CN105223533B - A kind of superhigh precision quick response DC current prover circuit - Google Patents
A kind of superhigh precision quick response DC current prover circuit Download PDFInfo
- Publication number
- CN105223533B CN105223533B CN201510740020.7A CN201510740020A CN105223533B CN 105223533 B CN105223533 B CN 105223533B CN 201510740020 A CN201510740020 A CN 201510740020A CN 105223533 B CN105223533 B CN 105223533B
- Authority
- CN
- China
- Prior art keywords
- current
- triode
- voltage
- resistance
- connect
- 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
Abstract
The invention discloses a kind of superhigh precision quick response DC current prover circuits, including power supply circuit and current detecting and compensation circuit, power supply circuit accesses alternating current, power supply circuit is connect by high-power resistance and current detecting with compensation circuit, current detecting and the pure DC current of compensation circuit output high-precision, alternating current connect output ripple DC voltage with power supply circuit, pulsating dc voltage is converted to pulsating direct current electric current by high-power resistance and flows into current detecting and compensation circuit, compensation electric current and pulsating direct current electric current converge the pure DC current of output high-precision.Alternating current exports low pressure power-frequency voltage by transformer, obtains pulsating dc voltage after rectifying and wave-filtering.High-precision quick response current sensor acquires pulsating direct current and exports DC voltage, and DC voltage is compared with Voltage stabilizing module afterwards by forming a depth closed loop configuration, by circuit compensation pulsating direct current, becoming pure DC current after operational amplifier.
Description
Technical field
The present invention relates to a kind of DC constant current power supply circuits for current sensor precision calibrator (-ter) unit, more particularly, to one
Kind superhigh precision quick response DC current prover circuit.
Background technique
The fused more and more new technologies of power-supply device.Such as Switching Power Supply, hard switching, Sofe Switch, parameter are steady
Pressure, linear feedback pressure stabilizing, magnetic amplifier technology, numerical controlled voltage, PWM, SPWM, electromagnetic compatibility etc..Actual demand pushes directly on
Power technology continues to develop and progress, in order to detect and show electric current automatically, and has when the Harms such as overcurrent, over-voltage occur
Have automatic protection functions and more advanced intelligent control, with sensing detection, sense samples, sensing protection power technology gradually at
Trend, the sensor for detecting current or voltage just come into being and start the favor by numerous circuit designers in China.
Currently, the constant-current circuit for current sensor calibration in the market is to generate DC voltage based on Switching Power Supply to lead to
DC current is generated after crossing resistance.The control of precision is the voltage that resistance both ends are acquired by MCPU, control switch electricity after calculating
Source output voltage.The realization of such prover is simple, but there is many deficiencies, mainly has some: 1, Switching Power Supply
High-frequency noise can be introduced, causes current source impure, influences pick up calibration precision.2, sampling resistor price is high, and fever is serious.3,
Overall precision is not high, and temperature drift is serious.4, the electric current stable time is long, and the response time is slow.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of low costs, the superelevation of Low Drift Temperature, the pure no clutter of electric current
Precision quick response DC current prover circuit.
The technical scheme of the invention to solve the technical problem is: a kind of superhigh precision quick response DC current
Prover circuit, including power supply circuit and current detecting and compensation circuit, the power supply circuit access alternating current, supply
Electric power circuit is connect by high-power resistance and current detecting with compensation circuit, and the current detecting and compensation circuit export
Pure DC current in high precision, the power supply circuit include voltage reduction module, rectification module and filter module, the city
Electricity connect the successively output ripple DC voltage after voltage reduction module, rectification module, filter module with power supply circuit, described
Pulsating dc voltage be converted to pulsating direct current electric current by high-power resistance and flow into current detecting and compensation circuit, the electricity
Stream detection and compensation circuit include Hall current detection module, comparison module and power output module, the Rectified alternating current
Output voltage feedback signal after stream is detected by Hall current detection module, voltage feedback signal input comparison module and benchmark
Voltage relatively after compensation electric current exported by power output module, the compensation electric current and pulsating direct current electric current converge export it is high-precision
Spend pure DC current.
The power supply circuit includes first diode, the second diode, third diode, the 4th diode,
Three capacitors, the second capacitor, the 9th resistance, three-terminal voltage-stabilizing pipe and the second triode, the anode and third of the first diode
The cathode of diode connects and composes branch one, and the cathode of the anode and the 4th diode of second diode connects and composes branch
Road two, the branch one, branch two, third capacitor, the second capacitor and the 9th resistor coupled in parallel, the third diode is just
Pole ground connection, the plus earth of the 4th diode are connected between the base stage and collector of second triode by the tenth resistance
It connects, one end of the tenth resistance is connect with the base stage of the second triode, the other end of the tenth resistance and first diode
Cathode connection, the other end of the tenth resistance are connect with pulsating dc voltage output end, the hair of second triode
Emitter-base bandgap grading is connected with DC voltage-stabilizing output end, and the emitter of the second triode is connected by the anode of the 4th capacitor and third diode
It connects, the output end of the three-terminal voltage-stabilizing pipe is connect with the base stage of the second triode, and the input terminal of three-terminal voltage-stabilizing pipe passes through the 8th
Resistance is connect with the emitter of the second triode, and the input terminal of the three-terminal voltage-stabilizing pipe passes through the 7th resistance and three-terminal voltage-stabilizing pipe
Ground terminal connection, the three-terminal voltage-stabilizing pipe ground terminal ground connection.
The alternating current pass through transformer after export, two output ports of transformer respectively with the anode of first diode,
The anode of second diode is connected.
The current detecting and compensation circuit include Hall current detection module and comparison module and power output module,
The Hall current detection module includes magnetic core coil, HALL device, the first triode and the first operational amplifier, described
First pin of HALL device is connect by first resistor with DC voltage-stabilizing output end, and the second pin of HALL device passes through third
Resistance is connect with the reverse input end of the first operational amplifier, and the 4th pipe pin of HALL device passes through the 4th resistance and the first fortune
The in-phase output end connection of amplifier is calculated, the third pin of the HALL device passes through the electricity of second resistance and the first triode
The connection of source cathode, the inverting input terminal of first operational amplifier pass through concatenated first capacitor, the 5th resistance and first
The emitter of triode connects, and the positive pole of the first operational amplifier is connect with DC voltage-stabilizing output end, the first operation amplifier
The power cathode of device is grounded, and the output end of the first operational amplifier is connect with the base stage of the first triode, the one or three pole
The collector of pipe is connect with DC voltage-stabilizing output end.
The magnetic core coil is that permalloy magnetic core is outer around 5000 circle copper wire, and the HALL device is located at magnetic core coil
Interior, the pure DC current of the high-precision connects after the magnetic core coil with the power cathode of the first operational amplifier
It connects, one end of the magnetic core coil is connect with the emitter of the first triode, and the other end of magnetic core coil passes through sample resistance
It is connect with the power cathode of the first operational amplifier, the other end output voltage feedback signal of the magnetic core coil.
The comparison module and power output module includes the 6th zener diode, second operational amplifier, the three or three
Pole pipe, the 4th triode, the 5th triode and the 6th triode, the plus earth of the 6th zener diode, the 6th is steady
The cathode of diode is pressed to connect by the in-phase output end of twelfth resistor and second operational amplifier, the 6th zener diode
Cathode is connect by the 19th resistance with DC voltage-stabilizing output end, and the voltage feedback signal passes through eleventh resistor and second
The reverse input end of operational amplifier connects, and the output end of the second operational amplifier and the base stage of third transistor connect
It connects, the 7th capacitor and is connected between the reverse input end of the second operational amplifier and the emitter of third transistor
13 resistance are connected with the 6th electricity between the reverse input end of the second operational amplifier and the emitter of the 4th triode
Hold and connect with the 14th resistance, the emitter of the third transistor with the base stage of the 4th triode,
The collector of the third transistor, the collector of the 4th triode, the collector of the 5th triode, the six or three
The collector of pole pipe is connect with one end of high-power resistance respectively, the emitter of the 4th triode, the 5th triode
Emitter, the 6th triode emitter pass through the 15th resistance, the 16th resistance, the 17th resistance and high-power resistance respectively
Other end connection, the base stage of the 5th triode is connected with the base stage of the 4th triode, the 6th triode
Base stage is connected with the base stage of the 5th triode, and one end of the high-power resistance is connect with pulsating dc voltage output end, institute
The other end for the high-power resistance stated exports to obtain the pure DC current of high-precision.
Compared with the prior art, the advantages of the present invention are as follows alternating currents to export low pressure power-frequency voltage, rectification filter by transformer
Pulsating dc voltage is obtained after wave.Pulsating dc voltage only has 50HZ clutter, by obtaining Rectified alternating current after high-power resistance
Stream.High-precision quick response current sensor acquires pulsating direct current and exports DC voltage, after DC voltage is compared with Voltage stabilizing module
After operational amplifier, a depth closed loop configuration is formed, by circuit compensation pulsating direct current, becomes pure direct current
Electric current.The present invention can be realized low cost, the calibration of high-precision DC current, and this circuit Low Drift Temperature, fast response time, output
The pure no clutter of electric current.
Detailed description of the invention
Fig. 1 is circuit block diagram of the invention；
Fig. 2 is the circuit of power supply circuit；
Fig. 3 is Hall current detection module；
Fig. 4 is comparison module and power output module.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
It is as shown in Figures 1 to 4: a kind of superhigh precision quick response DC current prover circuit, including power supply electricity
Road 1 and current detecting and compensation circuit 2, power supply circuit 1 access alternating current, and power supply circuit 1 passes through high-power resistance R18
It is connect with current detecting with compensation circuit 2, current detecting and the output pure DC current IDC of high-precision of compensation circuit 2, power supply electricity
Source circuit 1 includes voltage reduction module 3, rectification module 4 and filter module 5, and alternating current is connect successively by decompression with power supply circuit 1
Output ripple DC voltage ADCVCC after module 3, rectification module 4, filter module 5, pulsating dc voltage ADCVCC is through excessive function
Rate resistance R18 is converted to pulsating direct current electric current IADC1 and flows into current detecting and compensation circuit 2, and current detecting and compensation circuit 2 are wrapped
Hall current detection module 6, comparison module 7 and power output module 8 are included, pulsating direct current electric current IADC1 is detected by Hall current
Output voltage feedback signal COMV1 after module 6 is detected, voltage feedback signal COMV1 input comparison module 7 and reference voltage
Compensation electric current IADC2 is exported by power output module 8 after comparing, compensation electric current IADC2 and pulsating direct current electric current IADC1 converges defeated
The pure DC current IDC of high-precision out.
Power supply circuit 1 include first diode D1, the second diode D2, third diode D3, the 4th diode D4,
Third capacitor C3, the second capacitor C2, the 9th resistance R9, three-terminal voltage-stabilizing pipe D5 and the second triode Q2, first diode D1 is just
The cathode of pole and third diode D3 connect and compose branch one, and the anode of the second diode D2 connects with the cathode of the 4th diode D4
It connects and constitutes branch two, branch one, branch two, third capacitor C3, the second capacitor C2 are in parallel with the 9th resistance R9, third diode D3
Plus earth, the plus earth of the 4th diode D4, between the base stage and collector of the second triode Q2 pass through the tenth resistance
R10 connection, one end of the tenth resistance R10 are connect with the base stage of the second triode Q2, the other end and the one or two of the tenth resistance R10
The cathode of pole pipe D1 connects, and the other end of the tenth resistance R10 is connect with pulsating dc voltage ADCVCC output end, the second triode
The emitter of Q2 is connected with DC voltage-stabilizing output end DCVCC, and the emitter of the second triode Q2 passes through the 4th capacitor C4 and third
The anode connection of diode D3, the output end of three-terminal voltage-stabilizing pipe D5 are connect with the base stage of the second triode Q2, three-terminal voltage-stabilizing pipe D5
Input terminal connect with the emitter of the second triode Q2 by the 8th resistance R8, the input terminal of three-terminal voltage-stabilizing pipe D5 passes through the 7th
Resistance R7 is connect with the ground terminal of three-terminal voltage-stabilizing pipe D5, the ground terminal ground connection of three-terminal voltage-stabilizing pipe D5.
Alternating current exports after passing through transformer transformer, and two output ports of transformer transformer are respectively with the
The anode of one diode D1, the anode of the second diode D2 are connected.
Current detecting and compensation circuit 2 include Hall current detection module 6 and comparison module 7 and power output module 8, suddenly
Your current detection module includes magnetic core coil, HALL device, the first triode Q1 and the first operational amplifier OPIA, HALL device
The first pin connect with DC voltage-stabilizing output end DCVCC by first resistor R1, the second pin of HALL device passes through third
Resistance R3 is connect with the reverse input end of the first operational amplifier OPIA, and the 4th pipe pin of HALL device passes through the 4th resistance R4
It is connect with the in-phase output end of the first operational amplifier OPIA, the third pin of HALL device passes through second resistance R2 and the one or three
The power cathode of pole pipe Q1 connects, and the inverting input terminal of the first operational amplifier OPIA passes through concatenated first capacitor C1, the 5th
Resistance R5 is connect with the emitter of the first triode Q1, the positive pole and DC voltage-stabilizing output end of the first operational amplifier OPIA
DCVCC connection, the power cathode ground connection of the first operational amplifier OPIA, the output end and the one or three of the first operational amplifier OPIA
The base stage of pole pipe Q1 connects, and the collector of the first triode Q1 is connect with DC voltage-stabilizing output end DCVCC.
Magnetic core coil is outside permalloy magnetic core around 5000 circle copper wire, and HALL device is located in magnetic core coil, and high-precision is pure
Net DC current IDC is connect after passing through magnetic core coil with the power cathode of the first operational amplifier OPIA, one end of magnetic core coil
It is connect with the emitter of the first triode Q1, the other end of magnetic core coil passes through sample resistance R6 and the first operational amplifier OPIA
Power cathode connection, the other end output voltage feedback signal COMV1 of magnetic core coil.
Comparison module 7 and power output module 8 include the 6th zener diode D6, second operational amplifier OPIB, third
Triode Q3, the 4th triode Q4, the 5th triode Q5 and the 6th triode Q6, the plus earth of the 6th zener diode D6,
The cathode of 6th zener diode D6 is connect by twelfth resistor R12 with the in-phase output end of second operational amplifier OPIB,
The cathode of 6th zener diode D6 is connect by the 19th resistance R19 with DC voltage-stabilizing output end DCVCC, voltage feedback signal
COMV1 is connect by eleventh resistor R11 with the reverse input end of second operational amplifier OPIB, second operational amplifier OPIB
Output end connect with the base stage of third transistor Q3, the reverse input end of second operational amplifier OPIB and third transistor Q3
Emitter between be connected with the 7th capacitor C7 and thirteenth resistor R13, the reverse input end of second operational amplifier OPIB with
The 6th capacitor C6 and the 14th resistance R14, the emitter of third transistor Q3 are connected between the emitter of 4th triode Q4
It is connect with the base stage of the 4th triode Q4,
The collector of third transistor Q3, the collector of the 4th triode Q4, the collector of the 5th triode Q5, the six or three
The collector of pole pipe Q6 is connect with one end of high-power resistance R18 respectively, emitter, the 5th triode Q5 of the 4th triode Q4
Emitter, the 6th triode Q6 emitter pass through the 15th resistance R15, the 16th resistance R16, the 17th resistance respectively
R17 is connect with the other end of high-power resistance R18, and the base stage of the 5th triode Q5 is connected with the base stage of the 4th triode Q4, the
The base stage of six triode Q6 is connected with the base stage of the 5th triode Q5, one end of high-power resistance R18 and pulsating dc voltage
The connection of ADCVCC output end, the other end of high-power resistance R18 export to obtain the pure DC current IDC of high-precision.
Pulsating dc voltage ADCVCC output, powers for power output module 8, DC voltage-stabilizing output end DCVCC, to compare
Module 7 is powered.
Hall current detection module is high-precision quick response Hall current detection module 6.Hall power supply is 1V or so, the
One resistance R1, second resistance R2 are dropping resistor.First capacitor C1, the 5th resistance R5 guarantee that the first operational amplifier OPIA is steady
Fixed, nonoscillatory.Magnetic core coil exports electric current and is converted into voltage by sample resistance R6.First triode Q1 is to increase the first operation
The fan-out capability of amplifier OPIA.When input current IDC is 0A, the second pin of HALL device, the output of the 4th pin are 0V,
Magnetic core coil output is 0A, and voltage feedback signal COMV1 is 0V.When input current IDC electric current is I1, HALL device has voltage
Output, the first operational amplifier OPIA by high power gain, the first operational amplifier OPIA output voltage, magnetic core coil output
Feedback current I2, as I1 ≈ 5000*I2, Hall output is approximately equal to 0V, and circuit reaches balance, and I2 stablizes output electric current I2, I2
Pass through sample resistance R6, output voltage feedback signal COMV1.
7th capacitor C7, the 6th capacitor C6, the 14th resistance R14, thirteenth resistor R13 are to guarantee second operational amplifier
OPIB steady operation.4th triode Q4, the 5th triode Q5, the 6th triode Q6, third transistor Q3 are power take off
Part.The voltage feedback signal COMV1 and reference voltage V2 of high-precision hall current sensor output are compared, when Voltage Feedback is believed
When number COMV1 is less than V2, compensation electric current IADC2 increases.As voltage feedback signal COMV1 > V2, compensation electric current IADC2 subtracts
It is small, until voltage feedback signal COMV1=V2.It is harmonized by the susceptibility of high-precision hall current sensor, so that it may accurate
Acquisition needed for the pure DC current IDC of high-precision.
Claims (7)
1. a kind of superhigh precision quick response DC current prover circuit, it is characterised in that including power supply circuit and electric current
Detection and compensation circuit, the power supply circuit access alternating current, and power supply circuit is examined by high-power resistance and electric current
Survey is connect with compensation circuit, the current detecting and the pure DC current of compensation circuit output high-precision, the power supply electricity
Source circuit includes voltage reduction module, rectification module and filter module, and the alternating current is connect successively by drop with power supply circuit
Output ripple DC voltage after die block, rectification module, filter module, the pulsating dc voltage turn by high-power resistance
It is changed to pulsating direct current electric current and flows into current detecting and compensation circuit, the current detecting and compensation circuit include Hall current inspection
Module, comparison module and power output module are surveyed, after the pulsating direct current electric current is detected by Hall current detection module
Output voltage feedback signal, voltage feedback signal are exported by power output module after inputting comparison module compared with reference voltage and are mended
Electric current is repaid, the compensation electric current and pulsating direct current electric current converge the pure DC current of output high-precision.
2. a kind of superhigh precision quick response DC current prover circuit according to claim 1, it is characterised in that institute
The power supply circuit stated includes first diode, the second diode, third diode, the 4th diode, third capacitor, second
Capacitor, the 9th resistance, three-terminal voltage-stabilizing pipe and the second triode, the cathode of the anode and third diode of the first diode
Branch one is connected and composed, the cathode of the anode and the 4th diode of second diode connects and composes branch two, described
Branch one, branch two, third capacitor, the second capacitor and the 9th resistor coupled in parallel, the plus earth of the third diode, the 4th
The plus earth of diode is connected between the base stage and collector of second triode by the tenth resistance, and described the
One end of ten resistance is connect with the base stage of the second triode, and the other end of the tenth resistance and the cathode of first diode connect, institute
The other end for the tenth resistance stated is connect with pulsating dc voltage output end, and the emitter of second triode is connected with directly
Output end of pressure-stabilizing is flowed, the emitter of the second triode is connect by the 4th capacitor with the anode of third diode, three ends
The output end of voltage-stabiliser tube is connect with the base stage of the second triode, and the input terminal of three-terminal voltage-stabilizing pipe passes through the 8th resistance and the two or three pole
The emitter of pipe connects, and the input terminal of the three-terminal voltage-stabilizing pipe is connect by the 7th resistance with the ground terminal of three-terminal voltage-stabilizing pipe,
The ground terminal of the three-terminal voltage-stabilizing pipe is grounded.
3. a kind of superhigh precision quick response DC current prover circuit according to claim 2, it is characterised in that institute
The alternating current stated pass through transformer after export, two output ports of transformer respectively with the anode of first diode, the second diode
Anode be connected.
4. a kind of superhigh precision quick response DC current prover circuit according to claim 2, it is characterised in that institute
The current detecting and compensation circuit stated include Hall current detection module and comparison module and power output module, the Hall
Current detection module includes magnetic core coil, HALL device, the first triode and the first operational amplifier, the HALL device
First pin is connect by first resistor with DC voltage-stabilizing output end, and the second pin of HALL device passes through 3rd resistor and first
The reverse input end of operational amplifier connects, and the 4th pipe pin of HALL device passes through the 4th resistance and the first operational amplifier
The third pin of in-phase output end connection, the HALL device is connected by the power cathode of second resistance and the first triode
It connects, the inverting input terminal of first operational amplifier passes through concatenated first capacitor, the 5th resistance and the first triode
Emitter connection, the positive pole of the first operational amplifier are connect with DC voltage-stabilizing output end, the power supply of the first operational amplifier
Cathode ground connection, the output end of the first operational amplifier are connect with the base stage of the first triode, the current collection of first triode
Pole is connect with DC voltage-stabilizing output end.
5. a kind of superhigh precision quick response DC current prover circuit according to claim 4, it is characterised in that institute
The magnetic core coil stated is that permalloy magnetic core is outer around 5000 circle copper wire, and the HALL device is located in magnetic core coil, described
Pure DC current is connect after passing through the magnetic core coil with the power cathode of the first operational amplifier in high precision, the magnetic
One end of core coil is connect with the emitter of the first triode, and the other end of magnetic core coil is put by sample resistance and the first operation
The power cathode connection of big device, the other end output voltage feedback signal of the magnetic core coil.
6. a kind of superhigh precision quick response DC current prover circuit according to claim 5, it is characterised in that institute
The comparison module and power output module stated include the 6th zener diode, second operational amplifier, third transistor, the four or three
Pole pipe, the 5th triode and the 6th triode, the plus earth of the 6th zener diode, the 6th zener diode are born
Pole is connected by the in-phase output end of twelfth resistor and second operational amplifier, and the cathode of the 6th zener diode passes through the tenth
Nine resistance are connect with DC voltage-stabilizing output end, and the voltage feedback signal passes through eleventh resistor and second operational amplifier
Reverse input end connection, the output end of the second operational amplifier and the base stage of third transistor connect, and described second
The 7th capacitor and thirteenth resistor are connected between the reverse input end of operational amplifier and the emitter of third transistor, it is described
The reverse input end of second operational amplifier and the emitter of the 4th triode between be connected with the 6th capacitor and the 14th electricity
Resistance, the emitter of the third transistor are connect with the base stage of the 4th triode.
7. a kind of superhigh precision quick response DC current prover circuit according to claim 6, it is characterised in that institute
The collector for the third transistor stated, the collector of the 4th triode, the collector of the 5th triode, the 6th triode current collection
Pole is connect with one end of high-power resistance respectively, the emitter of the 4th triode, the emitter of the 5th triode, the 6th
The other end that the emitter of triode passes through the 15th resistance, the 16th resistance, the 17th resistance and high-power resistance respectively connects
It connects, the base stage of the 5th triode is connected with the base stage of the 4th triode, the base stage and the 5th of the 6th triode
The base stage of triode is connected, and one end of the high-power resistance is connect with pulsating dc voltage output end, and described is high-power
The other end of resistance exports to obtain the pure DC current of high-precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510740020.7A CN105223533B (en) | 2015-10-30 | 2015-10-30 | A kind of superhigh precision quick response DC current prover circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510740020.7A CN105223533B (en) | 2015-10-30 | 2015-10-30 | A kind of superhigh precision quick response DC current prover circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105223533A CN105223533A (en) | 2016-01-06 |
| CN105223533B true CN105223533B (en) | 2019-01-25 |
Family
ID=54992593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510740020.7A Active CN105223533B (en) | 2015-10-30 | 2015-10-30 | A kind of superhigh precision quick response DC current prover circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105223533B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11402456B2 (en) * | 2020-08-24 | 2022-08-02 | Monolithic Power Systems, Inc. | High voltage current sensing circuit with adaptive calibration |
| CN114764259A (en) | 2021-01-11 | 2022-07-19 | 台达电子企业管理（上海）有限公司 | Current control device and power conversion system using the same |
| CN112953171B (en) * | 2021-01-19 | 2024-01-09 | 河南检亿科技有限公司 | High-precision power supply based on direct-current resistance measurement and implementation method thereof |
| CN113514788A (en) * | 2021-04-22 | 2021-10-19 | 特变电工山东鲁能泰山电缆有限公司 | Calibration device and calibration method for cable fault locator by bridge method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2095500U (en) * | 1991-07-09 | 1992-02-05 | 长沙水利电力师范学院 | Compensation monitor for arcing coil |
| CN2369269Y (en) * | 1998-12-30 | 2000-03-15 | 中国科学院近代物理研究所 | Flexible switch power supplier with large power high stability D. C. current stabilizer |
| CN101958656A (en) * | 2010-07-30 | 2011-01-26 | 中国科学技术大学 | Analogue and digital hybrid double-loop control stabilized current supply device |
| CN202256454U (en) * | 2011-10-12 | 2012-05-30 | 长沙南车电气设备有限公司 | Current sensor |
| CN203012576U (en) * | 2012-11-29 | 2013-06-19 | 云南省计量测试技术研究院 | Direct current constant current source |
| CN204119071U (en) * | 2014-09-28 | 2015-01-21 | 江西久鹰照明电器有限公司 | A kind of simple and easy LED constant current source of energy Antisurge current |
| CN104597956A (en) * | 2015-01-22 | 2015-05-06 | 国网河南省电力公司电力科学研究院 | Adjustable direct-current constant-current source generation device and method based on microcontroller |
| CN205103391U (en) * | 2015-10-30 | 2016-03-23 | 宁波锦澄电子科技股份有限公司 | Ultrahigh precision quick response direct current normalizing device circuit |
-
2015
- 2015-10-30 CN CN201510740020.7A patent/CN105223533B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105223533A (en) | 2016-01-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105223533B (en) | A kind of superhigh precision quick response DC current prover circuit | |
| CN103487767B (en) | A kind of load driving circuits and electronic load | |
| CN101923111A (en) | Isolation detection circuit of DC bus voltage | |
| CN107422179A (en) | New power supply sample circuit, the power supply method of sampling and its low-voltage circuit breaker | |
| CN205123588U (en) | It turns over to keep apart swashs formula high frequency switching power supply and input voltage detection circuitry thereof | |
| CN206223841U (en) | A kind of low-voltage testing circuit and half-bridge driven chip | |
| CN210037952U (en) | Detection circuit, chip and electronic equipment of load current direction | |
| CN204188299U (en) | Multichannel IGBT inner NTC high temperature real-time detection circuit | |
| CN103612039B (en) | Inverter welder output current detecting circuit based on AC signal and detecting method | |
| CN208258144U (en) | A kind of positive alternating current sampling circuit altogether with output voltage clamper | |
| CN205103391U (en) | Ultrahigh precision quick response direct current normalizing device circuit | |
| CN203870150U (en) | Isolation type power grid detector | |
| CN207096322U (en) | Power supply sample circuit and its low-voltage circuit breaker based on single electric current transformer | |
| CN205958641U (en) | Current detection circuit | |
| CN105425022A (en) | Simple detection circuit for mains voltage | |
| CN106405189B (en) | Current sensor with temperature stability and measuring method thereof | |
| CN104596599B (en) | Excitation high pressure automatic control device | |
| CN208537614U (en) | Current detection means | |
| CN106597091A (en) | DC electric energy meter | |
| CN208939925U (en) | A kind of analog to digital conversion circuit with linear isolation characteristic | |
| CN207318573U (en) | A kind of milliampere level current sensing means for 220V power cords | |
| CN204832315U (en) | Two -way current detection circuit | |
| CN110244104A (en) | A kind of ac current measurement circuit | |
| CN209432908U (en) | A kind of PWM duty cycle measurement board | |
| CN203037713U (en) | Multiple-signal collection device used for fire hazard detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: BaoFeng road 315599 in Zhejiang Province in the eastern suburbs of Fenghua Development Zone, No. 61 Ningbo Jin Cheng Electronic Technology Co., Ltd. Applicant after: NINGBO JINCHENG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: BaoFeng road 315599 in Zhejiang Province in the eastern suburbs of Fenghua Development Zone, No. 61 Ningbo Jin Cheng Electronic Technology Co., Ltd. Applicant before: NINGBO JINCHENG ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200210 Address after: Fenghua City Yuelin Street East Development Zone 315500 Zhejiang city of Ningbo Province Patentee after: Fenghua Yuanli plastic products factory Address before: BaoFeng road 315599 in Zhejiang Province in the eastern suburbs of Fenghua Development Zone, No. 61 Ningbo Jin Cheng Electronic Technology Co., Ltd. Patentee before: NINGBO JINCHENG ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230815 Address after: 4th Floor, Building 6, Liandong U Valley, No.1 Shengyuan Road, Jiangkou Street Economic Development Zone, Fenghua District, Ningbo City, Zhejiang Province, 315500 Patentee after: Ningbo Tianmagnet Electronics Technology Co.,Ltd. Address before: 315500 East Suburb Development Zone, Yuelin street, Fenghua City, Ningbo City, Zhejiang Province Patentee before: Fenghua Yuanli plastic products factory |
|
| TR01 | Transfer of patent right |