CN101004180A - Fan system, and low speed sensing device - Google Patents
Fan system, and low speed sensing device Download PDFInfo
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- CN101004180A CN101004180A CN 200610005065 CN200610005065A CN101004180A CN 101004180 A CN101004180 A CN 101004180A CN 200610005065 CN200610005065 CN 200610005065 CN 200610005065 A CN200610005065 A CN 200610005065A CN 101004180 A CN101004180 A CN 101004180A
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- signal
- rotating speed
- fan system
- speed
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Abstract
The present invention relates to a fan system. Said system includes a drive device, a low rotating speed detection device and a logic device. Said drive device can be used for producing a rotating speed detection signal and a predefined warning signal; said low rotating speed detection device is electrically connected with said driven device and is used fro receiving said rotating speed detection signal, and when said rotating speed detection signal is less than a reference signal, it can produce a low rotating speed signal; said logic device is respectively electrically connected with said drive device and said low rotating speed detection device, when said predefined warning signal or said low rotating speed signal is received by said logic device, said logic device can produce a warning signal.
Description
Technical field
The present invention relates to a kind of fan system and low speed sensing device thereof, particularly relate to a kind of fan system and low speed sensing device thereof with slow-speed of revolution alarm function.
Background technique
Along with electronic equipment towards high-performance, high frequency, high-speed and lightening developing rapidly, cause the heating temperature of electronic equipment more and more higher, thereby be easy to generate wild effect, influence production reliability, so heat radiation has become one of important topic of present electronic equipment.
Known technology utilizes a fan system as radiating structure usually, can normal operation to keep electronic equipment.See also shown in Figure 1, a kind of known fan system 10 mainly has a plurality of fans 11 and a plurality of driving chip 12, described fan 11 is connected in series (with gas flow direction) mutually, and the fan frame that the serial fashion of described fan 11 also can be described fan 11 interconnects.When stopping operating (for example the flabellum of this fan 11 is blocked by foreign matter) when arbitrary fan 11 faults, its corresponding this driving chip 12 can detect the situation that this fault fan 11 stops operating, and send a predetermined alarm signal RD (a for example high level voltage) to an electronic equipment 1, broken down so that warn this fan 11, in order to changing or overhaul this fault fan 11.
Yet, because of described fan 11 is to be connected in series mutually, this fault fan 11 may be driven and rotate by other fan, and this moment, this driving chip 12 of these fault fan 11 correspondences can't the detection failure situation and produce erroneous judgement, to such an extent as to can't send this alarm signal RD.
Therefore, the invention provides a kind of fan system and low speed sensing device thereof, to improve above-mentioned problem.
Summary of the invention
Because above-mentioned problem when purpose of the present invention is hanged down to cross when rotation speed of the fan for a kind of fan system and low speed sensing device thereof are provided, produces an alarm signal, reach due alarm function.
For achieving the above object, comprise a drive unit, a low speed sensing device and a logic device according to a kind of fan system of the present invention.This drive unit produces a rotating speed and detects a signal and a predetermined alarm signal; This low speed sensing device is electrically connected with this drive unit, receives this rotating speed and detects signal, and detect signal when being lower than a reference signal when this rotating speed, produces a slow-speed of revolution signal; This logic device is electrically connected with this drive unit and this low speed sensing device respectively, when reception should be scheduled to alarm signal or this slow-speed of revolution signal, produces an alarm signal according to this.
For achieving the above object, receive a rotating speed according to another kind of fan system of the present invention and detect signal, this fan system comprises a low speed sensing device and a logic device.This low speed sensing device receives this rotating speed and detects signal, and detects signal when being lower than a reference signal when this rotating speed, produces a slow-speed of revolution signal; This logic device is electrically connected with this low speed sensing device, when receiving this slow-speed of revolution signal, produces an alarm signal according to this.
For achieving the above object, according to the low speed sensing device of a kind of fan system of the present invention, this fan system has a drive unit and produces a rotating speed and detect signal, and this low speed sensing device comprises a signal processing unit and a comparing unit.This signal processing unit receives and detects signal according to this rotating speed, produces a corresponding tach signal; This comparing unit is electrically connected with this signal processing unit, receives this tach signal and a reference signal compares, and when this tach signal is lower than this reference signal, produces a slow-speed of revolution signal, produces an alarm signal according to this.
For achieving the above object, the low speed sensing device according to another kind of fan system of the present invention receives a rotating speed and detects signal, and this low speed sensing device comprises a signal processing unit and a comparing unit.This signal processing unit receives and detects signal according to this rotating speed, produces a corresponding tach signal; This comparing unit is electrically connected with this signal processing unit, receives this tach signal and a reference signal compares, and when this tach signal is lower than this reference signal, produces a slow-speed of revolution signal, produces an alarm signal according to this.
From the above, because of complying with a kind of fan system of the present invention and low speed sensing device thereof by the rotating speed that detects this fan, and cross when low at this rotation speed of the fan, produce this alarm signal, avoiding this fault fan to be driven and rotate by other fan, and can't the detection failure situation and the situation of sending this alarm signal take place.Compared to the prior art, the present invention, dually guarantees to reach due alarm function detecting fan failure really by the rotating speed that detects this fan.
Description of drawings
Fig. 1 is a schematic representation of a kind of known fan system;
Fig. 2 is a schematic representation of a kind of fan system of preferred embodiment of the present invention;
Fig. 3 is a circuit diagram of a kind of fan system of preferred embodiment of the present invention; And
Fig. 4 is a circuit diagram of a kind of fan system of another preferred embodiment of the present invention.
The reference numeral explanation:
1,2 electronic equipments, 10,20,40 fan systems
11 fans, 12 driving chip
21,41 drive units, 22,42 low speed sensing devices
221,421 signal processing units, 222,422 comparing units
23,43 logic device, 24,44 blower modules
25,45 Hall subassemblies, 26,46 switch gears
411 driving chip, 412 bridge drive circuits
P
1The first signal end P
2The secondary signal end
RD, RD ' are scheduled to alarm signal FG, FG ' rotating speed detects signal
V
1, V
1' tach signal V
L, V
L' slow-speed of revolution signal
Alarm alarm signal D
1～D
3Diode
Q
1～Q
3Switch block
R
1～R
3, R
LResistor C capacitor
U
1, U
3Amplifier U
2, U
4Comparator
G grid S source electrode
D drain electrode B base stage
C collection utmost point E emitter-base bandgap grading
Input
1First input end input
2Second input end
Output output terminal V
Ref, V
Ref' reference signal
Embodiment
Hereinafter with reference to a kind of fan system and the low speed sensing device thereof of relevant drawings explanation according to preferred embodiment of the present invention.
See also Fig. 2 and shown in Figure 3, be the schematic representation and the circuit diagram of a kind of fan system of preferred embodiment of the present invention.This fan system 20 can be used with an electronic equipment 2, and this fan system 20 comprises a drive unit 21, a low speed sensing device 22, a logic device 23 and a blower module 24.This blower module 24 has at least one fan.
This drive unit 21 can be a driving chip or one drive circuit, and it is electrically connected with this blower module 24, to control the rotating speed of this blower module 24.And this drive unit 21 has one first signal end P
1With a secondary signal end P
2, this first signal end P
1Can send a rotating speed and detect signal FG, and secondary signal end P
2Can send a predetermined alarm signal RD.
In present embodiment, it is that (Pulse WidthModulation, PWM) signal when this rotating speed detects signal FG frequency when high more, represent that the rotating speed of this blower module 24 is fast more to a pulse width modulation that this rotating speed detects signal FG.Though in present embodiment, this rotating speed detects signal FG and provided by this drive unit 21, is not limited to this, also can provide by a rotating speed detection components that adds (figure does not show).
Should can be a high-voltage level signal by predetermined alarm signal RD, it is these drive unit 21 inner predetermined alarm signals, when this blower module 24 damaged, this drive unit 21 can detect the situation that this blower module 24 stops operating, and sends this predetermined alarm signal RD.Wherein, this secondary signal end P of this drive unit 21
2Inside can an opener utmost point (open collector type) circuit, should predetermined alarm signal RD to produce.
This low speed sensing device 22 comprises a signal processing unit 221 and a comparing unit 222.This signal processing unit 221 is electrically connected with this drive unit 21 and detects signal FG in order to receive this rotating speed, and detects signal FG according to this rotating speed and produce a corresponding tach signal V
1, handle in order to subsequent conditioning circuit.
As shown in Figure 3, this signal processing unit 221 comprises one first switch block Q
1, at least one capacitor C, a diode D
1, an amplifier U
1And a plurality of resistor R
1～R
3Wherein, this first switch block Q
1Can be a transistor or other has the electrical assembly of switching function.
In the present embodiment, this first switch block Q
1Be a NPN transistor, have a base stage B, a collection utmost point C and an emitter-base bandgap grading E, this base stage B receives this rotating speed and detects signal FG, and this collection utmost point C sees through this diode D
1C is electrically connected with this capacitor, this emitter-base bandgap grading E ground connection.In addition, this resistor R
1An end be electrically connected the other end ground connection with this capacitor C.
This amplifier U
1Has a first input end input
1, one second input end input
2With an output terminal output.Wherein, this first input end input
1Be a normal phase input end, this second input end input
2Be an inverting input, this first input end input
1C is electrically connected with this capacitor, this second input end input
2With this resistor R
2An end be electrically connected and this resistor R
2A other end ground connection; This second input end input
2With this output terminal output by this resistor R
3Be electrically connected, to form a positive amplifier.
In present embodiment, be pwm signal because this rotating speed detects signal FG, therefore by this capacitor C, this resistor R
1Charge characteristic is converted to voltage signal with pwm signal, and through this amplifier U
1After the amplification, produce corresponding this tach signal V
1, handle in order to subsequent conditioning circuit.
In the present embodiment, when the rotating speed of this blower module 24 was low more, the frequency of pwm signal was low more, therefore corresponding this tach signal V
1Then high more.Otherwise, when these blower module 24 rotating speeds are high more, this tach signal V
1Low more.
This comparing unit 222 comprises a comparator U
2, have first input end input
1, one second input end input
2With an output terminal output.Wherein, this first input end input
1Be a normal phase input end, this second input end input
2It is an inverting input.This first input end input
1Be electrically connected with this signal processing unit 221, in order to receive this tach signal V
1, this second input end input
2Receive a reference signal V
Ref(deciding according to actual demand) as the whether low excessively reference value of the rotating speed of judging this blower module 24.
This comparing unit 222 is with this tach signal V
1With this reference signal V
RefCompare, as this tach signal V
1Be higher than this reference signal V
RefThe time, judge that promptly these blower module 24 rotating speeds are low excessively, so this output terminal output promptly produces a slow-speed of revolution signal V
L(being a positive voltage level signal) is with the usefulness as caution.
This logic device 23 comprises a plurality of diode D
2, D
3, a second switch assembly Q
2And one the 3rd switch block Q
3Wherein, this second switch assembly Q
2With the 3rd switch block Q
3Can be a transistor respectively or other has the electrical assembly of switching function; In the present embodiment, this second switch assembly Q
2Be a nmos pass transistor, the 3rd switch block Q
3It is a NPN transistor.
This second switch assembly Q
2A drain D and the 3rd switch block Q
3A base stage B be electrically connected this second switch assembly Q
2One source pole S ground connection.The 3rd switch block Q
3An emitter-base bandgap grading E ground connection, the 3rd switch block Q
3A collection utmost point C be electrically connected with this electronic equipment 2, to send an alarm signal alarm, at this, this alarm signal alarm is a high-voltage level signal.
This diode D
2An end and this secondary signal end P of this drive unit 21
2Be electrically connected, should predetermined alarm signal RD to receive.This diode D
3An end be electrically connected with this comparing unit 222 of this low speed sensing device 22, to receive this slow-speed of revolution signal V
L, and this diode D
2A other end and this diode D
3A other end both be electrically connected, to form one or door (OR GATE).
This diode D
2, D
3This other end and this second switch assembly Q
2A grid G be electrically connected, to receive this desired speed signal RD or this slow-speed of revolution signal V
L, and according to this desired speed signal RD or this slow-speed of revolution signal V
LTo control this second switch assembly Q
2, the 3rd switch block Q
3Whether conducting, and then determine whether produce this alarm signal alarm to this electronic equipment 2, to warn the failure situations of this fan system 20.
These fan system 20 modes of operation of present embodiment are as follows: when this blower module 24 stopped operating, this drive unit 21 detected this blower module 24 and stops operating, and sends this predetermined alarm signal RD to this logic device 23, makes this diode D
2, this second switch assembly Q
2Conducting, and the 3rd switch block Q
3Not conducting, the 3rd switch block Q at this moment
3Collection utmost point C then can send this alarm signal alarm, break down to warn this fan system 20.
Yet when this blower module 24 fan wherein broke down, this fault fan was subjected to other fan (figure does not show) to drive and rotate, and in this case, this drive unit 21 can not send this predetermined alarm signal RD.
At this moment, 22 these rotating speeds that receive its correspondence of this low speed sensing device detect signal FG, and carry out signal processing to produce corresponding this tach signal V by this signal processing unit 221 again
1, compare in order to this comparing unit 222, rotate owing to this fault fan drives by other fan, so this rotating speed of its correspondence to detect the frequency of signal FG very low, this moment this tach signal V
1Be higher than this reference signal V
Ref, then 222 of this comparing units produce this slow-speed of revolution signal V
LTo this logic device 23.
Then, this logic device 23 is according to this slow-speed of revolution signal V
LProduce this alarm signal alarm to this electronic equipment 2, break down to warn this fan system 20.
As mentioned above, this fan system 20 is by the rotating speed that detects this blower module 24, and crosses when low at these blower module 24 rotating speeds, produces this alarm signal alarm, avoiding this fault fan to be driven and rotate, and cause the situation of this alarm signal alarm mistake to produce by other fan.
In addition, this fan system 20 of present embodiment also can comprise a Hall subassembly (Hall element) 25 and one switch gear 26.Wherein, this Hall subassembly 25 is in order to detect the rotor-position of this blower module 24.And this switch gear 26 is electrically connected with this Hall subassembly 25 and this logic device 23, when this switch gear 26 receives this alarm signal alarm, can close the power supply of this Hall subassembly 25, so that this fan system 20 decommissions, to reach the effect of protection.In addition, this switch gear 26 also can be directly and this diode D
2, D
3This other end be electrically connected, as this diode D
2, D
3Receive this desired speed signal RD or this slow-speed of revolution signal V
LThe time, promptly this switch gear 26 of may command cuts out the power supply of this Hall subassembly 25, to reach the effect of protection.Moreover this switch gear 26 can directly be electrically connected with this low speed sensing device 22, when this low speed sensing device 22 is sent this slow-speed of revolution signal V
LThe time, then this switch gear 26 cuts out the power supply of this Hall subassembly 25, to reach the effect of protection.
See also shown in Figure 4ly, be the circuit diagram of a kind of fan system of another preferred embodiment of the present invention.This fan system 40 comprises a drive unit 41, a low speed sensing device 42, a logic device 43 and a blower module 44.Wherein, this logic device 43 and this blower module 44 are as this logic device 23 and this blower module 24 of the foregoing description, and it has identical formation and function, is not given unnecessary details at this.
This drive unit 41 of present embodiment comprises a driving chip 411 and a bridge drive circuit 412.This driving chip 411 can be sent a predetermined alarm signal RD '; This bridge drive circuit 412 rotates reaching the effect of heat radiation in order to drive this blower module 44, and this bridge drive circuit 412 can provide a rotating speed to detect signal FG '.In present embodiment, this bridge drive circuit 412 has a resistor R
L, and this rotating speed detects signal FG ' for this resistor R
LThe magnitude of voltage at two ends, therefore when the rotating speed of this blower module 44 is low more, this resistor R of flowing through
LElectric current diminish, then this rotating speed magnitude of voltage of detecting signal FG ' descends.Otherwise, when the rotating speed of this blower module 44 is high more, this resistor R of flowing through
LElectrorheological big, then this rotating speed magnitude of voltage of detecting signal FG ' rises.
This low speed sensing device 42 comprises a signal processing unit 421 and a comparing unit 422.Wherein, this signal processing unit 421 comprises an amplifier U
3, detect signal FG ' in order to amplify this rotating speed, to produce a corresponding tach signal V
1'.
This comparing unit 422 comprises a comparator U
4, have first input end input
1, one second input end input
2With an output terminal output.Wherein, this first input end input
1Be an inverting input, this second input end input
2It is a normal phase input end.This second input end input
2Receive a reference signal V
Ref' (deciding according to actual demand, as the whether low excessively reference value of the rotating speed of judging this fan 44).This first input end input
1Be electrically connected with this signal processing unit 421, in order to receive this tach signal V
1'.
This signal processing unit 421 detects signal FG ' with this rotating speed and is amplified, to produce corresponding this tach signal V
1', again by this comparing unit 422 with this tach signal V
1' and this reference signal V
Ref' compare, as this tach signal V
1' be lower than this reference signal V
Ref' time, this output terminal output promptly produces this slow-speed of revolution signal V
L' (being a positive voltage level signal) deliver to this logic device 43, to carry out the action of this alarm signal of follow-up generation alarm, its operating principle is not given unnecessary details at this as above-mentioned.
This fan system 40 of present embodiment also can comprise a switch gear 46 and a Hall subassembly 45, and it has identical formation and function as above-mentioned this switch block 26 and this Hall subassembly 25, is not given unnecessary details at this.
In addition, the present invention also discloses a kind of low speed sensing device, and it is not given unnecessary details at this as this above-mentioned low speed sensing device 22 or 42.
In sum, because of complying with a kind of fan system of the present invention and low speed sensing device thereof is by the rotating speed that detects this fan, and cross when low at this rotation speed of the fan, produce this alarm signal, avoiding this fault fan to be driven and rotate by other fan, and can't the detection failure situation and the situation of sending this alarm signal take place.Compared to the prior art, the present invention, dually guarantees to realize due alarm function detecting fan failure really by the rotating speed that detects this fan.
The above is only for illustrating, rather than limitation of the present invention.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the claim of the present invention its equivalent modifications of carrying out or change.
Claims (15)
1, a kind of fan system comprises:
One drive unit produces a rotating speed and detects a signal and a predetermined alarm signal;
One low speed sensing device is electrically connected with this drive unit, receives this rotating speed and detects signal, and detect signal when being lower than a reference signal when this rotating speed, produces a slow-speed of revolution signal; And
One logic device is electrically connected with this drive unit and this low speed sensing device respectively, when reception should be scheduled to alarm signal or this slow-speed of revolution signal, produces an alarm signal according to this.
2, a kind of fan system receives a rotating speed and detects a signal and a predetermined alarm signal, and this fan system comprises:
One low speed sensing device receives this rotating speed and detects signal, and detects signal when being lower than a reference signal when this rotating speed, produces a slow-speed of revolution signal; And
One logic device is electrically connected with this low speed sensing device, when this slow-speed of revolution signal of reception maybe should be scheduled to alarm signal, produces an alarm signal according to this.
3, fan system as claimed in claim 1 or 2, wherein this low speed sensing device comprises:
One signal processing unit receives and detects signal according to this rotating speed, produces a corresponding tach signal; And
One comparing unit is electrically connected with this signal processing unit, receives this tach signal and this reference signal compares, and when this tach signal is lower than this reference signal, produces this slow-speed of revolution signal.
4, fan system as claimed in claim 3, wherein this signal processing unit comprises an amplifier, receives this rotating speed and detects signal, and convert corresponding this tach signal to.
5, fan system as claimed in claim 4, wherein this signal processing unit comprises:
One first switch block receives this rotating speed and detects signal; And
One capacitor is electrically connected with this first switch block, this amplifier, wherein this rotating speed detect signal by this first switch block, this capacitor and this amplifier to convert this tach signal to.
6, fan system as claimed in claim 5, wherein this first switch block is a NPN transistor, has a base stage, the collection utmost point and an emitter-base bandgap grading, and this base stage receives this rotating speed and detects signal, and this collection utmost point is connected this emitter grounding with this capacitor electrode.
7, fan system as claimed in claim 3, wherein this comparing unit comprises a comparator, has first input end, one second input end and an output terminal, and this first input end receives this tach signal, this second input end receives this reference signal, and this output terminal produces this slow-speed of revolution signal.
8, fan system as claimed in claim 7, wherein this first input end is a normal phase input end, and this second input end is an inverting input, or this first input end is an inverting input, and this second input end is a normal phase input end.
9, as claim 1 or 8 described fan systems, wherein this drive unit is a driving chip or a bridge drive circuit.
10, fan system as claimed in claim 9, wherein this bridge drive circuit has a resistor, and this rotating speed detects the magnitude of voltage of signal for these resistor two ends.
11, fan system as claimed in claim 1 or 2, wherein this logic device comprises:
One first diode, the one end is electrically connected with this drive unit, should be scheduled to alarm signal to receive; And
One second diode, the one end is electrically connected with this low speed sensing device, and to receive this slow-speed of revolution signal, wherein a other end of this first diode is electrically connected with a other end of this second diode, to send this predetermined alarm signal or this slow-speed of revolution signal.
12, fan system as claimed in claim 11, wherein this logic device also comprises:
One second switch assembly, this other end with this first diode and this second diode is electrically connected respectively, should be scheduled to alarm signal or this slow-speed of revolution signal to receive; And
One the 3rd switch block is connected with this second switch electrical component, and produces this alarm signal according to being scheduled to alarm signal or this slow-speed of revolution signal.
13, fan system as claimed in claim 12, wherein this second switch assembly and the 3rd switch block are respectively a transistor.
14, fan system as claimed in claim 1 or 2 also comprises:
One Hall subassembly; And
One switch gear is electrically connected with this Hall subassembly and this logic device, when this switch gear receives this alarm signal, promptly closes this Hall subassembly.
15, fan system as claimed in claim 1 or 2 also comprises a blower module, and it has at least one fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100050650A CN100513799C (en) | 2006-01-17 | 2006-01-17 | Fan system and low speed sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100050650A CN100513799C (en) | 2006-01-17 | 2006-01-17 | Fan system and low speed sensing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101004180A true CN101004180A (en) | 2007-07-25 |
| CN100513799C CN100513799C (en) | 2009-07-15 |
Family
ID=38703518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100050650A Active CN100513799C (en) | 2006-01-17 | 2006-01-17 | Fan system and low speed sensing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100513799C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080664A (en) * | 2009-12-01 | 2011-06-01 | 技嘉科技股份有限公司 | Radiating system and control method thereof |
| CN103176887A (en) * | 2011-12-20 | 2013-06-26 | 马克西姆综合产品公司 | Method and apparatus for monitoring electromechanical device performance and reliability |
| US8519857B2 (en) | 2008-09-03 | 2013-08-27 | Hewlett-Packard Development Company, L.P. | Systems and methods of controlling a fan in an electronic system |
| CN104199529A (en) * | 2014-09-16 | 2014-12-10 | 山东超越数控电子有限公司 | Intelligent computerized fan control method |
| CN110657122A (en) * | 2019-10-11 | 2020-01-07 | 锐捷网络股份有限公司 | Fan rotating speed detection circuit and electronic equipment |
| CN110736300A (en) * | 2018-07-20 | 2020-01-31 | Bsh家用电器有限公司 | Domestic refrigeration device with a speed-controlled ventilation device and method for operating the same |
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2006
- 2006-01-17 CN CNB2006100050650A patent/CN100513799C/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8519857B2 (en) | 2008-09-03 | 2013-08-27 | Hewlett-Packard Development Company, L.P. | Systems and methods of controlling a fan in an electronic system |
| CN102080664A (en) * | 2009-12-01 | 2011-06-01 | 技嘉科技股份有限公司 | Radiating system and control method thereof |
| CN103176887A (en) * | 2011-12-20 | 2013-06-26 | 马克西姆综合产品公司 | Method and apparatus for monitoring electromechanical device performance and reliability |
| US10257959B2 (en) | 2011-12-20 | 2019-04-09 | Maxim Integrated Products, Inc. | Method and apparatus for monitoring electromechanical device performance and reliability |
| CN103176887B (en) * | 2011-12-20 | 2019-04-23 | 马克西姆综合产品公司 | Method and apparatus for monitoring the Performance And Reliability of electromechanical equipment |
| CN104199529A (en) * | 2014-09-16 | 2014-12-10 | 山东超越数控电子有限公司 | Intelligent computerized fan control method |
| CN110736300A (en) * | 2018-07-20 | 2020-01-31 | Bsh家用电器有限公司 | Domestic refrigeration device with a speed-controlled ventilation device and method for operating the same |
| CN110736300B (en) * | 2018-07-20 | 2022-09-16 | Bsh家用电器有限公司 | Method for operating a domestic refrigeration device and domestic refrigeration device |
| CN110657122A (en) * | 2019-10-11 | 2020-01-07 | 锐捷网络股份有限公司 | Fan rotating speed detection circuit and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100513799C (en) | 2009-07-15 |
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