CN107708256A - Linear constant current electric light drive circuit, integrated circuit and control system - Google Patents
Linear constant current electric light drive circuit, integrated circuit and control system Download PDFInfo
- Publication number
- CN107708256A CN107708256A CN201710978996.7A CN201710978996A CN107708256A CN 107708256 A CN107708256 A CN 107708256A CN 201710978996 A CN201710978996 A CN 201710978996A CN 107708256 A CN107708256 A CN 107708256A
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- transistors
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- electric light
- constant current
- current
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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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention relates to semiconductor integrated circuit technical field, more particularly to a kind of linear constant current electric light drive circuit, integrated circuit and control system, wherein, the linear constant current electric light drive circuit includes start-up circuit, constant-current circuit, mirror image circuit.Advantage：The circuit utilizes the constant-current circuit with soft-sphere model circuit protection; the mirror image circuit load with pairing metal-oxide-semiconductor to be connected provides with automatic growth control, constant current constant voltage working environment; with higher PSRR; the change solved in input voltage can cause the change of whole system input power, so as to influence the light efficiency problem of the efficiency of system.
Description
Technical field
The present invention relates to semiconductor integrated circuit technical field, more particularly to a kind of linear constant current electric light drive circuit, collection
Into circuit and control system.
Background technology
Optical drive can be generally divided into three major types, when switch constant-current source, second, linear IC power supplys, third, resistance-capacitance depressurization is electric
Source.High pressure is changed into low pressure by switch constant-current source using transformer, and carries out rectifying and wave-filtering, to export stable low-voltage direct
Electricity, the security of switch constant-current source is of a relatively high (usually exporting low pressure), stable performance, shortcoming be circuit is complicated, price compared with
Height, to cause high cost, large volume, multicomponent device because which employs transformer, and electrochemical capacitor is perishable, and the whole lamp life-span is serious
Limited, light modulation is inconvenient；The scheme cost of resistance-capacitance depressurization is very low, but poor-performing；Linear constant current technical scheme is simple with its
System architecture be widely used in middle low power LED constant current system.
In the prior art, for common scheme as shown in figure 1, including rectification circuit, constant-current drive circuit and load, it is permanent
Stream output is Iout=Vref/Rcs.This application scheme is that system architecture is simple relative to Switching Power Supply scheme advantage, uses
Component is few, and shortcoming is that the quantity of system load must design in strict accordance with input voltage, and the change of input voltage can be led
The change of whole system input power is caused, so as to influence the light efficiency efficiency of system.With the continuous development of optical drive technology, CD-ROM drive
Move and obtain more and more extensive use in every field.When closely, optical drive power is small, can meet that eye-safe will
Ask, but driving force is weaker；When remote, optical drive power is big, but can not meet eye-safe requirement.
In summary, it is necessary to design a kind of automatic growth control, constant current constant voltage applied to unmanned plane, unmanned vehicle intelligence
Linear constant current electric light drive circuit, integrated circuit and the control system of identification.
The content of the invention
The present invention in view of the shortcomings of the prior art, proposes a kind of linear constant current electric light drive circuit, integrated circuit and control
System, the change solved in input voltage can cause the change of whole system input power, so as to influence the efficiency of system
Light efficiency problem.
To achieve the above object, the present invention adopts the following technical scheme that：
In a first aspect, the present invention proposes a kind of linear constant current electric light drive circuit, including：
Start-up circuit, power end is connect, the constant-current circuit to be connected provides soft start voltage；
Constant-current circuit, the mirror image circuit to be connected provide the bandgap voltage reference with PSRR；
Mirror image circuit, the bandgap voltage reference provided according to the constant-current circuit, the linear constant current electric light is controlled to drive
The loop voltage of circuit so that the loop voltage keeps constant；
The start-up circuit includes two transistor AND gates, one electric capacity, wherein：
The grid of first N transistors (N1), drain electrode are connected with the grid of the first P transistors (P1), and pass through first simultaneously
Electric capacity (C1) is connected with DC power supply terminal, source ground；
The source electrode of the first P transistors (P1) is connected with DC power supply terminal；
The constant-current circuit includes one operational amplifier, transistor AND gate resistance, wherein：
The source electrode of 2nd N transistors (N2) passes through the negative input end of first resistor (R1) and operational amplifier, adjustment circuit
Port is connected, and drain electrode is connected with the drain electrode of the first P transistors (P1)；
The positive input terminal of the operational amplifier is connected with reference voltage Vref, output end and the 2nd N transistors
(N2) grid connection；
The mirror image circuit includes four transistors, two electric light diodes and two resistance, wherein：
The drain electrodes of 2nd P transistors (P2), grid are simultaneously connected after connecing with the grid of the 3rd P transistors (P3), and by just
It is grounded to the first electric light diode (D1) of connection, the source electrode of source electrode and the 3rd N transistors (N3), the 4th N transistors (N4)
Source electrode, grid are connected, and the negative input end of operational amplifier in the constant-current circuit is connected to by second resistance (R2)；
The drain electrode of the 3rd P transistors (P3) and drain electrode, the leakage of the 3rd N transistors (N3) of the 4th N transistors (N4)
Pole, grid are connected, and the negative input end of operational amplifier in the constant-current circuit is connected to by 3rd resistor (R3), and source electrode leads to
Cross positive second electric light diode (D2) ground connection.
Preferably, the first electric light diode (D1) or the second electric light diode (D2) include single electric light diode or
Electric light diode string.
Preferably, the first electric light diode (D1) is identical with the launch site area of the second electric light diode (D2).
Preferably, the conduction level of the first electric light diode (D1) and the conduction level of the second electric light diode (D2)
It is consistent.
Preferably, the 2nd P transistors (P2) and the area equation of the 3rd P transistors (P3).
Preferably, the 3rd N transistors (N3) and the area equation of the 4th N transistors (N4).
Preferably, the transistor is using the one or more in FET, bipolar transistor.
Preferably, the first N transistors (N1), the 2nd N transistors (N2), the 3rd N transistors (N3) and the 4th N crystal
It is NMOS tube to manage (N4), and the first P transistors (P1), the 2nd P transistors (P2) and the 3rd P transistors (P3) are PMOS.
Second aspect, the present invention propose a kind of linear constant current integrated circuit, including the line described in adjustment circuit, first aspect
Property Constant Electric Current light drive circuit, the adjustment circuit includes the sampling resistor Rext of a ground connection, and the sampling resistor adjusts mirror image
Circuit D1, D2 are supported on the constant current hold in the unit interval.
The third aspect, the present invention propose a kind of linear constant current control system, including the line described in rectification circuit, first aspect
Property Constant Electric Current light drive circuit, the rectification circuit to alternating current carry out full-wave rectification, the start-up circuit of connection is powered.
Beneficial effects of the present invention：Linear constant current electric light drive circuit, integrated circuit and the control system of the present invention, utilize
Constant-current circuit with soft-sphere model circuit protection, the mirror image circuit load with pairing metal-oxide-semiconductor to be connected are provided with certainly
Dynamic gain control, constant current constant voltage working environment, has higher PSRR, solves the change meeting in input voltage
Cause the change of whole system input power, so as to influence the light efficiency problem of the efficiency of system.
Brief description of the drawings
With accompanying drawing, the invention will be further described, but the embodiment in accompanying drawing does not form any limitation of the invention.
Fig. 1 is the embodiment circuit diagram of prior art linear constant current electric light drive circuit one.
Fig. 2 is the example structure schematic diagram of linear constant current electric light drive circuit one of the present invention.
Embodiment
Technical solution of the present invention is further described with embodiment below in conjunction with the accompanying drawings, this is the preferable reality of the present invention
Apply example.A kind of linear constant current electric light drive circuit, integrated circuit and control system provided in an embodiment of the present invention can apply to
Each scene in Internet of Things intelligent identification technology field, including but not limited to 2G GSM, 3G CDMA, 4G LTE/LTE-A,
5G eMBB mobile communication, cluster communication, satellite communication, laser communication, fiber optic communication, DTV, radio frequency identification, electric power
The systems such as carrier wave, unmanned vehicle, unmanned plane, Internet of Things, radar, the embodiment of the present invention are not particularly limited to this.
The present invention proposes a kind of linear constant current electric light drive circuit, as shown in Fig. 2 including：
Start-up circuit, power end is connect, the constant-current circuit to be connected provides soft start voltage；
Constant-current circuit, the mirror image circuit to be connected provide the bandgap voltage reference with PSRR；
Mirror image circuit, the bandgap voltage reference provided according to constant-current circuit, control returning for linear Constant Electric Current light drive circuit
Road voltage so that loop voltage keeps constant；
In the present embodiment, start-up circuit includes two transistor AND gates, one electric capacity, wherein, the grid of the first N transistors (N1)
Pole, drain electrode are connected with the grid of the first P transistors (P1), and are connected by the first electric capacity (C1) with DC power supply terminal, source simultaneously
Pole is grounded；The source electrode of first P transistors (P1) is connected with DC power supply terminal.
In the present embodiment, constant-current circuit includes one operational amplifier, transistor AND gate resistance, wherein, the 2nd N
The source electrode of transistor (N2) is connected by the negative input end of first resistor (R1) and operational amplifier, adjustment circuit port, is drained
Drain electrode with the first P transistors (P1) is connected；The positive input terminal of operational amplifier is connected with reference voltage Vref, output end and the
The grid connection of two N transistors (N2).
In the present embodiment, mirror image circuit includes four transistors, two electric light diodes and two resistance, wherein, the 2nd P
The drain electrode of transistor (P2), grid simultaneously be connecteds after connecing with the grid of the 3rd P transistors (P3), and pass through it is positive connect it is first electric
Optical diode (D1) is grounded, and source electrode is connected with the source electrode of the 3rd N transistors (N3), source electrode, the grid of the 4th N transistors (N4),
And the negative input end of operational amplifier in constant-current circuit is connected to by second resistance (R2)；The drain electrode of 3rd P transistors (P3)
It is connected with the drain electrode, the drain electrode of the 3rd N transistors (N3), grid of the 4th N transistors (N4), and is connected by 3rd resistor (R3)
The negative input end of operational amplifier into constant-current circuit, source electrode are grounded by positive second electric light diode (D2).
In the present embodiment, the first electric light diode (D1) is identical with the launch site area of the second electric light diode (D2), leads
It is powered flat consistent, the first electric light diode (D1) or the second electric light diode (D2) include single electric light diode or electric light two
Pole pipe string.
In the present embodiment, the first N transistors (N1), the 2nd N transistors (N2), the 3rd N transistors (N3) and the 4th N crystal
It is NMOS tube to manage (N4), and the first P transistors (P1), the 2nd P transistors (P2) and the 3rd P transistors (P3) are PMOS.Wherein,
The area equation of 2nd P transistors (P2) and the 3rd P transistors (P3), the 3rd N transistors (N3) and the 4th N transistors (N4)
Area equation.
It should be noted that transistor can be using the one or more in FET, bipolar transistor.Transistor
Can also be the structure that the grid of depletion type N-channel MOS transistor and source electrode are connected, though it is not shown, but can certainly
It is the structure for being connected the grid of depletion type P channel MOS transistor with source electrode.
The linear constant current integrated circuit being made up of adjustment circuit, above-mentioned linear constant current electric light drive circuit, wherein, adjustment
Circuit includes the sampling resistor Rext of a ground connection, and the sampling resistor regulation mirror image circuit D1, D2 are supported on the electricity in the unit interval
Stream keeps constant.
The operation principle of the present invention：It is made up of the first P transistors (P1), the first N transistors (N1) with the first electric capacity (C1)
Drive circuit provide floppy drive rotating ring for the constant-current circuit that automatically controls being made up of operational amplifier and the 2nd N transistors (N2)
Border, the mirror image circuit for automatically controlling constant-current circuit to be made up of with the 3rd P transistors (P3) the second P transistors (P2), which provides, to be had
The constant current constant voltage of PSRR, also, the MOS transistor of pairing is added at the both ends of mirror current source, to prevent mirror image electricity
Stream source enters the mismatch of circuit ratio caused by saturation region, and these measures ensure the first electric light diode (D1) and the second electric light
Diode (D2) normal work under stable condition of work.
The present invention also proposes a kind of linear constant current control system, including the driving of rectification circuit, above-mentioned linear constant current electric light
Circuit, rectification circuit carry out full-wave rectification to alternating current, the start-up circuit of connection are powered.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
- A kind of 1. linear constant current electric light drive circuit, it is characterised in that including：Start-up circuit, power end is connect, the constant-current circuit to be connected provides soft start voltage；Constant-current circuit, the mirror image circuit to be connected provide the bandgap voltage reference with PSRR；Mirror image circuit, the bandgap voltage reference provided according to the constant-current circuit, controls the linear constant current electric light drive circuit Loop voltage so that the loop voltage keeps constant；The start-up circuit includes two transistor AND gates, one electric capacity, wherein：The grid of first N transistors (N1), drain electrode are connected with the grid of the first P transistors (P1), and pass through the first electric capacity simultaneously (C1) it is connected with DC power supply terminal, source ground；The source electrode of the first P transistors (P1) is connected with DC power supply terminal；The constant-current circuit includes one operational amplifier, transistor AND gate resistance, wherein：The source electrode of 2nd N transistors (N2) passes through the negative input end of first resistor (R1) and operational amplifier, adjustment circuit port Connection, drain electrode are connected with the drain electrode of the first P transistors (P1)；The positive input terminal of the operational amplifier is connected with reference voltage Vref, output end and the 2nd N transistors (N2) Grid connects；The mirror image circuit includes four transistors, two electric light diodes and two resistance, wherein：The drain electrodes of 2nd P transistors (P2), grid simultaneously be connecteds after connecing with the grid of the 3rd P transistors (P3), and pass through positive company The first electric light diode (D1) ground connection connect, the source electrode of source electrode and the 3rd N transistors (N3), the source electrode of the 4th N transistors (N4), Grid is connected, and the negative input end of operational amplifier in the constant-current circuit is connected to by second resistance (R2)；The drain electrode of the 3rd P transistors (P3) and the drain electrode of the 4th N transistors (N4), the drain electrode of the 3rd N transistors (N3), grid Pole is connected, and the negative input end of operational amplifier in the constant-current circuit is connected to by 3rd resistor (R3), and source electrode passes through just It is grounded to the second electric light diode (D2).
- 2. linear constant current electric light drive circuit according to claim 1, it is characterised in that the first electric light diode (D1) or the second electric light diode (D2) includes single electric light diode or electric light diode string.
- 3. linear constant current electric light drive circuit according to claim 2, it is characterised in that the first electric light diode (D1) it is identical with the launch site area of the second electric light diode (D2).
- 4. linear constant current electric light drive circuit according to claim 2, it is characterised in that the first electric light diode (D1) conduction level is consistent with the conduction level of the second electric light diode (D2).
- 5. linear constant current electric light drive circuit according to claim 1, it is characterised in that the 2nd P transistors (P2) With the area equation of the 3rd P transistors (P3).
- 6. linear constant current electric light drive circuit according to claim 1, it is characterised in that the 3rd N transistors (N3) With the area equation of the 4th N transistors (N4).
- 7. according to any described linear constant current electric light drive circuits of claim 1-6, it is characterised in that the transistor uses One or more in FET, bipolar transistor.
- 8. linear constant current electric light drive circuit according to claim 7, it is characterised in that the first N transistors (N1), 2nd N transistors (N2), the 3rd N transistors (N3) and the 4th N transistors (N4) they are NMOS tube, the first P transistors (P1), 2nd P transistors (P2) and the 3rd P transistors (P3) are PMOS.
- 9. a kind of linear constant current integrated circuit, it is characterised in that including the line described in adjustment circuit, claim any one of 1-8 Property Constant Electric Current light drive circuit, the adjustment circuit includes the sampling resistor Rext of a ground connection, and the sampling resistor adjusts mirror image Circuit D1, D2 are supported on the constant current hold in the unit interval.
- 10. a kind of linear constant current control system, it is characterised in that including the line described in rectification circuit, claim any one of 1-8 Property Constant Electric Current light drive circuit, the rectification circuit to alternating current carry out full-wave rectification, the start-up circuit of connection is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710978996.7A CN107708256A (en) | 2017-10-19 | 2017-10-19 | Linear constant current electric light drive circuit, integrated circuit and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710978996.7A CN107708256A (en) | 2017-10-19 | 2017-10-19 | Linear constant current electric light drive circuit, integrated circuit and control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107708256A true CN107708256A (en) | 2018-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710978996.7A Pending CN107708256A (en) | 2017-10-19 | 2017-10-19 | Linear constant current electric light drive circuit, integrated circuit and control system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370035A (en) * | 2001-02-08 | 2002-09-18 | 精工电子有限公司 | LED drive circuit |
| CN103218001A (en) * | 2013-04-15 | 2013-07-24 | 无锡普雅半导体有限公司 | Soft-start voltage adjusting circuit |
| CN103281832A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | Electric current soft-starting circuit for driving alternating-current LED |
-
2017
- 2017-10-19 CN CN201710978996.7A patent/CN107708256A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370035A (en) * | 2001-02-08 | 2002-09-18 | 精工电子有限公司 | LED drive circuit |
| CN103218001A (en) * | 2013-04-15 | 2013-07-24 | 无锡普雅半导体有限公司 | Soft-start voltage adjusting circuit |
| CN103281832A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | Electric current soft-starting circuit for driving alternating-current LED |
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Application publication date: 20180216 |