Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1986-06-02
1987-11-17
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 85, 307 87, 361 92, 363 98, H02J 900
Patent
active
047076186
ABSTRACT:
A continuous power source operating as an uninterruptible power supply functions as an on-line power management device for output loads such as computers. During normal power flow operation, alternating current power passes from a conventional AC line power input through a power line filter and a power monitor and phase shift circuit to output terminals coupled to the load. The power monitor circuitry provides control signals for synchronizing the frequency and phase of a sine wave generator, the output of which is coupled to a normally inoperative static inverter as the control signal for controlling the frequency and phase of operation of such static inverter. The output of the static inverter is coupled to the load terminals through a transformer. If the voltage of the line alternating current signal falls outside a predetermined window, the power monitor switches off power from the line to the load terminals and enables the static inverter for operation. The switch-over is nearly instantaneous and occurs within the time delay of the phase shift circuit; so that essentially no detectable difference is discernable at the output load terminals during and after a switchover from the primary power source to the altenate power source and vice-versa.
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Ip Shik Luen Paul
Shoop Jr. William M.
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