Patent ID: 8803361

Claim:
An uninterruptible power supply, comprising: an input configured to receive input power; an output; a power conversion circuit coupled with the input and the output; a bypass switch configured to couple the input to the output in a bypass mode of operation; a controller coupled with the power conversion circuit, and the bypass switch; the controller configured to activate the bypass switch in a first configuration to provide the input power at the output during a first half of a cycle of an input voltage waveform; and the controller configured to activate the bypass switch in a second configuration different from the first configuration to provide the input power at the output during a second half of the cycle of the input voltage waveform wherein the controller comprises a phase lock loop circuit and a gate control circuit, the phase lock loop circuit configured to provide the input voltage waveform to the gate control circuit, and the gate control circuit configured to activate the bypass switch in one of the first configuration and the second configuration based at least in part on the input voltage waveform.