CN102900689B - A kind of fan speed-regulating alarm system - Google Patents
A kind of fan speed-regulating alarm system Download PDFInfo
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Abstract
A kind of fan speed-regulating alarm system, the present invention relates to technical field of electronic equipment, particularly relates to a kind of fan alarm system.The present invention by arranging reference diode and current limliting quenching resistor provides different negative supply voltages respectively to backboard and alarm display for indicating in negative voltage power supply, utilize the control that multiple control channel of being connected with backboard respectively and speed controller for fan realize the many gears of fan speed simultaneously, to reduce redundancy, and adopt logic gates to carry out logical operation to fan warning information, and then guarantee that any one fan Shi Junhui that breaks down carries out reporting to the police, showing, and the fan of alert device attendant to fault is safeguarded timely.
Description
Technical field
The present invention relates to technical field of electronic equipment, particularly relate to a kind of fan alarm system.
Background technique
At present, along with improving constantly of modern electronic equipment traffic handing capacity, and supporting business kind is on the increase, electronic apparatus system power dissipation density is also just corresponding to be increased thereupon gradually, this just requires more and more higher to the radiation system in electronic apparatus system, especially, in communication system equipment, the requirement for radiation system is higher.
In prior art, the radiation system of electronic equipment adopts forced air cooling radiating mode usually, is mainly dispelled the heat by fan, and in order to the noise that can reduce equipment and power consumption, mostly adopts speed adjustable fan.Existing speed adjustable fan is mainly by setting the rotating speed of several temperature spots and fan, and fan is adjusted to one grade of corresponding rotating speed by the temperature then collected according to temperature transducer.
Although existing speed adjustable fan temperature environmentally can be operated in a suitable rotating speed, but its redundancy, noise are still larger, and alarm and display can not be carried out timely when fan cisco unity malfunction, bring certain hidden danger to the safe operation of electronic equipment.
Summary of the invention
For the problems referred to above existed in existing fan alarm system, a kind of speed governing alarm system that can realize low redundancy, little noise is now provided, while realizing that many grades of speed governing are carried out to fan, can report to the police fast when fan produces fault, with timely alert device attendant, electronic equipment be safeguarded.
The object of the invention is to be achieved through the following technical solutions:
The invention provides a kind of fan speed-regulating alarm system, wherein, comprise power module, backboard, alarm display module and multiple fan speed-regulating module;
Described power module is connected with described backboard and described alarm display module respectively, and described backboard is connected with described alarm display module by described multiple fan speed-regulating module;
Each described fan speed-regulating module includes and controls speed adjusting module, fan and guard sign reporting module;
Described fan is connected with described control speed adjusting module and described guard sign reporting module respectively, and described backboard is connected with described alarm display module by described control speed adjusting module, guard sign reporting module successively.
Above-mentioned fan speed-regulating alarm system, wherein, described power module comprises reference diode and current limliting quenching resistor, described power module provides-48v supply voltage for described backboard, and by described reference diode and described current limliting quenching resistor for described alarm display module provides-5v supply voltage.
Above-mentioned fan speed-regulating alarm system, wherein, described backboard is provided with ERNI connector, to provide constant low and high level to described fan speed-regulating module.
Above-mentioned fan speed-regulating alarm system, wherein, described control speed adjusting module comprises multiple control channel circuit and speed controller for fan, each described control channel all includes optocoupler, described low and high level to be modulated to the PWM waveform of multiple gear, and described speed controller for fan is utilized to control the rotating speed of the fan be connected with this control speed adjusting module.
Above-mentioned fan speed-regulating alarm system, wherein, described speed controller for fan is connected with described fan with PMOS triode by NPN triode successively.
Above-mentioned fan speed-regulating alarm system, wherein, described guard sign reporting module comprises optocoupler, and the alarm voltage of the fan be connected with this guard sign reporting module by described optocoupler collection, and export fan guard sign.
Above-mentioned fan speed-regulating alarm system, wherein, described alarm display module comprises logic gates and display unit, this logic gates is shown by described display unit after the fan guard sign that all guard sign reporting module be connected with described alarm display module export is carried out logical operation.
Above-mentioned fan speed-regulating alarm system, wherein, described logic gates is OR circuit.
Above-mentioned fan speed-regulating alarm system, wherein, described optocoupler is H11G1 chip.
In sum, a kind of fan speed-regulating alarm system of the present invention, by arranging reference diode and current limliting quenching resistor provides different negative supply voltages respectively to backboard and alarm display module in negative voltage power supply, utilize the control that multiple control channel of being connected with backboard respectively and speed controller for fan realize the many gears of fan speed simultaneously, to reduce redundancy, and adopt logic gates to carry out logical operation to fan warning information, and then guarantee that any one fan Shi Junhui that breaks down reports to the police, display, and the fan of alert device attendant to fault is safeguarded timely.
Accompanying drawing explanation
Fig. 1 is the structural representation of fan speed-regulating alarm system of the present invention;
Fig. 2 is the structural representation of fan speed-regulating alarm system fan speed adjusting module of the present invention;
Fig. 3 is the electrical block diagram of embodiment of the present invention dorsulum and power module;
Fig. 4 is the electrical block diagram controlling speed adjusting module in the embodiment of the present invention;
Fig. 5 is the electrical block diagram of guard sign reporting module in the embodiment of the present invention;
Fig. 6 is the electrical block diagram of embodiment of the present invention fan;
Fig. 7 is the electrical block diagram of logic gates in the embodiment of the present invention;
The PWM square-wave voltage table that when Fig. 8 is different gear in the embodiment of the present invention, fan receives.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described:
Fig. 1 is the structural representation of fan speed-regulating alarm system of the present invention and method; Fig. 2 is the structural representation of fan speed-regulating alarm system of the present invention and method fan speed adjusting module.
As shown in Figure 1, a kind of fan speed-regulating alarm system, comprises power module, backboard, alarm display module and multiple fan speed-regulating module; Power module is connected with backboard and alarm display module respectively, and backboard is connected with alarm display module by multiple fan speed-regulating module.
As shown in Figure 2, each fan speed-regulating module includes and controls speed adjusting module, fan and guard sign reporting module, and fan is connected with control speed adjusting module and guard sign reporting module respectively; As shown in Figure 1-2, backboard is connected with alarm display module by control speed adjusting module, guard sign reporting module successively.
Further, power module comprises reference diode and current limliting quenching resistor; Power module for-48v is provided for backboard direct current power source voltage while, adopt the principle of low voltage control high pressure, by reference diode and current limliting quenching resistor ,-48v direct current power source voltage be modulated to-5v, to provide the DC electrical source of-5v to alarm display module; Like this, adopt the most frequently used step-down mode just can replace the supply voltage of alarm display module, and then greatly reduce process costs.
Wherein, backboard is provided with ERNI connector as ERN1384854 etc., to supply constant low and high level to fan speed adjusting module, i.e. output digit signals.
Further, control speed adjusting module and comprise multiple control channel and speed controller for fan, be provided with optocoupler in this control channel each, this optocoupler mainly protects the damage that the bad meeting due to fan produces backboard and other equipment; By the adjustment of actuation voltage in the conducting of above-mentioned optocoupler and resistance, constant low and high level is modulated to the different continous-stable voltage of multistage, be analogue signal by digital signal modulated, as adopted three control channels, a h11g1 optocoupler is provided with in each control channel, then constant low and high level can be modulated to 8 sections of different continous-stable voltages by the adjustment of the upper actuation voltage of these three optocoupler conductings and corresponding resistor, and utilize speed controller for fan such as TC648B etc. to export PWM square wave, to control the rotating speed of the fan be connected with this control speed adjusting module; Wherein, speed controller for fan is connected with fan with PMOS triode such as SM1A16PSU etc. by NPN triode such as MMBT2222A etc. successively.
Further, guard sign reporting module comprises optocoupler as h11g1 etc., and passes through the alarm voltage of the fan that the collection of this optocoupler is connected with this guard sign reporting module, exports this fan guard sign after process.
Further, alarm display module comprise logic gates as or door etc. and display unit, this logic gates is shown by display unit after the fan guard sign that all guard sign reporting module be connected with alarm display module export is carried out logical operation.
Concrete, ERNI backboard provides-48V supply voltage by power module, to produce constant low and high level; Multiple fan speed-regulating module receives low and high level, and respectively by optocoupler conducting and the upper actuation voltage of corresponding resistor low and high level is modulated, and pass through and speed controller for fan output PWM square wave, control to utilize the rotating speed of this PWM square wave to the fan that this fan speed-regulating module comprises; Guard sign reporting module carries out the collection of fan alarm voltage by its optocoupler comprised, and exports this fan guard sign; Alarm display module carries out logical operation by the logic gates contained by it to the fan guard sign that connected all guard sign reporting module export, and is reported to the police by display unit; Wherein, power module by its reference diode comprised and current limliting quenching resistor for display unit provides the supply voltage of-5v.
Embodiment:
For be connected with backboard three fans, the present invention is illustrated below, and three control channels are adopted in each control speed adjusting module, and be provided with optocoupler h11g1 in each control channel, to carry out the signal madulation of 8 gears, employing model is the fan speed controller output PWM square wave of TC648B simultaneously, to carry out speeds control to fan, specific as follows:
Fig. 3 is the electrical block diagram of embodiment of the present invention dorsulum and power module, Fig. 4 is the electrical block diagram controlling speed adjusting module in the embodiment of the present invention, Fig. 5 is the electrical block diagram of guard sign reporting module in the embodiment of the present invention, Fig. 6 is the electrical block diagram of embodiment of the present invention fan, Fig. 7 is the electrical block diagram of logic gates in the embodiment of the present invention, the PWM square-wave voltage table that when Fig. 8 is different gear in the embodiment of the present invention, fan receives.
As shown in Figure 3, a kind of fan speed-regulating alarm system of the present invention, comprise the connector that model is ERN1384854, the equal ground connection of pin 17-20,30-32 of this connector, pin 21 is connected the resistance R105 ground connection of 1k Ω, and the control speed adjusting module that pin 6-8 is connected with fan FAN3 connects, and the control speed adjusting module that pin 10-12 is connected with fan FAN2 connects, the control speed adjusting module that pin 14-16 is connected with fan FAN1 connects, and pin 1,2 connects; Also comprise power supply FAN-48v, this power supply is connected with D1 and D2 with chip LP60-110 respectively by the inductance L 1 of 15uH successively, and the other end of D1 is connected with the pin 1,2 of connector, the other end of D2 is connected with the pin 3 of connector, to provide the supply voltage of-48v to connector; Power supply FAN-48v is also by the electric capacity C4 ground connection of electric capacity C3 and 0.1uF of 47uF/100v in parallel; Power supply FAN-48v is also connected by the R3 of resistance R5-R9 in parallel to be the R2 of 1k Ω and resistance respectively with the C2 of electric capacity C1,47uF/16v of D3,0.1uF of 1N4733, resistance be 1k Ω, and be connected with the ACT-n pin of power supply indicator XP6 after R2 with R3 series connection, the ACT-p pin ground connection of power supply indicator XP6, the equal ground connection of the other end of D3, C1 and C2; Namely the principle of low voltage control high pressure is adopted, the supply voltage of-48v is modulated to-5v (with the negative pole end of C2 be connected below all referred to as-5v power supply) by reference diode (D3) IN4733 at the negative pole end of C2, R5-R9 is as current limliting quenching resistor simultaneously, so just the most basic step-down mode can be adopted to replace the power supply of alarm display module, while stable-5v DC electrical source power supply is provided for follow-up alarm display module, reduce process costs.
Because the control connection circuit of three fans is all identical, below be just described with fan FAN1, the circuit connecting relation of all the other two fans FAN2, FAN3 is with reference to fan FAN1; As shown in Figure 4, in the control arrangements for speed regulation be connected with fan FAN1, the pin 1 of optocoupler U3, U4, U5 connect respectively 1k Ω R21,1k Ω R27 and 1k Ω R34 after, be connected with the pin 16,15 and 14 connecting machine respectively, pin 2 all ground connection of optocoupler U3, U4, U5, the pin 4 of optocoupler U3, U4, U5 is connected with-5v power supply respectively, and this-5v power supply is also connected with one end of R24, C5, C6, C7 and R30 respectively, and the e pole of NPN triode T1 is also all connected with this-5v power supply with the pin 4 (GND) of TC648B; The pin 5 of optocoupler U3, U4, U5 connect respectively 330k Ω R25,220k Ω R28 with 100k Ω R31 after be the speed controller for fan of TC648B with model pin 1 (Vin) is connected, the pin 5 of optocoupler U3, U4, U5 resistance of also connecting respectively is ground connection after R22, R29 and R35 of 10k Ω.
Model is that the pin 1 (Vin) of the speed controller for fan of TC648B is also connected with the other end of the C5 of 0.1uF respectively, and passes through the R23 ground connection of R26,47k Ω of the 24k Ω of series connection, and the other end of the R24 of 24k Ω is connected with ungrounded one end of R23; The pin 2 (CF) of TC648B is connected with the other end of the C6 of 1uF; The pin 3 (VAS) of TC648B is by the R33 ground connection of 51k Ω, and the other end of the R30 of C7 with the 18k Ω of 0.1uF is all connected with the ungrounded end of R33; Pin 8 (VDD) ground connection of TC648B, the b pole that pin 7 (VOUT) is the NPN triode T1 of MMBT2222A by the R32 of 10k Ω and model is connected, the g pole that the R38 ground connection of c pole respectively by 24k Ω of T1, the R36 by 24k Ω are the PMOS T2 of SMIA16PSU with model is connected, the substrate of T2 and s be ground connection extremely all, and the d pole of T2 is connected with the pin 1 (FAN1-p) of FAN1 (XP2).
The signal that master control sends fan board to by connector XP1 is digital signal (constant low and high level), and is adjusted to 8 sections of different continous-stable voltages (analogue signal) by the conduction and cut-off of optocoupler U3, U4, U5 and the upper actuation voltage of resistance R22//R25, R28//R29 and R31//R35; Due to the difference of the input voltage of TC648B, dutycycle (the ratio of high level 1 and low level 0 of its PWM square wave (voltage magnitude is identical) exported, the i.e. time scale of the Push And Release of fan FAN1) different, and the shutoff of this Duty ratio control PMOS, because the frequency turned off is higher, alminium electrolytic condenser C8 can carry out discharge and recharge when fan closes/disconnects, and then by PWM square wave level and smooth (now the amplitude of square wave is 48V), cause the voltage effective value that the positive and negative two ends of fan are different, to control the rotating speed of fan FAN1.
As illustrated in figs. 5-7, model is that the pin 5 of the optocoupler U6 of h11g1 is connected by the pin 27 of R37 and the ERN1384854 of 1k Ω, pin 6 ground connection, the pin 2 of optocoupler U6 are connected with-48v power supply FAN-48v, pin 1 is connected with one end of R40, R41, C9 respectively, and the pin 1 of coupling U6 is also connected with the c pole of T3; Resistance is the equal ground connection of the other end of R40 and R41 of 24k Ω, and the other end of the C9 of 0.1uF is connected with power supply FAN-48v; This power supply FAN-48v is also connected with the e pole of T3 and one end of R42, C10, C8 respectively, the other end (+pole) of the C8 of 22uF, 100v is connected with the d pole of T2, and the other end (+pole) of the C10 of 47uF, 16v is by the pin 2 (FAN1-`3 of R39 and the FAN1 (XP2) of 24k Ω
rd) connect, the pin 2 of FAN1 (XP2) is also respectively by R43 and the R106 ground connection of parallel connection; Model is that the b pole of the T3 of MMBT2222A is connected with the other end of the R42 of 10k Ω respectively by the R44 of 1k Ω, is connected with one end of the R45 of 3k Ω and the R46 of 100 Ω, the other end and the model of R45 are that the pin 1 of the U7 of h11g1 is connected, the other end and the model of R46 are that the pin 2 of the U7 of h11g1 is connected, and the pin 1 of U7 is also connected with the positive pole of C10, the pin 2 (FAN-A1-display) that pin 5 ground connection of U7, pin 4 are the U1 of NC7SZ32PX5 by the R48 of 1k Ω and model is connected, and the pin 2 of U1 is also connected with-5v power supply by the R47 of 3k Ω.
Fig. 6 fan FAN1 (XP2), fan FAN2 (XP3) are all connected with FAN-48v power supply with the pin 3 of fan FAN3 (XP4), the pin 1 (FAN2-p) of fan FAN2 (XP3) and pin 2 (FAN2-3
rd) and the pin 1 (FAN3-p) of fan FAN3 (XP4) and pin 2 (FAN3-3
rd) all with reference to pin 1 (FAN1-p) and the pin 2 (FAN1-3 of fan FAN1 (XP2)
rd) circuit structure is set, be not repeated at this; Wherein, draw in the circuit of guard sign output line FAN-A2-display and fan FAN3 (XP4) in the circuit of fan FAN2 (XP3) and draw guard sign output line FAN-A3-display.
In Fig. 7, the pin 1 of U1 is connected with guard sign output line FAN-A2-display, pin 5 ground connection, and pin 3 is connected with-5v power supply, and exports FAN-A1A2-display by pin 4.Model is that the pin 1 of the logic sum gate U2 of NC7SZ32PX5 is connected with the pin 4 of U1, the pin 2 of U2 is connected with guard sign output line FAN-A3-display, pin 5 ground connection, pin 3 is connected with-5v power supply, and pin 4 is connected with the pin 2 (ALM-p) of ALM (XP5), and the pin 1 (ALM-n) of ALM (XP5) is connected with-5v power supply by the R4 of 330 Ω.
Concrete, see Fig. 3-8, control speed adjusting module and receive 3 road low and high level control commands from backboard XP1, to control conducting or the cut-off of optocoupler U1, U2 and U3, and then determine that the level of each circuit (circuit of R25, R28 and R31) is pull-up or drop-down, as shown in the table in fig, 3 tunnel control signals adjustable go out 8 kinds of input voltages, thus also just have 8 kinds of dutycycles exporting square wave, realize the setting of the speed stage of 8 fans like this; Corresponding, the input voltage of the corresponding TC648B of each gear, exports corresponding PWM square wave, namely according to equipment operating environment, draws temperature profile, and then selects suitable wind-speed gear and fan number; Changed the input voltage of fan speed control chip TC648B by the speed governing gear arranged, this chip TC648B exports the square wave of distinct pulse widths, to change the switching speed of NPN triode T1 and P-MOS pipe T2 thereof; Wherein, the relation of control signal number S and gear N is: N=2
s.
The conducting of T2, makes the positive pole FAN1_p of fan FAN1 be high level ground (negative pole-48V of relative fan FAN1); And T2 by time, then in high-impedance state, now, the two poles of the earth no-voltage of fan FAN1, fan stops, but has alminium electrolytic condenser C8 to do buffered due to two interpolars of fan FAN1, so after fan FAN1 can slowly slow down, could stop, and the switching speed of P-MOS pipe T2 can change the speed (rotating speed) of fan FAN1.
Circuit theory: be the size of Vin (input voltage of chip TC648B pin 1) of oppositely being derived by required rotation speed of the fan dutycycle DC (DutyCircle) in theory, arrange with the resistance of resistance R25, R28, R31, resistance is conventional value and selects nearby herein, and Vas is the voltage of chip TC648B pin 3;
Vin＝-5.0+[DC×1.4V]+1.20V
Vin[100％]＝-2.40V
Vin[0％]＝-3.80V
Vas=-3.7V, if Vin<Vas, then TC648B does not start;
Wherein, Vin is calculated by the algorithm of kirchhoff node voltage.
If FAN1_C1 is high level (3.3V), like this with regard to U3 conducting, and R25 and R22 place node voltage is just pulled down to-4.7V (owing to there being the triode pressure drop of 0.3V, so be not-5V); All the other two fan FAN2 are all identical with FAN1 with FAN3 circuit characteristic, are not repeated at this.
In addition, in guard sign reporting module, adopt 3 line fan FAN1, FAN2 and FAN3 of 120*120*25mm48V, except both positive and negative polarity, tripod is alarm control pin; Wherein, see fan FAN1, the upper pull-up voltage of its tripod is with reference to fan negative pole, i.e.-48V, be conducive to the reading of guard sign and the display of panel leds (alarm display module), and adopt optocoupler U6, U7 to read alarm voltage, or door U1, U2 merge multichannel fan signal.
When fan FAN1 is normal, the output pressure drop of the tripod of fan FAN1 is 0V (negative pole-48V of relative fan FAN1), T3 not conducting, and 1,2 pin of U6 are conducting, (output voltage of master control CPLD) high voltage of FAN_A1 is drop-down, and master control is read and responded.
When fan FAN1 breaks down, the tripod of fan FAN1 can send a 48V high level (negative pole-48V of relative fan FAN1), and pulse enters LOCKED state.Use the segmentation dividing potential drop (R43 and R106 of R39, R45, R42 and parallel connection) of resistance, according to dividing ratios, R42 both end voltage 6V, T3 conducting, between 1,2 pin of U6, pressure drop is 0.3V, not conducting.(output voltage of master control CPLD) high voltage of FAN_A1 is constant, and master control is read and given a response, and then completes the alarm function of fan.
Wherein, in alarm display module, the alarm status of fan FAN1, FAN2 and FAN3 is reported comprehensive by employing or door U1, U2, realizes the effect that panel tutorial light (XP5) shows.
Below for fan FAN1, when fan is abnormal, the pressure drop of R45 is got at the two ends of 1,2 pin of U7.U7 conducting, FAN_A1_display gets R47, R48 dividing potential drop gained high level-1.25V (relative to-5V), and process or door U1, U2 output voltage realize the instruction of stand by lamp XP5; When fan is normal, the voltage of FAN_A1_display is low level-5V (relative to-5V), or door is without high level output, and XP5 does not work; Owing to adopting two or U1, U2 series connection, so arbitrary fan (FAN1, FAN2 and FAN3) is abnormal, XP5 all can alarm prompt.
In sum, a kind of fan speed-regulating alarm system of the present invention, by arranging reference diode and current limliting quenching resistor provides different negative supply voltages respectively to backboard and alarm display module in negative voltage power supply, utilize the control that multiple control channel of being connected with backboard respectively and speed controller for fan realize the many gears of fan speed simultaneously, to reduce redundancy, and adopt logic gates to carry out logical operation to fan warning information, and then guarantee that any one fan Shi Junhui that breaks down reports to the police, display, and the fan of alert device attendant to fault is safeguarded timely.
By illustrating and accompanying drawing, giving the exemplary embodiments of the specified structure of embodiment, based on the present invention's spirit, also can do other conversion.Although foregoing invention proposes existing preferred embodiment, but these contents are not as limitation.
For a person skilled in the art, after reading above-mentioned explanation, various changes and modifications undoubtedly will be apparent.Therefore, appending claims should regard the whole change and correction of containing true intention of the present invention and scope as.In Claims scope, the scope of any and all equivalences and content, all should think and still belong to the intent and scope of the invention.
Claims (7)
1. a fan speed-regulating alarm system, is characterized in that, comprises power module, backboard, alarm display module and multiple fan speed-regulating module;
Described power module is connected with described backboard and described alarm display module respectively, and described backboard is connected with described alarm display module by described multiple fan speed-regulating modules in parallel;
Each described fan speed-regulating module includes and controls speed adjusting module, fan and guard sign reporting module;
Described fan is connected with described control speed adjusting module and described guard sign reporting module respectively, and described backboard is connected with described alarm display module by described control speed adjusting module, guard sign reporting module successively;
Wherein, described control speed adjusting module comprises multiple control channel and speed controller for fan, and be provided with optocoupler in this control channel each, constant low and high level is modulated to the different continous-stable voltage of multistage, to control the rotating speed of the fan be connected with this control speed adjusting module by the adjustment of actuation voltage in the conducting of described optocoupler and resistance.
2. fan speed-regulating alarm system according to claim 1, it is characterized in that, described power module comprises reference diode and current limliting quenching resistor, described power module provides-48v supply voltage for described backboard, and by described reference diode and described current limliting quenching resistor for described alarm display module provides-5v supply voltage.
3. fan speed-regulating alarm system according to claim 1, is characterized in that, described backboard is provided with ERNI connector, to provide constant low and high level to described fan speed-regulating module.
4. fan speed-regulating alarm system according to claim 1, is characterized in that, described speed controller for fan is connected with described fan with PMOS triode by NPN triode successively.
5. fan speed-regulating alarm system according to claim 1, is characterized in that, described guard sign reporting module comprises optocoupler, and the alarm voltage of the fan be connected with this guard sign reporting module by described optocoupler collection, and export fan guard sign.
6. fan speed-regulating alarm system according to claim 5, it is characterized in that, described alarm display module comprises logic gates and display unit, this logic gates is shown by described display unit after the fan guard sign that all guard sign reporting module be connected with described alarm display module export is carried out logical operation.
7. fan speed-regulating alarm system according to claim 6, is characterized in that, described logic gates is OR circuit.
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| CN104154023A (en) * | 2014-08-18 | 2014-11-19 | 深圳市杰和科技发展有限公司 | Intelligent control system and method for multiple fans of display card |
| CN105226818B (en) * | 2015-10-08 | 2018-07-17 | 许继集团有限公司 | A kind of DC control protecting platform cabinet monitoring control device |
| CN218509764U (en) * | 2022-09-14 | 2023-02-21 | 北京比特大陆科技有限公司 | Fan detection system |
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| CN1913334A (en) * | 2005-08-09 | 2007-02-14 | 中兴通讯股份有限公司 | Speed regulating fan system with fault-tolerant capacity |
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| CN101435844A (en) * | 2008-11-14 | 2009-05-20 | 艾默生网络能源有限公司 | Fan failure detection circuit and detection method thereof |
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