CN107682963A - 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 PDF

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Publication number
CN107682963A
CN107682963A CN201710996600.1A CN201710996600A CN107682963A CN 107682963 A CN107682963 A CN 107682963A CN 201710996600 A CN201710996600 A CN 201710996600A CN 107682963 A CN107682963 A CN 107682963A
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CN
China
Prior art keywords
transistors
circuit
electric light
constant current
current
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Pending
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CN201710996600.1A
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Chinese (zh)
Inventor
李全峰
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Dongguan Informative Mdt Infotech Ltd
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Dongguan Informative Mdt Infotech Ltd
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Priority to CN201710996600.1A priority Critical patent/CN107682963A/en
Publication of CN107682963A publication Critical patent/CN107682963A/en
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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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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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  • Control Of Electrical Variables (AREA)

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; mirror image 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

Linear constant current electric light drive circuit, integrated circuit and control system
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 two transistors, two electric light diodes, wherein：
The grid of 2nd P transistors (P2), drain and connect, while be connected to the grid of the 3rd P transistors (P3), and pass through It is grounded by positive first electric light diode (D1)；
The source electrode of 3rd P transistors (P3) is connected to the Constant Electric Current simultaneously with the source electrode of the 2nd P transistors (P2) The negative input end of operational amplifier in road, drain electrode are grounded by positive second electric light diode (D2).
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 area of the 2nd P transistors (P2) or the 3rd P transistors (P3) is the 2nd N transistors (N2) 3-9 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) are NMOS tube, the first P transistors (P1), the 2nd P transistors (P2), 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 to be connected provide with automatic growth control, permanent The working environment of constant pressure is flowed, there is higher PSRR, the change solved in input voltage can cause whole system defeated Enter the change of 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 two transistors, two electric light diodes, wherein, the 2nd P transistors (P2) Grid, drain and connect, while be connected to the grid of the 3rd P transistors (P3), and by passing through positive first electric light diode (D1) it is grounded；The source electrode of 3rd P transistors (P3) and the source electrode of the 2nd P transistors (P2) are connected to computing in constant-current circuit simultaneously The negative input end of amplifier, drain 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) are NMOS tube, the first P transistors (P1), Two P transistors (P2), the 3rd P transistors (P3) are PMOS.Wherein, the 2nd P transistors (P2) and the 3rd P transistors (P3) The area of area equation, the 2nd P transistors (P2) or the 3rd P transistors (P3) is 3-9 times of the area of the 2nd N transistors (N2).
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 Driving 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, these measures ensure the first electric light diode (D1) with the second electric light diode (D2) stable Condition of work under normal 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)

  1. 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 two transistors, two electric light diodes, wherein：
    The grid of 2nd P transistors (P2), drain and connect, while be connected to the grid of the 3rd P transistors (P3), and by passing through Positive first electric light diode (D1) ground connection；
    The source electrode of 3rd P transistors (P3) is connected in the constant-current circuit simultaneously with the source electrode of the 2nd P transistors (P2) The negative input end of operational amplifier, drain electrode are grounded by positive second electric light diode (D2).
  2. 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. 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. 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. 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. 6. linear constant current electric light drive circuit according to claim 5, it is characterised in that the 2nd P transistors (P2) Or the 3rd P transistors (P3) area be the 2nd N transistors (N2) 3-9 times of area.
  7. 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. 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) are NMOS tube, and the first P transistors (P1), the 2nd P transistors (P2), the 3rd P transistors (P3) are PMOS.
  9. 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. 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.
CN201710996600.1A 2017-10-19 2017-10-19 Linear constant current electric light drive circuit, integrated circuit and control system Pending CN107682963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710996600.1A CN107682963A (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
CN201710996600.1A CN107682963A (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
CN107682963A true CN107682963A (en) 2018-02-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN106604481A (en) * 2017-02-20 2017-04-26 王汉忠 LED linear constant current soft start drive circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN106604481A (en) * 2017-02-20 2017-04-26 王汉忠 LED linear constant current soft start drive circuit

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Application publication date: 20180209