Detection device for frequency converter

Abstract

The present application provides a detection device for an inverter. The device includes: a detection circuit, which includes a switching power supply unit, a voltage withstand test unit, and an IGBT test unit. The detection circuit is used to be electrically connected to the inverter, and is used to detect the inverter and generate a detection result. Among them, the voltage withstand test unit is electrically connected to the switching power supply unit and the IGBT test unit respectively. The switching power supply unit is used to provide power for the detection device, the voltage withstand test unit is used to control the output test voltage, and the IGBT test unit is used to detect the IGBT board of the inverter. In the detection device of the present application, a detection circuit is designed. Through the detection circuit, each component of the inverter can be detected, ensuring that the faults of the inverter can be detected quickly and conveniently. The detection device of this solution can help maintenance personnel quickly judge the faults without having to replace a new inverter, reducing the cost.

Description

Technical Field

[0001] This application relates to the field of frequency converter detection, and more specifically, to a detection device for a frequency converter. Background Art

[0002] For the traction frequency converter of the Joy Mining Machine after the Lianli transformation, since it is a domestic transformation, the failure rate of the traction frequency converter will be very high at the beginning. And the employees can neither detect nor repair the faults, and often need the manufacturer to repair. Usually, a new frequency converter needs to be replaced. Since the price of a frequency converter is more than 400,000 yuan, the cost of purchasing accessories is relatively high. Therefore, because the cause of the frequency converter failure cannot be detected currently, only a new frequency converter can be replaced, and the cost of frequently replacing the frequency converter is relatively high. Summary of the Invention

[0003] The main purpose of this application is to provide a detection device for a frequency converter to solve the problem in the prior art that since the cause of the frequency converter failure cannot be detected currently, only a new frequency converter can be replaced, and the cost of frequently replacing the frequency converter is relatively high.

[0004] According to one aspect of an embodiment of the present invention, a detection device for a frequency converter is provided, including: a detection circuit, including a switching power supply unit, a pressure test unit, and an IGBT test unit. The detection circuit is used to be electrically connected to the frequency converter, and the detection circuit is used to detect the frequency converter and generate a detection result. Among them, the pressure test unit is electrically connected to the switching power supply unit and the IGBT test unit respectively. The switching power supply unit is used to provide power for the detection device. The pressure test unit is used to control the output test voltage. The IGBT test unit is used to detect the IGBT board of the frequency converter.

[0005] Optionally, the detection circuit further includes a current transformer test unit, a fan test unit, a first start-stop test unit, a second start-stop test unit, a thyristor conduction test unit, and a starting resistor test unit. Among them, the pressure test unit is electrically connected to the current transformer test unit, the fan test unit, the first start-stop test unit, the second start-stop test unit, the thyristor conduction test unit, and the starting resistor test unit respectively. The current transformer test unit is used to detect the current transformer of the frequency converter. The fan test unit is used to detect the fan of the frequency converter. The first start-stop test unit is used to control the start and pause of the detection process. The second start-stop test unit is used to control the start and pause of the detection process by using a target signal. The thyristor conduction test unit is used to detect the thyristor of the frequency converter. The starting resistor test unit is used to detect the starting resistor of the frequency converter.

[0006] Optionally, the switching power supply unit includes: a power module for inputting a voltage signal, processing the voltage signal, and outputting the processed voltage signal; a pulse width control module electrically connected to the power module for controlling the on-time width of the switch according to the processed voltage signal.

[0007] Optionally, the power module includes: a first transformer sub-module for transforming the input voltage signal; a filtering sub-module electrically connected to the first transformer sub-module for filtering the voltage signal after the transformation process to obtain the processed voltage signal; the pulse width control module includes: a first switch sub-module electrically connected to the filtering sub-module for controlling the switch conduction according to the processed voltage signal; a first control sub-module electrically connected to the first switch sub-module for controlling the duty cycle of the output signal of the first switch sub-module according to the processed voltage signal.

[0008] Optionally, the pressure test unit includes: a pressure test circuit module for generating a self-excited oscillation signal; an output voltage sampling module electrically connected to the pressure test circuit module for generating a test voltage signal according to the self-excited oscillation signal.

[0009] Optionally, the pressure test circuit module includes: a second control sub-module for generating a control signal; a frequency generation sub-module electrically connected to the second control sub-module for generating the self-excited oscillation signal according to the control signal; a first resistor sub-module electrically connected to the frequency generation sub-module; a first triode sub-module electrically connected to the first resistor sub-module; a second transformer sub-module electrically connected to the first triode sub-module for transforming the self-excited oscillation signal; a first diode sub-module electrically connected to the second transformer sub-module; the output voltage sampling module includes: a second resistor sub-module electrically connected to the first diode sub-module; a first isolation sub-module connected to the second resistor sub-module for isolating the second control sub-module and the first relay sub-module; the first relay sub-module electrically connected to the first isolation sub-module for closing or opening according to the control signal of the second control sub-module.

[0010] Optionally, the IGBT test unit includes: a first drive module for generating a drive signal; a voltage stabilization module electrically connected to the first drive module for protecting the frequency converter from being broken down.

[0011] Optionally, the first driving module includes: a third resistor sub-module electrically connected to the pressure test unit; an optocoupler sub-module electrically connected to the third resistor sub-module for generating a driving signal; a fourth resistor sub-module electrically connected to the optocoupler sub-module; the voltage stabilizing module includes: a second diode sub-module electrically connected to the fourth resistor sub-module for clamping and stabilizing the voltage; a fifth resistor sub-module electrically connected to the second diode sub-module for releasing the energy of the IGBT test unit when the frequency converter is turned off.

[0012] Optionally, the current transformer test unit includes: a voltage conversion module for converting the supply voltage and performing voltage division processing on the supply voltage; an isolation module electrically connected to the voltage conversion module for isolating the interference signal of the voltage conversion module.

[0013] Optionally, the voltage conversion module includes: a second relay sub-module for electrically connecting to the current transformer of the frequency converter; a second switch sub-module electrically connected to the second relay sub-module for controlling the second relay sub-module to conduct or disconnect; a sixth resistor sub-module electrically connected to the second switch sub-module for performing voltage division processing on the supply voltage; the isolation module includes: a second isolation sub-module electrically connected to the sixth resistor sub-module for isolating the sixth resistor sub-module and the seventh resistor sub-module; the seventh resistor sub-module electrically connected to the second isolation sub-module; a third diode sub-module electrically connected to the seventh resistor sub-module for clamping and stabilizing the voltage.

[0014] Optionally, the fan test unit includes: a first conduction module for driving and outputting the voltage to the fan of the frequency converter.

[0015] Optionally, the first conduction module includes: a second triode sub-module electrically connected to the pressure test unit for driving and outputting the voltage to the fan of the frequency converter; an eighth resistor sub-module electrically connected to the second triode sub-module; a key sub-module electrically connected to the eighth resistor sub-module for receiving a predetermined operation, and when the predetermined operation is received, the second triode sub-module conducts; a ninth resistor sub-module electrically connected to the second triode sub-module; a third triode sub-module electrically connected to the ninth resistor sub-module for driving and outputting the voltage to the fan of the frequency converter.

[0016] Optionally, the first start / stop test unit includes: a first start module electrically connected to the pressure test unit; a second driving module electrically connected to the first start module for driving the frequency converter to work.

[0017] Optionally, the first startup module includes: a plurality of third relay sub-modules electrically connected to the pressure test unit; a plurality of third switch sub-modules, with one third switch sub-module electrically connected to one third relay sub-module for controlling the conduction or disconnection of the third relay sub-module; the second drive module includes: a tenth resistor sub-module electrically connected to the third relay sub-module; a fourth triode sub-module electrically connected to the tenth resistor sub-module for driving and outputting a drive signal to the frequency converter; a drive sub-module for being electrically connected to the frequency converter and also electrically connected to the tenth resistor sub-module and the fourth triode sub-module for outputting the drive signal to the frequency converter.

[0018] Optionally, the second startup stop test unit includes: an input module electrically connected to the pressure test unit; an adjustment module electrically connected to the input module for adjusting and outputting a current signal to the frequency converter.

[0019] Optionally, the input module includes: a third control sub-module for outputting a current signal; the adjustment module includes: a fifth triode sub-module electrically connected to the third control sub-module for controlling the current signal output to the frequency converter; an eleventh resistor sub-module electrically connected to the fifth triode sub-module; a fourth relay sub-module electrically connected to the eleventh resistor sub-module for adjusting the current signal output to the frequency converter.

[0020] Optionally, the thyristor conduction test unit includes: a second conduction module electrically connected to the pressure test unit for driving and outputting a voltage to the thyristor of the frequency converter.

[0021] Optionally, the second conduction module includes: a sixth triode sub-module electrically connected to the pressure test unit; a twelfth resistor sub-module electrically connected to the sixth triode sub-module; a seventh triode sub-module electrically connected to the twelfth resistor sub-module; a thirteenth resistor sub-module electrically connected to the seventh triode sub-module; an output sub-module electrically connected to the thirteenth resistor sub-module for outputting a voltage to the thyristor of the frequency converter.

[0022] Optionally, the startup resistor test unit includes: a third conduction module electrically connected to the pressure test unit for driving and outputting a voltage to the startup resistor of the frequency converter; a second startup module electrically connected to the third conduction module and also for being electrically connected to the startup resistor of the frequency converter.

[0023] Optionally, the third conduction module includes: a fourth diode sub-module electrically connected to the third conduction module for clamping and voltage regulation; a fifteenth resistor sub-module electrically connected to the fourth diode sub-module; the second startup module includes: an eighth triode sub-module electrically connected to the pressure test unit; a fourteenth resistor sub-module electrically connected to the eighth triode sub-module; a ninth triode sub-module electrically connected to the fourteenth resistor sub-module.

[0024] Optionally, the detection device further includes: a display component electrically connected to the detection circuit for displaying the detection result of the detection circuit.

[0025] In the embodiment of the present invention, a detection circuit is designed. Through the detection circuit, each device of the frequency converter can be detected to ensure that the faults of the frequency converter can be detected quickly and conveniently. The detection device of this solution can help maintenance personnel quickly judge the faults without replacing a new frequency converter, reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The schematic diagrams of the accompanying drawings that form a part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0027] Figure 1 Shows a schematic structural diagram of a detection circuit according to an embodiment of the present application;

[0028] Figure 2 Shows a schematic structural diagram of a switching power supply unit;

[0029] Figure 3 Shows a schematic structural diagram of a pressure test unit;

[0030] Figure 4 Shows a schematic diagram of a pressure test principle;

[0031] Figure 5 Shows a schematic structural diagram of an IGBT test unit;

[0032] Figure 6 Shows a schematic diagram of an IGBT test principle;

[0033] Figure 7 Shows a schematic structural diagram of a current transformer test unit;

[0034] Figure 8 Shows a schematic diagram of a current transformer test principle;

[0035] Figure 9 Shows a schematic structural diagram of a fan test unit;

[0036] Figure 10 Shows a schematic structural diagram of the first start-stop test unit;

[0037] Figure 11 Shows a schematic diagram of the principle of the first start-stop test;

[0038] Figure 12 Shows a schematic structural diagram of the second start-stop test unit;

[0039] Figure 13 Shows a schematic diagram of the PWM waveform of the second start-stop test;

[0040] Figure 14 Shows a schematic diagram of the principle of the second start-stop test;

[0041] Figure 15 Shows a schematic structural diagram of the thyristor conduction test unit;

[0042] Figure 16 Shows a schematic diagram of the principle of the thyristor conduction test;

[0043] Figure 17 Shows a schematic structural diagram of the starting resistance test unit;

[0044] Figure 18 Shows a schematic diagram of the principle of the starting resistance test;

[0045] Figure 19 Shows a schematic diagram of the plug of the detection device of the frequency converter.

[0046] Among them, the above-mentioned drawings include the following reference numerals:

[0047] 10. Switching power supply unit; 110. Power module; 120. Pulse width control module; 1101. First transformer sub-module; 1102. Filter sub-module; 1201. First switch sub-module; 1202. First control sub-module; 20. Pressure test unit; 210. Pressure circuit module; 220. Output voltage sampling module; 2101. Second control sub-module; 2102. Frequency generation sub-module; 2103. First resistor sub-module; 2104. First triode sub-module; 2105. Second transformer sub-module; 2106. First diode sub-module; 2201. Second resistor sub-module; 2202. First isolation sub-module; 2203. First relay sub-module; 30. IGBT test unit; 310. First drive module; 320. Voltage stabilization module; 3101. Third resistor sub-module; 3102. Optocoupler sub-module; 3103. Fourth resistor sub-module; 3201. Second diode sub-module; 3202. Fifth resistor sub-module; 40. Current transformer test unit; 410. Voltage conversion module; 420. Isolation module; 4101. Second relay sub-module; 4102. Second switch sub-module; 4103. Sixth resistor sub-module; 4201. Second isolation sub-module; 4202. Seventh resistor sub-module; 4203. Third diode sub-module; 50. Fan test unit; 510. First conduction module; 5101. Second triode sub-module; 5102. Eighth resistor sub-module; 5103. Button sub-module; 5104. Ninth resistor sub-module; 5105. Third triode sub-module; 60. First start / stop test unit; 610. First start module; 620. Second drive module; 6101. Third relay sub-module; 6102. Third switch sub-module; 6201. Tenth resistor sub-module; 6202. Fourth triode sub-module; 6203. Drive sub-module; 70. Second start / stop test unit; 710. Input module; 720. Regulation module; 7101. Third control sub-module; 7201. Fifth triode sub-module; 7202. Eleventh resistor sub-module; 7203. Fourth relay sub-module; 80. Thyristor conduction test unit; 810. Second conduction module; 8101. Sixth triode sub-module; 8102. Twelfth resistor sub-module; 8103. Seventh triode sub-module; 8104. Thirteenth resistor sub-module; 8105. Output sub-module; 90. Starting resistor test unit; 910. Third conduction module; 920. Second start module; 9101. Fourth diode sub-module; 9102. Fifteenth resistor sub-module; 9201. Eighth triode sub-module; 9202. Fourteenth resistor sub-module; 9203. Ninth triode sub-module. Detailed implementation manners

[0048] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will describe the present application in detail with reference to the accompanying drawings and in combination with the embodiments.

[0049] In order to enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0050] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0051] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or there can also be an intermediate element. Moreover, in the description and claims of the specification, when an element is described as "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0052] For the convenience of description, the following explains some nouns or terms related to the embodiments of the present application:

[0053] As mentioned in the background art, in the prior art, since the cause of the failure of the frequency converter cannot be detected currently, only a new frequency converter can be replaced, and the cost of frequently replacing the frequency converter is relatively high. To solve the above problems, in one embodiment of the present application, a detection device for a frequency converter is provided.

[0054] According to an embodiment of the present application, a detection device for a frequency converter is provided.

[0055] Figure 1 is a schematic structural diagram of a detection device for a frequency converter according to an embodiment of the present application. As Figure 1 shown, the detection device includes:

[0056] The detection circuit includes a switching power supply unit 10, a pressure test unit 20, and an IGBT test unit 30. The above detection circuit is used to be electrically connected to the above frequency converter, and the above detection circuit is used to detect the above frequency converter and generate a detection result.

[0057] Among them, the above pressure test unit 20 is electrically connected to the above switching power supply unit 10 and the above IGBT test unit 30 respectively. The above switching power supply unit 10 is used to provide power for the above detection device. The above pressure test unit 20 is used to control the output test voltage. The above IGBT test unit 30 is used to detect the IGBT board of the above frequency converter.

[0058] In the above detection device, a detection circuit is designed. Through the detection circuit, each device of the frequency converter can be detected, ensuring that the faults of the frequency converter can be detected quickly and conveniently. The detection device of this solution can help maintenance personnel quickly judge the faults without replacing a new frequency converter, reducing the cost.

[0059] Specifically, the detection device also includes a connection component (such as a plug). Through the connection component, the detection circuit can be connected to each period of the frequency converter, making the detection faster and more accurate. At the same time, the detection device of this solution has a small volume and is convenient to carry.

[0060] In an embodiment of the present application, the above detection circuit further includes a current transformer test unit 40, a fan test unit 50, a first start-stop test unit 60, a second start-stop test unit 70, a thyristor conduction test unit 80, and a starting resistance test unit 90. Among them, the above pressure test unit 20 is electrically connected to the above current transformer test unit 40, the above fan test unit 50, the above first start-stop test unit 60, the above second start-stop test unit 70, the above thyristor conduction test unit 80, and the above starting resistance test unit 90 respectively. The above current transformer test unit 40 is used to detect the current transformer of the above frequency converter. The above fan test unit 50 is used to detect the fan of the above frequency converter. The above first start-stop test unit 60 is used to control the start and pause of the detection process. The above second start-stop test unit 70 is used to control the start and pause of the detection process by using a target signal. The above thyristor conduction test unit 80 is used to detect the thyristor of the above frequency converter. The above starting resistance test unit 90 is used to detect the starting resistance of the above frequency converter. In this embodiment, since the detection circuit further includes multiple test units, and each test unit corresponds to each device in the frequency converter, and one test unit is used to detect one device in the frequency converter, the detection circuit can detect each device in the frequency converter.

[0061] In another embodiment of the present application, as Figure 1As shown, the above-mentioned switching power supply unit 10 includes a power module 110 and a pulse width control module 120. The power module 110 is used to input a voltage signal, process the voltage signal, and output the processed voltage signal. The pulse width control module 120 is electrically connected to the power module 110 and is used to control the conduction pulse width of the switch according to the processed voltage signal. In this embodiment, the power module can output a voltage signal to supply power to the entire detection device, and the pulse width can be adjusted through the pulse width control module.

[0062] In another embodiment of the present application, as Figure 1 shown, the above-mentioned power module 110 includes a first transformer sub-module 1101 and a filtering sub-module 1102. The first transformer sub-module 1101 is used to perform voltage transformation on the input voltage signal. The filtering sub-module 1102 is electrically connected to the first transformer sub-module 1101 and is used to perform filtering on the voltage signal after voltage transformation to obtain the processed voltage signal. The above-mentioned pulse width control module 120 includes a first switch sub-module 1201 and a first control sub-module 1202. The first switch sub-module 1201 is electrically connected to the filtering sub-module 1102 and is used to control the conduction of the switch according to the processed voltage signal. The first control sub-module 1202 is electrically connected to the first switch sub-module 1201 and is used to control the duty cycle of the output signal of the first switch sub-module 1201 according to the processed voltage signal. In this embodiment, the first transformer sub-module and the filtering sub-module can further efficiently process the voltage signal, making the processed voltage signal less interfered and more stable. The first switch sub-module and the first control module can further control the duty cycle of the output signal, thereby efficiently adjusting the pulse width.

[0063] Specifically, as Figure 2As shown, the first transformer sub-module includes a voltage transformer T1. The first transformer sub-module also includes a plurality of windings (windings 2, 13, 1, 5, 6, 4, 14, 3, 9, 12, 10, 7, 11, 8 respectively). The first transformer sub-module also includes diodes D21, D23, capacitors E19, E20, C39, C40, C41, C42, resistors R76, R87. The first transformer sub-module also includes diodes D18, D20, capacitors E12, C29, E16, C33, voltage regulator chips 7815, 7906, capacitors E14, E17, C30, C34, C31, C35, resistors R64, R74, R68 and diode LED6. The first transformer sub-module also includes diodes D2, C50, E13, D27, E4, E5, C26, the first voltage regulator chip 78l12, 79l12, capacitors E1, E3, C3, C7, C6, C9, resistors R18, R23. The first transformer sub-module also includes C32, R70, D22, D8 and D19. There are two filter sub-modules, namely the first filter sub-module and the second filter sub-module. The first filter sub-module includes inductor L2, capacitors E10, C49 and resistor R19. The second filter sub-module includes capacitors E6, E11, C24, C28, C25, C27, resistors R24 and R60. The first switch sub-module includes switch tube IRF3710. The first control sub-module includes power management chip UC3845, the second voltage regulator chip 78l12, capacitors C36, E18, C38, C37, resistors R75, R86, R95, optocoupler chip PC817, resistors R98, R99, R100, diode DZ6, capacitor C45, voltage regulator chip TL431, capacitor C46, resistors R101, R102, R103, capacitor C43, resistors R89, R78, capacitor C44, resistors R94, R96 and R97. The power management chip UC3845 is the core part of the switching power supply unit. The input is powered by a 24V lithium battery, and the outputs are +5V, -5V, 24V each in one path, and +15V, -6V each in two paths. +5V is for the single-chip microcomputer and the 5V circuit, -5V is for the operational amplifier, 24V is for the relay and related circuits, and +15V, -6V each in two paths of power supply provide power for the IGBT test unit.

[0064] The switching power supply unit is built-in with a portable 24V lithium battery. The 24V powers the voltage regulator chip 78l12, and the voltage regulator chip 78l12 generates 12V power for the power management chip UC3845. After the power management chip UC3845 gets the 12V voltage, it generates a 5V VREF reference voltage internally. The 5V VREF reference voltage goes to the capacitor C43 for adjusting the frequency and the pin 4 of the power management chip UC3845 through a resistor ( Figure 2 R75 in

[0065] ). By adjusting the switch inside the power management chip UC3845, the frequency of the pin 6 output externally by the power management chip UC3845 is adjusted, thereby controlling the duty cycle of the externally output PWM, and further adjusting the output voltage. Figure 2 The loop of the transformer is as follows: 24V lithium battery + transformer winding 5 to winding 6 to the switching tube IRF3710 to the current sampling resistor (two 0.47-ohm resistors in parallel ( Figure 2 R96 and R97 in Figure 2 )) to the DC- of the lithium battery to form a loop. The PWM wave signal generated by the pin 6 of the power management chip UC3845 drives the switching tube IRF3710 through a 22-ohm current-limiting resistor ( Figure 2 R78 in Figure 2 ). Thus, the windings 5 and 6 of the transformer store and release electromagnetic energy, completing the conversion of electrical energy into magnetic energy, and then the magnetic energy on the primary side of the transformer T1 is converted into magnetic energy on the secondary side. There are 4 winding outputs on the secondary side of the transformer, and different voltages are output through rectification and voltage regulation. Windings 3 and 4 are rectified by diodes ( Figure 2 D2 and D27 in

[0066] ), filtered by an inductor ( Figure 2 L2 in Figure 2 Figure 2 and capacitors ( Figure 2 E10 and C49 in Figure 2 )) to output 24V1 direct current. Windings 9, 10, and 12 generate +5V1 direct current through the voltage regulator chip AMS1117-5 ( Figure 2 7815 in

[0066] ), and generate -5V1 direct current through the voltage regulator chip 7906. Windings 7, 8, and 11 generate +15V2 direct current through the voltage regulator chip 7815, and generate -9V2 direct current through the voltage regulator chip 7906. Windings 1, 2, and 13 generate +15V1 direct current through the voltage regulator chip 7815, and generate -9V1 direct current through the voltage regulator chip 7906. The voltage regulation loop is as follows: 24V output terminal + 5 resistors ( Figure 2 R98, R100, R101, R102, R103 in Figure 2 are connected in series for voltage division to the R terminal of the voltage regulator chip TL431. 24V + another path with a current-limiting resistor ( Figure 2 R99 in Figure 2to the K terminal of the voltage regulator chip TL431. The principle is that when the 24V output voltage is high, the R terminal of the voltage regulator chip TL431 samples. The A terminal and the K terminal of the voltage regulator chip TL431 conduct, the current increases, the conduction current between the 1st and 2nd pins of the optocoupler chip PC817 increases, and it is fed back to the 3rd and 4th pins of the optocoupler chip PC817. The 8th pin 5VREF of the power management chip UC3845 - the 4th pin of the optocoupler chip PC817 - the 3rd pin of the optocoupler chip PC817 - through a current - limiting resistor ( Figure 2 in R95) to GND, and one through a current - limiting resistor ( Figure 2 in R86) to the voltage feedback terminal 2 of the power management chip UC3845. After receiving the signal, the power management chip UC3845 adjusts the internal switching frequency of the power management chip UC3845, thereby controlling the PWM signal output from the 6th pin, reducing the PWM signal, and further reducing the output voltage to achieve the purpose of voltage stabilization.

[0067] The current - regulating loop is as follows: When current flows through the two 0.47 - ohm current - sampling resistors ( Figure 2 in R96 and R97), according to Ohm's law U = IR, when the current increases, the voltage increases. It is limited by a 510 - ohm resistor ( Figure 2 in R94), filtered by a 0.1uF capacitor, and this voltage is fed back to the 3rd pin of the power management chip UC3845. After detecting this voltage increase, the power management chip UC3845 reduces the PWM signal output of the power management chip UC3845. The PWM signal decreases, the current passing through the current sampling decreases, and the voltage decreases, thus achieving the purpose of regulating the current.

[0068] The power module also includes a power input terminal (the input uses a 24V lithium - battery power supply) and a power output terminal. The switching transistor IRF3710 is connected to the primary coil of the transformer. The switching transistor IRF3710 controls the conduction pulse width through the PWM signal. The pulse - width control module is used to obtain the output voltage of the power output terminal and output a PWM signal to the switching transistor IRF3710 according to the comparison result between the output voltage and the internal reference voltage to control the conduction pulse width of the switching transistor IRF3710. The switching transistor IRF3710 is grounded through two 0.47 - ohm current - detection resistors ( Figure 2 in R96 and R97). The current - detection pin of the power management chip UC3845 is grounded through a capacitor ( Figure 2 in C44) and connected to the switching transistor IRF3710 and two 0.47 - ohm current - detection resistors ( Figure 2 in R96 and R97) through a resistor ( Figure 2 in R94).

[0069] In another embodiment of the present application, as Figure 1As shown in the figure, the above-mentioned pressure test unit 20 includes a pressure circuit module 210 and an output voltage sampling module 220. The pressure circuit module 210 is used to generate a self-excited oscillation signal; the output voltage sampling module 220 is electrically connected to the above-mentioned pressure circuit module 210 and is used to generate a test voltage signal according to the above-mentioned self-excited oscillation signal. In this embodiment, the test process of the frequency converter can be controlled more efficiently through the pressure circuit module and the output voltage sampling module, and the test voltage signal can be controlled more efficiently.

[0070] In another embodiment of the present application, as Figure 1 shown in the figure, the above-mentioned pressure circuit module 210 includes a second control sub-module 2101, a frequency generation sub-module 2102, a first resistor sub-module 2103, a first triode sub-module 2104, a second transformer sub-module 2105 and a first diode sub-module 2106. The second control sub-module 2101 is used to generate a control signal; the frequency generation sub-module 2102 is electrically connected to the above-mentioned second control sub-module 2101 and is used to generate the above-mentioned self-excited oscillation signal according to the above-mentioned control signal; the first resistor sub-module 2103 is electrically connected to the above-mentioned frequency generation sub-module 2102; the first triode sub-module 2104 is electrically connected to the above-mentioned first resistor sub-module 2103; the second transformer sub-module 2105 is electrically connected to the above-mentioned first triode sub-module 2104 and is used to perform voltage transformation on the above-mentioned self-excited oscillation signal; the first diode sub-module 2106 is electrically connected to the above-mentioned second transformer sub-module 2105; the above-mentioned output voltage sampling module 220 includes a second resistor sub-module 2201, a first isolation sub-module 2202 and a first relay sub-module 2203. The second resistor sub-module 2201 is electrically connected to the above-mentioned first diode sub-module 2106; the first isolation sub-module 2202 is connected to the above-mentioned second resistor sub-module 2201 and is used to isolate the above-mentioned second control sub-module 2101 and the first relay sub-module 2203; the above-mentioned first relay sub-module 2203 is electrically connected to the above-mentioned first isolation sub-module 2202 and is used to close or disconnect according to the above-mentioned control signal of the above-mentioned second control sub-module 2101. In this embodiment, the test process of the pressure of the frequency converter can be controlled more efficiently, and then the pressure test of each device of the frequency converter can be carried out more efficiently.

[0071] Specifically, as Figure 3 shown in the figure, the second control sub-module includes a single-chip microcomputer STC15W408AS( Figure 3In U6), the frequency generation sub-module includes a frequency signal generation chip NE555, a resistor R35, a resistor R37, a capacitor C17, and a capacitor C15. The first resistor sub-module includes a resistor R38. The first triode sub-module includes a triode Q12. The second voltage transformation sub-module includes a voltage multiplier transformer TF1. The first diode sub-module includes diodes D10, D11, D12, D13, D14, D15, a capacitor C10, and a capacitor C12. The second resistor sub-module includes a resistor R26 and a resistor R27. The first isolation sub-module includes a first isolation chip MAX9944, a capacitor C19, a resistor R50, a diode D16, a capacitor C14, a resistor R39, a resistor R55, a resistor R44, a resistor R49, a resistor R51, a second isolation chip MAX9944, a capacitor C18, a resistor R48, a capacitor C16, a resistor R36, a resistor R40, a resistor R43, a resistor R46, a resistor R54, a resistor R47. The first relay sub-module includes a relay chip ULN203( Figure 3 In U5), two relays HS1, a switch JK4, and a switch JK5. The core of the pressure test unit is the frequency signal generation chip NE555. A DC voltage of 0 - 200V - 2400V is generated by secondary isolation and voltage multiplication of a transformer. The relay chip is used to switch the 200 - 2400V voltage circuit to ensure the test safety of the device. The program is controlled by a single-chip microcomputer STC15W408AS. The corresponding test voltage is displayed on the touch screen for use by other test units for testing.

[0072] The pressure test circuit module is as follows: A self-oscillation is generated by a frequency signal generation chip NE555. The enable control pin 4 of the frequency signal generation chip NE555 is controlled at a low level by the single-chip microcomputer. The 2nd pin of the frequency signal generation chip NE555 is a 0.01uF oscillation capacitor that determines the oscillation frequency. The 3rd pin of the frequency signal generation chip NE555 generates a PWM wave, which passes through a current-limiting resistor( Figure 3 R38 in Figure 3 to the triode( Figure 3 Q12 in Figure 3 to drive the voltage multiplier transformer( Figure 3 TF1 in Figure 3The normally open contacts of the relay R26 and R27) in it output a voltage of 0 - 2400VDC. The voltage output adopts the relay isolation method. The relay is controlled by a single-chip microcomputer. Only when the external input button is pressed, the relay will pull in and the voltage will be output, ensuring safety. The output terminal samples two single-strand wires. When the pressure test is not required usually, the two wires of the pressure output line are short-circuited together to ensure safety.

[0073] The output voltage sampling module is as follows: Through six resistors ( Figure 3 R36, R40, R43, R46, R54, R47) in it are connected in series for voltage division, and a voltage of 0 - 1V (corresponding to 0 - 2400V) is taken to supply power to the dual-power supply (+5V - 5V) for voltage sampling of the operational amplifier isolation chip MAX9944. The isolation chip MAX9944 plays an isolation role, isolating the high-voltage part and the single-chip microcomputer circuit. After passing through a 1k ohm resistor ( Figure 3 R50) in it for current limiting, and a filter capacitor ( Figure 3 C19) in it for filtering, it supplies power to the ADC sampling pin of the single-chip microcomputer. The single-chip microcomputer processes it through internal programming, displays the voltage on the touch screen, and simultaneously displays the voltage change in the form of a curve. When in use, for example, when measuring the quality of a thyristor, clamp the two clips on the anode (A terminal) and cathode (K terminal) of the thyristor respectively, turn on the pressure control button, press the pressure permission button, and the pressure is output. For example, if the allowable withstand voltage of the thyristor is 1200V and the voltage rises to 800V, it means the thyristor is damaged and cannot be used, and a thyristor of the same model needs to be replaced. If the voltage rises to 1300V, it proves that the withstand voltage of the thyristor is okay. When the IGBT test unit is under pressure, the gate (G terminal) and the emitter (E terminal) need to be short-circuited. Clamp the two clips on the collector (C terminal) and the emitter (E terminal) respectively, press the pressure permission button. If the voltage displayed is greater than the nominal voltage value of the IGBT, the IGBT board has no problem with withstand voltage; otherwise, the IGBT board is damaged and cannot be used, and an IGBT board of the same model needs to be replaced.

[0074] The schematic diagram of the pressure test is as Figure 4 shown. Clamp the black test wire to 1#, the red test wire to 2#, press the pressure voltage button, release the pressure permission button, press the pressure output button on the touch screen, observe the curve voltage on the touch screen, and test with 1# and 2# reversed. If the voltage is too low, the thyristor cannot be used and some components need to be replaced.

[0075] In a specific embodiment of this application, as Figure 1As shown, the above IGBT test unit 30 includes a first drive module 310 and a voltage stabilization module 320. The first drive module 310 is used to generate a drive signal; the voltage stabilization module 320 is electrically connected to the first drive module 310 and is used to protect the above frequency converter from being broken down. In this embodiment, through the first drive module and the voltage stabilization module, the IGBT board of the frequency converter can be tested more efficiently, and the safety of the IGBT board of the frequency converter can also be ensured during the test process.

[0076] In another specific embodiment of the present application, as Figure 1 shown, the above first drive module 310 includes a third resistor sub-module 3101, an optocoupler sub-module 3102, and a fourth resistor sub-module 3103. The third resistor sub-module 3101 is electrically connected to the above voltage withstand test unit; the optocoupler sub-module 3102 is electrically connected to the third resistor sub-module 3101 and is used to generate a drive signal; the fourth resistor sub-module 3103 is electrically connected to the optocoupler sub-module 3102; the above voltage stabilization module 320 includes a second diode sub-module 3201 and a fifth resistor sub-module 3202. The second diode sub-module 3201 is electrically connected to the fourth resistor sub-module 3103 and is used for clamping and voltage stabilization; the fifth resistor sub-module 3202 is electrically connected to the second diode sub-module 3201 and is used to release the energy of the IGBT test unit when the above frequency converter is turned off. In this embodiment, through the third resistor sub-module, the optocoupler sub-module, the fourth resistor sub-module, the second diode sub-module, and the fifth resistor sub-module, the IGBT board of the frequency converter can be tested more efficiently.

[0077] Specifically, as Figure 5 shown, the third resistor sub-module includes resistor R81, resistor R45, resistor R85, resistor R42, the optocoupler sub-module includes optocoupler chips Q13 and Q14, the fourth resistor sub-module includes resistor R52, resistor R53, the second diode sub-module includes diodes D24, D25, DZ2, DZ3, DZ4, DZ5, and the fifth resistor sub-module includes resistor R65, resistor R80.

[0078] The above IGBT test unit is composed of a +15 drive voltage and a -6V to -9V turn-off voltage. The drive signal comes from the optocoupler chip P341, and the optocoupler chip P341 is controlled by a single-chip microcomputer and outputs a low level to turn on the IGBT test unit.

[0079] The current direction of one of the IGBT1s is: +5V 2.2K ohm current-limiting resistor ( Figure 5 R81 in Figure 5For the P2.2 pin of the single-chip microcomputer in R45), a loop is formed inside the single-chip microcomputer to GND, the light-emitting diode inside the optocoupler chip P341 emits light, and the secondary side conducts.

[0080] The conducting loop is as follows: +15V1 - 1-ohm current-limiting resistor ( Figure 5 R52 in it) - the G1 terminal of the IGBT test unit (the 2nd terminal of the IGBT test plug) - inside the IGBT (the 3rd terminal of the IGBT plug) - +15V1GND forms a loop, and IGBT1 conducts.

[0081] The turn-off loop of IGBT1 is as follows: The P2.2 pin of the single-chip microcomputer outputs a high level, the optocoupler chip P341 cannot form a loop, and the optocoupler chip P341 is in the cut-off state.

[0082] The turn-off loop of the IGBT is as follows: -9V1 - inside the IGBT1 - +15V1GND forms a negative voltage turn-off loop.

[0083] The turn-on and turn-off loops of IGBT2 are the same as those of IGBT1. Figure 5 There are 2 anti-parallel 15V zener diodes ( Figure 5 DZ2 and DZ3 in it) play a role in clamping and voltage stabilization, protecting the conduction voltage of the IGBT from exceeding 15.6V, and the IGBT discharge resistor releases the energy of the IGBT when it is turned off. If testing the high-speed conduction state of the IGBT, the single-chip microcomputer outputs a PWM wave, and the high-frequency signal drives the IGBT board, and the IGBT conducts at high speed. Externally, the IGBT uses the form of 24V in series with an LED lamp to observe the corresponding conduction and cut-off signals.

[0084] Actually, in order to ensure that the IGBT test unit can perform tests more efficiently, there is also an IGBT3 turn-on and turn-off loop in the test circuit, including the chip HCPL-316J. The IGBT3 loop also includes resistor R1 and resistor R82. The first end of resistor R1 is electrically connected to pins 1, 3, and 7 of the chip HCPL-316J respectively, the second end of resistor R1 is electrically connected to pin 5 of the chip HCPL-316J, the first end of resistor R82 is electrically connected to pin 2 of the chip HCPL-316J, and the second end of resistor R82 is electrically connected to the ground terminal and pin 4 of the chip HCPL-316J respectively.

[0085] IGBT3 also includes a plug JP2 and a plug JP14. The IGBT3 loop also includes a capacitor C21, a resistor R2, a resistor R84, a diode D3, and a diode D6. The first end of the capacitor C21 is electrically connected to the 16th pin of the chip HCPL-316J and the 1st pin of the plug JP2. The second end of the capacitor C21 is electrically connected to the 14th pin of the chip HCPL-316J and the first end of the resistor R2. The first end of the resistor R84 is electrically connected to the second end of the resistor R2. The first end of the diode D3 is electrically connected to the 2nd pin of the plug JP2. The second end of the diode D3 is electrically connected to the second end of the resistor R84 and the first end of the diode D6. The second end of the diode D6 is electrically connected to the 1st pin of the plug JP14.

[0086] The IGBT loop also includes a resistor R83, a capacitor C22, a triode Q19, a triode Q20, and a resistor R88, a resistor R92, and a diode DZ1. The first end of the resistor R83 is electrically connected to the 11th pin of the chip HCPL-316J. The second end of the resistor R83 is electrically connected to the first end of the capacitor C22. The first end of the capacitor C22 is also electrically connected to the base of the triode Q19 and the base of the triode Q20. The second end of the capacitor C22 is electrically connected to the 9th pin of the chip HCPL-316J, the 10th pin of the HCPL-316J, and the collector of the triode Q20. The emitter of the triode Q19 is electrically connected to the first end of the resistor R88 and the emitter of the triode Q20. The collector of the triode Q20 is also electrically connected to the 4th pin of the plug JP14. The second end of the resistor R88 is electrically connected to the first end of the resistor R92, the first end of the diode DZ1, and the 2nd pin of the plug JP14. The second end of the resistor R92 is electrically connected to the second end of the diode DZ1 and the 3rd pin of the plug JP14. The second end of the diode DZ1 is also electrically connected to the 3rd pin of the plug JP14.

[0087] The schematic diagram of the IGBT test is as Figure 6 shown. For IGBT trigger 1, the red clip of the resistance test clip is clipped to the IGBT module 1, and the black clip is clipped to No. 3. If the black clip is clipped to the corresponding UVW output line on the frequency converter, and then the IGBT trigger contact is correspondingly plugged into the corresponding IGBT plug, and the trigger 1 start button is pressed on the touch screen, the indicator light will light up at this time. Then press the trigger 1 stop button, and the indicator light will go out, proving that the IGBT is normal. The IGBT trigger 2 is similar to the above, except that the trigger 2 start button is pressed, the red clip is clipped to the IGBT module No. 3, and the black clip is clipped to No. 1.

[0088] In another specific embodiment of the present application, as Figure 1As shown, the above current transformer test unit 40 includes a voltage conversion module 410 and an isolation module 420. The voltage conversion module 410 is used to convert the power supply voltage and perform voltage division processing on the power supply voltage. The isolation module 420 is electrically connected to the above voltage conversion module 410 and is used to isolate the interference signals of the above voltage conversion module 410. In this embodiment, through the voltage conversion module and the isolation module, the current transformer of the frequency converter can be tested more efficiently.

[0089] In another specific embodiment of the present application, as Figure 1 shown, the above voltage conversion module 410 includes a second relay sub-module 4101, a second switch sub-module 4102, and a sixth resistor sub-module 4103. The second relay sub-module 4101 is used to be electrically connected to the current transformer of the above frequency converter. The second switch sub-module 4102 is electrically connected to the above second relay sub-module 4101 and is used to control the conduction or disconnection of the above second relay sub-module 4101. The sixth resistor sub-module 4103 is electrically connected to the above second switch sub-module 4102 and is used to perform voltage division processing on the power supply voltage. The above isolation module 420 includes a second isolation sub-module 4201, the above seventh resistor sub-module 4202, and a third diode sub-module 4203. The second isolation sub-module 4201 is electrically connected to the above sixth resistor sub-module 4103 and is used to isolate the above sixth resistor sub-module 4103 and the seventh resistor sub-module 4202. The above seventh resistor sub-module 4202 is electrically connected to the above second isolation sub-module 4201. The third diode sub-module 4203 is electrically connected to the above seventh resistor sub-module 4202 and is used for clamping and voltage stabilization. In this embodiment, through the second relay sub-module, the second switch sub-module, the sixth resistor sub-module, the second isolation sub-module, the above seventh resistor sub-module, and the third diode sub-module, the current transformer of the frequency converter can be tested further efficiently.

[0090] Specifically, as Figure 7 shown, the second relay sub-module includes relays J1, J2, and J3. The second switch sub-module includes switches JK1, JK2, and JK3. The sixth resistor sub-module includes resistors R8, R20, R13, and capacitor C4. The second isolation sub-module includes U1A. The seventh resistor sub-module includes resistor R14. The third diode sub-module includes capacitor C5, diodes D7, and D9. Among them, each relay is respectively electrically connected to the control chip U3, and the control chip U3 is electrically connected to the pull-up resistor R28.

[0091] Under normal circumstances, when there is no current output from the current transformer of the frequency converter, the output voltage is half of the supply voltage. If the supply voltage is 5V, the output should be 2.5V. If it is higher or lower than 2.5V, it indicates that the corresponding current transformer is damaged. The core of the above current transformer test unit is the isolation chip LM358( Figure 7 U1A in Figure 7 ). The operational amplifier is the core to form a voltage conversion module, which transmits the corresponding voltage signal to the single-chip microcomputer. Under static conditions, a 2.5V reference voltage is output. If it is lower or higher than this voltage, the current transformer is damaged. Under dynamic conditions, the corresponding voltage will be displayed accordingly, otherwise the current transformer is damaged. The switching of the 3-way current transformer test relies on 3 relays for switching. For example: the current transformer of phase A current - terminal 2 of the current transformer plug - the signal of the current transformer passes through the relay - the common terminal of the relay - 1K ohm( Figure 7 R8 in Figure 7 and 10K ohm voltage division( Figure 7 R20 in Figure 7 )(the voltage - dividing resistors( Figure 7 R8 and R20 in

[0092] convert the current signal of the current transformer into a small voltage signal) - 1K ohm current - limiting resistor( Figure 8 R13 in

[0093] to the isolation of the operational amplifier of the isolation chip LM358 - 1K ohm current - limiting resistor( Figure 1 14 in

[0094] In another alternative embodiment of the present application, as shown in Figure 1 In an optional embodiment of the present application, as shown in Figure 1 shown, the above - mentioned fan test unit 50 includes a first conduction module 510, and the first conduction module 510 is used to drive the voltage output to the fan of the above - mentioned frequency converter. In this embodiment, through the first conduction module, the voltage output to the fan of the frequency converter can be controlled, and thus the fan of the frequency converter can be tested more efficiently.

[0094] In another alternative embodiment of the present application, as shown in Figure 1As shown, the above-mentioned first conduction module 510 includes a second triode sub-module 5101, an eighth resistor sub-module 5102, a key sub-module 5103, a ninth resistor sub-module 5104, and a third triode sub-module 5105. The second triode sub-module 5101 is electrically connected to the above-mentioned pressure test unit and is used to drive the voltage output to the fan of the above-mentioned frequency converter; the eighth resistor sub-module 5102 is electrically connected to the above-mentioned second triode sub-module 5101; the key sub-module 5103 is electrically connected to the above-mentioned eighth resistor sub-module 5102 and is used to receive a predetermined operation. When the above-mentioned predetermined operation is received, the above-mentioned second triode sub-module 5101 is turned on; the ninth resistor sub-module 5104 is electrically connected to the above-mentioned second triode sub-module 5101; the third triode sub-module 5105 is electrically connected to the above-mentioned ninth resistor sub-module 5104 and is used to drive the voltage output to the fan of the above-mentioned frequency converter. In this embodiment, the fan of the frequency converter can be further efficiently tested through the second triode sub-module, the eighth resistor sub-module, the key sub-module, the ninth resistor sub-module, and the third triode sub-module.

[0095] Specifically, as Figure 9 shown, the second triode sub-module includes triode Q1, resistor R4, and triode Q2. The second triode sub-module further includes triode Q3, resistor R5, and triode Q4. The eighth resistor sub-module includes resistor R69 and resistor R7. The eighth resistor sub-module further includes R72 and resistor R10. The key sub-module includes keys SW1 and SW2. The ninth resistor sub-module includes resistor 21, resistor R77, and resistor R22. The third triode sub-module includes triode Q8.

[0096] The principle of small fan testing is as follows: 24VVCC - the collector of triode TIP41C - the emitter of triode TIP41C - small fan test plug - small fan - GND form a loop.

[0097] The control loop of triode TIP41C is as follows: small fan control button (or the output of the low level of the P2.1 pin of the single-chip microcomputer) - +5V1 through the emitter and base of triode S9015 - 1K ohm current-limiting resistor ( Figure 9 R4 in Figure 9 ) - small fan control button to GND, forming a loop, +5V1 - the emitter of triode S9015 - the collector of triode S9015 - 1K current-limiting resistor ( Figure 9The pull-up resistor in R77) causes the base current of the triode S9015 to disappear. The triode S9015 is in the off state, the triode TIP41C is cut off, the small fan loses 24V voltage, and the small fan stops running. Figure 9 On the left side in, Q1, R4, Q2, R69, R7, SW1, and JP3 are used to test the small fan. JP3 is the plug of the small fan test line. Figure 9 On the right side in, Q3, R5, Q4, R72, R10, SW2, and JP9 are used to test the large fan. JP9 is the plug of the large fan test line. JP7 is the plug of the single-chip microcomputer signal.

[0098] In another optional embodiment of the present application, as Figure 1 shown, the above-mentioned first start-stop test unit 60 includes a first start module 610 and a second drive module 620. The first start module 610 is electrically connected to the above-mentioned pressure test unit; the second drive module 620 is electrically connected to the first start module 610 and is used to drive the above-mentioned frequency converter to work. In this embodiment, through the first start module and the second drive module, the start test and stop test of the frequency converter can be carried out more efficiently.

[0099] In still another optional embodiment of the present application, as Figure 1 shown, the above-mentioned first start module 610 includes a plurality of third relay sub-modules 6101 and a plurality of third switch sub-modules 6102. The plurality of third relay sub-modules 6101 are electrically connected to the above-mentioned pressure test unit; one of the above-mentioned third switch sub-modules 6102 is electrically connected to one of the above-mentioned third relay sub-modules 6101 and is used to control the conduction or disconnection of the above-mentioned third relay sub-module 6101; the above-mentioned second drive module 620 includes a tenth resistor sub-module 6201, a fourth triode sub-module 6202, and a drive sub-module 6203. The tenth resistor sub-module 6201 is electrically connected to the above-mentioned third relay sub-module 6101; the fourth triode sub-module 6202 is electrically connected to the tenth resistor sub-module 6201 and is used to drive and output a drive signal to the above-mentioned frequency converter; the drive sub-module 6203 is used to be electrically connected to the above-mentioned frequency converter and is also electrically connected to the tenth resistor sub-module 6201 and the fourth triode sub-module 6202 and is used to output the drive signal to the above-mentioned frequency converter. In this embodiment, through the plurality of third relay sub-modules, the plurality of third switch sub-modules, the tenth resistor sub-module, the fourth triode sub-module, and the drive sub-module, the start test and stop test of the frequency converter can be further carried out efficiently.

[0100] Specifically, as Figure 10As shown, the third relay sub-module includes a pull-up resistor bank R2103, a driver chip U5, relays J11, J12, J13, J14, and J15. The third switch sub-module includes switches JK1, JK2, JK3, JK4, and JK5. The third switch sub-module further includes a plug JP12. The plug JP12 is used to connect to the frequency converter. The plug JP112 is also electrically connected to a resistor R56 and a diode LED4. The diode LED4 is an external drive 24V indicator light. The tenth resistor sub-module includes a diode D28, resistors R104 and R105. The fourth triode sub-module includes a triode Q9. The drive sub-module includes a relay drive signal line Port.

[0101] By designing the combination of the single-chip microcomputer and the peripheral buttons, the start, stop, online, and multi-speed start test of the frequency converter can be controlled. Through the internal output of 5 relays ( Figure 10 J11, J12, J13, J14, J15 in it), the corresponding start and stop of the frequency converter are respectively controlled. Connected to the frequency converter through the plug, the start, stop, and multi-speed start of the frequency converter are controlled, and the corresponding functions are corresponding according to the settings of the frequency converter.

[0102] The schematic diagram of the test of the first start-stop test unit is as Figure 11 shown. The first start-stop test unit includes a 12-core plug, which are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 respectively. Plug 1 corresponds to line 35# and DI1 terminal. Plug 2 corresponds to line 34# and DI2 terminal. Plug 3 corresponds to line 36# and DI3 terminal. Plug 4 corresponds to line 37# and DI4 terminal. Plug 5 corresponds to line 38# and DI5 terminal. Plug 6 corresponds to line 39# and DI6 terminal. Plug 8 corresponds to line 43# and the ground terminal. Plug 9 corresponds to line 44# and the temperature sensor terminal. Plug 11 corresponds to line 42# and the 24V power supply terminal. Plug 12 corresponds to line 43# and the ground terminal. Multiple buttons are also provided, which are JK11, JK12, JK13, JK14, HS2, and HS3 respectively, corresponding to different lines, and there is also a port for connecting the temperature sensor. The 24V port is connected to the inside of the frequency converter body through a resistor.

[0103] In another embodiment of the present application, as Figure 1 shown, the above-mentioned second start-stop test unit 70 includes an input module 710 and an adjustment module 720. The input module 710 is electrically connected to the above-mentioned pressure test unit; the adjustment module 720 is electrically connected to the above-mentioned input module 710 and is used to adjust the current signal output to the above-mentioned frequency converter. In this embodiment, through the input module and the adjustment module, the start test and stop test of the frequency converter can be carried out more efficiently through the input current signal.

[0104] In another embodiment of the present application, as Figure 1 shown, the above input module 710 includes a third control sub-module 7101, and the third control sub-module 7101 is used to output a current signal; the above adjustment module 720 includes a fifth triode sub-module 7201, an eleventh resistor sub-module 7202 and a fourth relay sub-module 7203. The fifth triode sub-module 7201 is electrically connected to the above third control sub-module 7101 and is used to control the current signal output to the frequency converter; the eleventh resistor sub-module 7202 is electrically connected to the above fifth triode sub-module 7201; the fourth relay sub-module 7203 is electrically connected to the above eleventh resistor sub-module 7202 and is used to adjust the current signal output to the above frequency converter. In this embodiment, through the third control sub-module, the fifth triode sub-module, the eleventh resistor sub-module and the fourth relay sub-module, the start test and stop test of the frequency converter can be further efficiently performed through the input current signal.

[0105] Specifically, as Figure 12 shown, the third control sub-module includes a relay control input terminal JK2B (the 3rd pin is used to connect the PWM signal line output by the single-chip microcomputer), a control chip U7 (GP8102) and a capacitor E7. The fifth triode sub-module includes a triode Q15, a capacitor E8 (energy storage capacitor) and a resistor R41. The eleventh resistor sub-module includes resistors R58, R59, R61, R67, a capacitor E9 and a diode D17. The fourth relay sub-module includes a control chip U8 (adjustment operational amplifier chip LM321), resistors R62, R63, a capacitor C20, a relay control output terminal JK7C and a plug JP8. Figure 12 JK7A in

[0106] is a control output relay and is electrically connected to the first start-stop test unit.

[0107] The core of the second start-stop test unit is the chip LM321 and the chip GP8102. With these two chips as the core, a 4-20 mA signal is output to drive the start and stop of the corresponding test units of the frequency converter. A relay is used to control the PWM signal input by the single-chip microcomputer and the 4-20 mA signal output to ensure the safety of the circuit board when the 4-20 mA output is not used.

[0107] The circuit loop of the second start-stop test unit is as follows: The normally open point of the relay outputs the corresponding current signal to the input terminal and output terminal of the chip GP8102 to drive the triode Q15. After there is a current signal at the base of the triode Q15, the collector and emitter of the triode Q15 are turned on. 24V VCC - the collector of the triode Q15 - the emitter of the triode Q15 - a 250-ohm resistor ( Figure 12 R61 in Figure 12The R67) in it — normally open contact of the relay — 4 - 20 mA plug, outputting 4 - 20 mA signal.

[0108] The second start / stop test unit is also provided with a diode clamping circuit to ensure the safety of the output. The voltage stabilization and regulation circuit is 24V VCC — the collector of triode Q15 — the emitter of triode Q15 — two 1M ohm resistors ( Figure 12 R58 and R59 in it) are connected in series to GND, and a signal is taken from between the two 1M ohm resistors ( Figure 12 R62 and R63 in it) — 4 - 20 mA regulating operational amplifier to ensure the stability of the 4 - 20 mA output.

[0109] When the single - chip microcomputer outputs a PWM signal, the schematic diagram of the chip corresponding to the output of 4 - 20 mA is as Figure 13 shown. The principle of the test of the second start / stop test unit is as Figure 14 shown. The red test line and the black test line are both connected to the main body of the frequency converter, and the 0 - 20 mA page sliding slider outputs a 0 - 20 mA signal.

[0110] In another embodiment of the present application, as Figure 1 shown, the above - mentioned thyristor conduction test unit 80 includes a second conduction module 810. The second conduction module 810 is electrically connected to the above - mentioned pressure test unit and is used to drive the voltage output to the thyristor of the above - mentioned frequency converter. In this embodiment, through the second conduction module, the thyristor of the frequency converter can be tested more efficiently.

[0111] In yet another embodiment of the present application, as Figure 1 shown, the above - mentioned second conduction module 810 includes a sixth triode sub - module 8101, a twelfth resistor sub - module 8102, a seventh triode sub - module 8103, a thirteenth resistor sub - module 8104, and an output sub - module 8105. The sixth triode sub - module 8101 is electrically connected to the above - mentioned pressure test unit; the twelfth resistor sub - module 8102 is electrically connected to the above - mentioned sixth triode sub - module 8101; the seventh triode sub - module 8103 is electrically connected to the above - mentioned twelfth resistor sub - module 8102; the thirteenth resistor sub - module 8104 is electrically connected to the above - mentioned seventh triode sub - module 8103; the output sub - module 8105 is electrically connected to the above - mentioned thirteenth resistor sub - module 8104 and is used to output voltage to the thyristor of the above - mentioned frequency converter. In this embodiment, through the sixth triode sub - module, the twelfth resistor sub - module, the seventh triode sub - module, the thirteenth resistor sub - module, and the output sub - module, the thyristor of the frequency converter can be tested further efficiently.

[0112] Specifically, as Figure 15As shown, the sixth triode sub-module includes a fuse F4 and a triode Q10, the twelfth resistor sub-module includes a resistor R29, the seventh triode sub-module includes a triode Q11, a resistor R79, and a resistor R30, the thirteenth resistor sub-module includes resistors R15, R11, R31, and R34, the output sub-module includes a control trigger current resistor selection jumper cap JP10, a diode LED3, and an external trigger terminal JP11, and P3.2 / INTO is connected to the single-chip microcomputer control pin.

[0113] The thyristor conduction test unit can test the thyristor of the frequency converter by using a single-chip microcomputer, a triode Q10, and a method of changing the resistance value. The single-chip microcomputer P3.2 outputs a low level, +5V - the emitter of triode Q11 - the base of triode Q11 - a 1k ohm current-limiting resistor ( Figure 15 R30 in it) - inside the single-chip microcomputer - GND, triode Q11 conducts, +5V - the emitter of triode Q11 - the collector of triode Q11 - triode Q10 conducts. VCC3.7V - 3A fuse - triode Q10 - divides into two paths (3 68 ohm ( Figure 15 R15, R11, and R31 in it) in parallel) - output terminal JP11 - thyristor trigger test plug JP10 - thyristor trigger pole - GND.

[0114] The principle of the thyristor conduction test unit test is as Figure 16 shown. The thyristor trigger plug corresponds to the black wire and the white wire of the thyristor conduction test unit. Clip the red clip (red test clip) of the starting resistance test to 1# (corresponding to the UVW input terminal of the corresponding end), and the black clip (black test clip) to the 2 / 4 terminal (corresponding to the + end of the main capacitor of the frequency converter). Press the 4V start button and the thyristor trigger button. If the indicator light is on, it means the thyristor of the frequency converter is normal.

[0115] In a specific embodiment of the present application, as Figure 1 shown, the above-mentioned starting resistance test unit 90 includes a third conduction module 910 and a second starting module 920. The third conduction module 910 is electrically connected to the above-mentioned pressure test unit and is used to drive the voltage output to the starting resistance of the above-mentioned frequency converter; the second starting module 920 is electrically connected to the above-mentioned third conduction module 910 and is also used to be electrically connected to the starting resistance of the above-mentioned frequency converter. In this embodiment, through the third conduction module and the second starting module, the starting resistance of the frequency converter can be tested more efficiently.

[0116] In another specific embodiment of the present application, as Figure 1As shown in the figure, the above-mentioned third conduction module 910 includes a fourth diode sub-module 9101 and a fifteenth resistor sub-module 9102. The fourth diode sub-module 9101 is electrically connected to the above-mentioned third conduction module 910 for clamping and voltage stabilization. The fifteenth resistor sub-module 9102 is electrically connected to the fourth diode sub-module 9101. The above-mentioned second startup module 920 includes an eighth triode sub-module 9201, a fourteenth resistor sub-module 9202, and a ninth triode sub-module 9203. The eighth triode sub-module 9201 is electrically connected to the above-mentioned pressure test unit. The fourteenth resistor sub-module 9202 is electrically connected to the eighth triode sub-module 9201. The ninth triode sub-module 9203 is electrically connected to the fourteenth resistor sub-module 9202. In this embodiment, through the eighth triode sub-module, the fourteenth resistor sub-module, the ninth triode sub-module, the fourth diode sub-module, and the fifteenth resistor sub-module, the startup resistor of the frequency converter can be further efficiently tested.

[0117] Specifically, as Figure 17 shown, the eighth triode sub-module includes diode D5, diode LED2, and triode Q6. The fourteenth resistor sub-module includes resistor R12. The ninth triode sub-module includes triode Q7, resistor R73, resistor R16, and button SW11. The second startup module further includes a startup resistor test plug. The fourth diode sub-module includes diode D4 and diode LED1 (thyristor AK conduction signal indicator light). The fifteenth resistor sub-module includes resistor R9. The third conduction module further includes a thyristor conduction AK plug. P2.0 is connected to the single-chip microcomputer control pin.

[0118] The startup resistor test unit can test the startup resistor of the frequency converter and observe the conduction and cutoff of the corresponding circuit by the single-chip microcomputer, triode Q6, and the way of changing the resistance value. The single-chip microcomputer P2.0 outputs a low level, +5V1 - the emitter of triode Q7 - the base of triode Q7 - 1k ohm current-limiting resistor ( Figure 17 R16 in

[0119] the figure) - inside the single-chip microcomputer - GND. Triode Q7 conducts, +5V - the emitter of triode Q7 - the collector of triode Q7 - triode Q6 conducts. 24VCC - diode D5 - diode LED2 - triode Q6 - startup resistor test plug JP5 - startup resistor - GND. The light-emitting diode LED2 emits light, indicating that the startup resistor is good. The light-emitting diode does not emit light, indicating that the startup resistor is damaged. Figure 18 shown, press the 4V button, and clamp the red clip (red test clip) and the black clip (black test clip) on the resistor to be tested. The indicator light is on, indicating that the startup resistor of the frequency converter is good.

[0120] In order to make it more convenient for the staff to view, in another embodiment of the present application, the above detection device further includes a display component, which is electrically connected to the above detection circuit and is used to display the above detection result of the above detection circuit.

[0121] In a specific embodiment, the detection device of the frequency converter further includes a plug, as Figure 19 shown, including plug JP20 and plug JP18. Plug JP20 is the external output power supply pin. The 2nd pin of JP20 outputs -9V2 (IGBT2 turn-off voltage), the 3rd pin is +15V2GND (the common terminal of IGBT2 drive), the 4th pin is +15V2 (the turn-on voltage of IGBT2), the 5th pin is -5V1 (the negative working voltage of the operational amplifier chip LM321), the 6th pin is +5V1GND (the common terminal for supplying power to the operational amplifier chip LM321), the 7th pin is +5V1 (the positive working voltage of the operational amplifier chip LM321), the 8th pin is -12V1 (the -12V terminal of the + - 12V power supply chip), the 9th pin is +12VGND (the common terminal of the + - 12V power supply chip), and the 10th pin is 24V1VCC (the 24V1+ terminal for outputting to the external 24V device).

[0122] Plug JP18 is the external output power supply pin. The 1st pin of JP18 is the GND terminal (the common terminal of the input and output 3.7V), the 2nd pin is +15V1GND (the common terminal of the IGBT1 drive voltage), the 3rd pin is +15V1 (the positive voltage of the IGBT1 drive output), the 4th pin is VCC3.7Vin (the input terminal of the 3.7V lithium battery), the 5th pin is VCC3.7V (the 3.7V voltage output externally after passing through the circuit board), the 6th pin is VCC12Vin (the input terminal of the 12V lithium battery), the 7th pin is VCC12V (the 12V output externally after passing through the circuit board), the 8th pin is 24VCC (the input terminal of the 5V power supply), the 9th pin is VCC24V01 (the 24V terminal output externally by the switching power supply), and the 10th pin is the input terminal of the 24V lithium battery.

[0123] Another path is the 5V power supply terminal loop as follows: 24V - fuse F2 - LM2596 - 5V (the IC1 in the Figure 19 DCDC buck chip) - diode D1 - inductor L1 - capacitor E2 - capacitor C1_capacitor C2. Through these components, the 24V is converted into 5V voltage. The resistor R33 and the diode LED5 are the 5V power supply indicators (to observe whether there is 5V power).

[0124] In the above embodiments of the present invention, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0125] In several embodiments provided by the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the above-mentioned unit division can be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of units or modules can be in electrical or other forms.

[0126] The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0127] In addition, each functional unit in various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0128] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: USB flash drives, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), mobile hard disks, magnetic disks, or optical disks and other various media that can store program codes.

[0129] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0130] The detection device of the frequency converter of the present application designs a detection circuit. Through the detection circuit, various components of the frequency converter can be detected, ensuring that the faults of the frequency converter can be detected quickly and conveniently. The detection device of this solution can help maintenance personnel quickly judge the faults without replacing a new frequency converter, reducing the cost.

[0131] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A detection device for a frequency converter, characterized in that, Including: A detection circuit, including a switching power supply unit, a pressure test unit, and an IGBT test unit. The detection circuit is used to be electrically connected to the frequency converter, and is used to detect the frequency converter and generate a detection result. Among them, the pressure test unit is electrically connected to the switching power supply unit and the IGBT test unit respectively. The switching power supply unit is used to provide power for the detection device. The pressure test unit is used to control the output test voltage. The IGBT test unit is used to detect the IGBT board of the frequency converter. The detection circuit further includes a current transformer test unit, a fan test unit, a first start / stop test unit, a second start / stop test unit, a thyristor conduction test unit, and a starting resistor test unit. Among them, the pressure test unit is electrically connected to the current transformer test unit, the fan test unit, the first start / stop test unit, the second start / stop test unit, the thyristor conduction test unit, and the starting resistor test unit respectively. The current transformer test unit is used to detect the current transformer of the frequency converter. The fan test unit is used to detect the fan of the frequency converter. The first start / stop test unit is used to control the start and pause of the detection process. The second start / stop test unit is used to control the start and pause of the detection process using a target signal. The thyristor conduction test unit is used to detect the thyristor of the frequency converter. The starting resistor test unit is used to detect the starting resistor of the frequency converter.

2. The detection device according to claim 1, wherein The switching power supply unit includes: A power module, used to input a voltage signal, process the voltage signal, and output the processed voltage signal. A pulse width control module, electrically connected to the power module, used to control the switch conduction pulse width according to the processed voltage signal.

3. The detection device according to claim 2, wherein The power module includes: A first voltage transformation sub-module, used to perform voltage transformation processing on the input voltage signal. A filtering sub-module, electrically connected to the first voltage transformation sub-module, used to perform filtering processing on the voltage signal after voltage transformation processing to obtain the processed voltage signal. The pulse width control module includes: A first switch sub-module, electrically connected to the filtering sub-module, used to control the switch conduction according to the processed voltage signal. A first control sub-module, electrically connected to the first switch sub-module, used to control the duty cycle of the output signal of the first switch sub-module according to the processed voltage signal.

4. The detection device according to claim 1, characterized in that, The pressure test unit includes: A pressure test loop module, used to generate a self-excited oscillation signal. An output voltage sampling module, electrically connected to the pressure test loop module, used to generate a test voltage signal according to the self-excited oscillation signal.

5. The detection device according to claim 4, wherein The pressure test loop module includes: A second control sub-module, used to generate a control signal. A frequency generation sub-module, electrically connected to the second control sub-module, used to generate the self-excited oscillation signal according to the control signal. A first resistor sub-module, electrically connected to the frequency generation sub-module. The first triode sub-module is electrically connected to the first resistor sub-module; The second transformer sub-module is electrically connected to the first triode sub-module and is used for transforming the self-excited oscillation signal; The first diode sub-module is electrically connected to the second transformer sub-module; The output voltage sampling module includes: The second resistor sub-module is electrically connected to the first diode sub-module; The first isolation sub-module is connected to the second resistor sub-module and is used for isolating the second control sub-module and the first relay sub-module; The first relay sub-module is electrically connected to the first isolation sub-module and is used for closing or opening according to the control signal of the second control sub-module.

6. The detection device according to claim 1, characterized in that, The IGBT test unit includes: The first drive module is used for generating a drive signal; The voltage stabilization module is electrically connected to the first drive module and is used for protecting the frequency converter from being broken down.

7. The detection device according to claim 6, wherein The first drive module includes: The third resistor sub-module is electrically connected to the pressure test unit; The optocoupler sub-module is electrically connected to the third resistor sub-module and is used for generating a drive signal; The fourth resistor sub-module is electrically connected to the optocoupler sub-module; The voltage stabilization module includes: The second diode sub-module is electrically connected to the fourth resistor sub-module and is used for clamping voltage for stabilization; The fifth resistor sub-module is electrically connected to the second diode sub-module and is used for releasing the energy of the IGBT test unit when the frequency converter is turned off.

8. The detection device according to claim 1, wherein The current transformer test unit includes: The voltage conversion module is used for converting the supply voltage and performing voltage division processing on the supply voltage; The isolation module is electrically connected to the voltage conversion module and is used for isolating the interference signal of the voltage conversion module.

9. The detection device according to claim 8, wherein The voltage conversion module includes: The second relay sub-module is used for being electrically connected to the current transformer of the frequency converter; The second switch sub-module is electrically connected to the second relay sub-module and is used for controlling the conduction or disconnection of the second relay sub-module; The sixth resistor sub-module is electrically connected to the second switch sub-module and is used for performing voltage division processing on the supply voltage; The isolation module includes: The second isolation sub-module is electrically connected to the sixth resistor sub-module and is used for isolating the sixth resistor sub-module and the seventh resistor sub-module; The seventh resistor sub-module is electrically connected to the second isolation sub-module; The third diode sub-module is electrically connected to the seventh resistor sub-module and is used for clamping voltage for stabilization.

10. The detection device according to claim 1, characterized in that The fan test unit includes: The first conduction module is used for driving and outputting the voltage to the fan of the frequency converter.

11. The detection device according to claim 10, wherein, The first conduction module includes: The second triode sub-module is electrically connected to the pressure test unit and is used for driving and outputting the voltage to the fan of the frequency converter; The eighth resistor sub-module is electrically connected to the second triode sub-module; The key sub-module is electrically connected to the eighth resistor sub-module and is used for receiving a predetermined operation. When the predetermined operation is received, the second triode sub-module conducts; The ninth resistor sub-module is electrically connected to the second triode sub-module; The third triode sub-module, electrically connected to the ninth resistor sub-module, is used to drive and output the voltage to the fan of the frequency converter.

12. The detection device according to claim 1, characterized in that The first start-stop test unit includes: The first start module, electrically connected to the pressure test unit; The second drive module, electrically connected to the first start module, is used to drive the frequency converter to work.

13. The detection device according to claim 12, characterized in that The first start module includes: A plurality of third relay sub-modules, electrically connected to the pressure test unit; A plurality of third switch sub-modules, one of the third switch sub-modules is electrically connected to one of the third relay sub-modules, and is used to control the third relay sub-module to conduct or disconnect; The second drive module includes: The tenth resistor sub-module, electrically connected to the third relay sub-module; The fourth triode sub-module, electrically connected to the tenth resistor sub-module, is used to drive and output the drive signal to the frequency converter; The drive sub-module is used to be electrically connected to the frequency converter, and is also electrically connected to the tenth resistor sub-module and the fourth triode sub-module, and is used to output the drive signal to the frequency converter.

14. The detection device according to claim 1, wherein, The second start-stop test unit includes: The input module, electrically connected to the pressure test unit; The adjustment module, electrically connected to the input module, is used to adjust the current signal output to the frequency converter.

15. The detection device according to claim 14, characterized in that The input module includes: The third control sub-module is used to output a current signal; The adjustment module includes: The fifth triode sub-module, electrically connected to the third control sub-module, is used to control the current signal output to the frequency converter; The eleventh resistor sub-module, electrically connected to the fifth triode sub-module; The fourth relay sub-module, electrically connected to the eleventh resistor sub-module, is used to adjust the current signal output to the frequency converter.

16. The detection device according to claim 1, characterized in that The thyristor conduction test unit includes: The second conduction module, electrically connected to the pressure test unit, is used to drive and output the voltage to the thyristor of the frequency converter; 17. The detection device according to claim 16, characterized in that, The second conduction module includes: The sixth triode sub-module, electrically connected to the pressure test unit; The twelfth resistor sub-module, electrically connected to the sixth triode sub-module; The seventh triode sub-module, electrically connected to the twelfth resistor sub-module; The thirteenth resistor sub-module, electrically connected to the seventh triode sub-module; The output sub-module, electrically connected to the thirteenth resistor sub-module, is used to output voltage to the thyristor of the frequency converter.

18. The detection device according to claim 1, characterized in that, The starting resistor test unit includes: The third conduction module, electrically connected to the pressure test unit, is used to drive and output the voltage to the starting resistor of the frequency converter; The second start module, electrically connected to the third conduction module, is also used to be electrically connected to the starting resistor of the frequency converter.

19. The detection device according to claim 18, characterized in that The third conduction module includes: The fourth diode sub-module, electrically connected to the third conduction module, is used for clamping and voltage stabilization; The fifteenth resistor sub-module, electrically connected to the fourth diode sub-module; The second start module includes: The eighth triode sub-module, electrically connected to the pressure test unit; The fourteenth resistor sub-module, electrically connected to the eighth triode sub-module; The ninth triode sub-module, electrically connected to the fourteenth resistor sub-module.

20. The detection device according to any one of claims 1 to 19, characterized in that The detection device further includes: A display component, electrically connected to the detection circuit for displaying the detection result of the detection circuit.

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