| 摘要 |
A driver circuit for an actuator senses the phase difference between a position request signal to the actuator and a feedback signal from the actuator. A first error signal is indicative of the phase difference when the feedback signal lags the position request signal, and a second error signal is indicative of the phase difference when the feedback signal leads the position request signal. The error signals are amplified in time to provide output drive signals that control four switches which are arranged so that when certain combinations of switches are closed, the actuator will increase or decrease its position, thereby driving the error signal to ZERO. The output drive signals are limited in time so that the loss of an input (position request signal or feedback signal) does not cause an output drive signal hardover and, consequently, does not cause an actuator hardover.
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