Hand-held electric fan non-invasive charging and discharging test device and automatic detection method

Abstract

The invention discloses a non-invasive charging and discharging test device for a handheld electric fan and an automatic detection method, and belongs to the field of non-invasive automatic detection of handheld electronic equipment.The non-invasive charging and discharging test device comprises an adjustable fixing device module used for adapting to and mechanically fixing handheld electric fans of different models; the charging detection module is connected with the programmable direct-current power supply and is used for charging the handheld electric fan to be detected and monitoring the current of a charging loop in real time; the discharge detection module is used for monitoring the air outlet speed during operation of the handheld electric fan to be detected in real time; and the upper computer software system and display module is connected with the charging detection module and the discharging detection module and is used for controlling start and stop of the charging and discharging process, processing and displaying monitoring data, drawing a data curve and automatically generating a test report. According to the invention, a non-invasive detection mode is adopted, and the test can be completed without modifying the product, so that the integrity of the product is protected, and the detection efficiency is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of non-invasive automated testing technology for handheld electronic devices, and particularly relates to a non-invasive charge and discharge testing device and automatic testing method for handheld electric fans. Background Technology

[0002] In existing technologies, there are various solutions for testing battery charge and discharge performance. One type of solution uses independent detection circuit architectures, each used for precise measurement of charging and discharging current. This design requires multiple current sensing resistors and corresponding signal conditioning circuits. While it has advantages in detection accuracy and signal isolation, the system structure is relatively complex, with a large number of components and a large space footprint. Therefore, it is more suitable for applications with high performance requirements and relatively relaxed size constraints, and it is difficult to meet the needs of highly integrated, miniaturized, and non-invasive multi-product testing scenarios. Another type of solution simulates the charge and discharge characteristics of the battery through internal circuitry. However, the simulated battery characteristics (such as internal resistance and discharge curves) depend on preset circuit parameters, making it difficult to fully reproduce all the dynamic and nonlinear characteristics of a real chemical battery. This can lead to discrepancies between the test results and the actual performance of the product in real-world use. In addition, some solutions mainly control the on / off state of the charge and discharge process by monitoring a single parameter such as temperature, which has limited functionality; or they adopt connection detection mechanisms for high-power non-contact systems, which are complex in structure and expensive. Overall, existing technical solutions often face challenges in terms of versatility, convenience, or test authenticity when applied to routine testing of small portable devices such as handheld electric fans.

[0003] Currently, there is a lack of integrated solutions for testing the charge and discharge performance of handheld electric fans that effectively balance universal compatibility, non-invasive operation, automated testing processes, and accurate reflection of product performance. Existing devices often struggle to quickly and stably adapt to products of different models, sizes, and shapes; the testing process typically requires manual intervention and recording, resulting in low efficiency and inconsistent performance; more importantly, most solutions fail to achieve fully automated monitoring and data analysis of core performance indicators (such as wind speed attenuation during operation), making it impossible to intuitively and accurately assess the performance degradation process and user experience under actual usage conditions. Therefore, developing a convenient, highly adaptable charge and discharge testing device and method that enables non-invasive automated testing and accurately reflects product performance is an urgent problem to be solved. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a non-invasive charge and discharge testing device and automatic detection method for handheld electric fans, thereby resolving the issues present in the prior art.

[0005] To achieve the above objectives, the present invention provides a non-invasive charge and discharge testing device for a handheld electric fan, comprising: An adjustable fixing device module is used to adapt to and mechanically fix different models of handheld electric fans; The charging detection module is connected to a programmable DC power supply and is used to charge the handheld electric fan under test and monitor the charging circuit current in real time. The discharge detection module is used to monitor the airflow speed of the handheld electric fan under test in real time. The host computer software system and display module connect the charging detection module and the discharging detection module. It is used to control the start and stop of the charging and discharging process, process and display monitoring data, draw data curves, and automatically generate test reports.

[0006] Optionally, the adjustable fixing device module includes: A positioning fixture, consisting of a positioning pin and a positioning block, is used to provide a fixed foundation; Clamping bolts are used to generate clamping force by tightening. A clamping handle is connected to a clamping bolt. The clamping handle is used to transmit operating force to drive the clamping bolt to move, thereby stably clamping the handheld electric fan onto the positioning fixture.

[0007] Optionally, the charging detection module includes: The relay control circuit is used to receive instructions from the host computer software system and display module to control the on / off state of the programmable DC power supply output circuit. The current monitoring module is connected in series in the charging circuit to collect the charging current signal; The USB panel interface is used to connect an external charging cable, providing a charging interface for the handheld electric fan under test.

[0008] Optionally, the discharge detection module includes: A wind speed sensor is positioned directly in front of the air outlet of the handheld electric fan to be tested. The wind speed sensor is used to convert the detected wind speed into a standard current signal output. A magnetic mount is used to fix the spatial position of the wind speed sensor and allow manual adjustment of the sensor's position. A programmable logic controller (PLC) is connected to a wind speed sensor to collect current signals and perform analog-to-digital conversion.

[0009] The present invention also provides an automatic detection method for a non-invasive charge and discharge test device for a handheld electric fan, for implementing the aforementioned system, the method comprising the following steps: The handheld electric fan under test is fixed by an adjustable fixing device; The handheld electric fan under test is charged through a charging detection module, and the charging current signal is collected in real time and converted into a digital signal for uploading. The discharge detection module monitors the operating speed of the electric fan and converts the speed signal into a digital signal for uploading. Real-time curves are plotted based on digital current and digital wind speed signals to determine when charging and discharging are complete, and a test report containing test parameters and curves is automatically generated.

[0010] Optionally, the process of charging the handheld electric fan under test through the charging detection module includes: A high-level control signal is obtained based on the start charging command issued by the host computer; The charging circuit is activated by driving the relay to close based on the high-level control signal. The charging process of a handheld electric fan is obtained by controlling the output power of a programmable DC power supply based on the conduction state of the charging circuit. The voltage signal is obtained by acquiring the charging circuit current signal using the current monitoring module; The voltage signal is processed by an ADC analog-to-digital converter to obtain a digital current signal; Real-time charging current data is obtained by reading digital current signals from the host computer.

[0011] Optionally, the process of monitoring the operating wind speed of the electric fan through the discharge detection module includes: The wind speed sensor detects the rotation of the impeller based on the airflow generated by the operation of a handheld electric fan. A pulse signal is obtained based on the impeller rotation; The pulse signal is processed by internal electronic components to obtain a 4-20mA standard current signal; Digital wind speed values ​​are obtained by acquiring current signals using a PLC analog input module; Real-time wind speed data is obtained by reading the digital wind speed value from the host computer. The actual wind speed value is obtained by processing the digital wind speed value based on the linear conversion formula.

[0012] Compared with the prior art, the present invention has the following advantages and technical effects: The technical advantage of this invention lies in providing a highly versatile, automated, and accurate handheld fan charging and discharging testing solution that truly reflects product performance. The adjustable fixing device stably adapts to products of different models and sizes, solving the fixing difficulties caused by the diverse shapes of products in traditional testing. Employing a non-invasive testing method, testing can be completed without modifying the product itself, protecting product integrity while significantly improving testing efficiency. The system automatically completes the testing process and generates detailed reports by real-time monitoring of two core performance indicators: charging current and operating wind speed. This effectively reduces manual operation and ensures the consistency and reliability of test results. The entire solution is easy to operate, offers high testing accuracy, and provides reliable technical support for product development, quality inspection, and performance evaluation. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an overall structural diagram of an embodiment of the present invention; Figure 2 This is a first structural diagram of an embodiment of the present invention; Figure 3 This is a second structural diagram of an embodiment of the present invention; Figure 4 This is a framework diagram of an embodiment of the present invention; Figure 5 This is a flowchart of the automatic charging detection process according to an embodiment of the present invention; Figure 6 This is a flowchart of the automatic discharge detection process according to an embodiment of the present invention. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0016] Example 1 like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment specifically relates to a non-invasive charge / discharge testing device and automatic detection method for a handheld electric fan, which utilizes an adjustable fixing device, a charging monitoring module, and a discharging monitoring module to achieve this. This embodiment can achieve non-invasive automated detection of the charging and running time of the handheld electric fan. A separate current control module can collect the charging current of the handheld electric fan in real time to determine if it is fully charged, and the anemometer in the discharging module can monitor the wind speed of the handheld electric fan in real time to determine if it is fully discharged. This automated detection method is easy to operate, has high testing accuracy, and can effectively save labor costs and improve work efficiency. This invention adopts a user-friendly human-computer interaction interface, is easy to operate, has high testing efficiency and accuracy, and is highly practical. It can not only be used for factory inspection parameter testing, but also is suitable for performance optimization and life testing during the R&D stage of enterprises, as well as performance testing laboratories of third-party testing institutions.

[0017] This embodiment of the adjustable fixing device for a handheld electric fan includes four modules: an adjustable fixing device module, a discharge detection module, a charging detection module, and a host computer software system and display module. This embodiment solves the problem of stable fixing of handheld electric fans due to their diverse models (sizes, dimensions, and shapes) through the adjustable fixing device module. By introducing an independent detection circuit between the programmable DC power supply output and the charging interface, it enables testing of different models of handheld fans without modifying the product itself, greatly improving the applicability and convenience of the testing solution. The discharge detection module, connected to a wind speed sensor, collects real-time wind speed data from the handheld electric fan and uses this data as key information to feed back to the host computer control system, thereby accurately realizing and monitoring the discharge process. The entire system is controlled by the host computer software, which can automatically perform charge and discharge tests, collect data (such as wind speed, current, and time), and generate reports, minimizing manual operation and significantly improving testing efficiency and consistency.

[0018] The adjustable fixing device module includes a positioning pin, a positioning block, a clamping bolt, and a clamping handle, used to fix the handheld electric fan and prevent it from moving or slipping during testing.

[0019] Furthermore, the adjustable fixing device module includes a positioning fixture, a clamping bolt, and a clamping handle. The positioning fixture consists of a positioning pin and a positioning block, and is fixed in the middle position of the positioning block on the overall test platform. The fixture is equipped with a clamping bolt and a clamping handle. By tightening the clamping bolt, the test instrument can be clamped, ensuring the stability and reliability of the test instrument during the testing process.

[0020] The charging detection module includes a programmable DC power supply, a relay control circuit, a current monitoring module, a host computer and control panel, a USB panel interface data cable, a rotary switch, and indicator lights. The working principle of the charging detection module is as follows: 1) The host computer sends commands through the user interface (such as the start / stop charging function button) to control the opening and closing state of the relay control circuit.

[0021] 2) The relay control circuit controls whether the programmable DC power supply outputs according to the issued instructions.

[0022] 3) When the relay is closed, the DC power supply outputs DC power, and the current charges the device under test through the data cable connected to the USB panel.

[0023] 4) Signal acquisition and conversion: The current monitoring module circuit acquires the current signal in the charging circuit in real time. Based on the combination of precision sampling resistor + signal amplification and ADC (analog-to-digital converter), the current signal is converted into a voltage signal, and then into a digital signal for the host computer to read. 5) Host Computer Data Processing: After receiving the data, the host computer reads the current data once every preset time interval (100 milliseconds). The collected data is filtered to remove noise interference and improve data accuracy.

[0024] 6) Curve Plotting and Real-time Display: The host computer combines the processed current data with the corresponding timestamps to form a data point sequence, and plots the It curve on the host computer interface, with time on the horizontal axis and current on the vertical axis. This enables dynamic updates of the curve; as new data is continuously input, the curve extends in real time, intuitively displaying the trend of charging current changes over time.

[0025] 7) Charging completion judgment: The host computer continuously monitors the current data. When the current value drops below 20mA and remains below 20mA for 5 minutes, the charging is judged to be complete.

[0026] 8) At the same time, after observing whether the current curve shows a gentle inflection point, stop charging through the host computer interface. At this time, the relay will disconnect and the power supply will stop outputting.

[0027] The discharge detection module includes a wind speed sensor, a magnetic base, a PLC programmable logic controller, a host computer, and a control panel. The magnetic base is fixed to the overall test platform, and the wind speed sensor is fixed to the end of the magnetic base. The probe of the wind speed sensor is positioned approximately 5-15 cm away from the air outlet of the handheld fan being tested to ensure measurement accuracy. The working principle of the discharge detection module is as follows: 1) Start the discharge: The tester manually adjusts the position of the wind speed sensor from the fan outlet and turns its switch to the highest setting. The fan starts running and consumes battery power, and the discharge process begins.

[0028] 2) Wind Speed ​​Signal Acquisition: The core of the wind speed sensor is the impeller (blade) probe. Its working principle is as follows: when a gaseous or liquid medium flows through, it drives the impeller to rotate. The impeller's rotational speed is closely related to the flow velocity. The magnetic pickup inside the probe handle detects the passing of the blades and generates pulse signals. Internal electronic components then convert these pulse signals into a linear 4-20mA standard current signal output.

[0029] 3) Signal Conversion: The wind speed sensor is wired to the analog input channel of the PLC, and the analog input module of the PLC acquires the current signal in real time. The ADC (Analog-to-Digital Converter) inside the module converts the analog current signal into a digital value for the PLC to read and process, converting the raw value of the acquired current signal into a physically meaningful wind speed value.

[0030] 4) Data Upload to Host Computer: The PLC uploads the digital wind speed value to the host computer via a communication interface (Ethernet). The host computer program reads the data at preset time intervals (100ms) and converts the digital value into the actual wind speed value (e.g., m / s) according to the linear conversion formula of the sensor range. Simultaneously, the collected data undergoes filtering processes such as moving average to suppress fluctuations and improve display stability.

[0031] 5) Curve Plotting and Real-time Display: The host computer combines the processed wind speed data with the corresponding timestamps to form a data point sequence, and dynamically plots a wind speed-time (Qt) curve on the interface. The horizontal axis represents time, and the vertical axis represents wind speed. As new data is continuously input, the curve extends to the right in real time, intuitively displaying the trend of wind speed change over time during the discharge process.

[0032] 6) Discharge completion judgment: The host computer continuously monitors the wind speed data. When the wind speed drops below the preset threshold (0.5 m / s) and remains below it for 5 minutes, it is determined that the battery power is exhausted and the discharge is complete.

[0033] 7) At the same time, after observing the wind speed curve and seeing a gradual inflection point, it is determined that the discharge test has been completed.

[0034] Example 2 An automatic testing method for a non-invasive charge and discharge testing device for a handheld electric fan includes the following steps: fixing the handheld electric fan under test with an adjustable fixing device; charging the handheld electric fan under test through a charging detection module, collecting the charging current signal in real time and converting it into a digital signal for uploading; monitoring the fan's operating wind speed through a discharge detection module, converting the wind speed signal into a digital signal for uploading; plotting a real-time curve based on the current digital signal and the wind speed digital signal, determining whether charging and discharging are complete, and automatically generating a test report containing test parameters and curves.

[0035] like Figure 5 As shown, the charging process of the handheld electric fan under test through the charging detection module includes: obtaining a high-level control signal based on the start charging command issued by the host computer; driving the relay to close based on the high-level control signal to obtain the charging circuit conduction state; controlling the programmable DC power supply to output electrical energy based on the charging circuit conduction state to obtain the charging process of the handheld electric fan; acquiring the charging circuit current signal based on the current monitoring module to obtain the voltage signal; processing the voltage signal based on the ADC analog-to-digital converter to obtain the digital current signal; and obtaining the real-time charging current data based on the host computer reading the digital current signal. The specific implementation operation of the charging detection is as follows: Step 1: Secure the handheld electric fan to be tested onto the adjustable mounting device. Adjust the rotating screw to ensure the fan is stably fixed and does not loosen during normal operation.

[0036] Step 2: Connect the charging cable of the handheld fan. Connect one end of the charging cable to the charging port of the handheld fan and the other end to the USB port of the test bench.

[0037] Step 3: Connect to the mains power supply and turn on the rotary switch to power the entire test bench. At this time, the switch indicator light will show green.

[0038] Step 4: Check the operating voltage of the handheld electric fan under test, then manually adjust the DC power supply setting to the required operating voltage, and click the ON button on the DC power supply to turn on the "main switch" inside the programmable DC power supply and allow power output.

[0039] Step 5: When the "Start Charging" button on the control panel is clicked, the control panel immediately transmits the operation signal to the host computer. Upon receiving the start charging command, the host computer outputs a high-level control signal through its digital output port. This signal is transmitted to the relay drive circuit, which converts the weak electrical signal output by the host computer into a strong electrical signal capable of driving the electromagnetic relay coil. Upon receiving the drive signal, the electromagnetic relay's internal coil is energized, generating a magnetic field based on the principle of electromagnetic induction. The magnetic field causes the moving contact of the relay to overcome the spring resistance and engage with the stationary contact, thus forming a closed circuit. At this time, the programmable DC power supply receives the relay's closing signal and begins to output electrical energy according to the preset output voltage and current parameters. The electrical energy is output from the DC power supply's output port, successfully transmitted to the USB panel interface of the test bench through the internal circuitry. After the charging cable of the handheld fan is inserted into this USB interface, the electrical energy is transmitted through the charging cable to the charging port of the handheld fan under test, charging its built-in battery. Throughout the charging process, the host computer also monitors parameters such as the charging current in real time to ensure the safety and stability of the charging process. When charging needs to be stopped, the user clicks the stop button on the control panel again. The host computer outputs a low-level signal, which de-energizes the relay coil, eliminates the magnetic field, and causes the contacts to return to their original position under the action of the spring, cutting off the output circuit of the programmable DC power supply and stopping charging.

[0040] Step 6: The charging monitoring module monitors the charging current in real time. The current monitoring module circuit collects the current signal in the charging circuit in real time. This module is based on a precision sampling resistor, a signal amplification circuit, and an ADC (analog-to-digital converter). First, the current signal is converted into a voltage signal, and then converted into a digital signal by the ADC for the host computer to read. After receiving the data, the host computer reads the current data once at a preset time interval (100 milliseconds). At the same time, to ensure the accuracy of the data, the host computer filters the collected data to effectively remove noise interference, and records the charging start time as the initial timestamp. During the charging process, the charging time is continuously calculated and accumulated. Meanwhile, the host computer's user interface displays the charging current and charging time parameters, allowing the user to understand the charging status in real time. The host computer combines the processed current data with the corresponding timestamp to form an ordered data point sequence. An It curve is plotted on the host computer interface, with the horizontal axis representing time and the vertical axis representing current. As new data is continuously input, the curve is dynamically updated and extended in real time, intuitively showing the trend of charging current change over time. The host computer continuously monitors the current data. When the current value drops below 20mA and remains below 20mA for 5 minutes, the host computer determines that charging is complete and triggers corresponding prompts or operations, such as stopping charging or recording the charging end time.

[0041] The entire charging monitoring module achieves precise monitoring and effective control of the charging process through data processing and logical judgment by the host computer, ensuring the safety, controllability and efficiency of the charging process.

[0042] Step 7: After charging is complete, click the "Generate Report" button to generate a test report (the report information includes test time, device model information, charging start time, end time, total charging time, maximum current value, minimum current value, average current value, and It curve chart).

[0043] Step 8: Once charging is complete, the indicator light will flash, indicating to staff that charging is finished.

[0044] Step 9: Turn off the rotary switch to disconnect the power supply and complete the charging test.

[0045] like Figure 6 As shown, the process of monitoring the operating wind speed of an electric fan through a discharge detection module includes: obtaining the wind speed sensor impeller rotation based on the airflow generated by the handheld electric fan; obtaining a pulse signal based on the impeller rotation; processing the pulse signal based on internal electronic components to obtain a 4-20mA standard current signal; acquiring the current signal based on the PLC analog input module to obtain a digital wind speed value; obtaining real-time wind speed data by reading the digital wind speed value from the host computer; and processing the digital wind speed value based on a linear conversion formula to obtain the actual wind speed value. The specific implementation process of discharge detection includes: Step 1: Secure the handheld electric fan to be tested onto the adjustable mounting device. Adjust the rotating screw to ensure the fan is stably fixed and does not loosen during normal operation.

[0046] Step 2: Fix the wind speed sensor to the end of the magnetic base. By manually adjusting the base, position the sensor 5-15 cm in front of the fan outlet.

[0047] Step 3: Connect to the mains power supply and turn on the rotary switch to power the entire test bench. At this time, the switch indicator light will show green.

[0048] Step 4: Turn on the handheld electric fan to be tested, set the fan to the highest speed, and start the discharge process.

[0049] Step 5: During discharge detection, the wind speed sensor collects signals and converts them into a 4-20mA current. After analog-to-digital conversion by the PLC, the current is uploaded to the host computer. The host computer performs logic processing and plots a Qt curve. Discharge is considered complete if the wind speed is below 0.5m / s for 5 minutes or if the curve shows a gentle inflection point.

[0050] Step 6: After the discharge test is completed, click the "Generate Report" button to generate a test report (the report information includes test time, equipment model information, discharge start time, end time, total discharge duration, maximum wind speed, minimum wind speed and average wind speed, and Qt curve chart).

[0051] Step 7: After the discharge is complete, the indicator light will turn into a flashing status light to indicate to the staff that the discharge is complete.

[0052] Step 8: Turn off the rotary switch to disconnect the power supply and complete the discharge test.

[0053] Compared to existing technologies, this invention offers the following advantages: 1) The core of the charging module of this invention lies in integrating an independent charging detection circuit, which is connected in series between the programmable DC power supply and the interface of the device under test. It possesses universal adaptability and non-intrusive detection capabilities, seamlessly applicable to the direct testing of various handheld electric fans. During testing, it can display the charging current, time, and current-time curve in real time, and automatically generate a test report after the test, achieving a high degree of automated testing. 2) The discharge module of this invention uses a MiniAir64 blade anemometer, which has a wide range and high precision, measuring speeds from 0.2 to 64 m / s with an accuracy of ±0.2 m / s. It can detect extremely weak airflow, and the thin blade rotation has very low resistance, unaffected by pressure, temperature, density, and humidity. It can accurately monitor the wind speed of the handheld electric fan during operation and upload the data to the host computer. It can display the wind speed data, time, and wind speed-time curve during discharge in real time, and automatically generate a test report after the test, achieving a high degree of automated testing.

[0054] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A non-invasive charge / discharge testing device for a handheld electric fan, characterized in that, include: An adjustable fixing device module is used to adapt to and mechanically fix different models of handheld electric fans; The charging detection module is connected to a programmable DC power supply and is used to charge the handheld electric fan under test and monitor the charging circuit current in real time. The discharge detection module is used to monitor the airflow speed of the handheld electric fan under test in real time. The host computer software system and display module connect the charging detection module and the discharging detection module. It is used to control the start and stop of the charging and discharging process, process and display monitoring data, draw data curves, and automatically generate test reports.

2. The non-invasive charge / discharge testing device for a handheld electric fan according to claim 1, characterized in that, The adjustable fixing device module includes: A positioning fixture, consisting of a positioning pin and a positioning block, is used to provide a fixed foundation; Clamping bolts are used to generate clamping force by tightening. A clamping handle is connected to a clamping bolt. The clamping handle is used to transmit operating force to drive the clamping bolt to move, thereby stably clamping the handheld electric fan onto the positioning fixture.

3. The non-invasive charge / discharge testing device for a handheld electric fan according to claim 1, characterized in that, The charging detection module includes: The relay control circuit is used to receive instructions from the host computer software system and display module to control the on / off state of the programmable DC power supply output circuit. The current monitoring module is connected in series in the charging circuit to collect the charging current signal; The USB panel interface is used to connect an external charging cable, providing a charging interface for the handheld electric fan under test.

4. The non-invasive charge / discharge testing device for a handheld electric fan according to claim 1, characterized in that, The discharge detection module includes: A wind speed sensor is positioned directly in front of the air outlet of the handheld electric fan to be tested. The wind speed sensor is used to convert the detected wind speed into a standard current signal output. A magnetic mount is used to fix the spatial position of the wind speed sensor and allow manual adjustment of the sensor's position. A programmable logic controller (PLC) is connected to a wind speed sensor to collect current signals and perform analog-to-digital conversion.

5. An automatic detection method for a non-invasive charge / discharge testing device for a handheld electric fan, characterized in that, For implementing the system as described in claim 1, the method includes the following steps: The handheld electric fan under test is fixed by an adjustable fixing device; The handheld electric fan under test is charged through a charging detection module, and the charging current signal is collected in real time and converted into a digital signal for uploading. The discharge detection module monitors the operating speed of the electric fan and converts the speed signal into a digital signal for uploading. Real-time curves are plotted based on digital current and digital wind speed signals to determine when charging and discharging are complete, and a test report containing test parameters and curves is automatically generated.

6. The automatic detection method for the non-invasive charge / discharge testing device for a handheld electric fan according to claim 5, characterized in that, The process of charging the handheld electric fan under test through the charging detection module includes: A high-level control signal is obtained based on the start charging command issued by the host computer; The charging circuit is activated by driving the relay to close based on the high-level control signal. The charging process of a handheld electric fan is obtained by controlling the output power of a programmable DC power supply based on the conduction state of the charging circuit. The voltage signal is obtained by acquiring the charging circuit current signal using the current monitoring module; The voltage signal is processed by an ADC analog-to-digital converter to obtain a digital current signal; Real-time charging current data is obtained by reading digital current signals from the host computer.

7. The automatic detection method for the non-invasive charge / discharge testing device for a handheld electric fan according to claim 6, characterized in that, The process of monitoring the operating speed of an electric fan using a discharge detection module includes: The wind speed sensor detects the rotation of the impeller based on the airflow generated by the operation of a handheld electric fan. A pulse signal is obtained based on the impeller rotation; The pulse signal is processed by internal electronic components to obtain a 4-20mA standard current signal; Digital wind speed values ​​are obtained by acquiring current signals using a PLC analog input module; Real-time wind speed data is obtained by reading the digital wind speed value from the host computer. The actual wind speed value is obtained by processing the digital wind speed value based on the linear conversion formula.

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