CN202171609U - Current induction detection circuit - Google Patents
Current induction detection circuit Download PDFInfo
- Publication number
- CN202171609U CN202171609U CN2011201821318U CN201120182131U CN202171609U CN 202171609 U CN202171609 U CN 202171609U CN 2011201821318 U CN2011201821318 U CN 2011201821318U CN 201120182131 U CN201120182131 U CN 201120182131U CN 202171609 U CN202171609 U CN 202171609U
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- circuit
- operational amplifier
- capacitor
- resistance
- induction
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Abstract
A current induction detection circuit comprises an induction coil and an induction signal processing circuit, wherein the induction signal processing circuit comprises a protection circuit, an amplification circuit and an integrating circuit, the induction coil is sequentially connected with the protection circuit, the amplification circuit and the integrating circuit, and the integrating circuit is connected with a single chip microcomputer. The protection circuit is composed of a diode D6A and a diode D6B invertedly and parallelly connected; the amplification circuit includes an operational amplifier U1A, resistors R30, R31 and R32, and capacitors C10 and C11; the resistor R30 is connected from the output end of the operational amplifier U1A and the reverse input end of the operational amplifier U1A, forming a closed loop, and the capacitor C10 is parallelly connected with the resistor R30; the capacitor C11 is connected between the non-inverting input port and the inverting input port of the operational amplifier U1A, the inverting input port of the operational amplifier U1A is serially connected with the resistor R31, and the non-inverting input port of the operational amplifier U1A is parallelly connected with the resistor R31; the operational amplifier U1A uses a single power supply for power supply, a Vcc end is connected with the power supply, and a -VEE end is grounded; and the integrating circuit is composed of a resistor R29 and a capacitor C9, one end of the capacitor is connected with the single chip microcomputer, and the other end is grounded.
Description
Technical field
The utility model belongs to the conductor that utilizes general electricity, thereby passes to single-chip microcomputer with size of current at the magnetic field different electromotive force signal of generation that electric conductor produces different field intensity on every side, relates to a kind of induction by current detection circuit.
Background technology
Traditional inductive current inducing method normally detects resistance in the series connection of a side of inductance, or directly utilizes the conducting resistance of switching tube to detect the variation of inductive current.But the method for resistance in series has produced extra power consumption, especially in the switch power supply system of big electric current, greatly reduces the work efficiency of system; Directly utilize in the method for switching tube conducting resistance, it is bigger that the occurrence of the conducting resistance of switching tube is influenced by process deviation, has certain temperature coefficient; Make that the induction by current value is not accurate enough; In addition, when inductive current hour, need big conducting resistance to improve the precision of current detecting; But big conducting resistance will inevitably consume bigger extra power consumption, can reduce work efficiency greatly.A good inductive current induction circuit requires to have accurate inductive circuit tracking effect, receives the influence of manufacture craft, working environment as far as possible little simultaneously.
The utility model content
In order to overcome the above-mentioned shortcoming of prior art, the utility model provides that a kind of circuit is simple, stability is high, sampled data fast, need not to influence the induction by current detection circuit of circuit-under-test structure during sampling.
The utility model solves the technical scheme that its technical matters adopted: a kind of induction by current detection circuit; Comprise inductive coil and induced signal treatment circuit; Wherein: said induced signal treatment circuit comprises holding circuit, amplifying circuit and integrating circuit; Inductive coil and holding circuit holding circuit, amplifying circuit and integrating circuit are linked in sequence, and said integrating circuit is connected with single-chip microcomputer; Wherein:
Said holding circuit is made up of diode D6A and D6B reverse parallel connection;
Said amplifying circuit comprises that operational amplifier U1A, resistance R 30, R31, R32 and capacitor C 10, C11 form; Resistance R 30 constitutes closed circuit from the reverse input end that the output terminal of operational amplifier U1A is connected to operational amplifier U1A, and capacitor C 10 is connected in parallel with resistance R 30; Operational amplifier U1A is connected capacitor C 11, the reverse input end mouth resistance in series R31 of operational amplifier U1A, the parallel resistance of the input port in the same way R31 of operational amplifier U1A in the same way with in the middle of the reverse input end mouth; Operational amplifier U1A adopts single power supply, and the Vcc end connects power supply ,-V
EEEnd ground connection;
Said integrating circuit is connected in series by resistance R 29 and capacitor C 9 and forms, and capacitor C 9 one ends connect single-chip microcomputer, an end ground connection;
Improvement as the utility model: among the said inductive coil L1 electric conductor is housed;
Further improvement as the utility model: said diode D6A, D6B can adopt the BAV99 model;
Further improvement as the utility model: said operational amplifier U1A can adopt the LM358 model;
Further improvement as the utility model: said amplifying circuit and integrating circuit adopt the capacitor of high frequency;
Compared with prior art, the beneficial effect of the utility model is: this circuit can accurately be followed the tracks of the electric current in the inductance, high, the long service life of induction registration accuracy; Can accomplish the collection to current value at short notice, circuit design is easy, cost is low, circuit is simple, stability is high, sampled data is quick, need not to influence the circuit-under-test structure when sampling.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Referring to Fig. 1; A kind of induction by current detection circuit; Comprise inductive coil and induced signal treatment circuit; Wherein: said induced signal treatment circuit comprises holding circuit, amplifying circuit and integrating circuit, and inductive coil and holding circuit holding circuit, amplifying circuit and integrating circuit are linked in sequence, and said integrating circuit is connected with single-chip microcomputer; Wherein:
Said holding circuit is made up of diode D6A and D6B reverse parallel connection; The diode clamping holding circuit once can only have a diode current flow, and another is in cut-off state, thereby plays the effect of protection sample circuit;
Said amplifying circuit comprises that operational amplifier U1A, resistance R 30, R31, R32 and capacitor C 10, C11 form; Resistance R 30 constitutes closed circuit from the reverse input end that the output terminal of operational amplifier U1A is connected to operational amplifier U1A, forms a negative feedback configuration, because the voltage gain of operational amplifier U1A is very big, the use negative feedback can guarantee the stable running of circuit; Capacitor C 10 is connected in parallel with resistance R 30; Operational amplifier U1A is connected capacitor C 11, the reverse input end mouth resistance in series R31 of operational amplifier U1A, the parallel resistance of the input port in the same way R31 of operational amplifier U1A in the same way with in the middle of the reverse input end mouth; Operational amplifier U1A adopts single power supply, and the Vcc end connects power supply ,-V
EEEnd ground connection; Operational amplifier must need the power supply power supply when operate as normal; In order to guarantee the operate as normal of integrated operational amplifier internal transistor circuit; For making signal obtain maximum dynamic range, require the DC potential of signal port should be arranged on the mid point of power supply, the Vcc end can insert+power supply of 5V;
Said integrating circuit is connected in series by resistance R 29 and capacitor C 9 and forms, and capacitor C 9 one ends connect single-chip microcomputer, an end ground connection; Utilize the capacitor charge and discharge principle to carry out, this electric current passes through capacitor C 9, and on capacitor C 9, gathers electric charge, and the beginning integration produces d. c. voltage signal;
Among the said inductive coil L1 electric conductor is housed;
Said diode D6A, D6B can adopt the BAV99 model;
Said operational amplifier U1A can adopt the LM358 model;
Said amplifying circuit and integrating circuit adopt the capacitor of high frequency;
Principle of work: L1 is a magnet ring that is wound with electric wire, and magnet ring is passed electric conductor, owing to be connected with the electric conductor of electricity produces different field intensity with the size of electrical current around electric conductor magnetic field, thus the coil on the magnet ring can produce different induction electromotive forces; The electromotive force that produces on the coil amplifies through one 100 times the amplifying circuit of being made up of LM358 operational amplifier U1A, resistance R 30, R31, R32 and capacitor C 10, C11; Output port output from LM358; D. c. voltage signal of integrating circuit integration generation through R29, C9 form is passed to single-chip microcomputer; Single-chip microcomputer converts digital signal transfers to central processing unit through the A/D convertor circuit of inside, makes corresponding response by central processing unit again.
In sum; After those of ordinary skill in the art reads the utility model file; Need not creative brainwork according to the technical scheme of the utility model and technical conceive and make other various corresponding conversion scheme, all belong to the scope that the utility model is protected.
Claims (5)
1. induction by current detection circuit; Comprise inductive coil and induced signal treatment circuit; It is characterized in that: said induced signal treatment circuit comprises holding circuit, amplifying circuit and integrating circuit; Inductive coil and holding circuit, amplifying circuit and integrating circuit are linked in sequence, and said integrating circuit is connected with single-chip microcomputer; Wherein:
Said holding circuit is made up of diode D6A and D6B reverse parallel connection;
Said amplifying circuit comprises that operational amplifier U1A, resistance R 30, R31, R32 and capacitor C 10, C11 form; Resistance R 30 constitutes closed circuit from the reverse input end that the output terminal of operational amplifier U1A is connected to operational amplifier U1A, and capacitor C 10 is connected in parallel with resistance R 30; Operational amplifier U1A is connected capacitor C 11, the reverse input end mouth resistance in series R31 of operational amplifier U1A, the parallel resistance of the input port in the same way R31 of operational amplifier U1A in the same way with in the middle of the reverse input end mouth; Operational amplifier U1A adopts single power supply, and the Vcc end connects power supply ,-V
EEEnd ground connection;
Said integrating circuit is connected in series by resistance R 29 and capacitor C 9 and forms, and capacitor C 9 one ends connect single-chip microcomputer, an end ground connection.
2. a kind of induction by current detection circuit as claimed in claim 1 is characterized in that: among the said inductive coil L1 electric conductor is housed.
3. a kind of induction by current detection circuit as claimed in claim 1 is characterized in that: said diode D6A, D6B can adopt the BAV99 model.
4. a kind of induction by current detection circuit as claimed in claim 1 is characterized in that: said operational amplifier U1A can adopt the LM358 model.
5. a kind of induction by current detection circuit as claimed in claim 1 is characterized in that: said amplifying circuit and integrating circuit adopt the capacitor of high frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201821318U CN202171609U (en) | 2011-05-31 | 2011-05-31 | Current induction detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201821318U CN202171609U (en) | 2011-05-31 | 2011-05-31 | Current induction detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202171609U true CN202171609U (en) | 2012-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201821318U Expired - Fee Related CN202171609U (en) | 2011-05-31 | 2011-05-31 | Current induction detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202171609U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809016A (en) * | 2014-02-18 | 2014-05-21 | 上海零线电气有限公司 | Leakage current sampling circuit checking method for electrical fire monitoring |
| CN104345196A (en) * | 2014-10-30 | 2015-02-11 | 南京信息工程大学 | Active weak power frequency current induction coil |
| CN104345194A (en) * | 2013-07-26 | 2015-02-11 | 中国科学院上海微系统与信息技术研究所 | Superconducting quantum interference device access protection circuit |
| WO2016177209A1 (en) * | 2015-09-30 | 2016-11-10 | 中兴通讯股份有限公司 | Current detecting circuit and current detecting method |
| CN108828476A (en) * | 2018-06-27 | 2018-11-16 | 重庆湃芯入微科技有限公司 | A kind of application of high frequency limiting circuit in hardware system |
-
2011
- 2011-05-31 CN CN2011201821318U patent/CN202171609U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345194A (en) * | 2013-07-26 | 2015-02-11 | 中国科学院上海微系统与信息技术研究所 | Superconducting quantum interference device access protection circuit |
| CN104345194B (en) * | 2013-07-26 | 2017-10-03 | 中国科学院上海微系统与信息技术研究所 | A kind of SPUID accesses protection circuit |
| CN103809016A (en) * | 2014-02-18 | 2014-05-21 | 上海零线电气有限公司 | Leakage current sampling circuit checking method for electrical fire monitoring |
| CN103809016B (en) * | 2014-02-18 | 2016-05-18 | 上海零线电气有限公司 | A kind of leakage current sample circuit method of calibration for electric fire disaster monitoring |
| CN104345196A (en) * | 2014-10-30 | 2015-02-11 | 南京信息工程大学 | Active weak power frequency current induction coil |
| WO2016177209A1 (en) * | 2015-09-30 | 2016-11-10 | 中兴通讯股份有限公司 | Current detecting circuit and current detecting method |
| CN108828476A (en) * | 2018-06-27 | 2018-11-16 | 重庆湃芯入微科技有限公司 | A kind of application of high frequency limiting circuit in hardware system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Guangzhou CoreTech Electronic Products Co., Ltd. Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120321 Termination date: 20130531 |