CN104684185A - LED (light emitting diode) lighting circuit - Google Patents
LED (light emitting diode) lighting circuit Download PDFInfo
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- CN104684185A CN104684185A CN201310642279.9A CN201310642279A CN104684185A CN 104684185 A CN104684185 A CN 104684185A CN 201310642279 A CN201310642279 A CN 201310642279A CN 104684185 A CN104684185 A CN 104684185A
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- pin
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Abstract
The invention discloses an LED (light emitting diode) lighting circuit. The LED lighting circuit comprises a voltage generation unit, a current generation unit, a control signal generation unit and an LED branch, wherein the LED branch comprises at least one LED, the voltage generation unit is used for generating a working voltage and outputting the working voltage to the LED branch, the current generation unit is used for generating a drive current to drive the LED branch, the control signal generation unit is used for generating a control signal and outputting the control signal to the current generation unit, and the current generation unit is used for adjusting the drive current under the control of the control signal. By implementing the LED lighting circuit, a technical effect for improving the LED luminescent property and prolonging the service life of the LED can be achieved.
Description
Technical field
The present invention relates to electronic circuit technology field, especially relate to a kind of light-emitting diode (light emitting diode, LED) lighting circuit.
Background technology
At present, LED due to its life-span long, the advantage such as high and good reliability of switching speed and being widely used.Such as, LED is typically used as indicator light, the backlight of display, exterior decoration etc.LED is a kind of current driven light-emitting element, for various reasons, existing LED illumination circuit usually can not be operated in suitable operating current under.If under LED is operated in inappropriate operating current, then can cause certain influence to the luminescent properties of LED, in addition, if LED operating current is excessive, then can burn out LED, thus cause the useful life of LED illumination circuit shorter.
Summary of the invention
Therefore, be necessary to provide a kind of luminescent properties better and useful life longer LED illumination circuit.
A kind of LED illumination circuit, described LED illumination circuit comprises voltage generating unit, current generating unit, control signal generation unit and LED branch road, described LED branch road at least comprises a LED, described voltage generating unit is for generation of an operating voltage, and export described operating voltage to described LED branch road, described current generating unit is for generation of a drive current, to drive described LED branch road, described control signal generation unit is for generation of a control signal, and export described control signal to described current generating unit, described current generating unit is used for the size adjusting described drive current under the control of said control signal.
Preferably, described control signal is pulse width modulating signal, by adjusting the duty ratio of described pulse width modulating signal to adjust the size of described drive current.
Preferably, when the duty ratio of described pulse width modulating signal increases, described drive current increases; When the duty ratio of described pulse width modulating signal reduces, described drive current reduces.
Preferably, described control signal generation unit comprises a control signal and produces chip, first resistance and the second resistance, described control signal produces chip and coordinates described first resistance and described second resistance, to produce described pulse width modulating signal, it is ICM7555 integrated chip that described control signal produces chip, described ICM7555 integrated chip comprises power pins, electric discharge pin, thresholding pin and output pin, described first resistance one end connects described power pins, the other end of described first resistance connects described second resistance to described thresholding pin, described electric discharge pin is connected to the node between described first resistance and described second resistance, by adjusting the resistance value of described first resistance and described second resistance to adjust the duty ratio of described pulse width modulating signal, described output pin is for exporting described pulse width modulating signal, wherein, described power pins, described electric discharge pin, described thresholding pin and described output pin are respectively the 8th pin of described ICM7555 integrated chip, 7th pin, 6th pin and the 3rd pin.
Preferably, described control signal generation unit also comprises one first electric capacity, described ICM7555 integrated chip also comprises a trigger pin and a grounding pin, described trigger pin is for receiving a triggering signal to trigger the work of described ICM7555 integrated chip, described grounding pin ground connection, one end ground connection of described first electric capacity, the other end of described first electric capacity connects described trigger pin, and described trigger pin connects described thresholding pin, described first electric capacity and described first resistance and described second resistance coordinate with the frequency adjusting described pulse width modulating signal.
Preferably, described current generating unit comprises an electric current and produces chip, it is MBI1801 integrated chip that described electric current produces chip, described MBI1801 integrated chip comprises a reference resistance pin and an enable pin, described reference resistance pin connects a reference resistance, the resistance value of the described reference resistance of described modulation is to adjust the size of described drive current, and described enable pin is for receiving described control signal.
Preferably, described LED illumination circuit also comprises a divider resistance, and described divider resistance is connected between described voltage generating unit and described LED branch road, and described divider resistance is for reducing via the voltage being carried in described current generating unit after described LED branch road.
Preferably, described LED illumination circuit also comprises a protected location, and the drive current that described protected location is used for described LED branch road disconnects more than during a pre-set current value, to cut off the path between described LED branch road and described voltage generating unit.
Preferably, described LED illumination circuit also comprises one first filter capacitor, and described first filter capacitor is for eliminating the clutter in described operating voltage.
Preferably, described LED illumination circuit also comprises one second filter capacitor, and described second filter capacitor connects one end and connects described divider resistance, other end ground connection.
Crossing with prior art, LED illumination circuit 100 of the present invention adjusts the size of the drive current of described LED branch road 140 by the control signal that control signal generation unit 120 produces.Thus under described LED can be made can be operated in more suitable drive current.Thus reach raising LED luminescent properties and the technique effect in useful life.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electrical block diagram of LED illumination circuit one better embodiment of the present invention.
Fig. 2 is the electrical block diagram of the control signal generation unit shown in Fig. 1.
Main element symbol description
LED illumination circuit 100
Voltage generating unit 110
Control signal generation unit 120
Current generating unit 130
LED branch road 140
Protected location 150
Voltage output end 111
Control signal output 120a
Operating voltage receiving terminal 120b
Control signal produces chip 121
Reference voltage receiving terminal 130a
Current output terminal 130b
Control signal receiving terminal 130c
First resistance Ra
Second resistance Rb
First filter capacitor C1
Second filter capacitor C2
Electric capacity of voltage regulation C3
First electric capacity C4
Electric current produces chip 131
Voltage-stabiliser tube ZD1
Divider resistance R1
Pull-up resistor R2
Reference resistance R3
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, it is the electrical block diagram of LED illumination circuit one better embodiment of the present invention.Described LED illumination circuit 100 comprises voltage generating unit 110, control signal generation unit 120, current generating unit 130 and LED branch road 140.Described LED branch road 140 comprises at least one LED.Described voltage generating unit 110 comprises a voltage output end 111.Described voltage produces reaction 110 for generation of an operating voltage, and described operating voltage is exported via described voltage output end 111.Described current generating unit 130 for generation of a drive current, to drive described LED branch road 140.Described control signal generation unit 130 for generation of a control signal, and exports described control signal to described current generating unit, and described current generating unit is used for the size adjusting the described drive current that it exports under the control of said control signal.
In the present embodiment, described LED branch road 140 comprises the LED of 3 series connection.Understandably, in other embodiments, the number of the LED comprised in described LED branch road 140 is not limited only to three, and described LED is not limited only to the form of series connection, also can be that multiple LED parallel connection forms described LED branch road 140.
See also Fig. 2, the electrical block diagram of the control signal generation unit shown in its Fig. 1.Described control signal generation unit 120 comprises control signal output 120a and operating voltage receiving terminal 120b.Described operating voltage receiving terminal 120b, for receiving a voltage, produces reaction 120 to drive described control signal and works.Described control signal output 120a is for exporting described drive current.
Described control signal generation unit 120 also comprises control signal and produces chip 121, first resistance Ra, the second resistance Rb and the first electric capacity C4.Described control signal produces chip 121 and coordinates described first resistance Ra and described second resistance Rb, to produce pulse width modulating signal (Pulse Width Modulation, PWM).Described pulse width modulating signal adjusts the size of described drive current as control signal.Particularly, by adjusting the duty ratio (duty) of described pulse width modulating signal to adjust the size of described drive current.Particularly, when the duty ratio of described pulse width modulating signal increases, described drive current increases; When the duty ratio of described pulse width modulating signal reduces, described drive current reduces.
In the present embodiment, it is ICM7555 integrated chip that described control signal produces chip 121, described ICM7555 integrated chip comprises grounding pin GND, trigger pin TRIG, output pin OUT, replacement pin RESET, power pins V+, electric discharge pin DIS, thresholding pin TH and control pin CONVOL.And described grounding pin GND, described trigger pin TRIG, described output pin OUT, described replacement pin RESET, described power pins V+, described electric discharge pin DIS, described thresholding pin TH and described control pin CONVOL are respectively the first pin of described ICM7555 integrated chip, the second pin, the 3rd pin, the 4th pin, the 5th pin, the 6th pin, the 7th pin and the 8th pin.The function of each pin described does not repeat them here.Described power pins V+ connects described operating voltage receiving terminal 120b, to be received from the voltage that described operating voltage receiving terminal 120b receives, to drive the work of described ICM7555 integrated chip.One end of described first resistance Ra connects described power pins V+, and the other end of described first resistance Ra connects described second resistance Rb to described thresholding pin TH.Described electric discharge pin DIS connects the node between described first resistance Ra and described second resistance Rb.By adjusting the resistance value of described first resistance Ra and described second resistance Rb to adjust the duty ratio of described pulse width modulating signal.For convenience of describing, the duty ratio of described pulse width modulating signal is designated as D, D=R
2/ (R
1+ 2R
2).Wherein, R
1it is the resistance value of the first resistance Ra; R
2it is the resistance value of the second resistance Rb.Described output pin OUT is for exporting described pulse width modulating signal.Described output pin OUT connects described control signal output 120a, for being exported via described control signal output pin 120a by described pulse width modulating signal.
Described control signal generation unit 120 also comprises one first electric capacity C4.Described first electric capacity C4 one end ground connection, the other end of described first electric capacity C4 connects described trigger pin TRIG.And described trigger pin TRIG connects described thresholding pin TH.Described first electric capacity C4 and described first resistance Ra and described second resistance Rb coordinates with the frequency adjusting described pulse width modulating signal.Particularly, the frequency of described pulse width modulating signal is designated as f, then f=1.46/ [(R
1+ 2R
2) * C], wherein C is the capacitance of described first electric capacity C4.
Please again consult Fig. 1, described current generating unit 130 comprises reference voltage receiving terminal 130a, current output terminal 130b and control signal receiving terminal 130c.Described reference voltage receiving terminal 130a is for receiving described operating voltage, and described control signal receiving terminal 130c for receiving described pulse width modulating signal as control signal, and adjusts the size of the drive current that it exports under the control of said control signal.Described current output terminal 130b is for exporting described drive current.
Particularly, described current generating unit 130 comprises electric current generation chip 131, pull-up resistor R2, voltage-stabiliser tube ZD1, electric capacity of voltage regulation C3 and reference resistance R3.It is MBI1801 integrated chip that described electric current produces chip 131, and described MBI1801 integrated chip comprises reference resistance pin REXT, enable pin OE, power pins VDD, grounding pin GND and output pin OUT.Described reference resistance pin REXT connects described reference resistance R3, can be adjusted the size of described drive current by the resistance value adjusting described reference resistance R3.Described enable pin OE connects described control signal receiving terminal 130c, for receiving described pulse width modulating signal as control signal.
Described pull-up resistor R2 one end connects described reference voltage receiving terminal 130a, and the other end connects the negative pole of described voltage-stabiliser tube ZD1, the plus earth of described voltage-stabiliser tube ZD1.And the negative pole of described voltage-stabiliser tube ZD1 connects the described operating voltage receiving terminal 120b of described control signal generation unit 120.Described power pins VDD connects the negative pole of described voltage-stabiliser tube ZD1.The voltage that described voltage-stabiliser tube ZD1 keeps certain for making described power pins VDD.Described electric capacity of voltage regulation C3 is in parallel with described voltage-stabiliser tube ZD1, that is, described electric capacity of voltage regulation C3 one end connects the negative pole of described voltage-stabiliser tube ZD1, and the other end of described electric capacity of voltage regulation C3 connects the positive pole of described voltage-stabiliser tube ZD1.
Described LED illumination circuit 100 also comprises the first filter capacitor C1, the second filter capacitor C2, divider resistance R1 and protected location 150.Described first filter capacitor C1 one end connects described voltage output end 111, other end ground connection.Described first filter capacitor is for eliminating the clutter in described operating voltage.Described protected location connects 150 and is connected between described voltage generating unit 110 and described LED branch road 140; for disconnecting more than during a pre-set current value when the drive current on described LED branch road 140, to cut off the path between described LED branch road and described voltage generating unit 110.Preferably, described protected location 150 is a semistor.Described second filter capacitor C2 one end connects described protected location 150, other end ground connection.Described divider resistance R1 one end connects the node of described protected location 150 and described second filter capacitor C2, and the other end of described divider resistance R1 connects described LED branch road 140.In other words, described divider resistance R1 also can regard as and be connected between described voltage generating unit 110 and described LED branch road 140.Described divider resistance R1 is for reducing via the voltage being carried in described current generating unit 130 after described LED branch road.In the present embodiment, described divider resistance R1 reduces the voltage that described electric current produces the described current output terminal 130b of reaction 130.During to avoid the overtension of described current output terminal 130b, the described electric current in described current generating unit 130 produces the overtension of chip 131 and the heat that produces is too high.
Crossing with prior art, LED illumination circuit 100 of the present invention adjusts the size of the drive current of described LED branch road 140 by the control signal that control signal generation unit 120 produces.Thus under described LED can be made can be operated in more suitable drive current.Thus reach raising LED luminescent properties and the technique effect in useful life.
Above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not depart from the spirit and scope of technical solution of the present invention.
Claims (10)
1. a LED illumination circuit, it is characterized in that, described LED illumination circuit comprises voltage generating unit, current generating unit, control signal generation unit and LED branch road, described LED branch road at least comprises a LED, described voltage generating unit is for generation of an operating voltage, and export described operating voltage to described LED branch road, described current generating unit is for generation of a drive current, to drive described LED branch road, described control signal generation unit is for generation of a control signal, and export described control signal to described current generating unit, described current generating unit is used for the size adjusting described drive current under the control of said control signal.
2. LED illumination circuit as claimed in claim 1, it is characterized in that, described control signal is pulse width modulating signal, by adjusting the duty ratio of described pulse width modulating signal to adjust the size of described drive current.
3. LED illumination circuit as claimed in claim 2, is characterized in that, when the duty ratio of described pulse width modulating signal increases, described drive current increases; When the duty ratio of described pulse width modulating signal reduces, described drive current reduces.
4. LED illumination circuit as claimed in claim 3, it is characterized in that, described control signal generation unit comprises a control signal and produces chip, first resistance and the second resistance, described control signal produces chip and coordinates described first resistance and described second resistance, to produce described pulse width modulating signal, it is ICM7555 integrated chip that described control signal produces chip, described ICM7555 integrated chip comprises power pins, electric discharge pin, thresholding pin and output pin, described first resistance one end connects described power pins, the other end of described first resistance connects described second resistance to described thresholding pin, described electric discharge pin is connected to the node between described first resistance and described second resistance, by adjusting the resistance value of described first resistance and described second resistance to adjust the duty ratio of described pulse width modulating signal, described output pin is for exporting described pulse width modulating signal, wherein, described power pins, described electric discharge pin, described thresholding pin and described output pin are respectively the 8th pin of described ICM7555 integrated chip, 7th pin, 6th pin and the 3rd pin.
5. LED illumination circuit as claimed in claim 5, it is characterized in that, described control signal generation unit also comprises one first electric capacity, described ICM7555 integrated chip also comprises a trigger pin and a grounding pin, described trigger pin is for receiving a triggering signal to trigger the work of described ICM7555 integrated chip, described grounding pin ground connection, one end ground connection of described first electric capacity, the other end of described first electric capacity connects described trigger pin, and described trigger pin connects described thresholding pin, described first electric capacity and described first resistance and described second resistance coordinate with the frequency adjusting described pulse width modulating signal.
6. the LED illumination circuit as described in Claims 1 to 5 item any one, it is characterized in that, described current generating unit comprises an electric current and produces chip, it is MBI1801 integrated chip that described electric current produces chip, described MBI1801 integrated chip comprises a reference resistance pin and an enable pin, described reference resistance pin connects a reference resistance, and the resistance value of the described reference resistance of described modulation is to adjust the size of described drive current, and described enable pin is for receiving described control signal.
7. LED illumination circuit as claimed in claim 1, it is characterized in that, described LED illumination circuit also comprises a divider resistance, described divider resistance is connected between described voltage generating unit and described LED branch road, and described divider resistance is for reducing via the voltage being carried in described current generating unit after described LED branch road.
8. LED illumination circuit as claimed in claim 7; it is characterized in that; described LED illumination circuit also comprises a protected location; the drive current that described protected location is used for described LED branch road disconnects more than during a pre-set current value, to cut off the path between described LED branch road and described voltage generating unit.
9. LED illumination circuit as claimed in claim 8, it is characterized in that, described LED illumination circuit also comprises one first filter capacitor, and described first filter capacitor is for eliminating the clutter in described operating voltage.
10. LED illumination circuit as claimed in claim 9, it is characterized in that, described LED illumination circuit also comprises one second filter capacitor, and described second filter capacitor connects one end and connects described divider resistance, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310642279.9A CN104684185A (en) | 2013-12-03 | 2013-12-03 | LED (light emitting diode) lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310642279.9A CN104684185A (en) | 2013-12-03 | 2013-12-03 | LED (light emitting diode) lighting circuit |
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| CN104684185A true CN104684185A (en) | 2015-06-03 |
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| CN201310642279.9A Pending CN104684185A (en) | 2013-12-03 | 2013-12-03 | LED (light emitting diode) lighting circuit |
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| CN201663735U (en) * | 2010-01-06 | 2010-12-01 | 深圳市爱能科技有限公司 | LED power supply |
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| CN201893977U (en) * | 2010-12-07 | 2011-07-06 | 上虞力得电器有限公司 | Light emitting diode (LED) dimming circuit |
| CN102256066A (en) * | 2011-01-17 | 2011-11-23 | 深圳市保千里电子有限公司 | Infrared high speed ball and method for intelligently adjusting brightness of infrared lamp by infrared high speed ball |
| CN102762011A (en) * | 2011-04-29 | 2012-10-31 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) constant-current dimming drive circuit device |
| CN203233576U (en) * | 2013-04-15 | 2013-10-09 | 浙江生辉照明有限公司 | Drive circuit of LED lighting device |
-
2013
- 2013-12-03 CN CN201310642279.9A patent/CN104684185A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201462730U (en) * | 2009-07-28 | 2010-05-12 | 京东方科技集团股份有限公司 | Illuminating lamp |
| CN201663735U (en) * | 2010-01-06 | 2010-12-01 | 深圳市爱能科技有限公司 | LED power supply |
| CN102004122A (en) * | 2010-10-21 | 2011-04-06 | 西北工业大学 | Alcohol detection alarm device |
| CN201893977U (en) * | 2010-12-07 | 2011-07-06 | 上虞力得电器有限公司 | Light emitting diode (LED) dimming circuit |
| CN102256066A (en) * | 2011-01-17 | 2011-11-23 | 深圳市保千里电子有限公司 | Infrared high speed ball and method for intelligently adjusting brightness of infrared lamp by infrared high speed ball |
| CN102762011A (en) * | 2011-04-29 | 2012-10-31 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) constant-current dimming drive circuit device |
| CN203233576U (en) * | 2013-04-15 | 2013-10-09 | 浙江生辉照明有限公司 | Drive circuit of LED lighting device |
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