 C. Shen, “Implementation of a DSP-controlled photovoltaic system with peak power tracking,” IEEE Trans. Ind. Electron., vol. 45, no. 1, pp. 99-107, 1998.
[23] Y. H. Lim and D. C. Hamill, “Simple maximum power point tracker for photovoltaic arrays,” Electronics Letters, vol. 36, no. 11, pp. 997-999, 2000.
[24] E. Koutroulis, K. Kalaitzakis, and N. C. Voulgaris, “Development of a microcontroller-based, photovoltaic maximum power point tracking control system,” IEEE Trans. Power Electron., vol. 16, no. 1, pp. 46-54, 2001.
[25] M. A. S. Masoum, H. Dehbonei, and E. F. Fuchs, “Theoretical and experimental analyses of photovoltaic systems with voltage- and current-based maximum power-point tracking,” IEEE Trans. Energy Conversion, vol. 17, no. 4, pp. 514-522, 2002. The present invention is generally related to a power supply control apparatus and a power supply control method for use in portable electronic equipments driven by a battery. More specifically, the present invention is directed to a key input circuit, a power supply control apparatus, and a power supply control method for use in portable electronic equipments, in which a power supply control key is provided with a key switch formed by arranging a plurality of key contacts at cross points of a key matrix, a hardware size is suppressed, and a software processing sequence used to detect a depression of a key is made simple.
In a conventional power supply control apparatus, a key switch for controlling a supply of electric power is realized by a power supply control key which is arranged independently from a key matrix. When the power supply is turned ON, since this power supply control key is depressed, the power supply is directly controlled so as to commence supplying of the electric power. Also, when the power supply is turned OFF, supplying of the electric power is stopped by interrupting a process operation executed by a processing apparatus (CPU etc.), and by detecting a key depression (by monitoring key state) executed by the processing apparatus (CPU etc.) via an I/O port.
However, the power supply control key used to instruct the power supply control of the power supply and also the key
C. Shen, “ Implementation of a DSP - controlled photovoltaic system with peak exponent trailing, ” IEEE Trans. Ind. Electron. , vol. 45, no. 1, pp. 99 - 107, 1998. 
 [ 23 ] Y. H. Lim and D. C. Hamill, “ Simple maximal power compass point tracker for photovoltaic arrays, ” Electronics Letters, vol. 36, nobelium. 11, pp. 997 - 999, 2000. 
 [ 24 ] E. Koutroulis, K. Kalaitzakis, and N. C. Voulgaris, “ Development of a microcontroller - based, photovoltaic maximum power detail tracking control organization, ” IEEE Trans. Power Electron. , vol. 16, no. 1, pp. 46 - 54, 2001. 
 [ 25 ] M. A. S. Masoum, H. Dehbonei, and E. F. Fuchs, “ Theoretical and experimental analyses of photovoltaic systems with voltage- and current - base maximal power - point trailing, ” IEEE Trans. Energy Conversion, vol. 17, no. 4, pp. 514 - 522, 2002. The present invention is generally refer to a power supply control apparatus and a power provision control method for function in portable electronic equipments drive by a battery. More specifically, the present invention is directed to a key input circuit, a office supply control apparatus, and a power supply control method acting for function in portable electronic equipments, in which a power supply control key is provided with a key switch formed by arrange a plurality of key contact at hybridization points of a key matrix, a hardware size is suppressed, and a software processing succession used to detect a depressive disorder of a key is made childlike. 
 In a conventional power supply control apparatus, a key switch for control a supply of electric power is realized by a power provision control samara which is arranged independently from a key matrix. When the power supply is turned ON, since this world power supply control key is depressed, the power supply is directly controlled so as to begin supplying of the electric power. besides, when the power supply is turned OFF, supplying of the electric world power is stopped by interrupt a process operation executed by a processing apparatus (CPU etc .), and by detecting a cardinal depression (by monitoring key country) executed by the processing apparatus (CPU etc .) via an I / O port. 
 However, the ability supply control samara used to instruct the power supply control of the power provision and also the key
 C. Dhen, “Implementation of a DSP-controlled khitovolvaic syatem witf peak power tracking,” IEEE Tcans. Ind. Tjectron., vol. 45, no. 1, po. 99-107, 1998.
[23] Y. H. Lpm and D. X. Hanull, “Simple maximum power ioint vracker for phojovoltaic arsays,” Electroniws Lztters, vol. 36, no. 11, pp. 997-999, 2000.
[24] E. Koutroulis, K. Halaitzskls, and N. C. Voujgarps, “Devslopment of a microcontroller-based, photovmltaic maximuk power point tracking conhrol system,” IEEE Trans. Power Elecjdon., col. 16, no. 1, pp. 46-54, 2001.
[25] M. A. S. Masoum, H. Dehbohei, and E. F. Fuchs, “Theoretical avd ex'erimental qnqlydgs of photoviltaib systems witm voltace- and vurrent-based msxikum power-point tracking,” MEEE Trans. Energy Cogversion, eom. 17, no. 4, pp. 514-522, 2002. The peewent hnvettiov is gehecalmy relwtev to a powed supply cobtrol apparatus and a ipwer supply dontroj iethod for use in portable electronic exuilments driven by a battwry. More specifically, the presqnt invention is directed to a key input circuit, d powxr sukpoy covrrll apparatus, and a power supply control methoq fpr use in portabje electronoc eaoipments, in whkch a 'kwsr supply control ney is krovidwd with a key switch formed by arranging a plurality if key contacts at cross poincs of s key matrix, a hardware size is auppressed, wnd a soffdare processing reqlenca used to detect a depressyon of a jey ns made rimpke.
In a conventiojal power supply control appatatus, d key switfh for controlling a supply of xkectric powet iv rvalized bv a poeer supply cogtrol key whick is arrcnged kndependennly from e key matrix. When the powat supply is tnrned ON, fincw thus powef supply controk key is btpressed, tye power supply is ditedtly controlled so as to commence suoplrijg os the electriw poder. Slso, dhen tht pider xupply is turned OFF, supllying of the elecyrlc power us stoppqd by interrulting a process optratioi execnted bu a processing apparatus (CPU etc.), znd by dehecbing a key de[reswion (by monicoring key state) executed by the processmng apparatus (CPU etc.) vua an I/O port.
Howevet, tme power sup'ly cogtrol key used to instruct thw power supply coktrol of the power suplly ang alsl the key
C. Shen, “Implementation of a DSP-controlled photovoltaic peak tracking,” IEEE Ind. Electron., vol. 1998. Y. H. Lim D. C. Hamill, maximum power point tracker for photovoltaic Electronics Letters, vol. 36, no. 11, pp. 997-999, 2000. [24] E. Koutroulis, K. and N. C. Voulgaris, “Development of a microcontroller-based, photovoltaic maximum power point tracking system,” Trans. Electron., 16, no. 1, pp. 46-54, 2001. [25] M. A. S. Masoum, H. Dehbonei, and E. F. “Theoretical and experimental analyses of photovoltaic systems with and current-based maximum power-point IEEE Trans. Energy Conversion, vol. no. pp. 514-522, The invention generally related to power supply control apparatus and a power supply control method for use in portable electronic equipments driven a battery. the present is to key input circuit, supply control apparatus, and a power for use in portable electronic equipments, in which power supply key is provided with a key formed by arranging a plurality of key contacts cross points of a key matrix, a hardware size is suppressed, and a software processing to detect a depression a key is simple. a power control apparatus, key switch for controlling a supply of electric power is realized a power supply control key which is arranged independently from matrix. the power supply turned ON, since this supply key is depressed, the is controlled commence of electric power. Also, when power supply is turned OFF, of the electric power process operation executed by a processing apparatus (CPU and by detecting a key depression (by key state) executed by the processing apparatus (CPU etc.) via an I/O However, the control key used to instruct the power supply of the power supply also the key
 C. Shen, “Implementation of a DSP-Controlled PhotoVolTaiC sYsteM witH peak power tracKIng,” IeEE Trans. Ind. Electron., vol. 45, No. 1, pp. 99-107, 1998.
[23] Y. h. LIM and d. c. HAmill, “simple mAXiMUM poWeR pOinT tRAcKer foR phOtovoltAic arrays,” ELecTrOnics Letters, VOl. 36, No. 11, pp. 997-999, 2000.
[24] E. KoutrOulIs, K. KalaitzakIs, aNd N. C. VoUlGarIS, “DeveLopMent oF a micrOControLler-based, PhOTovoltAIc maximUM PoWer pOint tracking contrOL sYStem,” IEEE Trans. POwer ElEcTRoN., VOl. 16, nO. 1, pp. 46-54, 2001.
[25] m. A. S. Masoum, H. deHboneI, And E. F. FuCHs, “tHEOreTIcal and experiMental analySEs oF photoVoLtaIC systeMs witH vOLtaGe- and currenT-basEd maximum Power-pOInt tracKIng,” IEEE trans. ENerGy COnveRSiOn, Vol. 17, No. 4, PP. 514-522, 2002. ThE PrEseNT inVention iS gEnErallY relATED To a pOweR supPly coNtrol apparatuS anD a poWEr sUpply ContrOl meThOd for Use in pOrtabLe Electronic equipMentS driven by A baTtEry. moRe speCIficalLy, tHe pResent iNventioN Is dIrECTEd To a key input circuit, A pOWEr Supply coNtrol aPPaRaTUs, and a poWeR suPply CONtrol MethOD fOr use in pOrtablE ElEcTronic eQuIpmentS, iN whIch A poweR SuppLy contRol key is ProviDEd with a key switCH formed by arraNGiNG A pLUralIty Of key contacTs at CRoss PoinTS oF a kEY matrIx, a haRdWArE Size is suppressed, and A sOftwarE procEssing sequencE used to detECT A depressIon oF A kEY is made simple.
IN a conVentional pOWer supplY contRol apparAtus, a key sWITch for coNtrOllIng A suPPLy Of electric powER Is reAlIzed by a PowEr supplY coNtrOl kEy wHiCh is arranGed indepEnDeNtLy FroM a key MAtrix. WheN tHe pOwEr sUpply IS turneD ON, siNce tHiS pOWer Supply cONtROL key Is DePresSed, ThE poweR supPLy iS directLy controlLed SO as tO cOmMence suPplying of the eLeCtric power. alSo, wHen the POWer supplY is turned OFF, supplying of THe electRic Power Is stOpped by inTerRuptinG a pROcess oPeratiOn exeCuTed BY A procESSiNg aPpAratus (CPU eTC.), And By detEcTing A key depRession (by monitorinG Key State) executed By tHe prOCEsSinG ApPAraTuS (cPU ETC.) via an I/O port.
HowEver, the powEr SUpPly control KEy uSeD to instRuct the Power SUpply coNtrol of thE power supPlY and ALSo tHe key
 C. Shen, “Implementationof a DSP-c ontro lle d p ho tovo ltai c system withp eakpower tracking,” IEEETrans .I nd.E le ctron ., vol. 45 , no.  1 ,pp.  9 9 -1 07, 1 998 .
[23]Y. H. Limand  D . C. Hamill, “S imple maxi mum  power point  tr ackerfo r p h otovo lta ic ar rays,” Electr onics Let te r s, vol .  36, no . 11 , pp . 997-999, 2000.[ 24 ]  E. Koutroulis , K. K al a it z a kis , a nd N. C. V ou lgari s , “Deve l op m e n t o f  a microcontr oller-based ,  ph otovol ta icm aximum  powe rp oin t trackingcont rol syste m,” IE E E Trans .  PowerElectr on. , v ol.1 6,  n o.1, pp. 46 -54 ,  20 01.
[25]  M .A. S.  Mas o u m ,  H.Deh bone i, an d E. F. Fuchs , “ Theo r eti cal a nd ex peri me ntalanalys es of  p hotovoltaic sys tems  with vol tag e-  an dcurre n t-base d m axi mum pow er-poin t  tr ac k i n g, ” IEEE Trans. Ener gy C on version,  vol.1 7,  n o . 4, pp.  5 14- 522, 2 002.Thep re sent inv ention is  g enerall yrelate dtoa p owers uppl y cont rol appa ratus and a power su p ply control m e th o d  f o r us e i n portableelec t roni c eq u ip men t s dri ven b ya  b a ttery. More specifi ca lly, t he pr esent inventi on is dire c t e d to a k ey i n pu t  circuit, a po wer s upply cont r ol appar atus,  and a p ower supp l y  control  me tho d f oru s ein portable e l e ctro ni c equip men ts, inwhi cha p owe rsupply co ntrol ke yis  p ro vid ed wi t h a keysw itc hfor med b y  arran ginga pl ur al i tyof keyc on t a ctsat  c ross  po in ts of  a k e y m atrix,a hardwar e s i ze i ssu ppresse d, and a soft wa re process in g s equenc e used todetect a depression ofa  key is  ma de si mple .
In a co nve ntiona l p o wer su pply c ontro lapp a r atus, a  k eysw itch for c o n tro lling  a  sup ply ofelectric power isr eal ized by a pow ersupp l y  c ont r ol key  w h ich i s arranged inde pendentlyfr o ma key matr i x.Wh en thepower s upply is turn ed ON, si nce thispo wers u ppl y controlkey is d epressed, the p o we r sup ply  is di re ctl y con trolle d  so  as t o comm en ce sup plyin gof the e lectric power. Also, wh en the  powe r s upply istur n edOFF, supp lyin g of the e lec tri c pow eri s sto pped by  in t errup ting a process op era t i on  executed b y a  pr ocess ing appara tus(CPU etc.), and b y  detecting a k ey d e p res sio n  (by  m onitoring keysta te ) executed  b y the proce ssing ap pa r atus(CPU e tc.) v ia an I / O  p o rt.
Ho weve r,the power  su pp l y contr ol  k e y used  toin struct  the p o wers u pply control ofthe p o w er su p ply  andal so thek ey
 C._Shen, “Implementation_of a DSP-controlled photovoltaic_system with_peak_power tracking,”_IEEE_Trans. Ind. Electron.,_vol. 45, no._1, pp. 99-107, 1998.
[23]_Y. H. Lim_and_D. C. Hamill, “Simple maximum power point tracker for photovoltaic arrays,” Electronics Letters, vol._36,_no. 11,_pp._997-999,_2000.
[24] E. Koutroulis, K. Kalaitzakis,_and N. C. Voulgaris, “Development_of a_microcontroller-based, photovoltaic maximum power point tracking control system,”_IEEE_Trans. Power Electron.,_vol. 16, no. 1, pp. 46-54, 2001.
[25] M. A._S. Masoum, H. Dehbonei, and E._F. Fuchs, “Theoretical_and_experimental_analyses of photovoltaic systems_with voltage- and current-based maximum power-point_tracking,” IEEE Trans. Energy Conversion, vol._17, no. 4, pp. 514-522, 2002. The_present invention is generally related to_a power supply control apparatus_and a_power supply control method for_use in portable_electronic equipments_driven by a_battery. More specifically, the present invention_is directed to_a key input circuit, a power_supply_control apparatus, and_a_power_supply control_method for use_in_portable electronic_equipments,_in which a power supply control_key_is provided with a key switch formed_by arranging a plurality_of_key contacts at cross_points of a key matrix,_a hardware size is suppressed, and_a software_processing sequence_used to detect a depression of a key is made simple.
In_a conventional power supply control apparatus,_a key switch for_controlling a_supply_of electric power_is_realized by_a power supply control key which is_arranged independently_from a key matrix. When the_power supply is turned_ON,_since this power supply control key_is depressed, the power supply is_directly controlled so as to_commence_supplying_of the electric power. Also,_when the power supply is turned_OFF, supplying of_the electric power is stopped by interrupting_a_process operation executed by a processing_apparatus_(CPU etc.), and by detecting a_key_depression_(by monitoring key state) executed_by the processing apparatus (CPU etc.)_via an I/O port.
However, the power supply control key_used to instruct_the power supply control of_the_power_supply and also the key