US 5,313,358 AGranted

Multiphase common mode transient suppressor

AssigneePremier Power, Inc.

InventorAlex J. Severinsky

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Abstract

A multiphase common mode transient suppressor is disclosed which uses a plug choke placed at the utility power service input to the circuit of the present invention. The plug choke contains, for example, three coils corresponding to three power carrying input conductors. Each coil is wound in the same direction, and has the same number of turns. Preferably, a magnetic core is provided around which the coils are wound. At the output of the plug choke are placed three capacitors, in parallel between a grounding conductor and three output conductors. The choke in combination with the capacitors creates a resonant circuit. A control circuit is provided which is connected to the plug choke via a catcher coil. The catcher coil "catches" the flux induced by the transient and dissipates its energy through a resistor, thus dampening the resonant circuit. Current through the resistor is controlled by a semiconductor switch. The semiconductor switch in turn is controlled by a control circuit comprising, preferably, a voltage conditioner, a comparator, an edge detector and a pulse generator. Additionally, a diode bridge is placed between the catcher coil and the resistor to ensure that current through the resistor and the semiconductor switch is always in the same direction.

Claims11

Dependent claims

A multiphase common mode transient suppressor comprising:

a plurality of input terminals for receiving incoming electrical power, said input terminals corresponding to a plurality of input power conductors;
a plurality of corresponding power output terminals for providing outgoing electrical power, said output terminals corresponding to a plurality of output conductors;
an input ground terminal for connection to an input ground conductor and an output ground terminal for connection to an output ground conductor, said input and output ground terminals being connected together;
current storage means coupled between said input terminals and said output terminals for storing current from said incoming power, said current storage means being formed of a core and a plurality of electrical coils wound around said core, each of said coils having a beginning end and an ending end, each of said input terminals and their respective said corresponding output terminals being connected to said beginning and said ending end respectively of a respective said coil;
electrical charge storage means for storing an electrical charge, said charge storage means being coupled between respective ones of said plurality of output terminals and said output ground terminal;
catcher coil means formed of an electrical coil wound around said core for dampening oscillations produced by said current storage means and said charge storage means;
and
control means coupled to said catcher coil means for controlling the operating of said catcher coil.

5 more elements

Dependencies are inferred from the claim text.