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NO BREAK POWER SYSTEM

  • US 3,665,495 A
  • Filed: 06/01/1970
  • Issued: 05/23/1972
  • Est. Priority Date: 06/01/1970
  • Status: Expired due to Term
First Claim
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1. A no-break power supply system for providing power continuously to a critical load and for providing total electrical isolation of the load from the normal power source, comprising:

  • a synchronous motor-synchronous generator set mechanically coupled for concurrent rotation, said synchronous motor having a leading power factor;

    a source of first alternating current;

    rectifier means connected to said source of first alternating current for converting said first alternating current to direct current;

    an inverter network having an input and an output and comprising a plurality of controlled rectifiers, each having a control electrode, the input of said inverter network being coupled to said rectifier means to receive said direct current;

    pulse generating means for applying pulses to said control electrodes to selectively turn on said controlled rectifiers and provide a second alternating current at the output of said inverter network;

    means connecting the output of said inverter network to said synchronous motor for supplying said second alternating current to said motor and for driving said motor continuously at a speed determined by the frequency of said second alternating current, the leading power factor of said synchronous motor serving to commutate said inverter network, said motor in turn driving said synchronous generator to produce a third alternating current;

    a standby source of direct current connected to and normally floating across the input to said inverter network for supplying power to said system during a fault condition;

    means responsive to said first and third alternating currents for controlling the frequency of said pulse generating means to bring said first and third alternating currents into phase synchronization;

    means responsive to a fault condition for disabling said means for controlling the frequency of said pulse generating means, whereby said pulse generating means becomes free running; and

    load means connected to said synchronous generator for continuously receiving only that current which is supplied by said synchronous generator whereby said load means is electrically isolated from said source of first alternating current.

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