US 12,407,171 B2
Power conversion module and power supply system
Lin Li, Shanghai (CN); Zhiwu Xu, Shenzhen (CN); and Haibin Guo, Dongguan (CN)
Assigned to HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Aug. 22, 2023, as Appl. No. 18/453,678.
Application 18/453,678 is a continuation of application No. PCT/CN2022/073902, filed on Jan. 26, 2022.
Claims priority of application No. 202110200485.9 (CN), filed on Feb. 23, 2021.
Prior Publication US 2023/0396068 A1, Dec. 7, 2023
Int. Cl. H02J 3/38 (2006.01); H02M 1/00 (2006.01)
CPC H02J 3/381 (2013.01) [H02J 2300/26 (2020.01); H02J 2300/28 (2020.01); H02M 1/0025 (2021.05); Y02E 10/56 (2013.01); Y02E 10/76 (2013.01)] 20 Claims
OG exemplary drawing
 
8. A power supply system comprising:
a power converter comprising:
a power transistor; and
a sampling controller;
a direct current (DC) bus configured to have a bus reference voltage;
a DC/DC conversion system;
a power supplier coupled in parallel to the DC bus using the power converter and configured to have a maximum power point and a power supply reference voltage;
an energy storage system coupled in parallel to the DC bus using the DC/DC conversion system;
an on/off grid connection box; and
a DC/alternating current (AC) conversion system comprising:
a first end coupled in parallel to the DC bus; and
a second end coupled to an AC load or an AC power grid using the on/off grid connection box,
wherein the sampling controller is configured to:
track the maximum power point;
determine the bus reference voltage and the power supply reference voltage based on the maximum power point;
determine a bus reference duty cycle based on the bus reference voltage;
determine a power supply reference duty cycle based on the power supply reference voltage;
determine a current limiting reference duty cycle based on a preset current-limit value of the power converter;
determine a given duty cycle of the power converter identified from the bus reference duty cycle, the power supply reference duty cycle, and the current limiting reference duty cycle of the power converter;
identify whether the bus reference duty cycle is greater than a current value of the given duty cycle of the power converter;
perform, in response to identifying that the bus reference duty cycle is greater than the current value of the given duty cycle, clearing of an integral input of a linear controller of the power converter used to determine the bus reference duty cycle; and
control, based on the given duty cycle, the power transistor to work to control the DC bus to have a target bus voltage, and enable the power converter to run at the maximum power point.