CN105375892B - A kind of energy-efficient current amplifier - Google Patents
A kind of energy-efficient current amplifier Download PDFInfo
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- CN105375892B CN105375892B CN201410437959.1A CN201410437959A CN105375892B CN 105375892 B CN105375892 B CN 105375892B CN 201410437959 A CN201410437959 A CN 201410437959A CN 105375892 B CN105375892 B CN 105375892B
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- current
- nmos tube
- current amplifier
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- amplifier
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Abstract
A kind of energy-efficient current amplifier of the present invention, belongs to relay protection test apparatus field, more particularly to a kind of relay-protection tester device.NMOS tube drain D is connected as input with current amplifier equivalent modules output end, and NMOS tube source electrode is connected as output end with load, and grid is connected with loop control logic；Sampling resistor R15 values are reduced to 0.02 ohm by 0.1 ohm；0.3 ohm of newly-increased sampling resistor R16 of value is added between drain D and source S；NMOS tube is controlled to cut-off by grid voltage size, when current amplifier output current is more than or equal to 15 ampere-hours, grid voltage reaches threshold value, and NMOS tube is in closure state, and electric current flows through from NMOS tube branch road；When current amplifier output current is less than 15 ampere-hours, grid voltage is not up to threshold value, and NMOS tube is off, and electric current flows through from newly-increased sampling resistor branch.The present invention using NMOS tube grid voltage reach threshold value have make source electrode and drain electrode between formed conducting channel ability, realize relay-protection tester current amplifier reduce power attenuation, improve sampling precision, reduce investment, improve maximum output current the advantages that.
Description
Technical field
The invention belongs to relay protection test apparatus field, more particularly to a kind of relay-protection tester device.
Background technology
In relay protection test field, relay-protection tester is most common measuring instrument.It is with reference to Electricity Department
Issue《Microcomputer type relay protection experimental rig technical conditions（Exposure draft）》On the basis of, consumers' opinions is listened to extensively, is summarized
Current domestic like product advantage and disadvantage, a kind of relay protection fully realized using modern advanced microelectric technique and device are surveyed
Test instrument.The analog voltage exported in relay-protection tester have to pass through amplifier carry out power amplification after can just deliver to it is tested
On the input terminal of relay.Power amplifier is divided into voltage amplifier and current amplifier again, its weight as experimental provision
Part is wanted, performance indications are directly connected to the accuracy of experiment.But traditional current amplifier has as a drawback that：（1）Adopt
Sample precision is low；（2）Power attenuation is big；（3）Maximum output current is small.
The content of the invention
The invention provides energy-efficient current amplifier, it is low to solve traditional current amplifier sampling precision, work(
The problem of rate loss is big, and maximum output current is small.
The technical solution adopted by the present invention is：
NMOS tube switching branches are added in amplifier out, NMOS tube drain D is as input and current amplifier etc.
Effect module output end is connected, and NMOS tube source S is connected as output end with load, and grid is connected with loop control logic；It will adopt
Sample resistance R15 values are reduced to 0.02 ohm by 0.1 ohm；The newly-increased of 0.3 ohm of value is added between drain D and source S to adopt
Sample resistance R16.
NMOS tube is controlled to cut-off by grid voltage size, when current amplifier output current is more than or equal to 15 ampere-hours,
Grid voltage reaches threshold value, and NMOS tube is in closure state, and electric current flows through from NMOS tube branch road；When current amplifier output current
Less than 15 ampere-hours, grid voltage is not up to threshold value, and NMOS tube is off, and electric current is from newly-increased sampling resistor R16 branch roads
Flow through.
NMOS tube type is N-channel reinforced insulation grid-type metal-oxide-semiconductor.
Sampling resistor R15 changes into 0.02 ohm by 0.1 ohm.
Newly-increased sampling resistor R16 values are 0.3 ohm.
When output current is less than 15 ampere-hours, current amplifier power attenuation is：P=Io 2*（R16+R15）；Work as output current
More than or equal to 15 ampere-hours, current amplifier power attenuation is：P=Io 2* R15。IoFor current amplifier output current.
When output current is less than 15 ampere-hours, sampled voltage Vo= Io*（R16+R15）；When output current is more than or equal to
15 ampere-hours, sampled voltage Vo=Io*R15.When the condition of amplifier other influences precision does not change, sampling electricity is improved
Pressure improves sampling precision.
Beneficial effects of the present invention are：The present invention is using NMOS tube drain D as input and the equivalent mould of current amplifier
Block output end is connected, and NMOS tube source electrode is connected as output end with load, and grid is connected with loop control logic, sampling resistor
R15 values are reduced to 0.02 ohm by 0.1 ohm, and the newly-increased sampling resistor of 0.3 ohm of value is added between drain D and source S
R16 method；The sampling precision of current amplifier is improved, reduces the power attenuation of current amplifier, electric current is improved and puts
The maximum output current of big device.
The component that the present invention uses can be commercially available, cost-effective in the absence of special formulation situation, be easy to batch
Production.
Brief description of the drawings
Fig. 1 is relay-protection tester current amplifier equivalent block diagram of the present invention.
Fig. 2 is relay-protection tester current amplifier schematic diagram of the present invention.
Embodiment
The invention provides a kind of energy-efficient current amplifier, and explanation and embodiment are to this below in conjunction with the accompanying drawings
Invention is described further.
Shown in reference picture 1, Fig. 2, this energy-efficient current amplifier is applied in relay-protection tester, by inputting
Level, level, output stage is promoted to form.Input stage is made up of LF356 operational amplifiers, promotes level to be made up of triode T1 and T3, defeated
Go out level to be made up of complementary darlington circuit.When T3 current collection extremely positive half cycle, triode T4 turns on T5.When T3 colelctor electrode
For negative half period when, triode T6 turns on T7.Triode T3 promotes triode T4 and T6, then is promoted respectively by triode T4 and T6
Triode T5 and T7.
When the electric current of T5 and T7 outputs is more than or equal to 15 amperes, grid voltage reaches threshold value, and NMOS tube is in closure state,
Electric current flows through from NMOS tube branch road, and current amplifier power attenuation is P=Io 2* R15, sampled voltage Vo=Io*R15；When T5 with
T7 output currents are less than 15 ampere-hours, and grid voltage is not up to threshold value, and NMOS tube is off, and electric current is electric from newly-increased sampling
Resistance R16 branch roads flow through, and current amplifier power attenuation is P=Io 2*（R16+R15）, sampled voltage Vo= Io*（R16+R15）.
Three biasings diode D1, D2, D3 play a part of with weak forward bias making to output stage in current amplifier
Output stage is at class AB working condition.Triode T1 improves promotion ability, and power output is provided for triode T3.Three poles
Pipe T2 and resistance R6, R7, R8 constitute constant-current source circuit, stabilize bias current.R15, R16 and R2 constitute parallel-current and born
Backfeed loop.R15 is sampling resistor, and R16 is newly-increased sampling resistor.Regulation R2 can change the gain of current amplifier.
In the present apparatus, using negative feedback loop, NMOS tube switch control is added, increases new sampling resistor, and change original
Sampling resistor resistance.So that current amplifier has stronger stability, the power attenuation of current amplifier is reduced, is improved
The sampling precision of current amplifier, improve the maximum output current of current amplifier.
Claims (4)
- A kind of 1. energy-efficient current amplifier, applied to relay-protection tester, it is characterised in that this energy-efficient electric current Amplifier is applied in relay-protection tester, by input stage, promotes level, output stage to form, input stage is by LF356 operation amplifiers Device is formed, and promotes level to be made up of triode T1 and T3, and output stage is made up of complementary darlington circuit, when T3 current collection extremely just half Zhou Shi, triode T4 turn on T5, and when T3 current collection extremely negative half period, triode T6 turns on T7, three biasing diodes D1, D2, D3 play a part of making output stage be at class AB working condition, three poles with weak forward bias to output stage Pipe T1 improves promotion ability, provides power output for triode T3, triode T2 constitutes constant-current source electricity with resistance R6, R7, R8 Road, bias current is stabilized, R15, R16 and R2 constitute parallel-current negative feedback loop, and NMOS is added in amplifier out Pipe switching branches, NMOS tube drain D are connected as input with current amplifier equivalent modules output end, and NMOS tube source S is made It is connected for output end with load, grid is connected with loop control logic, and sampling resistor value R15 is reduced into 0.02 by 0.1 ohm Ohm, the newly-increased sampling resistor R16 of 0.3 ohm of value is added between drain D and source S, is controlled by grid voltage size NMOS tube is cut-off, and when current amplifier output current is more than or equal to 15 ampere-hours, grid voltage reaches threshold value, and NMOS tube is in and closed Conjunction state, electric current flow through from NMOS tube branch road, and when current amplifier output current is less than 15 ampere-hours, grid voltage is not up to threshold Value, NMOS tube are off, and electric current flows through from newly-increased sampling resistor R16 branch roads.
- 2. a kind of energy-efficient current amplifier according to claim 1, it is characterised in that the NMOS tube type is N-channel reinforced insulation grid-type metal-oxide-semiconductor.
- 3. a kind of energy-efficient current amplifier according to claim 1, it is characterised in that as the output current IoIt is small In 15 ampere-hours, current amplifier power attenuation is：P=Io 2*（R15+R16）, when output current is more than or equal to 15 ampere-hours, electricity Stream amplifier power attenuation is：P=Io 2* R15, IoFor current amplifier output current.
- 4. a kind of energy-efficient current amplifier according to claim 1, it is characterised in that as the output current IoIt is small In 15 ampere-hours, sampled voltage Vo=Io *（R15+R16）, when output current is more than or equal to 15 ampere-hours, sampled voltage Vo= Io * R15, when the condition of amplifier other influences precision does not change, improve sampled voltage and improve sampling precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410437959.1A CN105375892B (en) | 2014-08-29 | 2014-08-29 | A kind of energy-efficient current amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410437959.1A CN105375892B (en) | 2014-08-29 | 2014-08-29 | A kind of energy-efficient current amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105375892A CN105375892A (en) | 2016-03-02 |
| CN105375892B true CN105375892B (en) | 2018-01-16 |
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ID=55377752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410437959.1A Expired - Fee Related CN105375892B (en) | 2014-08-29 | 2014-08-29 | A kind of energy-efficient current amplifier |
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| Country | Link |
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| CN (1) | CN105375892B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763934B (en) * | 2019-10-14 | 2022-11-15 | 许继电气股份有限公司 | Relay protection testing arrangement |
| CN110650574A (en) * | 2019-10-21 | 2020-01-03 | 深圳市富满电子集团股份有限公司 | LED short-circuit detection circuit, driving chip and driving method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201327524Y (en) * | 2008-11-20 | 2009-10-14 | 西安佰人科技有限公司 | High-voltage heavy-current amplifier circuit |
| CN101924520A (en) * | 2009-06-17 | 2010-12-22 | 中兴通讯股份有限公司 | Base station power amplifier and method for enhancing efficiency of base station power amplifier |
| CN202435345U (en) * | 2011-10-27 | 2012-09-12 | 苏州井利电子有限公司 | Energy-saving high-efficiency audio power amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003037454A (en) * | 2001-07-23 | 2003-02-07 | Hitachi Ltd | High-frequency power amplifier circuit |
-
2014
- 2014-08-29 CN CN201410437959.1A patent/CN105375892B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201327524Y (en) * | 2008-11-20 | 2009-10-14 | 西安佰人科技有限公司 | High-voltage heavy-current amplifier circuit |
| CN101924520A (en) * | 2009-06-17 | 2010-12-22 | 中兴通讯股份有限公司 | Base station power amplifier and method for enhancing efficiency of base station power amplifier |
| CN202435345U (en) * | 2011-10-27 | 2012-09-12 | 苏州井利电子有限公司 | Energy-saving high-efficiency audio power amplifier |
Non-Patent Citations (1)
| Title |
|---|
| 继电保护测试仪用大电流功率放大电路的研究;李辰等;《电力***保护与控制》;20130416;第41卷(第8期);第129-134页 * |
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| Publication number | Publication date |
|---|---|
| CN105375892A (en) | 2016-03-02 |
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