Current measuring device based on Hall effect

By using a Hall effect-based current measurement device and signal processing with Hall devices and operational amplifiers, the problems of cumbersome operation and limited measurement range of oscilloscopes are solved, achieving high accuracy and low cost current measurement.

CN223857298UActive Publication Date: 2026-01-30BEIJING ORIENTAL SHARP LASER TECH
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Patent Information

Application Number
CN202423185107.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2026-01-30
Estimated Expiration
2034-12-24

AI Technical Summary

Technical Problem

Existing oscilloscopes are cumbersome to operate in current measurement, have a limited measurement range, cannot display large current waveforms, and are not suitable for large-volume current measurement.

Method used

The current measurement device based on the Hall effect includes a Hall device, a power supply module, a signal processing module, a multi-level sampling circuit module, and a display module. The Hall device converts the current into a voltage signal, and the operational amplifier and multi-level sampling circuit amplify and process the signal. Finally, the processing chip calculates and displays the current value.

Benefits of technology

It achieves a wide measurement range, high measurement accuracy, simple operation and low cost of current measurement, and is suitable for large-scale current numerical measurement.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223857298U_ABST
Patent Text Reader

Abstract

The utility model discloses a current measuring device based on a Hall effect. The current measuring device comprises a Hall device, a power supply module, a signal processing module, a multi-gear sampling circuit module, a processing chip and a display module, the signal processing module transmits an amplified signal obtained after the voltage measurement value of the Hall device is processed by an operational amplifier to the multi-gear sampling circuit module and the processing chip; the multi-gear sampling circuit module comprises a plurality of groups of sampling circuits, each sampling circuit comprises an operational amplifier, each group of sampling circuit is provided with input resistors with different resistance values at the input end of the operational amplifier of the respective circuit, and amplified signals output by the sampling circuits are input to the processing chip for current calculation; the display module is connected with the processing chip and used for displaying current calculation results of the multiple sets of signals. Amplified signals input to the multi-gear sampling circuit module by the signal processing module are connected to one or more sets of sampling circuits. The power supply module comprises multiple groups of power voltage reduction modules and is used for outputting power supplies of different specifications.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to current measurement technical field, concretely relates to a current measurement device based on hall effect. BACKGROUND

[0002] In electronic equipment research and development, test, need to measure current, commonly used measuring tool is oscilloscope, reads the waveform and size of current on the oscilloscope screen.

[0003] When clamping current through oscilloscope, need to cooperate current clamp, still need to manually adjust the parameter of oscilloscope, it is troublesome to operate, lead to low measurement efficiency. And the display range of oscilloscope is limited, when the current amplitude exceeds certain size, oscilloscope cannot display current waveform, and is not suitable for the measurement of large quantities of current values. UTILITY MODEL CONTENT

[0004] The utility model provides a current measurement device based on hall effect for the deficiency of prior art, has wide measurement range, and simple operation, low cost.

[0005] The utility model realizes the purpose through the following technical scheme:

[0006] A current measurement device based on hall effect, including hall device, power module, signal processing module, multi-gear sampling circuit module, processing chip and display module, the signal processing module includes two operational amplifiers, the voltage measurement value of hall device is sent to the multi-gear sampling circuit module and the second operational amplifier after the amplification signal of first operational amplifier processing, and the amplification signal output to the processing chip for current calculation after the processing of second operational amplifier, the multi-gear sampling circuit module includes multiple sets of sampling circuits, and the sampling circuit includes operational amplifier, and each sampling circuit sets up the input resistance of different resistance in the operational amplifier input end of respective circuit, and the amplification signal output of sampling circuit is input to the processing chip for current calculation, the display module is connected processing chip and is used to display the current calculation result of multiple signals, the amplification signal of signal processing module input to the multi-gear sampling circuit module is accessed one or more sets of sampling circuits, the power module includes multiple sets of power down module, and is used to output different specifications of power supply for the power supply of hall device, signal processing module, multi-gear sampling circuit module, processing chip and display module.

[0007] Further, the signal processing module further includes a third operational amplifier, the input end of the third operational amplifier is connected to the output signal of the first operational amplifier, and the amplification signal of the third operational amplifier is output to the oscilloscope.

[0008] Further, the signal processing module circuit structure is as follows: the positive electrode of the voltage signal output by the Hall device is connected to one end of resistors R9, R10, R11, R12, and R15, respectively; the negative electrode of the voltage signal output by the Hall device is connected to one end of resistors R17, R18, R19, R20, and R22, respectively; resistors R9 and R17 are connected in series; resistors R10 and R18 are connected in series; resistors R11 and R19 are connected in series; resistors R12 and R20 are connected in series; the other end of resistor R15 is connected to one end of capacitor C14, one end of resistor R21, one end of resistor R13, and pin 3 of first operational amplifier N4, respectively; the other end of resistor R22 is connected to the other end of capacitor C14, the other end of resistor R21, one end of resistor R25, one end of capacitor C16, and pin 2 of first operational amplifier N4, respectively; the other end of resistor R13 is connected to digital ground; pin 7 and pin 4 of first operational amplifier N4 are connected to +12V power supply and -12V power supply, respectively; pin 8 and pin 1 of first operational amplifier N4 are connected to two fixed terminals of potentiometer PR1, respectively; the adjustable terminal of potentiometer PR1 is connected to +12V power supply; pin 6 of first operational amplifier N4 is connected to the other end of resistor R25, the other end of capacitor C16, one end of resistor R3, one end of resistor R4, and one end of resistor R16, respectively; the other end of resistor R3 outputs a signal to the multi-position sampling circuit module; the other end of resistor R4 is connected to the negative electrode of diode V2 and pin 3 of second operational amplifier U1A, respectively; pin 8 of second operational amplifier U1A is connected to +5V power supply; the positive electrode of diode V2 is connected to digital ground; pin 2 of second operational amplifier U1A is connected to one end of resistor R6 and one end of resistor R7, respectively; the other end of resistor R6 is connected to digital ground; the other end of resistor R7 is connected to +5V power supply; pin 4 and pin 1 of second operational amplifier U1A are connected to digital ground and one end of resistor R5, respectively; the other end of resistor R5 outputs a signal to the processing chip; the other end of resistor R16 is connected to one end of resistor R14 and pin 3 of third operational amplifier N5, respectively; the other end of resistor R14 is connected to digital ground; pin 7 and pin 4 of third operational amplifier N5 are connected to +12V power supply and -12V power supply, respectively; pin 8 and pin 1 of third operational amplifier N5 are connected to fixed terminals of potentiometer PR2, respectively; the adjustable terminal of potentiometer PR2 is connected to +12V power supply; pin 2 of third operational amplifier N5 is connected to one end of resistor R24, one end of capacitor C15, and one end of resistor R26, respectively; the other end of resistor R24 is connected to digital ground; the other end of resistor R26 is connected to the adjustable terminal and one fixed terminal of potentiometer PR3, respectively; one end of resistor R27 and one end of capacitor C18 are connected to the other fixed terminal of potentiometer PR2, respectively; pin 6 of third operational amplifier N5 is connected to the other end of capacitor C15 and the other end of resistor R27, respectively; the other end of capacitor C18 is connected to digital ground; the two ends of capacitor C18 output a signal to an oscilloscope; the models of first operational amplifier N4 and third operational amplifier N5 are OP27; second operational amplifier U1A is part of chip U1, and the model of chip U1 is TLE2142.

[0009] Further, the multi-gear sampling circuit module comprises three groups of sampling circuits, and the specific structure is as follows: the input end of the first sampling circuit is connected with one end of a resistor R31, the other end of the resistor R31 is respectively connected with the negative electrode of a diode V3 and the pin 5 of an operational amplifier U1B, the positive electrode of the diode V3 is connected with a digital ground, the pin 6 of the operational amplifier U1B is connected with one end of a resistor R33, the pin 7 of the operational amplifier U1B is connected with one end of a resistor R32 and the other end of the resistor R33, the other end of the resistor R32 is respectively connected with the negative electrode of a diode V4, one end of a capacitor C24 and an output signal to a processing chip, the other end of the capacitor C24 is connected with the positive electrode of the diode V4 and grounded; the output end of the second sampling circuit is connected with one end of a resistor R35, the other end of the resistor R35 is respectively connected with the negative electrode of a diode V5, one end of a resistor R34 and the pin 3 of an operational amplifier U4A, the positive electrode of the diode V5 is connected with the other end of the resistor R34 and a digital ground, the pin 8 and the pin 4 of the operational amplifier U4A are respectively connected with a +5V power supply and a digital ground, one end of a resistor R37 is connected with the pin 2 of the operational amplifier U4A, the pin 1 of the operational amplifier U4A is respectively connected with one end of a resistor R36 and the other end of the resistor R37, the other end of the resistor R36 is respectively connected with the negative electrode of a diode V6, one end of a capacitor C25 and an output signal to a processing chip, the positive electrode of the diode V6 is connected with the other end of the capacitor C25 and a digital ground; the output end of the third sampling circuit is connected with one end of a resistor R39, the other end of the resistor R39 is respectively connected with the negative electrode of a diode V7, one end of a resistor R38 and the pin 5 of an operational amplifier U4B, the positive electrode of the diode V7 is connected with the other end of the resistor R38 and a digital ground, one end of a resistor R41 is connected with the pin 6 of the operational amplifier U4B, the pin 7 of the operational amplifier U4A is respectively connected with one end of a resistor R40 and the other end of the resistor R41, the other end of the resistor R40 is respectively connected with the negative electrode of a diode V8, one end of a capacitor C26 and an output signal to a processing chip, the positive electrode of the diode V8 is connected with the other end of the capacitor C26 and a digital ground; the operational amplifier U1B is part of a chip U1, the model of the chip U1 is TLE2142, the operational amplifier U4A and the operational amplifier U4B form a chip U4, and the model of the chip U4 is TLE2142.

[0010] Further, the model of the processing chip is GD32F303.

[0011] Compared with the prior art, the utility model has the beneficial effect that:

[0012] The current measuring device based on the Hall effect has the characteristics of large measurement range, high measurement accuracy, simple operation and lower cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0014] Figure 1 It is a whole structure schematic diagram of the present application;

[0015] Figure 2 It is a power module circuit diagram of the embodiment of the present application;

[0016] Figure 3 It is a signal processing module circuit diagram of the embodiment of the present application;

[0017] Figure 4 It is a multi-gear sampling circuit module circuit diagram of the embodiment of the present application;

[0018] Figure 5 It is a processing chip circuit diagram of the embodiment of the present application. DETAILED DESCRIPTION

[0019] The exemplary embodiments of the present application will be described in detail with reference to the drawings. Although the exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be completely conveyed to those skilled in the art. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] The present application discloses a current measuring device based on Hall effect, as shown in Figure 1 The present application discloses a current measuring device based on Hall effect, as shown in

[0021] In use, the external power supply module is connected to supply power to the device, and the measurement object (cable with current passing through) is placed in the hollow of the Hall device. The Hall device converts the current value into a voltage value using the Hall effect, and inputs it to the signal processing module. The signal processing module outputs the amplified signal to the multi-gear sampling circuit module and the processing chip, respectively. The multi-gear sampling circuit module amplifies the input signal again and outputs it to the processing chip. The processing chip reads and converts the input voltage value, and finally calculates the current measurement value and outputs it to the display module for display.

[0022] As shown in Figure 2 the power supply module is composed of a plurality of different power supply voltage dividing modules, the specific model of the power supply voltage dividing module is selected according to the different voltage required by the circuit. In this embodiment, the power supply required by the signal processing module circuit is 12V and 5V, the power supply required by the multi-grade sampling circuit module is 5V, and the power supply required by the processing chip is 3.3V, so the power supply modules with rated output voltages of 12V, 5V and 3.3V respectively are selected to compose the power supply circuit.

[0023] As shown in Figure 3As shown, the signal processing module circuit takes an operational amplifier as the core to amplify the voltage signal from the Hall device. The specific circuit structure is: the positive pole of the voltage signal output by the Hall device is connected to one end of resistors R9, R10, R11, R12, and R15, respectively, the negative pole of the voltage signal output by the Hall device is connected to one end of resistors R17, R18, R19, R20, and R22, respectively, resistors R9 and R17 are connected in series, resistors R10 and R18 are connected in series, resistors R11 and R19 are connected in series, resistors R12 and R20 are connected in series, the other end of resistor R15 is connected to one end of capacitor C14, one end of resistor R21, one end of resistor R13, and pin 3 of the first operational amplifier N4, respectively, the other end of resistor R22 is connected to the other end of capacitor C14, the other end of resistor R21, one end of resistor R25, one end of capacitor C16, and pin 2 of the first operational amplifier N4, respectively, the other end of resistor R13 is connected to digital ground, pin 7 and pin 4 of the first operational amplifier N4 are connected to +12V power supply and -12V power supply, respectively, pin 8 and pin 1 of the first operational amplifier N4 are connected to the fixed end of potentiometer PR1, respectively, the adjustable end of potentiometer PR1 is connected to +12V power supply, pin 6 of the first operational amplifier N4 is connected to the other end of resistor R25, the other end of capacitor C16, one end of resistor R3, one end of resistor R4, and one end of resistor R16, respectively, the other end of resistor R3 outputs a signal IF to the multi-gear sampling circuit module, the other end of resistor R4 is connected to the negative pole of diode V2 and pin 3 of the second operational amplifier U1A, respectively, pin 8 of the second operational amplifier U1A is connected to +5V power supply, the positive pole of diode V2 is connected to digital ground, pin 2 of the second operational amplifier U1A is connected to one end of resistor R6 and one end of resistor R7, respectively, the other end of resistor R6 is connected to digital ground, the other end of resistor R7 is connected to +5V power supply, pin 4 and pin 1 of the second operational amplifier U1A are connected to digital ground and one end of resistor R5, respectively, the other end of resistor R5 outputs a signal CUTin to the processing chip, the other end of resistor R16 is connected to one end of resistor R14 and pin 3 of the third operational amplifier N5, respectively, the other end of resistor R14 is connected to digital ground, pin 7 and pin 4 of the third operational amplifier N5 are connected to +12V power supply and -12V power supply, respectively, pin 8 and pin 1 of the third operational amplifier N5 are connected to two fixed ends of potentiometer PR2, respectively, the adjustable end of potentiometer PR2 is connected to +12V power supply, pin 2 of the third operational amplifier N5 is connected to one end of resistor R24, one end of capacitor C15, and one end of resistor R26, respectively, the other end of resistor R24 is connected to digital ground, the other end of resistor R26 is connected to the adjustable end and one fixed end of potentiometer PR3, respectively, one end of resistor R27 and one end of capacitor C18 are connected to the other fixed end of potentiometer PR2, respectively, pin 6 of the third operational amplifier N5 is connected to the other end of capacitor C15 and the other end of resistor R27, respectively, the other end of capacitor C18 is connected to digital ground, and the two ends of capacitor C18 output a signal to an oscilloscope.

[0024] As Figure 4As shown, the multi-level sampling module circuit uses an operational amplifier as its core. Its function is to further process the measured voltage based on the signal processing circuit before inputting it to the microcontroller. This embodiment's multi-level sampling circuit consists of multiple operational amplifier circuits, each with a different input resistance (e.g., ...). Figure 4 (R34 and R38 in the R34 and R38) to achieve different measurement levels. The specific circuit structure is as follows: The multi-level sampling circuit module includes three sampling circuits. The input terminal IF signal of the first sampling circuit is connected to one end of resistor R31. The other end of resistor R31 is connected to the negative terminal of diode V3 and pin 5 of operational amplifier U1B. The positive terminal of diode V3 is connected to digital ground. Pin 6 of operational amplifier U1B is connected to one end of R33. Pin 7 of operational amplifier U1B is connected to one end of resistor R32 and the other end of resistor R33. The other end of resistor R32 is connected to the negative terminal of diode V4 and one end of capacitor C24, and outputs signal ADC0 to the processing chip. The other end of capacitor C24 is connected to the positive terminal of diode V4 and grounded. The output terminal IF signal of the second sampling circuit is connected to one end of resistor R35. The other end of resistor R35 is connected to the negative terminal of diode V5, one end of resistor R34, and pin 3 of operational amplifier U4A. The positive terminal of diode V5 is connected to the other end of resistor R34 and connected to digital ground. Pins 8 and 4 of operational amplifier U4A are connected to +5V power supply and digital ground, respectively. Pin 2 of operational amplifier U4A is connected to one end of resistor R37. Pin 1 of operational amplifier U4A is connected to one end of resistor R36 and the other end of resistor R37. The other end of resistor R36 is connected to the cathode of diode V6, one end of capacitor C25, and outputs signal ADC1 to the processing chip. The anode of diode V6 is connected to the other end of capacitor C25 and then to digital ground. The IF signal output of the third sampling circuit is connected to one end of resistor R39. The other end of resistor R39 is connected to the cathode of diode V7, one end of resistor R38, and pin 5 of operational amplifier U4B. The anode of diode V7 is connected to the other end of resistor R38 and then to digital ground. Pin 6 of operational amplifier U4B is connected to one end of resistor R41. Pin 7 of operational amplifier U4A is connected to one end of resistor R40 and the other end of resistor R41. The other end of resistor R40 is connected to the cathode of diode V8, one end of capacitor C26, and outputs signal ADC2 to the processing chip. The anode of diode V8 is connected to the other end of capacitor C26 and then to digital ground.

[0025] In this embodiment, the first operational amplifier N4 and the third operational amplifier N5 are of model OP27, the second operational amplifier U1A and the operational amplifier U1B are two parts of chip U1, the chip U1 model is TLE2142, and the operational amplifier U4A and the operational amplifier U4B are two parts of chip U4, the chip U4 model is TLE2142.

[0026] In practical application, the measurement range can be selected according to the estimated range of the current, and the same current can be measured by using each range respectively, and the final measurement results are compared to obtain the most accurate current measurement value, and the multi-range sampling circuit improves the accuracy of measurement. According to the actual use scene, a suitable numerical processing method can be selected to process a plurality of measurement results to obtain the final result.

[0027] The processing chip circuit is as shown in the figure, and the calculation part takes the single-chip microcomputer as the core. Figure 5 The single-chip microcomputer is of GD32F303 type, calculates the corresponding current size according to the voltage sampling values from the signal processing module and the multi-range sampling circuit module, and outputs the calculation current results of each group of signals to the display module. The ADC0, ADC1 and ADC2 signals output by the multi-range sampling circuit module are connected to the 10th, 11th and 12th pins of the processing chip respectively, and the CUTin signal output by the signal processing module is connected to the 29th pin of the processing chip.

[0028] The above describes the utility model in detail through examples, but the content is only exemplary embodiments of the utility model, and cannot be considered as limiting the implementation range of the utility model. The protection scope of the utility model is defined by the claims. Any similar technical solution that achieves the above technical effects, or any equivalent changes and improvements to the application scope, within the spirit and protection scope of the utility model, designed by the technical personnel in the art inspired by the technical solutions of the utility model, should still belong to the patent coverage protection scope of the utility model. It should be noted that, in order to clearly express, the description of the utility model omits the expression of some components and processes known to the skilled in the art which are not directly and obviously related to the protection scope of the utility model.

[0029] It should be noted that, in the description of the utility model, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For the skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. A current measuring device based on the Hall effect, characterized in that, The application relates to a multi-channel current sampling device, which comprises a Hall device, a power supply module, a signal processing module, a multi-grade sampling circuit module, a processing chip and a display module; the signal processing module comprises two operational amplifiers; the voltage measurement value of the Hall device is transmitted to the multi-grade sampling circuit module and a second operational amplifier after being processed by a first operational amplifier; the amplified signal processed by the second operational amplifier is output to the processing chip for current calculation; the multi-grade sampling circuit module comprises a plurality of groups of sampling circuits; the sampling circuit comprises an operational amplifier; each group of sampling circuits is provided with input resistors with different resistance values at the input end of the operational amplifier of the respective circuit; the amplified signal output by the sampling circuit is input to the processing chip for current calculation; the display module is connected with the processing chip and is used for displaying the current calculation results of the plurality of groups of signals; the amplified signal input to the multi-grade sampling circuit module of the signal processing module is connected with one or more groups of sampling circuits; the power supply module comprises a plurality of groups of power supply step-down modules and is used for outputting power supplies with different specifications to supply power to the Hall device, the signal processing module, the multi-grade sampling circuit module, the processing chip and the display module.

2. A Hall effect based current measurement device according to claim 1, wherein, The signal processing module further comprises a third operational amplifier; the input end of the third operational amplifier is connected with the output signal of the first operational amplifier; and the amplified signal of the third operational amplifier is output to an oscilloscope.

3. A Hall effect based current measurement device according to claim 2, wherein, The signal processing module circuit structure is as follows: the positive pole of the voltage signal output by the Hall device is connected with one end of resistors R9, R10, R11, R12 and R15 respectively, the negative pole of the voltage signal output by the Hall device is connected with one end of resistors R17, R18, R19, R20 and R22 respectively, the resistors R9 and R17 are connected in series, the resistors R10 and R18 are connected in series, the resistors R11 and R19 are connected in series, the resistors R12 and R20 are connected in series, the other end of the resistor R15 is connected with one end of a capacitor C14, one end of a resistor R21, one end of a resistor R13 and the 3-pin of a first operational amplifier N4 respectively, the other end of the resistor R22 is connected with the other end of the capacitor C14, the other end of the resistor R21, one end of a resistor R25, one end of a capacitor C16 and the 2-pin of the first operational amplifier N4 respectively, the other end of the resistor R13 is connected with the digital ground, the 7-pin and the 4-pin of the first operational amplifier N4 are connected with +12V power supply and -12V power supply respectively, the 8-pin and the 1-pin of the first operational amplifier N4 are connected with two fixed terminals of a potentiometer PR1 respectively, the adjustable terminal of the potentiometer PR1 is connected with +12V power supply, the 6-pin of the first operational amplifier N4 is connected with the other end of the resistor R25, the other end of the capacitor C16, one end of a resistor R3, one end of a resistor R4 and one end of a resistor R16 respectively, the other end of the resistor R3 outputs a signal to the multi-position sampling circuit module, the other end of the resistor R4 is connected with the negative pole of a diode V2 and the 3-pin of a second operational amplifier U1A respectively, the 8-pin of the second operational amplifier U1A is connected with +5V power supply, the positive pole of the diode V2 is connected with the digital ground, the 2-pin of the second operational amplifier U1A is connected with one end of a resistor R6 and one end of a resistor R7 respectively, the other end of the resistor R6 is connected with the digital ground, the other end of the resistor R7 is connected with +5V power supply, the 4-pin and the 1-pin of the second operational amplifier U1A are connected with the digital ground and one end of a resistor R5 respectively, the other end of the resistor R5 outputs a signal to the processing chip, the other end of the resistor R16 is connected with one end of a resistor R14 and the 3-pin of a third operational amplifier N5 respectively, the other end of the resistor R14 is connected with the digital ground, the 7-pin and the 4-pin of the third operational amplifier N5 are connected with +12V power supply and -12V power supply respectively, the 8-pin and the 1-pin of the third operational amplifier N5 are connected with fixed terminals of a potentiometer PR2 respectively, the adjustable terminal of the potentiometer PR2 is connected with +12V power supply, the 2-pin of the third operational amplifier N5 is connected with one end of a resistor R24, one end of a capacitor C15 and one end of a resistor R26 respectively, the other end of the resistor R24 is connected with the digital ground, the other end of the resistor R26 is connected with the adjustable terminal and one fixed terminal of a potentiometer PR3 respectively, one end of a resistor R27 and one end of a capacitor C18 are connected with the other fixed terminal of the potentiometer PR2 respectively, the 6-pin of the third operational amplifier N5 is connected with the other end of the capacitor C15 and the other end of the resistor R27 respectively, the other end of the capacitor C18 is connected with the digital ground, the two ends of the capacitor C18 output a signal to an oscilloscope, the models of the first operational amplifier N4 and the third operational amplifier N5 are OP27, the second operational amplifier U1A is a part of a chip U1, and the model of the chip U1 is TLE2142.

4. A Hall-effect based current measurement device according to claim 3, wherein, The multi-gear sampling circuit module comprises three groups of sampling circuits, and the specific structure is as follows: the input end of the first sampling circuit is connected with one end of a resistor R31, the other end of the resistor R31 is respectively connected with the negative electrode of a diode V3 and the pin 5 of an operational amplifier U1B, the positive electrode of the diode V3 is connected with a digital ground, the pin 6 of the operational amplifier U1B is connected with one end of a resistor R33, the pin 7 of the operational amplifier U1B is connected with one end of a resistor R32 and the other end of the resistor R33, the other end of the resistor R32 is respectively connected with the negative electrode of a diode V4, one end of a capacitor C24 and an output signal to a processing chip, the other end of the capacitor C24 is connected with the positive electrode of the diode V4 and grounded; the output end of the second sampling circuit is connected with one end of a resistor R35, the other end of the resistor R35 is respectively connected with the negative electrode of a diode V5, one end of a resistor R34 and the pin 3 of an operational amplifier U4A, the positive electrode of the diode V5 is connected with the other end of the resistor R34 and a digital ground, the pin 8 and the pin 4 of the operational amplifier U4A are respectively connected with a +5V power supply and a digital ground, the pin 2 of the operational amplifier U4A is connected with one end of a resistor R37, the pin 1 of the operational amplifier U4A is respectively connected with one end of a resistor R36 and the other end of the resistor R37, the other end of the resistor R36 is connected with the negative electrode of a diode V6, one end of a capacitor C25 and an output signal to a processing chip, the positive electrode of the diode V6 is connected with the other end of the capacitor C25 and a digital ground; the output end of the third sampling circuit is connected with one end of a resistor R39, the other end of the resistor R39 is respectively connected with the negative electrode of a diode V7, one end of a resistor R38 and the pin 5 of an operational amplifier U4B, the positive electrode of the diode V7 is connected with the other end of the resistor R38 and a digital ground, the pin 6 of the operational amplifier U4B is connected with one end of a resistor R41, the pin 7 of the operational amplifier U4A is respectively connected with one end of a resistor R40 and the other end of the resistor R41, the other end of the resistor R40 is connected with the negative electrode of a diode V8, one end of a capacitor C26 and an output signal to a processing chip, the positive electrode of the diode V8 is connected with the other end of the capacitor C26 and a digital ground; the operational amplifier U1B is part of a chip U1, the model of the chip U1 is TLE2142, the operational amplifier U4A and the operational amplifier U4B form a chip U4, and the model of the chip U4 is TLE2142.

5. A Hall effect based current measurement device as claimed in claim 1, wherein, The model of the processing chip is GD32F303.