LHC / ACTIVE FILTER
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The active filter is used to reduce the output voltage ripple of the LHC thyristor-power converters and to increase its voltage bandwidth.
An injection transformer is placed in series with the output capacitor bank.
The active filter has the characteristics of a voltage generator that injected through an isolation transformer a voltage Uc which is the opposite of the output voltage , in order to reduce the output ripple. It must be capable of withstanding the current caused by bridge rectifier or unusual transitional regimes.
Without active filter:
With active filter:
LHC AF power converter architecture
Power Part simplified Architecture / Topology .pdf
Regulation Control simplified schematic
Number of LHC Active Filters installed in LHC: