CN201805598U - LED (light-emitting diode) constant current drive control circuit - Google Patents
LED (light-emitting diode) constant current drive control circuit Download PDFInfo
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- CN201805598U CN201805598U CN2010205503023U CN201020550302U CN201805598U CN 201805598 U CN201805598 U CN 201805598U CN 2010205503023 U CN2010205503023 U CN 2010205503023U CN 201020550302 U CN201020550302 U CN 201020550302U CN 201805598 U CN201805598 U CN 201805598U
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- led
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Abstract
The utility model relates to an LED (light-emitting diode) constant current drive control circuit which comprises a drive integrated circuit (IC) and is characterized in that the IC comprises a linear dimming control end, a drive external MOS (metal oxide semiconductor) pipe grid end and a load current sampling feedback end, wherein the drive external MOS pipe grid end is connected with an MOS pipe grid; a drain of the MOS pipe is electrically connected with an LED light module; a source of the MOS pipe is electrically connected with the load current sampling feedback end; and the linear dimming control end is connected with a resistance regulation unit. The circuit can be directly applied to electric supply garden lamps, LED bulbs, fluorescent lamps, tube lights, reflector lamps, board lamps, and desk lamps and the like; the power supply efficiency achieves more than 85 percent with constant current and without voltage reduction; when the power supply voltage changes between plus 10 percent and minus10 percent, the current change is not more than 3 percent, and the LED is stable and reliable in work and long in service life.
Description
Technical field
The utility model relates to a kind of LED constant-current driving control circuit.
Background technology
The LED lighting source possesses advantages such as luminous efficiency height, volume is little, the life-span is long, so it has the trend of extensive use, traditional LED lighting circuit typically uses the DC driven mode, its input voltage range is narrow, to be depressured to 5V ~ 30V by transformer, so not only increased the volume of drive circuit, and drive current is little, instability is quickened LED easily and is worn out, and increases circuit loss, shorten the working life of LED, therefore, develop and a kind ofly can be directly used in civil power, the stable drive circuit of drive current is very important.
Summary of the invention
The purpose of this utility model provides a kind of LED constant-current driving control circuit, can directly apply to civil power without step-down, and volume is little, and cost is low.
For achieving the above object, the utility model adopts following scheme to realize: a kind of LED constant-current driving control circuit, comprise a drive IC, it is characterized in that: described IC comprises that a linearity light adjusting control end, drives external metal-oxide-semiconductor gate terminal and load current sampling feedback end; The external metal-oxide-semiconductor gate terminal of described driving connects a metal-oxide-semiconductor grid, and the drain electrode of described metal-oxide-semiconductor and a LED lamp module electrically connect; The source electrode of described metal-oxide-semiconductor and load current sampling feedback end electrically connect; Described linearity light adjusting control end is connected with resistance value regulation and control unit.
The utility model can directly apply to civil power garden lamp, LED bulb lamp, fluorescent lamp, Down lamp, shot-light, plate lamp, desk lamp etc., without voltage dropping power supply efficient up to more than 90%, and constant current; When mains voltage variations ± 10% the time, electric current changes≤3%.Make LED working stability q-percentile life long.Entire circuit uses part few, and the low volume of cost is little, is a kind of LED municipal power constant current driver module circuit that is worthy to be popularized.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model.
Fig. 2 is the internal circuit principle schematic of the utility model drive IC.
Fig. 3 is embodiment one a 110/220V AC applications LED lamp drive circuit schematic diagram.
But Fig. 4 is the LED lamp drive circuit of embodiment two linearity light adjustings.
Fig. 5 is the LED display driver circuit of embodiment three digit control light modulations.
Fig. 6 is the circuit topology schematic diagram that embodiment four low pressure drop die moulds are used.
Fig. 7 is embodiment five low voltage rise type application circuit topology schematic diagrames.
Fig. 8 is embodiment six constant-current source circuit schematic diagrames.
In the accompanying drawing:
GND:IC ground connection, power cathode;
EN: Enable Pin, high level are effective;
LD: linearity light adjusting control end;
FS: start the time-delay control end;
GATE: drive external metal-oxide-semiconductor grid;
CS: load current sampling feedback end;
TOFF: the turn-off time is provided with;
The VDD:IC positive source.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.
As shown in Figure 1, the utility model provides a kind of LED constant-current driving control circuit, comprises a drive IC, it is characterized in that: described IC comprises that a linearity light adjusting control end, drives external metal-oxide-semiconductor gate terminal and load current sampling feedback end; The external metal-oxide-semiconductor gate terminal of described driving connects a metal-oxide-semiconductor grid, and the drain electrode of described metal-oxide-semiconductor and a LED lamp module electrically connect; The source electrode of described metal-oxide-semiconductor and load current sampling feedback end electrically connect; Described linearity light adjusting control end is connected with resistance value regulation and control unit.Please refer to Fig. 2, Fig. 2 is described drive IC internal circuit principle schematic, and as we know from the figure, this drive IC is by linear, frequency adjustment Control current.This IC has in the time of regulating LED lamp module switch lamp by the external capacitor size voltage time-delay control end of climbing speed gradually.According to the characteristic of IC, when design circuit of the present utility model, we can sum up following circuit design and require:
The setting of l, constant current value:
When adopting buck topology, the average current among the LED is directly proportional with the Rcs pressure drop, but must consider the error of inductive current mean value and peak current.When for example inductance ripple current peak value is 100mA, obtain the LED electric current of 350mA, sample resistance Rcs should choose: Rcs=300mV/ (350mA+0.5*100mA)=0.75
2, selecting for use of MOSFET:
Under the 220Vac electric power thus supplied, generally require withstand voltage more than 600V.The electric current of MOSFET should select more than 5 times of operating current.Internal resistance should be less than 0.5
3, determining of operating frequency:
Operating frequency is set by being connected on the TOFF pin resistance and electric capacity, and resistance connects
End, resistance is more little, and frequency is high more, and electric capacity is big more, and frequency is low more.The operating frequency height should determine that operating frequency is high more according to actual conditions, and inductance is more little, and cost is low more.
4, the selection of inductance:
In classic applications, ripple current is chosen for 30% of normal LED electric current, for example
=350mA, 60 ultra-high brightness LEDs are composed in series, and each LED forward voltage drop is 3.2V, then the total voltage of LED string
=l 92V, input
Vin=220V*=310V can the compute switch duty ratio be: D=thus
/ Vin=192/310=0.62
When operating frequency is 100KHz, ask during the conducting of MOGFET to be Ton=D/fosc=0.62/100KHz=6.2ms
Inductance value is: L=(Vin-
) Ton/0.3
=(310-192)*6.2/0.3*350
=6.97mH
5, light modulation:
There are three kinds of modes can control light modulation, depend on different application.Light modulation light modulation also capable of being combined separately.
Basic light modulation: by changing sample resistance Rcs light modulation, the more little brightness of Rcs is high more, but limited by the people of the LED electric current of working.
Linearity light adjusting: by regulating LD pin voltage from 0 to 300mV, thereby can change output current, realize light modulation, surpass 300mV and will no longer increase the LED electric current.The output current bigger as needs can be selected a littler sample resistance Rcs, but limited by the LED maximum operating currenbt.
The pulse width modulation light modulation: inject the EN pin by external PWM signal, with " 0 " of this signal, electric current that " 1 " makes the LED that flows through be 0 or the normal electrical flow valuve set of sample resistance Rcs realize light modulation.Dimming scope can only be in the scope that Rcs sets from 0 to 100%, and the light modulation precision is decided by the minimum pulse width restriction of GATE.Be the percentage of operating frequency and duty ratio.Pwm signal can be realized light modulation by the luminosity grade of hope by computer, micro controller or pulse generator.
6, Enable Pin EN:EN pin ground connection, circuit is in resting state.When the EN pin connects
The time, circuit is in normal operating conditions.
The speed that voltage rose gradually when 7, soft start function: FS end can be regulated LED lamp string and turns on light by the external capacitor size, the surge voltage of avoiding starting shooting is damaged LED lamp string.
According to above-mentioned requirement, the utility model proposes six kinds of circuit topology figure of Fig. 3 ~ Fig. 8.Wherein said LED lamp module is several LED lamp series connection, and the input of this Series lamp string is serially connected with an inductance.
In light adjusting circuit, as shown in Figure 4 and Figure 5, described resistance value regulation and control unit is an adjustable rheostat or the adjustable rheostat of a numerical control.In addition, the circuit that is designed by described IC also can be used as constant-current source, as shown in Figure 8.
The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (5)
1. a LED constant-current driving control circuit comprises a drive IC, it is characterized in that: described IC comprises that a linearity light adjusting control end, drives external metal-oxide-semiconductor gate terminal and load current sampling feedback end; The external metal-oxide-semiconductor gate terminal of described driving connects a metal-oxide-semiconductor grid, and the drain electrode of described metal-oxide-semiconductor and a LED lamp module electrically connect; The source electrode of described metal-oxide-semiconductor and load current sampling feedback end electrically connect; Described linearity light adjusting control end is connected with resistance value regulation and control unit.
2. LED constant-current driving control circuit according to claim 1 is characterized in that: described resistance value regulation and control unit is an adjustable rheostat.
3. LED constant-current driving control circuit according to claim 1 is characterized in that: described resistance value regulation and control unit is the adjustable rheostat of a numerical control.
4. LED constant-current driving control circuit according to claim 1 is characterized in that: described IC has in the time of regulating LED lamp module switch lamp by the external capacitor size voltage time-delay control end of climbing speed gradually.
5. LED constant-current driving control circuit according to claim 1 is characterized in that: described LED lamp module is to be composed in series by one or several LED lamps, and the input of this Series lamp string is serially connected with an inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205503023U CN201805598U (en) | 2010-09-30 | 2010-09-30 | LED (light-emitting diode) constant current drive control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205503023U CN201805598U (en) | 2010-09-30 | 2010-09-30 | LED (light-emitting diode) constant current drive control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201805598U true CN201805598U (en) | 2011-04-20 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205503023U Expired - Lifetime CN201805598U (en) | 2010-09-30 | 2010-09-30 | LED (light-emitting diode) constant current drive control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201805598U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135790A (en) * | 2014-06-11 | 2014-11-05 | 普诚科技（深圳）有限公司 | LED (Light-emitting Diode) dimming control circuit |
| CN105307307A (en) * | 2015-12-02 | 2016-02-03 | 东莞芯成电子科技有限公司 | LED dimming system |
-
2010
- 2010-09-30 CN CN2010205503023U patent/CN201805598U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135790A (en) * | 2014-06-11 | 2014-11-05 | 普诚科技（深圳）有限公司 | LED (Light-emitting Diode) dimming control circuit |
| CN105307307A (en) * | 2015-12-02 | 2016-02-03 | 东莞芯成电子科技有限公司 | LED dimming system |
| CN105307307B (en) * | 2015-12-02 | 2017-04-12 | 东莞芯成电子科技有限公司 | LED dimming system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: FUJIAN NANPING SANJIN ELECTRONICS CO., LTD. Free format text: FORMER OWNER: NING LIHUA Effective date: 20110608 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20110608 Address after: 353000 No. 5, Changxin Road, Changsha hi tech Development Zone, Fujian, Nanping Patentee after: FUJIAN NANPING SANJIN ELECTRONICS CO., LTD. Address before: 353000 No. 5, Changxin Road, Changsha hi tech Development Zone, Fujian, Nanping Patentee before: Ning Lihua |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110420 |
|
| CX01 | Expiry of patent term |