Mixed PWM/linear mode driving system employing two distinct outp

Details Mixed PWM/linear mode driving system employing two distinct outp Mixed PWM/linear mode driving system employing two distinct outp

1998-07-01

2000-02-08

Ip, Paul

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

318560, 318254, 318439, H02P 700

Patent

active

060231432

ABSTRACT:
A mixed mode PWM/Linear driving system for at least one inductive-resistive (L-R) actuator as a function of operating conditions thereof includes a first full bridge power stage including four power switching devices arranged in pairs for being driven in phase opposition. The system also includes a pulse width modulation (PWM) converter for producing a PWM signal directly driving the first full bridge power stage during a PWM mode operating phase. A second full bridge power stage also comprises four power switching devices of different electrical characteristics from the power switching devices of the first full bridge power stage. The system further includes a pair of amplifiers connected to respective pairs of power switching devices of the second full bridge power stage for driving same in phase opposition during a linear mode operating phase. A switch is provided for switching between the PWM mode operating phase and the linear mode operating phase.

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