current mode control of boost converter

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mess123

Joined: 30 Nov 2008
Posts: 38
Helped: 3

03 Nov 2009 18:33 current mode control of boost converter

Can anybody explain me why "the differnce between Vref and Vo" becomes the Iref in the current mode control of dc dc converter?

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eem2am

Joined: 22 Jun 2008
Posts: 753
Helped: 13

03 Nov 2009 19:17 current mode control of boost converter

that difference is the "error".

in Voltage mode, you have a ramp produced by an oscillator, in Currenct mode, its the same (similar) , except the ramp is gotten from the current sense resistor voltage

Added after 20 minutes:

somethings gotta turn off the switch, and turn it off at the right time, so the output off the error amp sets the current sense trip point.

so the more energy u need passed to the output , the longer the switch is on.