huashizng
Newbie level 6
+understanding of loop compensation
Hi, all
i am simulating the simple model of a voltage mode boost DCDC with 200mA load. but i met some problems in loop stabillity.
In this structure, according to my understanding, LC filter network will produce two poles, output capacitor and load also bring a pole. At the same time, the boost structure will introduce an inevitable RHP zero. It seems it is hard to compensate the whole voltage loop only by the Ccomp and Rcomp. Do you have any suggestion on the loop compensation?
p.s.: if anyone know how to build AC model for the switch part of the boost voltage mode structure?
Any help or comments would be very appreciated.
Added after 2 minutes:
sorry, i forgot to attach the circuit
https://obrazki.elektroda.pl/68_1185441781.jpg
Hi, all
i am simulating the simple model of a voltage mode boost DCDC with 200mA load. but i met some problems in loop stabillity.
In this structure, according to my understanding, LC filter network will produce two poles, output capacitor and load also bring a pole. At the same time, the boost structure will introduce an inevitable RHP zero. It seems it is hard to compensate the whole voltage loop only by the Ccomp and Rcomp. Do you have any suggestion on the loop compensation?
p.s.: if anyone know how to build AC model for the switch part of the boost voltage mode structure?
Any help or comments would be very appreciated.
Added after 2 minutes:
sorry, i forgot to attach the circuit
https://obrazki.elektroda.pl/68_1185441781.jpg