# US 12,009,674 B2 · Wireless power transmission with modular output

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- Number: US 12,009,674 B2
- Document ID: US12009674B2
- Status: Granted
- Kind: B2
- Application number: 17/120,078
- Filed: 2020-12-11
- Published: 2021-06-17
- Granted: 2024-06-11
- Earliest claimed: 2019-12-13
- Assignees: Puls GmbH
- Applicants: PULS GmbH
- Inventors: Nigel Springett
- Web page: https://patentgrep.com/patent/US12009674B2

## CPC

- H02J 50/12: of the resonant type
- H02M 7/23: arranged for operation in parallel {(H02M7/2176 takes precedence)}
- H02J 2105/44: Portable electronic devices
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

Mobile side circuitry according to claim 2, wherein g=1 and n=r>1.

### Claim 4 (depends on 2)

Mobile side circuitry according to claim 2, wherein g=n>1 and r=1.

### Claim 5 (depends on 2)

Mobile side circuitry according to claim 2, wherein 1<g<n, n mod g=0, and r>1.

### Claim 6 (depends on 4)

Mobile side circuitry according to claim 4, wherein n=2i, i=1, 2, 3, . . . ,
and g=2j, 0≤j≤i−1.