Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Boost Converter Output Voltage Overshoot

Status
Not open for further replies.

mengghee

Full Member level 3
Joined
Nov 29, 2005
Messages
164
Helped
8
Reputation
16
Reaction score
5
Trophy points
1,298
Location
United Kingdom
Activity points
3,112
hiye everybody,

I am just wondering why is there an overshoot with my output voltage of my boost converter when my capacitor is smaller. and also, if i increase the size of the capacitor, the overshoot will reduce but my simulation time for it to reach steady state will be longer. why is that ? thank you

regards,
mengghee
 

v_c

Advanced Member level 2
Joined
Oct 11, 2005
Messages
514
Helped
113
Reputation
226
Reaction score
37
Trophy points
1,308
Location
Chicago, IL, USA
Activity points
8,229
With a smaller capacitor, it takes much shorter time to move the output voltage toward your set point. With a smaller capacitor, the lowpass filter formed by the output inductor and capacitor has a corner frequency larger than if the output cap was larger. This means that the output regulation will be more sloppy since you are letting more switching noise go into the controller.

When you increase the output filter capacitor, the lowpass filter has a much lower frequency so you get much lower ripple on the output and better regulation. However since the output capacitor is larger, it takes much more time to charge it to its equilibrium value. This means that you need to simulate more cycles until you see steady-state.

I hope this helps you out.

Best regards,
v_c
 

    mengghee

    points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top