Fractional frequency converter using zero switching of input frequency halfwaves
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United States of America Patent
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-
Dec 15, 1987
Grant Date -
N/A
app pub date -
Oct 28, 1986
filing date -
Oct 28, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A frequency converter is provided for a three-phase electric motor and has input connections for a multi-phase alternating current electric supply source, and output connections for connection to a three-phase electric motor. A SCR bridge including a plurality of SCRs interconnects the input connections and the output connections. A trigger circuit is connected to the SCR bridge for selective firing of the SCRs, in response to timing pulses generated upon zero crossing of the input means phases. Logic circuits interconnecting said timing pulse generators and the trigger circuits for effecting selective sequential firing of the SCRs at the zero crossings. Firing of said SCRs is respectively terminated by natural commutation. In one embodiment of the invention single phase current is converted to multiphase current.
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