Active power line conditioner with low cost surge protection and

Details Active power line conditioner with low cost surge protection and Active power line conditioner with low cost surge protection and

1992-10-30

1994-02-15

Black, Thomas G.

Boots, shoes, and leggings

363 50, 363 52, 363 54, 361 35, H02M 754, H02M 7505, H02M 7521

Patent

active

052872882

ABSTRACT:
These and other objects are achieved by an improved active power line conditioner in accordance with the invention. The active power line conditioner includes series inverter coupled to an energy input source, and a parallel inverter coupled to a non-linear load. The non-linear load is powered by a load current which includes fundamental components and harmonic components. An energy storage element is electrically connected between the series inverter and the parallel inverter. A fault condition shorting circuit is supplied in accordance with the invention. The fault condition shorting circuit is coupled to a secondary transformer winding within the series inverter. The fault condition shorting circuit includes a diode bridge which conveys diode bridge current only in the presence of an overvoltage or overcurrent condition. A threshold device is connected to the diode bridge and conducts threshold device current in response to the diode bridge current. The circuit also includes a thyristor with its gate coupled to the threshold device. The thyristor is fired by the first threshold device current so as to short the secondary transformer winding in the presence of an overvoltage or overcurrent condition.

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