Stepping motor driving circuit having failsafe function

Details Stepping motor driving circuit having failsafe function Stepping motor driving circuit having failsafe function

1991-07-25

1992-09-15

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

051480921

ABSTRACT:
A driving circuit for driving a stepping motor has a plurality of excitation coils, a plurality of excitation transistors for driving the excitation coils of the stepping motor, respectively, at least one chopping transistor for effecting chopping control of current flowing to the excitation coils, and a CPU for supplying at least one control signal to the at least one chopping transistor. High and low pulse duty factor detecting circuits detect whether the at least one control signal has a pulse duty factor thereof falling outside a predetermined range defined by predetermined upper and lower limit values. The CPU is responsive to outputs from the high and low pulse duty factor detecting circuits for interrupting the supply of current to the stepping motor when the latter detect that the pulse duty factor falls outside the predetermined range.

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