A comparison of multirate digital compensators for a battery charger

Abstract

In a regulation application, a power supply is typically tasked with maintaining a fixed1 voltage or current in the face of possible disturbances. In a tnzcking application, on the other hand, a controller works to cause an average output voltage or current to follow a desired reference waveform as a function of time or some other variable. This paper describes a large-signal linear, multirate digital controller for, among other possible applications, charging electric vehicle batteries. This controller permits the charger to track and deliver a desired current trajectory for a wide range of loads while providing a unity-power-factor interface to the electric utility.

High-frequency digital PWM controller IC for DC-DC converters

“…For example (2) where , , and are constants, corresponds to the basic PID controller. Similar discrete-time control laws have been used in other applications of digital control for switching power converters [1], [7], [8], [19].…”

“…IGITAL controllers can offer a number of advantages in dc-dc power converters, and various analysis, design and implementation aspects of this emerging area are receiving increasing attention [1]- [17]. Advanced power management techniques rely on integration of power control and conversion functions with digital systems [2]- [5].…”

Adaptive control of power electronic drives for servomechanical systems

“…In [10]- [12], we exploited large-signal linear models for developing controllers for the inductively-coupled power electronic drives used in [3]. Large-signal linear models are essential for developing controllers with verifiable performance in tracking applications.…”

“…Large-signal linear models are essential for developing controllers with verifiable performance in tracking applications. The general multirate digital control techniques developed in [3], [11], and [12], and presume that the driving-point impedance or other input-to-output behavior of the load can be described by a linear, time-invariant transfer-function model. The time invariance constraint implies that the differential equations or transfer function describing the load model contains constant coefficients.…”

“…2 that relates the -transform of output temperature to the -transform of the input voltage command from the PP temperature compensator. With the ZOH configuration, can be found by applying a step-invariant CT-to-DT transformation [14] to the transfer function (12) where (13) The DT transfer function (12) relates -transforms of the commanded power and the sampled temperature . The DT load model in (12) can now be used to design a DT compensator which yields the desired closed-loop performance.…”