Control circuit for a controller for use with a controlled eleme

Details Control circuit for a controller for use with a controlled eleme Control circuit for a controller for use with a controlled eleme

1988-05-17

1989-10-17

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318280, 318293, 318558, H02P 122

Patent

active

048749940

ABSTRACT:
To control a reversible element (E), such as a motor and especially a motor operating a tape recorder tape transport, actual operating level input signals in form of timed pulses, depending on speed, and operating sign input signals are applied to a controller (8) through a frequency measuring circuit (5). The controller (8) compares the command level input signal and the actual input signal and provides corresponding error or control output signals. In accordance with the invention, a switch or gate (6) is interposed between the actual operating level input and a frequency measuring circuit (5) which, in turn, controls the controller, the gate or switch being conductive if and only if the sign of the actual operating signal and the sign of the command signal agree, as determined by an antivalence or AND-function gate (7). Upon disagreement of the sign signals, the gate is opened. A transfer switch (10) controlled by the command sign input (3) selectively transfers the output from the controller (8) either directly or through an inverter (11) to the controlled element (E).

REFERENCES:
patent: 4259625 (1981-03-01), Hatakeyama et al.
patent: 4629949 (1986-12-01), Senso
patent: 4658192 (1987-04-01), Casteel et al.

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