Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1981-06-18
1983-04-26
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361152, H01H 4732
Patent
active
043815324
ABSTRACT:
A constant energy drive circuit for an electromagnetic print hammer has a chopping circuit including a comparator which cycles a switch connecting the energizing coil of the print hammer to an unregulated power supply. Changes in the drive voltage of the unregulated source are compensated for by altering the switching rate of the switch by adjusting the amplitude of a reference signal applied to the comparator. The reference signal adjustment is inverse to changes in the drive voltage.
REFERENCES:
patent: 3789272 (1974-01-01), Vollhardt
patent: 4048665 (1977-09-01), Lia et al.
IBM Technical Disclosure Bulletin, vol. 22, No. 8A, Jan. 1980, "Controller of Electromechanical Printhammer," Greer et al., pp. 3294, 3295.
Eisenzopf Reinhard J.
Gasper John S.
International Business Machines - Corporation
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