CN104750158A - High accuracy constant current source with open circuit protection function - Google Patents
High accuracy constant current source with open circuit protection function Download PDFInfo
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- CN104750158A CN104750158A CN201310738639.5A CN201310738639A CN104750158A CN 104750158 A CN104750158 A CN 104750158A CN 201310738639 A CN201310738639 A CN 201310738639A CN 104750158 A CN104750158 A CN 104750158A
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- current source
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- open circuit
- constant current
- circuit protection
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Abstract
The invention relates to a high accuracy constant current source with an open circuit protection function. The high accuracy constant current source with the open circuit protection function is composed of a reference voltage source, an operational amplifier, an output composite tube and an open circuit protection circuit, wherein an output end of the reference voltage source is connected with an input end of the open circuit protection circuit sequentially through the operational amplifier and the output composite tube, the open circuit protection circuit comprises two diodes connected with the output composite tube, an output end of one of the two diodes is added on a measured resistor so as to form a load measurement circuit, and an output end of the other diode is connected with a device zero line through a voltage stabilization tube so as to form open circuit protection. The high accuracy constant current source with the open circuit protection function uses the reference source with a heating constant temperature function and the operational amplifier high in input impedance and low in drift, uses the composite tube composed of a field effect tube and a triode for an outlet stage, has a high amplification factor and a low temperature coefficient, and guarantees high accuracy and stability of constant current output. The open circuit protection circuit is added on the high accuracy constant current source with the open circuit protection function, and when a load is removed from the constant current source, a dummy load can be seamlessly connected into the high accuracy constant current source with the open circuit protection function, and therefore reliability of the circuit of the high accuracy constant current source with the open circuit protection function is improved.
Description
Technical field
The invention belongs to technical field of circuit design, relate to a kind of element circuit in Analogous Integrated Electronic Circuits, particularly a kind of high precision (precision is better than 0.01%) constant current source with open-circuit-protection.
Background technology
Existing constant current source has two kinds, a kind of be the high-precision source table of import as the B2911A of Agilent, 6166 of Advantest etc., the another kind constant-current source circuit that to be user be built into various discrete or integrated chip.Although the high-precision source table precision of import is better than 0.01%, degree of stability is also very high, and price is all very expensive, and volume is comparatively large, is not easy to be integrated into embedded control system; The precision of the constant-current source circuit that user is built into various discrete or integrated chip, degree of stability can only meet general operational requirement, do not possess promotional value; And these two kinds of circuit are when accessing automatic measuring circuit, all need additional open loop protection circuit again.
Summary of the invention
The object of the invention is to solve prior art Problems existing, provide that a kind of structure is simple, volume is little, precision and degree of stability is high, cost is low, functional reliability is good, be suitable for the high precise current source of the band open-circuit-protection applied.
For achieving the above object and adopt technical solution be such: the high precise current source of the band open-circuit-protection provided is by reference voltage source, operational amplifier, export complex pipe and open loop protection circuit composition, the output terminal of reference voltage source is successively through operational amplifier, the input end of open loop protection circuit is connected to after exporting complex pipe, open loop protection circuit comprises two diodes connected with output complex pipe output terminal, wherein first diode exports to be added in measured resistance and forms load sense circuitry, the output of second diode is connected to equipment zero line through a stabilivolt, form open-circuit-protection.Owing to being provided with the open loop protection circuit be made up of second diode and stabilivolt in constant current source, by the reasonable setting of voltage stabilizing diode voltage stabilizing value, guarantee that the maximum pressure drop produced in load when testing is less than the voltage stabilizing value of voltage stabilizing diode.Like this, when there being load, due to voltage buffer action, constant current can only by first diode to this loop flow of load; And when load open circuit, the just seamless loop flow passing through second diode and stabilivolt, ensure that the stable and reliable of constant current source.
In the high precise current source of above-mentioned band open-circuit-protection, reference voltage source adopts model to be the device of LM199AH.
In the high precise current source of above-mentioned band open-circuit-protection, operational amplifier adopts model to be the operational amplifier of 0P07 or 0P77.
In the high precise current source of above-mentioned band open-circuit-protection; exporting complex pipe is the constant current source output-stage circuit be made up of field effect transistor and two-stage triode; wherein field effect transistor adopts P-channel field-effect transistor (PEFT) pipe, and PNP type triode selected by first order triode, and NPN type triode selected by second level triode.
In the high precise current source of above-mentioned band open-circuit-protection, field effect transistor adopts P channel depletion type field effect transistor BS250, and triode 9015 selected by first order triode, and triode 9013 selected by second level triode.
Compared with prior art, structure of the present invention is simple, volume is little, easy to operate, result of use good, this constant current source have employed the operational amplifier of reference source with heated constant temperature function and high input impedance low drifting, output stage adopts the complex pipe of P-channel field-effect transistor (PEFT) pipe and triode composition, there is very high enlargement factor and lower temperature coefficient, ensure that high precision (precision is better than 0.01%) and the degree of stability of constant current output; This constant current source also add open loop protection circuit simultaneously, and when constant current source is withdrawn in load, the fictitious load of energy seamless access, improves the reliability of constant-current source circuit, therefore have good promotional value.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the present invention's specific embodiment.
Embodiment
See accompanying drawing; the high precise current source of band open-circuit-protection of the present invention is made up of reference voltage source A101, operational amplifier A 102, output complex pipe and open loop protection circuit, and the output terminal of reference voltage source A101 is connected to the input end of open loop protection circuit successively after operational amplifier A 102, output complex pipe.
Reference voltage source A101 adopts the stabilivolt of the output that can suspend, band thermostat, and device model is LM199AH, and this circuit provides the reference voltage source Vref of high precision, high stable, and its temperature coefficient is 0.0001%, and long-time stability are 20ppm.
Operational amplifier A 102 and peripheral circuit form a negative voltage feedback, can be obtained by " empty short " of negative feedback amplifier:
UAB＝Uref。
In concrete structure, operational amplifier A 102 can select the operational amplifier of 0P07 or 0P77 of low drifting.
Exporting complex pipe is the constant current source output-stage circuit be made up of field effect transistor Q1 and two-stage triode V101 and V102.Because field effect transistor is voltage control device, grid not obtaining current (i.e. Ig ≈ 0) and the base stage of triode gets certain electric current always substantially, again because field effect transistor is many electronic conductions, and triode is then both utilized many sons to utilize few son, and the concentration of few son is subject to the impact of the external condition such as temperature, radiation, therefore field effect transistor Q1 adopts P-channel field-effect transistor (PEFT) pipe, and first order triode V101 selects PNP type triode, and second level triode V102 selects NPN type triode.In concrete structure, field effect transistor Q1 can select P channel depletion type field effect transistor BS250, and first order triode V101 can select triode 9015 (PNP), and second level triode V101 can select triode 9013 (NPN).
Output constant current Iout is calculated by formula Iout=UAB/R103.
Open loop protection circuit comprises two diode V103 and V104 connected with output complex pipe output terminal; wherein first diode V103 exports to be added in measured resistance and forms load sense circuitry; the output of second diode V104 is connected to equipment zero line through a stabilivolt V105, forms open-circuit-protection.In practical application, by the reasonable setting to voltage stabilizing diode voltage stabilizing value, guarantee that the maximum pressure drop produced in load when testing is less than the voltage stabilizing value of stabilivolt V105.Like this, when loaded, due to voltage buffer action, constant current can only pass through this loop flow of Ia, and when load open circuit, just seamless by Ib loop flow, ensure that the stable and reliable of constant current source.
Claims (5)
1. the high precise current source with open-circuit-protection, it is characterized in that: by reference voltage source, operational amplifier, export complex pipe and open loop protection circuit composition, the output terminal of reference voltage source is successively through operational amplifier, the input end of open loop protection circuit is connected to after exporting complex pipe, open loop protection circuit comprises two diode (V103 connected with output complex pipe output terminal, V104), wherein first diode (V103) output is added in measured resistance and forms load sense circuitry, the output of second diode (V104) is connected to equipment zero line through a stabilivolt (V105), form open-circuit-protection.
2. the high precise current source of band open-circuit-protection according to claim 1, is characterized in that: described reference voltage source adopts model to be the device of LM199AH.
3. the high precise current source of band open-circuit-protection according to claim 1, is characterized in that: described operational amplifier adopts model to be the operational amplifier of 0P07 or 0P77.
4. the high precise current source of band open-circuit-protection according to claim 1; it is characterized in that: described output complex pipe is the constant current source output-stage circuit be made up of field effect transistor (Q1) and two-stage triode (V101, V102); wherein field effect transistor (Q1) adopts P-channel field-effect transistor (PEFT) pipe; PNP type triode selected by first order triode (V101), and NPN type triode selected by second level triode (V102).
5. the high precise current source of band open-circuit-protection according to claim 4; it is characterized in that: field effect transistor (Q1) adopts P channel depletion type field effect transistor BS250; triode 9015 selected by first order triode (V101), and triode 9013 selected by second level triode (V102).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738639.5A CN104750158A (en) | 2013-12-25 | 2013-12-25 | High accuracy constant current source with open circuit protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738639.5A CN104750158A (en) | 2013-12-25 | 2013-12-25 | High accuracy constant current source with open circuit protection function |
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| Publication Number | Publication Date |
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| CN104750158A true CN104750158A (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310738639.5A Pending CN104750158A (en) | 2013-12-25 | 2013-12-25 | High accuracy constant current source with open circuit protection function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291010A (en) * | 2016-08-11 | 2017-01-04 | 河北白晶环境科技有限公司 | Multipath controllable constant current source in high precision |
| CN106571810A (en) * | 2016-10-21 | 2017-04-19 | 北京无线电计量测试研究所 | Atomic frequency standard equipment temperature coefficient compensation device and method |
| CN109341722A (en) * | 2018-11-21 | 2019-02-15 | 中国船舶重工集团公司第七0七研究所 | A kind of multi-path constant-current source that the calibration of high-precision IF conversion module is used |
| CN111736651A (en) * | 2020-05-26 | 2020-10-02 | 中国电子科技集团公司第四十三研究所 | Temperature compensation constant current source circuit and temperature compensation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2164569Y (en) * | 1993-08-29 | 1994-05-11 | 王恒山 | Energy-saving dc voltage stabilizing power |
| JPH09120317A (en) * | 1995-10-24 | 1997-05-06 | Advantest Corp | High-precision constant current source circuit |
| US20070159750A1 (en) * | 2006-01-09 | 2007-07-12 | Powerdsine, Ltd. | Fault Detection Mechanism for LED Backlighting |
| CN202586331U (en) * | 2012-06-09 | 2012-12-05 | 西南交通大学 | Constant current source protection circuit |
| CN203673383U (en) * | 2013-12-25 | 2014-06-25 | 西安航天远征流体控制股份有限公司 | High-precision constant current source with open circuit protection |
-
2013
- 2013-12-25 CN CN201310738639.5A patent/CN104750158A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2164569Y (en) * | 1993-08-29 | 1994-05-11 | 王恒山 | Energy-saving dc voltage stabilizing power |
| JPH09120317A (en) * | 1995-10-24 | 1997-05-06 | Advantest Corp | High-precision constant current source circuit |
| US20070159750A1 (en) * | 2006-01-09 | 2007-07-12 | Powerdsine, Ltd. | Fault Detection Mechanism for LED Backlighting |
| CN202586331U (en) * | 2012-06-09 | 2012-12-05 | 西南交通大学 | Constant current source protection circuit |
| CN203673383U (en) * | 2013-12-25 | 2014-06-25 | 西安航天远征流体控制股份有限公司 | High-precision constant current source with open circuit protection |
Non-Patent Citations (2)
| Title |
|---|
| 杨霖: "LMLM199/299/399精密电压基准", 《电子制作》 * |
| 梁志星: "谈谈复合管", 《家电检修技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291010A (en) * | 2016-08-11 | 2017-01-04 | 河北白晶环境科技有限公司 | Multipath controllable constant current source in high precision |
| CN106571810A (en) * | 2016-10-21 | 2017-04-19 | 北京无线电计量测试研究所 | Atomic frequency standard equipment temperature coefficient compensation device and method |
| CN106571810B (en) * | 2016-10-21 | 2020-02-07 | 北京无线电计量测试研究所 | Temperature coefficient compensation device and method for atomic frequency standard equipment |
| CN109341722A (en) * | 2018-11-21 | 2019-02-15 | 中国船舶重工集团公司第七0七研究所 | A kind of multi-path constant-current source that the calibration of high-precision IF conversion module is used |
| CN111736651A (en) * | 2020-05-26 | 2020-10-02 | 中国电子科技集团公司第四十三研究所 | Temperature compensation constant current source circuit and temperature compensation method |
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Application publication date: 20150701 |