CN105375892A - High-efficiency energy-saving current amplifier - Google Patents
High-efficiency energy-saving current amplifier Download PDFInfo
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- CN105375892A CN105375892A CN201410437959.1A CN201410437959A CN105375892A CN 105375892 A CN105375892 A CN 105375892A CN 201410437959 A CN201410437959 A CN 201410437959A CN 105375892 A CN105375892 A CN 105375892A
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- current amplifier
- nmos tube
- current
- amplifier
- ohm
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Abstract
The invention provides a high-efficiency energy-saving current amplifier, belongs to the field of relay protection test apparatuses, and in particular relates to a relay protection tester. A drain D of an NMOS tube, which is taken as an input end, is connected with an output end of a current amplifier equivalent module; a source of the NMOS tube, which is taken as an output end, is connected with a load; a grid of the NMOS tube is connected with a logic control loop; the value of a sampling resistor R15 is reduced from 0.1 ohm to 0.02 ohm; an added sampling resistor R16 with the value of 0.3 ohm is added between the drain D and the source S; on and off of the NMOS tube are controlled through the voltage size of the grid; when output current of the current amplifier is larger than or equal to 15 A, the voltage of the grid is up to a threshold; when the NMOS tube is in an on state, current flows through a branch of the NMOS tube; when the output current of the current amplifier is smaller than 15 A, the voltage of the grid is not up to the threshold, the NMOS tube is in an off state, and the current flows through a branch of the added sampling resistor. According to the high-efficiency energy-saving current amplifier, which is provided by the invention, when the voltage of the grid is up to the threshold, the NMOS tube has the capability of forming a conducting channel between the source and the drain; therefore, the power loss of the relay protection tester current amplifier is reduced, the sampling precision is improved, the investment is reduced, the maximum output current is increased and the like.
Description
Technical field
The invention belongs to relay protection test apparatus field, particularly a kind of relay-protection tester device.
Background technology
In relay protection test field, relay-protection tester is the most general measuring instrument.Issuing on the basis of " microcomputer type relay protection experimental rig technical conditions (exposure draft) " with reference to Electricity Department; extensively listen to consumers' opinions; sum up current domestic like product pluses and minuses, fully use a kind of relay-protection tester device that modern advanced microelectric technique and device realize.The analog voltage exported in relay-protection tester has to pass through after amplifier carries out power amplification and just can deliver on the input terminal of measured relay.Power amplifier is divided into again voltage amplifier and current amplifier, and it is as the pith of experimental provision, and performance index are directly connected to the accuracy of test.But traditional current-amplifying appliance has following shortcoming: (1) sampling precision is low; (2) power loss is large; (3) maximum output current is little.
Summary of the invention
The invention provides energy-efficient current amplifier, can solve traditional current amplifier sampling precision low, power loss is large, the problem that maximum output current is little.
The technical solution used in the present invention is:
Add NMOS tube switching branches at amplifier out, NMOS tube drain D is connected with current amplifier equivalent modules output as input, and NMOS tube source S is connected with load as output, and grid andlogic control loop is connected; Sampling resistor R15 value is reduced to 0.02 ohm by 0.1 ohm; The newly-increased sampling resistor R16 of value 0.3 ohm is added between drain D and source S.
Control NMOS tube by grid voltage size to cut-off, 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 does not reach threshold value, and NMOS tube is in off-state, and electric current flows through from newly-increased sampling resistor R16 branch road.
Metal-oxide-semiconductor type is N channel enhancement insulated-gate type metal-oxide-semiconductor.
Sampling resistor R15 changes into 0.03 ohm by 0.1 ohm.
Newly-increased sampling resistor R16 value is 0.3 ohm.
When output current is less than 15 ampere-hours, current amplifier power loss is: P=I
o* I
o* (R16+R15); When output current is more than or equal to 15 ampere-hours, current amplifier power loss is: P=I
o* I
o* R15.
When output current is less than 15 ampere-hours, sampled voltage is V
o=I
o* (R15+R16); When output current is more than or equal to 15 ampere-hours, sampled voltage is V
o=I
o* R15.When the condition of amplifier other influences precision does not change, improve sampled voltage and namely improve sampling precision.
Beneficial effect of the present invention is: the present invention adopts NMOS tube drain D to be connected with current amplifier equivalent modules output as input, NMOS tube source electrode is connected with load as output, grid andlogic control loop is connected, sampling resistor R15 value reduces to 0.02 ohm by 0.1 ohm, adds the method for the newly-increased sampling resistor R16 of value 0.3 ohm between drain D and source S; Improve the sampling precision of current amplifier, reduce the power loss of current amplifier, improve the maximum output current of current amplifier.
The components and parts that the present invention adopts all can have been bought in market, there is not special formulation situation, cost-saving, are convenient to batch production.
Accompanying drawing explanation
Fig. 1 is relay-protection tester current amplifier of the present invention equivalence block diagram.
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, illustrate that the present invention will be further described with embodiment below in conjunction with accompanying drawing.
With reference to shown in Fig. 1, Fig. 2, this energy-efficient current amplifier is applied in relay-protection tester, is made up of input stage, promotion level, output stage.Input stage is made up of LF356 operational amplifier, and promote level and be made up of triode T1 and T3, output stage is made up of complementary darlington circuit.When the very positive half cycle of the current collection of T3, triode T4 and T5 conducting.When T3 current collection very negative half period time, triode T6 and T7 conducting.Transistor T3 promotes transistor T4 and T6, then promotes transistor T5 and T7 respectively by transistor T4 and T6.
The electric current exported as T5 and T7 is more than or equal to 15 amperes, and grid voltage reaches threshold value, and NMOS tube is in closure state, and electric current flows through from NMOS tube branch road, and current amplifier power loss is: P=I
o* I
o* R15, sampled voltage is V
o=I
o* R15; When T5 and T7 output current is less than 15 ampere-hours, grid voltage does not reach threshold value, and NMOS tube is in off-state, and electric current flows through from newly-increased sampling resistor R4 branch road, and current amplifier power loss is: P=I
o* I
o* (R16+R15), sampled voltage is V
o=I
o* (R15+R16).
In current amplifier, three bias diodes D1, D2, D3 to play to output stage with weak forward biased effect, enable output stage be in class AB operating state.Transistor T1 improves promotion ability, for transistor T3 provides power output.Transistor T2 and resistance R6, R7, R8 constitute constant-current source circuit, stablize bias current.R15, R16 and R2 constitute parallel-current negative feedback loop.R15 is sampling resistor, and R16 is newly-increased sampling resistor.Regulate R2 can change the gain of current amplifier.
In this device, adopt negative feedback loop, add NMOS tube switch control rule, increase new sampling resistor, and change former sampling resistor resistance.Thus make current amplifier have stronger stability, reduce the power loss of current amplifier, improve the sampling precision of current amplifier, improve the maximum output current of current amplifier.
Claims (7)
1. an energy-efficient current amplifier, be applied to relay-protection tester, it is characterized in that, NMOS tube switching branches is added at amplifier out, NMOS tube drain D is connected with current amplifier equivalent modules output as input, NMOS tube source S is connected with load as output, and grid andlogic control loop is connected; Sampling resistor value R15 is reduced to 0.02 ohm by 0.1 ohm; The newly-increased sampling resistor R16 of value 0.3 ohm is added between drain D and source S.
2. the energy-efficient current amplifier of one according to claim 1, it is characterized in that, control NMOS tube by grid voltage size to cut-off, when current amplifier output current is more than or equal to 15 ampere-hours, grid voltage reaches threshold value, 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 does not reach threshold value, and NMOS tube is in off-state, and electric current flows through from newly-increased sampling resistor R16 branch road.
3. the energy-efficient current amplifier of one according to claim 1, is characterized in that, described metal-oxide-semiconductor type is N channel enhancement insulated-gate type metal-oxide-semiconductor.
4. the energy-efficient current amplifier of one according to claim 1, is characterized in that, described sampling resistor R15 changes into 0.03 ohm by 0.1 ohm.
5. the energy-efficient current amplifier of one according to claim 1, is characterized in that, described newly-increased sampling resistor R16 value is 0.3 ohm.
6. the energy-efficient current amplifier of one according to claim 1, is characterized in that, described output current of working as is less than 15 ampere-hours, and current amplifier power loss is: P=Io
2* (R15+R16); When output current is more than or equal to 15 ampere-hours, current amplifier power loss is: P=Io
2* R15.
7. the energy-efficient current amplifier of one according to claim 1, is characterized in that, described output current of working as is less than 15 ampere-hours, and sampled voltage is Vo=Io*(R15+R16); When output current is more than or equal to 15 ampere-hours, sampled voltage is Vo=Io*R15, when the condition of amplifier other influences precision does not change, improves sampled voltage and namely improves 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 true CN105375892A (en) | 2016-03-02 |
| CN105375892B CN105375892B (en) | 2018-01-16 |
Family
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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105375892B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110763934A (en) * | 2019-10-14 | 2020-02-07 | 许继电气股份有限公司 | Relay protection testing arrangement |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030016082A1 (en) * | 2001-07-23 | 2003-01-23 | Yoshikuni Matsunaga | High frequency power amplifier circuit device |
| 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 |
-
2014
- 2014-08-29 CN CN201410437959.1A patent/CN105375892B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030016082A1 (en) * | 2001-07-23 | 2003-01-23 | Yoshikuni Matsunaga | High frequency power amplifier circuit device |
| 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 |
|---|
| 李辰等: "继电保护测试仪用大电流功率放大电路的研究", 《电力***保护与控制》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763934A (en) * | 2019-10-14 | 2020-02-07 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105375892B (en) | 2018-01-16 |
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Granted publication date: 20180116 Termination date: 20180829 |