Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1984-09-06
1986-12-02
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 97, H02H 300
Patent
active
046269541
ABSTRACT:
A power controller with overload protection having an alternating current source (AC) connected through power lines (L1, L2) and a pair of power switching devices (FET1, FET2) and a current sensor resistance shunt (SH) in series to a load (LD). A line-derived control power supply circuit (LDS) is connected through one of the power switching devices (FET1) to the lower line (L1, L2) such that the control power supply current does not flow through the shunt (SH) or the load (LD). Close and open commands are applied from a control switch (CSW) through a threshold detector (DT) and a logic circuit (LG1) to operate a latch (LCH) that turns the power switching devices (FET1, FET2) on and off under the clocking control of a zero voltage detector (ZVD) and a zero current detector (ZCD) and the gating control of a minimum current circuit (MCC). An overload circuit (AVC, ITC, TTC) provides instantaneous trip of the latch on rupture current or timed trip of the latch on smaller overloads. Opto-isolated indicators (SS, ST) indicate trip conditions and loss of line voltage conditions as well as whether the load current is above or below a minimum current value which is a current level adequate for operation of the control system.
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Hexfet Databook, International Rectifier, 1982-83, pp. A-47, A-49, A-50, A-126 and A-129.
Damiano Michael A.
Gass Dale L.
Kramer Dennis M.
Schmerda Richard F.
Autio W. A.
Eaton Corporation
Grace C. H.
Hoff Marc S.
Salce Patrick R.
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