Circuit for driving reel motor of videotape recorder

Details Circuit for driving reel motor of videotape recorder Circuit for driving reel motor of videotape recorder

1992-05-18

1994-03-01

Shoop, Jr., William M.

Electricity: motive power systems

Constant motor current, load and/or torque control

388821, 388930, A02P 700

Patent

active

052911071

ABSTRACT:
A load driving circuit causes a driving current to flow through a load, such as a reel motor, an audio load or the like through the collector and emitter of a drive transistor. A load voltage which changes according to changes in the driving current is obtained at a point of connection between the drive transistor and the load. On the basis of the load voltage, an offset voltage having a predetermined constant value is generated in a power supplying circuit so as to cancel a change in the load voltage. The offset voltage is supplied as driving source output to the drive transistor so as to prevent the generation of excess heat in the drive transistor even if the driving current changes.

REFERENCES:
patent: 4218730 (1980-08-01), Marumoto et al.
patent: 4525658 (1985-06-01), Yanagida
patent: 4933614 (1990-06-01), Kamata

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