JP3223244U - Current detection module and current tester device - Google Patents

Abstract

A current detection module and a current tester device capable of measuring currents in different ranges and displaying current values at different scales and accuracy. A current detection module includes an annular shell, and a ferrite core, a first sensor element, and a second sensor element are disposed in the annular shell. The first sensor element and the second sensor element detect a magnetic field in the magnetic circuit formed by the ferrite core, and generate a first detection signal and a second detection signal, respectively. The current tester device includes a device body, and the current detection module is attached to the device body. The apparatus main body includes a switch unit, a monitor module, and a signal processing module. The signal processing module receives the first detection signal or the second detection signal and controls the monitor module to display the measurement value. Two different detection signals are used to measure different ranges of current to achieve high accuracy. [Selection] Figure 1

Description

  The present invention relates to a current detection module and a current tester device, and more particularly to a current detection module and a current tester device having a plurality of detection ranges.

  Current detection modules or current measurement devices are widely used in various fields. The current detection module includes a magnetic field sensor. The magnetic field sensor detects a magnetic field generated by the current, and outputs a detection signal corresponding to the current value. The output detection signal is further used for current value calculation processing.

  However, since the detection and measurement of current by the magnetic field sensor are limited to a predetermined range, the accuracy is limited. If the current value exceeds the specification of the current detection module or current measurement device, the device is not suitable for use and the user must search for other devices.

  The current detection module of the present invention includes an annular shell, a ferrite core, a first sensor element, and a second sensor element. The ferrite core, the first sensor element, and the second sensor element are provided in the annular shell. The first sensor element and the second sensor element detect a magnetic field penetrating the ferrite core and generate a first detection signal and a second detection signal.

  Since the annular shell surrounds the detection area, a current can be passed through the detection area. This current forms a magnetic field that penetrates the magnetic circuit set by the ferrite core. The first sensor element and the second sensor element each independently detect a magnetic field and generate a detection signal. The characteristics of the first sensor element and the second sensor element are different. That is, each sensor element responds to a different range of magnetic field, and the detection signal generated by each sensor element can correspond to a different range of current passing through the detection region. As a result, by selecting the appropriate detection signal and performing further transmission and processing, the user does not have to search for another current detection module or tester device, and there is a conventional current tester device or current detection module. Can solve the problem.

  The present invention also provides a current tester device including a current detection module and a device body. The apparatus main body has a storage space, a measurement end, and an operation interface. The current detection module is provided at the measurement end of the apparatus main body. The current detection module further includes a signal transmission processing unit. The signal transmission processing unit is provided in the annular shell and has an input end and an output end. The input end of the signal transmission processing unit is electrically connected to the first sensor element and the second sensor element, and the output end extends to the housing space of the apparatus main body. The apparatus main body further includes a switch unit and a monitor module. The switch unit has two input ends and one output end, and the two input ends are connected to the output end of the signal transmission processing unit to receive the first detection signal and the second detection signal. Yes. The switch unit conducts one of the two input terminals of the switch unit and the output terminal of the switch unit, and outputs an original detection signal from the output terminal.

  The signal processing module is electrically connected to the output end of the switch unit and the monitor module. The signal processing module receives the original detection signal from the switch unit, and controls the monitor module to display a current value corresponding to the original detection signal and a switching state of the switch unit.

  By operating the switch unit, the user can switch the original detection signal received by the signal processing module between the first detection signal and the second detection signal. The signal processing module then calculates a current value corresponding to the received detection signal, and displays the calculated current value on the monitor module. That is, by operating the switch unit, the current tester device can be used to measure different ranges of current, and can display current values with different scales and accuracy.

1 is an exploded view of a current detection module according to a first embodiment of the present invention. The top view of the electric current detection module of 2nd Embodiment of this invention. Sectional drawing of the electric current detection module of 3rd Embodiment of this invention. The perspective view of the electric current detection module of 4th Embodiment of this invention. The fragmentary sectional view which showed a part of current tester apparatus of 5th Embodiment of this invention in the cross section. The perspective view which shows a part of electric current tester apparatus of this invention. The other top view which shows a part of electric current tester apparatus of this invention. The block diagram of the electric current tester apparatus of this invention. The top view of the electric current tester apparatus of this invention.

  The present invention provides a current detection module 10 as shown in FIG. 1, and the current detection module 10 includes an annular shell 11, a ferrite core 12, a first sensor element 13, and a second sensor element 14. It is out. The ferrite core 12, the first sensor element 13, and the second sensor element 14 are provided in the annular shell 11. The first sensor element 13 and the second sensor element 14 detect a magnetic field penetrating the ferrite core 12. Accordingly, the first sensor element 13 generates a first detection signal, and the second sensor element 14 generates a second detection signal.

  A detection region 100 is formed in the center of the annular shell 11. A wire or cable that can be energized can pass through the detection region 100, and the first and second sensor elements 13 and 14 detect the magnetic field that passes through the ferrite core 12 and are proportional to the absolute value of the current to be measured. Each detection signal is generated.

  In the first embodiment of the present invention, the first sensor element 13 and the second sensor element 14 are Hall effect sensors having different specifications, and the first sensor element 13 and the second sensor element 14 have different ranges of magnetic fields. Designed to detect. For example, the first sensor element 13 can detect a magnetic field between 0 Gauss (G) and 100 G, and outputs a first detection signal between 0 volts (V) and 40 mV in proportion to the value of the magnetic field. . The second sensor element 14 can detect a magnetic field between 0 G and 1000 G, and outputs a second detection signal between 0 V and 40 mV in proportion to the value of the magnetic field.

  Further, depending on the ratio between the detection signal and the detected magnetic field, and the state of the ferrite core 12, the first detection signal generated by the first sensor element 13 is between 0A and 40A penetrating the detection region 100. Is used to measure the current to be measured with an accuracy of 0.01 A. The second detection signal generated by the second sensor element 14 is used to measure the current to be measured between 0 A and 400 A with an accuracy of 0.1 A. Therefore, when it is known that the current to be measured is around 100 A, the second detection signal may be selected as the output signal of the current to be measured. When the measured current is known to be around 10 A, or when higher accuracy is required, the first detection signal is output as the measured current. Therefore, the user can select the first detection signal or the second detection signal as an output signal according to the test environment and requirements.

  As shown in FIG. 2, in the second embodiment of the present invention, the first sensor element 13 is a first winding 13 having two first ends 131, and the second sensor element 14 has two second ends. The second winding 14 has 141. The first winding 13 and the second winding 14 are both wound around the ferrite core 12, and the number of turns is different between the first winding 13 and the second winding 14.

  The current detection module 10 having sensor elements such as the first winding 13 and the second winding 14 is used for detecting alternating current (AC). The first winding 13 and the second winding 14 generate an alternating first detection signal and a second detection signal caused by the measured current. Since the number of turns is different, the values of the first detection signal and the second detection signal have different ratios even when the current to be measured is the same, and the accuracy is different. More specifically, the first winding 13 having a smaller number of turns generates a low-accuracy detection signal with a larger current in accordance with the current to be measured, and the second winding having a larger number of turns than the first winding 13. The line generates a highly accurate detection signal that is smaller in current than the detection signal generated by the first winding 13 depending on the current to be measured.

  As shown in FIG. 3, in the third embodiment, the first winding 13 is wound around the ferrite core 12, and the second winding 14 is formed around the first winding 13 of the first winding 13. It is wound around the outside. Further, an insulating layer 15 is disposed between the first winding 13 and the second winding 14 in order to ensure insulation.

  In the present embodiment, as shown in FIG. 3, the current detection module 10 further includes a metal annular shell 16. The metal annular shell 16 is provided in the annular shell 11 and covers the ferrite core 12 in addition to the first winding 13 and the second winding 14. The metal annular shell 16 isolates the first winding 13 and the second winding 14 from the external noise signal.

  As shown in FIG. 1, the annular shell 11 of the current detection module 10 includes a first half shell 111 with a first accommodation space 1110 and a second half shell 112 with a second accommodation space 1120. The first half shell 111 has a first rotation end 1111 and a first connection end 1112, and the second half shell 112 has a second rotation end 1121 and a second connection end 1122. Yes. The second rotation end 1121 is rotatably connected to the first rotation end 1111. The ferrite core 12 includes a first semicircular core 121 provided in the first accommodation space 1110, and a second semicircular core 122 provided in the second accommodation space 1120. have. When the first half shell 111 and the second half shell 112 are closed, the first connection end 1112 of the first half shell 111 comes into contact with the second connection end 1122, so that the inside of the first half shell 111 The first semicircular core 121 and the second semicircular core 122 in the second half shell form a magnetic circuit. The magnetic circuit defines a range of magnetic flux generated by the current to be measured that passes through the center of the detection region 100.

  In the first embodiment in which the sensor element is a Hall effect sensor, the first sensor element 13 and the second sensor element 14 are disposed in the first accommodation space 1110. More specifically, the first sensor element 13 and the second sensor element 14 are arranged at one of two opposing end portions of the first semicircular core 121. Specifically, the sensor elements 13, 14 are first rotated so as to be positioned between the end of the first semicircular core 121 and the end of the second semicircular core 122. It is disposed near the end 1111 or the first connection end 1112. That is, the first sensor element 13 and the second sensor element 14 are arranged in the magnetic circuit formed by the ferrite core 12 in order to detect the magnetic flux in the magnetic circuit.

  Moreover, the current detection module 10 can also include two first sensor elements 13 and two sensor elements 14 as shown in FIG. In this case, the current detection module 10 has two sets of one first sensor element 13 and one second sensor element 14. One of the set of the first sensor element 13 and the second sensor element 14 is disposed near the first rotation end 1111 in the first accommodation space, and the other of the first sensor element 13 and the second sensor element 14 is arranged. The set is disposed near the first connection end 1112 in the first receiving space 1110. The two first sensor elements 13 commonly output the first detection signal, and the two second sensor elements 14 commonly output the second detection signal. By arranging the two first sensor elements and the two second sensor elements, more accurate first detection signal and second detection signal can be obtained.

  As shown in FIGS. 2 and 3, in the second embodiment in which the sensor elements are the first winding 13 and the second winding 14, the first winding 13 includes the first portion 132 and the second portion 133. Have. The first portion 132 of the first winding 13 is wound around the first semicircular core 121, and the second portion 133 of the first winding 13 is wound around the second semicircular core 122. It is wrapped around The second winding 14 also has a first portion 142 and a second portion 143. The first portion 142 of the second winding 14 is wound around the first semicircular core 121, and the second portion 143 of the second winding 14 is wound around the second semicircular core 122. It is wrapped around The first portion 132 and the second portion 133 of the first winding 13 are electrically connected to the same pole, and the same applies to the first portion 142 and the second portion 143 of the second winding 14. is there. By arranging the respective portions of the two windings in each semicircular core, the detection signal becomes independent of the exact position of the current to be measured in the detection region 100, so that the stability is improved.

  As shown in FIG. 2, the first portion 132 of the first winding 13 and the first portion 142 of the second winding 14 are separately wound around the first semicircular core 121. Yes. Further, the second portion 133 of the first winding 13 and the second portion 143 of the second winding 14 are separately wound around the second semicircular core 122.

  As shown in FIG. 3, in the third embodiment, the first portion 132 of the first winding 13 and the first portion 142 of the second winding 14 are the same as those of the first semicircular core 121. Wrapped in position. The first portion 132 of the first winding 13 is directly wound around the first semicircular core 121, and the first portion 142 of the second winding 14 is the first portion of the first winding 13. It is wound around the outer periphery of 132. Similarly, the second portion 133 of the first winding 13 and the second portion 143 of the second winding 14 are wound around the same position of the second semicircular core 122. The second portion 133 of the first winding 13 is directly wound around the second semicircular core 122, and the second portion 143 of the second winding 14 is the first portion of the first winding 13. It is wound around the outer periphery of 132.

  As shown in FIG. 4, in the fourth embodiment in which the first sensor element and the second sensor element are Hall effect sensors, the current detection module 10 further includes a signal transmission processing unit 17 and two signal output ports 18. Including. The signal transmission processing unit 17 has an input end 171 and an output end 172. The first sensor element and the second sensor element are electrically connected to the input end 171 of the signal transmission processing unit 17. The signal output port 18 is electrically connected to the output end 172 of the signal transmission processing unit 17. The signal output port 18 is connected to the first sensor element and the second sensor element via the signal transmission processing unit 17. The signal transmission processing unit 17 receives the first detection signal and the second detection signal, and outputs the first detection signal and the second detection signal before outputting the first detection signal and the second detection signal to the signal output port 18. Amplify and stabilize. The first detection signal and the second detection signal output from the signal output port 18 can be used for current measurement.

  In the fifth embodiment of the present invention, as shown in FIGS. 5 and 6, the current tester device includes a current detection module 10 and a device body 20. The apparatus body 20 further includes a storage space, a measurement end 201, and an operation interface 202. The apparatus main body 20 further includes a switch unit 21 and a monitor module 22, and the switch unit 21 and the monitor module 22 are disposed on the operation interface 202. The current detection module 10 is provided at the measurement end 201 of the apparatus main body 20 and attached to the apparatus main body 20. The annular shell 11 of the current detection module 10 is designed according to the overall appearance of the current tester device and the assembly structure with the device body 20. The signal transmission processing unit 17 is provided in the annular shell 11 and has an input end 171 and an output end 172. Referring to FIG. 7 together, the first sensor element 13 and the second sensor element 14 are electrically connected to the input end 171 of the signal transmission processing unit 17. Further, the output end 172 of the signal transmission processing unit 17 extends into the accommodation space of the apparatus main body 20 via the annular shell 11.

  On the other hand, in the embodiment in which the first sensor element 13 and the second sensor element 14 are respectively windings, the two first ends 131 of the first sensor element 13 and the two second ends 141 of the second sensor element 14 are used. Extends through the annular shell 11 into the receiving space of the device body 20 for further transmission.

  As shown in FIGS. 5 and 8, the apparatus main body 20 further includes a signal processing module 23 provided in the accommodation space of the apparatus main body 20. The switch unit 21 has two input ends and one output end. The two input ends of the switch unit 21 are electrically connected to the output end 172 of the signal transmission processing unit 17 in order to receive the first detection signal and the second detection signal. The switch unit 21 connects one of the two input terminals to the output terminal of the switch unit 21 according to the switching state, and outputs an original detection signal from the output terminal. That is, the original detection signal is either the first detection signal or the second detection signal. The signal processing module 23 is electrically connected to the output end of the switch unit 21 and the monitor module 22. The signal processing module 23 receives the original detection signal from the switch unit, and detects whether the original detection signal is the first detection signal or the second detection signal by detecting the switching state of the switch unit. In response to this, the signal processing module 23 appropriately processes the original detection signal and controls the monitor module 22 to display the measured value of the current to be measured.

  For example, when the switch unit 21 is in the first state, the switch unit 21 makes the first sensor element 13 and the signal processing module 23 conductive, and outputs a first detection signal to the signal processing module 23. When the switch unit 21 is in the second state, the switch unit 21 causes the second sensor element 14 and the signal processing module 23 to conduct and outputs a second detection signal to the signal processing module 23.

  As shown in FIG. 9, the user can operate the switch unit 21 to switch between the first state and the second state. By this switching operation, the original detection signal received by the signal processing module 23 is controlled. The switch unit 21 may be a mechanical switch or an electrical switch. The current tester device provides a current measurement function and can directly display the measured value. The first detection signal and the second detection signal can be used to measure different ranges of current. By switching the switch unit 21, the current tester device can be used to measure and provide different scale currents with different accuracy.

10: current detection module, 11: annular shell, 12: ferrite core, 13: first sensor element, 14: second sensor element, 20: apparatus main body.

Claims (3)

An annular shell;
A ferrite core provided in the annular shell;
A first sensor element provided in the annular shell and detecting a magnetic field in the ferrite core to generate a first detection signal;
A second sensor element provided in the annular shell and detecting the magnetic field in the ferrite core to generate a second detection signal;
The current detection module, wherein the first sensor element and the second sensor element have different characteristics. The first sensor element is a first winding having two first ends;
The second sensor element is a second winding having two second ends;
The current detection module according to claim 1, wherein the first winding and the second winding are wound around the ferrite core. A current tester device comprising a device body having a storage space, a measurement end and an operation interface,
The device body is
A switch unit provided in the operation interface and having two input ends and one output end;
A monitor module provided in the operation interface;
A signal processing module provided in the accommodation space of the apparatus main body,
The current tester device includes the current detection module according to claim 1 provided at the measurement end of the device main body,
The current detection module includes:
A signal transmission processing unit provided in the annular shell and having an input end and an output end;
The input end of the signal transmission processing unit is electrically connected to the first sensor element and the second sensor element, and the output end of the signal transmission processing unit is within the accommodation space of the apparatus body. Extending to
The two input terminals of the switch unit are connected to the output terminal of the signal transmission processing unit so as to receive the first detection signal and the second detection signal, and the switch unit is connected to the switch unit. One of the two input ends and the output end of the switch unit are electrically connected to output an original detection signal,
The signal processing module is electrically connected to the output end of the switch unit, receives the original detection signal, detects a switching state of the switch unit, and displays a test value accordingly. A current tester device for controlling the monitor module.

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