Patent ID: 9246411
Filing Date: 2016-01-26
CPC Classification: H02J,H02M,Y02E

Claim Text:
1. A regenerative rectifier apparatus, comprising: a voltage doubler circuit, including first and second AC input nodes, a plurality of passive rectifier devices connected in series with one another between first and second DC nodes, and a pair of capacitances connected in series with one another between the first and second DC nodes, the voltage doubler circuit comprising: a first rectifier diode including an anode terminal coupled to the first AC input node and a cathode terminal connected to the first DC node, a second rectifier diode including an anode terminal coupled to the second DC node and a cathode terminal coupled to the first AC input node, a first capacitance coupled between the first DC node and the second AC input node, and a second capacitance coupled between the second AC input node and the second DC node; a plurality of switching devices individually coupled in parallel across a corresponding one of the plurality of passive rectifier devices, the plurality of switching devices comprising a first switching device coupled in parallel with the first rectifier diode, the first switching device operative according to a first switching control signal in a first state to conduct current from the first DC node to the first AC input node and in a second state to prevent conduction of current from the first DC node to the first AC input node, and a second switching device coupled in parallel with the second rectifier diode, the second switching device operative according to a second switching control signal in a first state to conduct current from the second DC node to the first AC input node and in a second state to prevent conduction of current from the second DC node to the first AC input node; and a controller operative in a first mode to provide the first and second switching control signals to maintain the first and second switching devices in the respective second states, and in a second mode to provide the first and second switching control signals at a switching frequency generally equal to a fundamental frequency of AC input power received at the first and second AC input nodes to selectively allow conduction of regenerative current from at least one of the DC nodes to at least one of the first and second AC input nodes; the controller being operative in the second mode to provide a periodic pulsed first switching control signal at the switching frequency in the first state for a first pulse width time overlapping a positive peak in an AC voltage at the first AC input node to periodically allow the first switching device to conduct current from the first DC node to the first AC input node; and wherein the controller is operative in the second mode to provide a periodic pulsed second switching control signal at the switching frequency in the first state for a second pulse width time overlapping a negative peak in the AC voltage at the first AC input node to periodically allow the second switching device to conduct current from the second DC node to the first AC input node.