1、文書#借鑒1power supply projectagilent 6612c (keysight 6612c) power supply replacement.文書#借鑒2內容feature .3key parts .4opa547t to220.4arduino mega-2560.5arduino mega2560 extension board (shield) (mega2560 擴展板).7ina219 power monitor.8lcd display i2c.10to220 散熱片.10dc power supply .11bom.12schematic.13opamp o

2、pa547.14i_lim formula.14vout formula:.15arduino board connection.16current limit calibration.17wire soldering .錯誤錯誤! 尚未定義書籤。尚未定義書籤。calibration.23test equipment requirement: .23calibration procedure.23文書#借鑒3featurescpi command supportinterface: com port (protocol: 9600,n, 8,1 )voltage output: 09vcurr

3、ent output: 0200ma ( max 500ma but need heat sinking solution)measurement capability:hight +26v 1alow 16v, 400mameasure speed: +2.4 v (working mode)v_+e/s low (output disabled) e/s pin forced low (v) +0.8 v (thermal shutdown status) e/s pin force low to disable output文書#借鑒18current limit calibration

4、i_lim=(vbase-vadc)*ratex=vbasey= ratei_lim= (x- vadc ) *yset device:volt 2vout 1debug:1pwm:3: 714 ( expect around 200ma current limit.) record current by current meter. (i_200ma)pwm:3 843 ( expect around 100ma current limit.) record current by current meter. (i_100ma)put equation in website i_200ma=

5、(x-714)*y , i_100ma=(x-843)*yto get x and y value.case 1: i_200ma= 142mai_100ma=77.8ma142=(x714)ya= i200ma actual measurement current under 200ma settingb= i100ma actual measurement current under 100ma setting =( 843 714 ) = ( 843 714)文書#借鑒1977.8=(x843)yx=999.33, y=0.4977put both value in fw code ad

6、c_base =x , rate=y文書#借鑒20wire solderingpictures文書#借鑒21文書#借鑒22文書#借鑒23文書#借鑒24文書#借鑒25usb extension cablecalibration calibration procedure implemented in gts scrip file.test equipment requirement: 1: voltage meter文書#借鑒262: current meter (range 0 200ma)3 dut (with external power plug 12v/ 2a)calibration procedure 儀器準備 :電流表電流表 0200ma 電流表電流表 ( 需要越精準越好需要越精準越好)步驟run scrip file. maetay6612_calibration.xmz (需安裝需安裝 gts )先不掛上 電流表程式會自動挑整電壓到 5v 按照指示 (apply current meter) 掛上 電流表( 一端接地 一端接輸出 ) 使其輸出大電流進入電流保護 狀態輸入電流表讀到的電流值 (ma) 70100 左右輸入完 按 enter再次 輸入電流表讀到的電流值 (ma) 1401