CN1361464A - Advanced closed ring heat management - Google Patents
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- CN1361464A CN1361464A CN 00136915 CN00136915A CN1361464A CN 1361464 A CN1361464 A CN 1361464A CN 00136915 CN00136915 CN 00136915 CN 00136915 A CN00136915 A CN 00136915A CN 1361464 A CN1361464 A CN 1361464A
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- 238000012544 monitoring process Methods 0.000 claims description 16
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- 238000013500 data storage Methods 0.000 claims 2
- 238000005265 energy consumption Methods 0.000 abstract 1
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- 210000003127 knee Anatomy 0.000 description 9
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Abstract
The heat management in some electric system needs to monitor the electric energy consumption and temperature inside the system at times. Thus obtained power consumption and temperature data permit to establish system heat model in relevant time. After the system heat model is established, the model as well as the measured present power consumption and temperature of the system are used in predicting the heat tendency of the system. Then, the obtained system heat tendency is used in temperature control of the electric system.
Description
The present invention relates generally to the heat management of system, more particularly, relate to the control of advanced closed ring system temperature.
The performance of current various dissimilar systems, the performance-critical ground of the portable system of particularly on knee or notebook and so on depend on and effectively utilize the system operation electric energy, for example can be stored in the electric energy in the rechargeable battery.In order to prolong as much as possible that on knee and notebook can be operated and time that needn't charge the battery again, existing on knee and notebook generally all has several power operation patterns.Usually these devices can be de-energized, thereby the CPU (central processing unit) (" CPU ") that is included on knee or the notebook is almost completely closed, and the state of CPU is stored on the hard disk drive.For recovery operation, generally be that an extremely low electric energy part or the auxiliary circuit (for example, keyboard controller) of CPU responds pressing of key.Then, the system restart normal power source so that CPU can search for the machine state of storage from hard disk drive, thereby returns to operator scheme to computing machine.Some known battery saving modes are called as sleep pattern, park mode, or the like.
In order to implement the conversion between the different operation modes, the power management routine (" PMR ") that CPU carries out periodically monitors peripherals, to estimate the operation that whether can suspend a peripherals.Equally, insert a peripherals that has been suspended operation if desired, PMR must return to mode of operation to peripherals.
Not only design on knee or there is above-mentioned electric energy management problem in notebook, and the size of the compactness of on knee and notebook, encapsulation and limited ventilation unit also bring problem to heat management closely.In order to realize initiatively, rather than it is passive, heat management, on knee and notebook generally includes one or more equipment that are used for the temperature of the various system components of sensing, and one or more can respond sensed temperature and start Temperature-controlled appliance with the temperature that changes assembly such as electric heater or fan.The compared computer program PMR that CPU carries out, or the comparable system hardware components temperature in the surveillance periodically suitably start or the closing temperature opertaing device then.
Be readily appreciated that higher the operating performance on knee or portable system that notebook is such is accompanied by usually that corresponding heat produces in the power consumption of increase and the system.But,, thereby become the key that system operation performance and/or electric energy are preserved target at the needs of certain point control system temperature because the operation of the system component of key is broken down when exceeding certain predetermined temperature range.Therefore, in order to obtain high operating performance, there is the choice between system performance, battery-powered operation duration and the system temperature in the battery-powered portable system.
Be used for the operating performance that balance improves, the battery-powered operation of length, and the Existing policies of the rival demand between the system temperature just starts one or more Temperature-controlled appliances simply, for example, the temperature that measures a system component has surpassed certain preset range, starts fan or well heater.A difficulty of the thermal management policy before utilizing is the size of the heat protection surplus of critical system assembly.Owing to be included in temperature sensing device in the system, for example, thermistor is not positioned at place, hot generation source, also because the encapsulation of each assembly, the rising on the system component temperature or reduce with corresponding sensing equipment temperature on rising and reduce between the existence hysteresis.Similarly, lagging behind also occurs in the start-up temperature opertaing device, for example starts fan or well heater, and in the system component between the temperature change.
As a result, if can predict the hot trend of a system component or total system, in order to guarantee that enough heat protection surplus need be at the Temperature-controlled appliance that starts this system component on a farther temperature of the assembly temperature boundary of this assembly actual needs.Say with putting into practice language, guarantee enough heat protection surpluses in order to utilize above-mentioned strategy, because need be at the temperature actuated Temperature-controlled appliance away from the system component temperature limit of actual needs, thereby the waste electric energy.In addition, not that to start electronic cooling device when really needing be dual waste, because its operation consumed power not only, and its operation also produces extra heat in system.In addition, existing thermal management policy is owing to need the temperature sensing device of extra quantity, and the thermal control equipment of the temperature actuated Temperature-controlled appliance of Temperature-controlled appliance and response sensing equipment also may improve system's manufacturing cost.
The invention provides a kind of improvement strategy of system thermal management, the electric energy that it has reduced the consumption of system temperature opertaing device has guaranteed the operability of system simultaneously.
An object of the present invention is to reduce the required heat protection surplus of system component and do not increase possibility because the system that operates in outside the predetermined temperature range breaks down.
Another object of the present invention is to reduce the unnecessary power consumption of system.
A further object of the present invention is to want can realize using the system architecture of more simplifying of heat management.
Say that briefly the present invention is a kind of thermal management algorithm in a power driven system in one embodiment.The realization of method needs interior power consumption and the temperature of monitoring system every now and then.The power consumption of obtaining like this can be set up system's thermal model of a relevant time with temperature data.After having set up system's thermal model, the power consumption of model and current sensing and system temperature together are used for the hot trend of prognoses system.Then the pre-calorimetric trend of the system of acquisition like this is used to implement temperature control strategy in the power driven system.
, be familiar with those of ordinary skill in the art and will be understood that or understand these and other feature, purpose and advantage of the present invention the DETAILED DESCRIPTION OF THE PREFERRED shown in each accompanying drawing by following.
Fig. 1 be an example that is applicable to according to the present invention operation can battery-powered system block scheme;
Fig. 2 be explanation after the system operation configuration change example can battery-powered system in the curve map of possible hot trend;
Fig. 3 is explanation during can battery-powered system operation, sets up the synoptic diagram of set of the temperature history data set of system's thermal model for the configuration of the different operating under various environment temperatures being used to of collecting; With
Fig. 4 is the synoptic diagram that is illustrated as time-thermograph of one type of temperature history data aggregation.
Fig. 1 shows that a total sequence number 20 of usefulness that is applicable to according to the present invention operation represents can be battery-powered the example of on knee or notebook portable computer system.The portable computer system 20 of example comprises various system components commonly used, for example, random access memory (" RAM ") 21, CPU 22, core logic IC 23, the back of the body is according to LCD (" LCD ") 24, PC card controller 26, hard disk 28, CD-ROM drive 32 and floppy disk 34.PC card controller 26 is connected to one and is applicable to the PC card socket 36 of accepting PC card 38.Those skilled in the art readily appreciate that, have omitted the required various electrical connections of portable computer system 20 overall operations that exist between the system component 21-38 for convenience of explanation in Fig. 1.
The operation of each system component 21-38 is regulated power lead 44 by a power supply through direct current (" DC ") electric energy is provided.Regulate power lead 44 and be coupled to the output terminal of a width modulation (" PWM ") compensating direct current to direct current (" DC-DC ") converter 52 through a current sense resistance 54.The input end of DC-DC converter 52 receives electric energy through an input power cord 56 that is connected to power selection switch 58a-58c.Power selection switch 58a-58c can start independently, selects in the various power supplys, to be coupled to input power cord 56 by one among several protection diode 62a-c respectively.In example embodiment shown in Figure 1, the power supply of portable computer system 20 comprises a pair of battery 64a and 64b, exchanges AC-DC (" the AC-DC ") converter 66 that (" AC ") plug 68 receives electric energy with one through one.
As mentioned above, in order to save electric energy, particularly at the electric energy when portable computer system 20 provides the electric energy operation by battery 64a and 64b, the PMR that CPU carries out is monitor system components 21-38 periodically, whether can suspend the operation of a particular system components with assessment.Equally, if the execution of a computer program need insert the system component of a pausing operation, PMR must make this component recovery to mode of operation.Therefore, the energising amount of each system component 21-38 according to the action need of response portable computer system 20, the heat that produces in overregulating electric flux that power lead 44 provides and each system component 21-38 for electric energy is provided in the operation of giving portable computer system 20 changes every now and then.
DC-DC converter 52 comprises a tandem tap 72, and it has a source electrode 72s who receives electric energy from input power cord 56.As shown in fig. 1, tandem tap 72 a P-type metal oxide semiconductor field effect transistor (MOSFET) preferably.Be provided to from DC-DC converter controller 78 through pwm signal line 76 tandem tap 72 grid 72g PWM electric signal 74 repeatedly at first conducting then by tandem tap 72.Electric power is provided for the operation of DC-DC converter controller 78 from the electric energy that input power cord 56 receives, DC-DC converter controller 78 manufactures an integrated circuit (" IC ") usually.
In DC-DC converter 52, the drain electrode 72d of tandem tap 72 is connected to inductor 82.In the consecutive intervals of each tandem tap 72 conducting, the electric current that flows into inductor 82 from drain electrode 72d increases, and ends up to tandem tap 72.In the consecutive intervals that each tandem tap 72 ends, the electric current that flows through inductor 82 reduces, and stops to flow through inductor 82 up to electric current, or up to tandem tap 72 conducting once more.
When tandem tap 72 conductings, some electric currents that flow through inductor 82 enter a filter capacitor 84.When tandem tap 72 ended, electric current flowed out filter capacitor 84.In consecutive intervals, when the electric current by inductor 82 reduced, electric current was connected the drain electrode 72d of tandem tap 72 and the 86 inflow inductors 82 of free break-in (free-wheeling) diode between the circuit ground from one at each tandem tap 72.
The input end of DC-DC converter controller 78 receives and passes through IP signal wire 92 and IM signal wire 94 IP signal and the IM signal from the opposite end of current sense resistance 54 respectively.Voltage difference between IP and the IM signal with provide the electric current of operational power to be directly proportional for portable computer system 20 through overregulating power lead 44.In order to provide the electric energy of well-tuned through overregulating power lead 44 to system component 21-38, DC-DC converter controller 78 response DC-DC converter controllers 78 from the voltage that current sense resistance 54 receives, change the characteristic of PWM electric signal through IM signal wires 94.Damage DC-DC converter 52 in order to prevent the electricity overload that short circuit or portable computer system 20 inner assembly faults may cause, the signal that DC-DC converter controller 78 response DC-DC converter controllers 78 process IP signal wires 92 and IM signal wire 94 receive from current sense resistance 54, and restriction DC-DC converter 52 is supplied with the maximum current of regulating power lead 44.
So far Shuo Ming portable computer system 20 is conventional system fully.But according to the present invention, portable computer system 20 also comprises a thermal management controller 102.Similar to DC-DC converter controller 78, the thermal management controller 102 shown in Fig. 1 receives PWM electric signal 74 and receives IP signal and IM signal through IP signal 92 and IM signal wire 94 through pwm signal line 76 respectively.The signal that is provided to thermal management controller 102 through IP signal wire 92 and IM signal wire 94 makes it possible to sensing and is present in the electric current that the voltage regulated on the power lead 44 and DC-DC converter 52 are provided to system component 21-38.Therefore, thermal management controller 102 can both directly be determined the amount of the electric energy that system component 21-38 consumes at any time.Fig. 1 also is described as direct sensing to thermal management controller 102 and is present in pwm signal on the inductor 82.Be present in pwm signal on the inductor 82 and be present in the data of regulating the voltage on the power lead 44 with indication and together receive, make thermal management controller 102 can determine to be provided to the amount of electric current and the electric energy of system component 21-38 at any time indirectly.As a result, any with this dual mode, thermal management controller 102 can detect the corresponding heats that produce in power consumption and the portable computer system 20 every now and then.In addition, thermal management controller 102 comprises a temperature sensor 104, and for example, the embedded thermal sensor of diode and so on, or the thermistor of an outside are used in portable computer system 20 sensing environment temperatures.
Although do not illustrate among Fig. 1, if portable computer system 20 is to provide electric power by the electric energy that AC-DC converter 66 provides, thermal management controller 102 is the proper signal that receives from AC-DC converter 66 of sensing mainly, with the amount of electric current and the electric energy of determining to be provided to system component 21-38 at any time indirectly.But, had better not select for use from AC-DC converter 66 and provide signal to thermal management controller 102, because this will make portable computer system 20 also must carry out a kind of supplementary technology in electric energy operating period of using battery 64a and 64b to provide, with the amount of electric current and the electric energy of determining to be provided to system component 21-38.
As shown in fig. 1, portable computer system 20 also comprises a thermistor 106 that is close to CPU in the drawings.Thermistor 106 is connected to thermal management controller 102, thereby makes thermal management controller 102 can monitor the temperature around the thermistor 106 in the portable computer system 20 every now and then.
During the normal running of portable computer system 20, thermal management controller 102 is monitored ad-hoc locations in electric energy that portable computer system 20 consumes and the portable computer system 20 every now and then, and for example, CPU 22, temperature.Each thermal management controller 102 monitors the power consumption and the temperature of portable computer system 20, also by obtain the data of relevant portable computer system 20 modes of operation from PMR, thermal management controller 102 can be tabulated the temperature history data, and be kept in the permanent storage of hard disk 28 and so on, for example shown in the table 1 of operating conditionss in the record portable computer system 20.
| The heat dissipation data | The amount of measuring | |
| Power consumption | The X watt | |
| The temperature of | ????t 1℃ | |
| ?????…… | ????…… | |
| The temperature of position n | ????t n℃ | |
| Environment temperature | ????t n℃ | |
| System component | Mode of operation | |
| ??CPU?22 | Open-minded | Open or turn-off |
| Sleep | Open or turn-off | |
| Suspend | Open or turn-off | |
| ????LCD?24 | Open or turn-off | |
| | Open or turn-off | |
| | Open or turn-off | |
| CD- | Open or turn-off | |
| | Open or turn-off | |
Table 1
During normal running, thermal management controller 102 can be analyzed the set of such temperature history data of collecting in a period of time, therefrom to set up the thermal model of portable computer system 20.Then, thermal management controller 102 can use the thermal model of such foundation, the hot trend that may exist during 20 subsequent operations of prediction portable computer system.Then, the computer program that CPU 22 carries out such as, PMR, can utilize the hot trend of prediction to implement temperature control strategy in the portable computer system 20, for example, sends an order to thermal management controller 102, starts fan 108 cooling CPU 22.
Fig. 2 shows after the change of the operative configuration of system, for example starts or stops hard disk 28 or is included in after any other assembly in the portable computer system 20, and two (2) plant possible hot trend in the portable computer system 20.In the figure, the environment temperatures in the portable computer system 20 increase along the perpendicular line in figure left side, and the time increases to the right side level from the left side of figure.
Shown in curve 112a and 112b among Fig. 2, suppose that the environment temperature in the portable computer system 20 has reached balance, temperature not will begin in a minute and raises or reduction after and then an assembly was opened or closed in time=0.0.But begin to change in the operative configuration of portable computer system 20, through a retardation time at interval after, temperature only has very little variation in this time interval.The time interval that produces this hysteresis is because the sources that produce of the heat in the portable computer system 20 normally are enclosed in certain encapsulation, and encapsulation has thermal mass, and machinery and heat is produced the source on heating power ground and portable computer system 20 interior environment completely cut off.Only after heat generation source was heated or cooled off encapsulation, heating or cooling just tended to change the temperature on every side in the portable computer system 20.Temperature heating in encapsulating material or when turning cold, retardation time at interval after---its duration is depended on the thermal insulating properties of encapsulation to a great extent, thermogenetic increase or reduce beginning and promptly change environment temperature in the portable computer system 20.Rise or reduce in certain environment temperature than after the time interval faster, time=the t environment temperature reaches balance again.If the operative configuration of system turns back to the configuration of time=0.0 o'clock at any time, pass through certain time interval so, the environment temperatures in the portable computer system 20 turn back to the temperature of time=0.0 o'clock, shown in curve 114a and 114b among Fig. 2.
Consider the curve 112a among Fig. 2,112b, 114a and 114b, be readily understood that, words under all operations condition, so under most of operating conditionss, after the variation that increases power consumption and improve the operative configuration of environment temperature undoubtedly over time takes place, increase immediately and cool off, will waste electric energy.For example, if increase power consumption and thereby the operative configuration that improves environment temperature the most at last continue the enough short time interval, to such an extent as to so the change that the raising of environment temperature may very little cooling strategy less than assurance.
In contrast, if the change of the operative configuration of portable computer system 20 reduced power consumption and thereby cause lower environment temperature the most at last, reduce so immediately the cooling may reduce power consumption.Reducing to cool off after power consumption reduces may be the best strategy of saving electric energy, may ultimate demand increase cooling a period of time even be stored at the interior latent heat of assembly, be lower than the predetermined maximum allowable temperature of indicating as Fig. 2 dashed middle line 116 to keep environment temperature.
Fig. 3 shows under various environment temperatures, that is, and and t
1, t
2... t
n, the various operative configuration for portable computer system 20 promptly dispose 1,2 ... n, the set of temperature history data 222 collection of collection.For the system shown in the previous table 1, have seven (7) to plant different system components, they can be one or another kind of in the states in two (2) at any time,, open (on) state or shutoff (off) state that is.For portable computer system 20, exist more than 2 in theory
nPlant different operative configuration, for example, 2
7But in fact the operative configuration of Cun Zaiing is less than 2 greatly
nKind because for example, when only the state as CPU 22 was " open-minded ", LCD 24, PC card controller 26, hard disk 28, or the like just may be in " open-minded " state rightly.
Collected at portable computer system 20 before the temperature history data 222 of the quantity of enough setting up thermal model, when portable computer system 20 operates in any specific configuration, will be such as the dsc data of listing in the table 1 to enter this operative configuration interval " Time seclected time afterwards
i" collect continuously and be kept in the suitable temperature history data 222 that illustrate in more detail among Fig. 4.Because temperature changes after changing configuration probably soon, the back last very long takes place in this incident, so the time interval " Time
i" duration after and then changing operative configuration preferably at interval near, and it is more longer at interval in the time back to take place, for example, logarithm at interval.Be kept at data in each temperature history data 222 and comprise at that time and whole portable computer system 20 each positions 1,2 ... the temperature of n and operate in temperature control strategy in the portable computer system 20.As point out among Fig. 3 with foregoing, except different temperatures historical data 222 collection of collecting every kind of configuration, also preserve different environment temperatures, that is, t
1, t
2T
n, temperature history data set 222, environment temperature preferably equably at interval, for example, 5.0 ℃ or 2.0 ℃.
Because a particular ambient temperature t
iA customized configuration
i Temperature history data 222 will be according to preceding a kind of configuration change, from operative configuration
xEnter operative configuration
iCollected the independently temperature history data 222a-222g shown in Fig. 3 afterwards.For example, if configuration in front
xMiddle hard disk 28 is to open or off state, is entering a specific operation configuration
iAfterwards, for example, after floppy disk 34 operations, the temperature history data 222 of collection will be affirmed difference.Collected sufficient amount a particular ambient temperature t
jFrom configuration
xVarious configurations after the transition
i Temperature history data 222 after, portable computer system 20 can be with the data of collecting like this as a thermal model, so that portable computer system 20 temperature t around
iLeave configuration
xBegin to operate in configuration
iThe time, the hot trend of using in the prediction enforcement temperature control strategy.The collection of initial temperature history data 222 can be carried out between factory's aging period of the portable computer system 20 after the final assembling.This test is to guarantee that according to a kind of all configuration transition all are that the appropriate algorithm of operating carries out.
A kind of conservative thermal management policy regulation, if in serviceability temperature historical data 222 as portable computer system 20 temperature t around
jEnter configuration
iAfter a special time Time
kImplement the thermal model of temperature control strategy, in the position
iWhen the temperature of measuring is higher than the temperature of this position of storage in the corresponding temperature history data 222, so higher measurement temperature is stored in the temperature history data 222, substitutes lower temperature.Change a kind of saying, adopt a kind of so conservative thermal management policy regulation, at Time
kThe lower temperature of measuring never stores into to substitute in the temperature history data 222 and is stored in one of them higher temperature value.
In the example of Fig. 1, thermal management controller 102 is to hint that with a kind of it is that the mode that realizes illustrates fully in the hardware of IC and so on.According to the realization details that can change between different system designs, thermal management controller 102 is preferably realized by a computer program combined I C who carries out with the CPU that is included in the portable computer system 20.Specifically, it seems the software section that comprises a thermal management controller 102 among the PMR that is preferably in portable computer system 20.In addition, being used to of illustrating previously collects temperature history data 222 and is exemplary by its strategy of setting up a thermal management policy.Be used to collect the exact method of temperature history data 222 and the accurate thermal operating strategy of use may depend on the unique property that can use various different power driven systems of the present invention.
Although it is exemplary purely openly that the root invention according to the currently preferred embodiment explanation, is to be understood that this, and should not be interpreted as limitation of the present invention.Therefore, after reading above-mentioned explanation, those skilled in the art will know various the substituting of the spirit and scope of the present invention that do not break away from of the present invention undoubtedly, revise, and/or alternate application.Therefore, following claim will be interpreted as comprising that all that fall in true spirit of the present invention and the scope substitute, revise, or alternate application.
Claims (16)
1. thermal management algorithm in power driven system comprises step:
Power consumption in the monitoring system every now and then;
Temperature in the monitoring system every now and then;
Power consumption according to monitoring is set up the thermal model of a kind of relevant time of system with system temperature;
Utilize thermal model, the hot trend of the power consumption of current sensing and system temperature prognoses system; With
The pre-calorimetric trend of application system is implemented the temperature control strategy in the power driven system.
2. method according to claim 1, wherein the step of power consumption comprises that direct monitoring offers the electric current of system in the monitoring system.
3. method according to claim 1, wherein the step of power consumption comprises the electric signal of direct monitoring in system provides the energy converter of electric energy in the monitoring system, thereby determines the electric current of the system that offers indirectly.
4. method according to claim 3, wherein electric signal is monitoring in interchange (" the AC ") energy converter in the system of being included in.
5. method according to claim 3, wherein electric signal is monitoring in DC-to-DC (" the DC-DC ") energy converter in the system of being included in.
6. method according to claim 5 further comprises the step that the battery of electric energy from the system of being included in is provided to the DC-DC energy converter.
7. method according to claim 1, wherein the step of temperature comprises that monitoring is included in the voltage at the thermistor two ends in the system in the monitoring system.
8. method according to claim 1, the step of thermal model that wherein produces the relevant time of system comprise in the data storage device of the data storage of thermal modelization in the system of being included in.
9. method according to claim 1, wherein the pre-calorimetric trend of application system comprises the fan of opening in the system of being included in the step of the temperature control strategy of implementation system.
10. a thermal management controller is applicable to and can utilizing thermal model to predict enforcement temperature control strategy in the power driven system of its hot trend, and thermal management controller comprises:
The power consumption testing circuit is used for frequently in the monitoring system power consumption to use in the hot trend of utilizing the thermal model prognoses system;
Temperature sensing circuit, the temperature that is used for monitoring system frequently is to use in the hot trend of utilizing the thermal model prognoses system; With
Temperature-control circuit is used for implementing the temperature control strategy in system.
11. thermal management controller according to claim 10, wherein said power consumption testing circuit are directly monitored the electric current of the system that offers.
12. thermal management controller according to claim 10, wherein said power consumption testing circuit be the electric signal of monitoring in system provides the energy converter of electric energy directly, thereby determine the electric current of the system that offers indirectly.
13. thermal management controller according to claim 12, wherein said electric signal are to monitor in the AC energy converter in the system of being included in.
14. thermal management controller according to claim 12, wherein said electric signal are to monitor in the DC-DC energy converter in the system of being included in.
15. thermal management controller according to claim 10, wherein said temperature sensing circuit monitoring is included in the voltage at the thermistor two ends in the system.
16. thermal management controller according to claim 10, wherein said temperature-control circuit is implemented the temperature control strategy by the fan of opening in the system of being included in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00136915 CN1239980C (en) | 2000-12-28 | 2000-12-28 | Advanced closed ring heat management |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00136915 CN1239980C (en) | 2000-12-28 | 2000-12-28 | Advanced closed ring heat management |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1361464A true CN1361464A (en) | 2002-07-31 |
| CN1239980C CN1239980C (en) | 2006-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00136915 Expired - Fee Related CN1239980C (en) | 2000-12-28 | 2000-12-28 | Advanced closed ring heat management |
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| Country | Link |
|---|---|
| CN (1) | CN1239980C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362726C (en) * | 2004-07-02 | 2008-01-16 | 日本电气株式会社 | Communication terminal and method of controlling heat generation thereof |
| CN101165632B (en) * | 2006-10-18 | 2010-06-02 | 国际商业机器公司 | System and method for predicating power event in intermittent power environment |
| CN102112855A (en) * | 2008-07-30 | 2011-06-29 | 飞思卡尔半导体公司 | Die temperature estimator |
| CN109857228A (en) * | 2018-12-29 | 2019-06-07 | 曙光信息产业(北京)有限公司 | Fan control device and method |
-
2000
- 2000-12-28 CN CN 00136915 patent/CN1239980C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362726C (en) * | 2004-07-02 | 2008-01-16 | 日本电气株式会社 | Communication terminal and method of controlling heat generation thereof |
| US7622896B2 (en) | 2004-07-02 | 2009-11-24 | Nec Corporation | Battery charging control terminal and temperature control terminal |
| CN101165632B (en) * | 2006-10-18 | 2010-06-02 | 国际商业机器公司 | System and method for predicating power event in intermittent power environment |
| CN102112855A (en) * | 2008-07-30 | 2011-06-29 | 飞思卡尔半导体公司 | Die temperature estimator |
| CN102112855B (en) * | 2008-07-30 | 2014-01-29 | 飞思卡尔半导体公司 | Die temperature estimator |
| CN109857228A (en) * | 2018-12-29 | 2019-06-07 | 曙光信息产业(北京)有限公司 | Fan control device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1239980C (en) | 2006-02-01 |
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