US20150349570A1 - Method for operating a portable electronic device - Google Patents

Method for operating a portable electronic device Download PDF

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Publication number
US20150349570A1
US20150349570A1 US14/410,963 US201314410963A US2015349570A1 US 20150349570 A1 US20150349570 A1 US 20150349570A1 US 201314410963 A US201314410963 A US 201314410963A US 2015349570 A1 US2015349570 A1 US 2015349570A1
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United States
Prior art keywords
electronic device
portable electronic
energy storage
ambient temperature
charging current
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Abandoned
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US14/410,963
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English (en)
Inventor
Dominik Niederberger
Dominic Boni
Andrea SACCHETTI
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Sensirion AG
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Sensirion AG
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Assigned to SENSIRION AG reassignment SENSIRION AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BONI, DOMINIC, Sacchetti, Andrea, Niederberger, Dominik
Publication of US20150349570A1 publication Critical patent/US20150349570A1/en
Abandoned legal-status Critical Current

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    • H02J7/0072—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • G06F1/206—Cooling means comprising thermal management
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
    • G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/20—Compensating for effects of temperature changes other than those to be measured, e.g. changes in ambient temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0052—
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Definitions

  • the present invention relates to a portable electronic device, to a method for operating a portable electronic device, and to a computer program element for operating a portable electronic device.
  • a portable electronic device such as a mobile phone, a tablet computer or another portable computing device, which portable electronic device typically comprises an energy storage for supplying energy for operating the portable electronic device.
  • portable electronic devices are provided.
  • the portable electronic device comprises a temperature sensor for sensing an ambient temperature of the portable electronic device which temperature sensor typically provides a sufficient coupling to the environment of the portable electronic device, e.g. by being exposed to the ambient through openings in a housing of the device or other means.
  • the present portable electronic device comprises a compensator for compensating for such perturbance and for determining a compensated ambient temperature which preferably better reflects the real ambient temperature.
  • This compensated ambient temperature represents an estimate of the real ambient temperature based on the sensed ambient temperature as supplied by the temperature sensor and by taking into account the heat generated during recharging the energy storage by means of information related to a charging current, or, alternatively or in addition by a temperature of the energy storage sensed by another temperature sensor.
  • Such other temperature sensor preferably is arranged at or close to the energy storage in case the temperature of the energy storage shall be sensed and contribute to the compenastion.
  • the sensed ambient temperature preferably may be corrected by a temperature value owed to the heat transferred from the energy storage to the temperature sensor during recharging.
  • the rechargeable energy storage of the portable electronic device may, for example, be a rechargeable battery which supplies energy consuming components of the portable electronic device with electrical energy.
  • a recharging detector it can be detected if the energy storage is in a process of being recharged.
  • Such recharging detector may in one embodiment include a mechanical recharging detector for detecting if a socket of the portable electronic device is connected to a charging cable. Whenever a charging cable is plugged into the socket the portable electronic device is thereby connected to a main supply for charging the rechargeable energy storage.
  • This recharging detector hence, may detect a mechanical plug.
  • the recharging detector may detect if current is supplied from the socket to the energy storage.
  • the recharging detector may monitor a capacity, or more generally a charging level of the rechargeable energy storage and derive herefrom if the energy storage currently is charged.
  • the recharge process may be detected in case of a sufficient change in the charging level, and specifically from an upward change in the charging level.
  • the detector may monitor a charging voltage of the battery and derive if the energy storage currently is recharged.
  • the recharge process may be from a change in the charging voltage and specifically from an upward change in the charging voltage.
  • the charging current itself may be measured. In case the charging current deviates from zero a current recharge process is detected.
  • the compensated ambient temperature preferably is determined not only dependent on the sensed ambient temperature and possibly compensation parameters representing a heat impact from heat sources in the portable electronic device other than the energy storage, but also dependent on information related to a charging current for recharging the energy storage, and/or the sensed temperature of the energy storage respectively.
  • this recharge process preferably is reflected by corresponding parameters in the compensation of the sensed temperature signal dependent on information related to the charging current and/or the sensed temperature of the energy storage respectively.
  • the compensation is not terminated upon the detection of a termination of the recharge process but continues in view of the heat generated throughout the recharge process requiring some time to dissipate during which time this heat still perturbs the sensing of the ambient temperature.
  • the information related to the charging current represents the charging current itself.
  • the ambient temperature preferably is determined solely dependent on the sensed ambient temperature and possibly compensation parameters representing a heat impact from heat sources in the portable electronic device other than the energy storage.
  • the recharge based compensation in response to the detection of the recharge process may be activated under the assumption it was not applied so far. In response to the detection of an absence of a recharge process, the recharge based compensation may be deactivated under the assumption it was active so far. In an alternative embodiment, however, the recharge based compensation may not actively be activated or deactivated but may permanently contribute to the compensation model. In this example, the ambient temperature permanently is calculated dependent on the charging current which charging current is zero or around zero in the absence of a recharge process and thus does not contribute to the compensation. Even if in this latter embodiment there may be no explicit recharge detection, the recharge detection still is implied given that the charging current is zero in the absence of a recharge process and is non-zero in the presence of a recharge process.
  • the charging current is not explicitly measured. Still the compensation is desired to be made dependent on the charging current given that the charging current is a measure for the heat released during the recharge process. Hence, in such situations it is preferred that the charging current is not measured but is determined subject to other information available. Such other information may, for example, be a nominal charging current value which may be supplied by a recharger. This nominal charging current value indicates a charging current that typically is provided by the recharger. In one embodiment, this nominal charging current value may be used for the compensation.
  • the nominal charging current value may only reflect or come close to the real charging current as long as the energy storage is not fully charged.
  • a drop of the charging current may be owed to a corresponding control in the recharger which controls the charging current down dependent on the charging level or given that at already high charging levels the energy storage no longer is capable of storing load of additional energy and rather would this oversupplied electrical energy into heat which may damage the energy storage.
  • the charging level of the energy storage on the other hand is readily available e.g. from an operating system of the portable electronic device or from the energy storage itself. Most of todays portable electronic devices provide a charging level indicator displayed to the user in order to warn the user of a flat battery and encourage the user to recharge the device early on.
  • the charging current typically is not measured but is preferably set to the nominal charging current value if the charging level of the energy storage is below a threshold which threshold preferably coincides with a threshold of the recharger for starting reducing the charging current.
  • the threshold is met or exceeded by the charging level—which implies that the nominal charging current value no longer reflects the real charging current—, it is preferred that the charging current is set to a value less than the nominal charging current value.
  • the determined charging current is set to a value derived from a charging current versus charging level characteristic.
  • a charging current versus charging level characteristic may be stored in the device itself and initially be provided by the recharger supplier or be generated by way of measurements.
  • the charging current is rather determined by means of related information than being directly measured.
  • These embodiments may be modified by replacing the charging level by a charging voltage that may be measured, for example.
  • the charging level of the energy storage is derived from the charging voltage, e.g. the voltage of the battery, this measure may be taken alternatively to the charging level.
  • the charging current over charging voltage characteristic may assumed to be similar to the characteristic of the charging current over charging level. I.e., the charging current is assumed to be constant for low charging voltages and drops for higher charging voltages.
  • the charging current is directly measured, the measured charging current may be used as information impacting the compensation of the sensed ambient temperature.
  • components representing heat sources may be considered in the compensation of the sensed temperature.
  • Such components may include one or more of the following:
  • a display of the portable electronic device wherein power consumption related information of the display may be used for the compensation
  • a central processing unit of the portable electronic device wherein power consumption related information such as a load of the central processing unit may be used for the compensation;
  • a GPS module of the portable electronic device wherein power consumption related information of the GPS module may be used for the compensation.
  • a selection of components which contribute to the compensation may depend on the heat generated in absolute terms or in relative terms.
  • the compensated ambient temperature may also be determined based on a thermal conductivity of a heat path between the energy storage and the temperature sensor, and/or between other components contributing to the compensation and the temperature sensor if any. This measure may make the determination of the compensated ambient temperature even more precise since it takes into account the heat flux that effectively arrives at the temperature sensor rather than the bare heat that is generated at the energy storage or other component respectively.
  • the compensated ambient temperature may additionally be determined based on a thermal capacity of one or more of thermal capacitances in the portable electronic device.
  • thermal capacitance may be represented by any element of the portable electronic device being capable of storing thermal energy.
  • a housing of the portable electronic device or parts thereof may be considered as a thermal capacitance.
  • the thermal capacitance does not necessarily consume electrical power but may be heated by components which consume electrical power.
  • the thermal capacitance may store the supplied thermal energy over some time.
  • Such heat may be transferred to the temperature sensor via a thermal conducting path especially when the temperature at the temperature sensor is lower than the temperature of the thermal capacitance.
  • it is only the major thermal capacitances that are taken into account for determining the compensated ambient temperature.
  • a sensed temperature of at least one further temperature sensor, or a sensor allowing for determining a temperature, such as a thermal flux sensor, arranged in the device may be used for determining the compensated ambient temperature, especially when such temperature sensor is available in the device anyway.
  • a temperature sensor may include a temperature sensor that is arranged in the portable electronic device for measuring the temperature at a specific location, or the temperature of a specific component, such as, for example, a central processing unit of the device.
  • frequency contributions in the sensed ambient temperature with a frequency f>0 Hz are adjusted dependent on the sensed ambient temperature (T S ). This feature may be applied for accelerating the determination of the compensated ambient temperature.
  • the portable electronic device may be one of a mobile phone, and especially a smart phone, a handheld computer, an electronic reader, a tablet computer, a game controller, a pointing device, a photo or a video camera, a computer peripheral, a digital music player, a wrist watch, a key fob, a head set.
  • a mobile phone and especially a smart phone, a handheld computer, an electronic reader, a tablet computer, a game controller, a pointing device, a photo or a video camera, a computer peripheral, a digital music player, a wrist watch, a key fob, a head set.
  • a computer program element for operating a portable electronic device, which computer program element, which preferably is stored on a computer storage medium, comprises computer program code means for receiving a signal representing an ambient temperature of the portable electronic device sensed by a temperature sensor of the portable electronic device, and for receiving information if a rechargeable energy storage of the portable electronic device is in a process of being recharged. If the energy storage is detected to be in a process of being recharged a compensated ambient temperature is determined dependent on at least the sensed ambient temperature and dependent on information related to a charging current for recharging the energy storage.
  • a computer program element for operating a portable electronic device, which computer program element, which preferably is stored on a computer storage medium, comprises computer program code means for receiving a signal representing an ambient temperature of the portable electronic device sensed by a temperature sensor of the portable electronic device, and for receiving a signal representing a temperature of a rechargeable energy storage of the portable electronic device sensed by means of another temperature sensor. If the energy storage is detected to be in a process of being recharged a compensated ambient temperature is determined dependent on at least the sensed ambient temperature and dependent on the sensed energy storage temperature.
  • the temperature sensor may in an alternative not be provided and/or arranged for sensing the ambient temperature but may be provided and/or arranged for sensing a temperature of a component of the device or of a location within the device. Again, heat generated by (other) components may impact such measurement.
  • a compensator is provided for determining a compensated temperature dependent on at least the sensed temperature and information related to the electrical power consumed by at least one of the (other) components.
  • FIG. 1 illustrates a mobile phone according to an embodiment of the present invention in diagram a), an associated thermal block diagram in diagram b), and an associate compensator in diagram c),
  • FIG. 2 shows a chart of different temperature signals over time illustrating the compensating effect according to embodiments of the present invention
  • FIG. 3 shows a flow chart of a method for operating a portable electronic device according to an embodiment of the present invention
  • FIG. 4 shows a block diagram of a portable electronic device according to an embodiment of the present invention.
  • FIG. 1 a shows a diagram illustrating a mobile phone according to an embodiment of the present invention.
  • the mobile phone includes a temperature sensor 1 , an energy storage 22 and a central processing unit 23 and a display.
  • One or more of these components 21 , 22 , 23 may radiate heat during operation of the mobile phone amongst other components.
  • the temperature sensor 1 which for example may be one of a commercially available sensor from SensirionTM AG under the tradenames SHTC1 (temperature and humidity sensor) or STS21 (as temperature only sensor), provides a sensed ambient temperature T S .
  • the sensed ambient temperature T S may not reflect the real ambient temperature T R because of a self-heating of the energy storage 22 during recharge which perturbs the measuring with the temperature sensor 1 .
  • Another reason may be a slow dynamic that slows down a temperature response of the temperature sensor 1 when the real ambient temperature T R changes quickly.
  • thermoelectric block diagram of the mobile phone of diagram 1 a is shown diagram 1 b ).
  • the heat generating components 21 , 22 , 23 are thermally connected to the temperature sensor 1 and possibly to each other by heat paths HP on which heat flux is propagated.
  • a heat flux propagating to the temperature sensor 1 may be determined and be compensated for by a compensator 4 as is shown in diagram 1 c ).
  • the compensator 4 may be an entity, represented by hardware, software, or a combination of both, which receives at least the sensed ambient temperature T S , and a determined charging current I in the case of a recharge process detected.
  • the compensation may receive information P 1 , P 2 related to the power consumption of the other components 21 and 23 .
  • the compensator 4 supplies at its output the compensated ambient temperature T A .
  • the compensator 4 may make use of a dynamic thermal model of the mobile device such as, for example, is shown in diagram 1 b ).
  • the dynamic thermal model may mathematically be described by a differential equation system.
  • the model may in one embodiment comprise one or more, and preferably the most relevant heat sources, and in another embodiment additionally one or more, and preferably the most relevant thermal conductivities, and in another embodiment additionally one or more, and preferably the most relevant heat capacities, as well as it comprises the temperature sensor that is well coupled to the ambient, and it may comprise one or more optional temperature sensors that may be available in the mobile device.
  • the compensated ambient temperature T A may then be estimated from these inputs by using the following Equation 1) as compensator 4 :
  • A is an n-by-n matrix
  • B an n-by-m matrix
  • C an 1-by-n matrix
  • D an 1-by-m matrix
  • n is the number of states that depends on the complexity of the model and m the number of inputs.
  • Typical inputs may be, for example, an intensity of a display, a time derivative of a battery charge level, a central processing unit load, or other power management information. Additional temperature sensors at hot spots of the portable electronic device may improve the compensation results.
  • the portable electronic device is modelled as a thermal system with heat sources, and optionally with heat capacities and/or thermal conductivities. From this model, a time-discrete compensator according to the state space description of Equation 1) is derived, that can easily be implemented on a microprocessor of the portable electronic device by using the following software code:
  • the compensated ambient temperature T A may be displayed on the display 21 .
  • another temperature sensor 3 may be provided which other temperature sensor 3 may act as a sensor for sensing the temperature T 1 of the energy storage 22 .
  • the compensator 4 may determine the ambient temperature T A at least dependent on the sensed ambient temperature T S and the sensed temperature T 1 .
  • a sample real temperature characteristic T R in the ambient of a portable electronic device is shown by the straight line.
  • the dashed line represents a corresponding ambient temperature T S as sensed by a temperature sensor of the mobile device. It becomes apparent from the chart in FIG. 2 that due to internal heating the temperature sensor detects an ambient temperature T S higher than the real ambient temperature T R .
  • Interval I 1 may, for example, represent a time interval, in which the mobile device is operated at average load. However, in interval I 2 , it assumed that a battery of the mobile device at least temporarily is recharged.
  • the real ambient temperature T R drops, for example, due to the user of the mobile device entering a basement.
  • the sensed ambient temperature T S follows a temperature drop in the real ambient temperature T R only slowly.
  • the dashed-dotted line illustrates a compensated ambient temperature T A which is determined by using a compensator such as illustrated in diagram 1 c ), which is based on a thermal model of the portable electronic device. It can be seen, that from the beginning of the operation of the portable electronic device, a deviation of the compensated ambient temperature T A from the real ambient temperature T R is minimized, at least the compensated ambient temperature T A is lower than the sensed ambient temperature T S .
  • the compensated ambient temperature T A much quicker aligns with the drop in the real ambient temperature T R .
  • This effect may be caused by implementing a temperature dependent compensation of dynamic contributions of the sensed ambient temperature T S in the compensator.
  • a dynamic contribution is understood as any contribution in the spectral range with a frequency f>0 Hz.
  • the compensator is enabled to accelerate the thermal dynamics of the mobile device such that the compensated ambient temperature T A responds faster to changes in the real ambient temperature T R , and consequently in the sensed ambient temperature T S .
  • temperature dependent compensation of the dynamics of the sensed ambient temperature signal it is referred to US Patent Publication US 2011/0307208.
  • FIG. 3 illustrates a flow chart of a method for operating a portable electronic device according to an embodiment of the present invention.
  • step S 1 the device is switched on.
  • step S 2 an ambient temperature is measured.
  • step S 3 it is verified if a battery of the device is in a process of being recharged. If no such recharge process is detected (N), in step S 4 a compensated ambient temperature is calculated dependent on the sensed ambient temperature, and potentially compensated for heat propagated to the temperature sensor from components other than the energy storage.
  • step S 5 the compensated ambient temperature is displayed to the user on a display of the device.
  • step S 6 a compensated ambient temperature is calculated dependent on the sensed ambient temperature and at least further dependent on a nominal charging current value and a charging level or charging voltage of the energy storage.
  • the sensed temperature may also here additionally be compensated for heat propagated to the temperature sensor from components other than the energy storage.
  • step S 7 the compensated ambient temperature is displayed to the user on the display.
  • FIG. 4 shows a schematic hardware oriented block diagram of a portable electronic device 2 according to an embodiment of the present invention.
  • a central processing unit 23 in form of a microprocessor is connected via electrical conductors 27 to a temperature sensor 1 and other sensors.
  • a wireless interface 25 is connected to the microprocessor, too.
  • a socket 26 for receiving a charging cable is connected to a rechargeable battery 22 . Whenever a charging cable is plugged into the socket 26 and the portable electronic device 2 is thereby connected to a main supply the rechargeable battery 22 will be charged.
  • a recharging process detector 28 is provided for detecting a recharge process.
  • the detector 28 may, for example, detect if a charging cable is plugged into the socket 26 and as such detect a mechanical plug. In another variant, the detector 28 may detect if current is supplied from the socket 26 to the rechargeable battery 22 . In another variant, the detector 28 may monitor a capacity, or more generally a charging level of the rechargeable battery 2 and derive from this state if the rechargeable battery 2 currently is charged. Any such indicator as to the detection of a charging process is submitted to the central processing unit 23 as is the charging level of the battery 22 . In addition, the charging process detector 28 may supply a nominal charging current value to the central processing unit 23 received by a recharger plugged into the socket 26 .
  • the central processing unit 23 analyzes the signals supplied by the temperature sensor 1 and the recharging process detector 78 by executing a corresponding routine.
  • the routine which is also denoted as compensator is stored in a memory 29 connected to the central processing unit 23 via a bus system 24 .

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Telephone Function (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Power Sources (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transceivers (AREA)
US14/410,963 2012-07-02 2013-04-18 Method for operating a portable electronic device Abandoned US20150349570A1 (en)

Applications Claiming Priority (3)

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EP12004897.0 2012-07-02
EP12004897.0A EP2682715B1 (en) 2012-07-02 2012-07-02 Portable electronic device
PCT/CH2013/000064 WO2014005234A1 (en) 2012-07-02 2013-04-18 Method for operating a portable electronic device

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CN (2) CN104662391B (zh)
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