公开(公告)号：CA1111517A

公开(公告)日：1981-10-27

申请号：CA282254

申请日：1977-07-07

Applicant: IBM

Inventor： FERRY MICHEL F ,  REYNES DANIEL F

IPC: H03K17/60

Abstract: An inductive load driving amplifier is disclosed which includes two serially connected transistors, with Zener diodes limiting the collector-emitter voltage of the one and diverting the collector-base current of the other when the first one switches off. The driver is implemented as an integrated circuit. This collector isolation constitutes a high voltage Zener diode which contributes to limit the collector voltages. The combination of these features prevents the device from being exposed to second breakdown when switching highly inductive loads (e.g. several Henrys under SOV), thereby avoiding the harmful effects of breakdowns during switching.

公开(公告)号：FR2310657A1

公开(公告)日：1976-12-03

申请号：FR7515087

申请日：1975-05-06

Applicant: IBM FRANCE

Inventor： FERRY MICHEL F

IPC: H03H11/02 ,  H03H11/04 ,  H03H11/00

Abstract: An active transformer is disclosed of the type which includes two primary terminals to which is applied a voltage v1 with a current i1, and two secondary terminals supplying a voltage v2 with a current i2. The transformer is characterized in that it includes a first circuit whose input, connected to the primary terminals, generates an input current of the form i1' = jC1 omega v1 and whose output supplies a current of the form i2'' = -jN omega v1 to the secondary. The transformer also includes a second circuit whose input, connected to the secondary terminals, generates an input current of the form i2' = jC2 omega v2, and whose output supplies a current i1'' = -jN omega v2 to the primary. The terms C1, C2 and N are respectively the dual equivalents of the terms L1, L2 and M found in the relations associated with a conventional transformer. The currents flow in such a way that they satisfy the relations i1 = i1' - i1' and i2 = i2' - i2''.