WO1994003849A1 - Arrangement for controlling the temperature of electronic components - Google Patents

Arrangement for controlling the temperature of electronic components Download PDF

Info

Publication number
WO1994003849A1
WO1994003849A1 PCT/FI1993/000306 FI9300306W WO9403849A1 WO 1994003849 A1 WO1994003849 A1 WO 1994003849A1 FI 9300306 W FI9300306 W FI 9300306W WO 9403849 A1 WO9403849 A1 WO 9403849A1
Authority
WO
WIPO (PCT)
Prior art keywords
peltier element
power supply
arrangement
controlling
temperature
Prior art date
Application number
PCT/FI1993/000306
Other languages
French (fr)
Inventor
Denis O'shea
Eero Sirola
Hemmo RISTIMÄKI
Original Assignee
Nokia Telecommunications Oy
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 Nokia Telecommunications Oy filed Critical Nokia Telecommunications Oy
Priority to AU45726/93A priority Critical patent/AU4572693A/en
Priority to DE4393699T priority patent/DE4393699T1/en
Publication of WO1994003849A1 publication Critical patent/WO1994003849A1/en

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
    • G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/024—Arrangements for thermal management
    • H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
    • H01S5/02415—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling by using a thermo-electric cooler [TEC], e.g. Peltier element

Definitions

  • the invention relates to an arrangement for controlling the temperature of electronic components, the arrangement comprising a detecting means for measur ⁇ ing the temperature of an electronic component and for producing a control signal varying with the temperature; a Peltier element connected heat-conductively to an electronic component for cooling or heating the elec ⁇ tronic component in accordance with the strength of the current flowing through the Peltier element; a power supply for supplying current to the Peltier element; a control means for controlling the direction of the current flowing through the Peltier element in response to the control signal produced by the detecting means; a second control means for controlling the strength of the current flowing through the Peltier element in response to the control signal produced by the detecting means.
  • a typical prior art solution for controlling the temperature of electronic components and supplying power to the Peltier element that controls the temperat ⁇ ure is to connect a conventional power supply of e.g. ⁇ 5 V to a switched-mode power supply and to a branch supplying other current-consuming elements in the same circuit card.
  • the Peltier element controlling the tem ⁇ perature of electronic components, e.g. of a laser transmitter, is then connected to the outlet of the switched-mode power supply.
  • the disadvantage of the prior art solution is that the switched-mode power supply supplying the Peltier element causes a great loss of power in view of the power it supplies to the Peltier element.
  • the char- acteristic feature of this kind of circuit arrangement is thus that in the circuit both a Peltier element and a switched-mode power supply consume power.
  • the object of the present invention is to make the heat controlling circuit of the electronic component more advantageous and less power-consuming by the use of a Peltier element.
  • This new kind of arrangement for controlling the temperature of electronic components is achieved with the arrangement of the present invention, which is characterised in that the power supply supplying the Peltier element is the power supply of the electronic component with a controllable temperature, and that the Peltier element is connected in series with the power supply.
  • the invention is based on the idea that one or more electronic components are supplied directly from the power supply via the Peltier element.
  • the invention is especially advantageous in optical transmitters, in which the temperatures of laser transmitters or corresponding semiconducting components are to be controlled.
  • the Peltier element is supplied from a different power supply from the actual laser transmitter, i.e. two power supplies are used.
  • the inven- tion only one power supply is needed for the laser transmitter and the Peltier element, which controls the temperature of the laser.
  • the heat control of the laser transmitter is much more advantage ⁇ ous since fewer apparatuses are needed, and less space for them.
  • control means controlling the Peltier element comprises a bridge connection having at least one Peltier element connected in series between its two poles, and a compar- ison means, e.g. an amplifier, comparing the measuring signal produce&rby the detecting means with a reference value and producing a control signal.
  • the control signal controls the bJ frige connection by supplying current through the Peltier element to a certain direction when the measuring signal is lower than the reference value and to the opposite direction when the measuring signal is higher than the reference value.
  • the bridge connec ⁇ tion does not supply any current to the Peltier elements when the measuring signal produced by the detecting means is within the voltage range desired, i.e. in the immediate vicinity of the reference value.
  • the advantage of the arrangement according to the invention is thus that it produces no leakage current when it is in off mode.
  • the arrangement of the invention does not consume power when the temperature of the laser transmitter is within the range desired.
  • the circuit provided by the switched-mode power supply consumes power incessantly to generate working voltage.
  • the arrangement of the invention is thus more effective in respect of energy consumption and does not require great input power.
  • Fig. 1 shows a general block diagram of the arrangement according to the invention, in which the diode laser transmitter is supplied from the same power supply as the Peltier element,
  • Fig. 2 shows an embodiment of the arrangement according to the invention.
  • Fig. 1 shows a solution typical of the inven ⁇ tion, in which a conventional power supply PS of e.g. ⁇ 7 V is connected in parallel with a control means SU, e.g. a shunt resistor, and a Peltier element P.
  • the power supply transforms primary voltage Vin of e.g. +48 V into self-generated voltage Vout of e.g. +5 V.
  • the direction of the current flowing through the Peltier element is controlled by a control means BC. It controls the direction of the current flowing through the Peltier element e.g. by means of a bridge connection. When the current flows through the Peltier element P to a first direction, the Peltier element cools itself and the diode laser transmitter to which it is heat-conductively connected.
  • a detecting means TE e.g. a thermistor
  • a thermistor is heat- conductively connected to the diode laser transmitter.
  • One pole of the thermistor is connected to supply voltage of e.g. +5 V.
  • the thermistor measures the temp ⁇ erature of the diode laser transmitter and produces a measuring signal Ml according to the temperature measured, the signal being connected to a first pole of a comparison means Al, e.g. a comparator, and to a resistor Rl, which together with the thermistor provides a voltage divider.
  • a second pole of the comparison means here positive +, is connected to a reference voltage Vref1.
  • the outlet of the comparison means Al is connected to a controller SC of a control means or shunt resistor SU and to a second control means BC controlling the bridge connection.
  • the comparison means Al is typically an amplifier; the voltage obtained from its outlet varies with the voltage difference between the voltage or measuring signal Ml produced by thermistor TE/ resistor Rl voltage distribution and the reference voltage Vref1. This voltage controls the second control means BC and the controller SC of the shunt resistor.
  • the second control means BC may operate e.g.
  • the comparison means Al detects this from the measuring signal Ml sent by the thermistor TE and sends an instruction signal to the second control means BC - which controls the bridge connection - instructing the second controlling means BC to control the bridge connection in such a way that the bridge connection allows the current to flow through the Peltier element P to a first direction so that the Peltier element has a heating effect. Simultaneously the comparison means Al sends an instruction signal to the controller SC of the shunt resistor SU. Due to the instruction signal, the shunt resistor SU increases its resistance, and thus more current flows through the Peltier element and the Peltier element has a stronger heating effect. If the temperature measured by the thermistor TE is within an acceptable range, e.g.
  • the comparison means Al sends to the second control means BC an instruction signal which instructs the bridge connection to disconnect the Peltier element from the other circuit elements so that no current is supplied to it, whereby it neither heats nor cools its surroundings.
  • the comparison means Al detects this from the measuring signal Ml sent by the thermistor TE and sends an instruction signal to the second control means BC controlling the bridge connection, instructing the second control means BC to control the bridge connection in such a way that it allows current to flow through the Peltier element P to a second direction so that the Peltier element has a cooling effect.
  • the comparison means ⁇ 1 sends to the controller SC of the shunt resistor SU an instruction signal which makes the shunt resistor SU increase its resistance, and thus more current flows through the Peltier element and the Peltier element has a stronger cooling effect.
  • the out- put voltage Vout of the circuit arrangement is connected via a feedback loop FB to a first inlet of the second comparison means A2, e.g. a differential amplifier.
  • a second inlet of the comparison means A2 or the ampli ⁇ bomb is connected to a second reference voltage Vref2.
  • the comparison means A2 compares the voltage Vout supplied by the feedback loop with the reference voltage Vref2 and sends a control signal via its outlet to the power supply PS; if Vout falls below a certain limit, e.g. the reference voltage Vref2, the power supply PS supplies more power to the shunt connection between the Peltier element P and the shunt resistor SU, and corresponding ⁇ ly, if Vout is above the reference voltage Vref2, the power supply PS supplies less power to the shunt connec ⁇ tion between the Peltier element P and the shunt resistor SU.
  • the feedback loop FB and the second compar ⁇ ison means A2 are usually arranged to be in connection with the power supply PS.
  • Fig. 2 shows an embodiment in which the second control means BC and the controller SC of the shunt resistor SU are connected to a single differential amp ⁇ lifier.
  • To one pole of the resistor R5 is connected working voltage and to the other, a resistor R4.
  • a reference voltage Vref1 forms between the resistors and is conducted to the base of a transistor Q2.
  • Transistors Ql, Q2 and Q3 and resistors R2, R3, R6, R7 and R8 form a comparison means Al, or a comparator, i.e. in practice a conventional differential amplifier.
  • Its outlet is connected via diodes Dl to D4 to the gate of a JFET Q4.
  • the JFET operates as a shunt resistor.
  • the diodes Dl to D4 enable controlling of the shunt resistor both when the Peltier element is cooling and when it is heating.
  • the voltage of the thermistor branch is greater than Vrefl, whereby the collector voltage of the transistor Ql is lower than that of the transistor Q2.
  • the JFET Q4 is thus controlled via the diodes D3 and D4.
  • the JFET Q4 is controlled via the diodes Dl and D2.
  • the second control means BC control ⁇ ling the bridge connection is formed by transistors Q5 and Q6 and a relay RE1.
  • the collectors of the tran ⁇ sistors Q5 and Q6 are connected to an inlet of the relay RE1.
  • the emitter of the transistor Q5 is connected to the base of the transistor Q6, and the emitter of the transistor Q6 is connected to the ground potential.
  • To the base of the transistor Q5 is connected outlet voltage of the comparison means Al, the outlet voltage controlling the operation of the relay RE1.
  • the contacts of the relay RE1 provide a bridge connection.
  • the collector voltage of the transistor Q2 is higher than two diode voltages (Dl and D2) and sufficient to bring the tran ⁇ sistors Q5 and Q6 to a conductive state, whereby the operating current of the relay RE1 connects the current to flow through the Peltier element P to the direction desired.

Abstract

The invention relates to an arrangement for controlling the temperature of electronic components, the arrangement comprising a detecting means (TE) for measuring the temperature of an electronic component and for producing a control signal (M1) varying with the temperature; a Peltier element (P) connected heat-conductively to the electronic component for controlling the temperature of the electronic component in accordance with the strength of the current flowing through the Peltier element (P); a power supply (PS) for supplying current to the Peltier element (P); a control means (BC) for controlling the direction of the current flowing through the Peltier element (P) in response to the control signal (M1) produced by the detecting means (TE); and a second control means (SU) for controlling the strength of the current flowing through the Peltier element (P) in response to the control signal (M1) produced by the detecting means (TE). In the arrangement the power supply (PS) supplying the Peltier element (P) is the power supply of the electronic component with a controllable temperature, and the power supply (PS) is connected in series with the Peltier element (P).

Description

Arrangement for controlling the temperature of elec¬ tronic components
The invention relates to an arrangement for controlling the temperature of electronic components, the arrangement comprising a detecting means for measur¬ ing the temperature of an electronic component and for producing a control signal varying with the temperature; a Peltier element connected heat-conductively to an electronic component for cooling or heating the elec¬ tronic component in accordance with the strength of the current flowing through the Peltier element; a power supply for supplying current to the Peltier element; a control means for controlling the direction of the current flowing through the Peltier element in response to the control signal produced by the detecting means; a second control means for controlling the strength of the current flowing through the Peltier element in response to the control signal produced by the detecting means.
A typical prior art solution for controlling the temperature of electronic components and supplying power to the Peltier element that controls the temperat¬ ure is to connect a conventional power supply of e.g. ±5 V to a switched-mode power supply and to a branch supplying other current-consuming elements in the same circuit card. The Peltier element controlling the tem¬ perature of electronic components, e.g. of a laser transmitter, is then connected to the outlet of the switched-mode power supply.
The disadvantage of the prior art solution is that the switched-mode power supply supplying the Peltier element causes a great loss of power in view of the power it supplies to the Peltier element. The char- acteristic feature of this kind of circuit arrangement is thus that in the circuit both a Peltier element and a switched-mode power supply consume power.
The object of the present invention is to make the heat controlling circuit of the electronic component more advantageous and less power-consuming by the use of a Peltier element.
This new kind of arrangement for controlling the temperature of electronic components is achieved with the arrangement of the present invention, which is characterised in that the power supply supplying the Peltier element is the power supply of the electronic component with a controllable temperature, and that the Peltier element is connected in series with the power supply. The invention is based on the idea that one or more electronic components are supplied directly from the power supply via the Peltier element.
The invention is especially advantageous in optical transmitters, in which the temperatures of laser transmitters or corresponding semiconducting components are to be controlled. Typically in the prior art solu¬ tions the Peltier element is supplied from a different power supply from the actual laser transmitter, i.e. two power supplies are used. In the solution of the inven- tion, only one power supply is needed for the laser transmitter and the Peltier element, which controls the temperature of the laser. On account of this, the heat control of the laser transmitter is much more advantage¬ ous since fewer apparatuses are needed, and less space for them.
In a preferred embodiment of the invention the control means controlling the Peltier element comprises a bridge connection having at least one Peltier element connected in series between its two poles, and a compar- ison means, e.g. an amplifier, comparing the measuring signal produce&rby the detecting means with a reference value and producing a control signal. The control signal controls the bJ frige connection by supplying current through the Peltier element to a certain direction when the measuring signal is lower than the reference value and to the opposite direction when the measuring signal is higher than the reference value. The bridge connec¬ tion does not supply any current to the Peltier elements when the measuring signal produced by the detecting means is within the voltage range desired, i.e. in the immediate vicinity of the reference value. The advantage of the arrangement according to the invention is thus that it produces no leakage current when it is in off mode. In addition, the arrangement of the invention does not consume power when the temperature of the laser transmitter is within the range desired. During the use, the circuit provided by the switched-mode power supply consumes power incessantly to generate working voltage. The arrangement of the invention is thus more effective in respect of energy consumption and does not require great input power.
In the following the invention will be described in greater detail with reference to the accompanying drawings, wherein Fig. 1 shows a general block diagram of the arrangement according to the invention, in which the diode laser transmitter is supplied from the same power supply as the Peltier element,
Fig. 2 shows an embodiment of the arrangement according to the invention.
Fig. 1 shows a solution typical of the inven¬ tion, in which a conventional power supply PS of e.g. ±7 V is connected in parallel with a control means SU, e.g. a shunt resistor, and a Peltier element P. The power supply transforms primary voltage Vin of e.g. +48 V into self-generated voltage Vout of e.g. +5 V. The direction of the current flowing through the Peltier element is controlled by a control means BC. It controls the direction of the current flowing through the Peltier element e.g. by means of a bridge connection. When the current flows through the Peltier element P to a first direction, the Peltier element cools itself and the diode laser transmitter to which it is heat-conductively connected. Correspondingly, when the current flows to a second direction through the Peltier element P, the Peltier element P heats itself and the diode laser transmitter. In addition to the Peltier element P, a detecting means TE, e.g. a thermistor, is heat- conductively connected to the diode laser transmitter. One pole of the thermistor is connected to supply voltage of e.g. +5 V. The thermistor measures the temp¬ erature of the diode laser transmitter and produces a measuring signal Ml according to the temperature measured, the signal being connected to a first pole of a comparison means Al, e.g. a comparator, and to a resistor Rl, which together with the thermistor provides a voltage divider. A second pole of the comparison means, here positive +, is connected to a reference voltage Vref1. The outlet of the comparison means Al is connected to a controller SC of a control means or shunt resistor SU and to a second control means BC controlling the bridge connection. The comparison means Al is typically an amplifier; the voltage obtained from its outlet varies with the voltage difference between the voltage or measuring signal Ml produced by thermistor TE/ resistor Rl voltage distribution and the reference voltage Vref1. This voltage controls the second control means BC and the controller SC of the shunt resistor. The second control means BC may operate e.g. in such a way that when the output voltage of the comparison means Al is negative, current is conducted through the Peltier element P to a cooling direction, and when the output voltage of the comparison means Al is positive, current is conducted through the Peltier element to a heating direction. It can here be assumed that in a balanced state where neither cooling nor heating is necessary, the output voltage of the comparison means Al is 0 V. Thus, if the temperature measured by the thermistor TE is too low, e.g. 0°C, the comparison means Al detects this from the measuring signal Ml sent by the thermistor TE and sends an instruction signal to the second control means BC - which controls the bridge connection - instructing the second controlling means BC to control the bridge connection in such a way that the bridge connection allows the current to flow through the Peltier element P to a first direction so that the Peltier element has a heating effect. Simultaneously the comparison means Al sends an instruction signal to the controller SC of the shunt resistor SU. Due to the instruction signal, the shunt resistor SU increases its resistance, and thus more current flows through the Peltier element and the Peltier element has a stronger heating effect. If the temperature measured by the thermistor TE is within an acceptable range, e.g. in the vicinity of 25°C, the comparison means Al sends to the second control means BC an instruction signal which instructs the bridge connection to disconnect the Peltier element from the other circuit elements so that no current is supplied to it, whereby it neither heats nor cools its surroundings. Correspondingly, if the temperature measured by the thermistor TE is too high, e.g. 50°C, the comparison means Al detects this from the measuring signal Ml sent by the thermistor TE and sends an instruction signal to the second control means BC controlling the bridge connection, instructing the second control means BC to control the bridge connection in such a way that it allows current to flow through the Peltier element P to a second direction so that the Peltier element has a cooling effect. Simultaneously the comparison means ^1 sends to the controller SC of the shunt resistor SU an instruction signal which makes the shunt resistor SU increase its resistance, and thus more current flows through the Peltier element and the Peltier element has a stronger cooling effect. The out- put voltage Vout of the circuit arrangement is connected via a feedback loop FB to a first inlet of the second comparison means A2, e.g. a differential amplifier. To a second inlet of the comparison means A2 or the ampli¬ fier is connected a second reference voltage Vref2. The comparison means A2 compares the voltage Vout supplied by the feedback loop with the reference voltage Vref2 and sends a control signal via its outlet to the power supply PS; if Vout falls below a certain limit, e.g. the reference voltage Vref2, the power supply PS supplies more power to the shunt connection between the Peltier element P and the shunt resistor SU, and corresponding¬ ly, if Vout is above the reference voltage Vref2, the power supply PS supplies less power to the shunt connec¬ tion between the Peltier element P and the shunt resistor SU. The feedback loop FB and the second compar¬ ison means A2 are usually arranged to be in connection with the power supply PS.
Fig. 2 shows an embodiment in which the second control means BC and the controller SC of the shunt resistor SU are connected to a single differential amp¬ lifier. To one pole of the resistor R5 is connected working voltage and to the other, a resistor R4. A reference voltage Vref1 forms between the resistors and is conducted to the base of a transistor Q2. Transistors Ql, Q2 and Q3 and resistors R2, R3, R6, R7 and R8 form a comparison means Al, or a comparator, i.e. in practice a conventional differential amplifier. Its outlet is connected via diodes Dl to D4 to the gate of a JFET Q4. The JFET operates as a shunt resistor. The diodes Dl to D4 enable controlling of the shunt resistor both when the Peltier element is cooling and when it is heating. When the Peltier element is cooling, the voltage of the thermistor branch is greater than Vrefl, whereby the collector voltage of the transistor Ql is lower than that of the transistor Q2. The JFET Q4 is thus controlled via the diodes D3 and D4. When the Peltier element is heating, the JFET Q4 is controlled via the diodes Dl and D2. The second control means BC control¬ ling the bridge connection is formed by transistors Q5 and Q6 and a relay RE1. The collectors of the tran¬ sistors Q5 and Q6 are connected to an inlet of the relay RE1. The emitter of the transistor Q5 is connected to the base of the transistor Q6, and the emitter of the transistor Q6 is connected to the ground potential. To the base of the transistor Q5 is connected outlet voltage of the comparison means Al, the outlet voltage controlling the operation of the relay RE1. The contacts of the relay RE1 provide a bridge connection. When the Peltier element is intended to cool, the collector voltage of the transistor Q2 is higher than two diode voltages (Dl and D2) and sufficient to bring the tran¬ sistors Q5 and Q6 to a conductive state, whereby the operating current of the relay RE1 connects the current to flow through the Peltier element P to the direction desired.
The drawings and their description are to be understood only as illustrating the idea of the inven¬ tion. The arrangement according to the invention for controlling the temperature of the electronic components may vary in details within the scope of the claims. Although the invention is described above mainly in connection with laser transmitters, the arrangement can also be used for controlling the temperature of some other kind of electronic component.

Claims

Claims
1. An arrangement for controlling the temper¬ ature of electronic components, the arrangement compris- ing a detecting means (TE) for measuring the temp¬ erature of an electronic component and for producing a control signal (Ml) varying with the temperature; a Peltier element (P) connected heat-conduct- ively to an electronic component for controlling the temperature of the electronic component in accordance with the strength of the current flowing through the
Peltier element (P); a power supply (PS) for supplying current to the Peltier element (P); a control means (BC) for controlling the direction of the current flowing through the Peltier element (P) in response to the control signal (Ml) pro¬ duced by the detecting means (TE); a second control means (SU) for controlling the strength of the current flowing through the Peltier element (P) in response to the control signal (Ml) pro¬ duced by the detecting means (TE) , c h a r a c t e r i s e d in that the power supply (PS) supplying the Peltier element (P) is the power supply of the electronic component with a controllable temper¬ ature, and that the Peltier element (P) is connected in series with the power supply (PS) .
2. The arrangement of claim 1, c h a r a c - t e r i s e d in that the control means (SU) is a con¬ trollable shunt resistor.
3. The arrangement of claim 1, c h a r a c ¬ t e r i s e d in that the control means (SU) is a con¬ trollable resistor connected in parallel with the Peltier element (P).
4. The arrangement of claim 1, c h a r a c ¬ t e r i s e d in that the power supply (PS) operates in response to an outlet voltage (Vout) from the outlet of the arrangement, the outlet voltage being connected to control the power supply (PS) via a feedback loop (FB) and an amplified (A2).
PCT/FI1993/000306 1992-08-03 1993-07-28 Arrangement for controlling the temperature of electronic components WO1994003849A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU45726/93A AU4572693A (en) 1992-08-03 1993-07-28 Arrangement for controlling the temperature of electronic components
DE4393699T DE4393699T1 (en) 1992-08-03 1993-07-28 Arrangement for temperature control in electronic components

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI923493 1992-08-03
FI923493A FI96262C (en) 1992-08-03 1992-08-03 Arrangement for controlling the temperature of electronic components

Publications (1)

Publication Number Publication Date
WO1994003849A1 true WO1994003849A1 (en) 1994-02-17

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DE (1) DE4393699T1 (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003046702A2 (en) * 2001-11-29 2003-06-05 Active Cool Ltd. Active cooling system for cpu
WO2003058368A1 (en) * 2002-01-08 2003-07-17 Photon-X, Inc. Temperature controller module

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042075A1 (en) * 2004-08-31 2005-10-20 Infineon Technologies Ag Electronic circuit structure to act as a semiconductor/chip component has an electronic circuit unit, an energy supply unit and communications bus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093942A1 (en) * 1982-04-30 1983-11-16 Alcatel Semiconductor laser cooling device
US4571728A (en) * 1982-04-09 1986-02-18 Olympus Optical Co., Ltd. Temperature control device for a semiconductor laser
EP0395259A2 (en) * 1989-04-27 1990-10-31 Nortel Networks Corporation Temperature control system for solid state light source
US5088098A (en) * 1990-10-16 1992-02-11 General Instrument Corporation Thermoelectric cooler control circuit
US5118964A (en) * 1990-09-26 1992-06-02 At&T Bell Laboratories Thermo-electric temperature control arrangement for laser apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571728A (en) * 1982-04-09 1986-02-18 Olympus Optical Co., Ltd. Temperature control device for a semiconductor laser
EP0093942A1 (en) * 1982-04-30 1983-11-16 Alcatel Semiconductor laser cooling device
EP0395259A2 (en) * 1989-04-27 1990-10-31 Nortel Networks Corporation Temperature control system for solid state light source
US5118964A (en) * 1990-09-26 1992-06-02 At&T Bell Laboratories Thermo-electric temperature control arrangement for laser apparatus
US5088098A (en) * 1990-10-16 1992-02-11 General Instrument Corporation Thermoelectric cooler control circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003046702A2 (en) * 2001-11-29 2003-06-05 Active Cool Ltd. Active cooling system for cpu
WO2003046702A3 (en) * 2001-11-29 2004-01-29 Active Cool Ltd Active cooling system for cpu
US7185500B2 (en) 2001-11-29 2007-03-06 Active Cool Research And Development Ltd Active cooling system for CPU
WO2003058368A1 (en) * 2002-01-08 2003-07-17 Photon-X, Inc. Temperature controller module

Also Published As

Publication number Publication date
FI923493A0 (en) 1992-08-03
DE4393699T1 (en) 1995-07-20
FI96262B (en) 1996-02-15
FI96262C (en) 1996-05-27
FI923493A (en) 1994-02-04
AU4572693A (en) 1994-03-03

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