CN201908860U - Direct-current circuit capable of regulating fan speed and detecting fault - Google Patents
Direct-current circuit capable of regulating fan speed and detecting fault Download PDFInfo
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- CN201908860U CN201908860U CN2010206844858U CN201020684485U CN201908860U CN 201908860 U CN201908860 U CN 201908860U CN 2010206844858 U CN2010206844858 U CN 2010206844858U CN 201020684485 U CN201020684485 U CN 201020684485U CN 201908860 U CN201908860 U CN 201908860U
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- fan speed
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- fan
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Abstract
The utility model discloses a direct-current circuit capable of regulating fan speed and detecting fault. The circuit comprises a negative temperature coefficient resistance temperature probe R1, resistors R2-R9, Rs, a electricity capacitor C1-C3, a 393 operation comparator U1A, a MOSFET element Q1 and an optical couple U2. Q1 is the MOSFET of the N channel. C1 is a polyphenyl ethyl propyl capacitor or a polycarbonate capacitor. The direct-current circuit employs functions of the comparator and characteristics of NTC (Negative Temperature Coefficient), and is a PWM (Pulse Width Modulation) output circuit capable of automatically regulating the oscillation frequency and the duty cycle based on temperature change. The direct-current circuit has output signals of fan fault and is simple and reliable; and the method is novel and the cost is low.
Description
Technical field
The utility model relates to power supply heat sinking control technique field, particularly relates to a kind of DC fan speed governing and fault monitoring circuit.
Background technique
UPS adopts the fan heat radiation mostly, the noise of fan operation when working for reducing UPS, usually reduce fan running speed, the general high low signal that adopts the detecting load capacity, deliver to DSP digital signal processor (DSP/MCU) and carry out analog-to-digital conversion (ADC), send the pwm signal drive fan by DSP digital signal processor again, realize the speed regulating control to fan, control is complicated.
Perhaps, adopt the speed regulating control of speed governing nonshared control unit realization, the cost height to fan.
The model utility content
The purpose of this utility model be to avoid of the prior art at aspects such as control or costs deficiency and a kind of DC fan speed governing and fault monitoring circuit are provided.
The purpose of this utility model realizes by following technical measures.
A kind of DC fan speed governing and fault monitoring circuit comprise negative temperature coefficient resister temperature transducer R1, resistance R 2-R9, Rs, capacitor C 1-C3,393 comparator U1A, N-channel MOS FET element Q1 and light lotus root U2; R1 one termination VCC, another termination C3, R2, the end of R4 and the normal phase input end of U1A, the other end ground connection of C3 and R2, the output terminal of another termination U1A of R4, R3, the end of R5 and R6, the end ground connection of C1, the other end of another termination R3 and the inverting input of U1A, another termination VCC of R5, the end of another termination R7 of R6, the grid of Q1, the other end ground connection of R7, the source class of Q1 connects the end of Rs, the end of R8, the drain electrode wind-receiving fan control end of Q1, the other end ground connection of Rs, the end of another termination C2 of R8 and 1 pin of U2, the other end ground connection of C2, the 2 pin ground connection of U2,3 pin of U2 connect the end of R9, the 4 pin connection circuit voltage reference points GND of U2, another termination VDD of R9.
Q1 is the MOSFET of N raceway groove.
C1 is thin-film capacitors such as polyphenyl second third rare electric capacity or polycarbonate (PC).
R1 is the NTC thermistor of negative temperature coefficient.
The utility model utilizes the function of comparator and the characteristic of NTC negative temperature coefficient, be a kind of according to temperature variation the PWM output circuit of self-control oscillation frequency and dutycycle, and band fan failure output signal, circuit is simple and reliable, method novelty, cost are very low.
Description of drawings
Utilize accompanying drawing that the utility model is described further, but the content in the accompanying drawing does not constitute any restriction of the present utility model.
Fig. 1 is an an embodiment's of the present utility model circuit diagram.
Embodiment
The utility model is described in further detail with the following Examples.
An embodiment of the present utility model as shown in Figure 1,
R1(NTC) be the thermistor of negative temperature coefficient, U1 is 393 common comparators, and VCC is certain power supply on the plate, and that the driving of fan is adopted is the MOSFET of N raceway groove, and PWM is adopted in control, so power consumption is very low, but the element of TO-92 or SOT encapsulation.
After the dividing potential drop of VCC through R1 and R, form the in-phase input end that reference voltage V b+ delivers to comparator, wherein:
Vb+=VCC*R2/(R1+R2)
Because R1 is the temperature variant thermistor of resistance, so the Vb+ reference potential of getting also varies with temperature and changes.R3 and C1 form negative-feedback circuit, and the voltage of integration is delivered to comparator end of oppisite phase Vb-, and the effect of R4 is as relatively sluggish.During original state, the voltage of capacitor C 1 can not suddenly change, Vb+ is higher than Vb-, and comparator output high level gives capacitor C 1 charging by R3 resistance simultaneously, when C1 charges to when being higher than Vb+, the comparator output switching activity is a low level, and resistance R 4 is pulled low to V+=VCC*(R2//R4 with Vb+ voltage)/(R1+R2//R4), this moment, capacitor C 1 was discharged by R3, when Vb-voltage is lower than V+, overturn and be high level in comparator output side.Electric capacity is charged to Vb+ needed time t1 from 0V:
t1=r1*ln｛VCC?/?(VCC-?Vb+)｝ r1=R3C1
Electric capacity is from the anti-electricity of Vb+ to V+ needed time t2:
t2=r1*lnVb+/V+
Output PWM period T=t1+t2; Dutycycle D=t1/ t1+t2
Because along with variation of temperature raises, Vb+ is in continuous rising, so the t1 value is also increasing, the PWM frequency constantly raises, the increase that dutycycle D is directly proportional with temperature, thereby the speed regulating control of realization fan.Utilize the characteristics of comparator OC output, be used to provide the pull-up resistor power supply VCC of the power supply of benchmark dividing potential drop and comparator can be different in the circuit, the pwm pulse of output can mate interface circuits such as TTL, CMOS, realizes the multiple application of different occasions.The selection temperature stability of capacitor C 1 is good, medium absorbs low polyphenyl the second third rare or polycarbonate (PC) electric capacity.
Element such as Rs and U2 is formed is the fan failure detection, at the small resistor value Rs of fan grounding end as current sense resistance, during the fan proper functioning, on Rs, form a series of pulses, after light-coupled isolation, also produce a series of pulses, if fan breaks down at the optocoupler output terminal, there is not electric current to flow through on the Rs, optocoupler output is high level always, can judge fan failure by other peripheral circuits, avoids adopting the three-way expensive fan of tape jam signal output.
Should be noted that at last; above embodiment only is used to the technical solution of the utility model is described but not to the restriction of the utility model protection domain; although the utility model has been done detailed description with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the essence and the scope of technical solutions of the utility model.
Claims (4)
1. DC fan speed governing and fault monitoring circuit is characterized in that: comprise negative temperature coefficient resister temperature transducer R1, resistance R 2-R9, Rs, capacitor C 1-C3,393 comparator U1A, N-channel MOS FET element Q1 and light lotus root U2; R1 one termination VCC, another termination C3, R2, the end of R4 and the normal phase input end of U1A, the other end ground connection of C3 and R2, the output terminal of another termination U1A of R4, R3, the end of R5 and R6, the end ground connection of C1, the other end of another termination R3 and the inverting input of U1A, another termination VCC of R5, the end of another termination R7 of R6, the grid of Q1, the other end ground connection of R7, the source class of Q1 connects the end of Rs, the end of R8, the drain electrode wind-receiving fan control end of Q1, the other end ground connection of Rs, the end of another termination C2 of R8 and 1 pin of U2, the other end ground connection of C2, the 2 pin ground connection of U2,3 pin of U2 connect the end of R9, the 4 pin connection circuit voltage reference points GND of U2, another termination VDD of R9.
2. DC fan speed governing according to claim 1 and fault monitoring circuit is characterized in that: Q1 is the MOSFET of N raceway groove.
3. DC fan speed governing according to claim 1 and fault monitoring circuit is characterized in that: C1 is thin-film capacitors such as polyphenyl second third rare electric capacity or polycarbonate (PC).
4. DC fan speed governing according to claim 1 and fault monitoring circuit is characterized in that: R1 is the NTC thermistor of negative temperature coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206844858U CN201908860U (en) | 2010-12-28 | 2010-12-28 | Direct-current circuit capable of regulating fan speed and detecting fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206844858U CN201908860U (en) | 2010-12-28 | 2010-12-28 | Direct-current circuit capable of regulating fan speed and detecting fault |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201908860U true CN201908860U (en) | 2011-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206844858U Expired - Lifetime CN201908860U (en) | 2010-12-28 | 2010-12-28 | Direct-current circuit capable of regulating fan speed and detecting fault |
Country Status (1)
| Country | Link |
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| CN (1) | CN201908860U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003400A (en) * | 2010-12-28 | 2011-04-06 | 易事特电力系统技术有限公司 | Direct current fan speed regulation and fault sensing circuit |
| CN102645290A (en) * | 2012-04-28 | 2012-08-22 | 浪潮电子信息产业股份有限公司 | Processing method aiming at system temperature sensor fault based on server |
-
2010
- 2010-12-28 CN CN2010206844858U patent/CN201908860U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003400A (en) * | 2010-12-28 | 2011-04-06 | 易事特电力系统技术有限公司 | Direct current fan speed regulation and fault sensing circuit |
| CN102003400B (en) * | 2010-12-28 | 2013-01-30 | 易事特电力系统技术有限公司 | Direct current fan speed regulation and fault sensing circuit |
| CN102645290A (en) * | 2012-04-28 | 2012-08-22 | 浪潮电子信息产业股份有限公司 | Processing method aiming at system temperature sensor fault based on server |
| CN102645290B (en) * | 2012-04-28 | 2015-08-26 | 浪潮电子信息产业股份有限公司 | A kind of disposal route for system temperature sensor fault based on server |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110727 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |