Combination feedback controller and power regulator using same

Details Combination feedback controller and power regulator using same Combination feedback controller and power regulator using same

2007-05-01

2007-05-01

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

With automatic voltage magnitude control

C363S041000, C363S163000, C307S045000, C307S064000

Reexamination Certificate

active

11080584

ABSTRACT:
A combination controller incorporates features of a classic controller and a state space controller to function as a hybrid controller unit. The PID portion of the classic controller regulates the steady state error and is separated from the pulse width modulated constant frequency signal generator that also comprises part of the classic controller. The PID portion is coupled with a state space controller such that the output of the PID controller, i.e., the steady state error correction, is input to the state space controller. The state space controller further receives as input variables a reference sinusoidal signal, the load current, the current across a pre-load filter capacitor, and the output voltage. From these inputs, the state space controller employs principles of differential calculus to generate a transient error correction that is fed to a PWM signal generator for generating a sinusoidal output voltage signal with both steady state and transient error correction. The sinusoidal output voltage signal is directed to a power amplifier and filtered for delivery to a connected load. The combination controller is thusly incorporated into an electrical feedback system such as a frequency converter, a power conditioner, and an uninterruptible power supply (UPS).

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