Device for progressive electrical switching

Details Device for progressive electrical switching Device for progressive electrical switching

1977-10-11

1980-05-27

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307251, 307243, 328104, H03K 1700

Patent

active

042052408

ABSTRACT:
The switching device delivers an electrical output signal having a mean amplitude which changes progressively from the amplitude of a first signal to that of a second signal. One control signal produced by a logical unit is applied to each control input of a switching unit for closing or opening the switches of the switching unit. The control signal is given a first logical level during a first period and a second logical level during a second period. During an intermediate "switching" period the signal is given alternately the first logical level and the second logical level with a predetermined frequency. The time-duration of the half-waves of the first logical level thus decreases progressively when passing from the first period to the second period.

REFERENCES:
patent: 3854117 (1974-12-01), Fothergill
patent: 4010385 (1977-03-01), Krol

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