472 Lecture 11 current mode control

472 Lecture 11 current mode control - Lecture 11 Current...

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Lecture 13a 1 Lecture 11 Current mode control • Average current mode control • Peak current mode control – most popular • Slope compensation • Controller design • Current sharing in parallel converters EEE 498/591 – Raja Ayyanar
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Lecture 13a 2 Advantages of current mode control • Simpler controller design (current needs to be sensed anyway for protection) • Effective means to achieve load sharing in parallel converters • Easy over current protection (cycle by cycle protection in peak current mode) • Automatic input voltage feed forward feature in peak current mode EEE 498/591 – Raja Ayyanar
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Lecture 13a 3 + PWM Voltage Controller + _ V o,ref V o v c ( t ) d ( t ) v err ( t ) Voltage mode control Average current mode control • Outer voltage loop – provides current reference • Inner average current loop – controls duty ratio • Conventional PWM to generate gate drive + PWM Voltage Controller + _ V o,ref V o d ( t ) v err ( t ) Average current mode control Current Controller i L,ref i L v c ( t ) EEE 498/591 – Raja Ayyanar
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472 Lecture 11 current mode control - Lecture 11 Current...

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