Digital Robust Control for DC-DC Converter with Second-Order Differential Characteristics
| Paper File | Download Paper File | | Appear In | ECTI Transaction EEC (ECTI Transaction EEC) | | Publication Date | 01/08/2009 - 28/08/2009 | | Volume | 7 | | Pages | 161 - 169 | | No | 2 | | Author 1 | Kohji Higuchi | | Author 2 | Eiji Takegami | | Author 3 | Kazushi Nakano | | Author 4 | Tatsuyoshi Kajikawa | | Author 5 | Satoshi Tomioka | | Author 6 | Kosin Chamnongthai |
Abstract
Robust DC-DC converter which can covers exten-
sive load changes and also input voltage changes with
one controller is needed. The demand to suppressing
output voltage changes becomes still severer. We pro-
posed an approximate 2DOF digital controller which
realizes the startup response and dynamic load re-
sponse independently. The controller makes the con-
trol bandwidth wider, and at the same time makes
a variation of the output voltage small at sudden
changes of loads and input voltages. In this paper, a
new approximate 2DOF digital control system with
additional zeros is proposed. Using additinal zeros
second-order di®erential transfer characteristics be-
tween equivalent disturbances and an output volt-
age are realized. Therefore the new controller makes
variations of the output voltage smalerl at sudden
changes of loads and input voltages. This controller
is actually implemented on a DSP and is connected
to a DC-DC converter. Experimental studies demon-
strate that this type of digital controller can satisfy
given severe speci¯cations. |
