Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1988-08-12
1991-01-29
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361152, H01F 718
Patent
active
049891162
ABSTRACT:
A chopper circuit is provided for driving of electromagnets and/or step motor coils (8;26) in particular for a matrix printer, where the inductivity of the coil generates in connection with the applied voltage a maximum current, which current, however, is set lower by desired factor, whereby the current ripples (7a) are generated by chopping. These current ripples (7a) can be changed, that is, set to an optimum value depending on frequency inductivity and resistance of an electromagnetic coil (8) or, respectively, of a magnet coil winding (26). A driver circuit (9) for the electromagnetic coil (8) or, respectively, bridge circuit (27) for the step motor coil (26) have coordinated current data acquistion (10) with a current shut-off (11) in each case and that a digital control logic (12) is provided, which control logic generates a control signal (2) in the cycle of a shunted frequency generator, where the control signal (2) is present as an input and output signal at the input (13) of the driver circuit (9) or, respectively, of the bridge circuit, alternating with the current shut-off (11).
Gruner Manfred
Riedl Franz
Gaffin Jeffrey A.
Kasper Horst M.
Mannesmann Aktiengesellschaft
Pellinen A. D.
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