US 12,294,293 B2
Control method and circuit for two-stage current limiting of peak power current
Ye Li, Jiangsu (CN); and Haodan Huang, Jiangsu (CN)
Assigned to WUXI SI-POWER MICRO-ELECTRONICS CO., LTD., Jiangsu (CN)
Appl. No. 18/709,819
Filed by WUXI SI-POWER MICRO-ELECTRONICS CO., LTD., Jiangsu (CN)
PCT Filed Jan. 23, 2024, PCT No. PCT/CN2024/073540
§ 371(c)(1), (2) Date May 14, 2024,
PCT Pub. No. WO2024/244503, PCT Pub. Date Dec. 5, 2024.
Prior Publication US 2024/0421697 A1, Dec. 19, 2024
Int. Cl. H02M 1/32 (2007.01); H02M 3/335 (2006.01)
CPC H02M 1/32 (2013.01) [H02M 3/33507 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A control method for two-stage current limiting of peak power current, comprising the following steps:
Step 1, detecting a load current of a power supply system;
Step 2, judging a load current interval of the power supply system;
Step 3, enabling the power supply system to work in a constant voltage mode when the load current of the power supply system is less than a rated power current; and enabling the power supply system to work in a peak power mode when the load current of the power supply system is greater than the rated power current; and
Step 4, starting a protection program when the load current of the power supply system is continuously greater than the rated power current; wherein
Step 4 comprises:
Step 41, enabling a first constant current loop to intervene and start a first overcurrent timer when the load current of the power supply system is greater than the rated power current and less than the peak power current, enabling the power supply system to stop working and be restarted when the load current is continuously greater than the rated power current and less than the peak power current for more than 1 second, and enabling the first constant current loop to exit and clear the first overcurrent timer if the load current is less than the rated power current during this period; and
Step 42, enabling a second constant current loop to intervene and start a second overcurrent timer when the load current of the power supply system is greater than the peak power current, enabling the power supply system to stop working and be restarted when the load current is continuously greater than the peak power current for more than 20 milliseconds, and enabling the second constant current loop to exit and clear the second overcurrent timer if the load current is less than the peak power current during this period.