CN105934021A - Overvoltage adjusting circuit for linear constant-current driving LED - Google Patents
Overvoltage adjusting circuit for linear constant-current driving LED Download PDFInfo
- Publication number
- CN105934021A CN105934021A CN201610284677.1A CN201610284677A CN105934021A CN 105934021 A CN105934021 A CN 105934021A CN 201610284677 A CN201610284677 A CN 201610284677A CN 105934021 A CN105934021 A CN 105934021A
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- resistance
- connects
- input
- potential drop
- dividing potential
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Classifications
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- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Abstract
The invention belongs to the technical field of an electronic circuit, and relates to an overvoltage adjusting circuit for a linear constant-current driving LED. The circuit of the device comprises a serial LED lamp group and a constant-current module, and is characterized by further comprising a voltage-dividing adjusting module, wherein an input power supply is connected with an anode of the serial LED lamp group; the cathode of the serial LED lamp group is connected with the input end of the voltage-dividing adjusting module; and the output end of the voltage-dividing adjusting module is connected with the input end of the constant-current module. The overvoltage adjusting circuit has the following advantages: the circuit of the device mainly solves the problem of too much power consumption caused by too large linear constant-current input voltages, when the input voltages are increased to a set value, an external voltage-dividing serial resistor is connected in series with the circuit for sharing the voltages, and thus the power consumption of a chip is reduced.
Description
Technical field
The invention belongs to electronic circuit technology field, relate to a kind of overvoltage adjustment circuit driving LED for linear constant current.
Background technology
LED is widely used in every field now, and it main advantage is that volume is little, low in energy consumption, cost
Low.As a kind of new light source, need it is carried out special electric drive design, the linear driving of driving method currently mainly
Drive with Switching Power Supply.The mode of Linear Driving is fairly simple, has the advantages such as little, the low cost of electromagnetic interference EMI, in market
On occupy the biggest share.But in the case of mains fluctuations, the input voltage of chip can raise, and causes driving chip
Power consumption increases, and causes the hot problem such as even burn of chip.Therefore, for the LED of constant-current driving, there is overvoltage protection
Circuit can regulate power consumption and the protection driving chip of chip well.
Summary of the invention
It is an object of the invention to provide a kind of overvoltage adjustment circuit driving LED for linear constant current.
The technical scheme is that a kind of overvoltage adjustment circuit driving LED for linear constant current, including series LED lamp
Group and constant flow module, it is characterised in that also include dividing potential drop adjustment module；Wherein, input power is just connecing the LED group of series connection
Pole；The negative pole of series LED lamp group connects the input of dividing potential drop adjustment module；The output of dividing potential drop adjustment module terminates the defeated of constant flow module
Enter end.
Further, described dividing potential drop adjustment module by PMOS PMOS1, the first pressure pipe NM2, dividing potential drop series resistance R4,
First resistance R1, the second resistance R2, the 3rd resistance R3, phase inverter INV and Zener diode Zener1 are constituted；Wherein,
The source electrode of PMOS PMOS1 connects the negative pole of series LED lamp group；Dividing potential drop series resistance R4 mono-terminates PMOS PMOS1
Source, another termination PMOS PMOS1 drain electrode；The grid of PMOS PMOS1 connects one end of the first resistance R1；
The source electrode of another termination PMOS PMOS1 of the first resistance R1；One termination PMOS PMOS1 of the second resistance R2
Source electrode, another termination phase inverter INV input；The input of the one termination phase inverter INV of the 3rd resistance R3, another
Termination GND；The source electrode of the first pressure pipe NM2 meets GND, and grid connects the outfan of phase inverter INV, and drain electrode connects the first electricity
One end of resistance R1；The negative pole of Zener diode Zener1 connects the input of phase inverter INV, and positive pole meets GND.
Further, constant flow module is made up of the second pressure pipe NM1, the 4th resistance RS and operational amplifier；Wherein second is resistance to
The drain electrode of pressure pipe NM1 connects the drain electrode of PMOS PMOS1, and source electrode is by ground connection after the 4th resistance RS, and grid connects computing and puts
The outfan of big device；The positive pole of operational amplifier connects reference voltage V REF, and negative pole connects the source electrode of the second pressure pipe NM1.
Beneficial effects of the present invention is, device circuitry of the present invention is excessive mainly for the excessive power consumption brought of linear constant current input voltage
Problem, when input voltage increases to setting value, external dividing potential drop series resistance is sealed in circuit is shared voltage, thus drop
Low chip power-consumption.
Accompanying drawing explanation
Fig. 1 is the structural representation of the overvoltage adjustment circuit driving LED for linear constant current of the present invention；
Fig. 2 is the relation schematic diagram of input supply voltage and the input voltage of constant flow module.
Detailed description of the invention
Below in conjunction with the accompanying drawings, technical scheme is described in detail:
The a kind of of the present invention drives the overvoltage of LED to adjust circuit, as it is shown in figure 1, include series LED lamp for linear constant current
Group and constant flow module, it is characterised in that also include dividing potential drop adjustment module；Wherein, input power is just connecing the LED group of series connection
Pole；The negative pole of series LED lamp group connects the input of dividing potential drop adjustment module；The output of dividing potential drop adjustment module terminates the defeated of constant flow module
Enter end；Described dividing potential drop adjustment module is by PMOS PMOS1, and the first pressure pipe NM2, dividing potential drop series resistance R4, first is electric
Resistance R1, the second resistance R2, the 3rd resistance R3, phase inverter INV and Zener diode Zener1 is constituted；Wherein, PMOS
The source electrode of pipe PMOS1 connects the negative pole of series LED lamp group；Dividing potential drop series resistance R4 mono-terminates the source of PMOS PMOS1
End, the drain electrode of another termination PMOS PMOS1；The grid of PMOS PMOS1 connects one end of the first resistance R1；The
The source electrode of another termination PMOS PMOS1 of one resistance R1；One termination PMOS PMOS1 of the second resistance R2
Source electrode, the input of another termination phase inverter INV；The input of the one termination phase inverter INV of the 3rd resistance R3, the other end
Meet GND；The source electrode of the first pressure pipe NM2 meets GND, and grid connects the outfan of phase inverter INV, and drain electrode connects the first resistance
One end of R1；The negative pole of Zener diode Zener1 connects the input of phase inverter INV, and positive pole meets GND；Constant flow module is by
Two pressure pipe NM1, the 4th resistance RS and operational amplifier are constituted；Wherein the drain electrode of the second pressure pipe NM1 connects PMOS
The drain electrode of PMOS1, source electrode is by ground connection after the 4th resistance RS, and grid connects the outfan of operational amplifier；Operational amplifier
Positive pole connects reference voltage V REF, and negative pole connects the source electrode of the second pressure pipe NM1.
As in figure 2 it is shown, be the relation of input supply voltage and the input voltage of constant flow module, it is seen that when input supply voltage height arrives
Time to a certain degree, the input voltage of constant flow module can decline suddenly so that the input voltage of constant flow module reduces, a part of voltage
Divided to walk by a point voltage regulator circuit, thus reduce the power consumption of driving chip.
The operation principle of the present invention is:
When input power be zero i.e. V1 be zero time, dividing potential drop adjustment module PMOS1 pipe cut-off, pressure pipe NM2 turn on；
When supply voltage is gradually increased, constant flow module is started working, and pressure pipe NM1 progresses into saturation, keeps LED to drive
The steady state of streaming current；Now, NM2 pipe is that the PMOS1 pipe that makes of conducting is also switched on, and allows electric current flow through PMOS1
Pipe, supply voltage at this moment is big not enough, belongs to the scope of normal work；But, when supply voltage continues to increase, meeting
Making NM2 pipe progress into cut-off state, end once NM2 pipe, PMOS1 pipe also can end, now dividing potential drop series connection
Resistance R4 can seal in circuit, gets a part of supply voltage so that the input voltage of driving chip declines, thus serves guarantor
Protect chip and LED group and reduce the effect of power consumption.If voltage is excessive, Zener diode also can play certain protection and make
With, the voltage preventing sampling is excessive.Meanwhile, the resistance of regulation R2 and R3 can regulate the voltage of this circuit and play tune point so that
The scope of circuit work is the most flexible.
Claims (3)
1. driving the overvoltage of LED to adjust a circuit for linear constant current, including series LED lamp group and constant flow module, it is special
Levy and be, also include dividing potential drop adjustment module；Wherein, input power connects the positive pole of LED group of series connection；Series LED lamp group
Negative pole connect the input of dividing potential drop adjustment module；The input of the output termination constant flow module of dividing potential drop adjustment module.
A kind of overvoltage adjustment circuit driving LED for linear constant current the most according to claim 1, it is characterised in that
Described dividing potential drop adjustment module by PMOS PMOS1, the first pressure pipe NM2, dividing potential drop series resistance R4, the first resistance R1,
Second resistance R2, the 3rd resistance R3, phase inverter INV and Zener diode Zener1 are constituted；Wherein, PMOS PMOS1
Source electrode connect the negative pole of series LED lamp group；Dividing potential drop series resistance R4 mono-terminates the source of PMOS PMOS1, the other end
Connect the drain electrode of PMOS PMOS1；The grid of PMOS PMOS1 connects one end of the first resistance R1；First resistance R1
Another termination PMOS PMOS1 source electrode；The source electrode of one termination PMOS PMOS1 of the second resistance R2, another
The input of termination phase inverter INV；The input of the one termination phase inverter INV of the 3rd resistance R3, another terminates GND；The
The source electrode of one pressure pipe NM2 meets GND, and grid connects the outfan of phase inverter INV, and drain electrode connects one end of the first resistance R1；
The negative pole of Zener diode Zener1 connects the input of phase inverter INV, and positive pole meets GND.
A kind of overvoltage adjustment circuit driving LED for linear constant current the most according to claim 2, it is characterised in that
Constant flow module is made up of the second pressure pipe NM1, the 4th resistance RS and operational amplifier；The wherein leakage of the second pressure pipe NM1
Pole connects the drain electrode of PMOS PMOS1, and source electrode is by ground connection after the 4th resistance RS, and grid connects the outfan of operational amplifier；
The positive pole of operational amplifier connects reference voltage V REF, and negative pole connects the source electrode of the second pressure pipe NM1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284677.1A CN105934021A (en) | 2016-05-03 | 2016-05-03 | Overvoltage adjusting circuit for linear constant-current driving LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284677.1A CN105934021A (en) | 2016-05-03 | 2016-05-03 | Overvoltage adjusting circuit for linear constant-current driving LED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105934021A true CN105934021A (en) | 2016-09-07 |
Family
ID=56837829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610284677.1A Pending CN105934021A (en) | 2016-05-03 | 2016-05-03 | Overvoltage adjusting circuit for linear constant-current driving LED |
Country Status (1)
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| CN (1) | CN105934021A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793271A (en) * | 2016-12-09 | 2017-05-31 | 欧普照明股份有限公司 | The linear constant current circuit of overvoltage protection |
| CN107182150A (en) * | 2017-06-30 | 2017-09-19 | 苏州菲达旭微电子有限公司 | A kind of linear constant current pipe bleeder circuit |
| CN108601162A (en) * | 2018-07-03 | 2018-09-28 | 上海路傲电子科技有限公司 | LED illumination linear constant current driving circuit |
| CN108811231A (en) * | 2017-05-05 | 2018-11-13 | 东莞艾笛森光电有限公司 | Dim optimized emission diode drive circuit |
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| CN101562327A (en) * | 2008-04-17 | 2009-10-21 | 德信智能手机技术（北京）有限公司 | Overvoltage protective device in wireless fixed phone charging mode |
| CN201490685U (en) * | 2009-07-24 | 2010-05-26 | 深圳市中兴移动通信有限公司 | Multifunction power protection circuit |
| CN102780202A (en) * | 2011-05-09 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overvoltage protection circuit and lamp |
| CN102833917A (en) * | 2012-08-29 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED constant-current control circuit and LED liquid crystal television |
| CN103281834A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | Overvoltage protection circuit applied to alternative current LED drive system |
| CN103687173A (en) * | 2012-09-17 | 2014-03-26 | 朗捷科技股份有限公司 | Universal linear LED drive circuit capable of de-flashing |
| US20150312987A1 (en) * | 2010-03-03 | 2015-10-29 | Emeray, Llc | Led driver operating from unfiltered mains on a half-cycle by half-cycle basis |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101562327A (en) * | 2008-04-17 | 2009-10-21 | 德信智能手机技术（北京）有限公司 | Overvoltage protective device in wireless fixed phone charging mode |
| CN201490685U (en) * | 2009-07-24 | 2010-05-26 | 深圳市中兴移动通信有限公司 | Multifunction power protection circuit |
| US20150312987A1 (en) * | 2010-03-03 | 2015-10-29 | Emeray, Llc | Led driver operating from unfiltered mains on a half-cycle by half-cycle basis |
| CN102780202A (en) * | 2011-05-09 | 2012-11-14 | 海洋王照明科技股份有限公司 | Overvoltage protection circuit and lamp |
| CN102833917A (en) * | 2012-08-29 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED constant-current control circuit and LED liquid crystal television |
| CN103687173A (en) * | 2012-09-17 | 2014-03-26 | 朗捷科技股份有限公司 | Universal linear LED drive circuit capable of de-flashing |
| CN103281834A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | Overvoltage protection circuit applied to alternative current LED drive system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793271A (en) * | 2016-12-09 | 2017-05-31 | 欧普照明股份有限公司 | The linear constant current circuit of overvoltage protection |
| CN106793271B (en) * | 2016-12-09 | 2019-05-24 | 欧普照明股份有限公司 | The linear constant current circuit of overvoltage protection |
| CN108811231A (en) * | 2017-05-05 | 2018-11-13 | 东莞艾笛森光电有限公司 | Dim optimized emission diode drive circuit |
| CN107182150A (en) * | 2017-06-30 | 2017-09-19 | 苏州菲达旭微电子有限公司 | A kind of linear constant current pipe bleeder circuit |
| CN107182150B (en) * | 2017-06-30 | 2023-10-24 | 苏州菲达旭微电子有限公司 | Linear constant current tube voltage dividing circuit |
| CN108601162A (en) * | 2018-07-03 | 2018-09-28 | 上海路傲电子科技有限公司 | LED illumination linear constant current driving circuit |
| CN108601162B (en) * | 2018-07-03 | 2021-07-06 | 上海路傲电子科技有限公司 | LED lighting linear constant current driving circuit |
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Application publication date: 20160907 |