Multi-point portable magnetic field intensity tester

Abstract

The invention belongs to the technical field of magnetic field testing, and discloses a multi-point portable magnetic field intensity tester, which comprises a plurality of groups of longitudinal detection modules and a plurality of groups of transverse detection modules, the plurality of groups of longitudinal detection modules are arranged in the longitudinal direction inside the magnetic field intensity tester, and the plurality of groups of transverse detection modules are arranged in the transverse direction inside the magnetic field intensity tester. The sensor is used for detecting the transverse magnetic field intensity of the strong magnetic field; the plurality of groups of transverse detection modules are arranged in the transverse direction inside the magnetic field intensity tester and are used for detecting the magnetic field intensity of the strong magnetic field in the longitudinal direction; and each group of longitudinal detection module and each group of transverse detection module respectively comprise two first Hall sensors which are oppositely arranged. According to the invention, magnetic field intensity measurement can be carried out on a plurality of point positions of an effective degaussing area of a high-intensity magnetic field, the plurality of point positions only need to be tested once, the probe does not need to be positioned, a structural member in the degaussing area does not need to be disassembled, professional requirements on an operator are avoided, and the test is simple. The method is very suitable for regular testing of degaussing field intensity by common users with magnetic field intensity monitoring requirements, and ensures degaussing reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of field strength testing, and in particular relates to a multi-point portable magnetic field strength tester. Background Art

[0002] Strong magnetic fields can be used to completely destroy data stored on magnetic storage media such as hard disks, magnetic tapes, and magnetic cards. Its working principle is to generate a strong instantaneous strong magnetic field to completely remove the directional identification signal on the magnetic storage medium, causing it to lose its data representation ability, thereby destroying the recorded data.

[0003] The magnetic field strength tester for strong magnetic fields is used to test the strength of the demagnetization field at 6 fixed points in the effective demagnetization area of ​​the strong magnetic field. At present, the magnetic field strength tester is mainly a fluxmeter, which includes the instrument body and the split probe. The instrument body is placed outside the magnetic field, and the split probe goes deep into the magnetic field. In order to determine the strength value of demagnetization in a strong magnetic field, it is necessary to test the magnetic field strength at 6 fixed points in the effective demagnetization area.

[0004] The existing technology requires testing six times, and the split probe needs to be positioned more accurately, that is, placed at the specified six fixed points. The direction and position deviations affect the measurement accuracy. In addition, the demagnetization area of ​​the strong magnetic field is generally sealed, and some structural parts need to be disassembled in order to extend the split probe into the effective demagnetization area. Therefore, the testing work of the magnetic field strength tester of the strong magnetic field has certain professional requirements for the operator, and the test is more cumbersome. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-point portable magnetic field strength tester to solve the problem that the testing work of the existing strong magnetic field magnetic field strength tester has certain professional requirements on the operator and the testing is relatively complicated.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a multi-point portable magnetic field strength tester, which comprises: a plurality of groups of longitudinal detection modules and a plurality of groups of transverse detection modules, wherein the plurality of groups of longitudinal detection modules are arranged in the longitudinal direction inside the magnetic field strength tester, and are used to detect the magnetic field strength of a strong magnetic field in the transverse direction; the plurality of groups of transverse detection modules are arranged in the transverse direction inside the magnetic field strength tester, and are used to detect the magnetic field strength of a strong magnetic field in the longitudinal direction; Each group of longitudinal detection modules and each group of transverse detection modules include two first Hall sensors that are arranged opposite to each other.

[0007] Preferably, the number of groups of the longitudinal detection modules is 3, and the number of groups of the transverse detection modules is 3.

[0008] Preferably, the magnetic field strength tester further comprises: a processor, and the multiple groups of longitudinal detection modules and the multiple groups of transverse detection modules are electrically connected to the processor.

[0009] Preferably, the magnetic field strength tester further comprises: a direction detection module, the direction detection module being used to detect the placement direction of the magnetic field strength tester in the strong magnetic field; The direction detection module includes: a second receiving circuit and a second Hall sensor, the second Hall sensor is arranged in an inclined state in the magnetic field strength tester, the signal output end of the second Hall sensor is electrically connected to the signal input end of the second receiving circuit, and the signal output end of the second receiving circuit is electrically connected to the IO port of the processor.

[0010] Preferably, each group of longitudinal detection modules and each group of transverse detection modules also include: two first receiving circuits, the signal input ends of the two first receiving circuits of each group are electrically connected to the signal output ends of the corresponding two first Hall sensors, and the signal output ends of the two first receiving circuits of each group are electrically connected to the IO port of the processor.

[0011] Preferably, each first receiving circuit comprises: a peak holding subcircuit and a signal amplifying subcircuit, the input end of the peak holding subcircuit is used as the signal input end of the first receiving circuit, and is electrically connected to the signal output end of the corresponding Hall sensor, and the output end of the peak holding subcircuit is electrically connected to the input end of the signal amplifying subcircuit; The output end of the signal amplifying sub-circuit is used as the signal output end of the first receiving circuit and is electrically connected to the IO port of the processor.

[0012] Preferably, the peak holding subcircuit comprises: an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; The positive input terminal of the operational amplifier U1 is used as the input terminal of the peak holding subcircuit, the negative input terminal of the operational amplifier U1 is electrically connected to the first terminal of the resistor R4, the second terminal of the resistor R4 is electrically connected to the first terminal of the resistor R3, the first terminal of the capacitor C2, the first terminal of the capacitor C3, the first terminal of the capacitor C4, the cathode of the diode D1 and the first terminal of the resistor R2, and the second terminal of the resistor R2 is used as the output terminal of the peak holding subcircuit; The output end of the operational amplifier U1 is electrically connected to the first end of the resistor R1, and the second end of the resistor R1 is electrically connected to the positive electrode of the diode D1; The positive electrode of the power supply of the operational amplifier U1 is electrically connected to the power supply and the first end of the capacitor C1 respectively; The negative power supply electrode of the operational amplifier U1, the second end of the capacitor C1, the second end of the resistor R3, the second end of the capacitor C2, the second end of the capacitor C3 and the second end of the capacitor C4 are all grounded.

[0013] Preferably, the signal amplification subcircuit comprises: an operational amplifier U2, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C5; The positive input terminal of the operational amplifier U2 is used as the input terminal of the signal amplification sub-circuit, and the negative input terminal of the operational amplifier U2 is electrically connected to the first terminal of the resistor R5 and the first terminal of the resistor R6 respectively; The output end of the operational amplifier U2 is electrically connected to the first end of the resistor R7 and the second end of the resistor R6 respectively, and the second end of the resistor R7 is electrically connected to the first end of the resistor R8 and the first end of the capacitor C5 respectively; The second end of the resistor R8 is used as the output end of the signal amplifying sub-circuit, and the second end of the resistor R5 and the second end of the capacitor C5 are both grounded.

[0014] Preferably, the magnetic field strength tester also includes: a power module, a display screen and a memory; the power module is used to provide working power for the processor, the display screen, the memory, multiple groups of longitudinal detection modules and multiple groups of transverse detection modules, and the display screen and the memory are both electrically connected to the processor.

[0015] Preferably, the power module comprises: a storage battery, a charging circuit, a power detector and a voltage conversion module; The charging circuit is used to charge the battery, the power detector is used to detect the remaining power of the battery, and the voltage conversion module is used to convert the output voltage of the battery into multiple voltage levels; The power detector is communicatively connected with the processor.

[0016] Beneficial effects: The present invention deploys multiple groups of longitudinal detection modules and multiple groups of transverse detection modules, and can test multiple points in the effective demagnetization area of ​​the strong magnetic field, and the magnetic field strength of multiple points and any direction only needs to be tested once, without the need to locate the probe or disassemble the demagnetization area structure, and the test is simple without professional requirements for the operator. It is very suitable for ordinary users with magnetic field detection needs to regularly test the demagnetization field strength to ensure the reliability of strong magnetic field demagnetization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1It is a circuit block diagram of a multi-point portable magnetic field strength tester provided by one embodiment of the present invention; Figure 2 It is a schematic diagram of the deployment positions of the first Hall sensor and the second Hall sensor of a multi-point portable magnetic field strength tester provided by an embodiment of the present invention; Figure 3 is a circuit schematic diagram of a first Hall sensor or a second Hall sensor provided in one embodiment of the present invention; Figure 4 is a schematic diagram of a peak holding subcircuit provided in one embodiment of the present invention; Figure 5 It is a schematic diagram of a signal amplification subcircuit provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0019] Figure 1 FIG. 1 is a circuit diagram of a portable multi-point portable strong magnetic field strength tester provided by an embodiment of the present invention. Figure 1 As shown, this embodiment provides a portable multi-point portable magnetic field strength tester, the magnetic field strength tester comprising: a plurality of groups of longitudinal detection modules and a plurality of groups of transverse detection modules, the plurality of groups of longitudinal detection modules are deployed in the longitudinal direction inside the magnetic field strength tester, and are used to detect the magnetic strength of the strong magnetic field in the transverse direction; the plurality of groups of transverse detection modules are deployed in the transverse direction inside the magnetic field strength tester, and are used to detect the magnetic strength of the strong magnetic field in the longitudinal direction; Each group of longitudinal detection modules and each group of transverse detection modules include two first Hall sensors that are arranged opposite to each other.

[0020] In this embodiment, each Hall sensor can detect the field strength of a point in the strong magnetic field. By deploying multiple groups of longitudinal detection modules and multiple groups of transverse detection modules, the magnetic field strength tester can detect the field strength of multiple points in the strong magnetic field at the same time, whether it is placed in the strong magnetic field horizontally or vertically; multiple points only need to be tested once, and there is no need to locate the probe or disassemble the demagnetization area structure. The test is simple without professional requirements for the operator. It is very suitable for ordinary users who need to measure strong magnetic fields to regularly measure the magnetic field strength and ensure the reliability of demagnetization.

[0021] In this embodiment, the number of groups of the longitudinal detection modules is 3, and the number of groups of the transverse detection modules is 3; the number of groups of the longitudinal detection modules and the transverse detection modules can be flexibly selected according to actual needs.

[0022] At this time, the longitudinal detection module has 6 first Hall sensors, and the transverse detection module has 6 first Hall sensors, and the deployment positions are as follows: Figure 2 As shown, three first Hall sensors (Y1, Y8, Y7) are deployed on one horizontal side, and three (Y3, Y4, Y5) are deployed on the other horizontal side, three first Hall sensors (X1, X2, X3) are deployed on one longitudinal side, and three first Hall sensors (X7, X6, X5) are deployed on the other longitudinal side; because six fixed points need to be detected in the effective demagnetization area of ​​the strong magnetic field, the magnetic field strength tester has six first Hall sensors in the horizontal direction and six first Hall sensors in the longitudinal direction, so that the field strength detection of the six fixed points can be realized.

[0023] exist Figure 2 The horizontal arrow and the vertical arrow in indicate the magnetic field direction of the strong magnetic field, and the signal receiving surface of the first Hall sensor remains perpendicular to the magnetic field direction.

[0024] As a further optimization of this embodiment, the magnetic field strength tester also includes: a processor, and the multiple groups of longitudinal detection modules and the multiple groups of lateral detection modules are electrically connected to the processor; wherein the processor adopts the STM32 single-chip microcomputer minimum system, and the STM32 single-chip microcomputer minimum system includes an STM32 single-chip microcomputer, a clock circuit, a reset circuit, etc. The STM32 single-chip microcomputer minimum system is a conventional circuit in this field, and its specific circuit is not described in detail in this embodiment.

[0025] As a further optimization of this embodiment, the magnetic field strength tester further includes: a direction detection module, the direction detection module is used to detect the placement direction of the magnetic field strength tester in the strong magnetic field; The direction detection module includes: a second receiving circuit and a second Hall sensor, the second Hall sensor is arranged in an inclined shape in the magnetic field strength tester, the signal output end of the second Hall sensor is electrically connected to the signal input end of the second receiving circuit, and the signal output end of the second receiving circuit is electrically connected to the IO port of the processor; wherein the second Hall sensor is arranged at a position such as Figure 2 As shown, Figure 2XY0 in the figure, at this time, the second Hall sensor is placed at an angle of 45° to capture negative pulses and indicate whether the magnetic field strength tester is placed in the wrong direction. The second receiving circuit has the same circuit structure as the first receiving circuit described below; the circuit structure of the first Hall sensor is also the same as the second Hall sensor. The circuit structure of the first Hall sensor and the second Hall sensor is as shown in Figure 3 As shown, it mainly includes a Hall chip U2_1, a resistor R12_1, a resistor R13_1, a resistor R4_1, a resistor R2_1, a resistor R3_1, a capacitor C1_1, and a capacitor C2_1. The IN1 pin of the Hall chip U2_1 is connected to a +12V power supply, and one pin of the resistor R3_1 serves as a signal output end of the first Hall sensor or a signal output end of the second Hall sensor. Among them, the Hall chip U2_1 converts the field strength signal into a voltage signal, and the functions of other resistors and capacitors are to shield the DC component of the voltage signal and provide a suitable reference voltage. The Hall sensor converts the demagnetization instantaneous field strength into an instantaneous voltage signal.

[0026] As a further optimization of this embodiment, each group of longitudinal detection modules and each group of transverse detection modules also include: two first receiving circuits, the signal input ends of the two first receiving circuits of each group are electrically connected to the signal output ends of the corresponding two first Hall sensors, and the signal output ends of the two first receiving circuits of each group are electrically connected to the IO port of the processor.

[0027] In this embodiment, each first receiving circuit includes: a peak holding subcircuit and a signal amplifying subcircuit, the input end of the peak holding subcircuit is used as the signal input end of the first receiving circuit of the path, and is electrically connected to the signal output end of the corresponding Hall sensor, and the output end of the peak holding subcircuit is electrically connected to the input end of the signal amplifying subcircuit; wherein the Hall sensor converts the instantaneous field strength of demagnetization into an instantaneous voltage signal, the peak holding subcircuit holds the peak value of the instantaneous voltage signal so that the subsequent circuit has sufficient time to process, and the signal amplifying subcircuit amplifies the peak value of the voltage signal to a suitable voltage range for single-chip AD sampling; The output end of the signal amplifying sub-circuit is used as the signal output end of the first receiving circuit and is electrically connected to the IO port of the processor.

[0028] As a further optimization of this embodiment, Figure 4 As shown, the peak holding subcircuit includes: an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, with the capacitors C2, C3 and C4 being used as peak holding capacitors; The positive input terminal of the operational amplifier U1 is used as the input terminal of the peak holding subcircuit, the negative input terminal of the operational amplifier U1 is electrically connected to the first terminal of the resistor R4, the second terminal of the resistor R4 is electrically connected to the first terminal of the resistor R3, the first terminal of the capacitor C2, the first terminal of the capacitor C3, the first terminal of the capacitor C4, the cathode of the diode D1 and the first terminal of the resistor R2, and the second terminal of the resistor R2 is used as the output terminal of the peak holding subcircuit; The output end of the operational amplifier U1 is electrically connected to the first end of the resistor R1, and the second end of the resistor R1 is electrically connected to the positive electrode of the diode D1; The positive electrode of the power supply of the operational amplifier U1 is electrically connected to the power supply and the first end of the capacitor C1 respectively; The negative power supply electrode of the operational amplifier U1, the second end of the capacitor C1, the second end of the resistor R3, the second end of the capacitor C2, the second end of the capacitor C3 and the second end of the capacitor C4 are all grounded.

[0029] In this embodiment, the Hall sensor converts the demagnetization instantaneous field strength into an instantaneous voltage signal OUT_1. The instantaneous voltage signal OUT_1 charges capacitors C2, C3 and C4 through the operational amplifier U1 and the diode D1. Due to the unidirectional conductivity of the diode, the signal on the peak holding capacitor can be maintained for a long time after the OUT_1 signal disappears. The significance of the peak holding subcircuit is that the demagnetization field strength exists for a very short time, and the short-time signal OUT_1 is converted into a long-time signal OUT_2, so that the subsequent circuit has sufficient time to process the signal.

[0030] As a further optimization of this embodiment, Figure 5 As shown, the signal amplification subcircuit includes: an operational amplifier U2, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C5; The positive input terminal of the operational amplifier U2 is used as the input terminal of the signal amplification sub-circuit, and the negative input terminal of the operational amplifier U2 is electrically connected to the first terminal of the resistor R5 and the first terminal of the resistor R6 respectively; The output end of the operational amplifier U2 is electrically connected to the first end of the resistor R7 and the second end of the resistor R6 respectively, and the second end of the resistor R7 is electrically connected to the first end of the resistor R8 and the first end of the capacitor C5 respectively; The second end of the resistor R8 is used as the output end of the signal amplifying sub-circuit, and the second end of the resistor R5 and the second end of the capacitor C5 are both grounded.

[0031] In this embodiment, the signal amplification sub-circuit amplifies the voltage signal OUT_2 to a suitable voltage range OUT_3 for sampling by the single chip AD.

[0032] As a further optimization of this embodiment, the magnetic field strength tester also includes: a power module, a display screen and a memory; the power module is used to provide working power for the processor, the display screen, the memory, multiple groups of longitudinal detection modules and multiple groups of transverse detection modules, and the display screen and the memory are both electrically connected to the processor.

[0033] Among them, the display screen is a touch screen, and the touch screen provides a human-computer interaction function; the memory stores manufacturer and user setting parameters and stores field strength detection records.

[0034] Wherein, the power module includes: a battery, a charging circuit, a power detector and a voltage conversion module; The charging circuit is used to charge the battery, the power detector is used to detect the remaining power of the battery, and the power detector is connected to the processor in communication; the power detector determines whether the battery power is sufficient. When the power is insufficient, the measurement accuracy will be reduced. Therefore, it is necessary to disable the field strength detection function of the system when the power is low; The voltage conversion module is used to convert the output voltage of the battery into multiple voltage levels. The output voltage of the battery is +3.0V~+4.2V. The multiple voltage levels include: +5V level, +12V level, +3.3V and +3V level; An electronic switch is connected in series between the 13 Hall sensors and the voltage conversion module. The electronic switch is controlled by a processor. After the field strength detection is successful, the electronic switch disconnects the power supply of the Hall sensor, saving most of the power consumption.

[0035] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A multi-point portable magnetic field strength tester, characterized in that: The magnetic field strength tester comprises: a plurality of groups of longitudinal detection modules and a plurality of groups of transverse detection modules, wherein the plurality of groups of longitudinal detection modules are arranged in the longitudinal direction inside the magnetic field strength tester, and are used to detect the magnetic field strength of the strong magnetic field in the transverse direction; the plurality of groups of transverse detection modules are arranged in the transverse direction inside the magnetic field strength tester, and are used to detect the magnetic field strength of the strong magnetic field in the longitudinal direction; Each group of longitudinal detection modules and each group of transverse detection modules include two first Hall sensors that are arranged opposite to each other.

2. The multi-point portable magnetic field strength tester according to claim 1, characterized in that: The number of groups of the longitudinal detection modules is 3, and the number of groups of the transverse detection modules is 3.

3. The multi-point portable magnetic field strength tester according to claim 1, characterized in that: The magnetic field strength tester further includes: a processor, and the multiple groups of longitudinal detection modules and the multiple groups of transverse detection modules are electrically connected to the processor.

4. The multi-point portable magnetic field strength tester according to claim 3, characterized in that: The magnetic field strength tester further comprises: a direction detection module, the direction detection module being used to detect the placement direction of the magnetic field strength tester in the strong magnetic field; The direction detection module includes: a second receiving circuit and a second Hall sensor, the second Hall sensor is arranged in an inclined state in the magnetic field strength tester, the signal output end of the second Hall sensor is electrically connected to the signal input end of the second receiving circuit, and the signal output end of the second receiving circuit is electrically connected to the IO port of the processor.

5. The multi-point portable magnetic field strength tester according to claim 3, characterized in that: Each group of longitudinal detection modules and each group of transverse detection modules also include: two first receiving circuits, the signal input ends of the two first receiving circuits of each group are electrically connected to the signal output ends of the corresponding two first Hall sensors, and the signal output ends of the two first receiving circuits of each group are electrically connected to the IO port of the processor.

6. The multi-point portable magnetic field strength tester according to claim 5, characterized in that: Each first receiving circuit includes: a peak holding subcircuit and a signal amplifying subcircuit, the input end of the peak holding subcircuit is used as the signal input end of the first receiving circuit, and is electrically connected to the signal output end of the corresponding Hall sensor, and the output end of the peak holding subcircuit is electrically connected to the input end of the signal amplifying subcircuit; The output end of the signal amplifying sub-circuit is used as the signal output end of the first receiving circuit and is electrically connected to the IO port of the processor.

7. The multi-point portable magnetic field strength tester according to claim 6, characterized in that: The peak holding subcircuit includes: an operational amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; The positive input terminal of the operational amplifier U1 is used as the input terminal of the peak holding subcircuit, the negative input terminal of the operational amplifier U1 is electrically connected to the first terminal of the resistor R4, the second terminal of the resistor R4 is electrically connected to the first terminal of the resistor R3, the first terminal of the capacitor C2, the first terminal of the capacitor C3, the first terminal of the capacitor C4, the cathode of the diode D1 and the first terminal of the resistor R2, and the second terminal of the resistor R2 is used as the output terminal of the peak holding subcircuit; The output end of the operational amplifier U1 is electrically connected to the first end of the resistor R1, and the second end of the resistor R1 is electrically connected to the positive electrode of the diode D1; The positive electrode of the power supply of the operational amplifier U1 is electrically connected to the power supply and the first end of the capacitor C1 respectively; The negative power supply electrode of the operational amplifier U1, the second end of the capacitor C1, the second end of the resistor R3, the second end of the capacitor C2, the second end of the capacitor C3 and the second end of the capacitor C4 are all grounded.

8. The multi-point portable magnetic field strength tester according to claim 6, characterized in that: The signal amplification subcircuit includes: an operational amplifier U2, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C5; The positive input terminal of the operational amplifier U2 is used as the input terminal of the signal amplification sub-circuit, and the negative input terminal of the operational amplifier U2 is electrically connected to the first terminal of the resistor R5 and the first terminal of the resistor R6 respectively; The output end of the operational amplifier U2 is electrically connected to the first end of the resistor R7 and the second end of the resistor R6 respectively, and the second end of the resistor R7 is electrically connected to the first end of the resistor R8 and the first end of the capacitor C5 respectively; The second end of the resistor R8 is used as the output end of the signal amplifying sub-circuit, and the second end of the resistor R5 and the second end of the capacitor C5 are both grounded.

9. The multi-point portable magnetic field strength tester according to claim 3, characterized in that: The magnetic field strength tester also includes: a power module, a display screen and a memory; the power module is used to provide working power for the processor, the display screen, the memory, multiple groups of longitudinal detection modules and multiple groups of transverse detection modules, and the display screen and the memory are both electrically connected to the processor.

10. The multi-point portable magnetic field strength tester according to claim 9, characterized in that: The power module includes: a battery, a charging circuit, a power detector and a voltage conversion module; The charging circuit is used to charge the battery, the power detector is used to detect the remaining power of the battery, and the voltage conversion module is used to convert the output voltage of the battery into multiple voltage levels; The power detector is communicatively connected with the processor.

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