环路理论分析和测试.ppt
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1、 Basic Loop/Gain theory and measurement for power converterR&D/SPS training course present by Sakda.S 1Delta Electronics(Thailand)Public Co.,Ltd.1.Stable/Unstable condition2Delta Electronics(Thailand)Public Co.,Ltd.1.1 Negative feedback and unstable conditionT(s)=C(s)1+C(s).H(s)The system get unstab
2、le when denominator=0,T(s)=infinity.So,C(s).H(s)=-1 unstable3Delta Electronics(Thailand)Public Co.,Ltd.Consider term C(s).H(s)=-1 in unstable condition.Therefore,C(s).H(s)=1 and (C(s).H(s)180 So,If we would like to avoid the unstable condition in a system,we have to avoid both events above.The term
3、C(s).H(s)are usually called“LOOPGAIN”or“OPEN-LOOP GAIN”.4Delta Electronics(Thailand)Public Co.,Ltd.Phase margin and Gain marginTo ensure a system is stable in all condition,The loop gain must have “Phase”180 at Gain=0dB “Gain”45Gain margin should be 10 dB7Delta Electronics(Thailand)Public Co.,Ltd.Design requirement for Cut-off frequency,fcfc 45 degree.Gain margin should be 10 dB.BW should be 1/10 switching frequency.Phase margin and band width(fc)can be effect to dynamic load response of power supply.18Delta Electronics(Thailand)Public Co.,Ltd.
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- 环路 理论 分析 测试
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