Circuit for monitoring the frequency of signal for controlling c

Details Circuit for monitoring the frequency of signal for controlling c Circuit for monitoring the frequency of signal for controlling c

1983-01-03

1986-01-14

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340658, 328133, 307526, H04Q 900, H03K 706, G08B 2100

Patent

active

045648379

ABSTRACT:
A circuit is disclosed for monitoring the frequency of a signal for controlling choppers of electric cars. The phase of the control signal is compared by a comparator with the phase of a reference frequency signal produced by a reference-frequency signal generator. When the phase difference which is greater than a predetermined value is sustained continuously for more than a predetermined period of time, an alarm is produced.

REFERENCES:
patent: 3971994 (1976-07-01), Sheperd
patent: 4002314 (1977-01-01), Barpal
patent: 4417229 (1983-11-01), Wilson
patent: 4442406 (1984-04-01), Voss
patent: 4465977 (1984-08-01), Romana

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