US 12,456,930 B2
Power inverter for use with a hair styling or hair care appliance
Samer Aldhaher, Bath (GB)
Assigned to Dyson Technology Limited, Malmesbury (GB)
Appl. No. 18/563,846
Filed by Dyson Technology Limited, Wiltshire (GB)
PCT Filed May 10, 2022, PCT No. PCT/GB2022/051183
§ 371(c)(1), (2) Date Nov. 22, 2023,
PCT Pub. No. WO2022/248826, PCT Pub. Date Dec. 1, 2022.
Claims priority of application No. 2107563 (GB), filed on May 27, 2021.
Prior Publication US 2024/0235425 A1, Jul. 11, 2024
Int. Cl. H02M 7/5387 (2007.01); A45D 2/36 (2006.01); H02M 1/00 (2006.01); H02M 1/12 (2006.01); H02M 7/48 (2007.01); H02M 7/493 (2007.01)
CPC H02M 7/53871 (2013.01) [A45D 2/367 (2013.01); H02M 1/0048 (2021.05); H02M 1/0058 (2021.05); H02M 1/12 (2013.01); H02M 7/4815 (2021.05); H02M 7/5387 (2013.01); H02M 7/493 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A power inverter comprising:
an input for connection to a DC voltage;
a first inductor and a second inductor, each of the first and the second inductors having a first terminal connected to the input and a second terminal;
a first switch having a first terminal connected to the second terminal of the first inductor and a second terminal connected to a ground;
a second switch having a first terminal connected to the second terminal of the second inductor and a second terminal connected to the ground;
a first capacitor connected in parallel to the first switch;
a second capacitor connected in parallel to the second switch;
a first network having a first terminal connected to the first terminal of the first switch and a second terminal connected to the first terminal of the second switch, the first network comprising a third capacitor, a third inductor and a fourth capacitor connected in series;
a fourth inductor having a first terminal connected to the first terminal of the first network and a second terminal;
a fifth inductor having a first terminal connected to the second terminal of the first network and a second terminal;
a fifth capacitor having a first terminal connected to the second terminal of the fourth inductor, and a second terminal connected to the second terminal of the fifth inductor;
a second network having a first terminal connected to the first terminal of the fifth capacitor and a second terminal connected to the second terminal of the fifth capacitor, the second network comprising a first sub-network, an output capacitor, and a second sub-network connected in series, wherein each of the first and second sub-networks comprises a capacitor and an inductor connected in series;
a pair of outputs, each one of the pair of outputs connected to a respective terminal of the output capacitor; and
a controller for controlling the first and second switches, wherein the first network has a resonant frequency of ω1, the controller switches the first and second switches at a switching frequency of ωS, and a ratio of ω1/ωS is 0.64±20%.