Download Hardware and software development for EM

Secondary Control Types:
Simple Switching Regulator
Switched Shunt 2 Quadrant Regulator
Four Quadrant Regulator
Four Quadrant Bridge Regulator
Combinations of the above
A four quadrant regulator is one in which the voltage or
current can be arbitrarily of the same or opposite polarity.
This feature is required to prevent the self-destruction of a.
transmitter that could be driving a very inductive load at
high power levels.
Such a regulator can remove power stored
in the load, as well as driving the load.
A final converter-circuit was designed which makes use of
both phase shift control and pulse width modulation and can
operate in four quadrants.
The switching frequency of the
main regulator considered will be 110 kHz to achieve the
required bandwidth and most semi-conductors only need to have
ratings of 300v.
To produce the required extreme degree of regulation at
lower frequencies, an adaptive digital loop regulator must be
combined with the analogue controlled switch mode regulator.
Special design considerations were given to voltage isolation,
precise output current sensing, and cooling the circuitry in a
sealed enclosure.