EP0809168A1 - Geschütztes System gegen Übertemperatur - Google Patents

Geschütztes System gegen Übertemperatur Download PDF

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Publication number
EP0809168A1
EP0809168A1 EP97201433A EP97201433A EP0809168A1 EP 0809168 A1 EP0809168 A1 EP 0809168A1 EP 97201433 A EP97201433 A EP 97201433A EP 97201433 A EP97201433 A EP 97201433A EP 0809168 A1 EP0809168 A1 EP 0809168A1
Authority
EP
European Patent Office
Prior art keywords
voltage
temperature
supply
threshold
supply voltage
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP97201433A
Other languages
English (en)
French (fr)
Other versions
EP0809168B1 (de
Inventor
Laurent Dubos
Thierry Duval
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP0809168A1 publication Critical patent/EP0809168A1/de
Application granted granted Critical
Publication of EP0809168B1 publication Critical patent/EP0809168B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
    • G05F1/463—Sources providing an output which depends on temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00—Electricity: power supply or regulation systems
    • Y10S323/907—Temperature compensation of semiconductor

Definitions

  • the present invention relates to a method for limiting the power dissipated by an assembly of at least one electronic device, provided with a power supply which is of a type providing an adjustable voltage by an adjustment voltage.
  • the invention also relates to an assembly of at least one electronic device, provided with elements intended to limit its own dissipated power, and of a power supply which supplies it, said supply being of a type which supplies an adjustable voltage. by an adjustment voltage.
  • Such an assembly is for example a cable television distribution system.
  • Document DE 43 05 038 discloses a power MOSFET transistor, provided with elements intended to limit its own dissipated power, so as to avoid its destruction by overheating. The power is limited, when the own temperature of the transistor becomes excessive, by inserting a resistor in series in the control of the power element.
  • An object of the invention is to ensure perfectly safe operation in an assembly, even if certain elements are not protected against excessive temperature.
  • an adjustment voltage is generated such that it keeps the supply voltage constant as long as the temperature remains below a predetermined temperature threshold, and decreases the voltage of the supply all the more as the temperature increases, beyond said threshold.
  • the invention is therefore based on the idea of lowering the general supply voltage, rather than limiting the power dissipated by a particular component whose supply voltage would remain unchanged.
  • a progressive degradation of the linearity of the signals issued, instead of a sudden cut, or even destruction of the material.
  • At least two temperature thresholds are considered, each corresponding to a different amount of reduction in the supply voltage.
  • successive supply voltage variations are generated at the rate of a clock, variations in one direction or the other depending on whether the temperature threshold is exceeded or not.
  • An assembly according to the invention comprises a circuit for generating the supply adjustment voltage provided with a temperature probe, a circuit which generates an adjustment voltage such that it keeps the supply voltage constant as long as the temperature remains below a predetermined temperature threshold, and decreases the voltage of the power supply all the more as the temperature increases, beyond said threshold.
  • the circuit for generating an adjustment voltage is provided with at least two temperature thresholds, each corresponding to a different amount of reduction in the supply voltage.
  • the circuit for generating an adjustment voltage with two thresholds comprises two differential amplifiers, each switching for one of the temperature thresholds, and a resistance bridge, one of which is dependent on the temperature, two bridge branches supplied by a reference voltage, one of the branches being provided with at least three resistors, so as to provide two points in common between the resistors of this branch, the bridge thus having two diagonals to each of which are connected the respective inputs of one of the two differential amplifiers.
  • the circuit for generating an adjustment voltage comprises a differential amplifier and a resistance bridge, one of which is dependent on the temperature, a bridge of which a diagonal is supplied by a reference voltage, and in the other diagonal of which the inputs of the differential amplifier are connected, which thus switches over for a temperature threshold and whose output is connected to a digital circuit, generating variations in supply voltage in one direction or in the other according to the state of the differential amplifier, in successive steps at the rate of a clock.
  • the temperature probe is inside the case.
  • the power supply is a switching power supply.
  • FIG. 1 schematically represents a set of electronic devices, contained in at least one housing, with a variable voltage generator 17.
  • FIG. 2 represents a first variant diagram of the variable voltage generator 17 of FIG. 1.
  • FIG. 3 represents a second variant diagram of the variable voltage generator 17 of FIG. 1.
  • FIGS. 4 and 5 are diagrams showing how the voltage produced varies with temperature and as a function of time, in the case of the variant diagrams of FIGS. 2 and 3, respectively.
  • the power supply 14 is for example a known switching power supply, but it is clear that any power supply whose voltage is adjustable can also be suitable.
  • a first variant of the circuit 17 for generating an adjustment voltage comprises a source 1 of reference voltage, constant, which can be constructed from the supply 14, or alternatively be a device local.
  • This source feeds a resistor bridge, consisting of two branches each made of resistors in series, one of the branches consisting of resistors 2, 3, 4 in series, the other by resistors 5 and 7 in series.
  • the voltage taken from a diagonal of the bridge, on the one hand at the common point of resistors 5 and 7 and on the other hand at the common point of resistors 2 and 3, is applied, each time via a resistor, to the inputs + and - respectively of a first amplifier 10, with differential inputs, mounted with a moderate gain, and with a capacitive feedback, constituted by the capacitor 65, which provides a slowed response when the differential input voltage changes sign.
  • the output of amplifier 10 controls, via a resistor, the base of a transistor 9 mounted as an emitter follower, the emitter of which is connected via a load resistor, consisting of two resistors in series 8 and 67, to a reference voltage source 6. The voltage of the latter is between that of source 1 and that of ground.
  • the output of the amplifier 13 controls, via a resistor, the base of a transistor 12 mounted as an emitter follower, the emitter of which is connected by a load resistor consisting of the two resistors in series 11 and 67, to the reference voltage source 6.
  • the resistor 67 is therefore common to the loads of the two transistors 9 and 12.
  • the common point of the resistor 67 and the resistors 8 and 11 constitutes the output 19 of the circuit for generating the adjustment voltage, which controls the supply 14 .
  • Resistor 7 has a negative temperature coefficient.
  • the ratios of the resistance bridges 5,7 and 2,3,4 are such that, when the temperature is normal, that is to say when it is below a predetermined threshold, the voltage at the output of the two amplifiers is high, the transistors 9 and 12 are blocked, and the voltage applied to the connection 19 is then that of the reference 6.
  • the resistance 7 decreases and the voltage at the common point of the resistors 5 and 7 decreases.
  • a first threshold for example by 85 ° Celsius
  • the voltage at the common point of resistors 5 and 7 becomes lower than that at the common point of resistors 2 and 3, the amplifier 10 switches and transistor 9 becomes conductive, lowering the voltage at point 19 by predetermined amount.
  • the voltage at the common point of the resistors 5 and 7 reaches a value equal to that of the common point of the resistors 3 and 4, the amplifier 13 switches in turn and the transistor 12 becomes conductive, lowering the voltage at point 19 by an additional amount.
  • the voltage at 19 is illustrated in FIG. 4. It is assumed that, along the abscissa, the ambient temperature increases, then decreases again. For a normal temperature, that is to say below 85 ° Celsius, the voltage remains stable, for example at 24 volts. When the temperature exceeds 85 ° Celsius, the voltage decreases, for example to 20 volts. The transition from 24 to 20 volts is not abrupt, thanks to the capacity 65 ( Figure 2). When the temperature exceeds 90 ° Celsius, the voltage drops further to, for example, 16 volts. The transition from 20 to 16 volts is not abrupt, thanks to the capacity 66 ( Figure 2). If the temperature becomes more favorable, the voltage rises, conversely, to 20 volts then to 24 volts.
  • a second variant of the circuit 17 for generating an adjustment voltage comprises a source 31 of constant reference voltage, which can be constructed from the supply 14, or alternatively be a device local.
  • This source supplies a resistor bridge, consisting of two branches each made of two resistors in series, one of the branches consisting of resistors 32 and 34, the other by resistors 33 and 35.
  • the voltage taken between, on the one hand, the common point of resistors 33 and 35 and, on the other hand, the common point of resistors 32 and 34, is applied, each time via a resistance, to the differential input, respectively - and + of a amplifier 40, mounted with moderate gain, and with capacitive feedback, constituted by capacitor 37, which provides a slower response to the change in sign of the differential input voltage.
  • the circuit 17 further includes a clock 61, connected by a terminal 62 to an up / down module 41, the output 70 of which, with several conductors, is connected to an element 42 of the demultiplexer type.
  • the up / down module 41 easily constructed from commercial elements, has the function of providing a number, expressed in digital form, on the output 70 with several conductors, for example with three conductors, so as to be able to count from zero to eight, or 2 3 .
  • the number in question increases or decreases by one at each time of the clock 61, according to the voltage applied to a counting direction control input 51.
  • the output voltage of the amplifier 40 is applied to the input control of counting direction 51, via a resistance-capacity integrator assembly 68, 69.
  • the up / down counter 41 includes means so that the number which it produces comes to abut the zero value when it reaches the end of its downcounting capacity, or in abutment, here on the value eight, when it reaches the end of its counting capacity (unlike certain counters which, in such a case, loop, i.e. return to the other end of their counting range to continue counting or counting down).
  • the element of the demultiplexer type 42 receives as an input the number created on the output 70 by the module 41, and generates on eight outputs 53-60 logic signals (high or low), like a thermometer, it is that is, for a number having, on the output 70, the value 1, the only output 53 is high, for a number having, on the output 70, the value 2, the outputs 53 and 54 are high, for a number having the value 3, the outputs 53, 54, 55 are high, and so on.
  • Each of the outputs 53-60 is connected via a resistor to the base of a transistor respectively 23-30, mounted as an emitter follower, the emitter of which is connected by a load resistor consisting of the two resistors in series 64 and 43 respectively -50, to a reference voltage source 63.
  • the resistor 64 is therefore common to the loads of the eight transistors 23-30, and resistors 43-50 are all practically equal.
  • the common point of the resistor 64 and the resistors 43-50 constitutes the output 19 of the circuit for generating the adjustment voltage, which controls the supply 14.
  • the output of the amplifier 40 When the temperature is normal, the output of the amplifier 40 has a high value and the module 41 counts. Of course, it then stabilizes at the upper stop.
  • the output 70 carries the number eight, and 53-60 all outputs are in the high state: the eight transistors 23-30 are blocked, and the voltage 19 is maximum.
  • a set temperature for example 85 ° Celsius, the output of the amplifier 40 goes low, the module 41 counts down.
  • the clock 61 has for example a period of one minute.
  • FIG. 5 illustrates the shape of the voltage obtained, during the time.
  • A is represented the voltage at the output of the amplifier 40
  • B the voltage on the output 19.
  • FIG. 4 it is supposed that, along the abscissa, the ambient temperature increases, then decreases which causes the voltage at the output of amplifier 40 to return to the high state after a certain time, and the voltage on output 19 then rises step by step.
  • the assembly finally achieves a very long time constant for the voltage variations on the output 19.
  • the demultiplexer element 42 could be removed by connecting the transistors 23-30 directly to the conductors of the output 70, the resistors 43-50 then having values providing different weights, such as the current supplied in one of the resistors 43-50, when one of the transistors 23-30 is conductor, represents the power of two corresponding to the conductor to which transistor 23-30 is connected: here 1, 2, or 4.
  • the apparatuses 20-22 are all contained here in the same housing 18. It is clear, here again, that this is in no way mandatory. One could as well imagine that the elements 20-22 are contained in separate housings or, on the contrary, that the elements contained in the separate housings 17 and 18 are all placed in the same housing. Similarly, the power supply 14 can be included in one of the boxes 17 or 18.
  • a known constant power source can be provided to perform certain functions for which the drop in the supply voltage would cause an interruption in service. It can for example be provided that the power elements are all supplied by the power supply regulated according to the temperature, while the circuits which do not dissipate much power are supplied from a fixed supply.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Amplifiers (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
EP97201433A 1996-05-22 1997-05-13 Geschütztes System gegen Übertemperatur Expired - Lifetime EP0809168B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9606358 1996-05-22
FR9606358 1996-05-22

Publications (2)

Publication Number Publication Date
EP0809168A1 true EP0809168A1 (de) 1997-11-26
EP0809168B1 EP0809168B1 (de) 2002-08-14

Family

ID=9492354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97201433A Expired - Lifetime EP0809168B1 (de) 1996-05-22 1997-05-13 Geschütztes System gegen Übertemperatur

Country Status (4)

Country Link
US (1) US5939872A (de)
EP (1) EP0809168B1 (de)
JP (1) JPH1075530A (de)
DE (1) DE69714650T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008137625A2 (en) * 2007-05-03 2008-11-13 Dsm Solutions, Inc. Method and system for adaptive power management

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6204720B1 (en) * 1998-10-09 2001-03-20 Elantec Semiconductor, Inc. Load current control circuitry for power supplies driving a common load for providing a uniform temperature distribution
US6087820A (en) * 1999-03-09 2000-07-11 Siemens Aktiengesellschaft Current source
US6829128B2 (en) * 2002-01-03 2004-12-07 Dell Products L.P. Thermal trip power control circuit
US8816192B1 (en) 2007-02-09 2014-08-26 Borealis Technical Limited Thin film solar cell
US20090079406A1 (en) * 2007-09-26 2009-03-26 Chaodan Deng High-voltage tolerant low-dropout dual-path voltage regulator with optimized regulator resistance and supply rejection

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000643A (en) * 1976-03-29 1977-01-04 Honeywell Inc. Apparatus for producing a compensating voltage
US4298835A (en) * 1979-08-27 1981-11-03 Gte Products Corporation Voltage regulator with temperature dependent output
US4306183A (en) * 1979-03-14 1981-12-15 Lucas Industries Limited Voltage regulation circuit for a solar cell charging system
EP0104770A2 (de) * 1982-08-27 1984-04-04 Fujitsu Limited Temperaturabhängiger Spannungsgeneratorkreis
US4990846A (en) * 1990-03-26 1991-02-05 Delco Electronics Corporation Temperature compensated voltage reference circuit
DE4123416A1 (de) * 1991-07-15 1993-01-21 Siemens Ag Spannungsversorgungseinrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789190A (en) * 1972-10-17 1974-01-29 A J Matlen Temperature regulation for electrical heater
FR2288971A1 (fr) * 1974-10-25 1976-05-21 Radiotechnique Compelec Dispositif capteur de temperature fournissant une pluralite de tensions de consigne a partir d'une sonde unique
US4184634A (en) * 1978-04-18 1980-01-22 The Bendix Corporation Closed loop control for automatic temperature control system
SE442079B (sv) * 1982-02-08 1985-11-25 Tocksfors Verkstads Ab Kretsanordning for reglering av ett elvermeelements temperatur
US4523429A (en) * 1983-04-01 1985-06-18 Rca Corporation Cold start surge current limiting system for a hydrazine thruster augmentation heater
DE3818974A1 (de) * 1988-06-03 1990-02-08 Ruthenberg Gmbh Waermetechnik Regel- und ueberwachungsschaltung fuer elektrische sitzheizungen, insbesondere von kraftfahrzeugen
DE4305038C2 (de) * 1993-02-18 1998-02-05 Siemens Ag MOSFET mit Temperaturschutz

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000643A (en) * 1976-03-29 1977-01-04 Honeywell Inc. Apparatus for producing a compensating voltage
US4306183A (en) * 1979-03-14 1981-12-15 Lucas Industries Limited Voltage regulation circuit for a solar cell charging system
US4298835A (en) * 1979-08-27 1981-11-03 Gte Products Corporation Voltage regulator with temperature dependent output
EP0104770A2 (de) * 1982-08-27 1984-04-04 Fujitsu Limited Temperaturabhängiger Spannungsgeneratorkreis
US4990846A (en) * 1990-03-26 1991-02-05 Delco Electronics Corporation Temperature compensated voltage reference circuit
DE4123416A1 (de) * 1991-07-15 1993-01-21 Siemens Ag Spannungsversorgungseinrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008137625A2 (en) * 2007-05-03 2008-11-13 Dsm Solutions, Inc. Method and system for adaptive power management
WO2008137625A3 (en) * 2007-05-03 2008-12-24 Dsm Solutions Inc Method and system for adaptive power management

Also Published As

Publication number Publication date
EP0809168B1 (de) 2002-08-14
DE69714650D1 (de) 2002-09-19
DE69714650T2 (de) 2003-02-20
US5939872A (en) 1999-08-17
JPH1075530A (ja) 1998-03-17

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