Output stage of a charging device, including a transformer, rectifier, converter, capacitor, storage device and a use thereof
An output stage of a charging device includes a first secondary winding of a transformer, a first rectifier which is connected to the first secondary winding, a step-down controller which is connected to the output of the first rectifier, and a first output capacitor. In order to be able to reduce the switching losses in the switch of the step-down controller and to reduce the magnitudes of the inductance, the transformer includes a second secondary winding to which a second rectifier) together with a second output capacitor are connected, wherein the first and second output capacitors are connected in series.
1. An output stage of a charging device, comprising:
a first secondary winding of a transformer,
a first rectifier connected to the first secondary winding,
a step-down converter connected to the output of the first rectifier and having a first output capacitor, said output stage providing an unregulated basic voltage by a second secondary winding of the transformer, to which a second rectifier and a second output capacitor is connected,
a second secondary winding of the transformer, and
a second rectifier and a second output capacitor connected to the second secondary winding,
wherein the first and the second output capacitor are connected in series.
2. The output stage as claimed in claim 1 , comprising a plurality of cascaded step-down converters.
3. The output stage of claim 1 , wherein the first and second secondary winding are configured so that the second secondary winding supplies a smaller voltage than the first secondary winding.
4. The output stage of claim 1 , wherein the second secondary winding is configured so as to supply a basic voltage that corresponds to a smallest permissible voltage of a storage device to be charged and the first secondary winding supplies an additional voltage which increases the basic voltage to a desired voltage for the storage device to be charged.
5. An output stage of a charging device comprising
a first secondary winding of a transformer,
a first rectifier connected to the first secondary winding,
a step-down converter connected to the output of the first rectifier and having a first output capacitor, said output stage providing an unregulated basic voltage by a second secondary winding of the transformer, to which a second rectifier and a second output capacitor is connected,
a second secondary winding of the transformer,
a second rectifier and a second output capacitor connected to the second secondary winding,
wherein the first and the second output capacitor are connected in series and supply a sum voltage, and
a storage device connected to the series-connected first and the second output capacitors and receiving the sum voltage.