US 12,230,994 B2
Pulse charging of a capacitor
Ian Anthony Moore, Chelmsford (GB); Michael James Parker, Chelmsford (GB); Daniel James Scott, Chelmsford (GB); and Stuart James Toms, Chelmsford (GB)
Assigned to BAE SYSTEMS PLC, London (GB)
Appl. No. 17/596,220
Filed by BAE SYSTEMS plc, London (GB)
PCT Filed Jun. 4, 2020, PCT No. PCT/GB2020/051351
§ 371(c)(1), (2) Date Dec. 6, 2021,
PCT Pub. No. WO2020/249929, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 1908770 (GB), filed on Jun. 13, 2019.
Prior Publication US 2022/0302742 A1, Sep. 22, 2022
Int. Cl. H02J 7/00 (2006.01); H01F 27/28 (2006.01); H01F 38/00 (2006.01); H02J 7/34 (2006.01); H03K 3/53 (2006.01); H01F 30/00 (2006.01)
CPC H02J 7/345 (2013.01) [H01F 27/2895 (2013.01); H01F 38/00 (2013.01); H02J 7/00711 (2020.01); H03K 3/53 (2013.01); H01F 30/00 (2013.01); H02J 2207/50 (2020.01)] 11 Claims
OG exemplary drawing
 
1. An apparatus for pulse charging of a load capacitor, the apparatus comprising:
a ferrous cored transformer having a primary winding, a secondary winding, and a coupling coefficient between the primary winding and the secondary winding;
a primary circuit connected to the primary winding, the primary circuit configured to carry a first voltage;
a secondary circuit connected to the secondary winding, the secondary circuit comprising the load capacitor, the secondary circuit configured to carry a second voltage having a first resonant peak while the first voltage is non-zero and a second resonant peak while the first voltage is zero; and
an uncoupled inductance in the primary circuit, the uncoupled inductance being magnetically uncoupled from the primary winding and the secondary winding and having a value wherein a coupling coefficient between the primary circuit and the secondary circuit is 0.6 and the coupling coefficient between the primary winding and the secondary winding is greater than 0.6 such that the load capacitor charges on the second resonant peak of the secondary voltage while the first voltage is zero.