Drive circuit of direct-current voltage-driven magnetic...

Details Drive circuit of direct-current voltage-driven magnetic... Drive circuit of direct-current voltage-driven magnetic...

2008-05-06

2008-05-06

Deberadinis, Robert L. (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

C361S154000, C361S155000, C361S160000

Reexamination Certificate

active

07369391

ABSTRACT:
In a direct-current voltage-driven magnetic contactor, a main contact is in an open circuit condition in an attraction period of an initial period of excitation by an operating coil, and in a closed circuit condition in a subsequent holding period, and a drive circuit includes a direct-current power supply voltage detecting circuit that gives a start signal when an applied voltage of a exciting direct-current power supply exceeds a predetermined value, a first drive circuit that makes a starting semiconductor switching element perform an ON operation on receiving the start signal, and a second drive circuit that makes a current limiting semiconductor switching element perform a switching operation when a terminal voltage of a charging capacitor reaches the predetermined value.

REFERENCES:
patent: 5202813 (1993-04-01), Uota et al.
patent: 5416665 (1995-05-01), Nishiwaki et al.
patent: 6169431 (2001-01-01), Xu
patent: 61-93529 (1986-05-01), None
patent: 3-55232 (1991-12-01), None
patent: 5-291031 (1993-11-01), None
patent: 6-38359 (1994-02-01), None
patent: 7-220598 (1995-08-01), None
patent: 8-17315 (1996-01-01), None

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