CN211554150U

CN211554150U - Inductance measuring device based on singlechip

Info

Publication number: CN211554150U
Application number: CN201922330666.4U
Authority: CN
Inventors: 肖冉娉; 肖文玲
Original assignee: College Of Science And Technology Of China Three Gorges University
Current assignee: College Of Science And Technology Of China Three Gorges University
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-09-22
Anticipated expiration: 2029-12-23

Abstract

The utility model provides an inductance measuring device based on singlechip, low-voltage apparatus and electronic information field, inductance and power frequency and electric capacity size relation when can obtain resonance state through the characteristic under the resonance state of RLC circuit, use the big or small power of fixed frequency, measure and learn electric capacity size, can obtain the inductance size, this device test inductance size convenient and fast can generate the inductance value automatically and show, is applicable to teaching and the demarcation of mill production inductance.

Description

Inductance measuring device based on singlechip

Technical Field

The utility model relates to a low-voltage apparatus and electronic information field, especially an inductance measurement device based on singlechip.

Background

At present, inductance measurement is based on a VCR law measurement principle, voltage at two ends of an inductor and current flowing through the inductor are measured respectively and calculated according to the VCR law, a traditional inductance measurement method mainly depends on manual measurement, measurement errors are easy to generate, efficiency is low, in the field of production, the measurement method with low efficiency and low accuracy hinders production of high-quality inductors, and a rapid and accurate inductance measurement mode is needed.

Disclosure of Invention

The utility model aims to solve the technical problem that a novel inductance measurement device based on singlechip is provided. The parallel resonance principle is adopted, the measured inductance Lx is measured and calculated, errors caused by manual reading are overcome, the measurement precision is high, the measured value can be displayed, the serial port communication function is achieved, and the applicability is very strong.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:

an inductance measuring device based on a single chip microcomputer comprises a test circuit and a control display circuit, wherein the test circuit comprises a measured inductance Lx, a fixed value resistor R1, an adjustable capacitor CP, a phase detector P, a loop switch K1, an indicator light and an alternating current power supply module to form a series resonance circuit or a parallel resonance circuit, a pole piece at one end of the adjustable capacitor CP is fixedly connected with a stay cord displacement sensor, the output ends of the stay cord displacement sensor and the phase detector P are electrically connected with the control display circuit, the control display circuit is provided with a communication interface and an LCD display module, through the resonance principle, when the phase detector P detects that the phase is zero, the voltage U and the current I at the circuit port are in the same phase, the circuit reaches a resonance state, at the moment, the capacitance size in the resonance state can be obtained through the distance of the capacitance pole piece measured by the stay cord displacement sensor, and meanwhile, the phase detector P outputs a signal to the, the inductance can be measured by the characteristics of the resonant circuit.

The test circuit structure is as follows: the detected inductor Lx, the constant value resistor R1, the adjustable capacitor CP, the alternating current power supply module, the loop switch K1, the indicator light and the phase detector P are sequentially connected in series to form a circuit loop, and a series resonance circuit is formed.

In a preferred embodiment, the test circuit structure is: the alternating current power supply module, the loop switch K1, the indicator light and the fixed value resistor R1 are sequentially connected in series to form a circuit loop, the phase detector P and the detected inductor Lx are connected in series and then connected in parallel with the fixed value resistor R1, and the two ends of the detected inductor Lx are connected in parallel with the adjustable capacitor CP to form a parallel resonance circuit.

The alternating current power supply module adopts 220V 50H provided by commercial power_ZThe inductance is calculated by using the known characteristic of the mains frequency fixation.

In a preferred scheme, the alternating current power supply module consists of a switching power supply and an inverter, and the error part of the frequency in the commercial power can be eliminated through the switching power supply and the inverter, so that the measurement result is more accurate.

The control unit of the control display circuit adopts a singlechip.

In the preferred scheme, the single chip microcomputer chip of the control display circuit control unit adopts STM32F103RCT6, the sensor output port of the pull rope displacement sensor is electrically connected with the PA0 end of the single chip microcomputer after passing through a divider resistor, the phase detector P is provided with a detector output interface, the detector output interface is connected with the PF0 end of the single chip microcomputer after passing through the divider resistor, the PA1 end of the single chip microcomputer is connected with a reset button, the single chip microcomputer PA2 and the PA3 end are connected with a communication interface, the PC0 end to the PC7 end are connected with an LCD display module, the distance between capacitor plates is measured through the pull rope displacement sensor, and the capacitance formula has: c_P= (A)/d；

In which the CPC is a tunable capacitor_PA is the area of the plate, d is the current capacitance C of the distance between the plates_PSize;

the resonance principle comprises the following steps: l is_x=1/（ω²C_P) Where ω is the supply frequency, the resulting measurement L_xThe values are:

L_x=d/（ω²A) and omega and A are known fixed values, d is a sensor measured value, and the inductance value in the resonance state can be calculated by the singlechip and is transmitted to the LCD display module to display the inductance.

The utility model provides a pair of inductance measurement device based on singlechip, inductance and power frequency and electric capacity relation between the size when resonance state can be obtained to characteristic under the resonance state through RLC circuit, use the big or small power of fixed frequency, measure and learn the electric capacity size, can obtain the inductance size, this device test inductance size convenient and fast, but the automatic generation inductance value shows, is applicable to the demarcation of teaching and factory production inductance.

Drawings

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a schematic diagram of the overall series resonance of the present invention;

FIG. 2 is a schematic diagram of the overall middle parallel resonance of the present invention;

fig. 3 is a schematic diagram of the connection of the single chip microcomputer.

In the figure: the device comprises a detected inductor Lx1, a fixed value resistor R12, an adjustable capacitor CP 3, a phase detector P4, a loop switch K15, an indicator light 6, a pull rope displacement sensor 7, a sensor output interface 8, an alternating current power supply module 9, a voltage division resistor 10, a test circuit 11, a control display circuit 12, a communication interface 14, a reset button 15, a control chip 16, a direct current power supply module 17, an LCD display module 18 and a detector output interface 19.

Detailed Description

As shown in fig. 1, 2 and 3, an inductance measuring device based on a single chip microcomputer comprises a test circuit and a control display circuit, wherein the test circuit comprises a measured inductance Lx1, a fixed value resistor R12, an adjustable capacitor CP 3, a phase detector P4, a loop switch K15, an indicator lamp 6 and an alternating current power supply module 9 to form a series resonance circuit or a parallel resonance circuit, a pole piece at one end of the adjustable capacitor CP 3 is fixedly connected with a stay cord displacement sensor 7, output ends of the stay cord displacement sensor 7 and the phase detector P4 are both electrically connected with the control display circuit, the control display circuit is provided with a communication interface 14 and an LCD display module 18, through the resonance principle, when the phase detector P4 detects that the phase is zero, the voltage U and the current I at a circuit port are in the same phase, the circuit reaches a resonance state, at this time, the distance of a capacitor pole piece measured by the stay cord displacement, the capacitance in the resonance state can be obtained, meanwhile, the phase detector P4 outputs a signal to the control display circuit to record the capacitance value at the moment, and the inductance can be measured by the resonance circuit characteristic.

The phase detector P4 is a commercially available product, such as a D70- ψ single-phase meter.

The string displacement sensor 7 is a commercially available product, for example, a string displacement sensor of ES02 model manufactured by chafford.

As shown in fig. 1, the test circuit structure is: the detected inductor Lx1, the constant value resistor R12, the adjustable capacitor CP 3, the alternating current power supply module 9, the loop switch K15, the indicator lamp 6 and the phase detector P4 are sequentially connected in series to form a circuit loop, and a series resonant circuit is formed.

As shown in fig. 2, in a preferred embodiment, the test circuit structure is: the alternating current power supply module 9, the loop switch K15, the indicator lamp 6 and the constant value resistor R12 are sequentially connected in series to form a circuit loop, the phase detector P4 and the detected inductor Lx1 are connected in series and then connected in parallel with the constant value resistor R12, and the two ends of the detected inductor Lx1 are connected in parallel with the adjustable capacitor CP 3 to form a parallel resonance circuit.

The alternating current power supply module 9 adopts 220V 50H provided by commercial power_ZThe inductance is calculated by using the known characteristic of the mains frequency fixation.

In a preferred scheme, the alternating current power supply module 9 is composed of a switching power supply and an inverter, and through the switching power supply and the inverter, an error part of frequency in commercial power can be eliminated through the inverter, so that a measurement result is more accurate.

The switching power supply is a commercial product, such as an SPS-500-24 type DC24V switching power supply.

The inverter is a commercial product, such as a ZDA50-24220L01 type DC24V/AC220V inverter which is well produced.

The control unit of the control display circuit adopts a singlechip.

In the preferred scheme, the single chip microcomputer chip of the control display circuit control unit adopts STM32F103RCT6, the sensor output port 8 of the pull rope displacement sensor 7 is electrically connected with the PA0 end of the single chip microcomputer after passing through a voltage dividing resistor 10, the phase detector P4 is provided with a detector output interface 19, the detector output interface 19 is connected with the PF0 end of the single chip microcomputer after passing through the voltage dividing resistor 10, the PA1 end of the single chip microcomputer is connected with a reset button 15, the single chip microcomputer PA2 and PA3 ends are connected with a communication interface 14, the PC0 end to PC7 end are connected with an LCD display module 18, the distance between capacitor electrode plates is measured through the pull rope displacement sensor 7, and the capacitance formula has: c_P= (A)/d；

In which the CPC is a tunable capacitor_PA is the area of the plate, d is the distance between the platesFront capacitor C_PSize;

L_x=d/（ω²A) wherein, ω and A are known fixed values, d is a measured value of the sensor, and the inductance value in the resonance state can be calculated by the singlechip and transmitted to the LCD display module 18 to display the inductance.

Claims

1. The utility model provides an inductance measurement device based on singlechip, characterized by: including test circuit and control display circuit, test circuit contains and is surveyed electric inductance Lx (1), definite value resistance R1 (2), adjustable capacitor CP (3), phase place detector P (4), loop switch K1 (5), serial resonance circuit or parallel resonance circuit are constituteed to pilot lamp (6) and alternating current power supply module (9), the one end pole piece and stay cord displacement sensor (7) fixed connection of adjustable capacitor CP (3), the output of stay cord displacement sensor (7) and phase place detector P (4) all is connected with control display circuit electricity, control display circuit is equipped with communication interface (14) and LCD display module (18).

2. The inductance measuring device based on the single chip microcomputer according to claim 1, wherein the test circuit structure is as follows: the circuit comprises a detected inductor Lx (1), a constant resistor R1 (2), an adjustable capacitor CP (3), an alternating current power supply module (9), a loop switch K1 (5), an indicator light (6) and a phase detector P (4) which are sequentially connected in series to form a circuit loop.

3. The inductance measuring device based on the single chip microcomputer according to claim 1, wherein the test circuit structure is as follows: the alternating current power supply module (9), the loop switch K1 (5), the indicator lamp (6) and the constant value resistor R1 (2) are sequentially connected in series to form a circuit loop, the phase detector P (4) and the detected inductor Lx (1) are connected in series and then connected in parallel with the constant value resistor R1 (2), and two ends of the detected inductor Lx (1) are connected in parallel with the adjustable capacitor CP (3).

4. The inductance measuring device based on the single chip microcomputer according to claim 2 or 3, wherein: the alternating current power supply module (9) adopts 220V 50H provided by commercial power_ZThe alternating current of (1).

5. The inductance measuring device based on the single chip microcomputer according to claim 2 or 3, wherein: the alternating current power supply module (9) is composed of a switching power supply and an inverter.

6. The inductance measuring device based on the single chip microcomputer according to claim 5, wherein: the control unit of the control display circuit adopts a single chip microcomputer, and the single chip microcomputer chip adopts STM32F103RCT 6.

7. The inductance measuring device based on the single chip microcomputer according to claim 6, wherein: sensor output port (8) of stay cord displacement sensor (7) pass through divider resistance (10) after and PA0 end electric connection with the singlechip, be equipped with detector output interface (19) on phase place detector P (4), detector output interface (19) link to each other with the PF0 end of singlechip after divider resistance (10), the PA1 end of singlechip is connected with reset button (15), communication interface (14) are connected to singlechip PA2, PA3 end, LCD display module (18) is connected to PC0 to PC7 end.