US 12,088,200 B2
Boost power conversion circuit, method, inverter, apparatus, and system
Tao Shi, Shanghai (CN); and Jixin Zhu, Dongguan (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Jul. 25, 2022, as Appl. No. 17/872,525.
Application 17/872,525 is a continuation of application No. 16/938,119, filed on Jul. 24, 2020, granted, now 11,418,114.
Application 16/938,119 is a continuation of application No. PCT/CN2019/115075, filed on Nov. 1, 2019.
Claims priority of application No. 201811573498.5 (CN), filed on Dec. 21, 2018.
Prior Publication US 2022/0368227 A1, Nov. 17, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 1/36 (2007.01); H02M 3/07 (2006.01); H02M 7/483 (2007.01); H02M 1/00 (2006.01); H02M 1/32 (2007.01)
CPC H02M 3/158 (2013.01) [H02M 7/4837 (2021.05); H02M 1/0095 (2021.05); H02M 1/32 (2013.01); H02M 1/36 (2013.01); H02M 3/07 (2013.01)] 14 Claims
OG exemplary drawing
 
13. A boost power conversion circuit control method, applied to a boost power conversion circuit, the boost power conversion circuit comprising:
a first switching transistor, a second switching transistor, an inductor, a flying capacitor, a first diode, a second diode, and a voltage control circuit; wherein
the inductor, the first diode, and the second diode are successively connected in series to form a first branch, the first branch is connected in series to an input positive electrode and an input negative electrode of the boost power conversion circuit to form a main circuit, wherein an anode of the first diode is coupled to the input positive electrode of the boost power conversion circuit; the inductor, the first switching transistor, and the second switching transistor are connected in series to form a first closed loop, and the first switching transistor, the second switching transistor, the first diode, and the second diode form a second closed loop; and one end of the flying capacitor is connected to a common point of the first diode and the second diode, and an other end of the flying capacitor is connected to a common point of the first switching transistor and the second switching transistor; and
a first end of the voltage control circuit is connected to a common end of the first diode and the second diode, a second end of the voltage control circuit is connected to a reference point, the reference point is used to provide a clamping potential, and the clamping potential is between a negative bus potential and a positive bus potential; and the voltage control circuit is configured to clamp a voltage of the common point of the first diode and the second diode when a voltage on an input end of the boost power conversion circuit is less than a startup voltage of the boost power conversion circuit,
wherein the voltage control circuit comprises a third closed loop and the third closed loop comprises one of a controllable switching transistor and a compound component to form the third closed loop:
wherein the method comprises:
when a voltage on an input end of the boost power conversion circuit is less than a startup voltage of the boost power conversion circuit, controlling, by the voltage control circuit, a voltage borne by the second diode to be less than a bus voltage of the boost power conversion circuit, wherein the bus voltage is a voltage difference between a positive bus voltage and a negative bus voltage.