Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1983-02-14
1984-09-04
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318803, 318806, H02P 540
Patent
active
044699999
ABSTRACT:
A regenerative drive control is connectable to an AC power source and includes a negative converter bridge (10) having an input (12, 14, 16) connectable to the AC power source and an output connectable to a DC bus, including a positive bus (18) and a negative bus (20), a load (24) having inductance and resistance and operable to generate regenerative current and direct regenerative current through the negative converter bridge to the AC power source. The negative converter bridge includes a plurality of SCR's (41, 42, 43, 44, 45, 46) arranged in a plurality of series connected pairs with each series connected pair forming a leg of the converter bridge which extends between the positive and negative buses. A gating circuit (80) is provided for sequentially gating the SCR's to establish a controllable DC output on the DC bus. Sensing means (110) for generating an inhibit signal indicative of a fault is provided. The sensing means acts to de-energize the load to prevent generation of regenerative current upon the occurrence of a fault. The sensing means also acts to prevent the gating circuit from normally sequentially gating the plurality of switchable devices to deenergize the DC output on the DC bus which is directed to the load upon the occurrence of a fault. The sensing means, upon the occurrence of a fault, actuates the gating circuit to causes the gating circuit to gate at least one of the switchable devices from a nonconductive state to a conductive state to effect the simultaneous conduction of a pair of switchable devices forming a leg of the negative converter bridge to provide a circulating path through the negative converter bridge for the inductive current of the load to enable the inductive current to exponentially decay toward zero.
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Eaton Corporation
Grace C. H.
Smith Jr. David
Union M. L.
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