US 12,034,366 B2
Startup control method and system
Xiaolei Wang, Shanghai (CN); Peng Zhu, Shanghai (CN); Jianpeng Lin, Shanghai (CN); Haixin Wu, Shanghai (CN); and Hao Sun, Shanghai (CN)
Assigned to DELTA ELECTRONICS (SHANGHAI) CO., LTD., Shanghai (CN)
Filed by Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Sep. 18, 2023, as Appl. No. 18/468,745.
Application 18/468,745 is a division of application No. 17/446,305, filed on Aug. 30, 2021, granted, now 11,804,772.
Claims priority of application No. 202010936896.X (CN), filed on Sep. 8, 2020.
Prior Publication US 2024/0006985 A1, Jan. 4, 2024
Int. Cl. H02M 1/36 (2007.01); G01R 19/04 (2006.01); H02M 1/088 (2006.01); H02M 3/335 (2006.01)
CPC H02M 1/36 (2013.01) [G01R 19/04 (2013.01); H02M 1/088 (2013.01); H02M 3/33576 (2013.01); H02M 3/33584 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A startup control method for a DC/DC converter, which is applied to a startup process of the DC/DC converter with energy transferred from a high-voltage side to a low-voltage side, comprising:
using a voltage spike measurement unit to acquire a voltage spike measurement value of a power switch at the low-voltage side;
determining a duty cycle of a driving signal according to the voltage spike measurement value and a preset voltage; and
outputting the driving signal to control a power switch at the high-voltage side, thereby charging a clamping capacitor of the power switch at the low-voltage side,
wherein the duty cycle of the driving signal is gradually increased from zero, and when a difference between the voltage spike measurement values obtained in two adjacent samplings is greater than or equal to a first preset voltage, the duty cycle of the driving signal is controlled to be unchanged until the voltage spike measurement value is greater than or equal to a second preset voltage, then the outputting of the driving signal is stopped.