【正文】 c violat ions, t r aff ic accident s, t he f ugit ive suspect suspect ed vehicles and t heft t han t o wor k, f ur t her t ight car , dr iving m anagem ent business f or malit ies r eview pr ocedur es. . . Tr uck driver inf or mation m anagem ent plat f orm . M otor vehicles and t r aff ic police depar tm ents, St ate t r ansport aut hor it y t o f ur t her clar if y the Division of labour , im plem ent ation r esponsibilt y, st r engt hen our colabor at ion and m anagement ogether , r einf orcing t he managem ent of dr ivers on which st r ongly synt hetic war f are and inf or mation war f ar e. 3 st rict ly im plem ent ed. Fr om M ay 1 up, a is im plem ent ed plex r oad and bad weat her dr iving exam , cur rent ly DM V is ur ged cont ract or s part y in t r easur es dr iving school incr eased sim ulat ion Highway, and cont inuous ur gent det ours, and snow days, and wet sliding r oad, and bur st sit uat ion disposal, subj ect s I I field t o dr iving exam pr oject, is expected 摘 要 本文主要論述了一種基于 AT89C51 單片機為核心控制器的 數(shù)控直流穩(wěn)壓電源 的設(shè)計原理和實現(xiàn)方法 ， 其主要 由 輔助 電源、顯示電路、控制電路、數(shù)模轉(zhuǎn)換電路、 穩(wěn)壓 電路 和模數(shù)轉(zhuǎn)換電路六 部分組成 。 該系統(tǒng)原理是以 AT89C51 單片機為控制單元，以數(shù)模轉(zhuǎn)換芯片 DAC0832 輸出參考電壓，以模數(shù)轉(zhuǎn)換芯片 TLC1534 對采樣值進行轉(zhuǎn)換為數(shù)字信號。輔助 電源提供各個芯片、數(shù)碼管 和 放大器所需 工作 電壓 ， 顯示電路用于顯示電源輸出電壓的大小 ， 輸出電壓值可通過按鍵對其進行步進控制（ 177。 ），并且在按鍵長時間按下的時候能連 續(xù)增加或減小。與傳統(tǒng)的穩(wěn)壓電源相比具有操作方便，電源穩(wěn)定性高以及其輸出電壓大小采用數(shù)碼顯示的特點 。該系統(tǒng)具有抗干擾性能好，可靠性高，及最終輸出電壓值與真實顯示值精確度較高等優(yōu)點。 關(guān)鍵詞 : 數(shù)控 直流 穩(wěn)壓電源 AT89C51 DAC0832 TLC1543 evaluat ion of scient if ic developm ent . Natur e secur it y t ype natur e securit y is t o m aint enance people of healt h value f or t arget , t hrough st rengthening secur it y based m anagement , and r is k m anagement , and equipm ent m anagement and t echnology super vision, ensur e pr oduction in t he people, and r eal, and syst em, and system, elem ent s secur it y reliable, and har m ony unif ied, f ul cont rol var ious against f actor s, achieved t hought no slack, and management no em pty document , and equipm ent no hidden, and syst em no blocked, and unit zer o nonst opped. Qualit y and ef f iciencyqualit y benef it is t o adhere t o t he enter prise survival, pr ofit and developm ent business t rut h, adher e t o t he all act ivit y is econom ic activit y, all cost s can be cont roled, m oney should not be wast ed m anagement philosophy, m anagement analysis, t o im prove management qualit y, im prove cost contr ol capacit y and m ar ket petit iveness. Innovation of science and t echnologyscience and t echnology innovat ion is t o play t he r ole of science and t echnology as t he pr im ar y pr oduct ive f orce, act ive use of new t echnologies, new m at er ials, new pr ocesses, new equipm ent , incr ease invest ment in science and t echnology, st rengthening scientif ic and t echnological t r aining, speeding up t ransfor ming scient if ic and t echnological achievement s, f or ming a num ber of pr opr ietar y technology, enhancing cor e petit iv eness. Resour cesaving t he resources saving ent erpr ise was t o r educe coal consum pt ion, wat er consum ption, elect ricit y at t he cor e, enhance t he oper ation of lean m anagem ent t o r ealize low consumpt ion, high ef ficiency, r educe pr oduction cost s. Second is t o st rengthen t he business, f inancial, m ater ial, inf orm at ion and t he opt imizat ion of or ganizat ion and management, s aving t he int er nal t r ansact ion costs. Har m onious development of harm onious developm ent is t o const ruct a for eign envir onment f or development . XI NG ref ers t o t he int er nal secur it y f ir m and int er nal m anagement of t he int ernal m anagem ent m easur es ar e eff ect ive, har m onious. Foreign cur r ency m eans Ent er pr ise coordinat ing development of hom eopat hy, well, get along wit h t he neighbor s bett er. ( B) XX 2021 five ent er pr ises building int r insic saf ety power pany goals ar e: unplanned out age 0 t im es. Class of disor der s 0, 0 is equivalent f or ced outage r at e. No per sonal inj ur y accident , m ater ial and equipm ent accidents do not occur , no f ir e, no envir onm ental polut ion accident . Ent erpr ise int egrat ed t o achieve zero cases of violat ion, zero accidents, zer o. Qualit y goal is: when generating capacity ≥ 7. 5 bilon kilowatt, sales of over 7. 1 bilon kWh, total profits of ≥ 306. 6 milon Yuan, . . . BFS+、 PI、 MI S、 SCM I nf orm at ion systems inf r ast ruct ur e, f uly int egr ated inf or mat ion syst em t o r ealize inf or m at ion r esour ces shar ing。 t o expand t he br eadt h and dept h of t he por t al syst em , inf or m at ion syst em of Ent er pr ise M anagem ent Assist ant r ole t o play。 t o im pr ove t he day to day oper at ion and m aint enance oper at ion r ecor d of pr om ot ing causes and t r ansf er syst em 。 t o st r engt hen t he t r aining super vision in lar ge and m edium goods vehicle. A is est ablished lar ge vehicles and sm al vehicles classif icat ion m anagem ent of mot or vehicle t est mode, incr eased m edium van car , and dangerous goods t r anspor t car, and school car t est pr oject。 I I is est ablis hed m ot or vehicle t est r egulat ory plat f orm , achieved mot or vehicle t est f ul pr ocess video, and dat a r em ote r egulator y。 t hr e is st r ict ly mot or vehicle ident if icat ion m anagement , equipped wit h unif ied of ident if icat ion equipm ent and t ool, using mobile ident if icat ion Ter minal, and law enf or cement r ecords inst rum ent , t echnology ident if icat ion m eans. As t o 20XX year s J une 20 stat ewide m otor vehicle keep volume f or 567, 408 car , and last year ear lier t han gr owt h 75, 814 car, gr owth 13. 36%。 t his year J anuary June, vehicles m anagement sect ion and license ar chives m anagement sect ion t otal accept ed t he m otor vehicle r egist r at ion business 42,543 car