CN107708257A - 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
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- CN107708257A CN107708257A CN201710979500.8A CN201710979500A CN107708257A CN 107708257 A CN107708257 A CN 107708257A CN 201710979500 A CN201710979500 A CN 201710979500A CN 107708257 A CN107708257 A CN 107708257A
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- transistors
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- electric light
- 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; scaled mirror circuit load to be connected, which provides, has 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 transistors, two resistance and an electric capacity, wherein：
The grid of first P transistors (P1), drain electrode pass through second resistance (R2) and the grid of the first N transistors (N1) simultaneously
Connection, and be grounded by the first electric capacity (C1)；
The drain electrode of the first N transistors (N1) is connected to dc source simultaneously with the first P transistors (P1) source electrode
End, grid, source crossover 3rd resistor (R3)；
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 source electrode of the first N transistors (N1)；
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 three transistors, two electric light diodes and two resistance, wherein：
The grid of 3rd N transistors (N3) is connected with the grid of the 4th N transistors (N4), and drain electrode passes through second resistance (R2)
It is connected with the negative input end of operational amplifier in the constant-current circuit, source electrode is grounded by positive first electric light diode (D1)；
The drain electrode of the 4th N transistors (N4) passes through operational amplifier in first resistor (R1) and the constant-current circuit
Negative input end is connected, and source electrode is grounded by positive second electric light diode (D2)；
The drain electrode of 5th N transistors (N5) is connected with the negative input end of operational amplifier in the constant-current circuit, grid, source
The drain electrode with the 4th N transistors (N4), grid are connected respectively for pole.
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 3rd N transistors (N3) and the area equation of the 4th N transistors (N4).
Preferably, the area of the 5th N transistors (N5) is the 3rd N transistors (N3) or the 4th N transistors
(N4) 2-10 times of area.
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), the 4th N crystal
It is NMOS tube to manage (N4) and the 5th N transistors (N5), and the first P transistors (P1) 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 scaled mirror circuit load to be connected, which provides, has automatic growth control
, the working environment of constant current constant voltage, there is higher PSRR, the change solved in input voltage can cause be entirely
The change for input power of uniting, 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 transistors, two resistance and an electric capacity, wherein, the first P transistors
(P1) grid, drain electrode are connected with the grid of the first N transistors (N1) by second resistance (R2), and pass through the first electric capacity simultaneously
(C1) it is grounded；The drain electrodes of first N transistors (N1) and the first P transistors (P1) source electrode are connected to DC power supply terminal simultaneously, grid,
Source crossover 3rd resistor (R3).
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
It is connected with the source electrode of the first N transistors (N1)；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 three transistors, two electric light diodes and two resistance, wherein, the 3rd N
The grid of transistor (N3) is connected with the grid of the 4th N transistors (N4), and drain electrode passes through in second resistance (R2) and constant-current circuit
The negative input end connection of operational amplifier, source electrode are grounded by positive first electric light diode (D1)；4th N transistors (N4)
Drain electrode is connected by first resistor (R1) with the negative input end of operational amplifier in constant-current circuit, and source electrode passes through positive second electric light
Diode (D2) is grounded；The negative input end connection of operational amplifier, grid in the drain electrode of 5th N transistors (N5) and constant-current circuit
The drain electrode with the 4th N transistors (N4), grid are connected respectively for pole, source electrode.
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), the 4th N crystal
It is NMOS tube to manage (N4) and the 5th N transistors (N5), and the first P transistors (P1) are PMOS.Wherein, the 3rd N transistors (N3)
With the area equation of the 4th N transistors (N4), the area of the 5th N transistors (N5) is the 3rd N transistors (N3) or the 4th N crystal
Manage 2-10 times of the area of (N4).
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：By the first P transistors (P1), the first N transistors (N1), second resistance (R2), the 3rd
Resistance (R3) and the drive circuit that the first electric capacity (C1) is formed are automatic to be made up of operational amplifier with the 2nd N transistors (N2)
Constant-current circuit is controlled to provide soft-sphere model environment, it is by the 3rd N transistors (N3), the 4th N transistors to automatically control constant-current circuit
(N4) the scaled mirror circuit formed with the 5th N transistors (N5) provides the constant current constant voltage with PSRR, 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 transistors, two resistance and an electric capacity, wherein：The grid of first P transistors (P1), drain electrode are connected by the grid of second resistance (R2) and the first N transistors (N1) simultaneously Connect, and be grounded by the first electric capacity (C1)；The drain electrode of the first N transistors (N1) is connected to DC power supply terminal simultaneously with the first P transistors (P1) source electrode, grid Pole, source crossover 3rd resistor (R3)；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 source electrode of the first N transistors (N1)；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 three transistors, two electric light diodes and two resistance, wherein：The grid of 3rd N transistors (N3) is connected with the grid of the 4th N transistors (N4), and drain electrode passes through second resistance (R2) and institute The negative input end connection of operational amplifier in constant-current circuit is stated, source electrode is grounded by positive first electric light diode (D1)；The drain electrode of the 4th N transistors (N4) by first resistor (R1) with the constant-current circuit operational amplifier it is negative defeated Enter end connection, source electrode is grounded by positive second electric light diode (D2)；The drain electrode of 5th N transistors (N5) is connected with the negative input end of operational amplifier in the constant-current circuit, grid, source electrode point Drain electrode, grid not with the 4th N transistors (N4) are connected.
- 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 3rd N transistors (N3) With the area equation of the 4th N transistors (N4).
- 6. linear constant current electric light drive circuit according to claim 5, it is characterised in that the 5th N transistors (N5) Area be the 3rd N transistors (N3) or the 4th N transistors (N4) 2-10 times of area.
- 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), the 4th N transistors (N4) and the 5th N transistors (N5) are NMOS tube, described First P transistors (P1) 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 |
|---|---|---|---|
| CN201710979500.8A CN107708257A (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 |
|---|---|---|---|
| CN201710979500.8A CN107708257A (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 |
|---|---|
| CN107708257A true CN107708257A (en) | 2018-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710979500.8A Pending CN107708257A (en) | 2017-10-19 | 2017-10-19 | Linear constant current electric light drive circuit, integrated circuit and control system |
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| CN (1) | CN107708257A (en) |
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 CN201710979500.8A patent/CN107708257A/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 |