US 12,249,900 B2
Control circuit, control chip and power supply device
Yanmei Guo, Shanghai (CN); Zhen Zhu, Shanghai (CN); Yuehui Li, Shanghai (CN); Yihui Chen, Shanghai (CN); Xiaoru Gao, Shanghai (CN); Haifeng Miao, Shanghai (CN); and Rulong Jiang, Shanghai (CN)
Assigned to SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed by SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed on Aug. 22, 2022, as Appl. No. 17/892,314.
Claims priority of application No. 202110997817.0 (CN), filed on Aug. 27, 2021.
Prior Publication US 2023/0063861 A1, Mar. 2, 2023
Int. Cl. H02M 1/00 (2007.01); H02M 1/32 (2007.01)
CPC H02M 1/0025 (2021.05) [H02M 1/32 (2013.01)] 13 Claims
OG exemplary drawing
 
3. A control circuit, comprising:
an error amplification module configured to: compare a sampled current obtained from an output current with a predetermined current; compare an output power characterizing value that characterizes an output power with a predetermined power; and output an amplified error signal indicating a current-limiting or a power-limiting compensation information;
an addition and subtraction module configured to receive a base voltage, an output voltage characterizing value that characterizes an output voltage feedback and the amplified error signal, wherein a reference voltage signal is generated based on the base voltage, a voltage feedback signal is generated based on the output voltage characterizing value, and wherein when the sampled current is higher than the predetermined current, or when the output power characterizing value is higher than the predetermined power, the addition and subtraction module is configured to increase the voltage feedback signal or to decrease the reference voltage signal;
a comparison module configured to compare the voltage feedback signal with the reference voltage signal and to generate an output feedback signal;
a control module configured to receive the output feedback signal and to generate a control signal for controlling the output voltage so as to cause a voltage of the voltage feedback signal to approach a voltage of the reference voltage signal; and
a reference current generation module coupled to the error amplification module, wherein the reference current generation module is configured to generate a reference current based on the predetermined power, the output voltage characterizing value and the predetermined current, wherein the reference current is a lower one of i) a quotient of the predetermined power and the output voltage characterizing value and ii) the predetermined current.