Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1995-12-29
1997-11-18
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
361 79, H02H 710
Patent
active
056894082
ABSTRACT:
This invention provides a small-sized magnetic amplifier with a simple construction. The magnetic amplifier comprises a voltage converting portion composed of a switching element, a transformer and a magnetic amplifier for inducing a pulse signal having a predetermined period and voltage level and converting this pulse signal to a voltage signal, a rectifying and smoothing portion for rectifying and smoothing an output voltage of the voltage converting portion and supplying it for a load, a reset current supplying portion for detecting an output voltage of the rectifying and smoothing portion and comparing it with a predetermined reference voltage, and, when an overvoltage is detected, supplying a reset current to adjust the overvoltage for the output of the voltage converting portion, a reset current limitation portion connected between the voltage converting portion and the rectifying and smoothing portion for forming a discharge loop in which, when a voltage to be outputted from the voltage converting portion has positive value, a flowing current is charged, and when the voltage to be outputted from the voltage converting portion has negative value, the flowing current is discharged, while a discharge path is in direction opposite to a direction of the reset current.
REFERENCES:
patent: 4363064 (1982-12-01), Billings et al.
patent: 4437133 (1984-03-01), Rueckert
patent: 4616302 (1986-10-01), Mandelcorn
patent: 4918592 (1990-04-01), Shimizu
Nguyen Matthew V.
Samsung Electro-Mechanics Co. Ltd.
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