CN102026435A - Light emitting diode driving circuit - Google Patents
Light emitting diode driving circuit Download PDFInfo
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- CN102026435A CN102026435A CN200910306840XA CN200910306840A CN102026435A CN 102026435 A CN102026435 A CN 102026435A CN 200910306840X A CN200910306840X A CN 200910306840XA CN 200910306840 A CN200910306840 A CN 200910306840A CN 102026435 A CN102026435 A CN 102026435A
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Abstract
The invention relates to a light emitting diode driving circuit with adjustable output current, which comprises a pulse-width modulation control chip, an input unit and an output unit, wherein a PWM-D (Pulse Width Modulation-Digital) pin of the pulse-width modulation control chip is electrically connected with a pulse-width modulation signal, a slide end of a slide theostat arranged in the input unit is electrically connected with an LIN-D (Linear-Digital) pin of the pulse-width modulation control chip, a source electrode of N groove reinforcing type MOSFETs (Metal-Oxide -Semiconductor Field Effect Transistors) arranged in the output unit is electrically connected with an ISEN pin of the pulse-width modulation control chip through a second resistor, a drain electrode is electrically connected with one end of an inductor and a positive electrode of a fast diode, a first capacitor is electrically connected between the other end of the inductor and the negative electrode of the fast diode, and both ends of the first capacitor are output ends of the light emitting diode driving circuit and are electrically connected with a light emitting diode module for driving the light emitting diode module.
Description
Technical field
The present invention relates to a kind of LED driving circuit, relate in particular to the adjustable LED driving circuit of a kind of output current.
Background technology
Along with the progress of development of science and technology and society, the kind of electronic product is more and more, and the degree of integration of the integrated circuit in the electronic product is also more and more higher.And most electronic products need apply a stable DC voltage so that its work to it.
LED driving circuit is mainly used to the direct voltage of input is done the adjusting of voltage level, and make it be stabilized in a magnitude of voltage that sets, it utilizes the switching that drives Shang Qiao and following bridge power component and produces pulse wave, producing galvanic current behind the low pass filter that this pulse wave process inductance capacitance is formed presses, to supply with various electronic products, specifically see also " HIGH INPUT VOLTAGE STEP-DOWN DC-DC CONVERTERS FORINTEGRATION IN A LOW VOLTAGE CMOS PROCESS " literary composition that people such as Volkan Kursun delivered in 2004 in the IEEE system.
Existing LED driving circuit generally has two kinds, a kind of is to utilize constant voltage supply supply collocation threshold currents resistance to limit the electric current of light-emitting diode, yet this mode can cause unnecessary power loss on threshold currents resistance, thereby causes the efficient of lighting device relatively poor; Another kind is to utilize the power supply unit of constant current source directly to export to decide electric current to light-emitting diode, yet this kind mode is simultaneously during the driven for emitting lights diode modules, the a plurality of light-emitting diodes that need this light emitting diode module is comprised are connected in parallel, the electric current of this constant current source output is the rated current sum of these a plurality of light-emitting diodes, but when one or more light-emitting diode burns, the electric current of the light-emitting diode of other operate as normal of then flowing through is greater than its rated current, then certainly will quicken these a plurality of operate as normal light-emitting diode light decay in addition burn, thereby influence the operate as normal of whole light emitting diode module.
Summary of the invention
To the adjustable LED driving circuit of a kind of output current be described with embodiment below.
A kind of LED driving circuit, it comprises a pulse-width modulation control chip, an input unit and an output unit.This pulse-width modulation control chip has the Vin pin, Vcc pin, LIN_D pin, PWM_D pin, GND pin, ISEN pin, DRV pin, Rosc pin.This Vin pin connects an external voltage, and this Rosc pin is by one first grounding through resistance, and this PWM_D pin connects a pulse-width modulation signal, this GND pin ground connection.This input unit comprises a slide rheostat.This slide rheostat has one first end, one second end and a sliding end, and this first end is electrically connected with this Vcc pin and GND pin respectively with this second end, and this sliding end is electrically connected with this LIN_D pin.This output unit comprises one second resistance, one the 3rd resistance, one the 4th resistance, one the 5th resistance, a N channel enhancement MOSFET, an inductance, a fast diode and one second electric capacity.The grid of this N channel enhancement MOSFET is electrically connected with this DRV pin by this bleeder circuit.The source electrode of this N channel enhancement MOSFET is electrically connected with this ISEN pin by this second resistance, and by the 3rd grounding through resistance.The grid of this N channel enhancement MOSFET is electrically connected with this DRV pin by the 4th resistance, and the grid of this N channel enhancement MOSFET is by the 5th grounding through resistance, and the drain electrode of this N channel enhancement MOSFET is electrically connected with an end anodal and this inductance of this fast diode respectively.The negative pole of this fast diode and the other end of this inductance are electrically connected with the two ends of this first electric capacity respectively, and the two ends of this first electric capacity are the output of LED driving circuit, and it is electrically connected with light emitting diode module.
With respect to prior art, after the Vin pin of this pulse-width modulation control chip of described LED driving circuit connects an external voltage, voltage of Vcc pin output of this pulse-width modulation control chip, the slidable adjustment of the sliding end of this slide rheostat is used to change the voltage swing of the LIN_D pin of importing this pulse-width modulation control chip, with the duty ratio of the pwm control signal that changes the output of this pulse-width modulation control chip, thereby change the size of the output current of this LED driving circuit.Therefore, the load of the output current of this LED driving circuit can connect the light-emitting diode of varying number, and it has assembles flexibility preferably.And can be, thereby regulate the work brightness of light-emitting diode by the adjusting led current size of flowing through.
Description of drawings
Fig. 1 is the circuit diagram of the LED driving circuit that provides of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present invention is described in further detail.
See also Fig. 1, a kind of LED driving circuit 10 that the embodiment of the invention provides, it comprises 11, one input units 12 of a pulse-width modulation control chip and an output unit 13.
Described pulse-width modulation control chip 11 is provided with a plurality of basic pins, and it comprises the Vin pin, Vcc pin, LIN_D pin, PWM_D pin, GND pin, ISEN pin, DRV pin, Rosc pin.In the present embodiment, this pulse-width modulation control chip 11 is integrated chip FP6700, and it can support high pressure and step-down framework, and its output current can be greater than 1 ampere.Wherein, this integrated chip FP6700 is that Eureka Microelectronics Inc. is in disclosed a chip for driving on April 1st, 2008.
The Vin pin of this integrated chip FP6700 is electrically connected with an external voltage VDD, and its electrical connection place is defined as first node A.This Rosc pin is by first resistance, 111 ground connection.The setting of the size of this first resistance 111 is used to change the frequency values of the PWM control of this integrated chip FP6700 output.Preferably, this first node A is by one first electric capacity 112 ground connection, and this first electric capacity 112 is a filter capacitor, to be used for the assorted signal of filtering.(Pulse WidthModulation, PWM) signal is electrically connected for this PWM_D pin and a pulse-width modulation.This GND pin ground connection.This ISEN pin is the input of the comparator of this integrated chip FP6700 inside.
This input unit 12 comprises 121, one second resistance of one second electric capacity 122, one the 3rd resistance 123, a slide rheostat 124.These second electric capacity, 121 1 ends are electrically connected with the Vcc pin of this integrated chip FP6700, and its connection is defined as Section Point B, the other end ground connection of this second electric capacity 121.This second electric capacity 121 is used for the assorted signal of the voltage of this Vcc output of filtering.This slide rheostat 124 comprises one first end, second end and a sliding end.First end of this slide rheostat 124 is electrically connected with this second resistance 122 and the 3rd resistance 123 respectively with second end.The other end of this second resistance 122 is electrically connected with this Section Point B.The other end ground connection of the 3rd resistance 123, and this earth point is defined as the 3rd node C.The sliding end of this slide rheostat 124 is electrically connected with the LIN_D pin of this integrated chip FP6700, and the connection is defined as the 4th node D.Preferably, this input unit 12 comprises that further the two ends of one the 3rd electric capacity 125, the three electric capacity 125 are electrically connected the 3rd node C and the 4th node D respectively.The 3rd electric capacity 125 is filter capacitor, is used for the assorted signal of filtering.
This output unit 13 includes one the 4th resistance 131,136, one second electric capacity 137 of 133, one N channel enhancement of 132, one the 6th resistance of the 5th resistance, 135, one fast diodes of MOSFET 134 inductance.Preferably, this output unit 13 further comprises one the 7th resistance 138 and one the 8th resistance 139.
Particularly, two ends of the 4th resistance 131 are electrically connected the DRV pin of this integrated chip FP6700 and the grid of this N channel enhancement MOSFET 134 respectively, and the grid connection of the 4th resistance 131 and this N channel enhancement MOSFET 134 is defined as the 5th node E.One end of the 5th resistance 132 is electrically connected other end ground connection with the 5th node E.The assorted signal of high frequency that the 4th resistance 131 and the 5th resistance 132 are used to suppress this N channel enhancement MOSFET 134 to be produced when closing.One end of the 6th resistance 133 is electrically connected other end ground connection with the source electrode of this N channel enhancement MOSFET 134.The two ends of the 7th resistance 138 are electrically connected the ISEN pin of this integrated chip FP6700 and the source electrode of this N channel enhancement MOSFET 134 respectively.One end of the 8th resistance 139 is electrically connected other end ground connection with the ISEN pin of this integrated chip FP6700.This seven resistance 138 and the 8th resistance 139 are used for suppressing the assorted signal of high frequency of the voltage at the 6th resistance 136 two ends.The drain electrode of this N channel enhancement MOSFET 134 is electrically connected with an end anodal and this inductance 135 of this fast diode 136 simultaneously.The two ends of this second electric capacity 137 are electrically connected with the negative pole of this fast diode 136 and the other end of this inductance 135 respectively, and this second electric capacity 137 is defined as the 6th node F with these inductance 135 connections.The negative pole of this fast diode 136 and the 6th node F are the output of this LED driving circuit, and it is electrically connected with light emitting diode module, and the input VIN with as light emitting diode module is used for the driven for emitting lights diode modules.
Behind the Yin pin external voltage of this integrated chip FP6700 of this LED driving circuit 10, the Vcc pin of this integrated chip FP6700 is then exported a voltage.This second resistance 122, the 3rd resistance 123 and this slide rheostat 124 constitute a bleeder circuit, thereby with the voltage dividing potential drop of the Vcc pin output of this integrated chip FP6700, part voltage inputs to this integrated chip FP6700 by this LIN_D pin.The comparator that this integrated chip FP6700 inside has is compared this input voltage with the reference comparison voltages of this integrated chip FP6700 internal preset, and exporting comparative result the PWM_D pin of this integrated chip FP6700 to, this this integrated chip FP6700 can change the size of current of the light-emitting diode (LED) module of flowing through according to input voltage.The sliding end of this slide rheostat 124 of slidable adjustment, can be used for changing the voltage swing of the comparator of importing this integrated chip FP6700 inside, thereby change the duty ratio of the pwm control signal of this integrated chip FP6700 output, and then control the conducting of this N channel enhancement MOSFET134 and the time that ends, thereby change the size of the output current of this LED driving circuit 10.The duty ratio of pwm control signal is directly proportional with the size of current of the load light emitting diode module of flowing through, and promptly duty ratio is big more, and the electric current of the load light emitting diode module of flowing through is big more, and duty ratio is more little, and the electric current of the load light emitting diode module of flowing through is more little.
Particularly, when this pwm control signal is high level, this N channel enhancement MOSFET 134 conductings, at this moment, this fast diode 136 ends, and inductance 135 has electric current to flow through and store electrical energy.And, the light emitting diode module of current direction the 6th resistance 133, inductance 135 and the load of this N channel enhancement of flowing through MOSFET 134.Flow through and present a magnitude of voltage behind the electric current of the 6th resistance 133, this magnitude of voltage is imported this integrated chip FP6700 inside by the ISEN pin of this integrated chip FP6700, the ISEN pin of this integrated chip FP6700 is the input of its internal comparator, and this comparator can change the size of current of the load light emitting diode module of flowing through according to output voltage.When the electric current of the load light emitting diode module of flowing through is excessive, when this integrated chip FP6700 controls this pwm control signal and becomes to low level by high level, this N channel enhancement MOSFET 134 ends, thereby the electric energy that is stored in this inductance 135 makes fast diode 136 conductings flow to this load light emitting diode module.Further, in this LED driving circuit 10, the size of this first resistance 111 has determined the height of the operating frequency of the pwm control signal that this integrated chip FP6700 exports, particularly, the resistance of this first resistance 111 is big more, then the operating frequency of the pwm control signal of this integrated chip FP6700 output is low more, and the operating frequency of the pwm control signal of this integrated chip FP6700 output is low more, and the electric current of the light emitting diode module of the load of then flowing through is just more little.
Because the slidable adjustment of the sliding end of this slide rheostat 124, can change the size of the voltage that inputs to this integrated chip FP6700 internal comparator, thereby change the duty ratio of the pwm control signal of this integrated chip FP6700 output, thereby change the size of the output current of this LED driving circuit 10.Therefore, the load of this LED driving circuit can connect the light-emitting diode of varying number, and it has assembles flexibility preferably.And, can be by the adjusting led current size of flowing through, thus the work brightness of light-emitting diode regulated.
In addition, those skilled in the art also can do other variation and be used for design of the present invention in spirit of the present invention, as long as it does not depart from technique effect of the present invention and all can.The variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.
Claims (6)
1. LED driving circuit, it comprises:
A pulse-width modulation control chip, it has the Vin pin, the Vcc pin, the LIN_D pin, the PWM_D pin, GND pin, ISEN pin, the DRV pin, the Rosc pin, this Vin pin connects an external voltage, and this Rosc pin is by one first grounding through resistance, this PWM_D pin connects a pulse-width modulation signal, this GND pin ground connection;
An input unit, it comprises a slide rheostat, and this slide rheostat has one first end, one second end and a sliding end, this first end is electrically connected with this Vcc pin and GND pin respectively with this second end, and this sliding end is electrically connected with this LIN_D pin;
An output unit, it comprises one second resistance, one the 3rd resistance, one the 4th resistance, one the 5th resistance, a N channel enhancement MOSFET, an inductance, a fast diode and one second electric capacity, the grid of this N channel enhancement MOSFET is electrically connected with this DRV pin by this bleeder circuit, the source electrode of this N channel enhancement MOSFET is electrically connected with this ISEN pin by this second resistance, and by the 3rd grounding through resistance, the grid of this N channel enhancement MOSFET is electrically connected with this DRV pin by the 4th resistance, and the grid of this N channel enhancement MOSFET is by the 5th grounding through resistance, and the drain electrode of this N channel enhancement MOSFET is electrically connected with an end anodal and this inductance of this fast diode respectively, and the negative pole of this fast diode and the other end of this inductance are electrically connected with the two ends of this first electric capacity respectively, the two ends of this first electric capacity are the output of LED driving circuit, and it is electrically connected with light emitting diode module.
2. LED driving circuit as claimed in claim 1 is characterized in that, this input unit further comprises one second electric capacity, and the Vcc pin of this pulse-width modulation control chip is by this second capacity earth.
3. LED driving circuit as claimed in claim 1 is characterized in that, this input unit further comprises one the 3rd electric capacity, and an end of the 3rd electric capacity is electrically connected the LIN_D pin of this pulse-width modulation control chip, other end ground connection.
4. LED driving circuit as claimed in claim 1 is characterized in that, this LED driving circuit further comprises one the 4th electric capacity, and an end of the 4th electric capacity is electrically connected with the Vin pin of this pulse-width modulation control chip, its other end ground connection.
5. LED driving circuit as claimed in claim 1 is characterized in that, this output unit further comprises one the 6th resistance, and an end of the 6th resistance is electrically connected other end ground connection with the ISEN pin of this pulse-width modulation control chip.
6. LED driving circuit as claimed in claim 1 is characterized in that, this pulse-width modulation control chip is FP6700.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910306840XA CN102026435B (en) | 2009-09-10 | 2009-09-10 | Light emitting diode driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910306840XA CN102026435B (en) | 2009-09-10 | 2009-09-10 | Light emitting diode driving circuit |
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| Publication Number | Publication Date |
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| CN102026435A true CN102026435A (en) | 2011-04-20 |
| CN102026435B CN102026435B (en) | 2013-06-19 |
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| CN200910306840XA Expired - Fee Related CN102026435B (en) | 2009-09-10 | 2009-09-10 | Light emitting diode driving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103139969A (en) * | 2011-11-30 | 2013-06-05 | 海洋王照明科技股份有限公司 | Marker and control circuit thereof |
| CN107946268A (en) * | 2017-11-30 | 2018-04-20 | 郑州云海信息技术有限公司 | A kind of method and device for strengthening chip operation stability |
| CN112272429A (en) * | 2020-10-26 | 2021-01-26 | 兰普电器股份有限公司 | Light source driver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201256471Y (en) * | 2008-09-11 | 2009-06-10 | 源辰光科股份有限公司 | LED driver circuit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201256471Y (en) * | 2008-09-11 | 2009-06-10 | 源辰光科股份有限公司 | LED driver circuit |
Non-Patent Citations (1)
| Title |
|---|
| 李良成等: "基于MAX1916的亮度可调LED驱动电路", 《现代显示》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103139969A (en) * | 2011-11-30 | 2013-06-05 | 海洋王照明科技股份有限公司 | Marker and control circuit thereof |
| CN103139969B (en) * | 2011-11-30 | 2015-05-06 | 海洋王照明科技股份有限公司 | Marker and control circuit thereof |
| CN107946268A (en) * | 2017-11-30 | 2018-04-20 | 郑州云海信息技术有限公司 | A kind of method and device for strengthening chip operation stability |
| CN112272429A (en) * | 2020-10-26 | 2021-01-26 | 兰普电器股份有限公司 | Light source driver |
| CN112272429B (en) * | 2020-10-26 | 2022-10-04 | 兰普电器股份有限公司 | Light source driver |
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| CN102026435B (en) | 2013-06-19 |
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