DC motor drive control with improved current sensing

Details DC motor drive control with improved current sensing DC motor drive control with improved current sensing

1998-06-18

2000-04-25

Ro, Bentsu

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

318432, H02P 729

Patent

active

060553596

ABSTRACT:
A PWM DC motor control circuit having improved current sensing. A power switching device controls the DC motor in a common drain connection, whereby armature current sensing is achieved at the negative side of the power switching device. The control for the power switching device and the PWM control circuit are both referenced to the negative rail, and thus do not float or move up and down with the motor modulation. An RC combination is controllably and synchronously switched across the current sense resistor to produce a voltage Ve across the RC combination when the motor power switch is on. This RC combination provides an average voltage of Ve to the PWM control that provides a waveform that replicates very nearly the armature motor current. The DC motor control current has improved immunity to noise generated by the PWM control and other ambient noise.

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