CN203289321U - High-temperature high-end constant current source circuit - Google Patents
High-temperature high-end constant current source circuit Download PDFInfo
- Publication number
- CN203289321U CN203289321U CN2013203161379U CN201320316137U CN203289321U CN 203289321 U CN203289321 U CN 203289321U CN 2013203161379 U CN2013203161379 U CN 2013203161379U CN 201320316137 U CN201320316137 U CN 201320316137U CN 203289321 U CN203289321 U CN 203289321U
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- resistance
- effect transistor
- field effect
- operational amplifier
- pmos field
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Abstract
The utility model provides a high-temperature high-end constant current source circuit adopting high temperature devices. The constant current source circuit consists of an operational amplifier, two PMOS tubes, a voltage stabilizing diode, a plurality of resistors and capacitors. Through comparison of a voltage value of high-end current sampling conversion with an adjustment value of a presetting constant current value, constant current is determined to output. A constant current value can be realized by adjusting a voltage stabilization value and a voltage-dividing resistance value of the voltage stabilizing diode, and is several milliamperes to more than 10 milliamperes.
Description
Technical field
The utility model relates to the high-end constant-current source circuit of a kind of high temperature.
Background technology
When the instruments such as development oil reservoir logging, wireless drilling instrument, need the high-end constant-current source of 150 ℃ of a kind of heatproofs.The constant-current source chip operation temperature of buying in the market can only reach 125 ℃, can't meet the requirement of measuring deep-well., because logger uses powered battery, require constant-current source to come the power consumption of body extremely low simultaneously.
The utility model content
Control to power supply needs the utility model for instruments such as oil reservoir loggings, and the high-end constant-current source circuit of high temperature of 150 ℃ of a kind of heatproofs is provided.
The utility model adopts following technical solution:
The high-end constant-current source circuit of a kind of high temperature, comprise the operational amplifier power supply circuits, power amplification circuit, constant current value Circuit tuning;
Described operational amplifier power supply circuits comprise power supply, the first resistance, voltage stabilizing didoe, PMOS field effect transistor and an electric capacity; Described positive source is connected with voltage stabilizing didoe positive pole, electric capacity, operational amplifier respectively, power cathode is connected with the first resistance, the drain electrode of a PMOS field effect transistor, load respectively, the grid of a described PMOS field effect transistor connects respectively voltage stabilizing didoe negative pole and the first resistance, and the source electrode of a described PMOS field effect transistor connects respectively electric capacity, the 3rd resistance, operational amplifier;
Described power amplification circuit comprises operational amplifier, the second resistance, the 3rd resistance, the 4th resistance; The operational amplifier in-phase input end connects respectively the 3rd resistance, the second resistance; The second resistance connects an end of the 4th resistance, and the other end of the 4th resistance is the source electrode of concatenation operation amplifier inverting input, the 2nd PMOS field effect transistor respectively;
Described constant current value Circuit tuning comprises the 2nd PMOS field effect transistor, the 5th resistance, diode; The grid of the 2nd PMOS field effect transistor connects respectively the 5th resistance, operational amplifier output terminal; The source electrode of the 2nd PMOS field effect transistor also is connected with the 5th resistance, diode cathode respectively, and the drain electrode of the 2nd PMOS field effect transistor is connected with diode cathode, load respectively.
The whole elements of circuit are selected army's grade, wherein the preferred THS482 of operational amplifier.
The beneficial effects of the utility model: the utility model is comprised of two PMOS field effect transistor, 1 high temperature operational amplifier, 1 voltage stabilizing didoe and some resistance, electric capacity, comprise operational amplifier power supply circuits, high-order current sampling circuit, constant current value Circuit tuning, power circuit, more than maximum input voltage can reach 100V, constant current value can be pacified with adjusted to 10 at several milliamperes, circuit own loss electric current, when the 36V input voltage less than 1mA.
Description of drawings
Fig. 1 circuit diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, the high-end constant-current source circuit of a kind of high temperature, comprise the operational amplifier power supply circuits, power amplification circuit, constant current value Circuit tuning;
Described operational amplifier power supply circuits comprise power supply E, the first resistance R 1, voltage stabilizing didoe Z, a PMOS field effect transistor Q1 and capacitor C 1; Described power supply E positive pole is connected with voltage stabilizing didoe Z positive pole, capacitor C 1, operational amplifier THS482 respectively, power supply E negative pole is connected with the first resistance R 1, the drain electrode of a PMOS field effect transistor Q1, load RL respectively, the grid of a described PMOS field effect transistor Q1 connects respectively voltage stabilizing didoe Z negative pole and the first resistance R 1, and the source electrode of a described PMOS field effect transistor Q1 connects respectively capacitor C 1, the 3rd resistance R 3, operational amplifier THS482;
Described power amplification circuit comprises operational amplifier THS482, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4; Operational amplifier THS482 in-phase input end connects respectively the 3rd resistance R 3, the second resistance R 2; The second resistance R 2 connects an end of the 4th resistance R 4, and the other end of the 4th resistance R 4 is the source electrode of concatenation operation amplifier THS482 inverting input, the 2nd PMOS field effect transistor Q2 respectively;
Described constant current value Circuit tuning comprises the 2nd PMOS field effect transistor Q2, the 5th resistance R 5, diode D; The grid of the 2nd PMOS field effect transistor Q2 connects respectively the 5th resistance R 5, operational amplifier THS482 output; The source electrode of the 2nd PMOS field effect transistor Q2 also is connected with the 5th resistance R 5, diode D negative pole respectively, and the drain electrode of the 2nd PMOS field effect transistor Q2, load RL anodal with diode D respectively is connected.
The operational amplifier power supply circuits are by voltage stabilizing didoe Z, the first resistance R 1, a PMOS field effect transistor Q
1, capacitor C 1 forms, the supply power voltage value is determined by the voltage stabilizing value of voltage stabilizing didoe Z and the conducting voltage of a PMOS field effect transistor Q1, is about (U
Z-4); The 4th resistance R 4 is the high-side current sample resistance, and the V-of operational amplifier THS482 is E-U
R4The second resistance R 2, the 3rd resistance R 3 form the voltage sample circuit of V+, and the V+ of operational amplifier THS482 is E * (R
3/ R
2+ R
3); The 2nd PMOS field effect transistor Q
2For power device.
Operation principle is as follows: the operational amplifier power supply circuits produce a voltage, are operational amplifier THS482 power supply, and this voltage is also the 2nd PMOS field effect transistor Q
2The maximum drive voltage of grid.When T=0, owing to there is no electric current, U
R4Equal zero, V-equals supply voltage E, and V+ is R
3And R
2To the partial pressure value of E, less than V-, operational amplifier THS482 output low level, the 2nd PMOS field effect transistor Q
2Conducting, starting in load RL has electric current, along with electric current increases, U
R4Increase, when its value equals E * (R
3/ R
2+ R
3) time, the output constant current.When requiring the constant-current source current value to increase, need to increase the voltage stabilizing value of voltage stabilizing didoe Z, thereby increase by the 2nd PMOS field effect transistor Q
2Driving voltage, when needs fine settings constant current value, can realize by the resistance value of adjusting the second resistance R 2.
Although above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (1)
1. the high-end constant-current source circuit of high temperature, is characterized in that, comprises the operational amplifier power supply circuits, power amplification circuit, constant current value Circuit tuning;
Described operational amplifier power supply circuits comprise power supply, the first resistance, voltage stabilizing didoe, PMOS field effect transistor and an electric capacity; Described positive source is connected with voltage stabilizing didoe positive pole, electric capacity, operational amplifier respectively, power cathode is connected with the first resistance, the drain electrode of a PMOS field effect transistor, load respectively, the grid of a described PMOS field effect transistor connects respectively voltage stabilizing didoe negative pole and the first resistance, and the source electrode of a described PMOS field effect transistor connects respectively electric capacity, the 3rd resistance, operational amplifier;
Described power amplification circuit comprises operational amplifier, the second resistance, the 3rd resistance, the 4th resistance; The operational amplifier in-phase input end connects respectively the 3rd resistance, the second resistance; The second resistance connects an end of the 4th resistance, and the other end of the 4th resistance is the source electrode of concatenation operation amplifier inverting input, the 2nd PMOS field effect transistor respectively;
Described constant current value Circuit tuning comprises the 2nd PMOS field effect transistor, the 5th resistance, diode; The grid of the 2nd PMOS field effect transistor connects respectively the 5th resistance, operational amplifier output terminal; The source electrode of the 2nd PMOS field effect transistor also is connected with the 5th resistance, diode cathode respectively, and the drain electrode of the 2nd PMOS field effect transistor is connected with diode cathode, load respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203161379U CN203289321U (en) | 2013-06-04 | 2013-06-04 | High-temperature high-end constant current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203161379U CN203289321U (en) | 2013-06-04 | 2013-06-04 | High-temperature high-end constant current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203289321U true CN203289321U (en) | 2013-11-13 |
Family
ID=49545663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203161379U Expired - Lifetime CN203289321U (en) | 2013-06-04 | 2013-06-04 | High-temperature high-end constant current source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203289321U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603726A (en) * | 2013-12-06 | 2014-02-26 | 沈阳航天新光集团有限公司 | Automatic control system of gas turbine generator set |
| CN104052317A (en) * | 2014-07-03 | 2014-09-17 | 郑州日产汽车有限公司 | Voltage simulator of battery of electric vehicle |
-
2013
- 2013-06-04 CN CN2013203161379U patent/CN203289321U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603726A (en) * | 2013-12-06 | 2014-02-26 | 沈阳航天新光集团有限公司 | Automatic control system of gas turbine generator set |
| CN103603726B (en) * | 2013-12-06 | 2016-01-13 | 沈阳航天新光集团有限公司 | Gas Turbine Generating Units automatic control system |
| CN104052317A (en) * | 2014-07-03 | 2014-09-17 | 郑州日产汽车有限公司 | Voltage simulator of battery of electric vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: High-temperature high-end constant current source circuit Effective date of registration: 20181129 Granted publication date: 20131113 Pledgee: Qilu bank Limited by Share Ltd. Ji'nan Jigang branch Pledgor: JINAN NEW GIGANANO LONG-DISTANCE MEASURING & CONTROL Co.,Ltd. Registration number: 2018370000209 |
|
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 250101 Shandong city of Ji'nan province high tech Zone Shun Road No. 2000 Shun Tai Plaza 8 Building 8 floor Patentee after: JINAN NEW GIGANANO LONG-DISTANCE MEASURING & CONTROL Co.,Ltd. Address before: 250101 Shandong city of Ji'nan province high tech Zone Shun Road No. 2000 Shun Tai Plaza Building 8, room 1-805 Patentee before: JINAN NEW GIGANANO LONG-DISTANCE MEASURING & CONTROL Co.,Ltd. |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220302 Granted publication date: 20131113 Pledgee: Qilu bank Limited by Share Ltd. Ji'nan Jigang branch Pledgor: JINAN NEW GIGANANO LONG-DISTANCE MEASURING & CONTROL Co.,Ltd. Registration number: 2018370000209 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131113 |