Control circuit for electromagnetic valve adds derived current to voltage-current converter output when rectangular pulse current is switched off

摘要

The control circuit has a current-to-voltage converter (9), a low pass filter (10), an error amplifier (11), a chopper wave generator (4), a PWM comparator (5) and a driver stage (7). The circuit has a device (12) for adding a voltage equal to the output voltage of the current-voltage converter, which is derived by converting the current flowing to the solenoid via a protective diode when the rectangular pulse current is off into a voltage from the current -voltage converter, to the rectangular pulse voltage forming the output of the current-voltage converter.