CN203881852U - Inductance value measuring circuit - Google Patents
Inductance value measuring circuit Download PDFInfo
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- CN203881852U CN203881852U CN201420154467.7U CN201420154467U CN203881852U CN 203881852 U CN203881852 U CN 203881852U CN 201420154467 U CN201420154467 U CN 201420154467U CN 203881852 U CN203881852 U CN 203881852U
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- inductance value
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Abstract
The utility model provides an inductance value measuring circuit which comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a variable capacitance diode, a potentiometer, a voltage-controlled oscillator chip MC1648 and a voltage stabilization chip LM7805. The inductance value measuring circuit of the utility model adopts the resonance method to measure the inductance value, the measurement lower limit can reach 10nH, the measurement range is wide, the inductance value measurement in normal conditions can be satisfied, advantages of simple circuit structure and reliable and stable operation can be realized, so the inductance value measuring circuit is suitable for being popularized and applied in different inductance measuring fields and applications fields of related technologies.
Description
Technical field
The utility model relates to metering circuit field, more specifically, particularly relates to a kind of inductance value metering circuit.
Background technology
In various disasters, fire is the most often, threatens the most at large one of major casualty of public security and social development, and the mankind can utilize and control fire, is an important symbol of civilization and progress.Thus the mankind to use fiery history and the history of struggling with fire be interpromoting relation in five elements together, people, with in fiery, constantly sum up the rule of fire generation, the harm that reduces as much as possible fire and the mankind are caused.
In today of modern science and technology development, people can utilize various advanced persons or more the method for science fire is detected or prevents, reach fire nipped in the bud.For example, in electric fire disaster monitoring field, just relate to principles such as utilizing inductance fire is made to prevention and monitoring.
In reality, often can use the telefault of different parameters, the inductance value of these coils is so easily measured unlike resistance, though some digital multimeter has inductance measurement gear, measurement range is very limited.Therefore, necessary to existing inductance measurement method or the further improvement of circuit do.
Utility model content
In view of the above, the purpose of this utility model is to provide a kind of inductance value metering circuit, is not easy to measure or the very limited problem of measurement range for solving the inductance value of prior art coil.
For achieving the above object and other relevant objects, the utility model provides following technical scheme:
A kind of inductance value metering circuit, comprises resistance R 1, resistance R 2, resistance R 3, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, capacitor C 6, capacitor C 7, holds change diode, potentiometer and voltage controlled oscillator chip MC1648 and voltage stabilizing chip LM7805; Wherein, the connected mode of this voltage controlled oscillator chip MC1648 is: pin one connects the positive pole of capacitor C 3, the minus earth of capacitor C 3; Pin 3 connects the positive pole of capacitor C 5, one end of the negative pole contact resistance R3 of capacitor C 5, and the other end of resistance R 3 is as the output terminal of this inductance value metering circuit; Pin 5 connects the positive pole of capacitor C 4, the minus earth of capacitor C 4; Pin 7 and pin 8 ground connection; Pin one 0 is as the first input end of this inductance value metering circuit and connect the positive pole of capacitor C 2, the minus earth of capacitor C 2; Pin one 2 conducts are the second input end of this inductance value metering circuit, and pin one 2 connects the positive pole of capacitor C 1, the negative pole of capacitor C 1 is one end of contact resistance R1 and the negative pole of appearance change diode simultaneously, the other end of this resistance R 1 connects the second end of potentiometer, this appearance becomes the plus earth of diode, and the first end of this potentiometer and the 3rd end also connect and both ends of power; Pin one 4 is connected with pin one; All the other pins of this voltage controlled oscillator chip MC1648 are put sky; And the connected mode of voltage stabilizing chip LM7805 is: the input end of this voltage stabilizing chip LM7805 connects the positive pole of power supply and capacitor C 7, these capacitor C 7 ground connection; One end of output terminal contact resistance R2 of this voltage stabilizing chip LM7805 and the positive pole of capacitor C 6, the other end of resistance R 2 connects the pin one 4 of this voltage controlled oscillator chip MC1648, the minus earth of capacitor C 6.
Inductance value metering circuit in the above technical scheme is with resonance method inductance measuring value, measurement lower limit can reach 10nH, measurement range is very wide, can solve well the very limited problem of measurement range in prior art, and except meeting inductance value measurement under normal circumstances, this inductance value metering circuit is simple in structure, reliable and stable work.
Further, in the above inductance value metering circuit, inductance value metering circuit also comprises that one has the square radio frequency induction coil of the first link and the second link; Wherein, the length of side of this square radio frequency induction coil is 10 ± 1 cm.
As mentioned above, this inductance value metering circuit in the utility model is with resonance method inductance measuring value, measurement lower limit can reach 10nH, measurement range is very wide, the inductance value that can meet is under normal circumstances measured, circuit structure is simple, and reliable and stable work is adapted at different inductance measurement fields and the application of correlation technique and promotes the use of.
Brief description of the drawings
In order to be illustrated more clearly in the scheme in the utility model embodiment, to accompanying drawing that describe required use in specific embodiment be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit principle structure figure of a kind of inductance value metering circuit of the utility model.
Fig. 2 is the telefault structural representation in a kind of inductance value metering circuit of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiment.Based on embodiment of the present utility model, all other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belong to the scope that the utility model is protected.
In reality, often can use the telefault of different parameters, the inductance value of these coils is so easily measured unlike resistance, though some digital multimeter has inductance measurement gear, measurement range is very limited.Therefore, a kind of inductance value metering circuit is provided in the utility model embodiment, see Fig. 1, show the circuit principle structure figure of this inductance value metering circuit, its concrete theory structure is: comprise resistance R 1, resistance R 2, resistance R 3, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, capacitor C 6, capacitor C 7, hold change diode, potentiometer and voltage controlled oscillator chip MC1648 and voltage stabilizing chip LM7805; Wherein, the connected mode of this voltage controlled oscillator chip MC1648 is: pin one connects the positive pole of capacitor C 3, the minus earth of capacitor C 3; Pin 3 connects the positive pole of capacitor C 5, one end of the negative pole contact resistance R3 of capacitor C 5, and the other end of resistance R 3 is as the output terminal of this inductance value metering circuit; Pin 5 connects the positive pole of capacitor C 4, the minus earth of capacitor C 4; Pin 7 and pin 8 ground connection; Pin one 0 is as the first input end of this inductance value metering circuit and connect the positive pole of capacitor C 2, the minus earth of capacitor C 2; Pin one 2 conducts are the second input end of this inductance value metering circuit, and pin one 2 connects the positive pole of capacitor C 1, the negative pole of capacitor C 1 is one end of contact resistance R1 and the negative pole of appearance change diode simultaneously, the other end of this resistance R 1 connects the second end of potentiometer, this appearance becomes the plus earth of diode, and the first end of this potentiometer and the 3rd end also connect and both ends of power; Pin one 4 is connected with pin one; All the other pins of this voltage controlled oscillator chip MC1648 are put sky; And the connected mode of voltage stabilizing chip LM7805 is: the input end of this voltage stabilizing chip LM7805 connects the positive pole of power supply and capacitor C 7, these capacitor C 7 ground connection; One end of output terminal contact resistance R2 of this voltage stabilizing chip LM7805 and the positive pole of capacitor C 6, the other end of resistance R 2 connects the pin one 4 of this voltage controlled oscillator chip MC1648, the minus earth of capacitor C 6.Should be understood that, the value of individual part has all given sign in the drawings, but this value is a kind of optimal way, as long as unexpected other values of the value that marked in the accompanying drawings can realize of the present utility model all in protection domain of the present utility model.
Below the principle of work of above inductance value metering circuit is elaborated: the core devices of this circuit is Integrated VCO chip MC1648, utilizes its voltage-controlled characteristic to produce frequency signal at output 3 pin, can indirectly measure inductance L to be measured
xvalue, measuring accuracy is high; In addition, BB809 is varactor, in figure potentiometer VR1 right+15V carries out dividing potential drop, regulates this potentiometer can obtain different Voltage-outputs, this voltage is added on varactor BB809 and can be obtained different electric capacitys by R1.Measure tested inductance L
xtime, only need be by L
xreceive in 2 of A in figure, B, then regulator potentiometer VR1 makes circuit resonance, can export the oscillator signal of certain frequency at 3 pin of MC1648, measures the frequency values that C is ordered with frequency meter, just can be by calculating LX value.?
Circuit resonant frequencies: f
0=1/2 π
So L
x=1/4 π
2f
0 2c
Resonance frequency f in formula
0be the 3 pin output frequency value of MC1648, C is the varactor that potentiometer VR1 sets up
Capacitance, to calculate as seen L
xvalue also need first to know C value, need potentiometer VR1 scale and varactor for this reason
Respective value make calibration.
Further, in order to calibrate the electric capacity between varactor and potentiometer, a square radio frequency induction coil with the first link and the second link can be set in the above inductance value metering circuit again; Wherein, the length of side of this square radio frequency induction coil is 10 ± 1 cm.See Fig. 2, show the square radio frequency induction coil structural representation in this inductance value metering circuit.In the time of calibration, the A ' that square radio frequency induction coil is connect and B ' correspondence are connected on A, B two ends in Fig. 1, regulator potentiometer VR1 is to different scale positions, corresponding measured value can be measured at C point, then the electric capacity of varactor at the different scales of potentiometer VR1 index dial can be calculated according to resonance formula above.Following table 1 has provided actual measurement sampling corresponding relation.
| Concussion frequency (MHz) | 98 | 76 | 62 | 53 | 43 | 38 | 34 |
| Varactor C value | 6 | 10 | 15 | 20 | 30 | 40 | 50 |
Table 1
Normal work, regulator potentiometer VR1 gets multiple points of slip and the corresponding relation of varactor, and it is convenient to ensure to measure.This measuring method belongs to indirect measurement, but measurement range is wide, measures accurately.So the utility model has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Claims (3)
1. an inductance value metering circuit, comprise resistance R 1, resistance R 2, resistance R 3, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, capacitor C 6, capacitor C 7, hold change diode, potentiometer and voltage controlled oscillator chip MC1648 and voltage stabilizing chip LM7805, it is characterized in that:
The connected mode of this voltage controlled oscillator chip MC1648 is: pin one connects the positive pole of capacitor C 3, the minus earth of capacitor C 3; Pin 3 connects the positive pole of capacitor C 5, one end of the negative pole contact resistance R3 of capacitor C 5, and the other end of resistance R 3 is as the output terminal of this inductance value metering circuit; Pin 5 connects the positive pole of capacitor C 4, the minus earth of capacitor C 4; Pin 7 and pin 8 ground connection; Pin one 0 is as the first input end of this inductance value metering circuit and connect the positive pole of capacitor C 2, the minus earth of capacitor C 2; Pin one 2 conducts are the second input end of this inductance value metering circuit, and pin one 2 connects the positive pole of capacitor C 1, the negative pole of capacitor C 1 is one end of contact resistance R1 and the negative pole of appearance change diode simultaneously, the other end of this resistance R 1 connects the second end of potentiometer, this appearance becomes the plus earth of diode, and the first end of this potentiometer and the 3rd end also connect and both ends of power; Pin one 4 is connected with pin one; All the other pins of this voltage controlled oscillator chip MC1648 are put sky;
The connected mode of voltage stabilizing chip LM7805 is: the input end of this voltage stabilizing chip LM7805 connects the positive pole of power supply and capacitor C 7, these capacitor C 7 ground connection; One end of output terminal contact resistance R2 of this voltage stabilizing chip LM7805 and the positive pole of capacitor C 6, the other end of resistance R 2 connects the pin one 4 of this voltage controlled oscillator chip MC1648, the minus earth of capacitor C 6.
2. inductance value metering circuit according to claim 1, is characterized in that, inductance value metering circuit also comprises that one has the square radio frequency induction coil of the first link and the second link.
3. inductance value metering circuit according to claim 2, is characterized in that, the length of side of this square radio frequency induction coil is 10 ± 1 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420154467.7U CN203881852U (en) | 2014-04-01 | 2014-04-01 | Inductance value measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420154467.7U CN203881852U (en) | 2014-04-01 | 2014-04-01 | Inductance value measuring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203881852U true CN203881852U (en) | 2014-10-15 |
Family
ID=51682337
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420154467.7U Expired - Fee Related CN203881852U (en) | 2014-04-01 | 2014-04-01 | Inductance value measuring circuit |
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| CN (1) | CN203881852U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855591A (en) * | 2016-12-15 | 2017-06-16 | 广东威创视讯科技股份有限公司 | A kind of power supply inductance measurement device |
-
2014
- 2014-04-01 CN CN201420154467.7U patent/CN203881852U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106855591A (en) * | 2016-12-15 | 2017-06-16 | 广东威创视讯科技股份有限公司 | A kind of power supply inductance measurement device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 Termination date: 20150401 |
|
| EXPY | Termination of patent right or utility model |