Abstract:
An apparatus and method for adaptively changing a constant power level of a system in compliance with a current system specification can improve safety issues such as overheating, due to excess charging capacity. After purchase/after market add-ons to the system made by a customer can change the load such that the present invention adaptively changes the constant power level supplied to match the after initial purchase add-ons. The method includes acquiring system specification information, searching for a constant power level corresponding to the acquired system specification information, and changing a constant power level according to the searched constant power level.

Description:
CLAIM OF PRIORITY 
     This application claims priority under 35 U.S.C. §119(a) from a Korean Patent Application filed in the Korean Intellectual Property Office on Oct. 31, 2008 and assigned Serial No. 10-2008-0107509, the contents of which are herein incorporated by reference in its entirety. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an apparatus and method for adaptively changing a constant power level of a system in compliance with a system specification. More particularly, the present invention relates to an apparatus and method for, to stably supply a constant power of a system power source. 
     2. Description of the Related Art 
     In order to meet consumer demand for ever-faster processing capability in a terminal, such as a notebook computer, manufacturers have instituted changes in hardware such as a Central Processing Unit (CPU), a graphic chipset, a memory, etc. in the same main board. The manufacture of a terminal in compliance with diverse system specifications has been provided to the consumer in an attempt to meet consumer demand. 
     A person of ordinary skill in the art can appreciate that the CPU, graphic chipset, memory, etc. are usually responsible for most of power consumption of in a system for terminals of this type. Depending on a sum of the power consumption by all the items in such terminals, the manufacturer differentially determines a capacity of a power source supplied to each system. Here, the capability of the power source supplied to the system means a capability of an adapter. 
     The manufacturer determines a suitable adapter capability by to provide appropriate resources to several main boards in order to satisfy various system specifications. As a result of such a determination of suitable adapter capability, resultantly, the manufacturer constructs the main board with different variations depending on the adapter capability. 
     For example, if the adapter and a system external power source, simultaneously supplies power to a system and a battery, the adapter will gradually decrease power supplied to the battery at a predetermined power level or more. After that, at a time the power supply to the battery is equal to zero, the adapter supplies power only to the system. Here, the power level at which the power supply to the battery decreases is referred to as a constant power level preset to the system. The adapter has to maintain a constant power of the system according to the constant power level in order to stably supply a power source to the system. 
     In order to maintain a constant power of a system within a main board, a constant power level within the main board has to be set differently depending on the capabilities of an adapter. In the case of a low capability adapter, if a constant power level is too high compared to capability, a safety accident such as adapter overheating, etc. occurs. On the contrary, in the case of a high capability adapter, if a constant power level is too low compared to capability, a problem of an increase of a battery charge time, etc. occurs, thus resulting in user&#39;s dissatisfaction. As such, the constant power level within the main board has to be set differently on a per-adapter-capability basis. Thus, the main board has to be constructed with a number of variations to accommodate the different constant power levels of the various adapter capabilities. If the main board is constructed with a number of variations to due varying adapter capabilities, there is a problem in that improperly combined main boards constitute a system by a management or worker mistake. 
     Also, it can occur that, as a consumers exchange or add, for example a CPU, a graphic chipset, a memory, etc. to the system after purchasing the system, the current system specification becomes different than the previous system specification at the time of original purchase. In this case, because of the improvement of performance of the changed system specification compared to the previous system specification, a system load increases, however, a constant power level set to the system by a manufacturer is kept as it is. If the same constant power level as a previous one is kept despite the increase of the system load as above, because system power and charge power are simultaneously supplied and the system load is high, the system power and charge power can fast exceed a capability of an adapter, thus resulting in overheating, etc. Here, in order to minimize the excess of the adapter capability and prevent the overheating, etc., the charge power has to be decreased through a decrease of the constant power level. In fact, the overheating issue is a potential safety hazard. 
     Thus, there is a need for a scheme that automatically changes a constant power level in compliance with current system specifications, thereby minimizing an excess of a capability of an adapter and preventing overheating, etc. 
     SUMMARY OF THE INVENTION 
     An exemplary aspect of the present invention is to provide an apparatus and method for adaptively changing a constant power level of a system in compliance with a changing system specification. 
     Another exemplary aspect of the present invention is to provide an apparatus and method for, to stably supply a constant power of a system power source, determining a system constant power level in compliance with a system specification and, if a consumer subsequently changes the system specification, automatically changing the constant power level of the system in accordance with the changes made by the consumer. 
     A further exemplary aspect of the present invention is to provide an apparatus and method for determining a load level of a system using system specification information, searching for a constant power level corresponding to the determined load level, and adaptively changing a constant power level of the system. 
     The above exemplary aspects are achieved by providing an apparatus and method for adaptively changing a constant power level of a system in compliance with a system specification. 
     According to one exemplary aspect of the present invention, a method for changing a constant power level of a system is provided. The method includes acquiring system specification information, searching for a constant power level corresponding to the acquired system specification information, and changing a constant power level according to the searched constant power level. 
     According to another exemplary aspect of the present invention, an apparatus for changing a constant power level of a system is provided. The apparatus includes a system specification information acquiring unit, a constant power level searching unit, and a constant power level adaptive changing unit. The system specification information acquiring unit acquires system specification information. The constant power level searching unit searches for a constant power level corresponding to the acquired system specification information. The constant power level adaptive changing unit changes a constant power level according to the searched constant power level. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which: 
         FIG. 1  is a block diagram illustrating a construction of an apparatus for adaptively changing a constant power level in compliance with a system specification according to the present invention; and 
         FIG. 2  is a flow diagram illustrating a procedure of a method for adaptively changing a constant power level in compliance with a system specification according to an exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Preferred exemplary embodiments of the present invention will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions may not be described when their inclusion could obscure appreciation of the invention by a person of ordinary skill in the art with such well-known functions or constructions. 
     The following exemplary description pertains to an apparatus and method for determining a load level of a system using system specification information, searching for a constant power level corresponding to the determined load level, and adaptively changing a constant power level of the system. 
     The system specification information can include, for example, information on processing speeds or capabilities of various parts of the system, such as, for example, a Central Processing Unit (CPU), a graphic chipset, a memory, etc. mounted on a main board. In an exemplary embodiment of the present invention, the processing speeds of the CPU, graphic chipset, and memory are described below, as an example. Here, the load level is to stepwise classify a load of a system based on a reference value. 
       FIG. 1  is a block diagram illustrating an exemplary construction of an apparatus for adaptively changing a constant power level in compliance with a system specification according to the present invention. 
     As illustrated in the example shown in  FIG. 1 , the apparatus typically includes items such as a system specification information acquiring unit  100 , a load level determining unit  102 , a constant power level searching unit  104 , a circuit element operation enable signal searching unit  106 , a constant power level adaptive changing unit  108 , an adapter connecting unit  110 , a system unit  112 , a controller  114 , a charging unit  116 , a battery  118 , and a discharge switching unit  120 . A person of ordinary skill in the art should understand and appreciate that all the units shown can be discretely arranged or the functionality could be provided by units having more than one function. 
     Referring again to  FIG. 1 , as the system is powered on, the system specification information acquiring unit  100  acquires specification information about the system. Here, the specification information on the system can be information on processing speeds of a CPU, a graphic chipset, and a memory, just to name a few possible examples. 
     The load level determining unit  102  compares a system specification with a reference value and determines a load level of the system. That is, the load level determining unit  102  compares a processing speed of the CPU with a reference value and, depending on the comparison result, determines a load level of the CPU. Also, the load level determining unit  102  determines load levels of the graphic chipset and memory in a similar manner. 
     The constant power level searching unit  104  searches a values in storage which preferably comprises a table representing a constant power level by load level for a constant power level corresponding to the determined load level. Here, the table can additionally represent, for example, operation enable signals of elements within a constant power level changing circuit, by a constant power level. These values can be also represented by a separate table. 
     The circuit element operation enable signal searching unit  106  searches the table for the operation enable signals of the elements within the constant power level changing circuit for change into the searched constant power level, and outputs the searched operation enable signals to the constant power level adaptive changing unit  108 . 
     Still referring to  FIG. 1 , the constant power level adaptive changing unit  108  changes a circuit time constant using the searched operation enable signals of the elements within the constant power level changing circuit. By doing so, the constant power level adaptive changing unit  108  adaptively changes a constant power level of the system into the searched constant power level. 
     The adapter connecting unit  110  connects an adapter (not shown) that is an external power source to the system, and receives a supply of a power from the external power source via the adapter connecting unit, and supplies the power source to the system unit  112 . 
     The system unit  112  receives the supply of power from the external power source via the adapter (not shown) through the adapter connecting unit  110 . If the external power source (not shown) is not supplied via the adapter (not shown), the system unit  112  may receive a supply of a power from the battery  118 . 
     If the power source from the adapter (not shown) is supplied to the system unit  112  via the adapter connecting unit  110 , the controller  114  transmits a discharge off signal (DIS_OFF) to the discharge switching unit  120 , thus switching off the discharge switching unit  120 . This reason for switching off the discharge switching unit is to supply the power source from the battery  110  to the system unit  112  when it is impossible to supply the power source from the adapter (not shown). If there is a need to supply power from the battery  118  as above, the controller  114  transmits a discharge on signal (DIS_ON) to the discharge switching unit  120 , thus switching on the discharge switching unit  120 . Also, if the external power source from the adapter (not shown) is supplied to both the battery  118  and the system unit  112 , the controller  114  preferably controls an intensity of the power source, which is supplied to the battery  118  through the charging unit  116 , according to a constant power level adaptively changed by the constant power level adaptive changing unit  108 . In other words, in this example the controller  114  controls the charging unit  116  to charge the battery  118  with a constant power according to the adaptively changed constant power level. 
     The charging unit  116  charges the battery  118  with power from the adapter (not shown) through the adapter connecting unit  110 , under control of the controller  114 . 
     Still referring to  FIG. 1 , the battery  118  is charged by receiving a supply of a power source from the charging unit  116 . After that, the battery  118  supplies the charge power source to the system unit  112 , under control of the discharge switching unit  120 . 
     The discharge switching unit  120  is switched on or off depending on the discharge on/off signal (DIS_ON/OFF) received from the controller  114 , thus controlling discharge of the battery  118 . That is, the discharge switching unit  120  controls the battery  118  to supply the power source to the system unit  112 . 
     If a power source is supplied to the system unit  112  in accordance with system driving and simultaneously intends to charge the battery  118 , the apparatus determines a load level of the system unit  112  using system specification information, adaptively changes a constant power level according to the determined load level, and charges the battery  118  with a constant power according to the adaptively changed constant power level, thereby being capable of charging the battery  118  and simultaneously, stably supplying power from the power source even to the system unit  112 . 
       FIG. 2  is a flow diagram illustrating an exemplary procedure of a method for adaptively changing a constant power level in compliance with a system specification according to an exemplary embodiment of the present invention. 
     Referring now to  FIG. 2 , in step  201 , an apparatus for adaptive changing a constant power level determines if a system is powered on. If the system is powered on, in step  203 , the apparatus acquires specification information on the system. The specification information about the system can be information regarding processing speeds of a CPU, a graphic chipset, a memory, etc., for example. 
     Then, in step  205 , the apparatus determines if the processing speed of the CPU is less than a 1 st  reference value. If the processing speed of the CPU is less than the 1 st  reference value, in step  209 , the apparatus determines a load level of the CPU as ‘c’. On the contrary, if the processing speed of the CPU is not less than the 1 st  reference value, in step  207 , the apparatus determines if the processing speed of the CPU is less than a 2 nd  reference value. If the processing speed of the CPU is not less than the 1 st  reference value but is less than the 2 nd  reference value, in step  211 , the apparatus determines the load level of the CPU as ‘b’. On the contrary, if the processing speed of the CPU is not less than the 2 nd  reference value, in step  213 , the apparatus determines the load level of the CPU as ‘a’. Here, the 1 st  reference value is set to be less than the 2 nd  reference value. 
     Then, in step  215 , the apparatus determines if the processing speed of the graphic chipset is less than a 3 rd  reference value. If the processing speed of the graphic chipset is less than the 3 rd  reference value, in step  219 , the apparatus determines a load level of the graphic chipset as ‘f’. On the contrary, if the processing speed of the graphic chipset is not less than the 3 rd  reference value, in step  217 , the apparatus determines if the processing speed of the graphic chipset is less than a 4 th  reference value. If the processing speed of the graphic chipset is not less than the 3 rd  reference value but is less than the 4 th  reference value, in step  221 , the apparatus determines a load level of the graphic chipset as ‘e’. On the contrary, if the processing speed of the graphic chipset is not less than the 4 th  reference value, in step  223 , the apparatus determines the load level of the graphic chipset as ‘d’. Here, the 3 rd  reference value is set to be less than the 4 th  reference value. 
     Then, in step  225 , the apparatus determines if the processing speed of the memory is less than a 5 th  reference value. If the processing speed of the memory is less than the 5 th  reference value, in step  229 , the apparatus determines a load level of the memory as ‘i’. On the contrary, if the processing speed of the memory is not less than the 5 th  reference value, in step  227 , the apparatus determines if the processing speed of the memory is less than a 6 th  reference value. If the processing speed of the memory is not less than the 5 th  reference value but is less than the 6 th  reference value, in step  231 , the apparatus determines the load level of the memory as ‘h’. On the contrary, if the processing speed of the memory is not less than the 6 th  reference value, in step  233 , the apparatus determines the load level of the memory as ‘g’. Here, the 5 th  reference value is set to be less than the 6 th  reference value. 
     Then, in step  235 , the apparatus searches a table representing a constant power level by load level for a constant power level corresponding to the determined load level. The exemplary table representing the constant power level by load level can be configured as in Table 1 below: 
     
       
         
               
               
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
             
             
               
                   
                   
               
               
                   
                 Load level 
                   
               
             
          
           
               
                   
                   
                 Graphic 
                   
                 Enable 
                 Constant power 
               
             
          
           
               
                 Mode 
                 CPU 
                 chipset 
                 Memory 
                 A 
                 B 
                 C 
                 level (Watt) 
               
               
                   
               
             
          
           
               
                 1 
                 a 
                 d 
                 g 
                 H 
                 L 
                 L 
                 A(High) 
               
               
                 2 
                 a 
                 d 
                 h 
                 H 
                 L 
                 L 
                 A(High) 
               
               
                 3 
                 a 
                 d 
                 i 
                 H 
                 L 
                 L 
                 A(High) 
               
               
                 4 
                 a 
                 e 
                 g 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 5 
                 a 
                 e 
                 h 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 6 
                 a 
                 e 
                 i 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 7 
                 a 
                 f 
                 g 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 8 
                 a 
                 f 
                 h 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 9 
                 a 
                 f 
                 i 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 10 
                 b 
                 d 
                 g 
                 H 
                 L 
                 L 
                 A(High) 
               
               
                 11 
                 b 
                 d 
                 h 
                 H 
                 L 
                 L 
                 A(High) 
               
               
                 12 
                 b 
                 d 
                 i 
                 H 
                 L 
                 L 
                 A(High) 
               
               
                 13 
                 b 
                 e 
                 g 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 14 
                 b 
                 e 
                 h 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 15 
                 b 
                 e 
                 i 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 16 
                 b 
                 f 
                 g 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 17 
                 b 
                 f 
                 h 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 18 
                 b 
                 f 
                 i 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 19 
                 c 
                 d 
                 g 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 20 
                 c 
                 d 
                 h 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 21 
                 c 
                 d 
                 i 
                 L 
                 H 
                 L 
                 B(Medium) 
               
               
                 22 
                 c 
                 e 
                 g 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 23 
                 c 
                 e 
                 h 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 24 
                 c 
                 e 
                 i 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 25 
                 c 
                 f 
                 g 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 26 
                 c 
                 f 
                 h 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                 27 
                 c 
                 f 
                 i 
                 L 
                 L 
                 H 
                 C(Low) 
               
               
                   
               
             
          
         
       
     
     The table is realized on the basis of expectations of power consumption in compliance with a system specification. The table can additionally represent operation enable signals of elements within a constant power level changing circuit for change into a corresponding constant power level as in Table 1. The elements within the constant power level changing circuit are to adaptively change a constant power level as preferred. For example, a resistance element corresponds to this like the constant power level adaptive changing unit  108  of  FIG. 1 . The elements are enabled by corresponding operation enable signals (A, B, and C), respectively. High (H) or Low (L) of the operation enable signals (A, B, and C) corresponding to the respective elements are determined by the circuit element operation enable signal searching unit  106 . The circuit element operation enable signal searching unit  106  searches for the H/L of the operation enable signals of the elements within the constant power level changing circuit for change into the searched constant power level, using Table 1. A switch is connected by element. The On/Off status of each switch is determined by H/L of an operation enable signal of a corresponding element. In a variation of the exemplary method, without a switch connection, the circuit element operation enable signal searching unit  106  may directly control enabling of each element. 
     Then, in step  237 , the apparatus searches for the H/L of the operation enable signals of the elements within the constant power level changing circuit for change into the searched constant power level, using Table 1. 
     For example, if the load levels of the CPU, graphic chipset, and memory are determined to be ‘c’, ‘d’, and ‘h’, respectively, a constant power level can be searched as ‘B’ in Table 1. Also, the operation enable signals (A, B, and C) of the elements within the constant power level changing circuit for change into the searched constant power level ‘B’ can be searched as ‘L’, ‘H’, and ‘L’, respectively, in Table 1. 
     Then, in step  239 , the apparatus changes a circuit time constant using the searched operation enable signals for the elements within the constant power level changing circuit, thereby completing an adaptive change into the searched constant power level. 
     Finally, the apparatus terminates the procedure according to the present invention after completing the adaptive change to the constant power level. 
     In the above and other exemplary embodiments of the present invention, processes of determining load levels of a CPU, a graphic chipset, and a memory can be each performed sequentially or simultaneously. 
     As described herein above, the present invention has an advantage of being able to minimize the number of kinds of main boards irrespective of the kinds of several CPUs and adaptively change a constant power level in compliance with a system specification, by determining a load level of a system using system specification information, searching for a constant power level corresponding to the determined load level, and changing the constant power level. Further, the present invention has an advantage of being able to optimize a system load, minimize an excess of a capability of an adapter, and prevent overheating, etc., thus improving safety of the system, by adaptively changing a constant power level in compliance with a system specification as disclosed herein above. 
     While the invention has been shown and described with reference to certain preferred exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.