簡易數(shù)控直流穩(wěn)壓源的設(shè)計

電子機電論文編號:JD820  論文字?jǐn)?shù):5107,頁數(shù):13

簡易數(shù)控直流穩(wěn)壓源

目錄
摘  要 I
Abstract I
引言 1
1 系統(tǒng)總體設(shè)計任務(wù)及要求 1
2 系統(tǒng)方案設(shè)計與論證 2
2.1 方案一 2
2.2 方案二 2
2.3 方案三 3
2.4 方案分析 3
3 數(shù)控直流穩(wěn)壓源的工作原理 3
3.1 基本原理及總體方框圖 3
3.2 基本單元電路分析 4
3.2.1 數(shù)字控制部分 4
3.2.2  D/A變換部分 6
3.2.3  可調(diào)穩(wěn)壓部分 6
4 電路調(diào)試 7
5 性能指標(biāo)測試 8
6輔助電源部分 8
7 結(jié)束語 9
參考文獻(xiàn) 10
謝   辭 11

摘  要：設(shè)計一個簡易數(shù)控數(shù)顯直流穩(wěn)壓電源，包括數(shù)字控制部分，D/A變換部分和可調(diào)穩(wěn)壓部分。數(shù)字部分的核心電路采用兩片級聯(lián)的BCD碼加/減計數(shù)器CD40192；其預(yù)置輸入端D0～D3與BCD碼的撥盤開關(guān)相連，構(gòu)成電壓的預(yù)置功能；為了完成電壓的自動連續(xù)掃描，加入了CD4060，產(chǎn)生頻率為8HZ的脈沖以及由CD4011和CD4069構(gòu)成的選通門；D/A變換部分和可調(diào)穩(wěn)壓部分分別采用了價格低廉的權(quán)電阻電路和三端穩(wěn)壓集成模塊CW7805。采用Multisim2001對整個電路進(jìn)行仿真和測試，可通過按鍵對輸出電壓值進(jìn)行步進(jìn)控制（±0.1V），并且在按鍵長時間按下的時候能連續(xù)增加或減小或者直接變化到某一設(shè)定的電壓值，輸出電壓值采用三位數(shù)碼管顯示。測試結(jié)果表明，該設(shè)計滿足設(shè)計要求，具有一定的實用價值。

    關(guān)鍵詞： 數(shù)控；數(shù)顯；穩(wěn)壓電源  

              
 Simple numerical control DC source
Abstract: To design a simple digital display digital DC power supply, including the digital control part, D / A conversion part and an adjustable voltage part. The are circuit of the digital part is amposed of two cascaded BCD code plus / minus counter CD40192; its preset input D0 ~ D3 dial code annects BCD switch to antitude preset voltage function.The CD4060 is joined to complete the continuous scanning of the automatic voltage, then the digital part comes up with 8HZ pulse frequency and the composition of CD4011 and CD4069-gated.D / A conversion part uses the right to resistance that the price is very low.while three-terminal voltage regulator circuit Module CW7805 is adopted by the adjustable regulator. The Multisim2001 is used to simulate and test the entire circuit , the output voltage value which uses three digital tabe display is step controled by pressing button,and the value can be increased or decreased continuously or directly changes to a set voltage value if the time of pressing button is longer. Test results show that the design to meet the design requirements, with a certain degree of practical value.
Keywords: Digital Control; digital display; regulated power supply;