Control system for motors and inductive loads

Details Control system for motors and inductive loads Control system for motors and inductive loads

1992-08-24

1995-04-11

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

318599, 327 87, 327427, H03K 17687

Patent

active

054061504

ABSTRACT:
The present invention provides a system for controlling current through inductive elements by automatically switching between a pulse width modulation mode and a linear mode, depending upon the current demands of the inductive elements. A time-base circuit provides periodic pulses that allow current to flow through an inductive device. The current through the inductive device increases over time. If the current through the inductive device exceeds a specified value, the current is shut off until the next pulse from the time-base circuit. After the power supply current has been shut off, current through the inductive device continues to flow through flyback diodes, gradually decreasing over time. Another pulse is provided by the time-base circuit before the current is allowed to reach zero. By controlling the duration and rate of increase and decrease of current through the inductive device, a method of current control for inductive elements has been provided.

REFERENCES:
patent: 4446440 (1984-05-01), Bell
patent: 4469082 (1984-09-01), Nishitoba et al.
patent: 4591767 (1986-05-01), Koide
patent: 4607210 (1986-08-01), Ohms et al.
patent: 4791350 (1988-12-01), Roof
patent: 4904889 (1990-02-01), Chieli
patent: 4985687 (1991-01-01), Long
patent: 5045766 (1991-09-01), Vermersh
patent: 5061863 (1991-10-01), Mori et al.
patent: 5099138 (1992-03-01), Fukunaga

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