CN205920126U - Detection apparatus for real -time supervision fan speed - Google Patents
Detection apparatus for real -time supervision fan speed Download PDFInfo
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- CN205920126U CN205920126U CN201620767203.8U CN201620767203U CN205920126U CN 205920126 U CN205920126 U CN 205920126U CN 201620767203 U CN201620767203 U CN 201620767203U CN 205920126 U CN205920126 U CN 205920126U
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- fan speed
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Abstract
The utility model discloses a detection apparatus for real -time supervision fan speed, including sampling circuit, filter circuit, buffer circuit, amplifier circuit and signal output part mouth, sampling circuit's one end is connected with the power port of fan and is used for gathering the current signal under the fan operating condition, sampling circuit's the other end is connected with filter circuit, filter circuit is connected with buffer circuit, buffer circuit is connected with amplifier circuit, amplifier circuit is connected with the signal output part mouth of output pulse signal. The utility model provides a pair of detection apparatus for real -time supervision fan speed through the operating current of real -time detection fan power end, changes the fluctuation of current voltage signal into then keeps apart through filtering and DC voltage and handle last output and fan speed pulse signal in relevancy to reach real -time detection fan speed's effect.
Description
Technical field
This utility model is related to circuit checker, more particularly, to a kind of detection means of real-time monitoring rotation speed of the fan.
Background technology
In practical application area, any cabinet inside all must be configured with radiating module, and any one radiating module occurs
Abnormal, cabinet inside heat all can be caused to assemble.Light then chip performance declines, and affects system work quality；Heavy then device burns,
Systemic breakdown.So it is necessary to realize the real-time monitoring to radiating module, once there is some while system worked well
Radiator fan is aging to lead to rotating speed decline or fan to damage the situation leading to stall it is necessary to report interface to report to the police.But it is not
The fan of every kind of specification has rotating speed retaking of a year or grade output lead, and customization fan can greatly increase the cost of equipment again.Reliability from system
The angle of property and cost control is set out, and the Rotating speed measring of two line fans just becomes advantageously.It is used in prior art detecting wind
The device circuit complex structure of fan work, needs to spend substantial amounts of cost, not economical and practical.
Utility model content
The utility model discloses a kind of detection means of real-time monitoring rotation speed of the fan, including sample circuit, filter circuit,
Isolation circuit, amplifying circuit and signal output port, one end of described sample circuit be connected with the power port of fan for
Current signal under collection fan operating state, the other end of described sample circuit is connected with filter circuit, described filtered electrical
Road is connected with isolation circuit, and described isolation circuit is connected with amplifying circuit, described amplifying circuit and output pulse signal
Signal output port is connected.
Described sample circuit includes sampling resistor b2r2, and described filter circuit includes resistance b2r4 and electric capacity b2c2, described
Resistance b2r4 and electric capacity b2c2 is connected in parallel, and described isolation circuit includes electric capacity e2c1, and described amplifying circuit includes voltage ratio relatively
Device lm339, described voltage comparator lm339 will detect the output of pulse signal being associated with rotation speed of the fan to signal output
Port.
Due to employing technique scheme, a kind of detection dress of real-time monitoring rotation speed of the fan that this utility model provides
Put, by the operating current at real-time detection fan power supply end, current fluctuation is changed into voltage signal and then passes through to filter and straight
Stream voltage isolation processing finally exports the pulse signal being associated with rotation speed of the fan, thus reaching the effect of real-time detection rotation speed of the fan
Really.Because its structure is simple, it is not only convenient for producing, and cost is very cheap is suitable to be widely popularized.
Brief description
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present utility model；
Fig. 2 is circuit theory diagrams of the present utility model.
Specific embodiment
For making the technical solution of the utility model and advantage clearer, with reference to attached in this utility model embodiment
Figure, carries out clearly complete description to the technical scheme in this utility model embodiment:
Operationally, flabellum often rotates one week to fan, and fan loop all changes of magnetic field can, with regard to phase on fan power supply
Periodic current fluctuation should occur.We need this curent change of sampling, and to monitor in the form of a voltage.In order to detect
More accurate, need to do low-pass filtering to voltage；This voltage pulsation compared to DC voltage be very small if it is desired to
This change in voltage is detected, need to remove the DC component of voltage；Finally we need change small for this voltage
Zoom into the big potential pulse being easy to gather；Pulse frequency has corresponding relation with the rotating speed of fan, and so we just can be complete
The real-time monitoring of rotation speed of the fan in pairs.Therefore we design a kind of detection dress of real-time monitoring rotation speed of the fan as shown in Figure 1
Put, including sample circuit 1, filter circuit 2, isolation circuit 3, amplifying circuit 4 and signal output port 5, one end of sample circuit 1
It is connected with the power port of fan for gathering the current signal under fan operating state, the other end of described sample circuit 1
It is connected with filter circuit 2, described filter circuit 2 is connected with isolation circuit 3, described isolation circuit 3 is connected with amplifying circuit 4
Connect, described amplifying circuit 4 is connected with the signal output port 5 of output pulse signal.
As shown in Figure 2: described sample circuit 1 includes sampling resistor b2r2, described filter circuit 2 includes resistance b2r4 and electricity
Hold b2c2, resistance b2r4 and electric capacity b2c2 to be connected in parallel, described isolation circuit 3 includes electric capacity e2c1, and described amplifying circuit 4 includes
Voltage comparator lm339, described voltage comparator lm339 will detect the output of pulse signal being associated with rotation speed of the fan extremely
Signal output port 5.
In circuit, resistance b2r2 completes voltage sample, and current fluctuation is changed into voltage signal.Rear class resistance b2r4 and electricity
Hold b2c2 and form simple passive low ventilating filter, the cut-off frequency of wave filter needs to be adjusted according to rotation speed of the fan.Exchange
The direct current component of sampled voltage is removed by coupled capacitor, and the electric resistance partial pressure of rear class provides suitable direct current for small voltage pulsation
Biasing.The positive input terminal of comparator lm339 selects suitable electrical voltage point it is ensured that the sampled signal of negative terminal is in positive terminal voltage both sides
Change, at this moment the output of comparator is exactly the pulse signal being associated with rotation speed of the fan.Lm339 exports for oc door, and it is suitable to select
Voltage pull-up, detection chip can be directly inputted to, complete implement monitoring.
The detection means circuit structure design of real-time monitoring rotation speed of the fan disclosed in this utility model is simple, accuracy of detection
Height, can extensively apply.
The above, only this utility model preferably specific embodiment, but protection domain of the present utility model is not
Be confined to this, any those familiar with the art in the technical scope that this utility model discloses, according to this practicality
New technical scheme and its utility model design in addition equivalent or change, all should cover in protection model of the present utility model
Within enclosing.
Claims (2)
1. a kind of detection means of real-time monitoring rotation speed of the fan it is characterised in that: include sample circuit (1), filter circuit (2),
Isolation circuit (3), amplifying circuit (4) and signal output port (5), one end of described sample circuit (1) and the power end of fan
Mouth is connected for gathering the current signal under fan operating state, the other end of described sample circuit (1) and filter circuit (2)
It is connected, described filter circuit (2) is connected with isolation circuit (3), described isolation circuit (3) is connected with amplifying circuit (4),
Described amplifying circuit (4) is connected with the signal output port (5) of output pulse signal.
2. a kind of detection means of real-time monitoring rotation speed of the fan according to claim 1, is further characterized in that: described sampling
Circuit (1) includes sampling resistor b2r2, and described filter circuit (2) includes resistance b2r4 and electric capacity b2c2, described resistance b2r4 and
Electric capacity b2c2 is connected in parallel, and described isolation circuit (3) includes electric capacity e2c1, and described amplifying circuit (4) includes voltage comparator
Lm339, described voltage comparator lm339 will detect the output of pulse signal being associated with rotation speed of the fan to signal output part
Mouth (5).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521069379 | 2015-12-18 | ||
| CN2015210693798 | 2015-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205920126U true CN205920126U (en) | 2017-02-01 |
Family
ID=57872279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620767203.8U Active CN205920126U (en) | 2015-12-18 | 2016-07-20 | Detection apparatus for real -time supervision fan speed |
Country Status (1)
| Country | Link |
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| CN (1) | CN205920126U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661927A (en) * | 2017-03-31 | 2018-10-16 | 佛山市顺德区美的电热电器制造有限公司 | Household appliance and radiating fan system for household appliance |
| CN114859071A (en) * | 2022-06-14 | 2022-08-05 | 北京斯年智驾科技有限公司 | Wheel speed acquisition module, device and method |
-
2016
- 2016-07-20 CN CN201620767203.8U patent/CN205920126U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661927A (en) * | 2017-03-31 | 2018-10-16 | 佛山市顺德区美的电热电器制造有限公司 | Household appliance and radiating fan system for household appliance |
| CN114859071A (en) * | 2022-06-14 | 2022-08-05 | 北京斯年智驾科技有限公司 | Wheel speed acquisition module, device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |