CN110748498A - EBM fan tester - Google Patents

EBM fan tester Download PDF

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Publication number
CN110748498A
CN110748498A CN201911116980.0A CN201911116980A CN110748498A CN 110748498 A CN110748498 A CN 110748498A CN 201911116980 A CN201911116980 A CN 201911116980A CN 110748498 A CN110748498 A CN 110748498A
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CN
China
Prior art keywords
resistor
circuit
processor
fan
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911116980.0A
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Chinese (zh)
Inventor
魏金林
孙豪
黄大彬
鞠翔
李�浩
刘畅
汪子腾
杨涛
陈国峰
周源
魏国富
唐铁军
张强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kunming Bureau of Extra High Voltage Power Transmission Co
Original Assignee
Kunming Bureau of Extra High Voltage Power Transmission Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kunming Bureau of Extra High Voltage Power Transmission Co filed Critical Kunming Bureau of Extra High Voltage Power Transmission Co
Priority to CN201911116980.0A priority Critical patent/CN110748498A/en
Publication of CN110748498A publication Critical patent/CN110748498A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Abstract

The invention relates to the field of EBM fan diagnosis equipment, and discloses an EBM fan tester which comprises a processor, a power supply circuit, a fan driving circuit, a rotating 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 provides stable power, the storage circuit is used for storing data, the display circuit is used for displaying the detection result, and the data transmission circuit is used for exchanging data. When in use, the EBM fan is connected. The processor sends out a PWM control signal to the driving circuit to drive the EBM fan to work. When the EBM fan works, the rotating speed detection circuit, the current detection circuit and the voltage detection circuit respectively detect the current rotating speed, current and voltage of the EBM fan and transmit data to the processor. The display screen displays the current data. When the EBM fan tester detects the fan, the fan only needs to be connected to the circuit. And the connection operation is reduced, the misconnection rate is reduced, and the detection quality and efficiency are ensured.

Description

EBM fan tester
Technical Field
The invention relates to the field of EBM fan diagnosis equipment, in particular to an EBM fan tester.
Background
In a high-voltage direct-current transmission system, an automatic control system is largely used for monitoring power transmission and transformation devices (or facilities) in real time. SIMATIC TDC as a high-performance automation system with multiple processors, it is especially used in the aspects of process control, fast response and multi-drive synchronization in large-scale equipment, and is widely used in the aspect of high voltage direct current system control protection system in the global scope. The TDC frame is used as a hardware platform of an automatic control system of the TDC frame, an EBM-PAPST axial flow fan is arranged on the frame of the unit to form an air supply current conversion cooling system, air is blown to dissipate heat of equipment in the frame, the equipment is ensured to work continuously for a long time, and the fault of the air supply current conversion cooling system exits from a corresponding control protection system, so that the safe and stable operation of the high-voltage direct-current transmission system is influenced.
During operation, the phenomenon that the air supply conversion cooling system works abnormally sometimes occurs. Because the EBM-PAPST axial flow fan is not monitored in real time correspondingly in the initial design, the failure of the axial flow fan cannot be determined in time when the air supply current conversion cooling system works abnormally. When the EBM-PAPST axial flow fan is suspected to be out of order, a testing tool or instrument for carrying out electrifying measurement on the axial flow fan is absent. Brings great trouble to the diagnosis work of the fan.
In the prior art, a tester connects a current meter and a voltmeter to a fan to detect current and voltage; and meanwhile, the rotating speed of the fan is tested through a photoelectric tachometer. The detection personnel need to record the data detected each time, and compare and analyze the data after the detection is finished to judge whether the fan is in fault. This detection method is complicated in process and takes a lot of time. Because all manual operations are carried out, errors are likely to occur in the detection process, and the detection result is inaccurate.
Disclosure of Invention
The invention aims to provide an EBM fan tester which can quickly measure the current, the voltage and the rotating speed of an EBM fan and is convenient for diagnosing the fan.
The embodiment of the invention is realized by the following steps:
an EBM fan tester is characterized in that: the device comprises a processor, and a power supply circuit, a fan driving circuit, a rotating speed detection circuit, a current detection circuit, a voltage detection circuit, a storage circuit, a display circuit and a data transmission circuit which are connected with the processor;
the power circuit is connected with a battery; the power supply circuit is used for outputting the voltage of the battery in a stable manner;
the power supply input end of the fan driving circuit is connected with the power supply output end of the power supply circuit; the power supply output end of the fan driving circuit is connected with the power supply input end of the fan; the control signal input end of the fan driving circuit is connected with the control signal output end of the processor; the fan driving circuit is used for receiving a control signal of the processor and outputting power supplies with different voltages to the fan according to the control signal;
the signal input end of the rotating speed detection circuit is connected with the power input negative end of the fan; the signal output end of the rotating speed detection circuit is connected with the rotating speed signal input end of the processor; the rotating speed detection circuit is used for detecting the rotating speed of the fan and transmitting a rotating speed signal to the processor;
the signal output end of the current detection circuit is connected with the current signal input end of the processor; the rotating speed detection circuit is used for detecting the current of the fan and transmitting a current signal to the processor;
the signal input end of the voltage detection circuit is connected with the positive power supply input end of the fan; the signal output end of the voltage detection circuit is connected with the voltage signal input end of the processor; the voltage detection circuit is used for detecting the voltage of the fan and transmitting a voltage signal to the processor; the data connecting end of the storage circuit is connected with the data end of the processor; the storage circuit is used for receiving and storing data of the processor; the memory circuit is also capable of transmitting data to the processor;
the display circuit comprises a display screen; the display signal input end of the display screen is connected with the display signal output end of the processor; the display circuit is used for receiving and displaying the data of the processor;
the data connection end of the data transmission circuit is connected with the processor; the data transmission circuit is used for receiving and transmitting data of the processor; the data transmission circuit is also used for receiving data of external equipment and transmitting the data to the processor;
the processor sends a control signal to the fan driving circuit; the processor is used for receiving the rotating speed data of the rotating speed detection circuit, the current data of the current detection circuit and the voltage data of the voltage detection circuit and analyzing the received data; the processor also stores the received data in the storage circuit or sends the data in the storage circuit out through the data transmission circuit; the processor also displays the received data through the display circuit;
the test method of the EBM fan tester comprises the following steps:
s1, the processor sends a control signal to the drive circuit to make the drive circuit drive the fan with a fixed drive voltage; meanwhile, the voltage detection circuit, the rotating speed detection circuit and the current detection circuit respectively transmit the measured voltage, rotating speed and current data to the processor; the processor compares the received voltage, rotating speed and current data with the prestored voltage, rotating speed and current data under the corresponding driving voltage and displays the comparison result through the display circuit;
s2, the processor sends out control signals to enable the driver to drive the fan with a plurality of different driving voltages; the processor compares the voltage, the rotating speed and the current data received under different driving voltages with the prestored voltage, rotating speed and current data under corresponding driving voltages and displays the comparison result through the display circuit.
Further, the voltage detection circuit comprises a second inductor (L3) connected with the positive pole of the fan power supply, and the other end of the second inductor (L3) is connected with a nineteenth resistor (R57); the other end of the nineteenth resistor (R57) is connected with 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 with the positive electrode of the power supply; the anode of the fourth diode (D10-1), the tenth capacitor (C12), the cathode of the seventh polar 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 anode of the seventh polar capacitor (E12) are connected with 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 with the voltage signal input end of the processor;
the fan driving circuit comprises a first capacitor (R69) with one end connected to the PWM signal output end of the processor, the other end of the first capacitor (R69) is connected with the base electrode of a first triode (Q6) and one end of a second resistor (R75), and the other end of the second resistor (R75) and the emitter electrode of the first triode (Q6) are grounded together; a collector of the first triode (Q6) is connected with one end of a third resistor (R70), the other end of the third resistor (R70) is connected with one end of a fourth resistor (R61), one end of a fifth resistor (R76) and one end of a first capacitor (C19), the other end of the fifth resistor (R76) and the other end of the first capacitor (C19) are both connected with a grid electrode of a first PMOS (Q8), and the other end of the fourth resistor (R61) and a source electrode of the first PMOS (Q8) are connected to the positive electrode of a power supply in common; the drain of the first PMOS tube (Q8) is connected with the positive electrode of the first polar capacitor (E21), the positive electrode of the second polar capacitor (E20), the positive electrode of the third polar capacitor (E19), the positive electrode of the fourth polar 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 commonly grounded; the other end of the sixth resistor (R40) is connected with the negative electrode of the power supply of the fan;
the rotating speed detection circuit comprises a first inductor (L4) with one end connected to the positive pole of the fan power supply, a seventh resistor (R56) is connected to the other end of the first inductor (L4) in series, the other end of the seventh resistor (R56) is connected with the anode of a first diode (D9), the cathode of a second diode (D9-1), one end of a third capacitor (C4) and the signal input positive end of a first operational amplifier (U11A); the cathode of the first diode (D9) is connected with the anode 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 negative signal input end of the first operational amplifier (U11A) is connected with a ninth resistor (R68), a tenth resistor (R74), the negative power end of the first operational amplifier (U11A) and a 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 with the signal output end of the first operational amplifier (U11A) and an eleventh resistor (R59); the other end of the eleventh resistor (R59) is connected with the base of the second triode (Q7); the collector of the second triode (Q7) is connected with the twelfth resistor (R60) and the rotating speed signal input end of the processor; the other end of the twelfth resistor (R60) is connected with the positive electrode of the power supply; the emitter of the second triode (Q7) is grounded;
a current detection circuit eighth resistor (R65); one end of an eighth resistor (R65) is connected to the signal input positive terminal of the first operational amplifier (U11A), and the other end of the eighth resistor (R65) 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 connected to the positive signal input terminal of the second operational amplifier (U2B); the negative signal input terminal of the second operational amplifier (U2B) is connected with a fourteenth resistor (R62), a fifteenth resistor (R64) and a seventh capacitor (C23); the other end of the fourteenth resistor (R62) is grounded; the other end of the fifteenth resistor (R64), the other end of the sixteenth resistor (R20) and the other end of the seventh capacitor (C23) are connected to a signal output end of the second operational amplifier (U2B) in common; the other end of the sixteenth resistor (R20) is connected with the signal input positive terminal of the eighth capacitor (C22) and the third operational amplifier (U2A); the other end of the eighth capacitor (C22) is grounded; the signal input negative terminal of the third operational amplifier (U2A) is connected with a seventeenth resistor (R73), an eighteenth resistor (R67) and a 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 with the current signal input end of the processor; the positive power supply end of the third operational amplifier (U2A), the positive electrodes of the tenth capacitor (DC3) and the sixth polar capacitor (E11) are all connected with the positive electrode of the power supply; the negative power supply end of the third operational amplifier (U2A) is grounded.
Furthermore, a socket is also arranged; the positive end of the socket is connected with the drain electrode of the first PMOS tube (Q8); the negative end of the socket is connected with one end of a sixth resistor (R40) far away from the ground; the fan is provided with a plug matched with the socket, so that the fan can be connected to a circuit through the plug.
Further, the data transmission circuit comprises a USB interface; the data connection end of the USB interface is connected with the processor.
Further, the data transmission circuit comprises a WIFI module; the data connection end of the WIFI module is connected with the processor.
Further, the storage circuit comprises an EEPROM memory; the data connection end of the EEPROM is connected with the data end of the processor.
Furthermore, a key input module is also arranged; the signal output end of the key input circuit is connected with the key signal input end of the processor.
Further, the display screen is a TM12864L display screen.
Further, the processor is a PIC18F45K22 chip.
The invention has the beneficial effects that:
when the power supply is used, the positive electrode of the power supply of the EBM fan is connected to the drain electrode of the first PMOS tube (Q8), and the negative electrode of the power supply of the EBM fan is connected to one end, far away from the ground, of the sixth resistor (R40). The processor sends a control signal to the driving circuit. The drive circuit drives the EBM fan to work according to the control signal. When the EBM fan works, the rotating speed detection circuit, the current detection circuit and the voltage detection circuit respectively detect the current rotating speed, current and voltage of the EBM fan. And the rotating speed, the current and the voltage data detected by the rotating speed detection circuit, the current detection circuit and the voltage detection circuit are all transmitted to the processor. The processor enables the display screen to display the data of the rotating speed, the current and the voltage, and a user can conveniently check the current state of the fan. Meanwhile, the processor compares the measured data with the pre-stored data and displays the comparison result. The user can conveniently judge whether the fan is in fault according to the comparison result, and the efficiency is improved.
When the EBM fan tester detects the fan, a voltmeter, an ammeter and a photoelectric tachometer do not need to be connected, and the fan only needs to be connected to a circuit. And the connection operation is reduced, the misconnection rate is reduced, and the detection quality and efficiency are ensured. The simple connection also avoids the measurement quality from being interfered by too many human factors, which results in different results obtained by different personnel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a circuit diagram of a fan driving circuit and a detecting circuit;
FIG. 2 is a circuit diagram of a portion of the power circuit of FIG. 1;
FIG. 3 is a circuit diagram of a portion of a power circuit FIG. 2;
FIG. 4 is a memory circuit diagram;
FIG. 5 is a circuit diagram;
FIG. 6 is a circuit diagram of a processor;
FIG. 7 is a circuit diagram of the data transmission circuit being a USB interface;
fig. 8 is a circuit diagram when the data transmission circuit is a WIFI module.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
the embodiment provides an EBM fan tester, which includes a processor, a power supply circuit, a fan driving circuit, a rotation speed detection circuit, a current detection circuit, a voltage detection circuit, a storage circuit, a display circuit, and a data transmission circuit.
As shown in fig. 1, 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 commonly grounded. The collector of the first triode (Q6) is connected with one end of a third resistor (R70), the other end of the third resistor (R70) is connected with one end of a fourth resistor (R61), one end of a fifth resistor (R76) and one end of a first capacitor (C19), the other end of the fifth resistor (R76) and the other end of the first capacitor (C19) are both connected with the grid of a 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 pole of a power supply in common. The drain of the first PMOS tube (Q8) is connected with the positive electrode of the first polar capacitor (E21), the positive electrode of the second polar capacitor (E20), the positive electrode of the third polar capacitor (E19), the positive electrode of the fourth polar 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 commonly grounded. The other end of the sixth resistor (R40) is connected with the negative electrode of the power supply of the fan.
The rotating speed detection circuit comprises a first inductor (L4) with one end connected to the positive pole of the fan power supply, a seventh resistor (R56) is connected with the other end of the first inductor (L4) in series, and the other end of the seventh resistor (R56) is connected with the anode of a first diode (D9), the cathode of a second diode (D9-1), one end of a third capacitor (C4) and the signal input positive end of a first operational amplifier (U11A). The cathode of the first diode (D9) is connected with the anode 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 negative signal input end of the first operational amplifier (U11A) is connected with a ninth resistor (R68), a tenth resistor (R74), the negative power end of the first operational amplifier (U11A) and a 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 connected with the signal output end of the first operational amplifier (U11A) and an eleventh resistor (R59). The other end of the eleventh resistor (R59) is connected with the base of the second triode (Q7). The collector of the second triode (Q7) is connected with the twelfth resistor (R60) and the rotating speed signal input end of the processor. The other end of the twelfth resistor (R60) is connected with the positive electrode of the power supply. The emitter of the second transistor (Q7) is grounded.
The current detection circuit eighth resistor (R65). One end of the eighth resistor (R65) is connected to the positive signal input terminal 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 connected to the positive signal input terminal of the second operational amplifier (U2B). The negative signal input terminal of the second operational amplifier (U2B) is connected with a fourteenth resistor (R62), a fifteenth resistor (R64) and a seventh capacitor (C23). The fourteenth resistor (R62) has its other end connected to ground. The other end of the fifteenth resistor (R64), the other end of 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 with the signal input positive terminal of the eighth capacitor (C22) and the third operational amplifier (U2A). The other terminal of the eighth capacitor (C22) is grounded. The negative signal input terminal of the third operational amplifier (U2A) is connected with a seventeenth resistor (R73), an eighteenth resistor (R67) and a 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 with the current signal input end of the processor. The positive power supply end of the third operational amplifier (U2A), the positive electrode of the tenth capacitor (DC3) and the positive electrode of the sixth polar capacitor (E11) are all connected with the positive electrode of the power supply. The negative power supply end of the third operational amplifier (U2A) is grounded.
The voltage detection circuit comprises a second inductor (L3) connected with the positive electrode of the fan power supply, and the other end of the second inductor (L3) is connected with a nineteenth resistor (R57). The other end of the nineteenth resistor (R57) is connected with 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 power supply. The anode of the fourth diode (D10-1), the tenth capacitor (C12), the cathode of the seventh polar 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 anode of the seventh polar capacitor (E12) are all connected with the signal input positive end of the fourth operational amplifier (U2D). And the signal input negative end and the signal output end of the fourth operational amplifier (U2D) are connected with the voltage signal input end of the processor together.
The power supply circuit is shown in fig. 2 and 3. The power circuit is connected with a battery. The power supply circuit converts the voltage applied at the point into two voltage output ends of stable 6V voltage and 3V voltage. The power supply circuit is used for converting the voltage of the battery and outputting the converted voltage stably.
The memory circuit is shown in fig. 4. The memory selects an EEPROM memory chip with the model W25Q64 FV. The EEPROM memory chip can avoid data loss caused by power failure. The data connection end of the storage circuit is connected with the data end of the processor. The storage circuit is used for receiving and storing data of the processor. The memory circuit is also capable of transmitting data to the processor.
The display circuit is shown in fig. 5. The display circuit includes a display screen. The display screen is model TM 12864L. The display signal input end of the display screen is connected with the display signal output end of the processor. The display circuit is used for receiving and displaying data of the processor.
The data connection end of the data transmission circuit is connected with the processor. The data transmission circuit is used for receiving and transmitting data of the processor. The data transmission circuit is also used for receiving data of an external device and transmitting the data to the processor.
The processor is a PIC18F45K22 chip, the circuit of which is shown in FIG. 6. The processor is used for receiving the rotating speed data of the rotating 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 out through the data transmission circuit. The processor also displays the received data through the display circuit.
When the power supply is used, the positive electrode of the power supply of the EBM fan is connected to the drain electrode of the first PMOS tube (Q8), and the negative electrode of the power supply of the EBM fan is connected to one end, far away from the ground, of the sixth resistor (R40).
The test method of the EBM fan tester comprises the following steps:
s1, the processor sends out a PWM control signal to the drive circuit, so that the drive circuit drives the fan with a fixed drive voltage; meanwhile, the voltage detection circuit, the rotating speed detection circuit and the current detection circuit respectively transmit the measured voltage, rotating speed and current data to the processor; the processor compares the received voltage, rotating speed and current data with the prestored voltage, rotating speed and current data under the corresponding driving voltage and displays the comparison result through the display circuit.
S2, the processor sends out control signals to enable the driver to drive the fan with a plurality of different driving voltages; the processor compares the voltage, the rotating speed and the current data received under different driving voltages with the prestored voltage, rotating speed and current data under corresponding driving voltages and displays the comparison result through the display circuit.
The processor also stores the speed, current and voltage data in the memory circuit. When the EBM fan tester detects the fan, a voltmeter, an ammeter and a photoelectric tachometer do not need to be connected, and the fan only needs to be connected to a circuit. And the connection operation is reduced, the misconnection rate is reduced, and the detection quality and efficiency are ensured. The simple connection also avoids the measurement quality from being interfered by too many human factors, which results in different results obtained by different personnel. Meanwhile, the processor can compare the detected data with the pre-stored data and display the comparison result, so that the detection personnel can conveniently acquire the normal conditions of the data and the data. In addition, the processor can also transmit the data stored in the storage circuit through the data transmission circuit, and can transmit the data to a mobile phone, a computer, a U disk or the like. And the data backup and transmission are convenient. In practice, the instruction can also be sent to the processor through the data transmission circuit so as to achieve the purpose of remote control.
In this embodiment, a socket is further provided. The positive end of the socket is connected with the drain electrode of the first PMOS tube (Q8). The negative terminal of the socket is connected with one end of the sixth resistor (R40) far away from the ground. The fan mating socket is provided with a plug to enable the fan to be connected to the circuit through the plug.
When the fan is used, the fan can be quickly connected to the driving circuit by plugging the plug of the fan into the socket. The connecting process of the fan and the EBM fan tester is simplified, and the efficiency is further improved.
In this embodiment, the data transmission circuit includes a USB interface, and the circuit thereof is as shown in fig. 7. The data connection end of the USB interface is connected with the processor. Through the USB interface, the processor can transmit the data stored in the storage circuit out through the USB interface, and the backup and the transmission of the data are convenient.
In this embodiment, the data transmission circuit includes a WIFI module, and a circuit thereof is as shown in fig. 8. The data connection end of the WIFI module is connected with the processor. Through the WIFI module, the data that the treater can go out storage circuit in through WIFI module wireless transmission, break away from the data line transmission for this device can be at arbitrary place transmission data, and further the backup and the transmission of convenient data. And the remote control is more convenient.
In this embodiment, a key input module is further provided. The signal output end of the key input circuit is connected with the key signal input end of the processor. The operation of the user is convenient.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An EBM fan tester is characterized in that: the device comprises a processor, and a power supply circuit, a fan driving circuit, a rotating speed detection circuit, a current detection circuit, a voltage detection circuit, a storage circuit, a display circuit and a data transmission circuit which are connected with the processor;
the power circuit is connected with a battery; the power supply circuit is used for outputting the voltage of the battery in a stable manner;
the power supply input end of the fan driving circuit is connected with the power supply output end of the power supply circuit; the power supply output end of the fan driving circuit is connected with the power supply input end of the fan; the control signal input end of the fan driving circuit is connected with the control signal output end of the processor; the fan driving circuit is used for receiving a control signal of the processor and outputting power supplies with different voltages to the fan according to the control signal;
the signal input end of the rotating speed detection circuit is connected with the power input negative end of the fan; the signal output end of the rotating speed detection circuit is connected with the rotating speed signal input end of the processor; the rotating speed detection circuit is used for detecting the rotating speed of the fan and transmitting a rotating speed signal to the processor;
the signal output end of the current detection circuit is connected with the current signal input end of the processor; the rotating speed detection circuit is used for detecting the current of the fan and transmitting a current signal to the processor;
the signal input end of the voltage detection circuit is connected with the positive power supply input end of the fan; the signal output end of the voltage detection circuit is connected with the voltage signal input end of the processor; the voltage detection circuit is used for detecting the voltage of the fan and transmitting a voltage signal to the processor; the data connecting end of the storage circuit is connected with the data end of the processor; the storage circuit is used for receiving and storing data of the processor; the memory circuit is also capable of transmitting data to the processor;
the display circuit comprises a display screen; the display signal input end of the display screen is connected with the display signal output end of the processor; the display circuit is used for receiving and displaying the data of the processor;
the data connection end of the data transmission circuit is connected with the processor; the data transmission circuit is used for receiving and transmitting data of the processor; the data transmission circuit is also used for receiving data of external equipment and transmitting the data to the processor;
the processor sends a control signal to the fan driving circuit; the processor is used for receiving the rotating speed data of the rotating speed detection circuit, the current data of the current detection circuit and the voltage data of the voltage detection circuit and analyzing the received data; the processor also stores the received data in the storage circuit or sends the data in the storage circuit out through the data transmission circuit; the processor also displays the received data through the display circuit;
the test method of the EBM fan tester comprises the following steps:
s1, the processor sends a control signal to the drive circuit to make the drive circuit drive the fan with a fixed drive voltage; meanwhile, the voltage detection circuit, the rotating speed detection circuit and the current detection circuit respectively transmit the measured voltage, rotating speed and current data to the processor; the processor compares the received voltage, rotating speed and current data with the voltage, rotating speed and current data under the corresponding driving voltage prestored in the storage circuit and displays the comparison result through the display circuit;
s2, the processor sends out control signals to enable the driver to drive the fan with a plurality of different driving voltages; the processor compares the voltage, the rotating speed and the current data received under different driving voltages with the voltage, the rotating speed and the current data under the corresponding driving voltages prestored in the storage circuit and displays the comparison result through the display circuit.
2. The EBM fan tester as recited in claim 1, wherein: the voltage detection circuit comprises a second inductor (L3) connected with the positive electrode of the fan power supply, and the other end of the second inductor (L3) is connected with a nineteenth resistor (R57); the other end of the nineteenth resistor (R57) is connected with 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 with the positive electrode of the power supply; the anode of the fourth diode (D10-1), the tenth capacitor (C12), the cathode of the seventh polar 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 anode of the seventh polar capacitor (E12) are connected with 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 with the voltage signal input end of the processor;
the fan driving circuit comprises a first capacitor (R69) with one end connected to the PWM signal output end of the processor, the other end of the first capacitor (R69) is connected with the base electrode of a first triode (Q6) and one end of a second resistor (R75), and the other end of the second resistor (R75) and the emitter electrode of the first triode (Q6) are grounded together; a collector of the first triode (Q6) is connected with one end of a third resistor (R70), the other end of the third resistor (R70) is connected with one end of a fourth resistor (R61), one end of a fifth resistor (R76) and one end of a first capacitor (C19), the other end of the fifth resistor (R76) and the other end of the first capacitor (C19) are both connected with a grid electrode of a first PMOS (Q8), and the other end of the fourth resistor (R61) and a source electrode of the first PMOS (Q8) are connected to the positive electrode of a power supply in common; the drain of the first PMOS tube (Q8) is connected with the positive electrode of the first polar capacitor (E21), the positive electrode of the second polar capacitor (E20), the positive electrode of the third polar capacitor (E19), the positive electrode of the fourth polar 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 commonly grounded; the other end of the sixth resistor (R40) is connected with the negative electrode of the power supply of the fan;
the rotating speed detection circuit comprises a first inductor (L4) with one end connected to the positive pole of the fan power supply, a seventh resistor (R56) is connected to the other end of the first inductor (L4) in series, the other end of the seventh resistor (R56) is connected with the anode of a first diode (D9), the cathode of a second diode (D9-1), one end of a third capacitor (C4) and the signal input positive end of a first operational amplifier (U11A); the cathode of the first diode (D9) is connected with the anode 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 negative signal input end of the first operational amplifier (U11A) is connected with a ninth resistor (R68), a tenth resistor (R74), the negative power end of the first operational amplifier (U11A) and a 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 with the signal output end of the first operational amplifier (U11A) and an eleventh resistor (R59); the other end of the eleventh resistor (R59) is connected with the base of the second triode (Q7); the collector of the second triode (Q7) is connected with the twelfth resistor (R60) and the rotating speed signal input end of the processor; the other end of the twelfth resistor (R60) is connected with the positive electrode of the power supply; the emitter of the second triode (Q7) is grounded;
a current detection circuit eighth resistor (R65); one end of an eighth resistor (R65) is connected to the signal input positive terminal of the first operational amplifier (U11A), and the other end of the eighth resistor (R65) 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 connected to the positive signal input terminal of the second operational amplifier (U2B); the negative signal input terminal of the second operational amplifier (U2B) is connected with a fourteenth resistor (R62), a fifteenth resistor (R64) and a seventh capacitor (C23); the other end of the fourteenth resistor (R62) is grounded; the other end of the fifteenth resistor (R64), the other end of the sixteenth resistor (R20) and the other end of the seventh capacitor (C23) are connected to a signal output end of the second operational amplifier (U2B) in common; the other end of the sixteenth resistor (R20) is connected with the signal input positive terminal of the eighth capacitor (C22) and the third operational amplifier (U2A); the other end of the eighth capacitor (C22) is grounded; the signal input negative terminal of the third operational amplifier (U2A) is connected with a seventeenth resistor (R73), an eighteenth resistor (R67) and a 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 with the current signal input end of the processor; the positive power supply end of the third operational amplifier (U2A), the positive electrodes of the tenth capacitor (DC3) and the sixth polar capacitor (E11) are all connected with the positive electrode of the power supply; the negative power supply end of the third operational amplifier (U2A) is grounded.
3. The EBM fan tester as recited in claim 1, wherein: a socket is also arranged; the positive end of the socket is connected with the drain electrode of the first PMOS tube (Q8); the negative end of the socket is connected with one end of a sixth resistor (R40) far away from the ground; the fan is provided with a plug matched with the socket, so that the fan can be connected to a circuit through the plug.
4. The EBM fan tester as recited in claim 1, wherein: the data transmission circuit comprises a USB interface; the data connection end of the USB interface is connected with the processor.
5. The EBM fan tester as recited in claim 1, wherein: the data transmission circuit comprises a WIFI module; the data connection end of the WIFI module is connected with the processor.
6. The EBM fan tester as recited in claim 1, wherein: the storage circuit comprises an EEPROM memory; the data connection end of the EEPROM is connected with the data end of the processor.
7. The EBM fan tester as recited in claim 1, wherein: a key input module is also arranged; the signal output end of the key input circuit is connected with the key signal input end of the processor.
8. The EBM fan tester as recited in claim 1, wherein: the display screen is a TM12864L display screen.
9. The EBM fan tester as recited in claim 1, wherein: the processor is a PIC18F45K22 chip.
CN201911116980.0A 2019-11-15 2019-11-15 EBM fan tester Pending CN110748498A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911116980.0A CN110748498A (en) 2019-11-15 2019-11-15 EBM fan tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911116980.0A CN110748498A (en) 2019-11-15 2019-11-15 EBM fan tester

Publications (1)

Publication Number Publication Date
CN110748498A true CN110748498A (en) 2020-02-04

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Family Applications (1)

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CN201911116980.0A Pending CN110748498A (en) 2019-11-15 2019-11-15 EBM fan tester

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Country Link
CN (1) CN110748498A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113757156A (en) * 2021-09-16 2021-12-07 中国南方电网有限责任公司超高压输电公司昆明局 EBM fan testing method and device, computer equipment and computer storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113757156A (en) * 2021-09-16 2021-12-07 中国南方电网有限责任公司超高压输电公司昆明局 EBM fan testing method and device, computer equipment and computer storage medium
CN113757156B (en) * 2021-09-16 2023-09-26 中国南方电网有限责任公司超高压输电公司昆明局 EBM fan testing method and device, computer equipment and computer storage medium

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