Patent ID: 9068901
Filing Date: 2015-06-30
Classification: G01M,H02M,H02P

Abstract:
1. An apparatus for vibration testing, comprising: a plurality of current sources configured to output a substantially constant direct current, each current source of the plurality of current sources comprising a half-bridge switch configured to operate based on a pulse-width modulated signal and an inductor electrically connected to an output of the half-bridge switch, each current source of the plurality of current sources configured to individually supply a periodic alternating current waveform that is out of phase relative to the periodic alternating current waveforms of the other current sources of the plurality of current sources, a sum of the periodic alternating current waveforms from the plurality of current sources providing the substantially constant direct current; and an electro-dynamic shaker configured to electrically connect to the plurality of current sources and receive the substantially constant direct current to power operation of the electro-dynamic shaker, wherein the plurality of current sources comprise more than two current sources and an even number of total current sources.