US 12,406,609 B2
Electromagnetic interference modulation circuit, power management chip and display device
Yayun Yu, Guangdong (CN); and Mingjong Jou, Guangdong (CN)
Assigned to TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., Guangdong (CN)
Filed on Apr. 24, 2023, as Appl. No. 18/305,401.
Claims priority of application No. 202211358173.1 (CN), filed on Nov. 1, 2022.
Prior Publication US 2024/0144852 A1, May 2, 2024
Int. Cl. G09G 3/20 (2006.01); G06F 1/26 (2006.01); G06F 1/3203 (2019.01); H02M 1/00 (2007.01); H02M 1/44 (2007.01); H03K 17/16 (2006.01); H03K 19/003 (2006.01)
CPC G09G 3/2092 (2013.01) [G06F 1/26 (2013.01); G06F 1/3203 (2013.01); H02M 1/0003 (2021.05); H02M 1/0016 (2021.05); H02M 1/0025 (2021.05); H02M 1/0029 (2021.05); H02M 1/44 (2013.01); H03K 17/16 (2013.01); H03K 17/165 (2013.01); H03K 17/166 (2013.01); H03K 19/00346 (2013.01); G09G 2330/021 (2013.01); G09G 2330/06 (2013.01); H03K 2217/0081 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electromagnetic interference modulation circuit, comprising:
a slew rate adjustment circuit, configured to generate a plurality of electromagnetic interference modulation signals, and output an electromagnetic interference modulation signal corresponding to a selecting signal;
a power stage circuit, connected to the slew rate adjustment circuit and an output end, configured to output a voltage signal to the output end according to the electromagnetic interference modulation signal; and
a sampling feedback circuit, electrically connected to the power stage circuit and the output end, configured to obtain the voltage signal and provide a duty cycle modulation signal to the power stage circuit according to the voltage signal,
wherein the slew rate adjustment circuit further comprises a plurality of electromagnetic interference modulation units, all electrically connected with the power stage circuit, configured to control a corresponding electromagnetic interference modulation unit to output the electromagnetic interference modulation signal according to the selecting signal,
wherein each of the plurality of electromagnetic interference modulation units comprises a first transistor and a second transistor in a push-pull form and configured to amplify signals at gates of the first transistor and the second transistor.