Control of the mains bridge of a frequency converter
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United States of America Patent
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Jul 24, 2007
Grant Date -
Dec 22, 2005
app pub date -
Jun 16, 2005
filing date -
Jun 17, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and a system for controlling the mains bridge of a four-quadrant PWM frequency converter provided with a direct-voltage intermediate circuit when power is flowing into the supply network. The mains bridge includes a controlled mains bridge (INU) for rectification of the mains voltage to produce a DC intermediate-circuit direct voltage (U.sub.DC) consisting of arms conducting during the positive and negative half cycles of the phase voltage of each phase of the supply network, each arm having a switch unit formed by a diode (D1 D6) and a power semiconductor switch (V1 V6), e.g. an IGBT, connected in inverse-parallel with it.
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