Boost Regulators

Two modes:

1. Mode 1: switch closed

2. Mode 2: switch open

Assumptions:

1. Steady-state conditions exist
2. Switching period is T; switch is closed for kT, open for (1-k)T
3. Inductor current never goes to 0
4. Capacitor is very large, since Cdv/dt=iL, and iL bounded, dv/dt must be small =>> v₀ is constant.

 

The switch is implemented by a PWM-transistor & IGBT/MOSFET circuit. So we get a periodic switching.

 

Mode 1: switch closed

 

Mode 2: switch open

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