CN105278599B - Voltage-controlled current source circuit using CT to replace current sensing resistor - Google Patents
Voltage-controlled current source circuit using CT to replace current sensing resistor Download PDFInfo
- Publication number
- CN105278599B CN105278599B CN201510690911.6A CN201510690911A CN105278599B CN 105278599 B CN105278599 B CN 105278599B CN 201510690911 A CN201510690911 A CN 201510690911A CN 105278599 B CN105278599 B CN 105278599B
- Authority
- CN
- China
- Prior art keywords
- voltage
- resistance
- operational amplifier
- current source
- source circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012546 transfer Methods 0.000 claims abstract description 43
- 238000005070 sampling Methods 0.000 claims abstract description 36
- 230000005611 electricity Effects 0.000 claims description 11
- 230000006872 improvement Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The invention discloses a voltage-controlled current source circuit using a CT to replace a current sensing resistor. Floating load and grounded load voltage-controlled current source circuit topologies are improved based on large current output, a sampling precision CT is introduced to replace the traditional current sensing resistor, the primary side of the CT is directly connected in series to the output loop of a power operational amplifier, and the secondary side is connected with a transfer resistor to feed back voltage signals. Thus, the limit put on the current output capacity of the circuit by the floating load and grounded load voltage-controlled current source circuits due to the current sensing resistor is eliminated, the situation in which power consumption is caused when the current flows through the current sensing resistor is avoided, and the efficiency of the voltage-controlled current source is greatly increased.
Description
Technical field
The invention belongs to high-power electric and electronic circuit design field, in particular, it is related to a kind of new piezoelectric voltage control
Current source (VCCS) circuit processed, mainly completes voltage to the conversion of electric current, realizes the function of piezoelectric voltage control electric current source circuit.
Background technology
Voltage control type current source (abbreviation VCCS) is widely used in high power semi-conductor component testing, motor torque controls
With fields such as power measurements.VCCS is used for the characteristic test of high power semi-conductor components and parts, the main effect playing driving source；
VCCS is used for motor torque control and is because that torque and current of electric assume functional relationship and relatively simple, employing in servo loop
Current driver mode can reduce the delayed phase being led to by motor inductance and improve the stability in loop；And VCCS is used for electricity
Power measurement is mainly used in comparison expression current measurement system, and VCCS provides the benchmark being compared with tested electric current or standard
Amount.
In the application scenario of small-power VCCS, operational amplifier and mu balanced circuit device is generally utilized to realize, circuit connects
Become close-loop control mode, measuring accuracy is higher.
In the occasion needing relatively high power current source, commonly used field effect transistor, Darlington transistor constant power device are realized
Voltage is to the conversion of electric current, and adopts open loop control mode more, and measuring accuracy is relatively low.
Float duty tradition VCCS circuit is as shown in figure 1, feedback branch introduces to input from amplifier out
Negative feedback, wherein VIN are input voltage, and RS is current sensing resistor, and RF, Rd and Cf are respectively the electricity on two negative feedback branch roads
Resistance and electric capacity, resistance RB is to prevent in-phase input signals for 1 from disconnecting in input voltage source or proceeding to high resistant in the middle of power cycles
Float during state.Amplifier circuit gain is equal to, by forcing RS both end voltage to reach one, the electricity being applied to in-phase input end
Pressure numerical value, generates the transmission function of following output current and input voltage：
The Voltage-controlled Current Source for ground connection load realized by operational amplifier is as shown in Fig. 2 in fact it is one
Plant different types of amplifier, input signal and feedback signal can be sensed in differential pressure mode, wherein VIN is input voltage, R1
For input resistance, two RF resistance complete the positive feedback to input signal and negative feedback from sensing resistance two ends, respectively in RS ＜
During ＜ RF or R1, following transmission function can be generated：
Because above-mentioned float duty and ground connection support type Voltage-controlled Current Source circuit topological structure are all using RSAs electricity
Influenza measuring resistance simultaneously carries out the feedback control of electric current output, and output current, directly through current sensing resistor RS, works as output current
When larger, on RS produce loss and heating, thus reducing the conversion efficiency of VCCS circuit, and directly affect the safety of VCCS can
By running.If selecting during the very low current sensing resistor of resistance is theoretically to reduce ohmically loss, but from mesh
From the point of view of front resistance manufacturing process, the precision of low resistance (less than 0.1 ohm) resistance is difficult to ensure that, thus the voltage conversion of VCCS
The precision of electric current hardly results in guarantee.
Content of the invention
For solving the technical problem of above-mentioned voltage control type current source, reduce the power attenuation of current sensing resistor, lifting is big
The Voltage to current transducer precision of power VCCS, the present invention provides a kind of new piezoelectric voltage control electric current source circuit, specifically side
Case is as described below.
A kind of employing CT substitute current sensing resistor Voltage-controlled Current Source circuit it is characterised in that：Including power fortune
Calculate amplifier, adopt CT and transfer resistance, sampling CT primary side is directly serially connected in the output loop of power operational amplifier, adopts
Sample CT secondary side connects transfer resistance, described transfer resistance one end ground connection, and the described transfer resistance other end passes through feedback resistance and work(
Rate operational amplifier connects the feedback carrying out voltage signal.
A kind of aforesaid employing CT substitute current sensing resistor Voltage-controlled Current Source circuit it is characterised in that：Described
Float duty type Voltage-controlled Current Source circuit includes for power operational amplifier A1, input voltage VIN, feedback resistance RF, turns
Change resistance RS, earth resistance RB and sampling CT, described input voltage VIN is connected with the positive input of power operational amplifier A1
Connect, the positive input of power operational amplifier A1 is grounded by earth resistance RB, described sampling CT primary side one end is passed through negative
Carry the outfan being directly serially connected in power operational amplifier A1, described sampling CT primary side other end ground connection, described sampling CT bis-
Secondary side joint transfer resistance RS, described transfer resistance RS one end ground connection, the described transfer resistance RS other end pass through feedback resistance RF with
The reverse input end of power operational amplifier A1 connects.
A kind of aforesaid employing CT substitute current sensing resistor Voltage-controlled Current Source circuit it is characterised in that：Described
Ground connection support type Voltage-controlled Current Source circuit includes power operational amplifier A2, input voltage VIN, feedback resistance RF, conversion
Resistance RS, input resistance RI, sample CT, and described input voltage VIN passes through the anti-of input resistance RI and power operational amplifier A2
Connect to input, the positive input of power operational amplifier A2 is grounded by input resistance RI, described sampling CT primary side
One end is serially connected in the outfan of power operational amplifier A2, and the described sampling CT primary side other end passes through carrying ground, described adopts
Sample CT secondary side connects transfer resistance RS, described transfer resistance RS one end ground connection, and the described transfer resistance RS other end passes through feedback electricity
Resistance RF is connected with the reverse input end of power operational amplifier A2.
A kind of aforesaid employing CT substitute current sensing resistor Voltage-controlled Current Source circuit it is characterised in that：Described
Power operational amplifier adopts PA50 power operational amplifier.
A kind of aforesaid employing CT substitute current sensing resistor Voltage-controlled Current Source circuit it is characterised in that：Described
Sampling CT no-load voltage ratio is 1：N, after improvement, Voltage-controlled Current Source circuit power loss is that conventional voltage control electric current source circuit is lost
1/n, n takes 100 or 1000.
The beneficial effect that the present invention is reached：
First, transfer resistance is added by the accurate CT of sampling and substitutes current sensing resistor to be directly serially connected in power operational amplifier defeated
In going out on loop, sampling CT primary side be directly serially connected on amplifier output loop, secondary side through connecing after transfer resistance, from conversion
Resistance two ends carry out the feedback of voltage signal, this avoid current sensing resistor in conventional voltage control electric current source circuit and choose
Contradiction, simultaneously because output loop does not have direct series resistor, when high current flows through, loss will not be produced, solve tradition
Voltage-controlled Current Source circuit because current sensing resistor produces relatively high power loss and makes whole Voltage-controlled Current Source efficiency fall
Low problem.
Second, the accurate CT of sampling add the introducing of transfer resistance, sampling accurate CT secondary side one end ground connection, and the other end carries out electricity
The feedback of pressure signal, compared with conventional float support type Voltage-controlled Current Source circuit, improves Voltage-controlled Current Source electric current
Fan-out capability, improve the work efficiency of voltage-controlled type current source.
3rd, the accurate CT of sampling add the introducing of transfer resistance, accurate CT secondary side one end ground connection, and the other end carries out voltage letter
Number feedback, with tradition ground connection support type Voltage-controlled Current Source circuit compared with, decrease a feedback branch, simplify electricity
Road, improves the fan-out capability of Voltage-controlled Current Source electric current, improves the work efficiency of Voltage-controlled Current Source.
Brief description
Fig. 1 is float duty type fundamental voltage control electric current source circuit.
Fig. 2 is ground connection support type fundamental voltage control electric current source circuit.
Fig. 3 is to substitute current sensing resistor float duty type Voltage-controlled Current Source circuit using accurate CT.
Fig. 4 is to substitute current sensing resistor ground connection support type Voltage-controlled Current Source circuit using accurate CT.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
Referring to Fig. 3, be applied to power system testing current High-current output 10V/36A substitutes electric current sense using accurate CT
Measuring resistance float duty type Voltage-controlled Current Source circuit, A1 is PA50 power operational amplifier, and VIN is input voltage, and RF is
Feedback resistance, RS transfer resistance, dotted line inframe is sampling CT, and described input voltage VIN passes through input resistance RI and Power arithmetic
The reverse input end of amplifier A2 connects, and the positive input of power operational amplifier A2 is grounded by input resistance RI, described
Sampling CT primary side one end is serially connected in the outfan of power operational amplifier A2, and the described sampling CT primary side other end passes through load
Ground connection, described sampling CT secondary side connects transfer resistance RS, described transfer resistance RS one end ground connection, the described transfer resistance RS other end
It is connected with the reverse input end of power operational amplifier A2 by feedback resistance RF.
The present invention sampling CT primary side directly seal in power operational amplifier output loop, secondary side through connecing transfer resistance,
Carry out the feedback of voltage signal from transfer resistance two ends.This Voltage-controlled Current Source circuit is substituted using sampling CT+ transfer resistance
Current sensing resistor is directly serially connected in amplifier output loop, solves conventional float support type Voltage-controlled Current Source circuit
Produce loss and reduce the technical barrier of current source work efficiency because high current flows through current sensing resistor, with conventional float load
Type Voltage-controlled Current Source circuit input/output relation compares, and can obtain：
As long as the transfer resistance RS in circuit after improving is the transfer resistance of n times of traditional circuit, then can ensure from electricity
The electric current that road outfan obtains is I0Equal, thus it is ensured that new while improve piezoelectric voltage control electric current source efficiency
Voltage-controlled Current Source input voltage and the linear relationship of output current, improve the precision of test.
Referring to Fig. 4, the employing CT being applied to component testing High-current output 10V/36A substitutes current sensing resistor ground connection
Support type Voltage-controlled Current Source circuit, A2 is PA50 power operational amplifier, and VIN is input voltage, and RF is feedback resistance, RS
Transfer resistance, RI is input resistance, and dotted line inframe is sampling CT, and described input voltage VIN is passed through input resistance RI and transported with power
The reverse input end calculating amplifier A2 connects, and the positive input of power operational amplifier A2 is grounded by input resistance RI, institute
State the outfan that sampling CT primary side one end is serially connected in power operational amplifier A2, the described sampling CT primary side other end passes through negative
Carry ground connection, described sampling CT secondary side connects transfer resistance RS, described transfer resistance RS one end ground connection, and described transfer resistance RS is another
End is connected with the reverse input end of power operational amplifier A2 by feedback resistance RF.
Sampling CT primary side directly seals in power operational amplifier output loop, and secondary side is through meeting transfer resistance, CT bis- times
Side one end is grounded, and the other end carries out the feedback of voltage signal.This Voltage-controlled Current Source circuit adds transfer resistance using sampling CT
Substitute current sensing resistor to be directly serially connected in amplifier output loop, simplify tradition ground connection support type Voltage-controlled Current Source
Circuit, improves the work efficiency of ground connection support type Voltage-controlled Current Source circuit, controls electricity with conventional float support type voltage
Current source circuit input/output relation is identical.As long as improve after circuit in transfer resistance RS be n times traditional circuit turn
Change resistance, then can ensure that the electric current obtaining from circuit output end is I0Equal, thus improve piezoelectric voltage control electric current source effect
While rate, simplify tradition ground connection support type Voltage-controlled Current Source circuit, improve the electric current output of voltage-controlled type current source
Ability.
The present invention substitutes the Voltage-controlled Current Source circuit of current sensing resistor due to adding conversion using CT using accurate CT
Resistance is directly serially connected in power amplifier output loop, does not have resistance directly to connect in output loop, but indirectly by
The smaller current that CT senses, to realize Voltage Feedback, this avoid in classical Voltage-controlled Current Source circuit due to high current
The loss flow through current sensing resistor and produce on resistance.The present invention has circuit topological structure letter because of the introducing of the CT that samples
List, Voltage-controlled Current Source low cost, high working efficiency, margin of safety is high, have preferable input voltage range and electric current output
The features such as scope, linear degree are good.Meanwhile, the present invention is that high current, the design of high-power type Voltage-controlled Current Source provide
One new mentality of designing.
Ultimate principle, principal character and the advantage of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not restricted to the described embodiments, the simply explanation present invention's described in above-described embodiment and description is former
Reason, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes and improvements
Both fall within scope of the claimed invention.Claimed scope is by appending claims and its equivalent circle.
Fixed.
Claims (5)
1. a kind of employing CT substitute current sensing resistor Voltage-controlled Current Source circuit it is characterised in that：Including Power arithmetic
Amplifier, sampling CT and transfer resistance, sampling CT primary side is directly serially connected in the output loop of power operational amplifier, sampling
CT secondary side connects transfer resistance, described transfer resistance one end ground connection, and the described transfer resistance other end passes through feedback resistance and power
Operational amplifier connects the feedback carrying out voltage signal.
2. a kind of employing CT according to claim 1 substitutes the Voltage-controlled Current Source circuit of current sensing resistor, and it is special
Levy and be：Float duty type Voltage-controlled Current Source circuit is included for power operational amplifier A1, input voltage VIN, feedback electricity
Resistance RF, transfer resistance RS, earth resistance RB and sampling CT, described input voltage VIN is defeated with the forward direction of power operational amplifier A1
Enter end to connect, the positive input of power operational amplifier A1 is grounded by earth resistance RB, described sampling CT primary side one end
The outfan of power operational amplifier A1 is directly serially connected in by load, described sampling CT primary side other end ground connection, described adopt
Sample CT secondary side connects transfer resistance RS, described transfer resistance RS one end ground connection, and the described transfer resistance RS other end passes through feedback electricity
Resistance RF is connected with the reverse input end of power operational amplifier A1.
3. a kind of employing CT according to claim 1 substitutes the Voltage-controlled Current Source circuit of current sensing resistor, and it is special
Levy and be：Ground connection support type Voltage-controlled Current Source circuit includes power operational amplifier A2, input voltage VIN, feedback resistance
RF, transfer resistance RS, input resistance RI, sample CT, and described input voltage VIN passes through input resistance RI and power operational amplifier
The reverse input end of A2 connects, and the positive input of power operational amplifier A2 is grounded by input resistance RI, described sampling CT
Primary side one end is serially connected in the outfan of power operational amplifier A2, and the described sampling CT primary side other end passes through carrying ground,
Described sampling CT secondary side connects transfer resistance RS, described transfer resistance RS one end ground connection, and the described transfer resistance RS other end passes through
Feedback resistance RF is connected with the reverse input end of power operational amplifier A2.
4. a kind of employing CT according to Claims 2 or 3 substitutes the Voltage-controlled Current Source circuit of current sensing resistor, its
It is characterised by：Described power operational amplifier adopts PA50 power operational amplifier.
5. a kind of employing CT according to claim 4 substitutes the Voltage-controlled Current Source circuit of current sensing resistor, and it is special
Levy and be：Described sampling CT no-load voltage ratio is 1：N, after improvement, Voltage-controlled Current Source circuit power loss is conventional voltage control electric current
The 1/n of source circuit loss, n take 100 or 1000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510690911.6A CN105278599B (en) | 2015-10-22 | 2015-10-22 | Voltage-controlled current source circuit using CT to replace current sensing resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510690911.6A CN105278599B (en) | 2015-10-22 | 2015-10-22 | Voltage-controlled current source circuit using CT to replace current sensing resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105278599A CN105278599A (en) | 2016-01-27 |
| CN105278599B true CN105278599B (en) | 2017-02-22 |
Family
ID=55147775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510690911.6A Active CN105278599B (en) | 2015-10-22 | 2015-10-22 | Voltage-controlled current source circuit using CT to replace current sensing resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105278599B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272806A (en) * | 2017-08-07 | 2017-10-20 | 哈尔滨理工大学 | The high-power VCCS of multitube parallel coupled using isolating transformer |
| CN114200998A (en) * | 2021-12-14 | 2022-03-18 | 国能神东煤炭集团有限责任公司 | Current signal output circuit for microcomputer protection device and microcomputer protection device |
| CN117420422A (en) * | 2023-12-18 | 2024-01-19 | 赛英特半导体技术(西安)有限公司 | VI source current expansion method, circuit and VI source |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101262177A (en) * | 2008-04-22 | 2008-09-10 | 英飞特电子（杭州）有限公司 | Current control synchronization commutation driving circuit |
| CN202795123U (en) * | 2012-09-28 | 2013-03-13 | 郑州万特电气有限公司 | Class-D-power-amplifier constant current source device |
| CN103151993B (en) * | 2013-01-30 | 2017-06-16 | 国家电网公司 | Accurate alternating current amplifier |
| CN205176715U (en) * | 2015-10-22 | 2016-04-20 | 国家电网公司 | Adopt CT to replace voltage control current source circuit of electric current sensing resistance |
-
2015
- 2015-10-22 CN CN201510690911.6A patent/CN105278599B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105278599A (en) | 2016-01-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105278599B (en) | Voltage-controlled current source circuit using CT to replace current sensing resistor | |
| CN104571242B (en) | Voltage regulator | |
| CN101629973B (en) | High-precision current sampling circuit without operational amplifier for low voltage power supply | |
| CN102866721B (en) | Reference voltage source circuit | |
| CN102520339B (en) | Working method of contact type circuit board testing system | |
| CN102495354B (en) | Testing method for circuit board testing system | |
| CN206657263U (en) | A kind of high-power VCCS based on Howland current sources | |
| CN105892548B (en) | Reference voltage generation circuit with temperature compensating function | |
| CN102331517A (en) | Inductive current detection circuit and DC-DC (direct current to direct current) power switch converter | |
| CN104007400B (en) | Magnetic sensor device | |
| CN104101764B (en) | Novel inductor current detection circuit applied to DC-DC converter | |
| CN103308075A (en) | Current output-type linear hall-effect sensor | |
| CN107478890A (en) | A kind of current sensing means for integrated circuit | |
| CN205176715U (en) | Adopt CT to replace voltage control current source circuit of electric current sensing resistance | |
| CN100574101C (en) | A kind of hysteresis comparator | |
| CN102175908B (en) | Method for detecting current by wiring parasitic resistors by using power tube | |
| CN103647519B (en) | A kind of input stage of operational amplifier | |
| CN206339589U (en) | Current detection circuit | |
| CN102621369A (en) | Inductance ESR (equivalent series resistance) based electric current detection circuit with potential floating function | |
| CN204575838U (en) | A kind of meter resistance measurement mechanism | |
| CN103458586A (en) | Transconductance amplifier and LED constant current drive circuit | |
| CN202041868U (en) | Direct-current constant-current source circuit with precision reference source | |
| CN206023713U (en) | A kind of single supply op zeroing circuit and amplifying circuit | |
| CN201936215U (en) | Novel high-precision constant current source circuit | |
| CN107390763A (en) | A kind of Low Drift Temperature current source circuit insensitive to power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |