US 11,990,826 B2
Power electronics device and method for supplying electrical voltage to a driver circuit of a power semiconductor switch
Burkard Mueller, Kassel (DE)
Assigned to SMA Solar Technology AG, Niestetal (DE)
Filed by SMA Solar Technology AG, Niestetal (DE)
Filed on Aug. 24, 2021, as Appl. No. 17/410,225.
Application 17/410,225 is a continuation of application No. PCT/EP2020/052618, filed on Feb. 3, 2020.
Claims priority of application No. 10 2019 104 652.1 (DE), filed on Feb. 25, 2019.
Prior Publication US 2021/0384824 A1, Dec. 9, 2021
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/0006 (2021.05) 17 Claims
OG exemplary drawing
 
1. A power electronics device, comprising:
a first power semiconductor switch,
a driver circuit configured to drive the first power semiconductor switch, and
an electrical auxiliary circuit arrangement configured to supply electrical voltage to the driver circuit, wherein the auxiliary circuit arrangement comprises:
a supply capacitor,
an auxiliary capacitor,
a normally off auxiliary semiconductor switch, and
a diode and a bootstrap diode,
wherein the auxiliary semiconductor switch is connected to a reference potential connection of the first power semiconductor switch via a first connection point,
wherein, starting from the first connection point, a series connection of the diode, a second connection point and the auxiliary capacitor is arranged in parallel with the auxiliary semiconductor switch such that, when the auxiliary semiconductor switch is in the off state, the auxiliary capacitor is charged by the flow of current through the first power semiconductor switch,
wherein the driver circuit is connected to the supply capacitor for its electrical voltage supply, and
wherein the supply capacitor is electrically connected by a first connection to the second connection point via the bootstrap diode and by a second connection to the reference potential connection, such that, when the auxiliary semiconductor switch is in the on state and the auxiliary capacitor is at least partially charged, the supply capacitor is charged by the auxiliary capacitor via the bootstrap diode.