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Unformatted text preview: through opto-couplers.
5.Large duty cycle range of pulse width is
6.High overall efficiency of gate drive is possible.
7.Overload and short circuit protection can be
easily implemented using either DESAT
concept or current sense method. This is
explained in section 4.2.2, using Fig. (12) and
7. MATRIX CONVERTERS
Matrix converters afford great ease and
convenience in AC-AC conversion, without the
need for bulky energy storage components
required in AC-DC-AC conversion. In addition,
they allow regenerative energy to be fed back to
Mains and feature sinusoidal input and output
A basic 3 phase to 3 phase matrix converter
uses nine bi-directional switches as shown in Fig
(17). Several different configurations of
achieving bi-directional switches using IGBTs
and FREDs are shown in Fig.(15) and Fig.(16).
Each IGBT used in these bi-directional switches
will require isolated gate drive and it is here that
the real value and convenience of a gate drive
transformer can be appreciated. It is difficult to
imagine, use of opto-couplers, chiefly because
of the need for isolated power supply.
Tiny gate drive transformers come really handy
in this application, with all its attendant
advantages as listed above.
With proliferating applications of modern power
electronics worldwide, faster, more efficient and
more compact MOSFETs and IGBTs are
replacing older solid state and mechanical
devices. The design of newer and more efficient
techniques to turn these solid state devices on
and off is a subject that requires thorough study
and understanding of the internal structure and dynamic processes involved in the working of
Main emphasis in modern Power Electronics is to
reduce total losses dissipated in devices and
subsystems for higher operating efficiency and
achieving more compact designs, reducing volume
and weight of resultant systems. Thus, operation at
higher and higher switching frequencies is now a
necessity, and as a result, switc...
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This note was uploaded on 01/15/2014 for the course ECE 624 taught by Professor Staff during the Winter '08 term at Ohio State.
- Winter '08