Who invented the conversion between voltage source and current source?

Gan Shuai, Liang Keyu, Tu Conghuan, Zhang. According to the announcement issued by Shenzhen Sine Electric Co., Ltd., the switching circuits of voltage source and current source are Gan Shuai, Liang Keyu, Tu Conghuan and Zhang respectively. The applicant company invented in 2022 is Shenzhen Sine Electric Co., Ltd., located in Antuoshan High-tech Industrial Park, Shaer Community, Shajing Street, Baoan District, Shenzhen City, Guangdong Province.