Electricity: motive power systems – With particular motor-driven load device – Tension-maintaining type of motor-control system
Patent
1988-12-30
1991-02-26
Ro, Bentsu
Electricity: motive power systems
With particular motor-driven load device
Tension-maintaining type of motor-control system
318 7, B65H 5938
Patent
active
049964666
ABSTRACT:
A tape-tension control circuit for preventing an over-voltage from being applied by a phase locked loop (PPL) to drive a reel motor for use in a video recording/reproducing apparatus upon selection of an initial search operation. First multiplexer 10 outputs selectively a frequency signal according to the rotation of a take-up reel or a supply reel thereof. Control circuit 20 synthesizes the output of the first multiplexor with a bias voltage to drive the reel motor at the least speed. Second multiplexor 50 receives at each input the synthesized output of the control circuit 20, and the phase-locked-loop output of the first multiplexor 10. The second multiplexor 50 consequently outputs control signals to control the operation of motor driver coupled to a reel motor. Comparator 40 compares the synthesized output of the control circuit 20 with a specified reference voltage, thereby controlling the multiplexing operation of the second multiplexor 50.
REFERENCES:
patent: 4126817 (1978-11-01), Luzio
patent: 4156257 (1979-05-01), Roberts
patent: 4160195 (1979-07-01), Sakamoto
patent: 4540920 (1985-09-01), Cutler et al.
patent: 4777413 (1988-10-01), Yoshimura et al.
patent: 4788606 (1988-11-01), Uchikoshi
Bushnell Robert E.
Ro Bentsu
SamSung Electronics, Ltd.
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