US 12,224,668 B2
Boost converter and method of controlling a boost converter
Yu Wang, Shanghai (CN); Zhiquan Chen, Shanghai (CN); Jie Fu, Shanghai (CN); Shan Wang, Shanghai (CN); and Gang Wang, Shanghai (CN)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 18/014,331
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Jun. 23, 2021, PCT No. PCT/EP2021/067087
§ 371(c)(1), (2) Date Jan. 3, 2023,
PCT Pub. No. WO2022/002710, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 20191390 (EP), filed on Aug. 17, 2020.
Prior Publication US 2023/0299681 A1, Sep. 21, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/36 (2007.01); H05B 45/38 (2020.01)
CPC H02M 3/1588 (2013.01) [H02M 1/36 (2013.01); H05B 45/38 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A boost converter comprising:
a DC input;
a boost inductor and a boost switch connected to the DC input, with a node defined between them;
an output capacitor;
a pre-charging switch connected between the node and the output capacitor, adapted to be conductive to charge the output capacitors from the node in a pre-charge phase, characterized in that:
the pre-charging switch comprises a body diode in the forward direction from the output capacitor to the node;
the boost converter further comprises a third switch in series with the pre-charging switch, having a source terminal connected to the output capacitor, and having a body diode in a forward direction from the node to the output capacitor, wherein the boost switch and the third switch each comprises a GaN switch and the pre-charging switch comprising a silicon MOSFET;
in a pre-charge phase, both the boost switch and third switch are turned off, and the pre-charging switch is operated in a PWM manner to charge the output capacitor, and the body diode of the third switch is adapted to allow a current from the input to the output capacitor when the pre-charging switch is turned on and to block the reverse current from the output capacitor through the body diode of the pre-charging switch when the pre-charging switch is turned off; and
in a boost phase after the pre-charge phase, the pre-charging switch is turned constantly on and the boost switch and the third switch are turned on and off oppositely to implement the boost conversion.