Transformer of an electrical system for dc voltage conversion and for charging of batteries of a vehicle

The transformer (20) according to the preceding claim, wherein:

• the Litz wires of the primary windings (P1, P2, P3) and the first secondary windings (S1, S2, S3) are made of series connections between multiples turns;
• and/or
• the tertiary windings of the transformer (20) are respectively arranged by comprising parallel-connected turns.

The transformer (20) according to any one of the preceding claims, wherein for each of the limbs of the magnetic core (5), the corresponding first secondary winding is sandwiched between two sets of turns of the tertiary winding.

The transformer (20) according to any one of the preceding claims, wherein:

• the primary windings respectively wound around one of two adjacent limbs are arranged in a way that one of the primary windings is wound close to one of the first and the second half cores while the other primary winding (P1, P3) is wound close to the other one of the first and the second half cores;
• and/or
• the first secondary windings respectively wound around one of two adjacent limbs are arranged in a way that one of the first secondary windings is wound close to one of the first and the second half cores while the other first secondary winding is wound close to the other one of the first and the second half cores.

The transformer (20) according to any one of the preceding claims, wherein the tertiary windings (T1a-T1b, T2a-T2b, T3a-T3b or T1, T2, T3) are respectively composed of two auxiliary windings (T1a, T1b;

• T2a, T2b;
• T3a, T3b), or are respectively a single winding (T1, T2, T3).

The transformer of any preceding claim, the primary windings (P1, P2, P3) and the secondary windings (S1, S2, S3) being coupled in a way to form a first sub-transformer, the primary windings (P1, P2, P3) and tertiary windings (T1a-T1b, T2a-T2b, T3a-T3b or T1, T2, T3) being coupled in a way to form a second sub-transformer, the secondary windings (S1, S2, S3) and tertiary windings (T1a-T1b, T2a-T2b, T3a-T3b or T1, T2, T3) being coupled in a way to form a third sub-transformer;

An electrical system (1) for an electric vehicle or a hybrid electric vehicle, comprising a transformer (20) according to any one of the preceding claims.