| 摘要 |
In a pulse width modulated control circuit for a double solenoid valve, each of the solenoid circuits contains a sensing resistor to provide a signal corresponding to the current through the associated solenoid. The two signals so obtained are applied to a differential amplifier whose output constitutes a feedback signal proportional to the net difference between the solenoid currents, and hence between the solenoid forces. A common mode bias current and a dither signal may be applied to the solenoids to respectively improve linear response in the null region, and to reduce hysteresis. |
