Electromagnetic field test circuit and device

Abstract

The utility model relates to an electromagnetic field test circuit and device, and the circuit comprises an electric field sensing unit which is used for sensing an electric field and outputting an electric field sensing signal; the magnetic field sensing unit is used for sensing a magnetic field and outputting a magnetic field sensing signal; the signal processing and switching unit is used for processing the electric field sensing signal or the magnetic field sensing signal and outputting a switched signal; the filtering unit is used for performing high-frequency low-pass filtering or low-frequency low-pass filtering on the switched signal and outputting a filtered signal; the control unit is used for controlling the signal processing and switching unit and the filtering unit to work and receiving the filtered signal; and the battery unit is used for supplying power to the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, the filtering unit and the control unit. The electromagnetic field testing device has the advantages of being simple in circuit structure and small in size, the portable power source is used for supplying power, the portability of the electromagnetic field testing device is improved, a worker can conveniently carry the device to field operation, and the electromagnetic field testing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic field strength detection technology, and in particular to an electromagnetic field testing circuit and device. Background Technology

[0002] Because nuclear power plant sites have numerous electric and magnetic fields, it is necessary to test the specific distribution of these fields during unit operation to ensure the safety of personnel and the normal operation of equipment. This is to prevent personnel from accidentally entering hazardous areas and to avoid interference with equipment from these fields. Traditional electromagnetic field testing devices are generally large and heavy, requiring on-site power. Furthermore, the large operating area of ​​the plant necessitates that personnel using traditional electromagnetic field testing devices not only carry these bulky and heavy devices but also consider power supply issues (occasionally requiring long-distance cabling). This results in a heavy workload and low efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an electromagnetic field testing circuit and device.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct an electromagnetic field testing circuit, which is used to monitor the electromagnetic field in a nuclear power plant area, and the circuit includes:

[0005] An electric field sensing unit is used to sense the electric field and output an electric field sensing signal.

[0006] A magnetic field sensing unit is used to sense magnetic fields and output magnetic field sensing signals.

[0007] A signal processing and switching unit is connected to the electric field sensing unit and the magnetic field sensing unit respectively, and is used to process the electric field sensing signal or the magnetic field sensing signal to output a switched signal, wherein the switched signal is a processed electric field sensing signal, a processed magnetic field sensing signal or an unprocessed electric field sensing signal.

[0008] A filtering unit, connected to the signal processing and switching unit, is used to perform high-frequency low-pass filtering or low-frequency low-pass filtering on the switched signal to output a filtered signal.

[0009] A control unit, connected to the signal processing and switching unit and the filtering unit respectively, is used to control the operation of the signal processing and switching unit and the filtering unit, and to receive the filtered signal; and

[0010] The battery unit is connected to the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, the filtering unit, and the control unit, respectively.

[0011] Preferably, the signal processing and switching unit includes:

[0012] An adjustable signal amplification unit is connected to the electric field sensing unit and the control unit respectively, and is used to amplify the received sensing signal to output the amplified signal;

[0013] A first signal selection unit is connected to the magnetic field sensing unit and the control unit respectively, and is used to output the magnetic field sensing signal through its first contact or second contact;

[0014] The second signal selection unit is connected to the first contact of the adjustable signal amplification unit, the control unit, and the first contact of the first signal selection unit, respectively, and is used to output the amplified signal or the magnetic field sensing signal.

[0015] The multiplication unit is connected to the second signal selection unit and the control unit respectively, and is used to perform multiplication operations on the amplified signal or the magnetic field sensing signal with a set multiplication coefficient to output the product signal;

[0016] An addition unit, connected to the multiplication unit, is used to perform an addition operation on the product signal and a set value to output a sum signal; and

[0017] The third signal selection unit is connected to the second contact of the addition unit, the filtering unit, the control unit, and the first signal selection unit, respectively, and is used to output the switched signal.

[0018] Preferably, the electromagnetic field testing circuit further includes:

[0019] The fourth signal selection unit is connected to the electric field sensing unit, the adjustable signal amplification unit and the control unit respectively, and is used to receive redundant sensing signals and input the electric field sensing signal or the redundant sensing signal to the adjustable signal amplification unit.

[0020] Preferably, the first to fourth signal selection units each include a signal selection switch;

[0021] The first signal selection unit includes a signal selection switch whose common contact is connected to the magnetic field sensing unit, a first contact is connected to the second signal selection unit, a second contact is connected to the third signal selection unit, and a control terminal is connected to the control unit;

[0022] The second signal selection unit includes a signal selection switch whose first contact is connected to the adjustable signal amplification unit, whose second contact is connected to the first signal selection unit, whose common contact is connected to the multiplication unit, and whose control terminal is connected to the control unit;

[0023] The third signal selection unit includes a signal selection switch whose first contact is connected to the addition unit, whose second contact is connected to the first signal selection unit, whose common contact is connected to the filtering unit, and whose control terminal is connected to the control unit;

[0024] The fourth signal selection unit includes a signal selection switch whose first contact is connected to the electric field sensing unit, whose second contact can be connected to the redundant sensing signal, whose common contact is connected to the adjustable signal amplification unit, and whose control terminal is connected to the control unit.

[0025] Preferably, the adjustable signal amplification unit includes:

[0026] A gain setting unit, connected to the control unit, is used to receive a gain setting command output by the control unit and output a gain signal; and

[0027] The first signal amplifier, connected to the fourth signal selection unit and the second signal selection unit, is used to receive the gain signal and output the amplified signal.

[0028] Preferably, the filtering unit includes:

[0029] A high-frequency low-pass filter is used to filter the received signal to output a first filtered signal.

[0030] A low-frequency low-pass filter is used to filter the received signal to output a second filtered signal.

[0031] The fifth signal selection unit, connected to the signal processing and switching unit, the high-frequency low-pass filter, the low-frequency low-pass filter, and the control unit respectively, is used to input the switched signal to the high-frequency low-pass filter or the low-frequency low-pass filter; and

[0032] The sixth signal selection unit is connected to the high-frequency low-pass filter, the low-frequency low-pass filter and the control unit respectively, and is used to input the first filtered signal or the second filtered signal to the control unit.

[0033] Preferably, the electric field sensing unit includes:

[0034] Electric field sensors; and

[0035] A second signal amplifier is connected to the electric field sensor and is used to amplify the sensing signal output by the electric field sensor in order to output the electric field sensing signal.

[0036] The magnetic field sensing unit includes:

[0037] Magnetic field sensor; and

[0038] A third signal amplifier, connected to the magnetic field sensor, is used to amplify the sensing signal output by the magnetic field sensor in order to output the magnetic field sensing signal.

[0039] Preferably, the battery cell comprises:

[0040] Battery pack;

[0041] A power management unit, connected to the battery pack, is used to manage the battery pack and output a regulated power supply;

[0042] The first voltage conversion unit is connected to the power management unit, the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, and the filtering unit respectively, and is used to output a first power supply that can supply power to the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, and the filtering unit;

[0043] The second voltage conversion unit is connected to the first voltage conversion unit and the control unit, and is used to connect to the first power supply and output a second power supply that can supply power to the control unit.

[0044] Preferably, the battery cell further includes:

[0045] A power supply control unit, connected to the power management unit, the first voltage conversion unit, and the control unit, is used to control whether the power management unit supplies power to the first voltage conversion unit.

[0046] This invention also provides an electromagnetic field testing device, which includes the electromagnetic field testing circuit described above.

[0047] The technical solution of this utility model, through the cooperation of a signal processing and switching unit, a filtering unit, and a control unit, allows the electric field sensing signal and the magnetic field sensing signal output by the electric field sensing unit and the magnetic field sensing unit to flow through different paths. This enables the sensing signals to be amplified and filtered in different ways according to actual needs, achieving the technical effect of multiple sensing signals sharing a single signal processing and switching unit and a filtering unit. This simplifies the hardware circuit and plays a positive role in reducing costs, circuit size, and weight. Furthermore, the battery unit powers each hardware unit, improving the convenience of the electromagnetic field testing device. This makes it easier for staff to carry the device to work on-site in the factory, reducing the workload of staff testing electromagnetic fields and improving the efficiency of electromagnetic field testing. Attached Figure Description

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0049] Figure 1This is a circuit structure block diagram of the electromagnetic field testing circuit in some embodiments of this utility model;

[0050] Figure 2 This is a circuit diagram of the electric field sensing unit in some embodiments of this utility model;

[0051] Figure 3 This is a circuit diagram of the magnetic field sensing unit in some embodiments of this utility model;

[0052] Figure 4 This is a circuit diagram of the adjustable signal amplification unit in some embodiments of this utility model;

[0053] Figure 5 This is a circuit diagram of the first signal selection unit in some embodiments of this utility model;

[0054] Figure 6 This is a circuit diagram of the second signal selection unit in some embodiments of this utility model;

[0055] Figure 7 This is a circuit diagram of the multiplication unit in some embodiments of this utility model;

[0056] Figure 8 This is a circuit diagram of the addition unit in some embodiments of this utility model;

[0057] Figure 9 This is a circuit diagram of the third signal selection unit in some embodiments of this utility model;

[0058] Figure 10 This is a circuit diagram of the fourth signal selection unit in some embodiments of this utility model;

[0059] Figure 11 This is a circuit diagram of a high-frequency low-pass filter in some embodiments of this utility model;

[0060] Figure 12 This is a circuit diagram of a low-frequency low-pass filter in some embodiments of this utility model;

[0061] Figure 13 This is a circuit diagram of the fifth signal selection unit in some embodiments of this utility model;

[0062] Figure 14 This is a circuit diagram of the sixth signal selection unit in some embodiments of this utility model;

[0063] Figure 15 This is a circuit diagram of the control unit in some embodiments of this utility model;

[0064] Figure 16 This is a circuit structure block diagram of the battery cell in some embodiments of this utility model;

[0065] Figure 17 This is a circuit diagram of the power management unit in some embodiments of this utility model;

[0066] Figure 18 This is a circuit diagram of the first voltage conversion unit in some embodiments of this utility model;

[0067] Figure 19 This is a circuit diagram of the second voltage conversion unit in some embodiments of this utility model;

[0068] Figure 20 This is a circuit diagram of the power supply control unit in some embodiments of this utility model.

[0069] Explanation of icon numbers:

[0070] Electric field sensing unit 1; electric field sensor 11; second signal amplifier 12; magnetic field sensing unit 2; magnetic field sensor 21; third signal amplifier 22; signal processing and switching unit 3; signal amplification unit 31; gain setting unit 311; first signal amplifier 312; first signal selection unit 32; second signal selection unit 33; multiplication unit 34; frequency generator 341; multiplier 342; adder unit 35; setting unit 351; adder 352; third signal selection unit 36; filtering unit 4; high-frequency low-pass filter 41; low-frequency low-pass filter 42; fifth signal selection unit 43; sixth signal selection unit 44; control unit 5; battery unit 6; battery pack 61; power management unit 62; first voltage conversion unit 63; second voltage conversion unit 64; power supply control unit 65; fourth signal selection unit 7. Detailed Implementation

[0071] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0072] In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "up," "down," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0073] This utility model embodiment provides a circuit structure block diagram of an electromagnetic field testing circuit. This electromagnetic field testing circuit is used in an electromagnetic field testing device. The circuit has the advantages of simple circuit structure and small size. Furthermore, it is powered by a mobile power source (i.e., battery unit 6), which helps to improve the portability of the electromagnetic field testing device and makes it convenient for staff to carry the electromagnetic field testing device to the nuclear power plant site to detect the distribution of magnetic and electric fields.

[0074] Please see Figure 1 The electromagnetic field testing circuit may include an electric field sensing unit 1, a magnetic field sensing unit 2, a signal processing and switching unit 3, a filtering unit 4, a control unit 5, and a battery unit 6.

[0075] The electric field sensing unit 1 is used to sense the electric field and output the electric field sensing signal.

[0076] In some embodiments, such as Figure 2 As shown, the electric field sensing unit 1 may include an electric field sensor 11 and a second signal amplifier 12.

[0077] The electric field sensor 11 can be an existing electric field sensor. The function of the electric field sensor 11 is to sense the electric field strength and output an electric field strength signal that can characterize the magnitude of the electric field strength.

[0078] Please see Figure 2 The second signal amplifier 12 is connected to the electric field sensor 11. The second signal amplifier 12 is used to amplify the sensing signal (i.e., electric field strength signal) output by the electric field sensor 11 to output the electric field sensing signal.

[0079] Furthermore, such as Figure 2 As shown, the second signal amplifier 12 may include a first operational amplifier U100, a first resistor R111, a second resistor R130, a third resistor R140, a fourth resistor R100, and a fifth resistor R120. The negative input terminal of the first operational amplifier U100 is connected to the negative terminal of the electric field sensor 11 via the first resistor R111 and the second resistor R130, and to the output terminal of the first operational amplifier U100 via the fourth resistor R100. The connection point of the first resistor R111 and the second resistor R130 is grounded. The positive input terminal of the first operational amplifier U100 is connected to the positive terminal of the electric field sensor 11 and is connected to ground via the third resistor R140. The output terminal of the first operational amplifier U100 is connected to the first terminal of the fifth resistor R120, and the second terminal of the fifth resistor R120 outputs the electric field sensing signal. The positive and negative power supply terminals of the second signal amplifier 12 are respectively connected to the positive and negative power supply output terminals of the first power supply of the battery unit 6.

[0080] Understandably, the first operational amplifier U100, the first resistor R111, the second resistor R130, the third resistor R140, and the fourth resistor R100 constitute a forward amplifier circuit capable of amplifying the voltage difference between the positive and negative terminals of the electric field sensor 11. The gain of this forward amplifier circuit can be adjusted by changing the values ​​of the first resistor R111 and the fourth resistor R100. The fifth resistor R120 limits the magnitude of the electric field sensing signal current, preventing damage to subsequent circuits connected to the electric field sensing signal due to overcurrent. Furthermore, the first operational amplifier U100 can be an AD8033 operational amplifier.

[0081] The magnetic field sensing unit 2 is used to sense the magnetic field and output the magnetic field sensing signal.

[0082] In some embodiments, such as Figure 3 As shown, the magnetic field sensing unit 2 may include a magnetic field sensor 21 and a third signal amplifier 22.

[0083] The magnetic field sensor 21 can be an existing magnetic field sensor. The function of the magnetic field sensor 21 is to sense the magnetic field strength and output a magnetic field strength signal that can characterize the magnitude of the magnetic field strength.

[0084] Please see Figure 3 The third signal amplifier 22 is connected to the magnetic field sensor 21. The third signal amplifier 22 is used to amplify the sensing signal (i.e. magnetic field strength signal) output by the magnetic field sensor 21 to output the magnetic field sensing signal.

[0085] Furthermore, such as Figure 3 As shown, the third signal amplifier 22 may include a second operational amplifier U200, a sixth resistor R210, a seventh resistor R200, an eighth resistor R220, and a ninth resistor R230. The negative input terminal of the second operational amplifier U200 is connected to ground via the sixth resistor R210, and the other input terminal is connected to the output terminal of the second operational amplifier U200 via the eighth resistor R220. The positive input terminal of the second operational amplifier U200 is connected to the output terminal of the magnetic field sensor 21 via the eighth resistor R220 to receive the magnetic field strength signal. The output terminal of the second operational amplifier U200 is connected to the first terminal of the ninth resistor R230, and the second terminal of the ninth resistor R230 outputs the magnetic field sensing signal. The positive and negative power supply terminals of the second operational amplifier U200 are respectively connected to the positive power supply output terminal and the neutral ground terminal of the first power supply.

[0086] Understandably, the second operational amplifier U200, the sixth resistor R210, the seventh resistor R200, the eighth resistor R220, and the ninth resistor R230 constitute a forward amplifier circuit capable of amplifying the magnetic field sensing signal. The gain of this forward amplifier circuit can be adjusted by changing the values ​​of the sixth resistor R210 and the seventh resistor R200. The ninth resistor R230 limits the magnitude of the magnetic field sensing signal current, preventing damage to subsequent circuits connected to the magnetic field sensing signal due to overcurrent. Furthermore, the second operational amplifier U200 can be an AD8033 operational amplifier.

[0087] Please see Figure 1 The signal processing and switching unit 3 is connected to the electric field sensing unit 1 and the magnetic field sensing unit 2, respectively. The signal processing and switching unit 3 is used to process the electric field sensing signal or the magnetic field sensing signal to output a switched signal VOUT1. The switched signal VOUT1 is the processed electric field sensing signal, the processed magnetic field sensing signal, or the unprocessed magnetic field sensing signal. It should be noted that the unprocessed magnetic field sensing signal refers to the magnetic field sensing signal directly output by the magnetic field sensing unit 2 without being processed by the signal processing and switching unit 3.

[0088] In some embodiments, such as Figure 1 As shown, the signal processing and switching unit 3 may include an adjustable signal amplification unit 31, a first signal selection unit 32, a second signal selection unit 33, a multiplication unit 34, an addition unit 35, and a third signal selection unit 36.

[0089] Please see Figure 1 The adjustable signal amplification unit 31 is connected to the electric field sensing unit 1 and the control unit 5, respectively. The adjustable signal amplification unit 31 is used to amplify the received sensing signal (i.e., the electric field sensing signal or the redundant sensing signal) to output the amplified signal VAE1. Specifically, the control unit 5 is also used to output a gain setting command to control the gain of the adjustable signal amplification unit 31. The adjustable signal amplification unit 31 can amplify the received sensing signal according to the gain setting command to obtain the amplified signal VAE1.

[0090] In some embodiments, such as Figure 4 As shown, the adjustable signal amplification unit 31 may include a gain setting unit 311 and a first signal amplifier 312.

[0091] Please see Figure 4 The gain setting unit 311 is connected to the control unit 5. The gain setting unit 311 is used to receive the gain setting command output by the control unit 5 and output the gain signal according to the gain setting command.

[0092] Furthermore, such as Figure 4As shown, the gain setting unit 311 may include a first multiplexer U12, a tenth resistor R12, and an eleventh resistor R13. The control terminals of the first multiplexer U12 (including pins 10 and 11 of the first multiplexer U12) are connected to the control unit 5 to receive the gain setting command. The first contact of the first multiplexer U12 (i.e., pin 15 of the first multiplexer U12) is connected to ground via the tenth resistor R12. The second contact of the first multiplexer U12 (i.e., pin 14 of the first multiplexer U12) is connected to ground via the eleventh resistor R13. The common contact of the first multiplexer U12 (i.e., pin 3 of the first multiplexer U12) outputs the gain signal to the first signal amplifier 312.

[0093] In this embodiment, the first multiplexer U12 can be a multiplexer of model MAX4581. Understandably, the control unit 5 can control the level of pins 10 and 11 of the first multiplexer U12 by outputting a gain setting command, so as to control the common contact of the first multiplexer U12 to be connected with its first contact or second contact. Since the resistance values ​​of the tenth resistor R12 and the eleventh resistor R13 are different, this embodiment can use the resistance signals with different resistance values ​​as gain signals and input them into the first signal amplifier 312 to adjust the gain of the first signal amplifier 312.

[0094] Please see Figure 1 and Figure 4 The first signal amplifier 312 is connected to the electric field sensing unit 1 and the second signal selection unit 33 respectively. The first signal amplifier 312 is used to receive the gain signal and amplify the electric field sensing signal according to the gain signal to output the amplified signal VAE1.

[0095] Furthermore, such as Figure 4 As shown, the first signal amplifier 312 may include a third operational amplifier U11, a twelfth resistor R10, a thirteenth resistor R14, and a fourteenth resistor R11. The negative input terminal of the third operational amplifier U11 is connected to the common contact of the first multiplexer U12 and is connected to the output terminal of the third operational amplifier U11 via the twelfth resistor R10. The positive input terminal of the third operational amplifier U11 is connected to the electric field sensing unit 1 to receive the electric field sensing signal and is connected to ground via the thirteenth resistor R14. The output terminal of the third operational amplifier U11 is connected to the first terminal of the fourteenth resistor R11, and the second terminal of the fourteenth resistor R11 outputs the amplified signal VAE1. The positive and negative power supply terminals of the third operational amplifier U11 are respectively connected to the positive and negative power supply output terminals of the first power supply.

[0096] In this embodiment, the third operational amplifier U11 can be an operational amplifier of model AD8001. Understandably, under the action of the gain setting unit 311, the negative input terminal of the third operational amplifier U11 will be connected to ground through the tenth resistor R12 or the eleventh resistor R13. That is, the third operational amplifier U11, the twelfth resistor R10 and the thirteenth resistor R14, and the tenth resistor R12 or the eleventh resistor R13 form a positive amplification circuit that can amplify the electric field sensing signal. The control unit 5 can control the negative input terminal of the third operational amplifier U11 to be connected to ground through the tenth resistor R12 or the eleventh resistor R13 by outputting a gain setting command, thereby controlling the gain of the positive amplification circuit.

[0097] Please see Figure 1 The common contact of the first signal selection unit 32 is connected to the magnetic field sensing unit 2, the first contact of the first signal selection unit 32 is connected to the second signal selection unit 33, the second contact of the first signal selection unit 32 is connected to the third signal selection unit 36, and the control terminal of the first signal selection unit 32 is connected to the control unit 5. The first signal selection unit 32 is used to output a magnetic field sensing signal to the second signal selection unit 33 through its first contact, or to output a magnetic field sensing signal to the third signal selection unit 36 ​​through its second contact, according to the control of the control unit 5.

[0098] Furthermore, such as Figure 5 As shown, the first signal selection unit 32 may include a first signal selection switch U14, wherein the first signal selection switch U14 may be a multiplexer of model TS5A3160. Please refer to [link to relevant documentation]. Figure 5 , Figure 6 and Figure 9 The common contact of the first signal selection switch U14 (i.e., pin 4 of the first signal selection switch U14) is connected to the magnetic field sensing unit 2 to receive the magnetic field sensing signal. The first contact of the first signal selection switch U14 (i.e., pin 3 of the first signal selection switch U14) is connected to the second signal selection unit 33. The second contact of the first signal selection switch U14 (i.e., pin 1 of the first signal selection switch U14) is connected to the third signal selection unit 36. The control terminal of the first signal selection switch U14 (i.e., pin 6 of the first signal selection switch U14) is connected to the control unit 5, so that the control unit 5 can control the common contact of the first signal selection switch U14 to be connected to its first contact or to its first contact by setting the level of the control terminal of the first signal selection switch U14.

[0099] Please see Figure 1The first contact of the second signal selection unit 33 is connected to the adjustable signal amplification unit 31, the second contact of the second signal selection unit 33 is connected to the first signal selection unit 32, the control terminal of the second signal selection unit 33 is connected to the control unit 5, and the second signal selection unit 33 is used to output the amplified signal VAE1 or the magnetic field sensing signal to the multiplication unit 34 according to the control of the control unit 5.

[0100] Furthermore, such as Figure 6 As shown, the second signal selection unit 33 may include a second signal selection switch U13, wherein the second signal selection switch U13 may be a multiplexer of model MAX4581. Please refer to... Figure 4 , Figure 5 , Figure 6 and Figure 7 The common contact of the second signal selection switch U13 (i.e., pin 3 of the second signal selection switch U13) is connected to the multiplier 342 included in the multiplication unit 34 to input the amplified signal VAE1 or the magnetic field sensing signal to the multiplier 342. The first contact of the second signal selection switch U13 (i.e., pin 15 of the second signal selection switch U13) is connected to the second end of the fourteenth resistor R11 included in the adjustable signal amplification unit 31 to receive the amplified signal VAE1. The second contact of the second signal selection switch U13 (i.e., pin 13 of the second signal selection switch U13) is connected to the first contact of the first signal selection switch U14 included in the first signal selection unit 32 to receive the magnetic field sensing signal when the common contact and the first contact of the first signal selection switch U14 are turned on. The control terminal of the second signal selection switch U13 (i.e., pin 10 of the second signal selection switch U13, and pins 9 and 11 of the second signal selection switch U13 are grounded) is connected to the control unit 5, so that the control unit 5 can control the common contact of the second signal selection switch U13 to be connected to its first contact or to its first contact by setting the level of the control terminal of the second signal selection switch U13.

[0101] Please see Figure 1 The multiplication unit 34 is connected to the second signal selection unit 33 and the control unit 5 respectively. The multiplication unit 34 is used to perform multiplication operation on the amplified signal VAE1 or magnetic field sensing signal from the second signal selection unit 33 and the set multiplication coefficient to output the product signal VINa.

[0102] Furthermore, such as Figure 7As shown, the multiplication unit 34 may include a frequency generator 341 and a multiplier 342. The frequency generator 341 is communicatively connected to the control unit 5 to output a specific frequency signal DDS_OUT according to the frequency control command output by the control unit 5. The multiplier 342 is connected to the frequency generator 341 and the second signal selection unit 33 respectively to determine the set product coefficient according to the frequency magnitude of the specific frequency signal DDS_OUT, and then calculate the product of the amplified signal VAE1 or the magnetic field sensing signal and the set product coefficient to obtain the product signal VINa. The frequency generator 341 can be any existing frequency generator, as long as it can output a controllable frequency signal according to the control of the control unit 5; no limitation is imposed here. The multiplier 342 can be any existing multiplier, as long as it can determine the product coefficient based on the frequency signal; no limitation is imposed here.

[0103] Please see Figure 1 The addition unit 35 is connected to the multiplication unit 34. The addition unit 35 is used to perform addition operation on the product signal VINa and the set value to output the sum signal VOUTa.

[0104] In some embodiments, such as Figure 8 As shown, the addition unit 35 may include a setting unit 351 for setting a set value, and an adder 352 connected to the addition unit 35 and the multiplication unit 34 for performing addition operations.

[0105] Furthermore, such as Figure 8 As shown, the setting unit 351 may include a fourth operational amplifier U15, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R19. The negative input terminal of the fourth operational amplifier U15 is connected to its output terminal via the fifteenth resistor R15. The positive input terminal of the fourth operational amplifier U15 is connected to the battery cell 6 and the second power supply via the sixteenth resistor R16, and to ground via the seventeenth resistor R19. In this embodiment, the fifteenth resistor R15 and the sixteenth resistor R16 form a voltage divider circuit capable of dividing the second power supply voltage and outputting a divided voltage signal to the fourth operational amplifier U15. The fourth operational amplifier U15 and the fifteenth resistor R15 form a voltage follower circuit, which can improve the stability of the divided voltage signal. When the resistance values ​​of the fifteenth resistor R15 and the sixteenth resistor R16 are equal, the set value is equal to 0.5 times the voltage amplitude of the second power supply. The fourth operational amplifier U15 may be an AD8033 operational amplifier.

[0106] Furthermore, such as Figure 8As shown, adder 352 may include a fifth operational amplifier U17, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R18, and a twenty-third resistor R17. The positive input terminal of the fifth operational amplifier U17 is connected to multiplier 342 via the twentieth resistor R20 to receive the product signal VINa, and the other terminal is connected to the output terminal of the fourth operational amplifier U15 via the twenty-first resistor R21 to receive the voltage divider signal (1.65V) following the voltage. The negative input terminal of the fifth operational amplifier U17 is connected to ground via the twenty-second resistor R18, and the other terminal is connected to the output terminal of the fifth operational amplifier U17 via the twenty-third resistor R17. The output terminal of the fifth operational amplifier U17 is connected to the third signal selection unit 36 ​​to input the sum signal VOUTa. The positive and negative power supply terminals of the fifth operational amplifier U17 are respectively connected to the positive and negative power supply output terminals of the first power supply.

[0107] In this embodiment, the fifth operational amplifier U17 can be an operational amplifier of model AD8033. The fifth operational amplifier U17, the twentieth resistor R20, the twenty-first resistor R21, the twenty-second resistor R18, and the twenty-third resistor R17 form an adder circuit capable of summing the product signal VINa with the voltage divider signal.

[0108] Please see Figure 1 The first contact of the third signal selection unit 36 ​​is connected to the addition unit 35, the second contact of the third signal selection unit 36 ​​is connected to the second contact of the second signal selection unit 33, the common contact of the third signal selection unit 36 ​​is connected to the filtering unit 4, and the control terminal of the third signal selection unit 36 ​​is connected to the control unit 5. The third signal selection unit 36 ​​is used to output the sum signal VOUTa or the magnetic field sensing signal (i.e., the signal VOUT1 after switching is the sum signal VOUTa or the magnetic field sensing signal) to the filtering unit 4 according to the control of the control unit 5.

[0109] Furthermore, such as Figure 9 As shown, the third signal selection unit 36 ​​may include a third signal selection switch U16, which may be a multiplexer of model TS5A3160. Please refer to [link to documentation]. Figure 5 , Figure 8 and Figure 9The common contact of the third signal selection switch U16 (i.e., pin 4 of the third signal selection switch U16) is connected to the filter unit 4 to input the switched signal VOUT1 to the filter unit 4. The first contact of the third signal selection switch U16 (i.e., pin 1 of the third signal selection switch U16) is connected to the output terminal of the fifth operational amplifier U17 included in the adder unit 35. The second contact of the third signal selection switch U16 (i.e., pin 3 of the third signal selection switch U16) is connected to the second contact of the first signal selection switch U14 included in the first signal selection unit 32, so that when the common contact of the first signal selection switch U14 is connected to its second contact, a magnetic field sensing signal is input. The control terminal of the third signal selection switch U16 (i.e., pin 6 of the third signal selection switch U16) is connected to the control unit 5, so that the control unit 5 can control the common contact of the third signal selection switch U16 to be connected to its first contact or to its first contact by setting the level of the control terminal of the third signal selection switch U16.

[0110] Please see Figure 1 The working principle of the signal processing and switching unit 3 is as follows: When the first contact of the second signal selection unit 33 is connected to the common contact and the first contact of the third signal selection unit 36 ​​is connected to the common contact, the amplified signal VAE1 is input to the multiplication unit 34, and then processed by the multiplication unit 34 and the addition unit 35. Finally, the signal VOUT1 output from the third signal selection unit 36 ​​corresponds to the "processed electric field sensing signal"; when the first contact of the first signal selection unit 32 is connected to the common contact, the second contact of the second signal selection unit 33 is connected to the common contact and the third signal selection unit 36 ​​is connected to the common contact, the amplified signal VAE1 is input to the multiplication unit 34, and then processed by the multiplication unit 34 and the addition unit 35, the signal VOUT1 output from the third signal selection unit 36 ​​corresponds to the "processed electric field sensing signal"; When the second contact of the signal selection unit 36 ​​is connected to the common contact, the magnetic field sensing signal VB1 is input to the multiplication unit 34, and then processed by the multiplication unit 34 and the addition unit 35. Finally, the signal VOUT1 output from the third signal selection unit 36 ​​corresponds to the "processed magnetic field sensing signal". When the second contact of the first signal selection unit 32 is connected to the common contact and the second contact of the second signal selection unit 33 is connected to the common contact, the magnetic field sensing signal VB1 is directly output from the third signal selection unit 36, and the signal VOUT1 corresponds to the "unprocessed magnetic field sensing signal".

[0111] In some embodiments, such as Figure 1 As shown, the electromagnetic field test circuit may also include a fourth signal selection unit 7.

[0112] The fourth signal selection unit 7 is connected to the electric field sensing unit 1 to receive the electric field sensing signal. The fourth signal selection unit 7 can also be connected to external devices or redundant sensors (such as redundant electric field sensing units) to receive redundant sensing signals. The fourth signal selection unit 7 is connected to the adjustable signal amplification unit 31 and the control unit 5. Under the control of the control unit 5, the fourth signal selection unit 7 is used to input the electric field sensing signal or redundant sensing signal to the adjustable signal amplification unit 31.

[0113] Furthermore, such as Figure 10 As shown, the fourth signal selection unit 7 may include a fourth signal selection switch U10. Please refer to [link / reference]. Figure 3 ,and Figure 10 The first contact of the fourth signal selection switch U10 (i.e., pin 13 of the fourth signal selection switch U10) is connected to the second end of the ninth resistor R230 included in the magnetic field sensing unit 2 to receive the magnetic field sensing signal. The second contact of the fourth signal selection switch U10 (i.e., pin 15 of the fourth signal selection switch U10) can be connected to an external device or a redundant sensor to receive redundant sensing signals. The common contact of the fourth signal selection switch U10 (i.e., pin 3 of the fourth signal selection switch U10) is connected to the positive input terminal of the third operational amplifier U11 included in the adjustable signal amplification unit 31. The control terminal of the fourth signal selection switch U10 (i.e., pin 10 of the fourth signal selection switch U10, and pins 9 and 11 of the fourth signal selection switch U10 are grounded) is connected to the control unit 5.

[0114] In this embodiment, due to the addition of a fourth signal selection unit 7, the positive input terminal of the third operational amplifier U11 is connected to the second terminal of the ninth resistor R230 via the common contact and the first contact of the fourth signal selection switch U10. Furthermore, the fourth signal selection switch U10 can be a multiplexer of model MAX4581. Understandably, the control unit 5 can control the common contact of the fourth signal selection switch U10 to conduct with its first or second contact by controlling the level of pin 10 of the fourth signal selection switch U10.

[0115] Please see Figure 1 The filtering unit 4 is connected to the signal processing and switching unit 3. The filtering unit 4 is used to perform high-frequency low-pass filtering or low-frequency low-pass filtering on the switched signal VOUT1 to output the filtered signal. The filtered signal is either the switched signal VOUT1 after high-frequency low-pass filtering or the switched signal VOUT1 after low-frequency low-pass filtering.

[0116] In some embodiments, such as Figure 1 As shown, the filtering unit 4 may include a high-frequency low-pass filter 41, a low-frequency low-pass filter 42, a fifth signal selection unit 43, and a sixth signal selection unit 44.

[0117] The high-frequency low-pass filter 41 is used to perform high-frequency low-pass filtering on the received signal to output the first filtered signal (i.e., the signal after switching signal VOUT1 is filtered by high-frequency low-pass).

[0118] Furthermore, such as Figure 11 As shown, the high-frequency low-pass filter 41 may include a sixth operational amplifier U20, a twenty-fourth resistor R22, a twenty-fifth resistor R23, a twenty-sixth resistor R25, a twenty-seventh resistor R24, a twenty-eighth resistor R26, a first capacitor C32, and a second capacitor C33. Please refer to... Figure 11 and Figure 13 The negative input terminal of the sixth operational amplifier U20 is connected to ground via resistor R22 (24th resistor) and to its output terminal via resistor R23 (25th resistor). The positive input terminal of the sixth operational amplifier U20 is connected to ground via capacitor C32 (1st capacitor) and to the fifth signal selection unit 43 via resistors R25 (26th resistor) and R24 (27th resistor). This allows the first filter signal VINH to be input when the common contact and first contact of the fifth signal selection unit 43 are closed. The output terminal of the sixth operational amplifier U20 is connected to the sixth signal selection unit 44 to input the first filtered signal VOUTH. The connection point between resistors R25 and R24 is connected to the output terminal of the sixth operational amplifier U20 via capacitor C33. The connection point between resistor R24 ​​and the fifth signal selection unit 43 is connected to ground via resistor R26 (28th resistor).

[0119] In this embodiment, the sixth operational amplifier U20 can be an operational amplifier of model AD8033. The sixth operational amplifier U20, the twenty-fourth resistor R22, the twenty-fifth resistor R23, the twenty-sixth resistor R25, the twenty-seventh resistor R24, and the second capacitor C33 form a high-frequency low-pass filter amplifier circuit capable of performing high-frequency low-pass filtering on the first signal to be filtered, VINH. The frequency band of the high-frequency low-pass filter can be adjusted by adjusting the capacitance value of the second capacitor C33.

[0120] The low-frequency low-pass filter 42 is used to perform low-frequency low-pass filtering on the received signal to output the second filtered signal (i.e., the signal after switching signal VOUT1 is filtered by low-frequency low-pass).

[0121] Furthermore, such as Figure 12As shown, the low-frequency low-pass filter 42 may include a low-frequency low-pass filter module M1. The input terminal of the low-frequency low-pass filter module M1 is connected to a fifth signal selection unit 43 so that when the common contact and the second contact of the fifth signal selection unit 43 are turned on, the second signal to be filtered, VINL, is input. The output terminal of the low-frequency low-pass filter module M1 is connected to a sixth signal selection unit 44 so that the second filtered signal, VOUTL, is input to the sixth signal selection unit 44. Please refer to [link to relevant documentation]. Figure 15 The control terminal of the low-frequency low-pass filter M1 is communicatively connected to the control unit 5, and the control unit 5 adjusts parameters such as the frequency band range and cutoff frequency. The low-frequency low-pass filter module M1 can be an existing digital low-pass filter, capable of setting the frequency band range and cutoff frequency according to the control signal output by the control unit 5, and filtering the second signal to be filtered, VINL; no specific limitations are imposed here.

[0122] Please see Figure 1 The common contact of the fifth signal selection unit 43 is connected to the signal processing and switching unit 3 to receive the switched signal VOUT. The first contact of the fifth signal selection unit 43 is connected to the high-frequency low-pass filter 41. The second contact of the fifth signal selection unit 43 is connected to the low-frequency low-pass filter 42. The control terminal of the fifth signal selection unit 43 is connected to the rear control unit 5 so that, under the control of the control unit 5, the switched signal VOUT1 is input to either the high-frequency low-pass filter 41 or the low-frequency low-pass filter 42.

[0123] Furthermore, such as Figure 13 As shown, the fifth signal selection unit 43 may include a fifth signal selection switch U19. The fifth signal selection switch U19 may be a multiplexer of model TS5A3160. Please refer to [link / reference]. Figure 9 , Figure 11 , Figure 12 and Figure 13The common contact of the fifth signal selection switch U19 (i.e., pin 4 of the fifth signal selection switch U19) is connected to the common contact of the third signal selection switch U16 to receive the switched signal VOUT1. The first contact of the fifth signal selection switch U19 (i.e., pin 1 of the fifth signal selection switch U19) is connected to the connection node of the twenty-seventh resistor R24 ​​and the twenty-eighth resistor R26, so that when the common contact of the fifth signal selection switch U19 is connected to the first contact, the first signal to be filtered, VINH, is input to the high-frequency low-pass filter 41. The second contact of the fifth signal selection switch U19 (i.e., pin 3 of the fifth signal selection switch U19) is connected to the input terminal of the low-frequency low-pass filter module M1, so that when the common contact of the fifth signal selection switch U19 is connected to the second contact, the second signal to be filtered, VINL, is input to the low-frequency low-pass filter module M1. The control terminal of the fifth signal selection switch U19 (i.e., pin 6 of the fifth signal selection switch U19) is connected to the control unit 5, so that the control unit 5 can control the common contact of the fifth signal selection switch U19 to be connected to its first contact or to its first contact by setting the level of the control terminal of the fifth signal selection switch U19.

[0124] Please see Figure 1 The first contact of the sixth signal selection unit 44 is connected to the high-frequency low-pass filter 41 to receive the first filtered signal VOUTH. The second contact of the sixth signal selection unit 44 is connected to the low-frequency low-pass filter 42 to receive the second filtered signal VOUTL. The common contact of the sixth signal selection unit 44 is connected to the high-frequency low-pass filter 41 to receive the first filtered signal VOUTH. The common contact and the control terminal of the sixth signal selection unit 44 are connected to the control unit 5 so that, under the control of the control unit 5, either the first filtered signal VOUTH or the second filtered signal VOUTL is input to the control unit 5.

[0125] Furthermore, such as Figure 14 As shown, the sixth signal selection unit 44 may include a sixth signal selection switch U18. The sixth signal selection switch U18 may be a multiplexer of model TS5A3160. Please refer to [link / reference]. Figure 11 , Figure 12 , Figure 14 and Figure 15The common contact of the sixth signal selection switch U18 (i.e., pin 4 of the sixth signal selection switch U18) is connected to the control unit 5 to input either the first filtered signal VOUTH or the second filtered signal VOUTL to the control unit 5. The first contact of the sixth signal selection switch U18 (i.e., pin 1 of the sixth signal selection switch U18) is connected to the output of the second operational amplifier U200 to receive the first filtered signal VOUTH output by the second operational amplifier U200 when the common contact of the sixth signal selection switch U18 is connected to the first contact. The second contact of the sixth signal selection switch U18 (i.e., pin 3 of the sixth signal selection switch U18) is connected to the output of the low-frequency low-pass filter module M1 to receive the second filtered signal VOUTL output by the low-frequency low-pass filter module M1 when the common contact of the sixth signal selection switch U18 is connected to the second contact. The control terminal (pin 6 of the sixth signal selection switch U18) is connected to the control unit 5. This allows the control unit 5 to control the common contact of the sixth signal selection switch U18 to conduct with its first contact by setting the level of the control terminal. This, in turn, controls the input of the first filtered signal VOUTH or the second filtered signal VOUTL to the control unit 5. Understandably, in this invention, the control unit 5 only needs a single ADC port to acquire electric field sensing signals, magnetic field sensing signals, and redundant sensing signals. This helps save ADC resources, reduces the hardware configuration of the control unit 5, and plays a positive role in reducing hardware costs.

[0126] Please see Figures 2 to 15 The control unit 5 is connected to the signal processing and switching unit 3 and the filtering unit 4 respectively. The control unit 5 is used to control the operation of the signal processing and switching unit 3 and the filtering unit 4, and to receive the filtered signal. Specifically, the control unit 5 can analyze and process the filtered signal to reconstruct the magnetic field or electric field strength. The specific analysis and processing process can refer to existing algorithms, which will not be shown or described in detail here.

[0127] Furthermore, the control unit 5 may include a processor MCU1 (including MCU1A and MCU1B), which may be an existing microprocessor or a single-chip microcomputer.

[0128] Please see Figure 1 The battery unit 6 is connected to the electric field sensing unit 1, the magnetic field sensing unit 2, the signal processing and switching unit 3, the filtering unit 4, and the control unit 5. The battery unit 6 is used to provide the power required for the operation of the electric field sensing unit 1, the magnetic field sensing unit 2, the signal processing and switching unit 3, the filtering unit 4, and the control unit 5.

[0129] In some embodiments, such as Figure 16As shown, the battery unit 6 may include a battery pack 61, a power management unit 62, a first voltage conversion unit 63, and a second voltage conversion unit 64.

[0130] The battery pack 61 may include several rechargeable lithium batteries, which may be connected in series, in parallel, or in a series-parallel configuration.

[0131] Please see Figure 16 The power management unit 62 is connected to the battery pack 61. The power management unit 62 is used to manage the battery pack 61 and output a regulated power supply.

[0132] Furthermore, such as Figure 17 As shown, the power management unit 62 may include a power management module PMI C, a thirtieth resistor R30, a PMOS transistor U22, a thirty-first resistor R29, and a thirty-second resistor R31. Please refer to [link to relevant documentation]. Figure 15 and Figure 17 The power management module (PMIC) connects to the battery pack 61, the first terminal of the 30th resistor R30, and the source of the PMOS transistor U22. The second terminal of the 30th resistor R30 and the gate of the PMOS transistor U22 are connected to the control unit 5. The drain of the PMOS transistor U22 is connected to ground via the 31st resistor R29 and the 32nd resistor R31. The connection point of the 31st resistor R29 and the 32nd resistor R31 is connected to the control unit 5. Understandably, when the control unit 5 controls the PMOS transistor U22 to conduct, the 31st resistor R29 and the 32nd resistor R31 effectively form a voltage divider circuit that can divide the output voltage of the battery pack 61. The voltage divider signal VBAT_ADC reflects the magnitude of the output voltage of the battery pack 61, preparing for the prevention of over-discharge of the battery pack 61. The output terminal of the power management module (PMIC) outputs a regulated power supply (i.e., 5V_OUT). The power management module (PMIC) can have an existing switching power supply built in to convert the output voltage of the battery pack 61 to obtain the regulated power supply. The power supply terminal of the power management module (PMIC) can be connected to an external power source (i.e., 5V_IN). When the power management module (PMIC) is connected to an external power source, it can use the external power source to charge the battery pack 61.

[0133] Please see Figure 16 The first voltage conversion unit 63 is connected to the power management unit 62, the electric field sensing unit 1, the magnetic field sensing unit 2, the signal processing and switching unit 3, and the filtering unit 4 respectively, and is used to output a first power supply that can supply power to the electric field sensing unit 1, the magnetic field sensing unit 2, the signal processing and switching unit 3, and the filtering unit 4.

[0134] Furthermore, such as Figure 18As shown, the first voltage conversion unit 63 may include a power module U24, a third capacitor C36, a fourth capacitor C37, a fifth capacitor C38, a sixth capacitor C39, a seventh capacitor C40, an eighth capacitor C41, a ninth capacitor C44, an eleventh capacitor C45, a twelfth capacitor C46, ​​a thirteenth capacitor C47, a fourteenth capacitor C48, a first inductor L10, a second inductor L11, a third inductor L12, and a fourth inductor L13. The power module U24 may be a power module of model B0505S-1WR3. For the connection relationship between the power module U24 and its peripheral electronic components, please refer to [reference needed]. Figure 18 This will not be elaborated further here. It should be noted that the network label for the positive power output terminal of the first power supply corresponds to +5V, the network label for the negative power output terminal of the first power supply corresponds to -5V, and the network label for the neutral ground terminal of the first power supply corresponds to GND.

[0135] Please see Figure 16 The second voltage conversion unit 64 is connected to the first voltage conversion unit 63 and the control unit 5 respectively. The second voltage conversion unit 64 is used to connect to the first power supply and output a second power supply that can supply power to the control unit 5.

[0136] Furthermore, such as Figure 19 As shown, the second voltage conversion unit 64 may include a voltage reference chip U23, a fifteenth capacitor C42, and a sixteenth capacitor C43. The voltage reference chip U23 may be a REF3333 voltage reference chip. The input terminal of the voltage reference chip U23 is connected to the positive power supply of the first power supply and is connected to ground via the fifteenth capacitor C42. The output terminal of the voltage reference chip U23 is connected to ground via the sixteenth capacitor C43 and is used to output the second power supply (network label corresponding to 3.3V).

[0137] In some embodiments, such as Figure 16 As shown, battery unit 6 may also include power supply control unit 65. Power supply control unit 65 is connected to power management unit 62, first voltage conversion unit 63 and control unit 5 respectively. Power supply control unit 65 is also controlled by control unit 5 to control whether power management unit 62 supplies power to first voltage conversion unit 63 according to actual conditions (such as when the output voltage of battery pack 61 is too low, to prevent battery pack 61 from over-discharging).

[0138] Furthermore, such as Figure 20 As shown, the power supply control unit 65 may include a first PMOS transistor Q10, a thirty-third resistor R32, a thirty-fourth resistor R28, a second PMOS transistor U21, and a thirty-fifth resistor R27. Please refer to [link / reference]. Figure 15 , Figure 17 , Figure 18 and Figure 20The gate of the first PMOS transistor Q10 is connected to the control unit 5 and is connected to the source and ground of the first PMOS transistor Q10 via the thirty-third resistor R32. The drain of the first PMOS transistor Q10 is connected to the gate of the second PMOS transistor U21 via the thirty-fourth resistor R28. The source of the second PMOS transistor U21 is connected to the output terminal of the power management module PMIC and is connected to the gate of the second PMOS transistor U21 via the thirty-fifth resistor R27. The drain of the second PMOS transistor U21 is connected to the input terminal of the power module U24 (i.e., the second pin of the power module U24). Understandably, when the control unit 5 outputs a high level to the gate of the first PMOS transistor Q10, the first PMOS transistor Q10 is turned on, causing the second PMOS transistor U21 to be turned off, resulting in no power input to the first voltage conversion unit 63, causing other circuits powered by the first voltage conversion unit 63 to lose power and stop operating; when the control unit 5 outputs a low level to the gate of the first PMOS transistor Q10, the first PMOS transistor Q10 is turned off, and under the pull-up action of the thirty-fifth resistor R27, the second PMOS transistor U21 is turned on, and the power management unit 62 supplies power to the first voltage conversion unit 63.

[0139] Understandably, this invention, through the cooperation of a signal processing and switching unit, a filtering unit, and a control unit, allows the electric field sensing signal and the magnetic field sensing signal output by the electric field sensing unit and the magnetic field sensing unit to flow through different paths. This enables the sensing signals to be amplified and filtered in different ways according to actual needs, achieving the technical effect of multiple sensing signals sharing a single signal processing and switching unit and a filtering unit. This simplifies the hardware circuit and plays a positive role in reducing costs, circuit size, and weight. Furthermore, this invention uses a battery unit to power each hardware unit (including the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, the filtering unit, and the control unit), improving the convenience of the electromagnetic field testing device. This makes it easier for staff to carry the device to work on-site in the factory area, reducing the workload of staff testing electromagnetic fields and improving the efficiency of electromagnetic field testing.

[0140] This utility model also provides an electromagnetic field testing device, including the electromagnetic field testing circuit provided in the embodiments of this utility model.

[0141] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An electromagnetic field test circuit applied to monitor electromagnetic fields in a nuclear power plant site, characterized by, The electromagnetic field testing circuit includes: An electric field sensing unit is used to sense the electric field and output an electric field sensing signal. A magnetic field sensing unit is used to sense magnetic fields and output magnetic field sensing signals. A signal processing and switching unit is connected to the electric field sensing unit and the magnetic field sensing unit respectively, and is used to process the electric field sensing signal or the magnetic field sensing signal to output a switched signal, wherein the switched signal is a processed electric field sensing signal, a processed magnetic field sensing signal or an unprocessed magnetic field sensing signal. A filtering unit, connected to the signal processing and switching unit, is used to perform high-frequency low-pass filtering or low-frequency low-pass filtering on the switched signal to output a filtered signal. A control unit, connected to the signal processing and switching unit and the filtering unit respectively, is used to control the operation of the signal processing and switching unit and the filtering unit, and to receive the filtered signal; and The battery unit is connected to the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, the filtering unit, and the control unit, respectively.

2. The electromagnetic field testing circuit according to claim 1, characterized in that, The signal processing and switching unit includes: An adjustable signal amplification unit is connected to the electric field sensing unit and the control unit respectively, and is used to amplify the received sensing signal to output the amplified signal; A first signal selection unit is connected to the magnetic field sensing unit and the control unit respectively, and is used to output the magnetic field sensing signal through its first contact or second contact; The second signal selection unit is connected to the first contact of the adjustable signal amplification unit, the control unit, and the first contact of the first signal selection unit, respectively, and is used to output the amplified signal or the magnetic field sensing signal. The multiplication unit is connected to the second signal selection unit and the control unit respectively, and is used to perform multiplication operations on the amplified signal or the magnetic field sensing signal with a set multiplication coefficient to output the product signal; An addition unit, connected to the multiplication unit, is used to perform an addition operation on the product signal and a set value to output a sum signal; and The third signal selection unit is connected to the second contact of the addition unit, the filtering unit, the control unit, and the first signal selection unit, respectively, and is used to output the switched signal.

3. The electromagnetic field testing circuit according to claim 2, characterized in that, The electromagnetic field testing circuit also includes: The fourth signal selection unit is connected to the electric field sensing unit, the adjustable signal amplification unit and the control unit respectively, and is used to receive redundant sensing signals and input the electric field sensing signal or the redundant sensing signal to the adjustable signal amplification unit.

4. The electromagnetic field testing circuit according to claim 3, characterized in that, The first to fourth signal selection units each include a signal selection switch; The first signal selection unit includes a signal selection switch whose common contact is connected to the magnetic field sensing unit, a first contact is connected to the second signal selection unit, a second contact is connected to the third signal selection unit, and a control terminal is connected to the control unit; The second signal selection unit includes a signal selection switch whose first contact is connected to the adjustable signal amplification unit, whose second contact is connected to the first signal selection unit, whose common contact is connected to the multiplication unit, and whose control terminal is connected to the control unit; The third signal selection unit includes a signal selection switch whose first contact is connected to the addition unit, whose second contact is connected to the first signal selection unit, whose common contact is connected to the filtering unit, and whose control terminal is connected to the control unit; The fourth signal selection unit includes a signal selection switch whose first contact is connected to the electric field sensing unit, whose second contact can be connected to the redundant sensing signal, whose common contact is connected to the adjustable signal amplification unit, and whose control terminal is connected to the control unit.

5. The electromagnetic field testing circuit according to claim 3, characterized in that, The adjustable signal amplification unit includes: A gain setting unit, connected to the control unit, is used to receive the gain setting command output by the control unit and output a gain signal; as well as The first signal amplifier, connected to the fourth signal selection unit and the second signal selection unit, is used to receive the gain signal and output the amplified signal.

6. The electromagnetic field testing circuit according to any one of claims 1 to 5, characterized in that, The filtering unit includes: A high-frequency low-pass filter is used to filter the received signal to output a first filtered signal. A low-frequency low-pass filter is used to filter the received signal to output a second filtered signal. The fifth signal selection unit, connected to the signal processing and switching unit, the high-frequency low-pass filter, the low-frequency low-pass filter, and the control unit respectively, is used to input the switched signal to the high-frequency low-pass filter or the low-frequency low-pass filter; and The sixth signal selection unit is connected to the high-frequency low-pass filter, the low-frequency low-pass filter, and the control unit, respectively, and is used to input the first filtered signal or the second filtered signal to the control unit.

7. The electromagnetic field testing circuit according to claim 6, characterized in that, The electric field sensing unit includes: Electric field sensors; and A second signal amplifier is connected to the electric field sensor and is used to amplify the sensing signal output by the electric field sensor in order to output the electric field sensing signal. The magnetic field sensing unit includes: Magnetic field sensor; and A third signal amplifier, connected to the magnetic field sensor, is used to amplify the sensing signal output by the magnetic field sensor in order to output the magnetic field sensing signal.

8. The electromagnetic field testing circuit according to claim 6, characterized in that, The battery cell includes: Battery pack; A power management unit, connected to the battery pack, is used to manage the battery pack and output a regulated power supply; The first voltage conversion unit is connected to the power management unit, the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, and the filtering unit respectively, and is used to output a first power supply that can supply power to the electric field sensing unit, the magnetic field sensing unit, the signal processing and switching unit, and the filtering unit; The second voltage conversion unit is connected to the first voltage conversion unit and the control unit, and is used to connect to the first power supply and output a second power supply that can supply power to the control unit.

9. The electromagnetic field testing circuit according to claim 8, characterized in that, The battery cell also includes: A power supply control unit, connected to the power management unit, the first voltage conversion unit, and the control unit, is used to control whether the power management unit supplies power to the first voltage conversion unit.

10. An electromagnetic field testing device, characterized in that, Includes the electromagnetic field testing circuit as described in any one of claims 1 to 9.

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