Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1997-06-16
1999-09-14
Fleming, Fritz
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361159, 361152, 361160, H01H 4704
Patent
active
059531983
ABSTRACT:
An electromagnet drive apparatus being characterized by a switching element 1 connected in series with a coil 3 of an electromagnet; a pulse signal generation circuit 16 which generates, on predetermined cycles, a pulse signal used for turning on the switching element; a regenerative circuit 4 which permits flow of a regenerated electrical current when the switch section is turned on and the switching element is turned off from a state in which the switch section and the switching element are in an on state and a source voltage is applied to the coil of the electromagnet, and which causes the power absorbing element to immediately reduce the regenerated electrical current flowing through the coil of the electromagnet when the switch section and the switching element are turned off; and a delay circuit 11 which turns on the switch section by application of the supply voltage and maintains the switch section in an on state until a predetermined period of time elapses after the application of the supply voltage has been stopped.
REFERENCES:
patent: 5557494 (1996-09-01), Ishikawa et al.
Akinari Yoshinori
Murata Yukihiro
Fleming Fritz
Matsushita Electric & Works Ltd.
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