Analysis circuit for impedance measurement

Abstract

The utility model discloses an analysis circuit for impedance measurement. The analysis circuit comprises a data processing unit, a signal source assembly and a measurement assembly, wherein the signal source assembly is provided with a first interface (HICUR) and a second interface (LOCUR); the measurement assembly is provided with a third interface (HIPOT) and a fourth interface (LOPOT); the signal source assembly and the measuring assembly are both in circuit connection with the data processing unit. The analysis circuit for impedance measurement provided by the utility model is fast in test speed and low in comprehensive cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circuit technical field especially relates to an analysis circuit for impedance measurement. BACKGROUND

[0002] In the field of electronic testing and analysis, impedance measurement is a basic and important test project. In the aspect of impedance analysis, there are problems such as slow response speed and high comprehensive cost in measurement, which is difficult to meet the needs of the rapid development of modern electronic industry. INVENTION CONTENTS

[0003] The utility model provides a kind of analysis circuit for impedance measurement.

[0004] The utility model provides an analysis circuit for impedance measurement, comprising data processing unit, signal source component with first interface (HI_CUR) and second interface (LO_CUR) and measurement component with third interface (HI_POT) and fourth interface (LO_POT);The signal source component, measurement component are all and data processing unit circuit connection.

[0005] Preferably, the data processing unit includes a power supply component and a processor component; the power supply component includes a circuit board connector module (15), a multi-pin power supply module (9), and a power supply monitoring module (13); the processor component includes a first processor module (10); the power supply monitoring module (13) is electrically connected between the circuit board connector module (15) and the multi-pin power supply module (9); the power supply monitoring module (13) is electrically connected to the first processor; the first processor module (10) is electrically connected to the circuit board connector module (15).

[0006] Preferably, the processor component further includes a calibration electrically erasable read-only memory module (14), a processor external clock signal module (12), and a temporary sensor module (11); the calibration electrically erasable read-only memory module (14), the processor external clock signal module (12), and the temporary sensor module (11) are all electrically connected to the first processor module (10).

[0007] Preferably, the signal source component further includes a direct digital frequency synthesizer (5), a first digital-to-analog conversion module (6), and an amplifier module (2); the direct digital frequency synthesizer (5) is electrically connected between the first processor and the amplifier module (2); the first analog-to-digital conversion module (6) is electrically connected between the first processor and the amplifier module (2); the amplifier module (2) is electrically connected to the first interface (HI_CUR).

[0008] Preferably, the measuring assembly further comprises a voltage measuring module (3) and a second analog-digital conversion module (7); the third interface (HI_POT) and the fourth interface (LO_POT) are electrically connected with the voltage measuring module (3); and the second analog-digital conversion module (7) is electrically connected between the voltage measuring module (3) and the first processor module (10).

[0009] Preferably, the measuring assembly further comprises a current measuring module (4) and a third analog-digital conversion module (8); the second interface (LO_CUR) is electrically connected with the current measuring module (4); and the third analog-digital conversion module (8) is electrically connected with the temporary sensor module (11).

[0010] The utility model provides an analysis circuit for impedance measurement, test speed is fast, and the comprehensive cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the analysis circuit for impedance measurement provided by the utility model;

[0012] Figure 2 It is Figure 1 A simplified schematic diagram. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in conjunction with the drawings in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belong to the range of protection of the utility model.

[0014] As Figures 1-2 Indicated, the analysis circuit for impedance measurement provided by the embodiment, including data processing unit, signal source assembly with first interface HI_CUR and second interface LO_CUR and measuring assembly with third interface HI_POT and fourth interface LO_POT, the signal source assembly, measuring assembly all and data processing unit circuit connection are connected. The first interface HI_CUR, second interface LO_CUR for the person skilled in the art can understand respectively to the measured piece exert current, third interface HI_POT and fourth interface LO_POT are used to measure the voltage of the measured piece, provide signal to the measured piece through signal source assembly, through measuring assembly, the voltage of measured is fed back to data processing unit, through data processing unit analysis processing, realize the fast, accurate measurement to inductance, capacitance and resistance element. The analysis circuit for impedance measurement provided by the embodiment, test speed is fast, and the comprehensive cost is low.

[0015] Further, the data processing unit comprises a power supply component and a processor component; the power supply component comprises a circuit board connector module 15, a multi-pin power supply module 9 and a power supply monitoring module 13; the processor component comprises a first processor module 10; the power supply monitoring module 13 is electrically connected between the circuit board connector module 15 and the multi-pin power supply module 9; the power supply monitoring module 13 is electrically connected with the first processor; the first processor module 10 is electrically connected with the circuit board connector module 15. Those skilled in the art can understand that the circuit board connector module 15, the multi-pin power supply module 9, the power supply monitoring module 13 and the first processor module 10 are all prior art and will not be repeated here. The first processor is FPGA (Field-Programmable Gate Array, Field Programmable Gate Array processor), the first processor module 10 sets parameters for the measurement component and processes the numerical results fed back by the measurement component. The external device powers on the pins related to the power supply monitoring module 13 through the circuit board connector module 15, and assigns different voltages to the multiple pins of each element in the first processor module 10.

[0016] Further, the processor component further comprises a calibration electrically erasable read-only memory module 14, a processor external clock signal module 12 and a temporary sensor module 11; the calibration electrically erasable read-only memory module 14, the processor external clock signal module 12 and the temporary sensor module 11 are all electrically connected with the first processor module 10. Those skilled in the art can understand that the first processor module 10 is built-in with the calibration electrically erasable read-only memory module 14, the processor external clock signal module 12 and the temporary sensor module 11.

[0017] Further, the signal source component further comprises a direct digital frequency synthesizer 5, a first digital-to-analog conversion module 6 and an amplifier module 2; the direct digital frequency synthesizer 5 is electrically connected between the first processor and the amplifier module 2; the first digital-to-analog conversion module 6 is electrically connected between the first processor and the amplifier module 2; the amplifier module 2 is electrically connected with the first interface HI_CUR. Those skilled in the art can understand that the direct digital frequency synthesizer 5 outputs a sine wave and a triangular wave signal, which is amplified and conditioned by the amplifier module 2, and then converted into an analog signal by the first digital-to-analog conversion module 6, and finally flows into the measured object through the first interface HI_CUR of the measurement component. The direct digital frequency synthesizer 5, the first digital-to-analog conversion module 6 and the amplifier module 2 are all prior art and will not be repeated here.

[0018] Further, the measurement component further comprises a voltage measurement module 3 and a second analog-digital conversion module 7; the third interface HI_POT and the fourth interface LO_POT are both electrically connected with the voltage measurement module 3; the second analog-digital conversion module 7 is electrically connected between the voltage measurement module 3 and the first processor module 10. Those skilled in the art can understand that the voltage measurement module 3 and the second analog-digital conversion module 7 are both prior art and will not be described here. The external voltage signal is input to the digital programmable gain instrument amplifier for amplification and conditioning. The output signal of the instrument amplifier is transmitted to the analog input port of the analog-digital converter. The analog-digital converter 7 converts the received analog voltage signal into a digital signal and outputs through a digital interface, completing the voltage measurement process.

[0019] Further, the measurement component further comprises a current measurement module 4 and a third analog-digital conversion module 8; the second interface LO_CUR is electrically connected with the current measurement module 4; the third analog-digital conversion module 8 is electrically connected with the temporary sensor module 11. Those skilled in the art can understand that the second interface LO_CUR of the four terminals 1 of the to-be-measured member outputs the actual current of the to-be-measured member. The input current signal is transmitted to the amplifier, and the I-V conversion circuit related to the operational amplifier is used to convert the current into voltage and preliminarily amplify. Then the signal is transmitted to the buffer amplifier for buffering and filtering conditioning operation, and the analog-digital conversion is performed through the analog-digital converter 8, completing the current measurement process.

[0020] Those skilled in the art can understand that, Figure 2 ZX is the to-be-measured member DUT with unknown impedance. When calculating the current passing through the to-be-measured member or the actual AC amplitude value passing through the to-be-measured member, the test gear must be matched with the protection resistor Rs. Figure 2 The left side of the dashed line is the connection relationship of the to-be-measured member DUT, which adopts a four-wire Kelvin structure, wherein HI_CUR and LO_CUR are used to apply current, and HI_POT and LO_POT are used to measure voltage. Figure 2 The right side of the dashed line is the circuit data acquisition module, which adopts a balanced bridge structure. The signal source Vs outputs current, and the branch in series with the 100-ohm resistor Rs is used for protecting the signal source channel. After the current flows to the to-be-measured member ZX, HPOT and LPOT generate an actual voltage difference value, which is output after being amplified by the amplifier A0. The transimpedance amplifier A1 is used to feed back the measured current value CUR, and the branch in series with the 10-ohm input protection resistor RIN is connected. The transimpedance amplifier A1 is connected to the inverting terminal of RIN and RTIA, and the connection point is controlled to be 0V. The measured current is equal to the set voltage amplitude divided by the sum of the resistances of RS, ZX and RIN.

[0021] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An analytical circuit for impedance measurement, characterized in that, It includes a data processing unit, a signal source component with a first interface (HI_CUR) and a second interface (LO_CUR), and a measurement component with a third interface (HI_POT) and a fourth interface (LO_POT); the signal source component and the measurement component are both circuit-connected to the data processing unit; The data processing unit includes a power supply component and a processor component; the power supply component includes a circuit board connector module (15), a multi-pin power supply module (9), and a power monitoring module (13); the processor component includes a first processor module (10); the power monitoring module (13) is electrically connected between the circuit board connector module (15) and the multi-pin power supply module (9); the power monitoring module (13) is electrically connected to the first processor; the first processor module (10) is electrically connected to the circuit board connector module (15); The processor assembly further includes a calibration electrically erasable read-only memory module (14), a processor external clock signal module (12), and a temporary sensor module (11); the calibration electrically erasable read-only memory module (14), the processor external clock signal module (12), and the temporary sensor module (11) are all electrically connected to the first processor module (10); The signal source component further includes a direct digital frequency synthesizer (5), a first digital-to-analog converter (6), and an amplifier module (2); the direct digital frequency synthesizer (5) is electrically connected between the first processor and the amplifier module (2); the first digital-to-analog converter (6) is electrically connected between the first processor and the amplifier module (2); the amplifier module (2) is electrically connected to the first interface (HI_CUR); The measurement component also includes a voltage measurement module (3) and a second analog-to-digital converter (7); the third interface (HI_POT) and the fourth interface (LO_POT) are both electrically connected to the voltage measurement module (3); the second analog-to-digital converter (7) is electrically connected between the voltage measurement module (3) and the first processor module (10).

2. The analysis circuit for impedance measurement as described in claim 1, characterized in that, The measurement component also includes a current measurement module (4) and a third analog-to-digital converter module (8); the second interface (LO_CUR) and the current measurement module (4) are electrically connected; the third analog-to-digital converter module (8) is electrically connected to the temporary sensor module (11).

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