CN102003400A - Direct current fan speed regulation and fault sensing circuit - Google Patents
Direct current fan speed regulation and fault sensing circuit Download PDFInfo
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- CN102003400A CN102003400A CN2010106090111A CN201010609011A CN102003400A CN 102003400 A CN102003400 A CN 102003400A CN 2010106090111 A CN2010106090111 A CN 2010106090111A CN 201010609011 A CN201010609011 A CN 201010609011A CN 102003400 A CN102003400 A CN 102003400A
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Abstract
The invention discloses a direct current fan speed regulation and fault sensing circuit, which comprises a negative temperature coefficient resistance temperature sensor R1, resistors R2-R9 and Rs, capacitors C1-C3, a 393 operation calculator U1A, an MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor) element Q1 and an optical coupler U2, wherein Q1 is the MOSFET with an N-type channel, and C1 is a polyphenyl ethylene-propylene capacitor or a polycarbonate capacitor. By utilizing the function of the comparator and the characteristic of a negative temperature coefficient (NTC), the direct current fan speed regulation and fault sensing circuit is a PWM (Pulse-Width Modulation) output circuit which has self-adjustability of vibration frequency and duty cycle according to the change of the temperature and is provided with a fan fault output signal, thereby the circuit is simple and reliable, and the method is novel and is low in cost.
Description
Technical field
The present invention relates to power supply heat sinking control technique field, particularly relate 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.
Summary of the invention
The objective of the invention is 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.
Purpose of the present invention 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 present invention 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, the method novelty, cost is very low.
Description of drawings
The present invention will be further described to utilize accompanying drawing, but the content in the accompanying drawing does not constitute any limitation of the invention.
Fig. 1 is the circuit diagram of one embodiment of the present of invention.
Embodiment
The invention will be further described with the following Examples.
One embodiment of the present of invention 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 illustrate technological scheme of the present invention but not limiting the scope of the invention; although the present invention 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 technological scheme of the present invention, and not break away from the essence and the scope of technical solution of the present invention.
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 |
|---|---|---|---|
| CN 201010609011 CN102003400B (en) | 2010-12-28 | 2010-12-28 | Direct current fan speed regulation and fault sensing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010609011 CN102003400B (en) | 2010-12-28 | 2010-12-28 | Direct current fan speed regulation and fault sensing circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN102003400A true CN102003400A (en) | 2011-04-06 |
| CN102003400B CN102003400B (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010609011 Active CN102003400B (en) | 2010-12-28 | 2010-12-28 | Direct current fan speed regulation and fault sensing circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102852843A (en) * | 2012-08-31 | 2013-01-02 | 北京机械设备研究所 | Temperature-controlled speed-regulating circuit for direct-current fan |
| CN104821761A (en) * | 2014-02-04 | 2015-08-05 | 发那科株式会社 | Electronic apparatus with fan motor |
| CN107420337A (en) * | 2017-07-24 | 2017-12-01 | 温州长江汽车电子有限公司 | A kind of control circuit of blower with diagnostic function |
| CN107843279A (en) * | 2017-11-02 | 2018-03-27 | 宁波中车时代传感技术有限公司 | A kind of sensor circuit with Autonomous test failure and self-regulating function |
| CN107859647A (en) * | 2017-10-27 | 2018-03-30 | 依必安派特风机(上海)有限公司 | A kind of frequency-adjustable speed-adjustable interface circuit, blower fan, fan speed regulation system and speed regulating method |
| CN109236697A (en) * | 2018-10-29 | 2019-01-18 | 安徽四创电子股份有限公司 | A kind of blower fan control system |
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| JP2009303287A (en) * | 2008-06-10 | 2009-12-24 | Nidec Shibaura Corp | Motor controller |
| CN201908860U (en) * | 2010-12-28 | 2011-07-27 | 易事特电力系统技术有限公司 | Direct-current circuit capable of regulating fan speed and detecting fault |
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| CN101320952A (en) * | 2005-08-11 | 2008-12-10 | 台达电子工业股份有限公司 | Driving device of fan motor |
| CN101233676A (en) * | 2005-08-26 | 2008-07-30 | 罗姆股份有限公司 | Motor driven unit, motor drive method and cooling apparatus using the unit |
| US20080238359A1 (en) * | 2007-03-26 | 2008-10-02 | The Gillette Company | Lithium Iron Phosphate Ultra Fast Battery Charger |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102852843A (en) * | 2012-08-31 | 2013-01-02 | 北京机械设备研究所 | Temperature-controlled speed-regulating circuit for direct-current fan |
| CN102852843B (en) * | 2012-08-31 | 2014-10-08 | 北京机械设备研究所 | Temperature-controlled speed-regulating circuit for direct-current fan |
| CN104821761A (en) * | 2014-02-04 | 2015-08-05 | 发那科株式会社 | Electronic apparatus with fan motor |
| CN104821761B (en) * | 2014-02-04 | 2017-11-03 | 发那科株式会社 | Possesses the electronic equipment of fan motor |
| CN107420337A (en) * | 2017-07-24 | 2017-12-01 | 温州长江汽车电子有限公司 | A kind of control circuit of blower with diagnostic function |
| CN107859647A (en) * | 2017-10-27 | 2018-03-30 | 依必安派特风机(上海)有限公司 | A kind of frequency-adjustable speed-adjustable interface circuit, blower fan, fan speed regulation system and speed regulating method |
| CN107859647B (en) * | 2017-10-27 | 2020-01-10 | 依必安派特风机(上海)有限公司 | Frequency modulation speed regulation interface circuit, fan speed regulation system and speed regulation method |
| CN107843279A (en) * | 2017-11-02 | 2018-03-27 | 宁波中车时代传感技术有限公司 | A kind of sensor circuit with Autonomous test failure and self-regulating function |
| CN107843279B (en) * | 2017-11-02 | 2020-09-25 | 宁波中车时代传感技术有限公司 | Sensor circuit with self-detection fault and self-regulation functions |
| CN109236697A (en) * | 2018-10-29 | 2019-01-18 | 安徽四创电子股份有限公司 | A kind of blower fan control system |
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| Publication number | Publication date |
|---|---|
| CN102003400B (en) | 2013-01-30 |
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Effective date of registration: 20180529 Address after: 030000 Shui Xiu Industrial Park, Shui Xiu Township, Taigu County, Jinzhong, Shanxi Patentee after: Shanxi Jinlu EAST new energy Co., Ltd. Address before: 523808 EAST Power System Technology Co., Ltd. 6, industrial North Road, Songshan Lake Science and Technology Industrial Park, Dongguan, Guangdong Patentee before: East Electric System Technology Co., Ltd. |
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Effective date of registration: 20180815 Address after: 523000 No. 6 industrial North Road, Songshan Lake Science and Technology Industrial Park, Dongguan, Guangdong Patentee after: EAST GROUP CO., LTD. Address before: 030000 Shui Xiu Industrial Park, Shui Xiu Township, Taigu County, Jinzhong, Shanxi Patentee before: Shanxi Jinlu EAST new energy Co., Ltd. |
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