Wireless power transmission with modular output
Efficient measures to improve electrical performance in a mobile side output circuitry of a wireless power transmission system are provided. The mobile side circuitry of the wireless power transmission system has a mobile side transformer stage comprising at least one primary side winding and a plurality of secondary side windings. To the plurality of secondary side windings there are connected a plurality of mobile side AC/DC converters. According to a first alternative of the present invention output terminal pairs of the plurality of mobile side AC/DC converters are connected in series. According to a second alternative of the present invention output terminal pairs of the plurality of mobile side AC/DC converters are connected in parallel. According to a third alternative of the present invention mobile side AC/DC converters are grouped into a plurality of mobile side output groups such that output terminal pairs within each mobile side output group are connected in series and output terminal pairs of different mobile side output groups are connected in parallel.
1. Mobile side circuitry of a wireless power transmission system, comprising:
a mobile side resonant circuit adapted to inductively couple the mobile side circuitry to a stationary side circuitry of the wireless power transmission system;
a mobile side rectifier stage adapted to rectify an input signal for supply of power to a mobile side load; and
a mobile side transformer stage directly connected at its input side to the mobile side resonant circuit and connected at its output side to the mobile side rectifier stage; wherein
the mobile side transformer stage comprises a same number n>1 of primary side windings and secondary side windings;
the mobile side rectifier stage comprises one mobile side AC/DC converter connected to each secondary side winding; wherein
the mobile side AC/DC converters are realized as synchronous rectifier circuits which are controlled according to a DC output current being measured indirectly through measurement of an input side current of the mobile side rectifier stage; and
output terminal pairs of the plurality of mobile side AC/DC converters are connected in series or output terminal pairs of the plurality of mobile side AC/DC converters are connected in parallel or mobile side AC/DC converters are grouped into a plurality of mobile side output groups such that output terminal pairs within each mobile side output group are connected in series and output terminal pairs of different mobile side output groups are connected in parallel.
2. Mobile side circuitry according to claim 1 , wherein
the number of mobile side output group(s) is g≥1;
the number of mobile side AC/DC converter(s) per mobile side output group is 1≤r≤n;
output terminal pairs of mobile side AC/DC converters in each mobile side output group are connected in series if r>1; and
output terminal pairs of the mobile side groups are connected in parallel if g>1.
3. Mobile side circuitry according to claim 2 , wherein g=1 and n=r>1.
4. Mobile side circuitry according to claim 2 , wherein g=n>1 and r=1.
5. Mobile side circuitry according to claim 2 , wherein 1<g<n, n mod g=0, and r>1.
6. Mobile side circuitry according to claim 4 , wherein n=2 i , i=1, 2, 3, . . . ,
and g=2 j , 0≤j≤i−1.