Phase detecting circuit

Details Phase detecting circuit Phase detecting circuit

1979-08-15

1981-12-22

LaRoche, Eugene R.

Electricity: power supply or regulation systems

Remote sensing

323241, 328133, 324 83FE, G01R 2504

Patent

active

043073468

ABSTRACT:
Disclosed is a phase detecting circuit having first and second sets of two-phase sine wave signals each set of which has phases different from each other by 90.degree., an arithmetic operation circuit for detecting a phase difference between the two-phase sine wave signals, and a frequency variable signal generating circuit for producing an output pulse with a frequency varying in accordance with the sum of proportional and integrated values of an output signal from the arithmetic operation circuit. The phases of the sine wave signals are so changed as to minimize the phase difference. The phase detecting circuit is provided with a function generating circuit which counts the output pulses from the frequency variable signal generating circuit and produces the second set of two-phase sine wave signals with phases different from each other by 90.degree. whose phases are changed on the basis of the count data.

REFERENCES:
patent: 3953794 (1976-04-01), Moore
patent: 3956623 (1976-05-01), Clark et al.
patent: 4001680 (1977-01-01), Bylund et al.
patent: 4063146 (1977-12-01), Oliver
Floter et al., Field-Oriented Closed-Loop Control of Induction Machine with New Transvektor Control System, Siemens Review XXXIX, No. 6 (1972), pp. 248-252.

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