Periodic signal controller

Details Periodic signal controller Periodic signal controller

2005-05-10

2005-05-10

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S141000

Reexamination Certificate

active

06891413

ABSTRACT:
In a periodic signal controller of the present invention, a first phase difference detection circuit1and a first sine-wave signal generation circuit2constitute a phase-locked loop for processing instantaneous values. A frequency difference detection circuit4determines a frequency difference between AC input and output signals, using instantaneous values of a first sine-wave signal output from the first sine-wave generation circuit2and a second sine-wave signal output from a second sine-wave signal generation circuit9.A second phase difference detection circuit3determines a phase difference between the first and second sine-wave signals. An adder circuit5adds a phase difference detection signal to a frequency difference detection signal. A frequency variation rate limiter circuit8receives an output of the adder circuit5to limit a frequency variation rate of the second sine-wave signal to a fixed value or less, and also outputs to the second sine-wave signal generation circuit9a command signal for synchronizing the second sine-wave signal to the AC input signal. With this arrangement, even if the AC input signal includes a harmonic voltage, a sine-wave AC output signal synchronized with the AC input signal is generated.

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