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ID:41119549
大小:1.65 MB
页数:6页
时间:2019-08-16
《同步整流原理》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、SR(同步整流)circuit動作原理一、正常時之動作原理+-+-於滿載時:1.當Q050OFF,Q204OFF,Q206ON,D203導通,Q203ON,電流得以流經R203使Q200ON。P.62.當Q050ON,L200產生反偏壓,電流方向相反,使得Q204ON,將Q200之Vds接至等電位,因此Q200無法導通,成OFF狀態。於輕載時:1.當Q050OFF,Q204OFF,但Q206Vds電壓不足以將Q206ON,因此D203OFF,Q203OFF,電流無法流過,使Q200OFF。P.6二、當ZD200short之動作原理於滿載時:1.當Q0
2、50OFF,Q204OFF,Q206ON,D203導通,Q203ON,電流得以流經R203使Q200ON。2.當Q050ON,原本Q204必須ON,將Q200OFF,但由於ZD204零件short,使得Q204無法ON,造成Q200依然ON。整個控制線路不正常,原本的工作頻率70KHz也變成16KHz。P.6TestConditions=>PSUisworkingnormallyInputVoltage=220V/50Hz(CH1)Q050Voltage=642V(CH2)Q050Current=1.305ATestConditions=>OpenR
3、053InputVoltage=220V/50Hz(CH1)Q050Voltage=677.5V(CH2)Q050Current=1.317ATestConditions=>PSUisworkingnormallyInputVoltage=220V/50Hz(CH1)Q050Voltage=642V(CH2)Q050Current=1.305ATestConditions=>ShortZD200InputVoltage=220V/50Hz(CH1)Q050Voltage=579.6V(CH2)Q050Current=1.132AP.6TestCond
4、itions=>PSUisworkingnormallyInputVoltage=220V/50Hz(CH1)Q050Voltage=642V(CH2)Q050Current=1.305ATestConditions=>OpenR053andShortZD200InputVoltage=220V/50Hz(CH1)Q050Voltage=584.0V(CH2)Q050Current=1.235ATestConditions=>PSUisworkingnormallyInputVoltage=220V/50Hz(CH1)Q200Voltage=96.5
5、V(CH2)Q200Current=2.253ATestConditions=>OpenR053InputVoltage=220V/50Hz(CH1)Q200Voltage=96.34V(CH2)Q200Current=2.256AP.6TestConditions=>PSUisworkingnormallyInputVoltage=220V/50Hz(CH1)Q200Voltage=96.5V(CH2)Q200Current=2.253ATestConditions=>ShortZD200InputVoltage=220V/50Hz(CH1)Q20
6、0Voltage=78.84V(CH2)Q200Current=4.047ATestConditions=>PSUisworkingnormallyInputVoltage=220V/50Hz(CH1)Q200Voltage=96.5V(CH2)Q200Current=2.253ATestConditions=>OpenR053andShortZD200InputVoltage=220V/50Hz(CH1)Q200Voltage=74.95V(CH2)Q200Current=4.049AP.6
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