| 摘要 |
An electronic half-bridge ZETA converter may include a transformer, wherein a half-bridge is connected to the primary winding of transformer, and wherein a respective capacitance and a respective diode are associated with the half-bridge switches. Moreover, the converter includes a ZETA converter which is connected to secondary winding of transformer, so that the ZETA converter includes a first inductance, which includes the magnetization inductance of transformer, and a second inductance. Finally, the converter includes a control unit which drives the half-bridge switches with four time intervals that are repeated periodically. Specifically, during the fourth time interval the first and the second switch are opened, so that the capacitance associated with said second switch is charged and the capacitance associated with said first switch is discharged, enabling a zero voltage switching. |
| 主权项 |
1. An electronic half-bridge ZETA converter for providing a power signal through an output, said electronic half-bridge ZETA converter comprising:
a transformer with a primary winding and a secondary winding, wherein each winding comprises at least a first and a second terminal, a half-bridge comprising a first and a second electronic switch for selectively connecting said first terminal of said primary winding to a supply signal or a ground, wherein a respective capacitance and a respective diode are associated with said first and said second electronic switch, at least one capacitor connected between said second terminal of said primary winding and said supply signal and/or said ground, an electronic ZETA converter connected to said secondary winding, wherein said ZETA converter comprises three branches which are connected in parallel, wherein: a) the first branch comprises a first capacitor connected in series with the secondary winding of said transformer, so that said first branch comprises a first inductance with includes the magnetization inductance of said transformer and possible other inductors connected in parallel with the primary and/or secondary winding of said transformer, b) the second branch comprises a diode, and c) the third branch comprises a second capacitor connected in series with a second, wherein said output is connected in parallel with said second capacitor; and a control unit configured for driving said first and said second electronic switch with the following time intervals which are repeated periodically: a) a first time interval, wherein said first switch is closed and said second switch is opened, so that a current flow from said supply signal through said primary winding of said transformer increases; b) a subsequent second time interval, wherein said first switch is opened and said second switch is opened; c) a subsequent third time interval, wherein said first switch is opened and said second switch is closed; and d) a subsequent fourth time interval, wherein said first switch is opened and said second switch is opened, so that the capacitance associated with said second switch is charged and the capacitance associated with said first switch is discharged, wherein said first and said second inductance are dimensioned such that said first and said second inductance provide during said forth time interval a current which charges the capacitance associated with said second switch and discharges the capacitance associated with said first switch. |
