Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1982-07-19
1984-06-12
Miller, Jr., George H.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361155, 361156, 323282, H01H 4722
Patent
active
044545584
ABSTRACT:
A solenoid drive circuit for a matrix printer comprises a capacitor (C1) connected in parallel with the series arrangement of a first diode (D2), the solenoid coil (L1), and the collector-emitter path of a transistor (T1). A second diode (D3) is connected in parallel with the coil (L1) and transistor (T1). The capacitor is charged from a d.c. supply which includes a switching regulator (10, T10) via a diode (D1). When the transistor is switched ON by a print signal applied to a terminal (4) the capacitor is discharged resonantly into the coil. The first diode (D2) prevents current flow from the solenoid to the capacitor during the negative half cycle of the resonant frequency so that 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 (D4) into the storage capacitor (C10) 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 (10) to switch OFF transistor (T10) during the print operation.
REFERENCES:
patent: Re30150 (1979-11-01), Puoogel
patent: 4016461 (1977-04-01), Roland
IBM Technical Disclosure, vol. 12, No. 7, Dec. 1969, pp. 963-964, "Capacitor Discharge Print Wire Drive" by Boothroyd.
"Current Capacity of Three-Terminal Regulator Expands Fivefold" by Houer, Electronic Design, vol. 27, Dec. 20, 1979, p. 94.
Franzblau Bernard
Jennings Derek
Mayer Robert T.
Miller Jr. George H.
U.S. Philips Corporation
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