Abstract

The switching cell (1), comprises, between the terminals of a supply source (2) supplying a voltage (VC), a controlled power switch (T) and a current recirculation device (CRD) including a diode or a junction, between which there is defined a common terminal (O) of the cell (1). Across the current recirculation device (CRD) there are connected controlled electric charge supply means (TL, VL, DL; TH, VH, DH) comprising a first generator circuit (TL, VL, DL) for generating a low voltage, including a first d.c. voltage source (VL), an associated first controlled switch (TL), and a first diode (DL), and adapted to supply an electric charge sufficient to cause the reverse-recovery of the current recirculation device (CRD); and a second generator circuit (TH, VH, DH) for generating a higher voltage, including a second d.c. voltage source (VH), an associated second controlled switch (TH) and a second diode (DH) having a lower capacitance than that of the first diode (DL), and adapted to inject into the recirculation device (CRD) an amount of electric charge (QD) which varies in a non-linear manner as a function of the voltage, and also to deliver an amount of electric charge sufficient to cause the first diode (DL) to be cut off when the first controlled switch (TL) is closed.

IPC Classes  ?

• H03K 17/0414 - Anti-saturation measures
• H03K 17/0416 - Modifications for accelerating switching without feedback from the output circuit to the control circuit by measures taken in the output circuit
• H03K 17/74 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of diodes
• H02M 1/34 - Snubber circuits
• H03K 17/00 - Electronic switching or gating, i.e. not by contact-making and -breaking

Abstract

The method can be used for the regulation of power in an alternating current electrical network (ACNW; ACNW1,ACNW2), using a conversion system (PCS) having at least two terminals (1,2; 1,2,3; 1,2,3,N) for connection to the network, wherein each of said terminals has a corresponding electrical potential. Each of the potentials of these terminals has an upper and a lower envelope, the difference between which, or envelope voltage (VEP,EN), is a variable positive continuous quantity having a maximum value (VEA) called the envelope amplitude. The method comprises the operations of: defining at least an upper range (ER) of voltage values, comprising said maximum value or envelope amplitude (VEA) and having a width (VE; VEE) which is substantially smaller than the envelope amplitude (VEA); using a structure (PCS) including at least a first static converter (ES) capable of regulating the electrical power by the regulation of the envelope voltage (VE; VEE) in the aforesaid upper range (ER); this upper range (ER) having a width determined in such a way that the at least one static converter (ES) regulates more than one half of the mean active electrical power exchanged with the network (ACNW; ACNW1, ACNW2).

IPC Classes  ?

• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration