The rectification of alternating currents is the most efficient means of obtaining
HVDC supplies. Although all circuits in use have been known for a long time,
the cheap production and availability of manifold solid state rectifiers has
facilitated the production and application of these circuits fundamentally. Since
some decades, there is no longer a need to employ valves, hot cathode gasfilled
valves, mercury pool or corona rectifiers, or even mechanical rectifiers
within the circuits, for which the auxiliary systems for cathode heating, etc.,
have always aggravated their application. The state of the art of such earlier
circuits may be found in the work of Craggs and Meek,4 which was written
in 1954. All rectifier diodes used now adopt the Si type, and although the
peak reverse voltage is limited to less than about 2500 V, rectifying diode
units up to tens and hundreds of kVs can be made by series connections if
appropriate means are applied to provide equal voltage distribution during the
non-conducting period. One may treat and simulate, therefore, a rectifier within
the circuits – independently of the voltage levels – simply by the common
symbol for a diode.
The rectification of alternating currents is the most efficient means of obtainingHVDC supplies. Although all circuits in use have been known for a long time,the cheap production and availability of manifold solid state rectifiers hasfacilitated the production and application of these circuits fundamentally. Sincesome decades, there is no longer a need to employ valves, hot cathode gasfilledvalves, mercury pool or corona rectifiers, or even mechanical rectifierswithin the circuits, for which the auxiliary systems for cathode heating, etc.,have always aggravated their application. The state of the art of such earliercircuits may be found in the work of Craggs and Meek,4 which was writtenin 1954. All rectifier diodes used now adopt the Si type, and although thepeak reverse voltage is limited to less than about 2500 V, rectifying diodeunits up to tens and hundreds of kVs can be made by series connections ifappropriate means are applied to provide equal voltage distribution during thenon-conducting period. One may treat and simulate, therefore, a rectifier withinthe circuits – independently of the voltage levels – simply by the commonsymbol for a diode.
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