Circuit for driving double-stage high-pressure injection magnetic valve for fuel injection charges one of two coils connected as preparation coil during preparation period

摘要

The circuit has two magnetic coils (L1,L2) in series supplied with current from a common booster switch (S2), a booster capacitor (Cboost), a low side switch (S1) and a high side switch (S3) for opening and closing the valve. During a preparation period with the booster switch open and the low side switch closed, one of the two coils, which is connected as a preparation coil at one end to the battery voltage and at the other to the booster capacitor and switch, is charged with energy.