【正文】 端穩(wěn)壓器穩(wěn)壓電路如圖 所示，在輸入與公共端之間、輸出端與公共端之間分別接了 、 的電容 ,可以防止自激振蕩。 5. 4 穩(wěn)壓部分 穩(wěn)壓部分是系統(tǒng)的實現(xiàn)核心， DAC 模塊輸出的模擬信號決定最終的輸出電壓，電路如圖 [10] 。為了減小誤差，所以將電壓的設定值限定在 3V— — 11V之間。 圖 系統(tǒng)軟件流程圖德州學院 機電工程系 2021屆 自動化專業(yè) 畢業(yè)論文（設計） 結束語 該設計采用閉環(huán)反饋調整的方法，設計出了實用的直流電壓源 ，其電壓輸出的級數與D/A 的位數有緊密關系，本設計采用了 8 位的 D/A，若采用 12 位或 16 位的 D/A 轉換器進行相應的閉環(huán)調整，直流電源的精度會進一步提高。在這里同樣感謝他們的辛勤工作！ 由于本人學術水平有限，論文可能存在諸 多不足之處望評委老師多多批評指正！ 德州學院 機電工程系 2021屆 自動化專業(yè) 畢業(yè)論文（設計） 附錄一 系統(tǒng)源程序 ORG 30H START:MOV R1,64H ；輸出電壓初使化 MOV 40H,0 ；設定為 5V MOV 41H,5 MOV 42H,0 DL: JB ,DL1 ； +鍵按鍵處理 CALL DELAY CJNE R1,0F0H,DL3 JMP DL2 DL3: INC R1 ；輸出電壓增加 INC R1 INC 42H MOV R5,42H CJNE R5,0AH,DL2 MOV 42H,0 INC 41H MOV R5,41H CJNE R5,0AH,DL2 MOV 41H,0 INC 40H JMP DL2 DL1: JB ,DL2 ； 鍵按鍵處理 CALL DELAY CJNE R1,03CH,DL4 JMP DL2 DL4: DEC R1 ；輸出電壓減少 DEC R1 DEC 42H MOV R5,42H CJNE R5,0FFH,DL2 MOV 42H,9 DEC 41H MOV R5,41H CJNE R5,0FFH,DL2 MOV 41H,9 DEC 40H MOV R5,40H CJNE R5,0FFH,DL2 MOV 40H,0 DL2: MOV P0,R1 ；數據顯示 CALL DISP JMP DL DELAY:MOV R4,02H ； 延時 德州學院 機電工程系 2021屆 自動化專業(yè) 畢業(yè)論文（設計） DELAY3:MOV R3,0FFH DELAY1:MOV R2,04FH DELAY2:DJNZ R2,DELAY2 DJNZ R3,DELAY1 DJNZ R4,DELAY3 RET DISP: MOV P3,0F7H ；顯示子程序 MOV P2,3EH ；顯示單位 CALL DELA MOV DPTR,TAB ；顯示小數位 MOV A,42H MOVC A,A+DPTR MOV P3,0FBH MOV P2,A CALL DELA MOV A,41H ；顯示個 位數 MOVC A,A+DPTR ；至小數點 ADD A,80H MOV P3,0FDH MOV P2,A CALL DELA MOV R5,40H CJNE R5,0,DISP1 RET DISP1: MOV A,40H ；顯示十位數 MOVC A,A+DPTR MOV P3,0FEH MOV P2,A CALL DELA RET DELA: MOV R3,04FH ；延時 DELA1: MOV R2,57H DELA2: DJNZ R2,DELA2 DJNZ R3,DELA1 RET TAB:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,77H ；數碼管顯示數據表 END 德州學院 機電工程系 2021屆 自動化專業(yè) 畢業(yè)論文（設計） 附錄二 系統(tǒng)總電路圖一 德州學院 機電工程系 2021屆 自動化專業(yè) 畢業(yè)論文（設計） 附錄三 系統(tǒng)電路圖二 g an employment tribunal clai Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. To find your nearest CAB, including those that give advice by , click on nearest CAB. For more information about making a claim to an employment tribunal, see Employment tribunals. The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day。二十年的人生軌跡深深淺淺，突然就感覺到有些事情，非做不可了。 Then in high school, think don39。 A person39。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多 緣分 ，有很多錯過，好像冥冥之中真的已經注定。 From the corner at the beginning of deep friendship。 Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. 德州學院 機電工程系 2021屆 自動化專業(yè) 畢業(yè)論文（設計） Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he