Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1995-07-14
1998-04-07
Fleming, Fritz
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361187, 307128, H01H 4704
Patent
active
057371725
ABSTRACT:
An electromagnetic contactor to which voltage generated through full wave rectification of an alternating current or DC voltage is loaded. The device provides control for a closing operation with a large pulse width according to a set-up frequency and control for maintaining the closed state of the electromagnetic contactor with a small pulse width for executing ON/OFF control. The device comprises a detector for detecting a peak voltage value of the voltage subjected to full wave rectification and an average value or an effective value thereof and a controller for stabilizing the input at a constant level by controlling a pulse width of a frequency set up based on a voltage value detected by the detector.
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Fleming Fritz
Mitsubishi Denki & Kabushiki Kaisha
Mitsubishi Electric Engineering Co. Ltd.
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