CN105388950B - High temperature resistant constant current start-up circuit based on current mirror - Google Patents
High temperature resistant constant current start-up circuit based on current mirror Download PDFInfo
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- CN105388950B CN105388950B CN201510968883.XA CN201510968883A CN105388950B CN 105388950 B CN105388950 B CN 105388950B CN 201510968883 A CN201510968883 A CN 201510968883A CN 105388950 B CN105388950 B CN 105388950B
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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
- G05F1/561—Voltage to current converters
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- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
Abstract
High temperature resistant constant current start-up circuit based on current mirror, belongs to oil state modulator field, the present invention solves the problem using electric current regulation diode cannot complete startup task as start-up circuit when temperature is higher than 100 DEG C.The present invention includes NPN audion Q1, Q2, nmos pass transistor M, resistance R1, R2 and current regulator diode D1；Q1, Q2 and R1 constitute current-mirror structure；The electric current I2 flowing through Q1 and the electric current I1 flowing through Q2 colelctor electrode keeps equal；Total current I=I1+I2+I3 of start-up circuit, the electric current that in formula, I3 flows through in being M；When temperature is less than 100 DEG C, D1 it is responsible for regulating circuital current, to ensure that I is constant；When temperature is higher than 100 DEG C, along with temperature raises, the electric current regulating power of D1 declines, and I1 reduces, and I2 reduces therewith, and I3 increases, and the increments of I3 compensate for the reduction amount of I1, I2, and total current I keeps constant.
Description
Technical field
The present invention relates to a kind of circuit structure that starting current is provided, belong to oil state modulator field.
Background technology
In order to grasp down-hole reservoir information in real time, according to reservoir information, the duty of submersible electric pump is adjusted in time, needs
Submersible electric pump to be is equipped with down-hole multiparameter measuring device.Down-hole multiparameter measuring device is powered and transmission principle such as Fig. 1 institute
Showing, when down-hole multiparameter measuring device is powered by ground power supply system, the start-up circuit in the multiparameter measuring device of down-hole is first
First working, the electric power loop for system provides an initial current, and this electric current is that supply convertor provides initial power, electricity
Source converter work output galvanic current pressure is the power supplies such as temperature sensor, pressure transducer, signal conditioning circuit.Survey
Amount signal is converted into signal code timesharing by voltage after conditioning is amplified and is injected into electric power loop, then the electric power loop under stable state
In electric current be made up of initial current and signal code superposition, and the power of the supply convertor under stable state is by this two parts electric current
Common offer.
Powered by down-hole multiparameter measuring device and transmission principle figure is it can be seen that under initial situation, without start-up circuit
Thering is provided initial current, supply convertor can not be powered for sensor and other parts circuit, then do not have letter in electric power loop
Not having electric current in number electric current, i.e. electric power loop, supply convertor does not has input power, therefore down-hole measuring multiple parameters yet
Device cannot work.In sum, the start-up circuit of an initial current can be provided to be to ensure that downhole sensor for electric power loop
The key that can work.
The operating temperature down-hole multiparameter measuring device less than 100 DEG C typically uses electric current regulation diode as start-up circuit
Major part, electric current regulation diode can ensure that and flows through a fixing initial current under original state in electric power loop,
The minimum current flow through in current supply circuit when the amplitude of this initial current works less than multiparameter measuring device, the most again higher than electricity
Source translation circuit can work required minimum current, and therefore this initial current both can guarantee that power converting circuit can open
Dynamic, do not interfere with again the amplitude transmission compared with low signal.But, temperature factor has a strong impact on the characteristic of electric current regulation diode,
Along with temperature raises, the current value that electric current regulation diode can provide is decreased obviously, when temperature is higher than 100 DEG C, and electric current
The electric current that regulation diode provides is already below the minimum current needed for supply convertor work, and now down-hole measuring multiple parameters fills
Put and cannot start.So being badly in need of the start-up circuit of a kind of down-hole multiparameter measuring device, this start-up circuit can be in wider temperature
In the range of degree, one initial current of (25 DEG C 200 DEG C) output ensures that supply convertor can start.
Summary of the invention
The invention aims to solve to use electric current to regulate diode cannot when temperature is higher than 100 DEG C as start-up circuit
The problem completing startup task, it is provided that a kind of high temperature resistant constant current start-up circuit based on current mirror.This circuit is based on electric current
The high temperature resistant constant current start-up circuit of mirror, with the NPN audion 2N2222 of high temperature resistant 200 DEG C, electric current regulation diode
Based on 1N5297, N-channel MOS FET SCT30N120, design a down-hole multiparameter measuring device start-up circuit,
This circuit provides an initial current to drive power converting circuit the multiparameter measuring device of down-hole startup stage, and wider
Within the temperature range of (25 DEG C-200 DEG C), this initial current can ensure down-hole multiparameter measuring device power conversion electricity
Road can work, thus ensures that down-hole multiparameter measuring device can normally start.
High temperature resistant constant current start-up circuit based on current mirror of the present invention, it includes NPN audion Q1, NPN tri-pole
Pipe Q2, nmos pass transistor M, resistance R1, resistance R2 and current regulator diode D1；
Positive source Vin is simultaneously connected with the drain electrode of nmos pass transistor M, one end of resistance R2 and current regulator diode D1
Anode；
The grid of nmos pass transistor M is simultaneously connected with the other end of resistance R2, the colelctor electrode of NPN audion Q1 and electricity
One end of resistance R1；
The base stage of NPN audion Q1 is simultaneously connected with the other end and the base stage of NPN audion Q2 of resistance R1；
The colelctor electrode of NPN audion Q2 connects the negative electrode of current regulator diode D1；
The emitter stage of the source electrode of nmos pass transistor M, the emitter stage of NPN audion Q1 and NPN audion Q2 is simultaneously
Ground connection；
Wherein: NPN audion Q1, NPN audion Q2 and resistance R1 constitutes current-mirror structure；Flow through NPN tri-pole
The electric current I2 of pipe Q1 and the electric current I1 flowing through NPN audion Q2 colelctor electrode keeps equal；The total current of start-up circuit
I=I1+I2+I3, the electric current that in formula, I3 flows through in being nmos pass transistor M；
When temperature is less than 100 DEG C, current regulator diode D1 it is responsible for regulating circuital current, to ensure that total current I is constant；
When temperature is higher than 100 DEG C, along with temperature raises, the electric current regulating power of current regulator diode D1 declines, and flows through perseverance
The electric current I1 of stream diode D1 reduces, and I2 reduces therewith, and the voltage at resistance R2 two ends reduces, then the colelctor electrode of Q1-
Emitter voltage raises, i.e. the gate-source voltage V of nmos pass transistor MGSRaise, then I3 increases, the increments of I3
Compensate for the reduction amount of I1, I2, total current I keeps constant.
Advantages of the present invention: the present invention utilizes the grid voltage of the principle regulation MOSFET of current mirror, and then reconciles
The electric current regulating power of electric current regulation diode decay under hot environment is compensated by the drain current of MOSFET, electric current
The electric current flow through in regulation diode is the lowest, and the electric current flow through in current mirror is the lowest, but regulated by current mirror
It is the highest that MOSFET grid voltage but rises, and the electric current flow through in MOSFET is the biggest, and its ability compensated is the strongest.
Use the present invention 20 DEG C of-200 DEG C of scopes current output characteristics curve as shown in Figure 3, in accompanying drawing 3 another
Line is the start-up circuit the using uncompensated electric current regulation diode current output characteristics curve 20 DEG C of-200 DEG C of scopes.
The output electric current using the start-up circuit of uncompensated electric current regulation diode is reduced by 10.3mA in the range of 20 DEG C-200 DEG C
To 5.2mA, its fall percentage ratio is 49.5%.And use the output electric current of the start-up circuit of the present invention at 20 DEG C-200
Being reduced to 8.8mA by 9.57mA in the range of DEG C, its fall percentage ratio is 8.04%.It can be seen that the employing present invention is
Can solve to cause start-up circuit to export electric current owing to the electric current regulating power of electric current regulation diode declines under hot environment
The problem that ability significantly decays.
Accompanying drawing explanation
Fig. 1 is down-hole measuring multiple parameters theory diagram；
Fig. 2 is the physical circuit figure of high temperature resistant constant current start-up circuit based on current mirror of the present invention；
Fig. 3 is that the temperature profile using start-up circuit of the present invention output electric current exports electric current with conventionally employed current regulator diode
Temperature characterisitic correlation curve figure.
Detailed description of the invention
Detailed description of the invention one: present embodiment is described below in conjunction with Fig. 1 to Fig. 3, based on current mirror described in present embodiment
High temperature resistant constant current start-up circuit, it includes NPN audion Q1, NPN audion Q2, nmos pass transistor M, electricity
Resistance R1, resistance R2 and current regulator diode D1；
Positive source Vin is simultaneously connected with the drain electrode of nmos pass transistor M, one end of resistance R2 and current regulator diode D1
Anode；
The grid of nmos pass transistor M is simultaneously connected with the other end of resistance R2, the colelctor electrode of NPN audion Q1 and electricity
One end of resistance R1；
The base stage of NPN audion Q1 is simultaneously connected with the other end and the base stage of NPN audion Q2 of resistance R1；
The colelctor electrode of NPN audion Q2 connects the negative electrode of current regulator diode D1；
The emitter stage of the source electrode of nmos pass transistor M, the emitter stage of NPN audion Q1 and NPN audion Q2 is simultaneously
Ground connection；
Wherein: NPN audion Q1, NPN audion Q2 and resistance R1 constitutes current-mirror structure；Flow through NPN tri-pole
The electric current I2 of pipe Q1 and the electric current I1 flowing through NPN audion Q2 colelctor electrode keeps equal；The total current of start-up circuit
I=I1+I2+I3, the electric current that in formula, I3 flows through in being nmos pass transistor M；
When temperature is less than 100 DEG C, current regulator diode D1 it is responsible for regulating circuital current, to ensure that total current I is constant；
When temperature is higher than 100 DEG C, along with temperature raises, the electric current regulating power of current regulator diode D1 declines, and flows through perseverance
The electric current I1 of stream diode D1 reduces, and I2 reduces therewith, and the voltage at resistance R2 two ends reduces, then the colelctor electrode of Q1-
Emitter voltage raises, i.e. the gate-source voltage V of nmos pass transistor MGsRaise, then I3 increases, the increments of I3
Compensate for the reduction amount of I1, I2, total current I keeps constant.
NPN audion Q1, NPN audion Q2, nmos pass transistor M, resistance R1, resistance R2 and constant current two pole
Pipe D1 all uses the electrical equipment of resistance to 200 DEG C of high temperature above.
NPN audion Q1 and NPN audion Q2 uses model to be the audion of 2N2222.
The N-channel MOS FET that nmos pass transistor M uses model to be SCT30N120.
Current regulator diode D1 uses model to be the diode of 1N5297.
Operation principle:
Q1, Q2, R1 form a current mirroring circuit, due to Q1 and Q2 common base, common emitter, then execute for current mirror
When adding external power source, the electric current that both flow through in colelctor electrode is equal, i.e. I1 with I2 is equal.
The electric current I1 flow through in current regulator diode D1 flows mainly through the colelctor electrode of Q2, and a most small part is as triggering
Electric current flows into the base stage of Q1 and Q2.According to above-mentioned current mirror principle, the colelctor electrode of Q1 also flows through equal electric current I2.
The electric current I2 flow through in Q1 also flows through resistance R2 simultaneously, and MOSFET grid voltage is by the voltage at resistance R2 two ends
Impact, changes grid voltage and then can regulate the drain current of MOSFET, and the size of regulation resistance R2 can control
MOSFET grid, the height of source voltage, and then control the size of whole start-up circuit initial current, the grid of MOSFET-
Source voltage VGS=Vin-I2*R2, I3=VGS* g, g are the mutual conductance of MOSFET.Flow through in whole start-up circuit is all
Electric current I is the summation flowing through electric current in Q1, Q2 and MOSFET.
When temperature is increased to more than 100 DEG C, the electric current regulating power of current regulator diode D1 declines, and flows through current regulator diode
The electric current I1 of D1 reduces, then the electric current flow through in Q1 and Q2 also can reduce so that is connected on the resistance R2 of Q1 colelctor electrode
The voltage at two ends reduces, the gate-source voltage V of Q1 collector voltage namely MOSFETGSRaise, MOSFET flows
The electric current I3 crossed increases, and compensates the electric current reduced in Q1 and Q2, keeps start-up circuit total current I constant.
Claims (5)
1. high temperature resistant constant current start-up circuit based on current mirror, including NPN audion Q1, NPN audion Q2 and resistance
R1 constitutes current-mirror structure；
It is characterized in that, also include resistance R2, nmos pass transistor M and current regulator diode D1；
Positive source Vin is simultaneously connected with the drain electrode of nmos pass transistor M, one end of resistance R2 and current regulator diode D1's
Anode；
The grid of nmos pass transistor M is simultaneously connected with the other end of resistance R2, the colelctor electrode of NPN audion Q1 and resistance
One end of R1；
The base stage of NPN audion Q1 is simultaneously connected with the other end and the base stage of NPN audion Q2 of resistance R1；
The colelctor electrode of NPN audion Q2 connects the negative electrode of current regulator diode D1；
The emitter stage of the source electrode of nmos pass transistor M, the emitter stage of NPN audion Q1 and NPN audion Q2 is simultaneously
Ground connection；
Wherein: the electric current I2 flowing through NPN audion Q1 and the electric current I1 flowing through NPN audion Q2 colelctor electrode keeps phase
Deng；Total current I=I1+I2+I3 of start-up circuit, the electric current that in formula, I3 flows through in being nmos pass transistor M；
When temperature is less than 100 DEG C, current regulator diode D1 it is responsible for regulating circuital current, to ensure that total current I is constant；
When temperature is higher than 100 DEG C, along with temperature raises, the electric current regulating power of current regulator diode D1 declines, and flows through constant current
The electric current I1 of diode D1 reduces, and I2 reduces therewith, and the voltage at resistance R2 two ends reduces, then colelctor electrode-the transmitting of Q1
Pole tension raises, i.e. the gate-source voltage V of nmos pass transistor MGSRaise, then I3 increases, and the increments of I3 compensate for
The reduction amount of I1, I2, total current I keeps constant.
High temperature resistant constant current start-up circuit based on current mirror the most according to claim 1, it is characterised in that NPN tri-pole
Pipe Q1, NPN audion Q2, nmos pass transistor M, resistance R1, resistance R2 and current regulator diode D1 all use resistance to
The electrical equipment of 200 DEG C of high temperature above.
High temperature resistant constant current start-up circuit based on current mirror the most according to claim 1, it is characterised in that NPN tri-pole
Pipe Q1 and NPN audion Q2 uses model to be the audion of 2N2222.
High temperature resistant constant current start-up circuit based on current mirror the most according to claim 1, it is characterised in that NMOS crystal
The N-channel MOS FET that pipe M uses model to be SCT30N120.
High temperature resistant constant current start-up circuit based on current mirror the most according to claim 1, it is characterised in that current regulator diode
D1 uses model to be the diode of 1N5297.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510968883.XA CN105388950B (en) | 2015-12-21 | 2015-12-21 | High temperature resistant constant current start-up circuit based on current mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510968883.XA CN105388950B (en) | 2015-12-21 | 2015-12-21 | High temperature resistant constant current start-up circuit based on current mirror |
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| Publication Number | Publication Date |
|---|---|
| CN105388950A CN105388950A (en) | 2016-03-09 |
| CN105388950B true CN105388950B (en) | 2016-11-23 |
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|---|---|---|---|
| CN201510968883.XA Expired - Fee Related CN105388950B (en) | 2015-12-21 | 2015-12-21 | High temperature resistant constant current start-up circuit based on current mirror |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0620514A2 (en) * | 1993-04-06 | 1994-10-19 | Koninklijke Philips Electronics N.V. | Temperature-compensated voltage regulator |
| CN1529216A (en) * | 2003-10-17 | 2004-09-15 | 清华大学 | Reference current source of low-temp. coefficient and low power-supply-voltage coefficient |
| CN201041642Y (en) * | 2007-06-06 | 2008-03-26 | 华中科技大学 | A power supply deviation circuit with negative feedback |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2682175B2 (en) * | 1989-11-24 | 1997-11-26 | 松下電器産業株式会社 | Constant voltage circuit |
| JP5925465B2 (en) * | 2011-11-11 | 2016-05-25 | 新日本無線株式会社 | Constant current circuit |
-
2015
- 2015-12-21 CN CN201510968883.XA patent/CN105388950B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0620514A2 (en) * | 1993-04-06 | 1994-10-19 | Koninklijke Philips Electronics N.V. | Temperature-compensated voltage regulator |
| CN1529216A (en) * | 2003-10-17 | 2004-09-15 | 清华大学 | Reference current source of low-temp. coefficient and low power-supply-voltage coefficient |
| CN201041642Y (en) * | 2007-06-06 | 2008-03-26 | 华中科技大学 | A power supply deviation circuit with negative feedback |
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| CN105388950A (en) | 2016-03-09 |
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Granted publication date: 20161123 Termination date: 20211221 |