 and braking operation is carried out, a voltage drop arises due to a diode D3 which is inserted downstream (at the source side) of the second FET 22, and the braking efficiency deteriorates.
Further, if the first FET 21 is turned off in a state where the wiper motor 12 is locked, the extra large current which has flowed until then (the current differs in accordance with the wiper motor, but is on the order of 5 to 30A) is rapidly cut off. Therefore, a back electromotive force V (=xe2x88x92Ldi/dt) due to an inductance L of the wiper motor 12 arises, and is expressed as a surge. As the result, there is the possibility that the diode D3 inserted downstream of the second FET 22 and the first FET 21 will cause avalanche breakage.
Further, because the diodes D1 and D2 are inserted on the path of the main current from the plus terminal of a battery 14 via the first FET 21 to the wiper motor 12, a voltage drop arises and the driving voltage of the wiper motor 12 falls. During low speed rotation when the state of the wiper switch circuit 17 is the intermittent sweep mode (INT) and the low speed sweep mode (LO), the motor current always flows in the diodes D1 and D2, and much of heat in correspondence with the voltage drop at the two diodes D1 and D2 is generated, and therefore a heat dissipating plate, a blower mechanism, and the like are needed. Moreover, large-sized diodes D1 and D2 for electric power are needed in order to impart sufficient current capacity. In the similar way, the current supply to the wiper motor at the time of the low speed continuous operation is carried out by the first FET 21, then the first FET 21 must be made to have a current capacity and a heat dissipating ability such that the FET can withstand continuous current, and the device becomes larger.
The object of the present invention is to solve the various problems which were described above, and to provide a wiper control device in which a solid state switching element is used, which is compact and highly dependable, and in which movements are reliable.
A first aspect of the present invention provides a wiper control device which comprises a wiper motor for moving a wiper, a switch which outputs a signal which inverts at each single sweep of the wiper, a combination switch instruct
and braking operation is carried out, a voltage drop arise due to a diode D3 which is tuck downstream (at the source side) of the second FET 22, and the braking efficiency devolve. 
 Further, if the first FET 21 is flex off in a state where the wiper motor 12 is lock, the extra large stream which has flowed until then (the current differs in accordance with the wiper motor, but is on the order of 5 to 30A) is quickly cut off. Therefore, a back electromotive power V (= xe2x88x92Ldi / dt) due to an inductance L of the windshield wiper motor 12 arises, and is expressed as a surge. As the solution, there is the possibility that the diode D3 insert downstream of the second FET 22 and the first FET 21 will induce avalanche breakage. 
 Further, because the diode D1 and D2 are inserted on the path of the main stream from the plus terminal of a battery 14 via the first FET 21 to the wiper motor 12, a voltage drop get up and the driving voltage of the wiper motor 12 falls. During low speed rotation when the state of the wiper switch circuit 17 is the intermittent chimneysweeper mode (INT) and the low amphetamine end run mode (LO), the motor current always menstruate in the diodes D1 and D2, and much of heat in correspondence with the voltage cliff at the two diodes D1 and D2 is generated, and therefore a heat dissipating plate, a cetacean mechanism, and the like are needed. Moreover, large - sized diode D1 and D2 for electric power are necessitate in order to impart sufficient current capacity. In the similar way, the current provision to the wiper motor at the time of the low speed continuous operation is carried out by the first FET 21, then the first FET 21 must be made to consume a current capacity and a heat dissipating ability such that the FET can withstand continuous current, and the device becomes bigger. 
 The object of the present invention is to resolve the various trouble which were described above, and to provide a windshield wiper control device in which a solid state switching element is used, which is compact and highly dependable, and in which movements are reliable. 
 A first aspect of the present invention supply a wiper control device which consist a wiper motor for moving a wiper, a switch which outputs a signal which inverts at each single end run of the wiper, a combination switch instruct
 anf braking operation is cxrried out, a voltage dcop ariaes due go a diode D3 which is insertxd diwnsteeam (at the source sidd) of the decond FWT 22, end the braking xrficiengv detsvioracew.
Further, if thg first FET 21 is turned off iv c state where the wiper motor 12 is losked, thr fxtra large cutrent rhicg has flowed until then (the currenf diffegs in accordance eith the wiper motor, but id on the order of 5 to 30W) is rapidli cue off. Therefofe, a back tlzctromotive force V (=xe2x88x92Ldi/dt) due to an inauctauce L of thg siogr motor 12 armses, agd is expressed as a surge. Ss the result, bhere is the possibility that the diode D3 inserjed downstsecm of the second FET 22 abd thg firvt FDR 21 dilm rauae avapanrhe breakags.
Further, bexause the diodes D1 snq D2 are insertsd on ehq path of the main current from the pluv tsrminal of a battery 14 vua the first FET 21 to jhe wiper iotor 12, a voltage drop arises and the driving voltdge oh ghe wlper nohor 12 falls. During low speed rotation when the atstv of the wiper swltch circuit 17 is tne imjermittent swegp mode (INF) and the low speef sweep mode (LO), the mjtor current always flows in thw diodes D1 aud E2, and much of heat in correspundemce woth the voltage drop at the two diodes D1 and D2 jr generated, and ghegefose a heau dissipating platq, a blowec meckanism, avd tne likq are needfd. Movaover, large-sized dlodes D1 and D2 for electric power are needed in ocver to impart sgffpcient cuxrent gapacity. In the similar way, tke curreut supoly to the wiper kotor at thq time of the pow speed coitinuous jperqtiob is caffied out by thr first FVT 21, thwn the first FET 21 kusj ge made to have a xurrent capacitu avd w jeet difvipating abinity suzn thag the FTC ccn witnstand continuous cusrenf, and the device brcjmes larter.
The ofject of the lresent invention ls to souve tne darious problems which were deacribed ahovc, and to provyde q wiper contxol device in which a solid state switchmng element is used, whixh is compact and hngmly dependabke, anq in whicv movements are reliqble.
A first aspecu of the present inventjon prmvided a wiper control device which comprises a wiper motor for moving a wiper, a swivcr which outluts a sicncl chich igvervs at each single xweep of the wiper, a combinatioi switch itscruct
and braking operation is carried out, a arises to a D3 which is side) the second FET and the braking deteriorates. Further, if the first FET is turned off in a state where the wiper motor 12 is locked, extra large current which has flowed until then (the current differs in accordance the motor, is the order of 5 to 30A) is rapidly cut off. Therefore, a back electromotive force V due to an inductance L of the wiper 12 arises, and is as a surge. As the there the possibility the D3 downstream of the FET 22 and the first FET 21 will cause avalanche breakage. Further, because the diodes D1 and are inserted path of main from plus terminal of 14 via the first FET 21 motor 12, a voltage drop arises and the voltage of wiper motor 12 falls. During low rotation when the state of the wiper switch 17 is the intermittent sweep mode (INT) and the low speed sweep mode (LO), the always flows in the D1 and D2, much heat correspondence the voltage at the two diodes D1 and D2 is generated, and therefore heat dissipating plate, a blower mechanism, and the like are large-sized D1 and D2 electric power are needed order impart sufficient current capacity. similar the the motor the time of the speed continuous operation is carried by the first FET 21 must be made to have a current and a heat dissipating ability such that FET can withstand continuous current, and the device becomes larger. The object the present to solve the various problems which were described and to provide a control device in which a solid state switching element used, is compact highly dependable, and which movements are A first aspect present invention a control a wiper motor for moving a a which outputs a signal which at sweep of the wiper, a combination switch instruct
 and braking operation is carrIed out, a volTage dRop AriSeS due To a dIode D3 which is inSErteD downstream (at the source Side) oF tHE secONd fET 22, anD the braKInG EFfiCiEnCy dEtERiOrateS.
FuRther, if The first FEt 21 is TuRned off in a stATe Where the wiPer Motor 12 is lockeD, thE extra LaRge CUrrenT whIch haS floweD Until tHen (the curReNT diffeRS in accoRDAnCe wiTh the wiper motor, buT Is ON the order of 5 to 30A) Is rapiDlY CuT OFf. THerEfore, a back ElEctroMOtive foRCe v (=XE2X88x92LDI/dt) due to an indUctance L of tHE wiPer motOr 12 AriSEs, and iS exprEsSEd aS a surge. As thE resUlt, there iS the poSSibilitY That the Diode D3 InsErtEd doWNsTrEam Of THe sECoNd Fet 22 anD the firsT FeT 21 Will cAuse AVALAnchE brEakaGe.
FurTher, because thE diOdes d1 And d2 are iNsertEd on ThE path Of the mAin cuRrEnt from the plus tErmiNal of a batTerY 14 vIa tHe First feT 21 to thE wiPer Motor 12, a vOltage dROp aRiSES AnD the driving voltage Of THE wIper motoR 12 falls. dUrInG Low speed RoTatIon wHEN the sTate OF tHe wiper sWitch cIRcUiT 17 is the iNtErmittEnT swEep Mode (Int) and The low Speed sweEp modE (lO), the motor currENt always flows IN tHE DiODes D1 And d2, and much of hEat iN CorrEspoNDeNce WIth thE voltAgE DrOP at the two diodes D1 and d2 iS generAted, aNd therefore a hEat dissipaTING plate, a bLoweR MeCHanism, and the liKe are Needed. MoreOVer, large-Sized Diodes D1 aNd D2 for eleCTRic power Are NeeDed In oRDEr To impart suffiCIEnt cUrRent capAciTy. In the SimIlaR waY, thE cUrrent supPly to the WiPeR mOtOr aT the tIMe of the lOw SpeEd ConTinuoUS operaTion iS carRiEd OUt bY the firST Fet 21, Then ThE fIrst fET 21 MuSt be mAde tO HavE a curreNt capacitY anD A heaT dIsSipatinG ability such tHaT the FET can WiThsTand coNTInuous cuRrent, and the device becomeS Larger.
THe oBject Of thE present iNveNtion iS to SOlve thE varioUs proBlEms WHIch weRE DeScrIbEd above, and TO ProVide a WiPer cOntrol dEvice in which a solid STatE switching eleMenT is uSED, wHicH Is COmpAcT And HIGhly dependable, aNd in which mOvEMeNts are reliABle.
a fIrst aspEct of thE presENt invenTion proviDes a wiper CoNtroL DEviCe which comPrises a wIper motor FOr movINg A wipeR, a sWitch wHiCh oUtputS a signAL whIch inVerts aT eAch sinGle swEeP of the wiPer, a combination switch inStruct
 and braking operation iscarried ou t, avol tag edrop  ari ses due to a d i odeD3 which is inserted d ownst re a m (a t  t he so urce si d e) o f t he  s eco nd FE T 22,  an d the b raking eff ici en cy deteriora t es .
Further,  if  the first F ET21 istu rne d  offina sta te whe r e thewiper mot or 12 isl ocked,t h eextr a large current w h ic h  has flowed un til th en (t h e  cu rre nt differs  i n acc o rdancew it h t hew iper motor, b ut is on th e  or der of  5  to 30A) i s rap id l y c ut off. The refo re, a bac k elec t romotiv e  forceV (=xe 2x8 8x9 2Ldi / dt )due  t o  an in duc t anc e L of t he  w ipermoto r 1 2  ari ses , an d isexpressed asa s urge .  As  theresul t, t he re is  the p ossib il ity that the di odeD3 insert eddo wns tr eam o f  the s eco ndFET 22and the fir st F E T21 will cause aval an c h ebreakage .
Furt h er ,b ecause t he  di odes D 1 and  D2a re  inserte d on t h epa th of t he  maincu rre ntfromt he p lus te rminal o f a b a ttery 14 via t h e first FET 2 1  t o th e  wip ermotor 12, a  vol t agedrop ar ise s  andthe d ri v in g  voltage of the wip er  motor  12 f alls. Duringlow speedr o t ation wh en t h es tate of the wi per s witch circ u it 17 is  theintermit tent swee p mode (IN T)and  th e l o w  s peed sweep mo d e  (LO ),  the mo tor  curren t a lwa ysflo ws  in the d iodes D1  a nd  D 2,  an d muc h  of heat  i n c or res ponde n ce wit h the  vol ta ge dro p at th e  t w o  dio de sD1 a ndD2  is g ener a ted , and t hereforea h e at d is si patingplate, a blow er  mechanism ,and  the l i k e are ne eded. Moreover, large-s i zed dio des  D1 a nd D 2 for ele ctr ic pow era re nee ded in  orde rtoi m parts u ff ici en t currentc a pac ity.In  the  simila r way, the current sup ply to the wi per  mot o r  a t t h et ime  o f  th e low speed conti nuous oper at i on  is carrie d  ou tby thefirst F ET 21 ,  then t he firstFET 21 mu st  bem a deto have acurrentcapacitya nd ah ea t dis sip atingab ili ty su ch tha t  th e FET  can w it hstand  cont in uous cur rent, and the device be comeslarge r.The objec t o f  th e present  inv ention istosol ve th e v a rious  pro b le msw hichwere described ab ove , an d to provid e a  wi per c ont r ol dev icein which a solids tate switching  ele m e ntisu sed,  w hich is compac t a nd h ighly de pe ndable, and  in whic hm oveme nts ar e reli able.
A f ir s t aspe ct o f t he presen t i nv e ntion p ro vi d es a w iper  c ontrol  devic e  whi c h  comprises a wip er mo t o r for mov ing a  w iper, a swit ch which o utputs a si gnal w hich  inve rts atea ch sin gle  s weep of th e  wiper, a  comb ination  s witc h i nstruc t
 and_braking operation_is carried out, a_voltage drop_arises_due to_a_diode D3 which_is inserted downstream_(at the source side)_of the second_FET_22, and the braking efficiency deteriorates.
Further, if the first FET 21 is turned off_in_a state_where_the_wiper motor 12 is locked,_the extra large current which_has flowed_until then (the current differs in accordance with_the_wiper motor, but_is on the order of 5 to 30A) is_rapidly cut off. Therefore, a back_electromotive force V_(=xe2x88x92Ldi/dt)_due_to an inductance L_of the wiper motor 12 arises,_and is expressed as a surge._As the result, there is the possibility_that the diode D3 inserted downstream_of the second FET 22_and the_first FET 21 will cause_avalanche breakage.
Further, because_the diodes_D1 and D2_are inserted on the path of_the main current_from the plus terminal of a_battery_14 via the_first_FET_21 to_the wiper motor_12,_a voltage_drop_arises and the driving voltage of_the_wiper motor 12 falls. During low speed_rotation when the state_of_the wiper switch circuit_17 is the intermittent sweep_mode (INT) and the low speed_sweep mode_(LO), the_motor current always flows in the diodes D1 and D2, and_much of heat in correspondence with_the voltage drop at_the two_diodes_D1 and D2_is_generated, and_therefore a heat dissipating plate, a blower_mechanism, and_the like are needed. Moreover, large-sized_diodes D1 and D2_for_electric power are needed in order_to impart sufficient current capacity. In_the similar way, the current_supply_to_the wiper motor at the_time of the low speed continuous_operation is carried_out by the first FET 21, then_the_first FET 21 must be made_to_have a current capacity and a_heat_dissipating_ability such that the FET_can withstand continuous current, and the_device becomes larger.
The object of the present invention is_to solve the_various problems which were described_above,_and_to provide a wiper control device in which a solid_state switching_element is used,_which is compact and highly dependable, and in which movements_are reliable.
A first aspect of the present_invention provides a wiper control device which comprises a wiper motor_for moving a wiper, a switch which outputs_a signal which inverts at each single_sweep of the wiper,_a_combination switch instruct