A multi-sensor magnetic field strength detector with adjustable magnification

Abstract

The utility model provides a kind of multisensor magnetic field intensity detector with amplification multiple setting, it is related to magnetic field intensity detection technical field.The core of the present application is three surfaces are arranged perpendicular to each other in space Hall sensor, encapsulated in the same component and fixed on the equipment to be detected, respectively through predetermined interface and predetermined model's single-chip microcomputer connection, output three-way magnetic field signal.Single-chip microcomputer selects maximum value as detection point magnetic field intensity value after three-way signal acquisition, the value is transmitted to touch screen by isolation 485 communication, shows after rectification by on-screen zoom factor module, simultaneously is locked by data latch circuit, and is driven nixie tube display by LED drive circuit.This detector can quickly capture magnetic field maximum value without repeatedly adjusting sensor position, cooperate accuracy calibration function, it is applicable to equipment magnetic field intensity efficient, accurate detection.

Description

Technical Field

[0001] This utility model relates to the field of magnetic field strength detection technology, specifically to a multi-sensor magnetic field strength detector with adjustable magnification. Background Technology

[0002] During the detection of magnetic field strength, the detected magnetic field strength value is the largest when the surface of the Hall sensor is perpendicular to the magnetic field strength.

[0003] Currently available magnetic field strength detectors typically only have one Hall sensor. During the detection process, the position of the Hall sensor needs to be adjusted multiple times until its surface is perpendicular to the magnetic field strength to capture the maximum value. This is cumbersome and inefficient. Furthermore, existing magnetic field strength detectors also have limitations in terms of detection accuracy and anti-interference capabilities, making them unsuitable for scenarios requiring high accuracy and stability. Utility Model Content

[0004] Purpose of the utility model: To solve the above problems, this utility model designs a multi-sensor magnetic field strength detector with adjustable magnification. By setting three Hall sensors placed perpendicularly to each other, the maximum magnetic field strength can be quickly captured. At the same time, the circuit design is optimized to improve detection accuracy and anti-interference ability.

[0005] The technical solution disclosed in this utility model is as follows:

[0006] A multi-sensor magnetic field strength detector with adjustable magnification includes: a control system minimum system circuit, a power supply circuit, a multi-sensor magnetic field detection circuit, an isolated communication circuit, an isolated power supply circuit, a human-machine interaction circuit, a data latch circuit, a display driver circuit, and a digital tube display circuit.

[0007] The minimum system circuit of the control system includes a core processing chip and is equipped with a reset and debugging interface and a power supply terminal for data acquisition, processing and control command output.

[0008] The power supply circuit is used to convert the external input voltage into a +5.0V voltage to power the minimum system circuit of the control system;

[0009] The multi-sensor magnetic field detection circuit includes at least three magnetic field detection sensors, which are arranged perpendicularly to each other in space. The output terminal is connected to the signal acquisition terminal of the minimum system circuit of the control system to acquire magnetic field strength signals in different directions.

[0010] The isolated communication circuit includes a communication chip and isolation components, and is connected to the communication terminal of the minimum system circuit of the control system to achieve isolated data transmission.

[0011] The isolated power supply circuit can output an independent power supply to power the isolated communication circuit and achieve power isolation from other circuits.

[0012] The human-computer interaction circuit includes a touch screen, a communication interface, a power supply terminal, and a parameter setting module. The communication interface is connected to an isolated communication circuit and is used to display the magnetic field strength value and set the magnetic field strength value adjustment parameters.

[0013] The data latching circuit is connected to the data output terminal of the minimum system circuit of the control system and is used to latch magnetic field strength data.

[0014] The display driving circuit is connected to the output terminal of the data latching circuit, receives latched data and converts it into a driving signal;

[0015] The digital tube display circuit is connected to the display driver circuit and is used to display the magnetic field strength value.

[0016] In a further embodiment, the magnetic field detection sensor in the multi-sensor magnetic field detection circuit is a Hall sensor, model YS1493, and three YS1493 Hall sensors are packaged in the same component, which is fixed on the device to be tested.

[0017] In a further embodiment, the core processing chip of the minimum system circuit of the control system is MC9S12XS128MAA, whose signal acquisition end receives multiple magnetic field strength signals output by the multi-sensor magnetic field detection circuit, and selects the maximum value as the magnetic field strength value of the detection point.

[0018] In a further embodiment, the touch screen of the human-computer interaction circuit is model T8072IE, and its parameter setting module is a magnetic field strength value scaling factor adjustment module. By setting the scaling factor, the detected magnetic field strength value is corrected so that the corrected value matches the detection value of the high-precision magnetic field strength detector.

[0019] In a further embodiment, the isolated communication circuit is a 485 communication circuit, including an RS485 chip and an optocoupler. The optocoupler isolates the power supply of the control system's minimum system circuit from the power supply of the isolated communication circuit. The isolated power supply circuit is a DC-DC isolated power supply circuit, model DC5V-DC5V, with an output voltage of +4.9V.

[0020] In a further embodiment, the data latch circuit includes at least three latch chips, model DM74AS373N; the display driving circuit includes driving branches corresponding to the number of latch chips, which drive different digits of the digital tube display circuit respectively; the digital tube display circuit includes hundreds, tens, and units digits, which correspond to different digits of the displayed magnetic field strength value.

[0021] In a further embodiment, the core chip of the +5.0V power supply circuit is LM2596S-5.0, with an input voltage of +24V, and outputs a stable +5.0V voltage through filtering and voltage regulation components.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] (1) This utility model sets up three Hall sensors that are placed perpendicular to each other, and encapsulates them in the same component and fixes them on the device to be tested. Without having to adjust the sensor position multiple times, the maximum magnetic field strength can be quickly captured, thus improving the detection efficiency.

[0024] (2) The scaling factor of the magnetic field strength value is adjustable, which can correct the detected magnetic field strength value so that the corrected value matches the detection value of the high-precision magnetic field strength detector, thereby improving the detection accuracy.

[0025] (3) Both touch screen and digital tube display modes are set up at the same time, so that staff can choose the appropriate display mode according to actual needs and usage scenarios, thereby improving the practicality of the detector. Attached Figure Description

[0026] Figure 1 The schematic diagram of the minimum system circuit for the control system.

[0027] Figure 2 This is a schematic diagram for a +5.0V power supply.

[0028] Figure 3 This is a wiring diagram for three Hall effect sensors for detecting magnetic field strength placed perpendicularly to each other.

[0029] Figure 4 This is a schematic diagram of a 485 communication circuit with electrical isolation.

[0030] Figure 5 Wiring diagram for DC-DC isolated power supply.

[0031] Figure 6 This is a diagram showing the wiring and menu layout for a touchscreen (T8072IE).

[0032] Figure 7 This is a schematic diagram of a data latch circuit.

[0033] Figure 8 This is a schematic diagram of an LED driver circuit.

[0034] Figure 9 This is a schematic diagram of a digital tube display circuit.

[0035] Figure 10 This is a schematic diagram showing the placement of three Hall sensors for detecting magnetic field strength, which are placed perpendicularly to each other. Detailed Implementation

[0036] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0037] This embodiment discloses a multi-sensor magnetic field strength detector with adjustable magnification, which consists of nine parts: a control system minimum system circuit, a +5.0V power supply circuit, three mutually perpendicular magnetic field strength detection Hall sensor circuits, a 485 communication circuit with electrical isolation function, a DC-DC isolated power supply circuit, a touch screen circuit, a data latch circuit, an LED driver circuit, and a digital tube display circuit.

[0038] I. Minimum System Circuit of Control System

[0039] See Figure 1 The core chip is MC9S12XS128MAA(U1), with pins defined as follows: 61 for VRL, 62 for VSSA, 63 for RX0, 64 for RX0, 65 for PS2, 66 for PS3, 67 for TEST, 68 for PJ7, 69 for PJ6, 70 for PM5, 71 for PM4, 72 for PM3, 73 for PM2, 74 for TX1, 75 for RX1, 76 for VSSX1, 77 for VDDX1, 78 for PP7, 79 for PP5, and 80 for PP4. This circuit also includes a reset circuit for system reset; a BDM interface for system debugging and program downloading; and +5.0V and GND power supplies to provide operating power for the core chip.

[0040] II. +5.0V power supply circuit

[0041] See Figure 2 The core chip is the LM2596S-5.0(U2), with pins FB (feedback pin), IN (power input pin), ON / OFF (switch control pin), and OUT (power output pin). This circuit connects to a +24V power supply, using inductor L5 for energy storage and filtering. Capacitors C2-1, C2-2, C2-3, and C2-4 filter and stabilize the voltage, while resistor R2-1 provides circuit protection and parameter adjustment. The final output is +5.0V, powering modules requiring +5.0V, such as the minimum system circuit of the control system.

[0042] III. Circuit for detecting the intensity of three mutually perpendicular magnetic fields at Hall effect.

[0043] See Figure 3 The core chips all use YS1493 (U3, U4, U5). Each YS1493 is connected to capacitors C3-1, C3-2, C3-3, C3-4, C3-5, and C3-6. These capacitors are used to filter out interference noise in the sensor output signal, ensuring signal stability. The surfaces of the three YS1493s are arranged perpendicularly to each other and encapsulated in the same magnetic field strength sensor assembly, which is fixed to the device under test. The signal output terminals of the three YS1493s are connected to the AD02, AD04, and AD06 interfaces, respectively. The AD02, AD04, and AD06 interfaces are then connected to the corresponding pins of the MC9S12XS128MAA (U1) to realize the transmission of sensor signals to the microcontroller.

[0044] Three of the Hall sensors are perpendicular to each other (see the diagram for their placement). Figure 10 , Figure 10 (a) shows a top view of the three sensors, and (b) shows the AA and BB views in (a). The control system CPU reads the maximum value among the three sensors as the magnetic field strength value at that point.

[0045] IV. 485 communication circuit with electrical isolation function

[0046] See Figure 4 The core chip is U6 (RS485 chip), with pins 5 as GND, 6 as DI (data input), 7 as DE (drive enable), 8 as RE (receive enable), 9 as B (differential signal negative terminal), 10 as A (differential signal positive terminal), 11 as RO (data output), and 12 as VCC. This circuit connects to a +4.9V power supply and GND-1 provided by a DC-DC isolated power supply circuit. Optocouplers G1 and G2 are used to electrically isolate the microcontroller power supply (+5.0V, GND) from the RS485 communication power supply (+4.9V, GND-1), reducing interference to RS485 communication during microcontroller operation and ensuring communication stability. Resistors R4-1, R4-2, R4-3, R4-5, and R4-9 serve functions such as current limiting, voltage division, and impedance matching, respectively. Capacitor C4-1 is used for filtering, improving circuit stability.

[0047] V. DC-DC Isolated Power Supply Circuit

[0048] See Figure 5The core chip is U7 (DC5V-DC5V), whose pins include IN+ (positive input), IN- (negative input), OUT+ (positive output), and OUT- (negative output). The circuit connects capacitors C5-1 and C5-2, as well as an HF component. The HF component acts as a high-frequency filter, while capacitors C5-1 and C5-2 filter out ripple in the input and output voltages, ensuring power quality. The circuit inputs a 5V DC voltage, which, after isolation conversion, outputs +4.9V and GND-1, specifically powering the 485 communication circuit, achieving power isolation and preventing power interference between different circuit modules.

[0049] VI. Touchscreen Circuit

[0050] See Figure 6 The core component is the T8072IE touchscreen (U8), which connects to a +24V power supply and V- to provide power to the touchscreen. Its 485+ and 485- pins connect to the corresponding 485+ and 485- terminals of the 485 communication circuit, enabling data communication between the touchscreen and the microcontroller via the 485 bus. The touchscreen includes a magnetic field strength value scaling adjustment module and a magnetic field strength value display module. Operators can use the scaling adjustment module to set an appropriate scaling factor to correct the detected magnetic field strength value, ensuring the corrected value matches the value detected by a high-precision magnetic field strength detector. Simultaneously, the magnetic field strength value display module allows real-time viewing of the detected magnetic field strength value.

[0051] VII. Data Latch Circuit

[0052] See Figure 7 This system includes three core chips, DM74AS373N (U9, U10, and U11), all connected to a +5.0V power supply and GND to provide operating power for the latches. The OE pin (output enable), VCC pin (positive power supply), PA7 pin (pin 11, data input), D0-D8 pins (data input lines), 1a-in-3g-in pins (data input control), and Q1-Q8 pins (data output) of U9 are connected to their respective lines. Similarly, the OE pin, VCC pin, PB7 pin (pin 11, data input), D0-D8 pins, 1a-in-3g-in pins, and Q1-Q8 pins of U10 are connected to their respective lines. Finally, the OE pin, VCC pin, PA5 pin (data input), D0-D8 pins, 1a-in-3g-in pins, and Q1-Q8 pins of U11 are connected to their respective lines. Furthermore, resistors R7-1, R7-2, and R7-3 are connected to U9, U10, and U11 respectively, serving as current-limiting protection. This circuit is used to receive the magnetic field strength value output by the microcontroller and latch it to ensure that the subsequent driving circuit can stably acquire data.

[0053] 8. LED Driver Circuit

[0054] See Figure 8 The system includes driving circuits for three digital tubes: Digital Tube 1, Digital Tube 2, and Digital Tube 3. The Digital Tube 1 driving circuit includes components such as G1a, G2a, and G3b, as well as resistors R2a-1, R2a-2, R2b-1, R1b-3, and R2b-2. It is connected to a +24V power supply and V-, and is also connected to capacitors C1-2 and C2-3. The capacitors act as filters, and the resistors provide current limiting protection. The Digital Tube 2 driving circuit includes components such as G1b, G2b, and G3c, as well as corresponding resistors and capacitors. The Digital Tube 3 driving circuit includes components such as G1d, G1e, G2e, and G3e, as well as corresponding resistors and capacitors. These three driving circuits are respectively connected to the outputs of the data latch circuits U9, U10, and U11, receiving the latched magnetic field strength data and converting it into signals to drive the digital tubes.

[0055] IX. Digital Tube Display Circuit

[0056] See Figure 9 This includes a hundreds-digit LED display, a tens-digit LED display, and a units-digit LED display, which are respectively connected to the LED driver circuits for LED display 1, LED display 2, and LED display 3. Each pin of the LED display is connected to the corresponding output terminal of the driver circuit. After receiving the drive signal, the hundreds-digit LED display displays the hundreds digit of the magnetic field strength value, the tens-digit LED display displays the tens digit, and the units-digit LED display displays the units digit, thus achieving a clear display of the magnetic field strength value.

[0057] The working principle of this utility model is as follows:

[0058] When this utility model is working, it first converts the +24V power supply to +5.0V through the +5.0V power supply circuit to power the minimum system circuit of the control system. The DC-DC isolated power supply circuit converts the input 5V voltage to +4.9V and GND-1 to power the 485 communication circuit.

[0059] Three YS1493 Hall effect sensors (U3, U4, U5) placed perpendicularly to each other detect the surrounding magnetic field strength, outputting signal values ​​sig-1, sig-2, and sig-3 respectively. These signals are filtered by capacitors and then transmitted to the MC9S12XS128MAA microcontroller (U1) via interfaces AD02, AD04, and AD06. The microcontroller acquires these three signal values ​​and selects the maximum value as the magnetic field strength value at the detection point.

[0060] The microcontroller transmits the selected magnetic field strength value to the touchscreen (U8) via a 485 communication circuit with electrical isolation. After receiving the data, the touchscreen allows operators to adjust the scaling factor using the magnetic field strength value scaling factor adjustment module to correct the magnetic field strength value. The corrected magnetic field strength value is then displayed on the touchscreen's magnetic field strength value display module. Simultaneously, the microcontroller transmits the magnetic field strength value to the data latching circuit. U9, U10, and U11 latch the data and then transmit it to the LED driver circuits for digital tube 1, digital tube 2, and digital tube 3, respectively. The driver circuits convert the data into drive signals, which drive the hundreds, tens, and units digits of the digital tube display circuit, respectively, to achieve digital display of the magnetic field strength value.

[0061] Throughout the entire operation, the 485 communication circuit achieves electrical isolation through optocouplers, and the DC-DC isolation power supply circuit achieves power isolation, effectively reducing interference between various circuit modules and ensuring the detection accuracy and operational stability of the instrument.

[0062] It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments. Without departing from the core features of this utility model, the same function can be achieved by adjusting component models, parameters, etc., and such adjustments all fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims, and all variations falling within the meaning and scope of equivalent elements of the claims are included within this utility model.

Claims

1. A multi-sensor magnetic field strength detector with adjustable magnification, characterized in that, include: The control system includes a minimum system circuit, a power supply circuit, a multi-sensor magnetic field detection circuit, an isolated communication circuit, an isolated power supply circuit, a human-machine interaction circuit, a data latch circuit, a display driver circuit, and a digital tube display circuit. The minimum system circuit of the control system includes a core processing chip and is equipped with a reset and debugging interface and a power supply terminal for data acquisition, processing and control command output. The power supply circuit is used to convert the external input voltage into a +5.0V voltage to power the minimum system circuit of the control system; The multi-sensor magnetic field detection circuit includes at least three magnetic field detection sensors, which are arranged perpendicularly to each other in space. The output terminal is connected to the signal acquisition terminal of the minimum system circuit of the control system to acquire magnetic field strength signals in different directions. The isolated communication circuit includes a communication chip and isolation components, and is connected to the communication terminal of the minimum system circuit of the control system to achieve isolated data transmission. The isolated power supply circuit can output an independent power supply to power the isolated communication circuit and achieve power isolation from other circuits. The human-computer interaction circuit includes a touch screen, a communication interface, a power supply terminal, and a parameter setting module. The communication interface is connected to an isolated communication circuit and is used to display the magnetic field strength value and set the magnetic field strength value adjustment parameters. The data latching circuit is connected to the data output terminal of the minimum system circuit of the control system and is used to latch magnetic field strength data. The display driving circuit is connected to the output terminal of the data latching circuit, receives latched data and converts it into a driving signal; The digital tube display circuit is connected to the display driver circuit and is used to display the magnetic field strength value.

2. The multi-sensor magnetic field strength detector with adjustable magnification according to claim 1, characterized in that, The magnetic field detection sensor in the multi-sensor magnetic field detection circuit is a Hall sensor, model YS1493, and three YS1493 Hall sensors are packaged in the same component, which is fixed on the device to be tested.

3. The multi-sensor magnetic field strength detector with adjustable magnification according to claim 1, characterized in that, The core processing chip of the minimum system circuit of the control system is MC9S12XS128MAA. Its signal acquisition end receives multiple magnetic field strength signals output by the multi-sensor magnetic field detection circuit and selects the maximum value as the magnetic field strength value of the detection point.

4. The multi-sensor magnetic field strength detector with adjustable magnification according to claim 1, characterized in that, The touch screen of the human-computer interaction circuit is model T8072IE. Its parameter setting module is a magnetic field strength value scaling factor adjustment module. By setting the scaling factor, the detected magnetic field strength value is corrected so that the corrected value matches the detection value of the high-precision magnetic field strength detector.

5. The multi-sensor magnetic field strength detector with adjustable magnification according to claim 1, characterized in that, The isolated communication circuit is a 485 communication circuit, which includes an RS485 chip and an optocoupler. The optocoupler isolates the power supply of the minimum system circuit of the control system from the power supply of the isolated communication circuit. The isolated power supply circuit is a DC-DC isolated power supply circuit, model DC5V-DC5V, with an output voltage of +4.9V.

6. The multi-sensor magnetic field strength detector with adjustable magnification according to claim 1, characterized in that, The data latch circuit includes at least three latch chips, model DM74AS373N; the display driving circuit includes driving branches corresponding to the number of latch chips, which drive different digits of the digital tube display circuit respectively; the digital tube display circuit includes hundreds, tens, and units digits, which correspond to different digits of the displayed magnetic field strength value.

7. The multi-sensor magnetic field strength detector with adjustable magnification according to claim 1, characterized in that, The core chip of the +5.0V power supply circuit is LM2596S-5.0, with an input voltage of +24V. It outputs a stable +5.0V voltage through filtering and voltage regulation components.

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