文档介绍：Parallel Operation Of Semiconductor Switches
Application Note June 1993 AN-7513
In uninterruptable power supplies demands for current han- (Figure 1). The dynamic area is only a fraction of the total
/Title dling capability to meet load current In uninterruptable power waveform, but it is by far the most important when es
supplies demands for current handling capability to meet to parallel operation.
AN75 load current requirements plus margins for overload and reli-
In power electronics, there are three different load types;
3) ability purposes often exceed the capability of the largest
resistive, capacitive, and inductive. The resulting waveforms
semiconductor device type considered and paralleling may
Sub- are sufficiently different to require either different switching
e an attractive alternative. All switching power semi-
ect devices or the circuit designer may have to change the
conductors starting with SCR’s [1], bipolar transistors [2-4]
switching circuit to meet the different requirements, espe-
Paral- darlingtons [5] and field effect transistors [6-10], have been
cially when devices are operated in parallel.
el essfully paralleled, but proper precaution had to be
pera- taken. We will review some of these methods, describe the Off-State
ion Of characteristics of the insulated gate transistors, and show
the proper methods to operate this