Power supply circuit of an excitation coil of an electromagnet

Details Power supply circuit of an excitation coil of an electromagnet Power supply circuit of an excitation coil of an electromagnet

1996-10-10

1998-09-08

Wong, Peter S.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361197, 361154, H01H 4704

Patent

active

058054057

ABSTRACT:
A power supply circuit, using direct current or rectified alternating current sources having output and return supply lines (a, b), for a coil of an electromagnet having at least one principal winding (B1) and a secondary winding (B2). The power supply circuit includes a first semiconductor element (T2) having a gate and a source drain path and capable of providing or blocking a supply of current to the secondary winding (B2), the source drain path connected between the secondary winding (B2) and the return supply line (b); and a switching means (10) connected between the primary winding (B1) and the gate of the first semiconductor element (T2). The switching means (10) includes a second semiconductor element (T1) having a gate and a source drain path and capable of keeping the first semiconductor element (T2) from conducting when a voltage between the gate of the second semiconductor element (T1) and the return supply line (b) reaches a threshold voltage (Vs) greater than a value (V1) corresponding to a start of a closing of the electromagnet, the source drain path of the second semiconductor element (T1) connected between the gate of the first semiconductor element (T2) and the return supply line (b), and an adaptation circuit connected between the primary winding (B1) and the gate of the second semiconductor element (T1).

REFERENCES:
patent: 3689808 (1972-09-01), Stampfli
patent: 3737736 (1973-06-01), Stampfli
patent: 3786314 (1974-01-01), Misch
patent: 4032823 (1977-06-01), Arvisenet et al.
patent: 4114184 (1978-09-01), Stampfli
patent: 4227231 (1980-10-01), Hansen et al.
patent: 4873607 (1989-10-01), Yamamoto
patent: 4998177 (1991-03-01), Takizawa et al.
Patent Abstracts of Japan, vol. 7, No. 106 (M-213), May 10, 1983, JP 58-28074, February 18, 1983.

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