Patent ID: 9601944
Date: 2017-03-21
CPC Classifications: H02J,H02M

Claim:
1. An uninterruptable power supply, comprising: an input to receive an input AC voltage; an input circuit coupled to the input and including a positive boost circuit and a negative boost circuit, and configured to provide a positive DC voltage at a first output and a negative DC voltage at a second output; a controller coupled to the input circuit and configured to provide a first current reference signal, the first current reference signal having a periodic waveform including a first half period and a second half period, each half period having a period end, the waveform comprising a substantially rectified sine wave modified such that a value of the rectified sine wave is equal to zero for a predetermined period of time prior to the period end of the second half period; a positive current loop control circuit coupled to the controller and to the positive boost circuit and configured to receive the first current reference signal and provide an output signal to the positive boost circuit; and a negative current loop control circuit coupled to the controller and to the negative boost circuit and configured to provide an output signal to the negative boost circuit.