constant-current control circuit of the present utility model comprises AC-DC constant-current supply, the input termination alternating current of AC-DC constant-current supply, AC-DC constant-current supply is from output output constant current, its output comprises DC+ voltage end and DC-voltage end, and is serially connected with LED lamp bead between DC+ voltage end and DC-voltage end.The utility model also comprises current sampling circuit, and the input of this current sampling circuit is electrically connected with DC+ voltage end, for sampling the current value that AC-DC constant-current supply exports; The current value of sampling is transferred to the MCU circuit be connected electrically by current sampling circuit from output.This MCU circuit is according to the current value received, and export the PWM ripple of different duty to switch, this switch series is connected between current sampling circuit and LED lamp bead.After current sampling circuit does not stop that the output current value of the AC-DC constant-current supply of sampling is transferred to MCU circuit, MCU circuit exports the PWM ripple of different duty to switch according to the actual current value received, switch is switched on or switched off according to the current value of the actual output of AC-DC constant-current supply, thus make the average current flowing through LED constant, and then improve LED useful life.And circuit structure of the present utility model is simple, thus reduce cost; Reaction speed simultaneously because of MCU circuit is fast, further ensures that to flow through the change of LED lamp bead average current little.Therefore use the LED lamp of LED constant-current control circuit of the present utility model, it has long service life, cost is low, product quality is high advantage.
Because current sampling circuit is a resistance, one end of resistance is electrically connected with DC+ voltage end, and the other end is electrically connected with switch, and the two ends of resistance are also electrically connected with MCU circuit respectively; This current sampling circuit further simplify circuit structure, reduces cost.
Because field effect transistor selected by switch, the grid of field effect transistor is electrically connected with MCU circuit, and the source electrode of field effect transistor is electrically connected with LED lamp bead, and the drain electrode of field effect transistor is electrically connected with current sampling circuit; Because the make-to-break ratio of field effect transistor is high, reaction speed is fast, thus makes the utility model optimize display effect.
In sum, LED constant-current control circuit of the present utility model, compared to prior art, solves the circuit structure complexity that adjustment AC-DC constant-current supply exports high-precision current, causes the technical problem that cost is high; LED constant-current control circuit of the present utility model adopts simple circuit structure, the current value that Real-time Collection constant-current supply exports, and export PWM ripple to switch by MCU circuit according to real-time current value, finally be switched on or switched off according to actual conditions by switch, thus make the average current value change flowing through LED lamp bead little.Because the simple cost of structure is low, reduce cost, improve efficiency and quality; And adopting LED constant current of the present utility model to control the LED lamp of electric current, its long service life, cost is low, regulates the speed fast.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model LED constant-current control circuit;
Fig. 2 is the circuit diagram of embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, a kind of LED constant-current control circuit comprises AC-DC constant-current supply, the input termination alternating current AC INPUT of AC-DC constant-current supply, be specially an input to start to exchange fire line L, another input terminal connecting zero line N, the output of AC-DC constant-current supply comprises DC+ voltage end and DC-voltage end, and is serially connected with LED lamp bead between DC+ voltage end and DC-voltage end.
The utility model also comprises current sampling circuit, and current sampling circuit is electrically connected with DC+ voltage end, samples the current value that AC-DC constant-current supply exports.The output of current sampling circuit is also electrically connected with MCU circuit, and the current value real-time Transmission making it sample is to MCU circuit.The output of MCU circuit is electrically connected with the control end of a switch S, and switch S is serially connected between current sampling circuit and LED lamp bead.MCU circuit of the present utility model, according to the sampling current value received, exports the PWM ripple of different duty to switch S.And the conversion of the high/low level of PWM ripple makes switch S be switched on or switched off, the break-make of switch S have adjusted the average current flowing through LED lamp bead, makes change little.
As shown in Figure 2, the current sampling circuit of the present embodiment is that one end of a resistance R, resistance R is electrically connected with DC+ voltage end, and the other end is electrically connected with switch S, the present embodiment switch S is preferably field effect transistor MOS, and namely the other end of resistance is connected with the drain electrode of field effect transistor MOS.The two ends of resistance R are also electrically connected with MCU circuit respectively, even if the voltage at resistance R two ends is collected by MCU circuit.The grid of field effect transistor MOS is electrically connected with MCU circuit, and the source electrode of field effect transistor MOS is electrically connected with LED lamp bead.
The present embodiment adopts and carries out independently feedback control loop at common AC-DC constant-current supply output, is gathered the current value of DC+ voltage end by MCU circuit by resistance R, judges the electric current that AC-DC constant-current supply exports according to the current value sampled.According to judged result MCU circuit output frequency and all adjustable PWM ripple of duty ratio to field effect transistor MOS; and then control opening or turning off of field effect transistor MOS; the average current finally realizing flowing through LED lamp bead maintains degree of precision all the time, thus plays the effect of protection LED lamp bead.
If MCU main circuit is according to Ohm's law, U=IR; I=U/R; MCU circuit judges the size of AC-DC constant-current supply output current according to the pressure drop at resistance R two ends; The break-make of field effect transistor MOS is controlled by exporting PWM ripple; utilize the intervention of the duty ratio (duty) of PWM ripple, namely I=U/R*duty controls electric current, prevents electric current excessive; thus protect LED, and too high electric current can be adjusted to stable constant current.
The above preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, etc. the improvement etc. of same LED constant-current control circuit structure, all should be included within protection range of the present utility model.
Claims (4)
1.LED constant-current control circuit, comprise AC-DC constant-current supply, the input termination alternating current of described AC-DC constant-current supply, the output of described AC-DC constant-current supply comprises DC+ voltage end and DC-voltage end, LED lamp bead is serially connected with between described DC+ voltage end and described DC-voltage end, it is characterized in that, also comprise
For sampling the current sampling circuit of described AC-DC constant-current supply output current, the input of described current sampling circuit is electrically connected with described DC+ voltage end;
Export the MCU circuit of PWM ripple according to the current sampling value gathering described current sampling circuit, described MCU circuit is electrically connected with the output of described current sampling circuit;
For adjusting the switch of average current, described switch is electrically connected with the output of described MCU circuit, and described switch is also serially connected between described current sampling circuit and described LED lamp bead; Described MCU circuit is according to the sampling current value received, and the PWM ripple exporting different duty, to described switch, controls the make-to-break ratio of described switch, makes the output constant current of described AC-DC constant-current supply.
2. LED constant-current control circuit according to claim 1, it is characterized in that, described current sampling circuit is a resistance, and one end of described resistance is electrically connected with described DC+ voltage end, the other end is electrically connected with described switch, and the two ends of described resistance are also electrically connected with described MCU circuit respectively.
3. LED constant-current control circuit according to claim 1 and 2, it is characterized in that, field effect transistor selected by described switch, the grid of described field effect transistor is electrically connected with described MCU circuit, the source electrode of described field effect transistor is electrically connected with described LED lamp bead, and the drain electrode of described field effect transistor is electrically connected with described current sampling circuit.
4. a LED lamp, is characterized in that, described LED lamp comprises the LED constant-current control circuit described in any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520317723.4U CN204669659U (en) | 2015-05-16 | 2015-05-16 | LED constant-current control circuit and be provided with the LED lamp of this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520317723.4U CN204669659U (en) | 2015-05-16 | 2015-05-16 | LED constant-current control circuit and be provided with the LED lamp of this circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204669659U true CN204669659U (en) | 2015-09-23 |
Family
ID=54139995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520317723.4U Expired - Fee Related CN204669659U (en) | 2015-05-16 | 2015-05-16 | LED constant-current control circuit and be provided with the LED lamp of this circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204669659U (en) |
-
2015
- 2015-05-16 CN CN201520317723.4U patent/CN204669659U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104427688B (en) | LED alternating-current drive circuit | |
| CN101657057B (en) | LED power circuit | |
| CN103298221B (en) | Dimming circuit and method of LED (Light Emitting Diode) lighting lamp | |
| CN202721866U (en) | New type driving circuit which is compatible with LED lamp tube | |
| CN102573213B (en) | LED (Light Emitting Diode) dimming system | |
| CN103139992A (en) | Light-emitting diode (LED) dimming driving system with silicon controlled bypass dimming circuit | |
| CN201663735U (en) | LED power supply | |
| CN102821526B (en) | The circuit of LED electrical pressure adaptive PWM light modulation is realized under constant-current source pre-driver | |
| CN201657400U (en) | LED dimming controller | |
| CN203942687U (en) | A kind of isolated form constant-current dimming circuit | |
| CN201846509U (en) | LED switch dimming power source | |
| CN201742607U (en) | LED dimming system | |
| CN203181303U (en) | Light modulator used for voltage drop dimming light fixture | |
| CN204069410U (en) | Two-wire system light adjusting circuit | |
| CN103702495B (en) | A kind of linear LED drive circuit based on AC-powered | |
| CN204669659U (en) | LED constant-current control circuit and be provided with the LED lamp of this circuit | |
| CN105611672A (en) | Light emitting diode (LED) driving circuit compatible with silicon controlled rectifier dimmer | |
| CN202603011U (en) | Energy-saving control system for light-emitting diode (LED) indoor illumination | |
| CN202634833U (en) | Diming circuit for light-emitting diode (LED) lamp | |
| CN204539551U (en) | The switch dimming drive circuit of narrow voltage LED and LED dimming control system | |
| CN204539556U (en) | The switch dimming drive circuit of Width funtion LED and LED dimming control system | |
| CN203340367U (en) | Light modulation circuit for LED illuminating lamp | |
| CN200947591Y (en) | Single input automatic light-tuning electronic switch | |
| CN210202143U (en) | LED constant-current and overvoltage control circuit and LED lamp | |
| CN204993992U (en) | Intelligence switch light modulation control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150923 Termination date: 20200516 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |