US 2008/0278979 A1 · n-Buck cascade converter with single active switch

Abstract

An n-buck cascade converter, where the DC conversion ratio is Un where U is the duty ratio. The converter comprises n inductors, n capacitors, (2n-1) diodes and a MOSFET transistor. The cascading configuration uses the minimum number of active switches while avoiding complex control circuitry. It is assumed that this converter operates in continuous condition mode, i.e., all the inductor currents never decay to zero. The corresponding formulae for the ripples in the capacitor voltages and the inductor currents are given. This allows designing in principle a specific converter following some specifications.

Claims10

Dependent claims

An n-buck cascade converter comprising:

n inductors L1, L2, . . . , Ln;
n capacitors C1, C2, . . . , Cn;
(2n-1) diodes D1, D2, . . . , D2n-1;
and,
a single MOSFET transistor S operating as an active switch, where the converter is operated at a constant switching frequency, said inductors, capacitors, diodes and transistor arranged in a circuit as shown below:
where E is the input voltage and R is a load.

3 more elements

Dependencies are inferred from the claim text.

n-Buck cascade converter with single active switch

Life of this patent

n-Buck cascade converter with single active switch

Life of this patent

Abstract

Claims10