An EBM fan tester

Abstract

The present invention relates to the field of EBM fan diagnostic equipment, and discloses an EBM fan tester, which includes a processor, a power supply circuit, a fan drive circuit, a speed detection circuit, a current detection circuit, a voltage detection circuit, a storage circuit, a display circuit and a data transmission circuit. The power supply circuit provides a stable power supply, the storage circuit is used to store data, the display circuit is used to display the detection result, and the data transmission circuit is used to exchange data. When in use, the EBM fan is connected. The processor sends a PWM control signal to the drive circuit to drive the EBM fan to work. When the EBM fan is working, the speed detection circuit, the current detection circuit and the voltage detection circuit respectively detect the current speed, current and voltage of the EBM fan and transmit the data to the processor. The display screen displays the current data. When the EBM fan tester detects the fan, it only needs to connect the fan to the circuit. It reduces the wiring operation, reduces the connection error rate, and ensures the detection quality and efficiency.

Description

Technical Field

[0001] The present invention relates to the field of EBM fan diagnostic equipment, and in particular to an EBM fan tester. Background Art

[0002] In the HVDC transmission system, a large number of automation control systems are used to monitor the transmission and transformation devices (or facilities) in real time. As a multi-processor high-performance automation system, SIMATIC TDC is particularly used for process control, rapid response and multi-drive synchronization in large equipment, and is widely used in the control and protection system of HVDC systems around the world. The TDC rack is the hardware platform of its automation control system. The EBM-PAPST axial flow fan is installed on the unit rack to form an air supply and commutation cooling system, which blows air to dissipate heat for the equipment in the rack to ensure long-term continuous operation of the equipment. Failure of the air supply and commutation cooling system will exit the corresponding control and protection system, thereby affecting the safe and stable operation of the HVDC transmission system.

[0003] During operation, the air supply and cooling system sometimes malfunctions. Since there was no corresponding real-time monitoring of the EBM-PAPST axial flow fan in the initial design, it was impossible to determine whether the axial flow fan was faulty when the air supply and cooling system malfunctioned. When the EBM-PAPST axial flow fan was suspected to be faulty, there was a lack of test tools or instruments for power-on measurement of the axial flow fan, which caused great trouble for the diagnosis of the fan.

[0004] In the prior art, the inspector connects an ammeter and a voltmeter to the fan to detect the current and voltage; at the same time, the fan speed is tested by a photoelectric tachometer. The inspector needs to record the data of each test, and then compare and analyze the data after the test is completed to determine whether the fan is faulty. This detection method is complicated and time-consuming. Since it is all manual operation, the detection process is likely to make mistakes, resulting in inaccurate test results. Summary of the invention

[0005] The object of the present invention is to provide an EBM fan tester, which can quickly measure the current, voltage and rotation speed of the EBM fan, so as to facilitate the diagnosis of the fan.

[0006] The embodiment of the present invention is achieved as follows:

[0007] An EBM fan tester is characterized by comprising a processor and a power supply circuit connected to the processor, a fan driving circuit, a speed detection circuit, a current detection circuit, a voltage detection circuit, a storage circuit, a display circuit and a data transmission circuit;

[0008] The power circuit is connected to a battery; the power circuit is used to output the battery voltage stably;

[0009] The power input end of the fan driving circuit is connected to the power output end of the power circuit; the power output end of the fan driving circuit is connected to the power input end of the fan; the control signal input end of the fan driving circuit is connected to the control signal output end of the processor; the fan driving circuit is used to receive the control signal of the processor and output power of different voltages to the fan according to the control signal;

[0010] The signal input end of the speed detection circuit is connected to the negative end of the power input of the fan; the signal output end of the speed detection circuit is connected to the speed signal input end of the processor; the speed detection circuit is used to detect the speed of the fan and transmit the speed signal to the processor;

[0011] The signal output end of the current detection circuit is connected to the current signal input end of the processor; the speed detection circuit is used to detect the current of the fan and transmit the current signal to the processor;

[0012] The signal input end of the voltage detection circuit is connected to the positive power input end of the fan; the signal output end of the voltage detection circuit is connected to the voltage signal input end of the processor; the voltage detection circuit is used to detect the voltage of the fan and transmit the voltage signal to the processor; the data connection end of the storage circuit is connected to the data end of the processor; the storage circuit is used to receive and store data from the processor; the storage circuit can also transmit data to the processor;

[0013] The display circuit includes a display screen; the display signal input terminal of the display screen is connected to the display signal output terminal of the processor; the display circuit is used to receive data from the processor and display it;

[0014] The data connection end of the data transmission circuit is connected to the processor; the data transmission circuit is used to receive data from the processor and transmit it out; the data transmission circuit is also used to receive data from an external device and transmit the data to the processor;

[0015] The processor sends a control signal to the fan drive circuit; the processor is used to receive the speed data of the speed detection circuit, the current data of the current detection circuit, and the voltage data of the voltage detection circuit and analyze the received data; the processor also stores the received data in the storage circuit or sends the data in the storage circuit through the data transmission circuit; the processor also displays the received data through the display circuit;

[0016] The test method of the EBM fan tester includes the following steps:

[0017] S1, the processor sends a control signal to the drive circuit, so that the drive circuit drives the fan with a fixed drive voltage; at the same time, the voltage detection circuit, the speed detection circuit and the current detection circuit transmit the measured voltage, speed and current data to the processor respectively; the processor compares the received voltage, speed and current data with the pre-stored voltage, speed and current data under the corresponding drive voltage and displays the comparison result through the display circuit;

[0018] S2. The processor sends a control signal to enable the driver to drive the fan with multiple different driving voltages; the processor compares the voltage, speed and current data received under different driving voltages with the voltage, speed and current data under the corresponding driving voltages stored in advance and displays the comparison result through the display circuit.

[0019] Further, the voltage detection circuit includes a second inductor (L3) connected to the positive electrode of the fan power supply, and the other end of the second inductor (L3) is connected to the nineteenth resistor (R57); the other end of the nineteenth resistor (R57) is connected to the tenth capacitor (C9), the anode of the third diode (D10), the cathode of the fourth diode (D10-1) and the twentieth resistor (R66); the cathode of the third diode (D10) is connected to the positive electrode of the power supply; the anode of the fourth diode (D10-1), the tenth capacitor (C12), the negative electrode of the seventh polarity capacitor (E12) and the twenty-first resistor (R72) are commonly grounded; the other end of the twentieth resistor (R66), the other end of the tenth capacitor (C12), the other end of the twenty-first resistor (R72) and the positive electrode of the seventh polarity capacitor (E12) are all connected to the signal input positive terminal of the fourth operational amplifier (U2D); the signal input negative terminal and the signal output terminal of the fourth operational amplifier (U2D) are commonly connected to the voltage signal input terminal of the processor;

[0020] The fan drive circuit comprises a first capacitor (R69) having one end connected to the PWM signal output end of the processor, the other end of the first capacitor (R69) being connected to the base of the first triode (Q6) and one end of the second resistor (R75), the other end of the second resistor (R75) and the emitter of the first triode (Q6) being grounded together; the collector of the first triode (Q6) being connected to one end of the third resistor (R70), the other end of the third resistor (R70) being connected to one end of the fourth resistor (R61), one end of the fifth resistor (R76) and one end of the first capacitor (C19), the other end of the fifth resistor (R76) and the other end of the first capacitor (C19) being connected to the gate of the first PMOS tube (Q8), the fourth resistor (R61) being connected to the base of the first triode (Q6) and one end of the second resistor (R75), and the other end of the second resistor (R75) being connected to the emitter of the first triode (Q6). ) and the source of the first PMOS tube (Q8) are connected to the positive electrode of the power supply; the drain of the first PMOS tube (Q8) is connected to the positive electrode of the first polarity capacitor (E21), the positive electrode of the second polarity capacitor (E20), the positive electrode of the third polarity capacitor (E19), the positive electrode of the fourth polarity capacitor (E18), one end of the second capacitor (C19-1) and the positive electrode of the power supply of the fan; the negative electrode of the first polarity capacitor (E21), the negative electrode of the second polarity capacitor (E20), the negative electrode of the third polarity capacitor (E19), the negative electrode of the fourth polarity capacitor (E18), the other end of the second capacitor (C19-1) and one end of the sixth resistor (R40) are grounded; the other end of the sixth resistor (R40) is connected to the negative electrode of the power supply of the fan;

[0021] The speed detection circuit comprises a first inductor (L4) having one end connected to the positive electrode of a fan power supply, the other end of the first inductor (L4) being connected in series with a seventh resistor (R56), the other end of the seventh resistor (R56) being connected to the anode of a first diode (D9), the cathode of a second diode (D9-1), one end of a third capacitor (C4) and the positive signal input end of a first operational amplifier (U11A); the cathode of the first diode (D9) being connected to the positive electrode of the power supply, the anode of the second diode (D9-1) and the other end of the third capacitor (C4) being grounded; the negative signal input end of the first operational amplifier (U11A) being connected to the ninth resistor (R68), the tenth resistor ( R74), the negative power supply terminal of the first operational amplifier (U11A) and the fourth capacitor (C14), the other end of the ninth resistor (R68) is grounded, the other end of the tenth resistor (R74) and the other end of the fourth capacitor (C14) are both connected to the signal output terminal of the first operational amplifier (U11A) and the eleventh resistor (R59); the other end of the eleventh resistor (R59) is connected to the base of the second triode (Q7); the collector of the second triode (Q7) is connected to the twelfth resistor (R60) and the speed signal input terminal of the processor; the other end of the twelfth resistor (R60) is connected to the positive electrode of the power supply; the emitter of the second triode (Q7) is grounded;

[0022] The current detection circuit comprises an eighth resistor (R65); one end of the eighth resistor (R65) is connected to the positive terminal of the signal input of the first operational amplifier (U11A), and the other end is connected to the positive electrode of the fifth polarity capacitor (E8), the thirteenth resistor (R71) and the fifth capacitor (C5); the negative electrode of the fifth polarity capacitor (E8), the other end of the fifth capacitor (C5) and the sixth capacitor (C13) are grounded; the other end of the thirteenth resistor (R71) and the other end of the sixth capacitor (C13) are connected to the positive terminal of the signal input of the second operational amplifier (U2B); the negative terminal of the signal input of the second operational amplifier (U2B) is connected to the fourteenth resistor (R62), the fifteenth resistor (R64) and the seventh capacitor (C23); the other end of the fourteenth resistor (R62) is grounded; the other end of the fifteenth resistor (R64), the sixteenth resistor (R20) and the seventh capacitor ( The other end of the sixteenth resistor (R20) is connected to the signal output end of the second operational amplifier (U2B); the other end of the sixteenth resistor (R20) is connected to the eighth capacitor (C22) and the signal input positive end of the third operational amplifier (U2A); the other end of the eighth capacitor (C22) is grounded; the signal input negative end of the third operational amplifier (U2A) is connected to the seventeenth resistor (R73), the eighteenth resistor (R67) and the ninth capacitor (C10); the other end of the seventeenth resistor (R73) is grounded, and the other end of the eighteenth resistor (R67), the other end of the ninth capacitor (C10) and the signal output end of the third operational amplifier (U2A) are all connected to the current signal input end of the processor; the positive power supply end of the third operational amplifier (U2A), the positive pole of the tenth capacitor (DC3) and the sixth polarity capacitor (E11) are all connected to the positive pole of the power supply; the negative power supply end of the third operational amplifier (U2A) is grounded.

[0023] Furthermore, a socket is provided; the positive end of the socket is connected to the drain of the first PMOS tube (Q8); the negative end of the socket is connected to the end of the sixth resistor (R40) away from the ground; the fan is provided with a plug in conjunction with the socket, so that the fan can be connected to the circuit through the plug.

[0024] Furthermore, the data transmission circuit includes a USB interface; a data connection end of the USB interface is connected to the processor.

[0025] Furthermore, the data transmission circuit includes a WIFI module; a data connection end of the WIFI module is connected to the processor.

[0026] Furthermore, the storage circuit includes an EEPROM memory; a data connection end of the EEPROM memory is connected to a data end of the processor.

[0027] Furthermore, a key input module is also provided; the signal output end of the key input circuit is connected to the key signal input end of the processor.

[0028] Furthermore, the display screen is a TM12864L display screen.

[0029] Furthermore, the processor is a PIC18F45K22 chip.

[0030] The beneficial effects of the present invention are:

[0031] When in use, the positive pole of the power supply of the EBM fan is connected to the drain of the first PMOS tube (Q8), and the negative pole of the power supply of the EBM fan is connected to the end of the sixth resistor (R40) away from the ground. The processor sends a control signal to the drive circuit. The drive circuit drives the EBM fan to work according to the control signal. When the EBM fan is working, the speed detection circuit, the current detection circuit and the voltage detection circuit respectively detect the current speed, current and voltage of the EBM fan. The speed detection circuit, the current detection circuit and the voltage detection circuit detect the speed, current and voltage data to the processor. The processor enables the display screen to display the speed, current and voltage data, so that the user can check the current status of the fan. At the same time, the processor compares the measured data with the pre-stored data and displays the comparison results. It is convenient for the user to judge whether the fan is faulty according to the comparison results, thereby improving efficiency.

[0032] This EBM fan tester does not need to connect a voltmeter, ammeter, or photoelectric tachometer when testing a fan. It only needs to connect the fan to the circuit. This reduces wiring operations, reduces the rate of wrong connection, and ensures the quality and efficiency of testing. Simple connection also prevents the measurement quality from being affected by too many human factors, which can lead to different results obtained by different people. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is the fan driving circuit diagram and detection circuit diagram;

[0035] Figure 2 Part of the power circuit Figure 1 ;

[0036] Figure 3 Part of the power circuit Figure 2 ;

[0037] Figure 4 For storing circuit diagrams;

[0038] Figure 5 To display the circuit diagram;

[0039] Figure 6 A circuit diagram of a processor;

[0040] Figure 7 This is a circuit diagram when the data transmission circuit is a USB interface;

[0041] Figure 8 This is the circuit diagram when the data transmission circuit is a WIFI module. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Example:

[0048] The present embodiment provides an EBM fan tester, which includes a processor, a power supply circuit, a fan driving circuit, a speed detection circuit, a current detection circuit, a voltage detection circuit, a storage circuit, a display circuit and a data transmission circuit.

[0049] like Figure 1As shown, the fan driving circuit includes a first capacitor (R69) having one end connected to the processor, the other end of the first capacitor (R69) is connected to the base of the first transistor (Q6) and one end of the second resistor (R75), and the other end of the second resistor (R75) and the emitter of the first transistor (Q6) are grounded together. The collector of the first transistor (Q6) is connected to one end of the third resistor (R70), the other end of the third resistor (R70) is connected to one end of the fourth resistor (R61), one end of the fifth resistor (R76) and one end of the first capacitor (C19), the other end of the fifth resistor (R76) and the other end of the first capacitor (C19) are both connected to the gate of the first PMOS tube (Q8), and the other end of the fourth resistor (R61) and the source of the first PMOS tube (Q8) are connected to the positive electrode of the power supply. The drain of the first PMOS tube (Q8) is connected to the positive electrode of the first polarity capacitor (E21), the positive electrode of the second polarity capacitor (E20), the positive electrode of the third polarity capacitor (E19), the positive electrode of the fourth polarity capacitor (E18), one end of the second capacitor (C19-1) and the positive electrode of the fan power supply. The negative electrode of the first polarity capacitor (E21), the negative electrode of the second polarity capacitor (E20), the negative electrode of the third polarity capacitor (E19), the negative electrode of the fourth polarity capacitor (E18), the other end of the second capacitor (C19-1) and one end of the sixth resistor (R40) are grounded. The other end of the sixth resistor (R40) is connected to the negative electrode of the fan power supply.

[0050] The speed detection circuit comprises a first inductor (L4) having one end connected to the positive pole of the fan power supply, the other end of the first inductor (L4) being connected in series with a seventh resistor (R56), the other end of the seventh resistor (R56) being connected to the anode of the first diode (D9), the cathode of the second diode (D9-1), one end of the third capacitor (C4) and the signal input positive end of the first operational amplifier (U11A). The cathode of the first diode (D9) is connected to the positive pole of the power supply, and the anode of the second diode (D9-1) and the other end of the third capacitor (C4) are both grounded. The signal input negative end of the first operational amplifier (U11A) is connected to the ninth resistor (R68), the tenth resistor (R74), the negative power supply end of the first operational amplifier (U11A) and the fourth capacitor (C14), the other end of the ninth resistor (R68) is grounded, and the other end of the tenth resistor (R74) and the other end of the fourth capacitor (C14) are both connected to the signal output end of the first operational amplifier (U11A) and the eleventh resistor (R59). The other end of the eleventh resistor (R59) is connected to the base of the second triode (Q7). The collector of the second triode (Q7) is connected to the twelfth resistor (R60) and the speed signal input end of the processor. The other end of the twelfth resistor (R60) is connected to the positive electrode of the power supply. The emitter of the second triode (Q7) is grounded.

[0051] The eighth resistor (R65) of the current detection circuit. One end of the eighth resistor (R65) is connected to the positive terminal of the signal input of the first operational amplifier (U11A), and the other end is connected to the positive pole of the fifth polarity capacitor (E8), the thirteenth resistor (R71) and the fifth capacitor (C5). The negative pole of the fifth polarity capacitor (E8), the other end of the fifth capacitor (C5) and the sixth capacitor (C13) are grounded together. The other end of the thirteenth resistor (R71) and the other end of the sixth capacitor (C13) are connected to the positive terminal of the signal input of the second operational amplifier (U2B). The negative terminal of the signal input of the second operational amplifier (U2B) is connected to the fourteenth resistor (R62), the fifteenth resistor (R64) and the seventh capacitor (C23). The other end of the fourteenth resistor (R62) is grounded. The other end of the fifteenth resistor (R64), the sixteenth resistor (R20) and the other end of the seventh capacitor (C23) are connected to the signal output terminal of the second operational amplifier (U2B). The other end of the sixteenth resistor (R20) is connected to the eighth capacitor (C22) and the signal input positive end of the third operational amplifier (U2A). The other end of the eighth capacitor (C22) is grounded. The signal input negative end of the third operational amplifier (U2A) is connected to the seventeenth resistor (R73), the eighteenth resistor (R67) and the ninth capacitor (C10). The other end of the seventeenth resistor (R73) is grounded, and the other end of the eighteenth resistor (R67), the other end of the ninth capacitor (C10) and the signal output end of the third operational amplifier (U2A) are all connected to the current signal input end of the processor. The positive power supply end of the third operational amplifier (U2A), the tenth capacitor (DC3) and the positive pole of the sixth polarity capacitor (E11) are all connected to the positive power supply. The negative power supply end of the third operational amplifier (U2A) is grounded.

[0052] The voltage detection circuit includes a second inductor (L3) connected to the positive pole of the fan power supply, and the other end of the second inductor (L3) is connected to the nineteenth resistor (R57). The other end of the nineteenth resistor (R57) is connected to the tenth capacitor (C9), the anode of the third diode (D10), the cathode of the fourth diode (D10-1) and the twentieth resistor (R66). The cathode of the third diode (D10) is connected to the positive pole of the power supply. The anode of the fourth diode (D10-1), the tenth capacitor (C12), the negative pole of the seventh polarity capacitor (E12) and the twenty-first resistor (R72) are grounded together. The other end of the twentieth resistor (R66), the other end of the tenth capacitor (C12), the other end of the twenty-first resistor (R72) and the positive pole of the seventh polarity capacitor (E12) are all connected to the signal input positive end of the fourth operational amplifier (U2D). The signal input negative end and the signal output end of the fourth operational amplifier (U2D) are connected to the voltage signal input end of the processor.

[0053] Power circuit such as Figure 2 and Figure 3As shown. The power circuit is connected to a battery. The power circuit converts the voltage of the point into two voltage output terminals of stable 6V voltage and 3V voltage. The power circuit is used to convert the voltage of the battery and output the converted voltage stably.

[0054] Storage circuits such as Figure 4 As shown. The memory selects an EEPROM memory chip of model W25Q64FV. The EEPROM memory chip can avoid data loss caused by power failure. The data connection end of the storage circuit is connected to the data end of the processor. The storage circuit is used to receive and store data from the processor. The storage circuit can also transmit data to the processor.

[0055] Display circuit as Figure 5 As shown. The display circuit includes a display screen. The model of the display screen is TM12864L. The display signal input end of the display screen is connected to the display signal output end of the processor. The display circuit is used to receive data from the processor and display it.

[0056] The data connection end of the data transmission circuit is connected to the processor. The data transmission circuit is used to receive data from the processor and transmit it out. The data transmission circuit is also used to receive data from an external device and transmit the data to the processor.

[0057] The processor is PIC18F45K22 chip, and its circuit is as follows Figure 6 As shown. The processor is used to receive the speed data of the speed detection circuit, the current data of the current detection circuit, and the voltage data of the voltage detection circuit. The processor also stores the received data in the storage circuit or sends the data in the storage circuit through the data transmission circuit. The processor also displays the received data through the display circuit.

[0058] When in use, the positive pole of the power supply of the EBM fan is connected to the drain of the first PMOS tube (Q8), and the negative pole of the power supply of the EBM fan is connected to the end of the sixth resistor (R40) away from the ground.

[0059] The test method of the EBM fan tester includes the following steps:

[0060] S1. The processor sends a PWM control signal to the drive circuit, so that the drive circuit drives the fan with a fixed drive voltage; at the same time, the voltage detection circuit, the speed detection circuit and the current detection circuit transmit the measured voltage, speed and current data to the processor respectively; the processor compares the received voltage, speed and current data with the pre-stored voltage, speed and current data under the corresponding drive voltage and displays the comparison result through the display circuit.

[0061] S2. The processor sends a control signal to enable the driver to drive the fan with multiple different driving voltages; the processor compares the voltage, speed and current data received under different driving voltages with the voltage, speed and current data under the corresponding driving voltages stored in advance and displays the comparison result through the display circuit.

[0062] The processor also stores the speed, current and voltage data in the storage circuit. This EBM fan tester does not need to connect the voltmeter, ammeter and photoelectric tachometer when testing the fan. It only needs to connect the fan to the circuit. It reduces the wiring operation, reduces the wrong connection rate, and ensures the quality and efficiency of the test. The simple connection also avoids the measurement quality being interfered by too many human factors, which leads to different results obtained by different personnel. At the same time, the processor will compare the data obtained by the test with the pre-stored data, and display the comparison results, so that the test personnel can obtain the data and the normal situation of the data. In addition, the processor can also transmit the data stored in the storage circuit through the data transmission circuit, which can be transmitted to a mobile phone, a computer or a USB flash drive, etc. It is convenient for data backup and transmission. In practice, instructions can also be sent to the processor through the data transmission circuit to achieve the purpose of remote control.

[0063] In this embodiment, a socket is also provided. The positive end of the socket is connected to the drain of the first PMOS tube (Q8). The negative end of the socket is connected to the end of the sixth resistor (R40) away from the ground. The fan is provided with a plug in conjunction with the socket, so that the fan can be connected to the circuit through the plug.

[0064] When in use, the fan can be quickly connected to the drive circuit by plugging the fan plug into the socket, which simplifies the connection process between the fan and the EBM fan tester and further improves efficiency.

[0065] In this embodiment, the data transmission circuit includes a USB interface, and its circuit is as follows: Figure 7 As shown. The data connection end of the USB interface is connected to the processor. Through the USB interface, the processor can transfer the data stored in the storage circuit through the USB interface, which is convenient for data backup and transmission.

[0066] In this embodiment, the data transmission circuit includes a WIFI module, and its circuit is as follows: Figure 8 As shown. The data connection end of the WIFI module is connected to the processor. Through the WIFI module, the processor can wirelessly transmit the data stored in the storage circuit through the WIFI module, without the data line transmission, so that the device can transmit data at any location, further facilitating data backup and transmission. It is also more convenient for remote control.

[0067] In this embodiment, a key input module is also provided. The signal output end of the key input circuit is connected to the key signal input end of the processor, which is convenient for user operation.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An EBM fan tester, characterized by: It includes a processor and a power supply circuit connected to the processor, a fan driving circuit, a speed detection circuit, a current detection circuit, a voltage detection circuit, a storage circuit, a display circuit and a data transmission circuit; The power circuit is connected to a battery; The power supply circuit is used to output the battery voltage stably; The power input end of the fan driving circuit is connected to the power output end of the power circuit; the power output end of the fan driving circuit is connected to the power input end of the fan; the control signal input end of the fan driving circuit is connected to the control signal output end of the processor; the fan driving circuit is used to receive the control signal of the processor and output power of different voltages to the fan according to the control signal; The signal input end of the speed detection circuit is connected to the negative end of the power input of the fan; the signal output end of the speed detection circuit is connected to the speed signal input end of the processor; the speed detection circuit is used to detect the speed of the fan and transmit the speed signal to the processor; The signal output end of the current detection circuit is connected to the current signal input end of the processor; the current detection circuit is used to detect the current of the fan and transmit the current signal to the processor; The signal input end of the voltage detection circuit is connected to the positive power input end of the fan; the signal output end of the voltage detection circuit is connected to the voltage signal input end of the processor; the voltage detection circuit is used to detect the voltage of the fan and transmit the voltage signal to the processor; the data connection end of the storage circuit is connected to the data end of the processor; the storage circuit is used to receive and store data from the processor; the storage circuit can also transmit data to the processor; The display circuit includes a display screen; the display signal input terminal of the display screen is connected to the display signal output terminal of the processor; the display circuit is used to receive data from the processor and display it; The data connection end of the data transmission circuit is connected to the processor; The data transmission circuit is used to receive data from the processor and transmit it out; the data transmission circuit is also used to receive data from an external device and transmit the data to the processor; The processor sends a control signal to the fan drive circuit; the processor is used to receive the speed data of the speed detection circuit, the current data of the current detection circuit, the voltage data of the voltage detection circuit and analyze the received data; The processor also stores the received data into the storage circuit or sends the data in the storage circuit through the data transmission circuit; the processor also displays the received data through the display circuit; The test method of the EBM fan tester includes the following steps: S1, the processor sends a control signal to the drive circuit, so that the drive circuit drives the fan with a fixed drive voltage; at the same time, the voltage detection circuit, the speed detection circuit and the current detection circuit transmit the measured voltage, speed and current data to the processor respectively; The processor compares the received voltage, speed and current data with the voltage, speed and current data under the corresponding driving voltage pre-stored in the storage circuit and displays the comparison result through the display circuit; S2, the processor sends a control signal so that the driver drives the fan with multiple different driving voltages; The processor compares the voltage, speed and current data received under different driving voltages with the voltage, speed and current data under the corresponding driving voltage pre-stored in the storage circuit and displays the comparison result through the display circuit; The voltage detection circuit comprises a second inductor (L3) connected to the positive electrode of the fan power supply, and the other end of the second inductor (L3) is connected to the nineteenth resistor (R57); the other end of the nineteenth resistor (R57) is connected to the tenth capacitor (C9), the anode of the third diode (D10), the cathode of the fourth diode (D10-1) and the twentieth resistor (R66); the cathode of the third diode (D10) is connected to the positive electrode of the power supply; the anode of the fourth diode (D10-1), the tenth capacitor (C12), the negative electrode of the seventh polarity capacitor (E12) and the twenty-first resistor (R72) are commonly grounded; the other end of the twentieth resistor (R66), the other end of the tenth capacitor (C12), the other end of the twenty-first resistor (R72) and the positive electrode of the seventh polarity capacitor (E12) are all connected to the signal input positive terminal of the fourth operational amplifier (U2D); the signal input negative terminal and the signal output terminal of the fourth operational amplifier (U2D) are commonly connected to the voltage signal input terminal of the processor; The fan drive circuit comprises a first resistor (R69) having one end connected to the PWM signal output end of the processor, the other end of the first resistor (R69) being connected to the base of the first triode (Q6) and one end of the second resistor (R75), the other end of the second resistor (R75) and the emitter of the first triode (Q6) being grounded together; the collector of the first triode (Q6) being connected to one end of the third resistor (R70), the other end of the third resistor (R70) being connected to one end of the fourth resistor (R61), one end of the fifth resistor (R76) and one end of the first capacitor (C19), the other end of the fifth resistor (R76) and the other end of the first capacitor (C19) being connected to the gate of the first PMOS tube (Q8), the fourth resistor (R61) being connected to the base of the first triode (Q6) and one end of the second resistor (R75), and the other end of the second resistor (R75) being connected to the emitter of the first triode (Q6). ) and the source of the first PMOS tube (Q8) are connected to the positive electrode of the power supply; the drain of the first PMOS tube (Q8) is connected to the positive electrode of the first polarity capacitor (E21), the positive electrode of the second polarity capacitor (E20), the positive electrode of the third polarity capacitor (E19), the positive electrode of the fourth polarity capacitor (E18), one end of the second capacitor (C19-1) and the positive electrode of the power supply of the fan; the negative electrode of the first polarity capacitor (E21), the negative electrode of the second polarity capacitor (E20), the negative electrode of the third polarity capacitor (E19), the negative electrode of the fourth polarity capacitor (E18), the other end of the second capacitor (C19-1) and one end of the sixth resistor (R40) are grounded; the other end of the sixth resistor (R40) is connected to the negative electrode of the power supply of the fan; The speed detection circuit comprises a first inductor (L4) having one end connected to the positive electrode of a fan power supply, the other end of the first inductor (L4) being connected in series with a seventh resistor (R56), the other end of the seventh resistor (R56) being connected to the anode of a first diode (D9), the cathode of a second diode (D9-1), one end of a third capacitor (C4) and the positive signal input end of a first operational amplifier (U11A); the cathode of the first diode (D9) being connected to the positive electrode of the power supply, the anode of the second diode (D9-1) and the other end of the third capacitor (C4) being grounded; the negative signal input end of the first operational amplifier (U11A) being connected to the ninth resistor (R68), the tenth resistor ( R74), the negative power supply terminal of the first operational amplifier (U11A) and the fourth capacitor (C14), the other end of the ninth resistor (R68) is grounded, the other end of the tenth resistor (R74) and the other end of the fourth capacitor (C14) are both connected to the signal output terminal of the first operational amplifier (U11A) and the eleventh resistor (R59); the other end of the eleventh resistor (R59) is connected to the base of the second triode (Q7); the collector of the second triode (Q7) is connected to the twelfth resistor (R60) and the speed signal input terminal of the processor; the other end of the twelfth resistor (R60) is connected to the positive electrode of the power supply; the emitter of the second triode (Q7) is grounded; An eighth resistor (R65) in the current detection circuit; one end of the eighth resistor (R65) is connected to the positive terminal of the signal input of the first operational amplifier (U11A), and the other end is connected to the positive electrode of the fifth polarity capacitor (E8), the thirteenth resistor (R71) and the fifth capacitor (C5); the negative electrode of the fifth polarity capacitor (E8), the other end of the fifth capacitor (C5) and the sixth capacitor (C13) are commonly grounded; the other end of the thirteenth resistor (R71) and the other end of the sixth capacitor (C13) are commonly connected to the positive terminal of the signal input of the second operational amplifier (U2B); The negative end of the signal input of the second operational amplifier (U2B) is connected to the fourteenth resistor (R62), the fifteenth resistor (R64) and the seventh capacitor (C23); the other end of the fourteenth resistor (R62) is grounded; the other end of the fifteenth resistor (R64), the sixteenth resistor (R20) and the other end of the seventh capacitor (C23) are commonly connected to the signal output end of the second operational amplifier (U2B); the other end of the sixteenth resistor (R20) is connected to the eighth capacitor (C22) and the positive end of the signal input of the third operational amplifier (U2A); the other end of the eighth capacitor (C22) is grounded; The negative end of the signal input of the operational amplifier (U2A) is connected to the seventeenth resistor (R73), the eighteenth resistor (R67) and the ninth capacitor (C10); the other end of the seventeenth resistor (R73) is grounded, the other end of the eighteenth resistor (R67), the other end of the ninth capacitor (C10) and the signal output end of the third operational amplifier (U2A) are all connected to the current signal input end of the processor; the positive power supply end of the third operational amplifier (U2A), the tenth capacitor (DC3) and the positive electrode of the sixth polarity capacitor (E11) are all connected to the positive electrode of the power supply; the negative power supply end of the third operational amplifier (U2A) is grounded.

2. The EBM fan tester according to claim 1, characterized in that: A socket is also provided; the positive end of the socket is connected to the drain of the first PMOS tube (Q8); the negative end of the socket is connected to the end of the sixth resistor (R40) away from the ground; the fan is provided with a plug in conjunction with the socket, so that the fan can be connected to the circuit through the plug.

3. The EBM fan tester according to claim 1, characterized in that: The data transmission circuit comprises a USB interface; a data connection end of the USB interface is connected to the processor.

4. The EBM fan tester according to claim 1, characterized in that: The data transmission circuit includes a WIFI module; a data connection end of the WIFI module is connected to the processor.

5. The EBM fan tester according to claim 1, characterized in that: The storage circuit comprises an EEPROM memory; a data connection end of the EEPROM memory is connected to a data end of the processor.

6. The EBM fan tester according to claim 1, characterized in that: A key input module is also provided; the signal output end of the key input circuit is connected to the key signal input end of the processor.

7. The EBM fan tester according to claim 1, characterized in that: The display screen is a TM12864L display screen.

8. The EBM fan tester according to claim 1, characterized in that: The processor is a PIC18F45K22 chip.

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