Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1995-06-07
1997-11-18
Masih, Karen
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318254, 318138, 318439, G05B 1128
Patent
active
056891628
ABSTRACT:
A motor drive control circuit for operation in the PWM mode includes a feedack circuit from a resistor for sensing motor coil current modified to switchably connect the resistor to the drive input in accordance with operation of a sample-hold switch. The sample-hold switch is controlled to sample a signal proportional to motor coil current only at the middle of the coil current rise during each PWM ON time, thus providing a reliable indication of average coil current. A signal storage capacitor connected in the feedback circuit receives the sampled signal and retains it for use in feedback control throughout PWM operation until the next sample.
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Galanthay Theodore E.
Jorgenson Lisa K.
Masih Karen
SGS-Thomson Microelectronics Inc.
Telfer Gordon H.
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