Method for determining polarity of diode connected in parallel with coil, control terminal and diode polarity determination device

Abstract

The invention relates to a polarity determination method of a diode connected in parallel with a coil, a control terminal and a diode polarity determination device. The method comprises the following steps: determining an inductance value of an electromagnetic valve coil connected in parallel with a to-be-detected diode; determining the frequency of a verification signal according to the inductance value of the electromagnetic valve coil; controlling the verification signal to be input to the to-be-tested diode, and acquiring a voltage signal of a target test end of the to-be-tested diode at the same time; wherein the type of the verification signal is a triangular wave or a rectangular wave; judging the polarity of the diode to be tested according to the voltage signal of the target test end; and outputting a polarity judgment result of the diode to be detected. According to the invention, a worker can be helped to accurately judge the polarity of the diode connected in parallel with the coil, the probability of occurrence of a clamping piece burnout accident is effectively reduced, and the safety of a nuclear power plant is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plants, and in particular, to a method for determining the polarity of a diode connected in parallel with a coil, a control terminal, and a diode polarity determination device. Background Art

[0002] A large number of solenoid valves are configured in a nuclear power plant. To ensure the safety of the nuclear power plant, reverse diodes are usually provided in the solenoid valves to quickly release the residual energy inside the coil after the solenoid valve is powered off, so that the demagnetization is rapid after power-off. This can not only improve the response speed of the solenoid valve, but also avoid the instantaneous high-voltage electromotive force generated when the coil is turned off from passing through the upstream card or power supply, causing damage to the upstream equipment. However, during a temporary shutdown for maintenance, a nuclear power plant once experienced an accident where the upstream card was burned out after the solenoid valve was replaced. After cause analysis, it was determined that the diode in the solenoid valve was connected in the reverse state, resulting in the inability to absorb the high-voltage electromotive force in time, thus causing the upstream card to be burned out. However, according to the RCCE rating requirements, the valve chamber equipped with an electromagnet is not allowed to be disassembled. Therefore, it is impossible to disassemble the solenoid valve on-site to check the polarity of the diode connected in parallel with the coil. Therefore, the nuclear power plant urgently needs a technical solution capable of determining the polarity of the diode connected in parallel with the coil. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for determining the polarity of a diode connected in parallel with a coil, a control terminal, and a diode polarity determination device.

[0004] The technical solution adopted by the present invention to solve its technical problems is to construct a method for determining the polarity of a diode connected in parallel with a coil, including:

[0005] Determine the inductance value of the solenoid valve coil connected in parallel with the diode to be measured;

[0006] Determine the frequency of the verification signal according to the inductance value of the solenoid valve coil;

[0007] Control the verification signal to be input to the diode to be measured, and at the same time obtain the voltage signal of the target test terminal of the diode to be measured; wherein, the type of the verification signal is a triangular wave or a rectangular wave;

[0008] Judge the polarity of the diode to be measured according to the voltage signal of the target test terminal;

[0009] Output the polarity judgment result of the diode to be measured.

[0010] Preferably, the step of judging the polarity of the diode to be measured according to the voltage signal of the target test terminal includes:

[0011] Judge whether the voltage signal of the target test terminal is greater than a set threshold;

[0012] When the voltage signal of the target test terminal is greater than the set threshold value, it is determined that the target test terminal is the anode of the diode to be tested;

[0013] When the voltage signal of the target test terminal is not greater than the set threshold value, it is determined that the target test terminal is the cathode of the diode to be tested.

[0014] Preferably, the step of determining the frequency of the verification signal according to the inductance value of the solenoid valve coil includes:

[0015] Determine the minimum allowable set frequency according to a preset inductive reactance threshold and an inductive reactance calculation formula;

[0016] Set the frequency of the verification signal to a value greater than the minimum allowable set frequency;

[0017] Among them, the inductive reactance calculation formula is expressed as: f min = X LY / (2*π*L), f min represents the minimum allowable set frequency, X LY represents the inductive reactance threshold, and L represents the inductance value of the solenoid valve coil.

[0018] Preferably, the step of determining the inductance value of the solenoid valve coil connected in parallel with the diode to be tested includes:

[0019] Obtain an inductance value setting instruction through the human-machine interaction module;

[0020] Determine the inductance value of the solenoid valve coil connected in parallel with the diode to be tested according to the inductance value setting instruction.

[0021] Preferably, the step of determining the inductance value of the solenoid valve coil connected in parallel with the diode to be tested includes:

[0022] Output a waveform signal with a set frequency to the solenoid valve coil connected in parallel with the diode to be tested;

[0023] Obtain the voltage signal across the solenoid valve coil and the current signal flowing through the solenoid valve coil;

[0024] Determine the inductance value of the solenoid valve coil according to the set frequency, the voltage signal across the solenoid valve coil, and the current signal flowing through the solenoid valve coil.

[0025] The present invention also constructs a control terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for determining the polarity of the diode connected in parallel with the coil described above are implemented.

[0026] The present invention also constructs a control terminal, including a memory, a processor, and stored in the memory and operable on the above-mentioned diode polarity determination device, including:

[0027] A signal generation module for outputting a verification signal;

[0028] A waveform recording module for collecting the voltage signal of the target test terminal of the diode to be tested; and

[0029] The above-mentioned control terminal.

[0030] Preferably, the diode polarity determination device further includes:

[0031] A human-machine interaction module for displaying the determination result and obtaining a setting instruction.

[0032] Preferably, the diode polarity determination device further includes:

[0033] A current test module for the current signal flowing through the solenoid valve coil.

[0034] Preferably, the diode polarity determination device further includes a housing for accommodating the signal generation module, the control terminal, and the current test module. The housing includes a housing surface, and the human-machine interaction module is arranged on the housing surface;

[0035] A battery module for supplying power to the signal generation module, the control terminal, the human-machine interaction module, and the current test module is further arranged in the housing.

[0036] Implementing the present invention has the following beneficial effects: providing a method for determining the polarity of a diode connected in parallel with a coil, which can help workers accurately determine the polarity of the diode connected in parallel with the coil, effectively reducing the occurrence probability of the accident of the card burning out, and contributing to improving the safety of the nuclear power plant. Brief Description of the Drawings

[0037] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0038] Figure 1 is the program flow chart of the method for determining the polarity of a diode connected in parallel with a coil in an embodiment of the present invention;

[0039] Figure 2 is the program flow chart of step S1 in an embodiment of the present invention;

[0040] Figure 3 is the program flow chart of step S1 in another embodiment of the present invention;

[0041] Figure 4 is the program flow chart of step S2 in an embodiment of the present invention;

[0042] Figure 5 is the program flowchart of step S4 in an embodiment of the present invention;

[0043] Figure 6 is the circuit structure block diagram of the control terminal in an embodiment of the present invention;

[0044] Figure 7 is the circuit schematic diagram of the control terminal in an embodiment of the present invention;

[0045] Figure 8 is the structure schematic diagram of the housing in an embodiment of the present invention. Detailed implementation manners

[0046] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] It should be noted that the flowchart shown in the accompanying drawings is only an exemplary illustration, and does not necessarily include all the contents and operations / steps, nor does it necessarily need to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined. Therefore, the actual execution order may be changed according to the actual situation.

[0048] The block diagrams shown in the accompanying drawings are only functional entities, and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0049] Figure 1 is the program flowchart of the method for determining the polarity of the diode connected in parallel with the coil in an embodiment of the present invention. This method can be applied in the control terminal, and can help the staff efficiently and accurately determine the polarity of the diode connected in parallel with the solenoid valve coil, which is helpful to improve the safety and reliability of the nuclear power plant.

[0050] Please refer to Figure 1 , the method for determining the polarity of the diode connected in parallel with the coil may include step S1, step S2, step S3, step S4, and step S5.

[0051] Step S1 includes: determining the inductance value of the solenoid valve coil connected in parallel with the diode to be measured.

[0052] In one embodiment, the inductance value of the solenoid valve coil can be determined by executing steps S11 and S12 as shown in Figure 2 .

[0053] Step S11 includes: obtaining an inductance value setting instruction through the human-machine interaction module;

[0054] Step S12 includes: determining the inductance value of the solenoid valve coil connected in parallel with the diode to be measured according to the inductance value setting instruction.

[0055] Specifically, the solenoid valve to be replaced is usually a new solenoid valve, and the inductance value of the solenoid valve coil can be obtained from the solenoid valve data sheet (some data sheets will provide the nominal value of the coil inductance) or from the manufacturer. Therefore, after the staff learns the inductance value of the solenoid valve coil, they input the inductance value setting instruction by operating the human-machine interaction module, and then set the size of the inductance value.

[0056] Since the inductance values of the coils of some solenoid valves cannot be obtained from the manufacturer or the data sheet, for this, in another embodiment, the inductance value of the solenoid valve coil can also be determined by performing steps SS11 to SS13 as shown in Figure 3 to determine the inductance value of the solenoid valve coil.

[0057] Step SS11 includes: outputting a waveform signal with a set frequency to the solenoid valve coil connected in parallel with the diode to be measured;

[0058] Step SS12 includes: obtaining the voltage signal across the solenoid valve coil and the current signal flowing through the solenoid valve coil;

[0059] Step SS13 includes: determining the inductance value of the solenoid valve coil according to the set frequency, the voltage signal across the solenoid valve coil, and the current signal flowing through the solenoid valve coil.

[0060] Specifically, the expression for the inductance value of the solenoid valve coil can be: L T = U / (2 * π * f T * I), where L T represents the inductance value of the solenoid valve coil, U represents the voltage signal across the solenoid valve coil, f T represents the set frequency, and I represents the current signal flowing through the solenoid valve coil. The set frequency can be custom-set by the staff according to experience, and the range of the set frequency can be from 500 Hz to 1000 Hz.

[0061] Step S2 includes: determining the frequency of the verification signal according to the inductance value of the solenoid valve coil.

[0062] In one embodiment, the frequency of the verification signal can be determined by performing steps S21 and S22 as shown in Figure 4 to determine the frequency of the verification signal.

[0063] Step S21 includes: determining the minimum allowable set frequency according to a preset inductive reactance threshold and an inductive reactance calculation formula. Among them, the inductive reactance calculation formula can be expressed as: f min = X LY / (2*π*L), f min represents the minimum allowable set frequency, X LY represents the inductive reactance threshold, and L represents the inductance value of the solenoid valve coil.

[0064] In one embodiment, the set value of the inductive reactance threshold is not less than 1000 Ω.

[0065] Furthermore, step S21 may further include: obtaining an inductive reactance threshold setting instruction, and determining the magnitude of the inductive reactance threshold according to the inductive reactance threshold setting instruction. Specifically, the staff can input the inductive reactance threshold setting instruction through operating the human-computer interaction module.

[0066] Step S22 includes: setting the frequency of the verification signal to a value greater than the minimum allowable set frequency.

[0067] In one embodiment, the frequency of the verification signal can be determined in the following manner: determining a set coefficient according to a coefficient setting instruction, and setting the product of the minimum allowable set frequency and the set coefficient as the frequency of the verification signal. Among them, the range of the set coefficient can be 130% to 180%. Among them, the staff can also input the coefficient setting instruction through operating the human-computer interaction module. In this embodiment, the set coefficient can be the default value within the corresponding range or the value at the time of the previous update of the set coefficient, so as to automatically generate the frequency of the verification signal under the default condition.

[0068] Step S3 includes: controlling the verification signal to be input to the diode under test, and simultaneously obtaining the voltage signal of the target test end of the diode under test; among them, the type of the verification signal is triangular wave or rectangular wave. It should be noted that since the polarity of the diode under test is not determined, the target test end can be any end of the diode under test, and the positive output end of the verification signal is connected to the target test end, while the negative output end of the verification signal is connected to the non-target test end (that is, the end other than the target test end) of the diode under test. In addition, the hardware module for collecting the voltage signal of the target test end and the hardware module for outputting the verification signal share the same ground.

[0069] Specifically, the verification signal is configured as a periodic signal with a current not greater than 100 mA, so as to ensure that the current value input to the diode to be tested is small. According to the diode characteristics, the forward conduction voltage drop of the diode usually fluctuates little and can be regarded as a fixed value (for example, the forward conduction voltage drop of a silicon diode is about 0.7 V, and that of a germanium diode is about 0.3 V). The equivalent impedance of the diode when it is forward-conducting is determined by the passing current. Since the current of the verification signal is small, the forward-conducting equivalent impedance of the diode to be tested is small (not greater than 0.07 Ω). According to the inductive reactance calculation formula, when the frequency of the verification signal is set to not less than the minimum allowable set frequency, the inductive reactance value of the solenoid valve coil must be greater than the inductive reactance threshold (1000 Ω). Since the forward-conducting equivalent impedance of the diode to be tested is quite different from the inductive reactance value of the solenoid valve coil, when the verification signal is input, the solenoid valve coil can be equivalently regarded as an open circuit, that is, the influence of the solenoid valve coil on the verification signal can be ignored, which is equivalent to the verification signal only acting on the diode to be tested, thus constructing a test environment in which the polarity of the diode to be tested can be determined.

[0070] It should be noted that the verification signal adopts a triangular wave or a rectangular wave because the triangular wave and the rectangular wave have the characteristics of more stable waveform shape and less likely to be distorted compared with the sine wave or the cosine wave, which helps to improve the test accuracy.

[0071] Step S4 includes: judging the polarity of the diode to be tested according to the voltage signal of the target test terminal.

[0072] In one embodiment, the polarity of the diode to be tested can be determined by performing steps S41 to S43 as shown in Figure 5 shown.

[0073] Step S41 includes: judging whether the voltage signal of the target test terminal is greater than the set threshold.

[0074] Step S42 includes: when the voltage signal of the target test terminal is greater than the set threshold, determining that the target test terminal is the anode of the diode to be tested. It can be understood that due to the unidirectional conduction characteristic of the diode to be tested, when the target test terminal is the anode, the positive half-wave signal of the verification signal will make the diode to be tested conduct, and a positive voltage difference approximately equal to the forward conduction voltage drop of the diode will be formed between the anode and the cathode of the diode to be tested. Therefore, when the voltage signal of the target test terminal is greater than the set threshold, it can be determined that the target test terminal is the anode of the diode to be tested.

[0075] Step S43 includes: when the voltage signal of the target test terminal is not greater than the set threshold, it is determined that the target test terminal is the cathode of the diode to be tested. It can be understood that when the target test terminal is the cathode, although the negative half-wave signal of the verification signal will turn on the diode to be tested, the difference is that the voltage difference between the target test terminal and the non-target test terminal is a negative pressure difference, that is, the measured voltage signal of the target test terminal is a negative pressure and will not be greater than the set threshold. Therefore, when the voltage signal of the target test terminal is not greater than the set threshold, it can be determined that the target test terminal is the anode of the diode to be tested.

[0076] It should be noted that the set threshold can be customized according to the actual situation.

[0077] When the corresponding reference point of the voltage signal of the target test terminal is the non-target test terminal of the diode to be tested, the magnitude of the set threshold is determined by the type of the diode to be tested (silicon diode or germanium diode). The set threshold can be set to be less than the forward conduction voltage drop of the corresponding type of diode. For example, when the diode to be tested is a silicon diode, the set threshold can be set between 0.3V and 0.6V (preferably 0.5V). When the diode to be tested is a germanium diode, the set threshold can be set between 0.07V and 0.17V (preferably 0.15V).

[0078] Step S5 includes: outputting the polarity judgment result of the diode to be tested. In this step, the polarity judgment result can be input to the human-computer interaction module 4 to display the judgment result through the human-computer interaction module 4.

[0079] Figure 6 is the circuit structure block diagram of the control terminal in an embodiment of the present invention. The control terminal may include a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method for determining the polarity of a diode in parallel with a coil provided by the embodiment of the present invention.

[0080] It should be noted that the processor can be an existing single-chip microcomputer or microprocessor.

[0081] Figure 7 is the circuit schematic diagram of the control terminal in an embodiment of the present invention. L1 represents the solenoid valve coil, and D1 represents the diode to be tested.

[0082] As Figure 7 shown, the diode polarity determination device may include a signal generation module 2, a waveform recording module 3, and the control terminal 1 provided by the embodiment of the present invention.

[0083] The signal generation module 2 is used to output a verification signal. The signal generation module 2 can be an existing signal generation module 2 composed of a precision function generator with the model ICL8038, which can output a stable triangular wave or rectangular wave.

[0084] The recording module 3 is used to collect the voltage signal of the target test terminal of the diode to be tested. The recording module 3 can be an existing oscilloscope, and the model of the oscilloscope can be Gen3i. Although the ADC ports of some single-chip microcomputers or microprocessors can directly collect the voltage signal of the target test terminal, the sampling performance is limited, the sampling frequency and sampling accuracy are relatively low, and the risk of measurement error is relatively high. Therefore, the present invention uses a dedicated recording module 3 to collect the voltage signal of the target test terminal, which helps to improve the test accuracy and also facilitates the staff to observe the waveform shape of the voltage signal of the target test terminal in real time to verify the correctness of the test result.

[0085] In one embodiment, as Figure 7 shown, the diode polarity determination device may further include a human-machine interaction module 4.

[0086] The human-machine interaction module 4 is used to display the determination result and obtain setting instructions. Among them, the setting instructions may include an inductance value setting instruction, an inductive reactance threshold setting instruction, and a coefficient setting instruction.

[0087] In one embodiment, the human-machine interaction module 4 may include an existing touch screen.

[0088] In another embodiment, the human-machine interaction module 4 may include an indicator light and a plurality of buttons. The indicator light and each button are connected to the control terminal 1. The staff can input relevant setting instructions by operating the buttons, and the control terminal 1 indicates whether the target test terminal is the anode (equivalent to outputting the polarity judgment result) by controlling the on and off of the indicator light. For example, the indicator light is lit to indicate that the target test terminal is the anode of the diode to be tested.

[0089] For the inductance value test of the solenoid valve coil, in one embodiment, as Figure 7 shown, the diode polarity determination device may further include a current test module 5. The current test module 5 is used for the current signal flowing through the solenoid valve coil. Correspondingly, the recording module 3 is also used to collect the voltage signal across the solenoid valve coil in parallel with the diode to be tested.

[0090] In some embodiments, the current test module 5 may include a current transformer, and the current transformer is sleeved on the input cable or output cable of the solenoid valve coil. Of course, the current transformer can be replaced by an existing current test circuit as long as it can accurately test the current signal flowing through the solenoid valve coil.

[0091] To improve the portability of the present application and facilitate the staff to perform test work on site, in one embodiment, as Figure 8As shown, the diode polarity determination device may further include a housing 10. The housing 10 is used to accommodate the signal generation module 2, the control terminal 1, and the current test module 5 (not shown). The housing 10 includes a housing surface 101, and the human-computer interaction module 4 is disposed on the housing surface. A battery module for supplying power to the signal generation module 2, the control terminal 1, the human-computer interaction module 4, and the current test module 5 is also provided inside the housing 10. Among them, the battery module may include several lithium batteries.

[0092] Further, a battery charging module connected to the battery module and used to charge the battery may be provided inside the housing 10.

[0093] It can be understood that the present invention can help the staff accurately determine the polarity of the diode connected in parallel with the coil, effectively reducing the occurrence probability of the accident of the card burning out, and contributing to improving the safety of the nuclear power plant.

[0094] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0095] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0096] The steps of the method or algorithm described in combination with the embodiments disclosed in this article can be directly implemented by hardware, a software module executed by a processor, or a combination of the two. The software module can be placed in a random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0097] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several modifications and improvements can also be made, which all fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made in accordance with the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A method for determining the polarity of a diode connected in parallel with a coil, characterized in that Including: Determine the inductance value of the solenoid valve coil connected in parallel with the diode to be tested; Determine the frequency of the verification signal according to the inductance value of the solenoid valve coil; Control the verification signal to be input to the diode to be tested, and simultaneously obtain the voltage signal of the target test terminal of the diode to be tested; wherein, the type of the verification signal is triangular wave or rectangular wave; Judge the polarity of the diode to be tested according to the voltage signal of the target test terminal; Output the polarity judgment result of the diode to be tested.

2. The method for determining the polarity of a diode connected in parallel with a coil according to claim 1, wherein The step of judging the polarity of the diode to be tested according to the voltage signal of the target test terminal includes: Judge whether the voltage signal of the target test terminal is greater than the set threshold; When the voltage signal of the target test terminal is greater than the set threshold, determine that the target test terminal is the anode of the diode to be tested; When the voltage signal of the target test terminal is not greater than the set threshold, determine that the target test terminal is the cathode of the diode to be tested.

3. The method for determining the polarity of a diode connected in parallel with a coil according to claim 1, wherein The step of determining the frequency of the verification signal according to the inductance value of the solenoid valve coil includes: Determine the minimum allowable set frequency according to the preset inductive reactance threshold and the inductive reactance calculation formula; Set the frequency of the verification signal to a value greater than the minimum allowable set frequency; Among them, the formula for calculating the inductive reactance is expressed as: f min = X LY / (2*π*L), f min represents the minimum allowable set frequency, X LY represents the inductive reactance threshold, and L represents the inductance value of the solenoid valve coil.

4. The method for determining the polarity of a diode connected in parallel with a coil according to any one of claims 1 to 3, characterized in that, The step of determining the inductance value of the solenoid valve coil connected in parallel with the diode to be tested includes: Obtain the inductance value setting instruction through the human-computer interaction module; Determine the inductance value of the solenoid valve coil connected in parallel with the diode to be tested according to the inductance value setting instruction.

5. The method for determining the polarity of a diode connected in parallel with a coil according to any one of claims 1 to 3, characterized in that The step of determining the inductance value of the solenoid valve coil connected in parallel with the diode to be tested includes: Output the waveform signal of the set frequency to the solenoid valve coil connected in parallel with the diode to be tested; Obtain the voltage signal across the solenoid valve coil and the current signal flowing through the solenoid valve coil; Determine the inductance value of the solenoid valve coil according to the set frequency, the voltage signal across the solenoid valve coil and the current signal flowing through the solenoid valve coil.

6. A control terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it realizes the steps of the method for determining the polarity of the diode connected in parallel with the coil according to any one of claims 1 to 5.

7. A diode polarity determination device, characterized in that, Including: A signal generation module for outputting a verification signal; A waveform recording module for collecting the voltage signal of the target test terminal of the diode to be tested; And The control terminal according to claim 6.

8. The diode polarity determination device according to claim 7, characterized in that, Further including: A human-computer interaction module for displaying the judgment result and obtaining the setting instruction.

9. The diode polarity determination device according to claim 8, characterized in that, Further including: A current test module for the current signal flowing through the solenoid valve coil.

10. The diode polarity determination device according to claim 9, characterized in that, Further including a housing for accommodating the signal generation module, the control terminal and the current test module, the housing includes a housing surface, and the human-computer interaction module is arranged on the housing surface; A battery module for supplying power to the signal generation module, the control terminal, the human-computer interaction module and the current test module is further arranged in the housing.

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