The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 2023
Filed:
Jun. 30, 2022
Shenzhen Sunmoon Microelectronics Co., Ltd., Guangdong, CN;
Zhaohua Li, Guangdong, CN;
SHENZHEN SUNMOON MICROELECTRONICS CO., LTD., Shenzhen, CN;
Abstract
This application provides a constant-current drive circuit. First, the voltage at the input end is collected through peak-voltage sample and hold module to generate the input-voltage sampling signal, and the hold voltage at the current moment is obtained by calculating an average of the peak voltage of the input-voltage sampling signal and the hold voltage at the previous moment, and output as the output voltage signal to the voltage-controlled current source module. Then, a corresponding current signal is generated through the voltage-controlled current source module according to the output voltage signal and the preset second threshold voltage, and a mirror operation is performed on the current signal through the constant-current threshold control module to generate the mirrored current signal, and according to the mirrored current signal, the constant-current threshold is adjusted, so as to maintain the operation current flowing through the load a constant-current.