US 2009/0099704 A1 · DIGITAL CONTROLLER

Abstract

There is provided a digital controller which can generate no oscillation even if sensing a load side and enables control of supplying a desired voltage to the load. In an power amplifier which supplies an output voltage vo to the load connected via a load connecting line, a load voltage vL and the output voltage vo are periodically sampled to calculate a manipulating variable ξ1 from the output voltage vo, the load voltage vL and an arbitrary target value r. Based on the manipulating variable ξ1 calculated, a control signal is output to the power amplifier. As a result, when connecting an LC filter with a load device 9 of the power amplifier intended for a control target and besides the load connecting line is long, a robust digital controller without generating oscillation even if sensing the load side is performed can be realized.

Claims22

Dependent claims

A digital controller which supplies an output voltage vo to load connected via a load connecting line and is incorporated in an power amplifier, wherein said digital controller is equipped with a manipulating variable calculator to which said output voltage vo, a load voltage vL that is a voltage across said load and an arbitrary target value r are input and which calculates a manipulating variable ξ1 (xi1) for said power amplifier and according to the following formula 1

ξ
1
=
1
z

(
z
-
F
16
)
-
F
15

{
[
(
z
-
F
16
)

F
12
+
F
14
]

v
o
+
[
(
z
-
F
16
)

F
112
+
F
132
]

v
L
+
k
z
z
-
1

[
(
z
-
F
16
)

H
+
H
r
]

(
r
-
v
L
)
+
[
(
z
-
F
16
)

H
+
H
r
]

r
}
[
Formula


1
]
(where z=exp(jωt), and H, Hr are poles of transfer functions specified between said target value r and a control variable y and kz, F12, F14, F15, F16, F112, F132 are preset given parameters) said manipulating variable calculator calculates said manipulating variable ξ1.

100 more elements

Dependencies are inferred from the claim text.

Digital controller

Life of this patent

Digital controller

Life of this patent

Abstract

Claims22