WO1992022863A1 - Dispositif de regulation de ventilateur de refroidissement - Google Patents

Dispositif de regulation de ventilateur de refroidissement Download PDF

Info

Publication number
WO1992022863A1
WO1992022863A1 PCT/SE1992/000414 SE9200414W WO9222863A1 WO 1992022863 A1 WO1992022863 A1 WO 1992022863A1 SE 9200414 W SE9200414 W SE 9200414W WO 9222863 A1 WO9222863 A1 WO 9222863A1
Authority
WO
WIPO (PCT)
Prior art keywords
fan
control circuit
voltage
circuit
intended
Prior art date
Application number
PCT/SE1992/000414
Other languages
English (en)
Inventor
Urban Eriksson
Original Assignee
Urban Eriksson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Urban Eriksson filed Critical Urban Eriksson
Publication of WO1992022863A1 publication Critical patent/WO1992022863A1/fr

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device

Definitions

  • the present invention relates to a control arrangement for personal computer cooling fans.
  • the invention is primarily concerned with a control arrangement which can be subsequently fitted to existing personal computers.
  • Cooling fans are necessary in order to cool the electronic devices of the computer and to prevent these devices from becoming overheated, which may result in damage to the computer.
  • the majority of known personal computers are fitted with relatively powerful fans, so that the computer will be cooled even under conditions in which the ambient temperature is relatively high.
  • the internal temperature of the computer should not exceed approximately 50°C.
  • the fan will thus constantly create noise which although slight is felt to be extremely irritating by same people. This is amplified by the fact that the office space in which people work with personalcomputers is otherwise often relatively quiet.
  • Devices which include a temperature sensor and an electronic control circuit which is intended to control the fan voltage in response to temperature.
  • the device is intended to be fitted subsequently to existing personal computers.
  • the known device is encumbered with several decisive draw-backs.
  • One drawback is that the fan remains completely stationary at temperatures beneath 24°C and at a temperature of 24°C a low idling voltage is applied to the fan, which may mean that the motor and fan starting-torque is not reached until the temperature that prevails is considerably higher than 24°C, i.e. the temperature at which a higher voltage is applied to the motor.
  • Another drawback is that the device is not constructed so that its temperature sensing element is able to sense the mean temperature of the exhaust air from the computer. The working of the control circuit is, in fact, dependent on the position of the device in the computer.
  • the problem is solved by the present invention, which provides a highly reliable control device.
  • the present invention relates to a control device for trolling a pesonal computer cooling fan, said device including a temperature sensor and a control circuit which is intended to apply voltage to the fan in response to a signal from the temperature sensor, and is characterized by the combination that the control circuit is constructed to apply a higher voltage to the fan than its idling voltage for alimited predetermined period of time when the computer is switched on; in that the control device has a dimension of at most 4 ⁇ 3 cm and a thickness of at most 1 cm, thereby enabling the device to be placed in the fan housing; and in that there is provided between the control circuit and the sensor body of the temperatur sensor a rigid electric conductor having a length sufficient to enable the sensor body to be placed in the airflow through the fan.
  • FIG. 1 is a block schematic illustrating the inventive device
  • FIG. 2 is an example of a circuit diagram
  • FIG. 3 illustrates a personal computer fan seen from one side and fitted with a control device according to the invention.
  • FIG. 4 is a view of a personal computer fan seen immediately
  • FIGs 3 and 4 illustrate a control device 1 for controlling a personal computer cooling fan 2.
  • the control device 1 includes a temperature sensor 3 and a control circuit which is constructed to apply a voltage to the fan 2 in response to a signal received from the temperature sensor 3.
  • the sensor 3 is intended to be placed in the airflow constituting fan exhaust air 4, i.e. the air that the fan has withdrawn from the computer by suction.
  • the reference numeral 7 in Figures 3 and 4 identifies fan blades.
  • the inventive control device 1 has a dimension of at most about 4 ⁇ 3 cm and a thickness of at most about 1 cm, thereby enabling the device to be placed in the fan housing 5. Extending between the control circuit 1 and the temperature sensor body 6 is a rigid electric conductor 7' whose length is sufficient to enable the sensor body 6 to be placed in the flow of air passing through the fan 2.
  • control circuit 1 This is an essential feature of the invention, since it will enable the sensor body 6 of the temperature sensor to detect a mean temperature in the computer while, at the same time, rendering it unimportant as to where the control circuit 1 itself is located.
  • control circuit is constructed so that it can be placed in the fan housing 2, there is nothing to prevent the circuit from being placed in some other location, provided that the sensor body 6 can be placed in the airflow.
  • control circuit 1 when the personal computer concerned is switched on, the control circuit 1 will function to apply a higher voltage to the fan 2 than its idling voltage for a limited, predetermined period of time.
  • a starting circuit 10 belonging to the control circuit is provided to this end, see Figure 1.
  • the starting circuit 10 is constructed to activate or drive the fan 2 with full voltage, namely 12 V, over a period of about 2 to 10 seconds, preferably 4 seconds, when the computer is first switched on.
  • the device overcomes any starting difficulties that the fan may have in the form of starting torque in those instances when the fan is first started with an idling voltage of, for instance, 5 V.
  • the starting circuit when the personal computer is switched on, the starting circuit applies a voltage of 12 V to the fan 2. This voltage falls after a time lapse of 4 seconds. This is effected with the aid of a time circuit which includes an RC-circuit, see Figure 2, where the starting circuit includes those components shown within the broken line area 13.
  • a control circuit 11 included in the control circuit 1 is constructed to then activate the fan 2 in response to the signal from the temperature sensor 3. This control circuit begins to function when the starting circuit 10 has lowered the voltage to the fan.
  • control circuit 11 is constructed to activate or drive the fan in response to temperature, preferably in accordance with a linear relationship within a temperature range of about 25°C and 45°C, and to activate or drive the fan at full voltage at temperatures thereabove, i.e. at a voltage of about 12 V, and to activate the fan with a low idling voltage, for instance a voltage of about 5 V, at temperatures beneath 25°C. This is shown in Figure 1, where the idling voltage is set to 5.4 V.
  • the fan When the idling voltage is applied, the fan will rotate so slowly as not to be heard in practice. The fan is then regulated to work at the lowest necessary speed at which the personal computer is sufficiently cooled. This means that the sound generated is far less than is normal in present-day computers when the fan constantly operates at full power.
  • control circuit includes a separate safety circuit 12 which is intended to come into operation at a temperature of about 45°C and to immediately activate the fan with full voltage at a temperature above 47°C.
  • safety circuit preferably activates the fan linearly, as shown in Figure 1.
  • Figure 2 illustrates the components that are included in the safety circuit within the area referenced 14.
  • This circuit activates the fan irrespective of whether the control circuit 11 functions or not.
  • the safety circuit 12 is connected to a separate temperature sensor 3".
  • the temperature sensor for the control circuit is referenced 3'. Both of the temperature sensors 3' and 3" may be placed at the end of the aforesaid rigid conductor.
  • Figure 2 illustrates an exemplifying circuit in which NTC designates the temperature sensors and T1, T2 and T3 designate transistors.
  • the fan is referenced 2. In other respects, standard accepted symbols are used. The person skilled in this art will have no difficulty in dimensioning the components on the basis of the illustrated circuit in order to achieve desired control temperatures and times.
  • the inventive control circuit is coupled in series with the standard cables extending between voltage source and a fan which is already installed in a personal computer.

Abstract

Un dispositif de régulation de ventilateur de refroidissement d'ordinateur personnel comprend un détecteur de température et un circuit de régulation destiné à alimenter le ventilateur en une tension électrique, en réponse à un signal reçu du détecteur de température. L'invention est caractérisée par la combinaison du fait que le circuit de régulation (1) est destiné, lorsque l'ordinateur personnel concerné est allumé, à alimenter le ventilateur (2) en une tension plus grande que sa tension sans charge, pendant un temps limité, prédéterminé, et du fait que le dispositif de régulation (1) a des dimensions maximales d'environ 4 x 3 cm et une épaisseur maximale d'envrion 1 cm permettant au dispositif d'être placé dans le carter (5) du ventilateur (2); l'invention est aussi caractérisée par la présence, entre le circuit de régulation et le corps (6) du détecteur de température (3), d'un conducteur électrique rigide de longueur suffisante pour permettre au corps de détecteur (6) d'être placé dans le flux d'air traversant le ventilateur (2).
PCT/SE1992/000414 1991-06-13 1992-06-12 Dispositif de regulation de ventilateur de refroidissement WO1992022863A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101822A SE467475B (sv) 1991-06-13 1991-06-13 Styranordning foer en kylflaekt hos en persondator
SE9101822-6 1991-06-13

Publications (1)

Publication Number Publication Date
WO1992022863A1 true WO1992022863A1 (fr) 1992-12-23

Family

ID=20383030

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1992/000414 WO1992022863A1 (fr) 1991-06-13 1992-06-12 Dispositif de regulation de ventilateur de refroidissement

Country Status (2)

Country Link
SE (1) SE467475B (fr)
WO (1) WO1992022863A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0617355A1 (fr) * 1993-03-22 1994-09-28 Siemens Nixdorf Informationssysteme Aktiengesellschaft Régulation d'un ventilateur
US5526289A (en) * 1993-06-14 1996-06-11 Compaq Computer Corporation Temperature dependent fan control circuit for personal computer
EP1447710A1 (fr) * 2003-02-13 2004-08-18 Noritsu Koki Co., Ltd. Dispositif de réglage de la température pour source lumineuse à diodes électroluminescentes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1568507A (en) * 1976-10-15 1980-05-29 Colair Electronics Ltd Electric motor control units
EP0090514A1 (fr) * 1982-03-15 1983-10-05 Rotron Incorporated Ventilateur commandé au moyen de la vitesse d'un moteur à courant continu sensible à la température
US4806832A (en) * 1982-11-23 1989-02-21 Papst Motoren Kg Fan with temperature controlled rotation speed

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1568507A (en) * 1976-10-15 1980-05-29 Colair Electronics Ltd Electric motor control units
EP0090514A1 (fr) * 1982-03-15 1983-10-05 Rotron Incorporated Ventilateur commandé au moyen de la vitesse d'un moteur à courant continu sensible à la température
US4806832A (en) * 1982-11-23 1989-02-21 Papst Motoren Kg Fan with temperature controlled rotation speed

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0617355A1 (fr) * 1993-03-22 1994-09-28 Siemens Nixdorf Informationssysteme Aktiengesellschaft Régulation d'un ventilateur
US5526289A (en) * 1993-06-14 1996-06-11 Compaq Computer Corporation Temperature dependent fan control circuit for personal computer
US5574667A (en) * 1993-06-14 1996-11-12 Compaq Computer Corporation Temperature independent fan-error correction circuit
EP1447710A1 (fr) * 2003-02-13 2004-08-18 Noritsu Koki Co., Ltd. Dispositif de réglage de la température pour source lumineuse à diodes électroluminescentes
US7438439B2 (en) 2003-02-13 2008-10-21 Noritsu Koki Co., Ltd. Temperature adjusting device for an LED light source

Also Published As

Publication number Publication date
SE9101822L (sv) 1992-07-20
SE467475B (sv) 1992-07-20
SE9101822D0 (sv) 1991-06-13

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