H - Electricity – 02 – K
Patent
H - Electricity
02
K
318/1
H02K 41/00 (2006.01) B41J 2/30 (2006.01) B41J 9/26 (2006.01) H01F 7/18 (2006.01)
Patent
CA 1183198
ABSTRACT: A solenoid drive circuit for an impact printer comprises a capacitor which is connected in parallel with the series arrangement of a first diode, the solenoid coil, and the base-emitter path of a transistor. A second diode is connected in parallel with the coil and the tran- sistor. The capacitor is charged from a d.c. supply, which includes a switching regulator, via diode. When the transistor is switched ON by a printer signal applied to a terminal the capacitor is discharged resonantly into the coil. The first diode prevents the negative half cycle of the resonant frequency and current in the coil circulates in the loop formed by the coil the transistor and the second diode when the transistor is switched OFF the current flowing in the coil is discharged via a further diode into the reservoir capacitors of the d.c. power supply to increase the efficiency of the drive circuit. The print signal is also fed to an inhibit input of the pulse width modulator to switch OFF a further transistor in the switch- ing regulator during the print operation.
408427
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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