Frequency control circuit

Details Frequency control circuit Frequency control circuit

1984-05-24

1986-10-21

Shaw, Clifford C.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

307526, 328134, 328141, 363 98, 363132, H02M 545, H03K 372

Patent

active

046189203

ABSTRACT:
A frequency control circuit for controlling the output frequency of an inverter power pole switching arrangement produces a modified clock signal by inhibiting clock pulses of a stable clock signal in response to output pulses of a voltage controlled oscillator. The average frequency of the modified clock signal is then equal to the difference between the original clock signal and the output frequency of the voltage controlled oscillator. A control voltage which represents the difference between a normal inverter output frequency and the frequency of an external power source is used to control the output frequency of the voltage controlled oscillator.

REFERENCES:
patent: 3254314 (1966-05-01), Healey
patent: 3715649 (1973-02-01), Ravas
patent: 3866129 (1975-02-01), Cornelisson
patent: 3908132 (1975-09-01), Krampe et al.
patent: 4540945 (1985-09-01), Kuroki

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