CN109407746A - A kind of refrigeration type infrared detector low noise power supply power supply circuit - Google Patents
A kind of refrigeration type infrared detector low noise power supply power supply circuit Download PDFInfo
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- CN109407746A CN109407746A CN201811398449.2A CN201811398449A CN109407746A CN 109407746 A CN109407746 A CN 109407746A CN 201811398449 A CN201811398449 A CN 201811398449A CN 109407746 A CN109407746 A CN 109407746A
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- resistance
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- detector
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The present invention relates to a kind of refrigeration type infrared detector low noise power supply power supply circuits, driving voltage needed for generating detector by linear power supply, then operational amplifier is used, resistance capacitance and triode form profound and negative feedbck, form power supply noise filter circuit, the power supply noise of linear power supply output is filtered, in the case where guaranteeing detector supply current, the driving voltage for supplying detector is set to meet detector for the requirement for electrical noise for electrical noise, to provide the signal-to-noise ratio of detector assembly, infrared detector is improved for the detection performance of Weak target, and there are preferable engineering practicability and using flexible.
Description
Technical field
The invention belongs to infrared data's acquisition technical fields, are related to a kind of refrigeration type infrared detector low noise power supply power supply
Circuit.
Background technique
Since infrared detector is used for small signal sensor, belong to highly sensitive device, noise to power supply and
Ripple is more demanding.The driving voltage power supply of conventional detectors is powered using the linear power supply of low noise, but linear power supply is only
It is able to satisfy the requirement of detector driving circuit and is unable to satisfy requirement of the detector driving voltage to noise and ripple, to reduce
The signal-to-noise ratio of detector, influences infrared detector for the detection performance of Weak target.In view of the above problems, proposing a kind of system
Cold mould infrared detector low noise power supply method of supplying power to, this method are formed by operational amplifier, resistance capacitance and triode
Profound and negative feedbck forms power supply noise filter circuit, is filtered to the power supply noise of linear power supply output, is guaranteeing detector
Under supply current, the driving voltage of supply detector is effectively improved for electrical noise, in the image quality and its detection for improving system
While performance, neither change the operation complexity of system, and preferably engineering practicability and using flexible.
Summary of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes that a kind of refrigeration type infrared detector low noise power supply supplies
Circuit, eliminating the interference of the detector due to caused by detector power supply noise and ripple and signal-to-noise ratio reduces problem, improves
The image quality and its detection performance of infrared imaging system.
Technical solution
A kind of refrigeration type infrared detector low noise power supply power supply circuit, it is characterised in that including R1 resistance and C2 capacitor,
Second level RC filter circuit, the operational amplifier, triode that level-one filter circuit, RF resistance and the C1 capacitor of C3 capacitor composition form
Q1 and R3 resistance composition expand current circuit, diode V1 voltage compensation and R2 resistance, R4 resistance, RG resistance, L1 inductance,
C4 capacitor, C5 capacitor, C6 capacitor and C7 capacitor；Input terminal passes through the parallel circuit of R1 resistance and two C2 capacitors and C3 capacitor,
Then the port INA+ of operational amplifier is connected；The port INA- of operational amplifier exports the port VOUTA simultaneously through RG resistance eutral grounding
Join the negative terminal of C1 capacitor and diode V1；The anode parallel connection R2 resistance and R3 resistance of diode V1, R3 resistance connecting triode Q1
Base stage, emitter-base bandgap grading parallel connection R4 resistance, RF resistance and the C4 capacitor of triode Q1 simultaneously connect output end VR；R4 resistance eutral grounding；C1 electricity
Hold, RF resistance is through RG resistance eutral grounding, C4 capacity earth；The collector of triode Q1 is through L1 inductance connection AVDD-P5V, through C5 electricity
Appearance, C6 capacitor and C7 capacitor earth；The base stage and collector of R2 resistance bridging triode Q1.
The operational amplifier uses AD8028.
The triode Q1 uses the triode of β=50.
The numerical value of the resistance and capacitance component are as follows: R1 resistance=1K, C2 capacitor=0.1 μ F, C3 capacitor=10 μ F,
RF resistance=10K, C1 capacitor=0.1 μ F, R2 resistance=1K, resistance=10 ohm R3, R4 resistance=100K, RG resistance=
The Europe 10K, L1=600, C4 capacitor=0.1 μ F, C5 capacitor=10 μ F, C6 capacitors=0.1 μ F, C7 capacitor=0.1 μ F.
Beneficial effect
A kind of refrigeration type infrared detector low noise power supply power supply circuit proposed by the present invention generates spy by linear power supply
Then driving voltage needed for surveying device forms profound and negative feedbck, composition electricity using operational amplifier, resistance capacitance and triode
Source noise filter circuit is filtered the power supply noise of linear power supply output, in the case where guaranteeing detector supply current, makes to supply
The driving voltage of detector meets detector for the requirement for electrical noise for electrical noise, to provide the noise of detector assembly
Than improving infrared detector for the detection performance of Weak target, and have preferable engineering practicability and using flexible.
The present invention has the advantage that is with beneficial effect: the present invention passes through operational amplifier, resistance capacitance and triode
Profound and negative feedbck is formed, power supply noise filter circuit is formed, the power supply noise of linear power supply output is filtered, is guaranteeing to visit
Survey under device supply current, be effectively improved the driving voltage of supply detector for electrical noise, so as to improve system image quality and
Its detection performance, while this method neither changes the operation complexity of system, and preferably engineering practicability and using flexible, makes
This method can be with flexible Application in all kinds of infrared imaging systems and infrared detection system.
Detailed description of the invention
Fig. 1 is physical circuit realization principle figure of the invention
Fig. 2 is detector power supply noise power spectrum analogous diagram of the invention
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
The present embodiment includes level-one filter circuit, RF resistance and the C1 capacitance group that R1 resistance and C2 capacitor, C3 capacitor form
At second level RC filter circuit, operational amplifier, triode Q1 and R3 resistance composition expand current circuit, diode V1 voltage mend
It repays and R2 resistance, R4 resistance, RG resistance, L1 inductance, C4 capacitor, C5 capacitor, C6 capacitor and C7 capacitor；
The operational amplifier uses AD8028.
The triode Q1 uses the triode of β=50.
The numerical value of the resistance and capacitance component are as follows: R1 resistance=1K, C2 capacitor=0.1 μ F, C3 capacitor=10 μ F,
RF resistance=10K, C1 capacitor=0.1 μ F, R2 resistance=1K, resistance=10 ohm R3, R4 resistance=100K, RG resistance=
The Europe 10K, L1=600, C4 capacitor=0.1 μ F, C5 capacitor=10 μ F, C6 capacitors=0.1 μ F, C7 capacitor=0.1 μ F.
Each device connection relationship are as follows:
Input terminal passes through the parallel circuit of R1 resistance and two C2 capacitors and C3 capacitor, then connects operational amplifier
The port INA+；The port INA- of operational amplifier exports the port VOUTA parallel connection C1 capacitor and diode V1's through RG resistance eutral grounding
Negative terminal；The anode parallel connection R2 resistance and R3 resistance of diode V1, the base stage of R3 resistance connecting triode Q1, the emitter-base bandgap grading of triode Q1
R4 resistance, RF resistance and C4 capacitor in parallel simultaneously connect output end VR；R4 resistance eutral grounding；C1 capacitor, RF resistance connect through RG resistance
Ground, C4 capacity earth；The collector of triode Q1 is through L1 inductance connection AVDD-P5V, simultaneously through C5 capacitor, C6 capacitor and C7 capacitor
Connection ground；The base stage and collector of R2 resistance bridging triode Q1.
The course of work:
Detector driving power DA_VR uses low noise linear power supply LT1761；
It is anti-that deep negative is formed using low noise operational amplifier AD8028, resistance capacitance, diode V1 and triode Q1
Feedback forms power supply noise filter circuit, and structure type is as shown in the picture, carries out to the detector driving power DA_VR of output
Filtering obtains detector low noise power supply VR；
Level-one filter circuit forms level-one RC filter circuit by 1K resistance and 10 μ F capacitors and drives electricity to the detector of output
Source DA_VR power supply noise carries out level-one filtering, filters out its low frequency range noise；
The profound and negative feedbck second level RC filter being made of operational amplifier AD8028, feedback capacity C1 and feedback resistance RF
Wave circuit carries out secondary filter to the detector driving power DA_VR power supply noise of output, filters out its high channel noise；
Obtain the low noise driving power VR of detector；
The expansion current circuit of operational amplifier is made of triode Q1, is eliminated the small detector that is not able to satisfy of amplifier driving current and is supplied
The shortcomings that electric current requirements, makes the electric current of VR output end meet detector driving circuit demand；The drive of operational amplifier AD8028
Streaming current is 10mA, selects the triode of β=50, thus the driving current of the driving circuit is up to 500mA, meets detector
The demand of driving current 100mA；
It is identical using the tube voltage drop and triode of diode, voltage compensating circuit is formed by diode V1, is compensated by three poles
Pipe Q1 bring 0.4V~0.7V tube voltage drop, to eliminate since addition triode Q1 expands current circuit bring VR voltage and DA_
VR voltage is unequal；
This circuit design obtains other the required low noise power supplies for meeting refrigeration type infrared detector.
Claims (4)
1. a kind of refrigeration type infrared detector low noise power supply power supply circuit, it is characterised in that including R1 resistance and C2 capacitor, C3
Second level RC filter circuit, the operational amplifier, triode Q1 that level-one filter circuit, RF resistance and the C1 capacitor of capacitor composition form
With the expansion current circuit of R3 resistance composition, the voltage compensation of diode V1 and R2 resistance, R4 resistance, RG resistance, L1 inductance, C4 electricity
Appearance, C5 capacitor, C6 capacitor and C7 capacitor；Input terminal passes through the parallel circuit of R1 resistance and two C2 capacitors and C3 capacitor, then
Connect the port INA+ of operational amplifier；The port INA- of operational amplifier exports the port VOUTA parallel connection C1 through RG resistance eutral grounding
The negative terminal of capacitor and diode V1；The anode parallel connection R2 resistance and R3 resistance of diode V1, the base of R3 resistance connecting triode Q1
Pole, emitter-base bandgap grading parallel connection R4 resistance, RF resistance and the C4 capacitor of triode Q1 simultaneously connect output end VR；R4 resistance eutral grounding；C1 capacitor, RF
Resistance is through RG resistance eutral grounding, C4 capacity earth；The collector of triode Q1 is through L1 inductance connection AVDD-P5V, through C5 capacitor, C6
Capacitor and C7 capacitor earth；The base stage and collector of R2 resistance bridging triode Q1.
2. refrigeration type infrared detector low noise power supply power supply circuit according to claim 1, it is characterised in that: the operation
Amplifier uses AD8028.
3. refrigeration type infrared detector low noise power supply power supply circuit according to claim 1, it is characterised in that: three pole
Pipe Q1 uses the triode of β=50.
4. the according to claim 1 or 2 or 3 refrigeration type infrared detector low noise power supply power supply circuits, it is characterised in that: institute
State the numerical value of resistance and capacitance component are as follows: R1 resistance=1K, C2 capacitor=0.1 μ F, C3 capacitor=10 μ F, RF resistance=10K,
C1 capacitor=0.1 μ F, R2 resistance=1K, resistance=10 ohm R3, R4 resistance=100K, RG resistance=10K, the Europe L1=600, C4
Capacitor=0.1 μ F, C5 capacitor=10 μ F, C6 capacitors=0.1 μ F, C7 capacitor=0.1 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811398449.2A CN109407746A (en) | 2018-11-22 | 2018-11-22 | A kind of refrigeration type infrared detector low noise power supply power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811398449.2A CN109407746A (en) | 2018-11-22 | 2018-11-22 | A kind of refrigeration type infrared detector low noise power supply power supply circuit |
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| CN109407746A true CN109407746A (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811398449.2A Pending CN109407746A (en) | 2018-11-22 | 2018-11-22 | A kind of refrigeration type infrared detector low noise power supply power supply circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466573A (en) * | 2015-12-05 | 2016-04-06 | 中国航空工业集团公司洛阳电光设备研究所 | A medium-long wave two-waveband thermal infrared imager |
| CN106595869A (en) * | 2016-11-28 | 2017-04-26 | 中国航空工业集团公司洛阳电光设备研究所 | High-resolution refrigeration-type infrared thermal imager |
| EP3287755A1 (en) * | 2016-08-24 | 2018-02-28 | Excelitas Technologies Singapore Pte. Ltd. | Infrared presence sensing with modeled background subtraction |
-
2018
- 2018-11-22 CN CN201811398449.2A patent/CN109407746A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466573A (en) * | 2015-12-05 | 2016-04-06 | 中国航空工业集团公司洛阳电光设备研究所 | A medium-long wave two-waveband thermal infrared imager |
| EP3287755A1 (en) * | 2016-08-24 | 2018-02-28 | Excelitas Technologies Singapore Pte. Ltd. | Infrared presence sensing with modeled background subtraction |
| CN106595869A (en) * | 2016-11-28 | 2017-04-26 | 中国航空工业集团公司洛阳电光设备研究所 | High-resolution refrigeration-type infrared thermal imager |
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Application publication date: 20190301 |