Patent Number: 6,166,933

Title: Snubber circuit for an inverter having inductively coupled resistance

Abstract: A snubber circuit is disclosed having a pair of series connected switches, each switch having a capacitor in parallel with the switch. The snubber circuit includes a coupling element, such as a coil winding, or air-core transformer, in close proximity to a branch circuit having the capacitor therein. The coupling element is connected to a resistor and inductively couples the resistor in series with the capacitor in the branch circuit. The resistor is preferably located remotely from the capacitor. Therefore, a relatively high value, high power-rated resistor can be inductively coupled by the coupling element into the branch circuit in series with the capacitor without introducing additional inductance into the branch circuit. The invention is particularly useful in physically constricted snubber circuit arrangements and permits the use of readily available discrete resistors with the desired power rating to obtain the desired equivalent induced resistance. The snubber circuit effectively reduces oscillations that are caused by the switching of the switches in the snubber circuit.

Inventors: Bowers; Thomas J. (New Berlin, WI)

Assignee: Pillar Industries, Inc.

International Classification: H02M 7/00 (20060101); H02M 7/538 (20060101); H02H 007/122 ()

Expiration Date: 12/26/2013