High accuracy tachometer circuit

Details High accuracy tachometer circuit High accuracy tachometer circuit

1986-09-19

1987-11-10

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307529, 307525, 307512, 328144, 328158, 324166, G06G 720

Patent

active

047059699

ABSTRACT:
A tachometer circuit is described that has a zero ripple d-c output that is directly proportional to the frequency. The circuit includes a pair of full wave rectifiers to act upon the sine and cosine signal inputs. The rectified currents are first squared, then summed together and finally the square root is taken. Since the quantity .sqroot.sine.sup.2 +cosine.sup.2 is a constant, there is no ripple and no output filtering is required to eliminate ripple. This means that the output can follow very rapid changes in frequency and no lag is introduced by the inclusion of low pass signal filtering.

REFERENCES:
patent: 3872388 (1975-03-01), James
patent: 4088960 (1978-05-01), Osborne
patent: 4506174 (1985-03-01), Hitt

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