MULTIPHASE HIGH-PRECISION CURRENT-SHARING CONTROL METHOD APPLIED TO CONSTANT ON-TIME CONTROL

WIPO Patent Application WO/2024/093595

A1

The present invention relates to a multiphase high-precision current-sharing control method applied to constant on-time (COT) control. In the control method, continuously sampled current difference magnitudes between currents and an average current are subjected to a PI compensation module and a low-pass filtering module, so as to obtain an on-time adjustment amount, wherein the value of a reference value Vref of a counter in an on-time control module is controlled by means of a high level of the adjustment amount, and the length of an enabled delay line in a delay line module is controlled by means of a low level thereof; and the counter timing control of the on-time control module is combined with the delay line timing control of the delay line module, thereby improving the control precision of a digital pulse width modulator. The present invention is typically applied to COT control of a Buck converter. Compared with a multiphase COT controller without a current-sharing mechanism, the present invention can make a system ensure, in a steady-state operation condition, that direct current amounts of inductive currents are consistent, thereby improving the stability and reliability of the system.

XU SHEN (CN)
ZHANG HAIQING (CN)
LIU YUJIE (CN)
WANG RUIZHI (CN)
GAO YUAN (CN)
LI YONGJIA (CN)
SUN WEIFENG (CN)
SHI LONGXING (CN)

PCT/CN2023/122090

May 10, 2024

September 27, 2023

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UNIV SOUTHEAST (CN)

H02M3/157; H02M1/00

CN115566898A	2023-01-03
CN109004840A	2018-12-14
CN106257812A	2016-12-28
CN105636303A	2016-06-01
US20200036287A1	2020-01-30

NANJING ZONGHENG INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)

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