Patent ID: 9621051
Date: 2017-04-11
CPC Classifications: H02M,Y02B

Claim:
1. An electrical power converter, comprising: an inverter with semiconductor switches; a resonant circuit coupled with the inverter; and a controller for switching the semiconductor switches of the inverter to switching states, wherein the controller is adapted for periodically switching the inverter between switching states, such that a periodic resonant current is generated in the resonant circuit, the switching states comprising a free-wheeling state for short-circuiting the resonant circuit and at least one of: wherein the controller is adapted for determining a zero crossing of the resonant current as a specific periodic point, and wherein the controller is adapted for switching the inverter to the power forward state and to the power backward state at a predefined first time period before the zero crossing, wherein the controller is adapted for switching the inverter to the free-wheeling switching state at a predefined second time period after the zero crossing and the predefined second time period is a different time period than the predefined first time period, wherein the controller is adapted for synchronizing switching events of the switching states with the periodic resonant current, such that a switching state is applied to the inverter at a time point associated with the specific periodic point of the periodic resonant current, and wherein the controller is adapted during a low-power mode for applying a plurality of the switching states such that an overall power feed backward from the resonant circuit to an input of the inverter is balanced with an overall power feed forward from the input of the inverter to the resonant circuit.