TWI711827B - Current measurement system - Google Patents

Abstract

A current measurement system is configured to measure current signal at a current input terminal, the current measuring system includes a controlling unit, a voltage generating unit, a voltage amplifying unit, and a processing unit. The controlling unit outputs a control signal to the voltage generating unit. The voltage generating unit converts the current signal into different voltage signals. The voltage amplifying unit amplifies the voltage signal, and outputs to the processing unit. The processing unit converts the amplified voltage signal to obtain a corresponding current value. The current measuring system accurately measures currents of different magnitudes, and improves the accuracy of current detection.

Description

Current measurement system

This application relates to a current measurement technology, in particular to a current measurement system.

Generally, people refer to currents with a magnitude less than 1 microampere as microcurrents. In the imaging, medical, and nanotechnology fields, the current magnitude that needs to be detected can sometimes even reach the picoamp level.

However, the current current detection circuit mainly uses a current detection chip to measure the current. In practical applications, the current detection chip limits the accuracy of current detection to a certain extent.

In view of the foregoing, it is necessary to provide a current measurement system that can measure currents of different magnitudes and improve the accuracy of current detection.

An embodiment of the present application provides a current measurement system for measuring a current signal at a current input terminal. The current measurement system includes a control unit, a voltage generation unit, a voltage amplification unit, and a processing unit; the control unit is electrically connected to the The voltage generation unit, the control unit is used to output a control signal to the voltage generation unit; the voltage generation unit is electrically connected to the current input terminal, the voltage generation unit is used to according to the control signal The current signal is converted into a different voltage signal; The voltage amplifying unit is electrically connected to the voltage generating unit, and the voltage amplifying unit is configured to amplify the voltage signal by a preset coefficient, and output the amplified voltage signal to the processing unit; and The processing unit is electrically connected to the voltage amplifying unit, and the processing unit is configured to convert the amplified voltage signal to obtain a corresponding current value.

In the current measurement system provided by the embodiment of the present application, the control unit outputs a control signal to the voltage generating unit to control the voltage generating unit to convert the current signal into a different voltage signal, and the voltage is amplified by The unit amplifies the voltage signal by a preset coefficient, and the processing unit converts the amplified voltage signal to obtain a corresponding current value. Therefore, the current measurement system provided by the embodiment of the present application can measure currents of different magnitudes, which improves the accuracy of current detection.

100: Current measurement system

11: Current input terminal

12: Voltage generating unit

13: Voltage acquisition unit

14: Voltage amplification unit

15: Acquisition unit

16: control unit

20: processing unit

122-124: Switch control module

R1-R3: resistance

Q1-Q3: switch

FIG. 1 is a block diagram of a preferred embodiment of the current measurement system of this application.

Fig. 2 is a block diagram of another preferred embodiment of the current measurement system of the present application.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them.

Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative labor are within the protection scope of this application.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Please refer to FIG. 1. In a preferred embodiment of the present application, a current measurement system 100 can measure the current signal input from the current input terminal 11.

Specifically in the embodiment of the present application, the current measurement system 100 may include a voltage generating unit 12, a voltage obtaining unit 13, a voltage amplifying unit 14, a collecting unit 15, a control unit 16, and a processing unit 20.

In this embodiment, the voltage generating unit 12 is electrically connected to the current input terminal 11 and the control unit 16, to receive the current signal output by the current input terminal 11, and output according to the control unit 16 The control signal converts the current signal into a different voltage signal.

Further, the voltage obtaining unit 13 is electrically connected between the voltage generating unit 12 and the voltage amplifying unit 14, and the voltage obtaining unit 13 is configured to obtain a voltage signal from the voltage generating unit 12, and The obtained voltage signal is transmitted to the voltage amplifying unit 14.

Next, the voltage amplifying unit 14 is electrically connected between the voltage acquiring unit 13 and the collecting unit 15. The voltage amplifying unit 14 is used to amplify the voltage signal by a preset coefficient, and the amplified The voltage signal of is transmitted to the acquisition unit 15, and the acquisition unit 15 performs analog-to-digital conversion on the amplified voltage signal and transmits it to the processing unit 20.

The processing unit 20 is used to select the corresponding magnification according to the signal output by the acquisition unit 15 to obtain the corresponding current value.

In a preferred embodiment, the processing unit 20 may include a human-computer interaction platform and a computer.

Please refer to FIG. 2, the voltage generating unit 12 may include a plurality of switch control modules, and each of the switch control modules is electrically connected to the control unit 16. In this embodiment, the voltage The generating unit 12 only shows three switch control modules as an example for description. In other embodiments, the number of switch control modules in the voltage generating unit 12 may also be greater than three.

In this embodiment, the switch control module 122 includes a switch Q1 and a resistor R1, the switch control module 123 includes a switch Q2 and a resistor R2, and the switch control module 124 includes a switch Q3 and a resistor R3.

The first terminal of the switch Q1 is electrically connected to the control unit 16, the second terminal of the switch Q1 is electrically connected to the current input terminal 11, and the second terminal and the third terminal of the switch Q1 are electrically connected respectively. Connected to the first end and the second end of the resistor R1. Both the first end and the second end of the resistor R1 are electrically connected to the voltage acquisition unit 13. The first terminal of the switch Q2 is electrically connected to the control unit 16, and the second terminal and the third terminal of the switch Q2 are electrically connected to the first terminal and the second terminal of the resistor R2, respectively. The first end of the resistor R2 is electrically connected to the second end of the resistor R1, and both the first end and the second end of the resistor R2 are electrically connected to the voltage acquisition unit 13. The first terminal of the switch Q3 is electrically connected to the control unit 16, and the second terminal and the third terminal of the switch Q3 are electrically connected to the first terminal and the second terminal of the resistor R3, respectively. The first end of the resistor R3 is electrically connected to the second end of the resistor R2, and both the first end and the second end of the resistor R3 are electrically connected to the voltage acquisition unit 13.

In this embodiment, the switches Q1-Q3 are all field effect transistors. The first, second, and third ends of the switches Q1-Q3 correspond to the gate, drain, and source of the field effect transistor, respectively.

In one embodiment, the resistances of the resistors R1, R2, and R3 are all different. For example, the resistance of the resistor R1 is 0.1 ohm, the resistance of the resistor R2 is 0.01 ohm, and the resistance The resistance of R3 is 1 ohm.

The working principle of the current measurement system 100 of the present application will be described in detail below by taking FIG. 2 as an example.

When in use, the current input terminal 11 inputs a current signal, and the processing unit 20 will output a switching signal to the voltage generating unit 12 by the control unit 16 according to the initialized setting to obtain the current signal. Then, the processing unit 20 determines the magnitude of the current signal. If the processing unit 20 cannot determine the magnitude of the current signal, the processing unit 20 sends a command signal to the control according to the magnitude of the current signal. Unit 16, the control unit 16 will select a resistor (such as R1) corresponding to the magnitude of the current signal according to the command signal, and output a first level control signal to the switch corresponding to the resistor ( For example, the first terminal of the switch Q1), so that the switch (such as the switch Q1) is turned off, and at the same time, the second-level control signal is output to the first terminal of the switch Q2 and the switch Q3, so that the switch Q2 and switch Q3 are turned on. Therefore, the current signal generated by the current input terminal 11 only passes through the resistor R1. At this time, the voltage obtaining unit 13 will obtain the voltage signal across the resistor R1 and output the voltage signal to the voltage amplifying unit 14.

Then, the voltage amplifying unit 14 will amplify the voltage signal with a preset amplification factor A (for example, 1000 times), and transmit the amplified voltage signal to the collecting unit 15. The acquisition unit 15 performs analog-to-digital conversion on the amplified voltage signal and transmits it to the processing unit 20. At this time, the processing unit 20 will select the corresponding magnification according to the digital signal transmitted by the acquisition unit 15 to obtain the current value.

Since the resistance values of the resistors are all different, the processing unit 20 will correspondingly control the conduction state of the switches Q1-Q3 according to the magnitude of the current signal.

Similarly, the working principle of the control unit 16 controlling the current signal input from the current input terminal 11 to pass through the resistor R1 is the same as the working principle of passing other resistors, and will not be repeated here.

The above-mentioned current measurement system 100 generates different voltage signals by controlling the current signal to pass through resistances of different magnitudes, and also calculates the corresponding current value in the processing unit 20 according to the voltage signal. Therefore, the current measurement system 100 provided by the embodiment of the present application can measure currents of different magnitudes, which improves the accuracy of current detection.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced None should deviate from the spirit and scope of the technical solution of the present invention.

Those skilled in the art can also make other changes within the spirit of the present invention and apply it to the design of the present invention as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should all be included in the scope of protection claimed by the present invention.

In summary, this creation meets the requirements of an invention patent, and Yan filed a patent application in accordance with the law. However, the above-mentioned are only the preferred embodiments of this creation, and the scope of this creation is not limited to the above-mentioned embodiments. For those who are familiar with the technique of this case, equivalent modifications or changes made by the spirit of this creation are all Should be covered in the scope of the following patent applications.

100: Current measurement system

11: Current input terminal

12: Voltage generating unit

13: Voltage acquisition unit

14: Voltage amplification unit

15: Acquisition unit

16: control unit

20: processing unit

Claims (5)

A current measurement system for measuring a current signal at a current input terminal, wherein the current measurement system includes a control unit, a voltage generation unit, a voltage amplification unit, a collection unit, and a processing unit; the control unit is electrically connected to the A voltage generating unit, the control unit is used to output a control signal to the voltage generating unit; the voltage generating unit is electrically connected to the current input terminal, the voltage generating unit includes a plurality of switch control modules, each The switch control modules are all electrically connected to the control unit, and the plurality of switch control modules are used for converting the current signal into different voltage signals according to the control signal; wherein, each of the switch control modules is It includes a switch and a resistor. The first end of the switch is electrically connected to the control unit, the second end of the switch is electrically connected to the current input end, and the second and third ends of the switch are electrically connected to the voltage acquisition The two ends of the unit and the resistor are electrically connected in series between the resistors in each switch control module; the voltage amplifying unit is electrically connected to the switch control modules, and the voltage amplifying unit is used to connect The voltage signal is amplified by a preset coefficient, and the amplified voltage signal is output to the processing unit; the collection unit is electrically connected to the voltage amplifying unit, and the collection unit is used to convert the amplified voltage signal After performing analog-to-digital conversion, it is transmitted to the processing unit; and the processing unit is electrically connected to the acquisition unit, and the processing unit selects the corresponding magnification according to the signal output by the acquisition unit to obtain the corresponding current value. The current measurement system according to claim 1, wherein the current measurement system further includes a voltage acquisition unit that is electrically connected between the voltage generation unit and the voltage amplification unit, and the voltage acquisition unit The unit is used for transmitting the voltage signal of the voltage generating unit to the voltage amplifying unit. The current measurement system according to claim 1, wherein the switch is a field effect transistor. The current measurement system according to claim 3, wherein the first terminal, the second terminal and the third terminal of the switch correspond to the gate, the drain and the source of the field effect transistor, respectively. The current measurement system according to claim 1, wherein the processing unit includes a human-computer interaction platform and a computer.

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