WO1991012572A1 - Remote controlled interface adapter for temperature control comprising safeguarding circuit - Google Patents

Remote controlled interface adapter for temperature control comprising safeguarding circuit Download PDF

Info

Publication number
WO1991012572A1
WO1991012572A1 PCT/DK1991/000037 DK9100037W WO9112572A1 WO 1991012572 A1 WO1991012572 A1 WO 1991012572A1 DK 9100037 W DK9100037 W DK 9100037W WO 9112572 A1 WO9112572 A1 WO 9112572A1
Authority
WO
WIPO (PCT)
Prior art keywords
fan
circuit
transistor
detecting means
temperature
Prior art date
Application number
PCT/DK1991/000037
Other languages
French (fr)
Inventor
Torben Dahl Rasmussen
Original Assignee
Esl-Kontormiljø A/S
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 Esl-Kontormiljø A/S filed Critical Esl-Kontormiljø A/S
Publication of WO1991012572A1 publication Critical patent/WO1991012572A1/en

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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
    • G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value
    • G05D23/1905—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value associated with tele control

Definitions

  • the present invention relates to a remote controlled inter-face adapter for providing of a temperature off set adjustment, respectively for activation of a safeguarding circuit, of a fan control circuit which includes a safeguarding circuit for its operation, whereby the circuit is of the type which includes a regulating transistor which is connected in series with the fan and regulates the rotational speed of the fan by controlling a DC current arriving from a DC voltage supply, and whereby the control in particular is of the type comprising means so that the series transistor receives its base voltage from an as emitter follower coupled transistor having its base provided with a control voltage which is determined by a temperature detecting means and is proportional, suitably, with the temperature within a temperature range and exhibits such direction of variation that an increasing temperature results in an increasing current through the transistor coupled as emitter follower and therethrough in an also increasing current through the fan, and whereby the circuit, which provides the said voltage to the base of the as emitter follower coupled transistor as being determined by the temperature detecting means and as being suitably proportional with this temperature, comprises means for limiting the
  • a circuit of the above mentioned type is described through Danish patent application No. 4486/SS being filed by the applicant.
  • the herefrom known type of circuit of prior art is applicable together with one or possibly more temperature detecting means, namely in that more such temperature detecting means then within the circuit, or the signals issuing from them, are coupled in parallel with each other.
  • the temperatur range becomes off set, and furthermore, that a failure to this off set or also to the line printer, taken as a whole, results in activating of the above mentioned safeguarding circuit.
  • the remote controlled interface adapter comprises a circuit-insulating and/or -dividing element, such as an opto coupler, of which one output terminal is connected to the entrance of the comparator being coupled to the vol tage supply of the temperature detecting means. and in that the other output terminal of the element is connected to a location within the circuit of the temperature detecting means where an increasing temperature influencing upon the temperature detecting means results in an increasing of the conductance of the as emitter follower coupled transistor.
  • Fig. 1 schematically illustrates the substantial features of an embodiment according to the present invention
  • FIG. 2 in more details illustrates the embodiment shown in Fig. 1.
  • a circuit-insulating and/or -dividing element in the shape of an opto coupler OTK having its output phototransistor as shown connected to the connecting lead between the entrance of a comparator 1A and the entrance of an operational amplifier IB.
  • a voltage may be connected to the entrance of the opto coupler.
  • the conductance of the output phototransistor is varying at least somewhat proportional to the value of the voltage being connected to the entrance of the opto coupler. At a certain upper value of the entrance voltage a further increasing hereof is not going to result in a further increasing conductance of the output phototransistor.
  • the resistor RB substantially may be regarded as short-circuited, under all circumstances it may be regarded in the way that the ohm-values, which present the elements in the temperature detecting means, have to be not too small to avoid unwanted heat-conditions in the circuit- It thus will correspond to the simulating of high temperature conditions for the temperature detecting means when the output photo transistor attains a strongly conducting condition.
  • the voltage at the point of connection Y by suitable choice of component values is lowered unto the mentioned minimum voltage which results in the minimum rotational speed of the fan V.
  • the safeguarding circuit SI becomes activated, and the fan is brought to operate at a suitable high rotational speed.
  • a change of the temperature detecting means circuit is achieved corresponding to the introducing of an off set of the temperature range and to the introducing of a change in the sensitivity of the temperature detecting means RT.

Abstract

A remote controlled interface adapter for providing of a temperature off set adjustment, respectively for activation of the operation safeguarding circuit (SI), of a fan control circuit comprises an emitter follower coupled control transistor (T1) which controls a between the fan (V) and a DC voltage supply (+) coupled regulating series transistor (T2) being operated from a signal lead (1B+) connected to a temperature detecting means (RT) and provides regulation of the rotational speed of the fan to be kept suitably proportional with the temperature at a temperature detecting means (RT). The safeguarding circuit (SI) is coupled to a lead (Y) connecting the series transistor (T2) and the fan (V) and serves to safeguard current supply to the fan (V) to keep at least a minimum rotational speed of the fan (V). Temperature range off set adjustment or regulating off set adjustment of the control to attain adaptability to varying fan cooling demands, in particular at smaller computer systems, is remote controlled achieved by interfacing the remote control to the control through a circuit-insulating or -dividing element, such as an opto coupler (OTK), having one output terminal in common with the voltage supply to the temperature detecting means (RT) circuit connected to a first comparator (1A) entrance (1A+) influencing on the control transistor (T1) and having the second entrance (1A-) connected to the connecting lead (Y). The other output terminal of the element (OTK) influences upon the temperature detecting means (RT) signal lead (1B+).

Description

REMOTE CONTROLLED INTERFACE ADAPTER FOR TEMPERATURE CONTROL COMPRISING SAFESUARDING CIRCUIT.
The present invention relates to a remote controlled inter-face adapter for providing of a temperature off set adjustment, respectively for activation of a safeguarding circuit, of a fan control circuit which includes a safeguarding circuit for its operation, whereby the circuit is of the type which includes a regulating transistor which is connected in series with the fan and regulates the rotational speed of the fan by controlling a DC current arriving from a DC voltage supply, and whereby the control in particular is of the type comprising means so that the series transistor receives its base voltage from an as emitter follower coupled transistor having its base provided with a control voltage which is determined by a temperature detecting means and is proportional, suitably, with the temperature within a temperature range and exhibits such direction of variation that an increasing temperature results in an increasing current through the transistor coupled as emitter follower and therethrough in an also increasing current through the fan, and whereby the circuit, which provides the said voltage to the base of the as emitter follower coupled transistor as being determined by the temperature detecting means and as being suitably proportional with this temperature, comprises means for limiting the regulation range, so that at least a minimum of rotational speed of the fan is achieved, and whereby, a second series transistor is coupled in parallel with the emitter-collector path of the first series tran- sistor, this second transistor being couDled with its base to receive a control voltage for the attaining of conducting condition whenever the fan during its operation from the series transistor receives a voltage which is smaller than the voltage which provides the minimum speed of rota tion of the fan, and whereby the means which limits the regulation range to provide at least a minimum of rotatio- speed of the fan comprises a comparator having an output being through an adapting means connected to the base of the as emitter follower coupled transistor and having a first entrance coupled to the voltage supply of the circuit of the temperature detecting means and having a second entrance coupled to the connecting lead between the fan and the series transistor, and whereby the direction of variation of the comparator output voltage is such that by a missing connection of a temperature detecting device and simultaneously occurring of a decreasing of the rotational speed of the fan an increasing of the base voltage is resulting in an increasing of the conductance of the as emitter follower coupled transistor.
A circuit of the above mentioned type is described through Danish patent application No. 4486/SS being filed by the applicant. The herefrom known type of circuit of prior art is applicable together with one or possibly more temperature detecting means, namely in that more such temperature detecting means then within the circuit, or the signals issuing from them, are coupled in parallel with each other. On the other hand, if, by way of example, within a smaller computer system a line printer has to be installed, and this printing device also requires fan- cooling, it may be advantageous if, with respect to control, the temperatur range becomes off set, and furthermore, that a failure to this off set or also to the line printer, taken as a whole, results in activating of the above mentioned safeguarding circuit.
This purpose is according to the invention attained in that the remote controlled interface adapter comprises a circuit-insulating and/or -dividing element, such as an opto coupler, of which one output terminal is connected to the entrance of the comparator being coupled to the vol tage supply of the temperature detecting means. and in that the other output terminal of the element is connected to a location within the circuit of the temperature detecting means where an increasing temperature influencing upon the temperature detecting means results in an increasing of the conductance of the as emitter follower coupled transistor.
In this respect a rather simple embodiment of the invention may be attained in that the other output terminal of the circuit-insulating and/or -dividing element is connected to the temperature detecting means signal lead connected to the fan regulating circuit.
Embodiments according to the invention are described in more details in the following under reference to the drawing, in which:
Fig. 1 schematically illustrates the substantial features of an embodiment according to the present invention, and
Fig. 2 in more details illustrates the embodiment shown in Fig. 1.
In the drawing elements performing the same or corresponding functions carry the same signs of references.
Enclosed is attached a copy of the specification and of the drawing of the above mentioned Danish patent application No. 4486/88 which at the date of the filing of the Danish priority patent application preceding this present application had been filed at the Danish Patent Office.
To this embodiment of prior art is connected a circuit-insulating and/or -dividing element in the shape of an opto coupler OTK having its output phototransistor as shown connected to the connecting lead between the entrance of a comparator 1A and the entrance of an operational amplifier IB. To the entrance of the opto coupler a voltage may be connected. The conductance of the output phototransistor is varying at least somewhat proportional to the value of the voltage being connected to the entrance of the opto coupler. At a certain upper value of the entrance voltage a further increasing hereof is not going to result in a further increasing conductance of the output phototransistor. When this condition exists, in practice the resistor RB substantially may be regarded as short-circuited, under all circumstances it may be regarded in the way that the ohm-values, which present the elements in the temperature detecting means, have to be not too small to avoid unwanted heat-conditions in the circuit- It thus will correspond to the simulating of high temperature conditions for the temperature detecting means when the output photo transistor attains a strongly conducting condition. Thereby, the voltage at the point of connection Y by suitable choice of component values is lowered unto the mentioned minimum voltage which results in the minimum rotational speed of the fan V. Herethrough, the safeguarding circuit SI becomes activated, and the fan is brought to operate at a suitable high rotational speed.
If a lower entrance voltage to OTK is chosen a change of the temperature detecting means circuit is achieved corresponding to the introducing of an off set of the temperature range and to the introducing of a change in the sensitivity of the temperature detecting means RT.

Claims

C L A I M S
1. A remote controlled interface adapter for providing of a temperature off set adjustment, resoectively for activation of a safeguarding circuit, of a fan control circuit which includes a safeguarding circuit for its operation (SI), whereby the circuit is of the type which includes a regulating transistor (T2) which is connected in series with the fan (V) and regulates the rotational speed of the fan (V) by controlling a DC current arriving from a DC voltage supply (+), and whereby the control in particular is of the type comprising means so that the series transistor (T2) receives its base voltage from an as emitter follower coupled transistor (T1) haaing its base provided with a control voltage which is determined by a temperature detecting means (RT) and is proportional, suitably, with the temperature within a temperature range and exhibits such direction of variation that an increasing temperature results in an increasing current through the transistor (T1) coupled as emitter follower and there- through in an also increasing current through the fan (V), and whereby the circuit, which supplies the said voltage to the base of the as emitter follower coupled transistor (T1) as being determined by the temperature detecting means (RT) and as being suitably proportional with this temperature, comprises means for limiming the regulation range, so that at least a minimum of rotational speed of the fan (V) is achieved, and whereby, a second series transistor (T4) is couoled in parallel with the emitter- collector path of the first series transistor (T2), this second transistor (T4) being couoied with its base to receive a control voltage for the attaining of conducting condition whenever the fan (V) during its operation from the seriee transistor (T2) receives a voltage which is smaller than the voltage which provides the minimum speed of rotation of the fan (V), and whereby the means which limits the regulation range to provide at least a minimum of rotational speed of the fan (V) comprises a comparator (1A) having an output being through an adapting means connected to the base of the as emitter follower coLipied transistor (T1) and having a first entrance (1A+) coupled to the voltage supply of the circuit of the temperature detecting means (RT) and having a second entrance (1A-) coupled to the connecting lead (Y) between the fan (V) and the series transistor (T2) and whereby the direction of variation of the comparator (1A) output voltage is such that by a missing connection of a temperature detecting means (RT) and simultaneously occurring of a decreasing of the rotational speed of the fan (V) an increasing of the base voltage is resulting in an increasing of the conductance of the as emitter follower coupied transistor (T1), c h a r a c t e r i z e d i n t h a t the remote controlled interface adapter comprises a circuit- insulating and -dividing element, such as an opto coupler (OTK) of which one output terminal is connected to the entrance (1A+) of the comparator (1A) being couuled to the voltage supply of the temperature detecting means (RT), and in that the other output terminal of the element (OTK) is connected to a location (1B+) within the circuit of the temperature detecting means (RT) where an increasing temperature influencing upon the temperature detecting means (RT) results in an increasing of the conductance of the as emitter follower coupled transistor (Tl).
2. Remote controlled interface adapter according to ciaiin 1 c h a r a c t e r i s e d i n t h a t the other output terminal of the circuit-insulating and -dividing element (DTK) is connected to the temperature detecting means (RT) signal lead (1B+) connected to the fan regulating circuit (T1, T2).
PCT/DK1991/000037 1990-02-08 1991-02-08 Remote controlled interface adapter for temperature control comprising safeguarding circuit WO1991012572A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK0329/90 1990-02-08
DK032990A DK32990D0 (en) 1990-02-08 1990-02-08 REMOTE CONTROL DEVICE FOR TEMPERATURE CONTROL WITH SECURITY CIRCUIT

Publications (1)

Publication Number Publication Date
WO1991012572A1 true WO1991012572A1 (en) 1991-08-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1991/000037 WO1991012572A1 (en) 1990-02-08 1991-02-08 Remote controlled interface adapter for temperature control comprising safeguarding circuit

Country Status (3)

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AU (1) AU7229991A (en)
DK (1) DK32990D0 (en)
WO (1) WO1991012572A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103488211A (en) * 2013-08-06 2014-01-01 奇瑞汽车股份有限公司 Intelligent machine box temperature control system and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4806832A (en) * 1982-11-23 1989-02-21 Papst Motoren Kg Fan with temperature controlled rotation speed
EP0321253A2 (en) * 1987-12-15 1989-06-21 Hussmann Corporation Interface adapter for interfacing a remote controller with commercial refrigeration and environmental control systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4806832A (en) * 1982-11-23 1989-02-21 Papst Motoren Kg Fan with temperature controlled rotation speed
EP0321253A2 (en) * 1987-12-15 1989-06-21 Hussmann Corporation Interface adapter for interfacing a remote controller with commercial refrigeration and environmental control systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103488211A (en) * 2013-08-06 2014-01-01 奇瑞汽车股份有限公司 Intelligent machine box temperature control system and method

Also Published As

Publication number Publication date
DK32990D0 (en) 1990-02-08
AU7229991A (en) 1991-09-03

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