(19)
(11) EP 0 302 856 A1

(12)

(43) Date of publication:
15.02.1989 Bulletin 1989/07

(21) Application number: 87901457.0

(22) Date of filing: 24.02.1987
(51) International Patent Classification (IPC): 
G05F 3/ 06( . )
H01F 30/ 10( . )
(86) International application number:
PCT/EP1987/000101
(87) International publication number:
WO 1987/005412 (11.09.1987 Gazette 1987/20)
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 28.02.1986 IT 19860019600

(71) Applicant: ELEKTRENE S.R.L.
I-20141 Milan (IT)

(72) Inventor:
  • PETROGALLI, Lorenzo
    I-20131 Milan (IT)

(74) Representative: Dr. Ing. A. Racheli & C. S.r.l. 
Viale San Michele del Carso, 4
I-20144 Milano
I-20144 Milano (IT)

   


(54) IMPROVEMENTS IN FERRORESONANT CONSTANT-VOLTAGE TRANSFORMERS