| 摘要 |
An electrical converter ( 1 ) comprising a converter input (IN 1 , IN 2 ) for receiving electrical power; a converter output (OUT 1 , OUT 2 ) for releasing electrical power; an electrical energy storage device ( 2 ) having a storage input connected to a converter input (IN 1 , IN 2 ) and having a storage output connected to a converter output (OUT 1 , OUT 2 ). During a primary stroke period (t<SUB>prim</SUB>) electrical energy is stored from the received electrical power, and during a secondary stroke period (t<SUB>sec</SUB>) electrical energy is released to the converter output (OUT 1 , OUT 2 ). The electrical converter ( 1 ) has a control device ( 4 ) comprising: a current sensing device ( 5 ) for sensing the amount of current flowing to the electrical energy storage device ( 2 ); a first time control device ( 44 ) communicatively connected to the current sensing device for controlling the duration of at least one of said stroke periods such that the current flowing to the electrical energy storage device ( 2 ) during the primary and secondary stroke is substantially equal to or lower than a predetermined maximum current; and a second time control device ( 41 - 43 ) for controlling the duration of an off-time period (t<SUB>off</SUB>) in which the electrical energy storage device ( 2 ) releases substantially no electrical energy, such that a time average of the current flowing to the electrical energy storage device ( 2 ) is equal to a predetermined value, which time average is the average over a switching period comprising the primary stroke period (t<SUB>prime</SUB>), the secondary stroke period (t<SUB>sec</SUB>), and the off-time period (t<SUB>off</SUB>).
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