CN107172768A - A kind of LED drive controls circuit - Google Patents
A kind of LED drive controls circuit Download PDFInfo
- Publication number
- CN107172768A CN107172768A CN201710590712.7A CN201710590712A CN107172768A CN 107172768 A CN107172768 A CN 107172768A CN 201710590712 A CN201710590712 A CN 201710590712A CN 107172768 A CN107172768 A CN 107172768A
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- 238000001514 detection method Methods 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a kind of LED drive controls circuit, it includes power supply, on-off circuit, major trunk roads current detection and feedback circuit, comparator, LED lamp panel and brightness regulating circuit, the major trunk roads current detection and feedback circuit is compared input and is connected with the first connection end of the on-off circuit and the first of the comparator respectively, the major trunk roads current detection and feedback circuit, which is used to detect, flows through the on-off circuit to the major trunk roads electric current of the LED lamp panel, and the electric current detected is converted into feedback voltage and exported compare input to the first of the comparator, the output end of the comparator is connected with the switch control terminal of the on-off circuit, the conducting and disconnection of the on-off circuit are controlled for the feedback voltage and the output voltage of the brightness regulating circuit according to the major trunk roads current detection and feedback circuit.The LED drive control circuits of the present invention have the advantages that driving current is stable.
Description
Technical field
The present invention relates to LED actuation techniques, a kind of specifically LED drive controls circuit.
Background technology
LED is widely applied to the fields such as equipment indicating lamp, ornament lamp, advertisement engineering, city lighting engineering.Traditional
LED drive controls control circuit using voltage-regulation, and when voltage is less than threshold value, LED turns off the light；When voltage is increased to threshold value, LED points
Bright, voltage continues to raise, brightness increase.
If not taking safeguard measure, elevated voltage can cause electric current to increase, and the electric current of this increase exceedes necessarily
LED will be damaged after time and amplitude.Indivedual or one always occur by use for a long time in some LEDs or LED screen on the market
The phenomenon that piece lamp point does not work, its main cause is exactly that LED flows through the electric current of overrate and causes the excessive life-span of generating heat for a long time
Reduce and burn out.
At present to more than LED current limlitings using methods such as protective tube, VTS surge absoption diodes.Such circuit does not have constant current guarantor
Protective function, reaction speed is slow, easily influences LED service life because electric current is excessive for a long time.
The content of the invention
It is an object of the invention to overcome the shortcomings of the presence of above prior art, there is provided a kind of driving current stabilization
LED drive control circuits.
In order to achieve the above object, the present invention uses following technical scheme：
A kind of LED drive controls circuit, it includes power supply, on-off circuit, major trunk roads current detection and feedback circuit, comparator, LED
Lamp plate and brightness regulating circuit,
The power supply is connected by the on-off circuit with the LED lamp panel；
The on-off circuit includes the first connection end being connected with the power supply, the second company being connected with the LED lamp panel
Connect end and for controlling the on-off circuit conducting and the switch control terminal disconnected；
The comparator compares input including first, second compares input and output end；
The major trunk roads current detection and feedback circuit respectively with the first connection end of the on-off circuit and the comparator
One, which compares input, is connected, and the major trunk roads current detection and feedback circuit flows through the on-off circuit to described for detection
The major trunk roads electric current of LED lamp panel, and the electric current detected is converted into feedback voltage and exported compare to the first of the comparator
Input；
The brightness regulating circuit is compared input with the second of the comparator and is connected；
The output end of the comparator is connected with the switch control terminal of the on-off circuit, for according to the major trunk roads electric current
Detect the feedback voltage of feedback circuit and the output voltage of the brightness regulating circuit control the conducting of the on-off circuit with
Disconnect.
In the embodiment of the present invention, the on-off circuit uses FET Q1, and the switch control terminal of the on-off circuit is
The grid of the FET Q1, the first connection end of the on-off circuit is the drain electrode of the FET Q1, the switch
Second connection end of circuit is the source electrode of the FET Q1.
In the embodiment of the present invention, the comparator uses amplifier chip LM324, wherein, the electricity of the amplifier chip LM324
Source input and ground wire connection end connect the power supply and ground respectively, the inverting input of the amplifier chip LM324 with mutually defeated
Enter to hold respectively described first to compare input and described second and compare input, the output end of the amplifier chip LM324 is
The output end of the comparator.
In the embodiment of the present invention, the power supply is connected by current-limiting resistance R3 with the drain electrode of the FET Q1.
In the embodiment of the present invention, the major trunk roads current detection and feedback circuit includes resistance R1, feedback detection resistance R2, electricity
Resistance R1 is connected between the inverting input of the amplifier chip LM324 and ground, and feedback detection resistance R2 is connected to the amplifier
The drain electrode of chip LM324 inverting input and the FET Q1.
In the embodiment of the present invention, the brightness regulating circuit includes resistance R5, R6, and resistance R6 connects power supply, resistance R5 connections
Between the power supply and the amplifier chip LM324 in-phase input end, resistance R6 is connected to the amplifier chip LM324's
Between in-phase input end and ground, resistance R6 is adjustable resistance.
In the embodiment of the present invention, the LED lamp panel includes multiple LED strip joint groups, and the LED strip joint group is by 6 luminous two
Pole pipe is composed in series.
The present invention has the following advantages and effect relative to prior art：
In the LED drive control circuits of the present invention, by setting a major trunk roads current detection and feedback circuit to be flowed into detect
The size of the major trunk roads electric current of LED lamp panel, and the feedback voltage of major trunk roads current detection and feedback circuit output is input to
Fed back in comparator, by the output result of the comparator come the conducting and closing of controlling switch circuit, can all the time by
The current control of LED lamp panel is flowed into a rational scope to protect the electric current of LED lamp panel constant, guarantor is realized
The function of LED circuit is protected, LED drive controls circuit realiration of the invention is simple, and cost is low, effect stability, can effectively control LED
The light on and off of lamp plate and control brightness value, allow LED lamp panel to run steadily in the long term.
Brief description of the drawings
Fig. 1 is the structural representation of the LED drive control circuits of the embodiment of the present invention.
Fig. 2 is the circuit diagram of Fig. 1 LED drive control circuits.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The realization of the present invention is described in detail below in conjunction with specific embodiment,
As shown in figure 1, the embodiment of the present invention provides a kind of LED drive controls circuit, it includes power supply 11, on-off circuit 12, master
Arterial highway current detection and feedback circuit 13, comparator 14, LED lamp panel 15 and brightness regulating circuit 16.
The power supply 11 is connected by the on-off circuit 12 with the LED lamp panel 15, and the power supply 11 is used for for institute
State the DC voltage that LED lamp panel 15 provides 24V.
The on-off circuit 12 includes the first connection end K1 being connected with the power supply 11 and the phase of LED lamp panel 15
Second connection end K2 of the connection and switch control terminal K3 for controlling the conducting of on-off circuit 12 and disconnection.
The comparator 14 compares input B1 including first, second compares input B2 and output end B3.
The major trunk roads current detection and feedback circuit 13 respectively with the first connection end K1 of the on-off circuit 12 and described
The first of comparator 14 compares input B1 and is connected, and the major trunk roads current detection and feedback circuit 14 is used to flow through the switch
The electric current detected and is converted into feedback voltage and exported to the ratio by circuit 12 to the major trunk roads electric current of the LED lamp panel 15
First compared with device 14 compares input B1.
The brightness regulating circuit 16 is compared input B2 with the second of the comparator 14 and is connected, and the brightness is adjusted
Whole circuit 16 is used for the brightness for adjusting the LED lamp panel 15.
The output end B3 of the comparator 14 is connected with the switch control terminal K3 of the on-off circuit 12, the comparator
14 be used for according to the major trunk roads current detection and feedback circuit 13 export feedback voltage and the brightness regulating circuit 16 it is defeated
Go out voltage to control the conducting and disconnection of the on-off circuit 12.
As shown in Fig. 2 Fig. 2 shows the circuit diagram of Fig. 1 LED drive control circuits.Wherein, the on-off circuit 12 is adopted
It is the grid of the FET Q1, the on-off circuit to use FET Q1, the switch control terminal K3 of the on-off circuit 12
12 the first connection end K1 is the drain electrode of the FET Q1, and the second connection end K2 of the on-off circuit is the field-effect
Pipe Q1 source electrode.The power supply 11 is connected by current-limiting resistance R3 with the drain electrode of the FET Q1.
The comparator 14 uses amplifier chip LM324, wherein, the power input 4 and ground of the amplifier chip LM324
Line connection end 11 connects the power supply 11 and ground, 3 points of inverting input 2 and the in-phase input end of the amplifier chip LM324 respectively
Wei described first to compare input B1 and described second to compare input B2, amplifier chip LM324 output end 1 be not institute
State the output end B3 of comparator.
The major trunk roads current detection and feedback circuit 13 includes resistance R1 and feeds back detection resistance R2, and resistance R1 is connected to
Between the inverting input 2 and ground of the amplifier chip LM324, feedback detection resistance R2 is connected to the amplifier chip LM324
Inverting input 2 and the FET Q1 drain electrode.
The brightness regulating circuit 16 includes resistance R5, R6, and resistance R6 connects power supply, and resistance R5 is connected to the power supply and institute
Between the in-phase input end for stating amplifier chip LM324, resistance R6 is connected to the in-phase input end and ground of the amplifier chip LM324
Between, resistance R6 is adjustable resistance, can adjust resistance R6 resistance value by manual rotation, the brightness of adjustable LED lamp, can be with
From going out to bright, and brightness is stepped up to rated value.
The LED lamp panel 15 includes multiple LED strip joint groups, and the LED strip joint group is composed in series by 6 light emitting diodes.
The operation principle of above-mentioned LED drive controls circuit is as follows：
Electric on circuit, resistance R6 is when being adapted to resistance, FET Q1 conductings, and electricity is lighted in the LED lamp panel 15, is at this moment flowed
Major trunk roads electric current to the LED lamp panel 15 belongs in rated range.When major trunk roads electric current increases suddenly, detection resistance R2 is fed back
Electric current increases, the inverting input input voltage increase of the amplifier chip LM324, and the amplifier chip LM324's is same mutually defeated
Enter end to reduce with inverting input voltage difference, the output end output low level of the amplifier chip LM324, FET Q1 is cut
Only.But due to inert effect of the human eye to light, people feels that LED moment does not extinguish.At this moment due in major trunk roads electric current
Disconnected, feedback detection resistance R2 electric currents are reduced, and the inverting input input voltage of the amplifier chip LM324 declines, the amplifier
Chip LM324 in-phase input end becomes big with inverting input voltage difference, and the output end output of the amplifier chip LM324 is high
Level, FET Q1 is turned on again, and electricity is lighted in LED.This is a quickly change control process, it is ensured that work as major trunk roads
Electric current cuts off FET Q1 immediately when increasing, and electric current is reduced to after certain threshold value turns on FET Q1 at once, all the time will be main
Arterial highway current control is in a rational scope, so as to protect the electric current of the LED lamp panel 15 constant, realizes protection institute
State the function of LED lamp panel 15.
The present invention has the following advantages and effect relative to prior art：
In the LED drive control circuits of the present invention, by setting a major trunk roads current detection and feedback circuit to be flowed into detect
The size of the major trunk roads electric current of LED lamp panel, and the feedback voltage of major trunk roads current detection and feedback circuit output is input to
Fed back in comparator, by the output result of the comparator come the conducting and closing of controlling switch circuit, can all the time by
The current control of LED lamp panel is flowed into a rational scope to protect the electric current of LED lamp panel constant, guarantor is realized
The function of LED circuit is protected, LED drive controls circuit realiration of the invention is simple, and cost is low, effect stability, can effectively control LED
The light on and off of lamp plate and control brightness value, allow LED lamp panel to run steadily in the long term.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of LED drive controls circuit, it is characterised in that including power supply, on-off circuit, major trunk roads current detection feedback electricity
Road, comparator, LED lamp panel and brightness regulating circuit,
The power supply is connected by the on-off circuit with the LED lamp panel；
The on-off circuit includes the first connection end being connected with the power supply, the second company being connected with the LED lamp panel
Connect end and for controlling the on-off circuit conducting and the switch control terminal disconnected；
The comparator compares input including first, second compares input and output end；
The major trunk roads current detection and feedback circuit respectively with the first connection end of the on-off circuit and the comparator
One, which compares input, is connected, and the major trunk roads current detection and feedback circuit flows through the on-off circuit to described for detection
The major trunk roads electric current of LED lamp panel, and the electric current detected is converted into feedback voltage and exported compare to the first of the comparator
Input；
The brightness regulating circuit is compared input with the second of the comparator and is connected；
The output end of the comparator is connected with the switch control terminal of the on-off circuit, for according to the major trunk roads electric current
Detect the feedback voltage of feedback circuit and the output voltage of the brightness regulating circuit control the conducting of the on-off circuit with
Disconnect.
2. LED drive controls circuit according to claim 1, it is characterised in that：The on-off circuit uses FET
Q1, the switch control terminal of the on-off circuit is the grid of the FET Q1, and the first connection end of the on-off circuit is
The drain electrode of the FET Q1, the second connection end of the on-off circuit is the source electrode of the FET Q1.
3. LED drive controls circuit according to claim 2, it is characterised in that：The comparator uses amplifier chip
LM324, wherein, the power input of the amplifier chip LM324 and ground wire connection end connect the power supply and ground, the fortune respectively
The inverting input and in-phase input end for putting chip LM324 are respectively described first to be compared input and described second and compare input
End, the output end of the amplifier chip LM324 is the output end of the comparator.
4. LED drive controls circuit according to claim 3, it is characterised in that：The power supply by current-limiting resistance R3 with
The drain electrode of the FET Q1 is connected.
5. LED drive controls circuit according to claim 4, it is characterised in that：The major trunk roads current detection feedback electricity
Road includes resistance R1 and feedback detection resistance R2, resistance R1 are connected to the inverting input and ground of the amplifier chip LM324
Between, feedback detection resistance R2 is connected to the drain electrode of the inverting input and the FET Q1 of the amplifier chip LM324.
6. LED drive controls circuit according to claim 5, it is characterised in that：The brightness regulating circuit includes resistance
R5, R6, resistance R6 connect power supply, and resistance R5 is connected between the power supply and the amplifier chip LM324 in-phase input end, electricity
Resistance R6 is connected between the in-phase input end of the amplifier chip LM324 and ground, and resistance R6 is adjustable resistance.
7. LED drive controls circuit according to claim 1, it is characterised in that：The LED lamp panel includes multiple LED strips
Joint group, the LED strip joint group is composed in series by 6 light emitting diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710590712.7A CN107172768A (en) | 2017-07-19 | 2017-07-19 | A kind of LED drive controls circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710590712.7A CN107172768A (en) | 2017-07-19 | 2017-07-19 | A kind of LED drive controls circuit |
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| Publication Number | Publication Date |
|---|---|
| CN107172768A true CN107172768A (en) | 2017-09-15 |
Family
ID=59817285
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710590712.7A Pending CN107172768A (en) | 2017-07-19 | 2017-07-19 | A kind of LED drive controls circuit |
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| Country | Link |
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| CN (1) | CN107172768A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108551500A (en) * | 2018-03-29 | 2018-09-18 | 努比亚技术有限公司 | A kind of terminal, control circuit and its control method |
| CN108668414A (en) * | 2018-06-27 | 2018-10-16 | 浙江阳光美加照明有限公司 | A kind of alternating current and the dual-purpose LED grass of low-voltage DC insert lamp |
| CN109904150A (en) * | 2017-12-11 | 2019-06-18 | 宏碁股份有限公司 | miniaturized light-emitting device |
| CN112051885A (en) * | 2020-09-08 | 2020-12-08 | 杰华特微电子（杭州）有限公司 | Voltage regulating circuit and method |
| CN114449699A (en) * | 2020-11-03 | 2022-05-06 | 西安钛铂锶电子科技有限公司 | Display driving chip and LED lamp panel |
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| CN101960922A (en) * | 2008-03-24 | 2011-01-26 | 东芝照明技术株式会社 | Power supply units and lighting fixtures |
| CN102695329A (en) * | 2011-03-23 | 2012-09-26 | 松下电器产业株式会社 | Lighting device for solid-state light source, and illumination apparatus and system including same |
| CN204559950U (en) * | 2015-03-27 | 2015-08-12 | 绵阳豪迈电子科技有限公司 | For the current feedback LED constant current controller of cctv surveillance |
| US20170171926A1 (en) * | 2015-12-15 | 2017-06-15 | Lg Innotek Co., Ltd. | Power device and method for controlling output current of the same |
| CN207070404U (en) * | 2017-07-19 | 2018-03-02 | 深圳怡化电脑股份有限公司 | A kind of LED drive controls circuit |
-
2017
- 2017-07-19 CN CN201710590712.7A patent/CN107172768A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101960922A (en) * | 2008-03-24 | 2011-01-26 | 东芝照明技术株式会社 | Power supply units and lighting fixtures |
| CN102695329A (en) * | 2011-03-23 | 2012-09-26 | 松下电器产业株式会社 | Lighting device for solid-state light source, and illumination apparatus and system including same |
| CN204559950U (en) * | 2015-03-27 | 2015-08-12 | 绵阳豪迈电子科技有限公司 | For the current feedback LED constant current controller of cctv surveillance |
| US20170171926A1 (en) * | 2015-12-15 | 2017-06-15 | Lg Innotek Co., Ltd. | Power device and method for controlling output current of the same |
| CN207070404U (en) * | 2017-07-19 | 2018-03-02 | 深圳怡化电脑股份有限公司 | A kind of LED drive controls circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109904150A (en) * | 2017-12-11 | 2019-06-18 | 宏碁股份有限公司 | miniaturized light-emitting device |
| CN109904150B (en) * | 2017-12-11 | 2021-01-26 | 宏碁股份有限公司 | Miniaturized light-emitting device |
| CN108551500A (en) * | 2018-03-29 | 2018-09-18 | 努比亚技术有限公司 | A kind of terminal, control circuit and its control method |
| CN108668414A (en) * | 2018-06-27 | 2018-10-16 | 浙江阳光美加照明有限公司 | A kind of alternating current and the dual-purpose LED grass of low-voltage DC insert lamp |
| CN108668414B (en) * | 2018-06-27 | 2023-11-10 | 浙江阳光美加照明有限公司 | Dual-purpose LED grass of commercial power and low voltage direct current is inserted lamp |
| CN112051885A (en) * | 2020-09-08 | 2020-12-08 | 杰华特微电子（杭州）有限公司 | Voltage regulating circuit and method |
| CN114449699A (en) * | 2020-11-03 | 2022-05-06 | 西安钛铂锶电子科技有限公司 | Display driving chip and LED lamp panel |
| CN114449699B (en) * | 2020-11-03 | 2024-06-07 | 西安钛铂锶电子科技有限公司 | Display driving chip and LED lamp panel |
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Application publication date: 20170915 |