Single-electrode silica gel sheet test circuit, device and method for physical therapy

Abstract

The invention provides a single-electrode silica gel sheet test circuit, device and method for physical therapy. The single-electrode silica gel sheet test circuit comprises a microcontroller, a Darlington tube array chip circuit, a relay array, a signal conditioning circuit and the like. The microcontroller controls the Darlington array to amplify low-power signals, drives the relay array to achieve selection of different test paths, collects and processes test data, and transmits the test data to the computer through a serial port. The relay array alternately switches paths to complete each test item; the signal conditioning circuit is used for adjusting a test signal to meet the AD sampling requirement; the digital control analog switch realizes multiplexing of multiple paths of signals, and a single AD port acquires multiple paths of signals; and the state indicating circuit displays the test result and gives an alarm prompt. The system is specially used for a single electrode plate test scheme, the installation complexity can be remarkably reduced, the stability is improved, and the efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of physiotherapy equipment testing, and in particular relates to a single-electrode silicone sheet testing circuit, device and method for physiotherapy. Background Art

[0002] In physiotherapy equipment, electrode silicone sheets are key components for achieving current output of physiotherapy equipment and acting on the human body. The electrical performance of electrode silicone sheets is directly related to the safe operation of physiotherapy equipment. Especially for warm low-frequency physiotherapy equipment, its electrode silicone sheets are sealed with heating wires, NTC temperature sensors and conductive electrode wires. In addition to the conventional impedance test between the electrodes, the insulation performance between the heating wires, NTC temperature sensors and conductive electrode wires needs to be tested to avoid leakage accidents caused by improper production and processing of the electrode silicone sheets.

[0003] The commonly used electrode silicone sheet testing methods and systems are bipolar testing methods, that is, the two electrode sheet conductive sheets are aligned and fully contacted under the action of external force, and the electrode sheet impedance is tested through signal generators, multimeters, oscilloscopes and other testing tools. This method requires more equipment, the process is cumbersome, the test time is long, and there is a lack of targeted testing systems for electrode sheets with heating and temperature detection functions. Summary of the invention

[0004] In view of the defects and problems existing in the prior art, the present invention provides a single-electrode silicone sheet testing circuit, device and method for physical therapy, which can realize fast and accurate resistance and insulation performance detection, improve test efficiency and ensure the safe use of physical therapy equipment.

[0005] The invention solves the technical problem by adopting a single-electrode silicone sheet test circuit for physical therapy, comprising a microcontroller, a Darlington tube array chip circuit, a relay array, a signal conditioning circuit, a digital control analog switch chip and a state indication circuit; the microcontroller, as a control core, controls the Darlington tube array chip and then controls each relay in the relay array to select a test path in sequence, receives and processes test data, and transmits the result to a computer through a serial port; the Darlington tube array chip amplifies the low-power control signal of the microcontroller, provides high-voltage and high-current driving capability, and controls each relay to be attracted; the relay array comprises a plurality of relays, each relay alternately switches between different test paths, and respectively completes the test of the corresponding project; the signal conditioning circuit receives the test signal of each relay, meets the AD sampling requirement, and ensures the signal strength and stability; the digital control analog switch chip multiplexes multiple signals, realizes the acquisition of multiple test signals by a single AD port, and switches the signal paths of different test items; the state indication circuit displays qualified and unqualified test results, and prompts the test results with an alarm sound.

[0006] Preferably, the relay array includes three relays, forming a resistance test relay array, which respectively tests the thermistor test, the heating resistor test and the electrode resistance test in the single-electrode silicone sheet; in the resistance test relay array, each relay adopts a double-pole double-throw relay to realize synchronous switching of two circuits, and the two NTC wires and the two heating wires in the single-electrode silicone sheet correspond to the two common ends of the relay respectively, one normally open end of each relay is connected to power supply 1, and this end is used as the test end, and the other normally open end is grounded; an electrode wire in the single-electrode silicone sheet is connected to a common end of the corresponding relay, and the other common end of the relay is connected to a conductive heavy block, one normally open end of the relay is connected to power supply 1, and this end is used as the heating resistor test end, and the other normally open end is grounded.

[0007] Preferably, the relay array includes three relays, forming an insulation test relay array, which respectively performs insulation tests on the heating wire and thermistor in the single-electrode silicone sheet, the thermistor and electrode, and the heating wire and electrode; in the insulation test relay array, each relay adopts a double-pole double-throw relay to realize synchronous switching of two circuits, an NTC wire, a heating wire and an electrode wire in the single-electrode silicone sheet, and any two wires of the three wires are randomly selected to form a group, each wire group is respectively connected to the two common ends of the corresponding relay, one normally open end of each relay is connected to power supply 2, and the other normally open end is used as a test end.

[0008] Preferably, it also includes an RS232 interface, and the microcontroller transmits the test results to the RS232 interface to achieve serial communication with the computer, and transmits the test results from the microcontroller to the computer. The test interface between the single-electrode silicone sheet and the circuit test end adopts a DB interface, and the single-electrode silicone sheet and the test circuit are connected by a plug-in type. Preferably, the signal conditioning circuit uses a multiplier circuit when performing a resistance test signal; and uses a secondary operational discharge compression circuit when performing an insulation test signal test.

[0009] A test device based on the test circuit is used, including a shell, a test circuit, a weight block and a tested electrode sheet. The circuit board of the test circuit is installed in the shell. The shell is provided with a test interface, a test button, an indicator light, a power cord and a serial port line. The test circuit adopts the test circuit, and the serial port line communicates with a computer to transmit the test results from the microcontroller to the computer.

[0010] Preferably, a boss is provided on the weight block, and a conductive cloth is passed through the outer side of the boss, and the conductive cloth is in direct contact with the silicone conductive surface of the single-electrode silicone sheet.

[0011] Preferably, the test interface adopts a DB9 interface, and the single-electrode silicone sheet is connected to the test circuit in a plug-in manner.

[0012] A single-electrode silicone sheet testing method for physical therapy is adopted. The Darlington array chip is controlled by a microcontroller, and then the relays in the relay array are controlled to select the test path in sequence. The microcontroller controls each relay to be attracted in sequence, and sequentially realizes the insulation test of the NTC thermistor and the electrode, the resistance test of the heating wire, the insulation test of the heating wire and the NTC thermistor, the NTC thermistor test, the insulation test of the heating wire and the electrode, and the test of the electrode resistance. Then, the signal conditioning circuit is used to receive the test signal of each relay and output it to the digital control analog switch chip, and the signal path is selected by the digital control analog switch chip, and the signal is sent to the AD port of the microcontroller. Finally, the microcontroller transmits the test result to the LED status indication circuit and / or establishes serial port communication with the computer through the RS232 interface, and transmits the test result from the microcontroller to the computer. When the microcontroller determines that the test result exceeds the preset value range of the test, the negative indicator light is lit, and when the test result is within the preset value range of the test, the positive indicator light is lit. As long as one red light is lit, an alarm sound will be issued to indicate that the test fails.

[0013] Preferably, each relay adopts a double-pole double-throw relay to achieve synchronous switching of two circuits; when performing a resistance test, the two NTC wires and the two heating wires in the single-electrode silicone sheet are respectively connected to the two common ends of the corresponding relays, a normally open end of each relay is connected to power supply 1, and the end is used as a test end, and the other normally open end is grounded; an electrode wire in the single-electrode silicone sheet is connected to a common end of the corresponding relay, and the other common end of the relay is connected to a conductive heavy block, a normally open end of the relay is connected to power supply 1, and the end is used as a heating resistor test end, and the other normally open end is grounded; when performing an insulation test, an NTC wire, an electric heating wire and an electrode wire in the single-electrode silicone sheet, any two wires are selected as a group, each wire group is respectively connected to the two common ends of the corresponding relay, a normally open end of each relay is connected to power supply 2, and the other normally open end is used as a test end.

[0014] Preferably, the heating wire is heated by controlling the relay while detecting the change of the NTC thermistor, so as to realize the test of the temperature rise time of the single-electrode silicone sheet.

[0015] Through the above technical solution, the present invention solves the problems of complex, time-consuming and low safety of traditional electrode sheet testing, significantly improves the testing efficiency, accuracy and safety, and has wide application value.

[0016] 1. Single electrode fast test method: By designing a test system for a single electrode, the installation complexity and stability issues of the traditional double electrode test method are overcome, and fast testing without patching is achieved. The test time is significantly shortened, and a single piece test can be completed within 2 seconds, greatly improving the test efficiency.

[0017] 2. Fully automatic test system: The system integrates Darlington array chips and relay arrays controlled by microcontrollers, which can realize automatic resistance and insulation testing, avoid manual intervention, and ensure stable and accurate testing process. The Darlington array provides high voltage and high current control capabilities to ensure test accuracy. The double-pole double-throw relay design ensures stable test path switching and realizes multi-path synchronous switching.

[0018] 3. Multifunctional test content: Supports resistance test (including heating wire, NTC thermistor, electrode resistance) and insulation test (insulation performance between NTC thermistor and electrode, heating wire and NTC thermistor, heating wire and electrode). Added test functions for heating wire heating performance and temperature rise time, expanding application scenarios.

[0019] 4. Signal conditioning and multiplexing technology: Optimize test signals through signal conditioning circuits, and use digitally controlled analog switch chips to collect multiple signals on a single AD port, thereby improving test efficiency and reducing hardware costs.

[0020] 5. Modular and integrated design: The test device adopts a modular structure, including the housing, circuit board, DB9 interface, etc., to ensure convenient system connection. The DB9 interface supports plug-in connection of a variety of single-electrode silicone sheets, simplifying the test object replacement process.

[0021] 6. Human-computer interaction optimization: The system communicates with the computer through the RS232 interface to achieve real-time transmission and analysis of test results, meeting the needs of data storage and in-depth processing. Simple test operation steps are designed, and automation is achieved from equipment initialization to result display, reducing the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a circuit system block diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the detection device of the present invention; Figure 3 yes Figure 2 A schematic diagram of the detection state of the detection device; Figure 4 It is the control circuit diagram of the Darlington array chip; Figure 5 It is the relay array circuit diagram for resistance testing; Figure 6 This is the relay array circuit diagram for insulation testing Figure 7 It is a circuit diagram of a multi-channel multiplexing chip; Figure 8 It is the signal conditioning circuit diagram.

[0023] Numbers in the figure: 1-lower shell; 2-upper cover; 3-test button; 4-DB9 interface; 5-circuit board; 6-RS232 interface; 7-LED indicator light; 8-single electrode silicone sheet; 9-electrode sheet line; 10-weight block; 11-loop line; 12-power line; 13-serial line; 14-mold; 15-positioning groove; 16-boss; 17-conductive cloth. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Example 1: A single-electrode silicone sheet test circuit for physical therapy, such as Figure 1 As shown, the circuit mainly includes a microcontroller, an RS232 chip circuit, a Darlington tube array chip circuit, a relay array circuit, a signal conditioning circuit, a digital control analog switch chip circuit, an LED status indication circuit and a DB9 interface, etc.

[0026] Microcontroller (chip): The microcontroller is used as the control core to execute the test logic, manage the GPIO interface, and realize the high voltage and high current control requirements of the relay through the Darlington array chip. The control circuit of the Darlington array chip is shown in Figure 4. The microcontroller controls the input ports CH1~CH7 of the Darlington array chip U1, thereby controlling the control terminals MYCH1~MYCH7 of the initiator. For example, when CH1 is high, MYCH1 outputs low. The microcontroller also receives and processes test data and transmits the results to the computer through the serial port.

[0027] RS232 interface: realize serial communication with computer; transmit test results from microcontroller to computer.

[0028] Darlington transistor array chip circuit: provides high voltage and high current driving capability to control relay closure; amplifies the low power control signal of the microcontroller. It has high gain characteristics and can achieve precise control. It provides multi-channel output and supports simultaneous control of multiple relays.

[0029] Relay array: Switch different test paths to complete various tests (such as resistance, insulation); realize circuit switch control to ensure the stability of signal testing. Each relay uses a double-pole double-throw relay to achieve synchronous switching of two circuits.

[0030] Signal conditioning circuit: adjust and optimize the signal obtained from the test object to meet the AD sampling requirements; ensure signal strength and stability. Resistance test signal: adopt 1x amplification, simple and reliable. Insulation test signal: match the AD input range through the secondary operation and discharge compression circuit. Provide impedance matching function to improve load capacity.

[0031] Digital control analog switch chip: multiplex multiplex multiple signals to achieve the acquisition of multiple test signals by a single AD port; switch the signal paths of different test items. High integration, save hardware resources, quickly switch channels, and improve acquisition efficiency.

[0032] LED status indicator circuit: Displays test results, divided into green (qualified) and red (unqualified); with alarm sound to indicate test results. Multi-channel indicator lights can intuitively display the results of each test, low power design, fast response.

[0033] DB9 interface: connects the single-electrode silicone sheet to ensure stable signal transmission; provides plug-in connection to simplify test installation. The interface of the single-electrode silicone sheet is a DB9 interface, which has five signal lines, two of which are signal lines for the NTC circuit (thermistor), two are signal lines for the heating wire circuit, and one is the electrode (i.e., output electrical stimulation signal) signal line.

[0034] The test contents of the electrode single electrode silicone sheet include resistance test and insulation test. Resistance test includes heating wire test, NTC thermistor test and electrode test. Insulation test, also known as leakage test, includes insulation test between NTC thermistor and electrode, insulation test between heating wire and NTC thermistor, and test between heating wire and electrode. The specific process of resistance test and insulation (leakage) test is as follows.

[0035] Relay array circuit for resistance testing Figure 5 As shown: like Figure 5 (1) Thermistor test: The two NTC wires in the single-electrode silicone sheet (connected to the relay end through the DB9 interface, the same below) are connected to the two common ends of relay J4 respectively. One normally open end of relay J4 is connected to a 3V DC power supply through a pull-up resistor. This end is used as the thermistor test end, and the other normally open end is grounded. When the common end of control relay J4 is connected to the normally open end, the two NTC wires in the single-electrode silicone sheet form a loop. At this time, the thermistor of the single-electrode silicone sheet can be tested.

[0036] like Figure 5(2) Heating resistor test: The two heating wires in the single-electrode silicone sheet are connected to the two common terminals of the relay J2 respectively. One normally open terminal of the relay J2 is connected to a 3V DC power supply through a pull-up resistor. This terminal is used as the heating resistor test terminal, and the other normally open terminal is grounded. When the common terminal of the control relay J2 is connected to the normally open terminal, the two heating wires in the single-electrode silicone sheet form a loop. At this time, the heating resistor of the single-electrode silicone sheet can be tested.

[0037] like Figure 5 (3) Electrode resistance test: one electrode wire in the single-electrode silicone sheet is connected to a common terminal of relay J6, the other common terminal of relay J6 is connected to a weight block, one normally open terminal of relay J6 is connected to a 3V DC power supply through a pull-up resistor, this terminal is used as the heating resistor test terminal, and the other normally open terminal is grounded; when the common terminal of control relay J6 is connected to the normally open terminal, one electrode wire in the single-electrode silicone sheet forms a loop with the weight block, and the electrode resistance in the single-electrode silicone sheet can be tested at this time.

[0038] Relay array circuit for insulation testing such as Figure 6 As shown: like Figure 6 (1) Insulation test of heating wire and thermistor: an NTC in the single-electrode silicone sheet is connected to a common terminal of relay J3, a heating wire in the single-electrode silicone sheet is connected to the other common terminal of relay J3, a normally open terminal of relay J3 is connected to a 12V DC power supply, and the other normally open terminal is used as the insulation test terminal of the heating wire and thermistor. When the common terminal and the normally open terminal of the control relay J3 are connected, a loop is formed between the heating wire in the single-electrode silicone sheet and the thermistor. At this time, the insulation test of the heating wire and thermistor in the single-electrode silicone sheet can be performed.

[0039] like Figure 6 (2) Thermistor and electrode insulation test: an NTC in the single-electrode silicone sheet is connected to a common terminal of relay J1, and an electrode wire in the single-electrode silicone sheet is connected to the other common terminal of relay J1; one normally open terminal of relay J1 is connected to a 12V DC power supply, and the other normally open terminal is used as the thermistor and electrode insulation test terminal; when the common terminal and the normally open terminal of control relay J1 are connected, a circuit is formed between the thermistor in the single-electrode silicone sheet and the electrode, and the insulation between the thermistor in the single-electrode silicone sheet and the electrode can be tested at this time.

[0040] like Figure 6(3) Test of insulation between heating wire and electrode: A heating wire in the single-electrode silicone sheet is connected to a common terminal of relay J5, and an electrode wire in the single-electrode silicone sheet is connected to the other common terminal of relay J5; one normally open terminal of relay J5 is connected to a 12V DC power supply, and the other normally open terminal is used as the insulation test terminal between the heating wire and the electrode; when the common terminal and the normally open terminal of the control relay J5 are connected, a circuit is formed between the thermistor in the single-electrode silicone sheet and the electrode, and the insulation between the heating wire and the electrode in the single-electrode silicone sheet can be tested at this time.

[0041] When the microcontroller receives the detection command, the AD detection program starts to work, and sends high and low level combinations (there are four level combinations, 00 / 01 / 10 / 11) to the S0 and S1 terminals of the multi-channel multiplexing chip circuit U6, and sends the sampling results for insulation test (V-TEST-AD) and heating wire resistance (JR-AD), NTC thermistor (NTC-AD), and electrode resistance (DCJ-AD) to ADC_IN of U6, respectively, to achieve the requirement of multi-channel AD detection by one AD terminal of the microcontroller. The multi-channel multiplexing chip circuit is shown in Figure 7. Among them, the three groups of insulation tests share V-TEST-AD, and the relays are turned on and off to perform the respective opening and closing tests, reaching the same interface, and realizing the time-sharing sampling of the three ADs under the control of the relays.

[0042] The four AD terminal voltages corresponding to the six tests (corresponding to 4 AD detection signals, of which V-TEST-AD is the test terminal AD shared by the three insulation tests) obtained by switching the relay array are then passed through the signal conditioning circuit (as shown in Figure 8). In Figure 8, the first three tests (heating wire resistance test (JR-AD), NTC thermistor test (NTC-AD), electrode resistance (DCJ-AD) test) do not require additional signal amplification. The first op amp uses 1x amplification, and the second op amp uses voltage follower to perform impedance matching to improve load capacity.

[0043] The insulation test (V-TEST-AD) resistor adopts the first op amp voltage follower and the second op amp signal reduction circuit to meet the voltage input requirements of the AD end of the multi-channel multiplexing chip circuit.

[0044] The program logic design steps for the test of electrode single electrode silicone sheet in resistance test and insulation test are as follows: (1) System initialization, including test-related GPIO port status initialization and AD detection initialization.

[0045] (2) Wait for the test button to be pressed. When the test button is pressed, the microcontroller detects the level change caused by the test button being pressed, thereby triggering the detection command.

[0046] (3) The microcontroller sequentially pulls in each control relay to implement the insulation test of the NTC thermistor and the electrode, the resistance test of the heating wire, the insulation test of the heating wire and the NTC thermistor, the NTC thermistor, the insulation test of the heating wire and the electrode, and the test of the electrode resistance. When the test result exceeds the preset value range of the test (qualified test value range), the corresponding red light is lit; when the test result is within the preset value range of the test (qualified test value range), the corresponding green light is lit. If all six tests pass, six green lights are displayed. If any test fails, the corresponding red light is lit. As long as one red light is lit, an alarm will sound to indicate that the test has failed.

[0047] In addition to the above resistance test and insulation test, based on this circuit, the heating wire can be heated by controlling the relay while detecting the change of the NTC thermistor, so as to test the temperature rise time of the electrode.

[0048] Embodiment 2: A single-electrode silicone sheet testing device for physical therapy, such as Figure 2 and Figure 3 As shown, the device mainly includes a housing, a circuit board 5, a single-electrode silicone sheet 8, an electrode sheet line 9, a weight block 10, a circuit line 11, a power line 12, and a serial line 13. The housing structure adopts an upper and lower shell design, including a lower shell 1 and an upper cover 2 that are fixed to each other. The circuit board 5 of the test circuit is fixedly installed in the lower shell 1, and a single-row LED indicator hole for displaying the test results is provided on the upper cover 2, which is used to install the LED indicator 7. A test button 3 for triggering the start of the test is provided on the upper cover 2. A power line 12 for powering the internal circuit board is provided on the lower shell 1. A serial bus interface for communicating with a computer is provided on the housing and an RS232 interface 6 is installed. Communication is carried out with the computer through a serial port line 13, and the test results are transmitted from the microcontroller to the computer. A test interface for connecting the single-electrode silicone sheet is provided on the lower shell 1. The test interface adopts a DB9 interface 4. The single-electrode silicone sheet 8 is connected to the DB9 interface 4 of the test circuit through the electrode sheet line 9 by plug-in. A weight block 10 connected with a wire (loop line 11) is arranged on the shell, screw holes are arranged inside the shell to realize the fastening installation of the upper and lower shells, a supporting structure for carrying a control circuit board is arranged inside the shell, and reinforcing ribs are arranged for assisting the fixing of the shell.

[0049] The device of this embodiment is used as follows Figure 3As shown, the back of the single-electrode silicone sheet 8 is placed in the positioning groove 15 of the mold 14, and the front of the single-electrode silicone sheet 8 is kept facing upward. Then, the weight block 10 is pressed against the silicone surface of the single-electrode silicone sheet 8. The weight block 10 is a conductive material and has a certain gravity. After the weight block 10 is pressed against the surface of the single-electrode silicone sheet 8, it can maintain a good electrical connection with the single-electrode silicone sheet 8. The operation is simple and the connection effect is good. After the fit is placed, the DB9 interface 4 at the end of the electrode line 9 is plugged in, and the circuit line 11 is connected to the corresponding relay ( Figure 5 The GND terminal of relay 6 in the middle is connected. Figure 5 During the (3) electrode resistance test, the electrode wire (only one) in the single-electrode silicone sheet 8 is connected to a common terminal of the relay J6, and the other common terminal of the relay J6 is connected to the weight block 10 through the loop line 11. A normally open terminal of the relay J6 is connected to a 3V DC power supply through a pull-up resistor, and this terminal is used as the heating resistor test terminal, and the other normally open terminal is grounded. When the microcontroller controls the common terminal of the relay J6 to be connected to the normally open terminal by controlling the Darlington array chip, the electrode wire in the single-electrode silicone sheet 8 and the weight block 10 form a loop, and the electrode resistance in the single-electrode silicone sheet 8 can be tested at this time.

[0050] In addition, since the silicone conductive surface of the electrode is not an absolute plane, in order to ensure the reliability of the electrical connection in the contact state, a boss 16 is set on one side of the weight block 10, and a conductive cloth 17 is added on the boss 16, so that the weight block and the silicone conductive surface can be fully in contact. In actual tests, the resistance after adding this conductive cloth is significantly lower than the test result without adding the conductive cloth, thereby reducing the resistance of the weight block boss and further improving the test accuracy.

[0051] When the test device of this embodiment is used to test electrode resistance, the mechanical stability is higher than that of the original method (two electrode sheets are pasted together for testing, this measurement method requires two pairs of mold bases to be squeezed and then measured, has low reliability and cumbersome operation), can meet the requirements of rapid measurement, and provide possibilities for future robot-assisted testing.

[0052] Embodiment 3: A single-electrode silicone sheet testing method for physical therapy, wherein a microcontroller controls a Darlington array chip, and then controls each relay in the relay array to select a test path in sequence. The microcontroller controls each relay to be attracted in sequence, thereby sequentially implementing insulation testing of an NTC thermistor and an electrode, a heating wire resistance test, an insulation test between a heating wire and an NTC thermistor, an NTC thermistor test, an insulation test between a heating wire and an electrode, and a test of electrode resistance.

[0053] Among them, each relay adopts a double-pole double-throw relay to realize synchronous switching of two circuits; when performing resistance testing, the two NTC wires and two electric heating wires in the single-electrode silicone sheet are respectively connected to the two common ends of the corresponding relays, a normally open end of each relay is connected to power supply one, and the end is used as a test end, and the other normally open end is grounded; an electrode wire in the single-electrode silicone sheet is connected to a common end of the corresponding relay, and the other common end of the relay is connected to a conductive heavy block, a normally open end of the relay is connected to power supply one, and the end is used as a heating resistor test end, and the other normally open end is grounded; when performing insulation testing, an NTC wire, an electric heating wire and an electrode wire in the single-electrode silicone sheet, two wires are randomly selected as a group, and each wire group is respectively connected to the two common ends of the corresponding relay, a normally open end of each relay is connected to power supply two, and the other normally open end is used as a test end.

[0054] Then, the signal conditioning circuit is used to receive the test signal of each relay and output it to the digital control analog switch chip, which selects the signal path and sends the signal to the AD port of the microcontroller. Finally, the microcontroller transmits the test result to the LED status indication circuit and / or establishes serial communication with the computer through the RS232 interface to transmit the test result from the microcontroller to the computer. When the microcontroller determines that the test result exceeds the preset value range of the test, the negative indicator light is lit. When the test result is within the preset value range of the test, the positive indicator light is lit. As long as one red light is lit, an alarm sound will be issued to indicate that the test fails.

[0055] In addition, the temperature rise time of a single-electrode silicone sheet can be tested by controlling the relay to heat the heating wire and detect changes in the NTC thermistor at the same time.

[0056] A test process step of the method of this embodiment is as follows.

[0057] S1. System initialization: 1.1 Power on: Connect the power cord of the test device to power the test system.

[0058] 1.2 Initialize the device: The microcontroller initializes the test-related GPIO pin status; initializes the working mode of the AD test module.

[0059] 1.3 Connect the test object: insert the single-electrode silicone sheet into the DB9 interface on the test circuit board to ensure a firm connection; place the single-electrode silicone sheet in the positioning groove 15 of the mold 14, and press the conductive weight block on the conductive side of the single-electrode silicone sheet to form a closed loop.

[0060] S2. Trigger test: 2.1 Press the test button on the test device to trigger the test command.

[0061] 2.1 The microcontroller starts the test process after the level of the test button changes.

[0062] S3. For each test logic, the microcontroller controls the relay array switching in sequence to complete the following tests: 3.1 Resistance test. Heating wire resistance test: measure the resistance value of the heating wire to confirm that it is within the set range; NTC thermistor test: measure the resistance value of the thermistor to determine whether its performance is normal; electrode resistance test: measure the resistance of a single electrode silicone sheet to verify the conductive performance.

[0063] 3.2 Insulation test. Insulation test between thermistor and electrode: check whether there is leakage between thermistor and electrode; insulation test between heating wire and thermistor: test the insulation performance between heating wire and thermistor; insulation test between heating wire and electrode: test the insulation status between heating wire and electrode to ensure there is no safety hazard.

[0064] 3.3 Additional function test (optional) Heating wire heating performance test: When the heating wire is in working state, the temperature change of the NTC thermistor is tested in real time and the temperature rise time is calculated.

[0065] S4. Data collection and processing: 4.1 The test signal is optimized by the signal conditioning circuit and then sent to the multiplexed AD chip.

[0066] 4.2 The microcontroller collects various test signals in sequence through digitally controlling the analog switch chip.

[0067] 4.3 Analyze the collected data to determine whether it is within the preset qualified range.

[0068] S5. Test results show: 5.1 The LED status indicator shows the result: if the green light is on, the test item has passed; if the red light is on, the test item has failed and an alarm sound is triggered; if all six tests have passed, all six green lights will be on.

[0069] 5.2 Computer display results: The test results are transmitted to the computer via the RS232 interface for further recording or analysis.

[0070] S6. Repeat the test (if necessary): If there are unqualified items, you can reconnect the single electrode silicone sheet or adjust the position of the weight block and test again. After each test, you can quickly change the test object by plugging and unplugging the single electrode silicone sheet.

[0071] S7. Turn off the device: 7.1 After the test is completed, disconnect the power supply.

[0072] 7.2 Archive or record the test results.

[0073] The entire test method is centered on automation, and resistance and insulation tests are performed in sequence, with the results displayed quickly. The steps are clear and easy to operate, avoiding the cumbersome installation and long test time of traditional double-electrode sheet testing, and greatly improving efficiency and reliability. The above-mentioned specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single-electrode silicone sheet test circuit for physical therapy, characterized in that: It includes a microcontroller, a Darlington tube array chip circuit, a relay array, a signal conditioning circuit, a digital control analog switch chip and a status indication circuit; Microcontroller: As the control core, it controls the Darlington array chip and then controls each relay in the relay array to select the test path in sequence, and receives and processes the test data; Darlington transistor array chip: amplifies the low-power control signal of the microcontroller, provides high-voltage and high-current driving capability, and controls the closure of each relay; Relay array: includes multiple relays, each relay alternately switches different test paths to complete the test of the corresponding items; Signal conditioning circuit: receives the test signal from each relay, meets AD sampling requirements, and ensures signal strength and stability; Digital control analog switch chip: multiplex multiplex multiple signals, realize the acquisition of multiple test signals by a single AD port, and switch the signal paths of different test items; Status indication circuit: Displays qualified and unqualified test results, and indicates the test results with an alarm sound.

2. The test circuit according to claim 1, characterized in that: The relay array includes three relays, which constitute a resistance test relay array, and respectively test the thermistor, heating resistor and electrode resistance in the single-electrode silicone sheet; in the resistance test relay array, each relay adopts a double-pole double-throw relay to realize synchronous switching of two circuits, and the two NTC wires and two heating wires in the single-electrode silicone sheet correspond to the two common ends of the relay respectively, one normally open end of each relay is connected to power supply 1, and this end is used as a test end, and the other normally open end is grounded; an electrode wire in the single-electrode silicone sheet is connected to a common end of the corresponding relay, and the other common end of the relay is connected to a conductive heavy block, one normally open end of the relay is connected to power supply 1, and this end is used as a heating resistor test end, and the other normally open end is grounded.

3. The test circuit according to claim 1, characterized in that: The relay array includes three relays, which constitute an insulation test relay array, which respectively performs insulation tests on the heating wire and thermistor in the single-electrode silicone sheet, the thermistor and the electrode, and the heating wire and the electrode; in the insulation test relay array, each relay adopts a double-pole double-throw relay to realize synchronous switching of two circuits, an NTC wire, a heating wire wire and an electrode wire in the single-electrode silicone sheet, and any two wires of the three wires are randomly selected to form a group, each wire group is respectively connected to the two common ends of the corresponding relay, a normally open end of each relay is connected to power supply 2, and the other normally open end is used as a test end.

4. The test circuit according to claim 1, characterized in that: It also includes an RS232 interface, and the microcontroller transmits the test results to the RS232 interface to achieve serial port communication with the computer, and transmits the test results from the microcontroller to the computer; the test interface between the single-electrode silicone sheet and the circuit test end adopts a DB interface, and the single-electrode silicone sheet and the test circuit are connected by plug-in connection.

5. The test circuit according to claim 1, characterized in that: The signal conditioning circuit uses a multiplier circuit when conducting a resistance test signal; the signal conditioning circuit uses a secondary operational discharge compression circuit when conducting an insulation test signal test.

6. A test device based on the test circuit according to any one of claims 1 to 5, comprising a housing, a test circuit, a weight block and an electrode sheet to be tested, characterized in that: The circuit board of the test circuit is installed in a shell, and the shell is provided with a test interface, a test button, an indicator light, a power cord and a serial port line. The test circuit adopts the test circuit described in any one of claims 1-5, and the serial port line communicates with the computer to transmit the test results from the microcontroller to the computer.

7. The testing device according to claim 6, characterized in that: A boss is arranged on the weight block, and a conductive cloth is passed through the outer side of the boss, and the conductive cloth is in direct contact with the silicone conductive surface of the single-electrode silicone sheet.

8. A method for testing a single-electrode silicone sheet for physical therapy, characterized in that: The microcontroller controls the Darlington array chip, and then controls each relay in the relay array to select the test path in sequence. The microcontroller controls each relay to be attracted in sequence, and sequentially realizes the insulation test of the NTC thermistor and the electrode, the resistance test of the heating wire, the insulation test of the heating wire and the NTC thermistor, the NTC thermistor test, the insulation test of the heating wire and the electrode, and the test of the electrode resistance; then the signal conditioning circuit receives the test signal of each relay and outputs it to the digital control analog switch chip, and the signal path is selected by the digital control analog switch chip, and the signal is sent to the AD port of the microcontroller. Finally, the microcontroller transmits the test result to the LED status indication circuit and / or establishes serial port communication with the computer through the RS232 interface, and transmits the test result from the microcontroller to the computer. When the microcontroller determines that the test result exceeds the preset value range of the test, the negative indicator light is lit, and when the test result is within the preset value range of the test, the positive indicator light is lit. As long as one red light is lit, an alarm sound will be issued to indicate that the test fails.

9. The testing method according to claim 8, characterized in that: Each relay adopts a double-pole double-throw relay to realize synchronous switching of two circuits; when performing resistance testing, the two NTC wires and two heating wires in the single-electrode silicone sheet are respectively connected to the two common ends of the corresponding relays, one normally open end of each relay is connected to power supply 1, and this end is used as a test end, and the other normally open end is grounded; one electrode wire in the single-electrode silicone sheet is connected to a common end of the corresponding relay, and the other common end of the relay is connected to a conductive heavy block, one normally open end of the relay is connected to power supply 1, and the end is used as a heating resistor test end, and the other normally open end is grounded; when performing insulation testing, one NTC wire, one heating wire and one electrode wire in the single-electrode silicone sheet, any two wires are selected as a group, each wire group is respectively connected to the two common ends of the corresponding relay, one normally open end of each relay is connected to power supply 2, and the other normally open end is used as a test end.

10. The testing method according to claim 8 or 9, characterized in that: By controlling the relay to heat the heating wire and detect the change of the NTC thermistor at the same time, the temperature rise time of the single-electrode silicone sheet can be tested.

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