ABB 3HAB8101-1系統(tǒng)硬件及接口電路

 2.1 ABB 3HAB8101-1控制系統(tǒng)結(jié)構(gòu)

 由80C196KC單片機(jī)組成控制系統(tǒng)結(jié)構(gòu)如圖4所示.

圖中ABB 3HAB8101-1接口芯片8155的輸出口PA0～PA7,PB0～PB3經(jīng)光隔控制短接電容接觸器D1～D12.晶閘管在軟啟動(dòng)電容時(shí),可能會(huì)產(chǎn)生較大的電流,因此必須確保晶閘管每次只啟動(dòng)一個(gè)電容,避免同時(shí)投入兩個(gè)或兩個(gè)以上電容,用接觸器Zi的輔助觸點(diǎn)互鎖,因觸點(diǎn)數(shù)量有限,不能全部覆蓋,其互鎖邏輯應(yīng)滿足:  考慮到在80C196KC系統(tǒng)中互鎖容易實(shí)現(xiàn).根據(jù)邏輯要求選擇譯碼器74LS154zui合適,由于74LS154的特性是每次僅輸出一路,用74LS154控制KP的投入接觸器Z[sub]i[/sub],可避免誤動(dòng)作,而且軟硬件較容易協(xié)調(diào),編程方便. 8155的輸出口PC[sub]0[/sub]～PC[sub]3[/sub]對(duì)應(yīng)接到74LS154的A,B,C,D輸入端,這時(shí)74LS154控制端全部有效.用PC[sub]0[/sub]～PC[sub]3[/sub]選擇不同的Y[sub]0[/sub]～Y[sub]11[/sub]（74LS154的輸出口）,對(duì)應(yīng)控制Z[sub]1[/sub]～Z[sub]12[/sub].當(dāng)不需要輸出時(shí)（即Y[sub]0[/sub]～Y[sub]11[/sub]不輸出）,僅令PC[sub]0[/sub]=PC[sub]1[/sub]=PC[sub]2[/sub]=PC[sub]3[/sub]=1,選中Y[sub]15[/sub]輸出即可.

 2.2 ABB 3HAB8101-1相位檢測(cè)電路 系統(tǒng)能準(zhǔn)確可靠地獲取功率因數(shù)cosφ是非常重要的,φ為電流落后或超前電壓的角度.相位φ檢測(cè)電路原理如圖5所示.

ABB 3HAB8101-1用泰勒展開式求cosφ值,顯然cosφ=1-（φ[sup]2[/sup]/2!）+（φ[sup]4[/sup]/4!）-（φ[sup]6[/sup]/6!）能保證系統(tǒng)的精度要求.亦可采用查表法計(jì)算cosφ值.在計(jì)算出cosφ的值后,還要進(jìn)一步確定φ的方向,這可由相應(yīng)的硬件與軟件配合完成.

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