A new Amorphous saturable core for a magnetic amplifier at high frequency

In view of the increased use of higher frequencies for switching power supply, a new amorphous saturable core for a high frequency magnetic amplifier has been developed. Its core loss is about one half of that for a conventional amorphous saturable core, and one third of that for an 80 Ni permalloy core with a high rectangular ratio. The newly developed amorphous saturable core has been actually operated as a magnetic amplifier in a 220 kHz dc-to-dc converter. It is found that the converter efficiency increases by about 1%, core temperature rise decreases by 12??C, and the reset current reduces to about one half, in comparison with a conventional amorphous saturable core. These improvements are more conspicuous, when compared with an 80 Ni permalloy core.