CN219758284U - Detection circuit and device for rotating speed of switch fan - Google Patents
Detection circuit and device for rotating speed of switch fan Download PDFInfo
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- CN219758284U CN219758284U CN202321120210.5U CN202321120210U CN219758284U CN 219758284 U CN219758284 U CN 219758284U CN 202321120210 U CN202321120210 U CN 202321120210U CN 219758284 U CN219758284 U CN 219758284U
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 10
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- 101000900567 Pisum sativum Disease resistance response protein Pi49 Proteins 0.000 claims description 8
- 101000621511 Potato virus M (strain German) RNA silencing suppressor Proteins 0.000 claims description 8
- 238000004378 air conditioning Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 3
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- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
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- 238000012423 maintenance Methods 0.000 description 2
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Abstract
The utility model relates to the field of fan rotation speed detection, in particular to a detection circuit and a detection device for the rotation speed of a fan of a switch, comprising a fan power supply circuit; the sampling circuit is electrically connected with the fan power supply circuit, and the analysis circuit is electrically connected with the sampling circuit; the analysis circuit includes: INA230; an MCU electrically connected to the INA230; and ATE electrically connected to the MCU; the I2C port of the INA230 is correspondingly connected with the 11 th pin and the 12 th pin of the MCU respectively, and the two groups of standard serial ports of the MCU are electrically connected with the 11 th pin and the 12 th pin of the ATE respectively; the utility model can accurately detect the rotating speed of the fan of the exchanger, automatically screen the fan with abnormal rotating speed, and solve the problem of inaccurate observation by naked eyes; the device can be applied to production test, a set of equipment is put into operation, all switch projects can be used (including a management type switch), the high utilization rate of equipment is guaranteed, and the production detection efficiency is improved.
Description
Technical Field
The utility model relates to the field of fan rotation speed detection, in particular to a detection circuit and device for detecting the rotation speed of a fan of a switch.
Background
The management type switch is characterized in that a CPU of the switch controls a frequency generator and a PWM fan to detect and control the rotating speed; however, the non-network management type Ethernet switch has no CPU, can not detect and control the rotation speed of the fan, and can only detect the control in the production link.
The common detection scheme for the rotation speed of the fan of the non-network management type switch is to visually check whether the fan rotates, so that whether the rotation frequency of the fan meets the standard cannot be checked.
The factors such as complete machine assembly cause abnormal fan rotating speed or even cause blocking abnormal sound, if the fan rotating speed is not effectively intercepted in a production line, the fan is sold to an end user for a period of time to be easy to expose, and poor heat dissipation or abnormal function of the product is caused.
Disclosure of Invention
Aiming at the technical problems in the prior art, the utility model provides a circuit and a device for detecting the rotating speed of a fan of a switch so as to effectively detect the rotating speed of the fan and prevent the fan which does not meet the rotating speed requirement from flowing into the market.
The technical scheme for solving the technical problems is as follows:
there is provided a detection circuit for a rotational speed of a fan of a switch, including:
a fan power supply circuit;
the sampling circuit is electrically connected with the fan power supply circuit; a kind of electronic device with high-pressure air-conditioning system
An analysis circuit electrically connected to the sampling circuit;
the analysis circuit includes:
INA230；
an MCU electrically connected to the INA230; and
ATE electrically connected to the MCU;
the I2C port of INA230 is respectively and correspondingly connected with the 11 th pin and the 12 th pin of MCU, and the two groups of standard serial ports of MCU are respectively and electrically connected with the 11 th pin and the 12 th pin of ATE.
Optionally, the input voltage of the fan power supply circuit is 12V, a first path of the 12V voltage is grounded through four parallel filter capacitors, and a second path of the 12V voltage is connected in series with the fan and grounded through a PR10 high-precision resistor.
Optionally, two of the four filter capacitors have a capacitance value of 22uF, and the other two filter capacitors have capacitance values of 1uF and 0.1uF, respectively.
Optionally, the resistance of the PR10 high precision resistor is 2mohm.
Optionally, the sampling circuit includes:
PR11 high precision resistance;
PR12 high precision resistance; a kind of electronic device with high-pressure air-conditioning system
A patch capacitor;
the first end of the PR11 high-precision resistor and the first end of the PR12 high-precision resistor are respectively connected to two ends of the PR10 high-precision resistor;
the patch capacitor is connected in parallel between the second end of the PR11 high-precision resistor and the second end of the PR12 high-precision resistor;
the second end of the PR11 high-precision resistor is an IN+ signal end, the second end of the PR12 high-precision resistor is an IN-signal end, and the IN+ signal end and the IN-signal end are respectively connected with the 13 th pin of the INA230 and the 12 th pin of the INA 230.
Optionally, the patch capacitor has a capacitance value of 0.22uF.
There is provided a detection apparatus for a rotational speed of a fan of a switch, the detection apparatus comprising:
a 12V fan power module;
the INA230 data acquisition module is electrically connected with the 12V fan power supply module;
the MCU frequency calculation module is electrically connected with the INA230 data acquisition module;
the ATE visual interface input/output module is electrically connected with the MCU frequency calculation module; a kind of electronic device with high-pressure air-conditioning system
The detection circuit for the rotation speed of the switch fan is described above.
The beneficial effects of the utility model are as follows:
the utility model can accurately detect the rotating speed of the fan of the exchanger, automatically screen the fan with abnormal rotating speed, and solve the problem of inaccurate observation by naked eyes; the device can be applied to production test, a set of equipment is put into operation, all switch projects can be used (including a management type switch), the high utilization rate of equipment is guaranteed, and the production detection efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the fan power supply and sampling circuit of the detection circuit of the present utility model;
FIG. 2 is a schematic diagram of INA230 wiring of the detection circuit of the present utility model;
FIG. 3 is a schematic diagram of the wiring of the MCU and ATE of the detection circuit of the present utility model;
FIG. 4 is a schematic diagram of the connection relationship between each module of the detecting device of the present utility model;
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model. Furthermore, it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the present utility model.
In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "left," "right," "horizontal," "top," "bottom," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different structures of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize applications of other processes and/or usage scenarios for other materials.
The present utility model provides the following preferred embodiments:
referring to fig. 1 to 3, the circuit design is as follows:
a detection circuit for a rotational speed of a fan of a switch, comprising:
(1) And a fan power supply circuit, wherein PR10 is a high-precision resistor with a resistance value of 2mohm, and the voltage at two ends of PR10 can be sampled through the potential difference at two ends of PR 10.
(2) The sampling circuit transmits the IN+ and IN-two signals to INA230 for ADC analysis, and the data of the actual current corresponding time IN the circuit can be calculated.
(3) INA230 transmits data to MCU through I2C, and MCU calculates the fluctuation frequency of current to output data to ATE through UART interface, ATE equipment passes through the fan magnetic pole number of staff input, through the formula:
r (fan speed) =f (current frequency) ×60/number of poles. And judging whether the rotating speed of the fan is normal according to the result.
It is understood that INA230 is a current splitting and power monitor with an I2C interface, with 16 programmable addresses.
The device has high-side or low-side sensing functions, and can monitor shunt voltage drop and bus power supply voltage. The programmable calibration values, switching times and average values, in combination with the internal multipliers, can be read directly as current in amperes and power in watts.
INA230 can detect current on the bus ranging from 0V to +28V, and the device is powered by a +2.7V to +5.5V single power supply, consuming 330 μA (typical value) of supply current. Its rated operating temperature ranges from-40 deg.c to +125 deg.c, with high accuracy, gain error of 0.5% (maximum) and 50 μv offset (maximum).
The I2C ports of the INA230 are SDA (serial data line) and SCL (serial clock line) ports, which are bi-directional I/O lines, and the interface circuit is an open drain output, and is connected to the power supply VCC through a pull-up resistor. When the bus is idle, both lines are high level, the external devices connected with the bus are CMOS devices, and the output stage is also an open-drain circuit. The current drawn on the bus is small and therefore the number of devices spread on the bus is primarily determined by the capacitive load, since the bus interface of each device has some equivalent capacitance. And the capacitance in the line affects the bus transfer speed. When the capacitance is excessively large, transmission errors may be caused. Therefore, the load capacity is 400pF, so that the bus allowable length and the number of connected devices can be estimated.
The master is used to initiate bus transfer of data and generate a clock to open the transferred devices, any addressed device being considered a slave. The relationship of master and slave, transmit and receive on the bus is not constant but depends on the direction of data transfer at this time. If the host computer is to send data to the slave device, the host computer firstly addresses the slave device, then actively sends the data to the slave device, and finally the host computer terminates the data transmission; if the host is to receive data from the slave, the slave is first addressed by the master. The host then receives the data sent from the device, and finally the host terminates the reception process. In this case. The host is responsible for generating the timing clock and terminating the data transfer.
Further, referring to fig. 4, a detecting apparatus for a rotational speed of a fan of a switch, the detecting apparatus comprising:
a 12V fan power module;
the INA230 data acquisition module is electrically connected with the 12V fan power supply module;
the MCU frequency calculation module is electrically connected with the INA230 data acquisition module;
the ATE visual interface input/output module is electrically connected with the MCU frequency calculation module; a kind of electronic device with high-pressure air-conditioning system
The detection circuit for the rotation speed of the switch fan is described above.
1. According to the principle and method that the CPU converts the fluctuation frequency of the current into the rotating speed of the fan:
1. the working principle of the DC fan is that a conductor passes through current, a magnetic field is generated around the conductor, and then the conductor is placed in a fixed magnetic field, and suction force or repulsive force is generated, so that rotation is formed. However, after the magnetic pole rotates, the magnetic pole moves in a magnetic field, and according to Lenz's law, the conductor generates induced current and finally feeds back to the power supply current, and regular fluctuation occurs, and the frequency of the fluctuation is the frequency of the magnetic pole rotation.
2. Because the frequency F is in units of "times/second", the fan speed is typically in units of "minutes", and is therefore multiplied by the time coefficient 60. The number of magnetic poles of the fan is 4, and the rotating current of each magnetic pole can be changed, but the fan can be counted as one turn after the 4 magnetic poles are rotated once. Therefore, the fan rotation speed R can be obtained by dividing F1 in "minutes" by 4. I.e. r=f60/4. The unit is "rpm".
Note that:
(1) The number of poles is independent of the number of blades of the fan, for example, the number of blades of the fan is 5 and the number of poles is 4.
(2) The number of possible poles of different fans is also different, and the coefficient needs to be adjusted according to the actual situation, so that the fan can be confirmed in advance by a fan provider.
2. Setting a range interval of normal fan rotation speed as a judging basis of the CPU:
taking the V2724XT project as an example, the criterion is 10%
The maximum rotation speed is 10000 (revolutions per minute) and is 9000 to 11000 (revolutions per minute)
The rotation speed of the downshift is 7600 (revolutions per minute), and the maximum value is 6840-8360 (revolutions per minute)
The method is accurate and effective through practical tests, and the error is less than 1% even compared with a management type rotating speed measuring method.
3. Determination of the extracted fan speed by detection and analysis:
the CPU compares the detected and analyzed fan rotating speed R1 with a preset range interval in which the fan rotating speed is normal;
if the goods are within the range, the goods delivery requirements are met;
and if the maintenance is not in the range, screening out maintenance.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.
Claims (7)
1. A detection circuit for a rotational speed of a fan of a switch, the detection circuit comprising:
a fan power supply circuit;
the sampling circuit is electrically connected with the fan power supply circuit; a kind of electronic device with high-pressure air-conditioning system
An analysis circuit electrically connected to the sampling circuit;
the analysis circuit includes:
INA230；
an MCU electrically connected to the INA230; and
ATE electrically connected to the MCU;
the I2C port of INA230 is respectively and correspondingly connected with the 11 th pin and the 12 th pin of MCU, and the two groups of standard serial ports of MCU are respectively and electrically connected with the 11 th pin and the 12 th pin of ATE.
2. The circuit for detecting the rotational speed of a fan of a switch according to claim 1, wherein the input voltage of the fan power supply line is 12V, a first path of the 12V voltage is grounded through four parallel filter capacitors, and a second path of the 12V voltage is connected in series with the fan and grounded through a PR10 high-precision resistor.
3. The circuit for detecting the rotational speed of a fan of a switch according to claim 2, wherein two of the four filter capacitors have a capacitance of 22uF and the other two filter capacitors have a capacitance of 1uF and 0.1uF, respectively.
4. A detection circuit for a rotational speed of a fan of a switch as claimed in claim 3, wherein the PR10 high precision resistor has a resistance value of 2m ohm.
5. The circuit for detecting rotational speed of a fan of a switch of claim 4, wherein the sampling circuit comprises:
PR11 high precision resistance;
PR12 high precision resistance; a kind of electronic device with high-pressure air-conditioning system
A patch capacitor;
the first end of the PR11 high-precision resistor and the first end of the PR12 high-precision resistor are respectively connected with the two ends of the PR10 high-precision resistor;
the patch capacitor is connected in parallel between the second end of the PR11 high-precision resistor and the second end of the PR12 high-precision resistor;
the second end of the PR11 high-precision resistor is an IN+ signal end, the second end of the PR12 high-precision resistor is an IN-signal end, and the IN+ signal end and the IN-signal end are respectively connected with the 13 th pin of the INA230 and the 12 th pin of the INA 230.
6. The circuit for detecting rotational speed of a fan in a switch of claim 5, wherein the capacitance of the patch capacitor is 0.22uF.
7. A detection device for a rotational speed of a fan of a switch, the detection device comprising:
a 12V fan power module;
the INA230 data acquisition module is electrically connected with the 12V fan power supply module;
the MCU frequency calculation module is electrically connected with the INA230 data acquisition module;
the ATE visual interface input/output module is electrically connected with the MCU frequency calculation module; a kind of electronic device with high-pressure air-conditioning system
A detection circuit for a rotational speed of a fan of a switch as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321120210.5U CN219758284U (en) | 2023-05-11 | 2023-05-11 | Detection circuit and device for rotating speed of switch fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321120210.5U CN219758284U (en) | 2023-05-11 | 2023-05-11 | Detection circuit and device for rotating speed of switch fan |
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| CN219758284U true CN219758284U (en) | 2023-09-26 |
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| CN202321120210.5U Active CN219758284U (en) | 2023-05-11 | 2023-05-11 | Detection circuit and device for rotating speed of switch fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110770A (en) * | 2023-10-23 | 2023-11-24 | 深圳华夏恒泰电子有限公司 | Industrial fan security performance detection device |
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2023
- 2023-05-11 CN CN202321120210.5U patent/CN219758284U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110770A (en) * | 2023-10-23 | 2023-11-24 | 深圳华夏恒泰电子有限公司 | Industrial fan security performance detection device |
| CN117110770B (en) * | 2023-10-23 | 2024-01-02 | 深圳华夏恒泰电子有限公司 | Industrial fan security performance detection device |
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