http://www.elecfans.com/led/ledzhaoming/616556_2.html

Established in 2006,is specialized in the
Developing and manufacturing of current mutual inductor, high and low frequency
Transformer, inductor,and filter, with factories strategically located in Shanghai
& Ningbo China, reaching a yearly production of over 30 million pieces.

https://wenku.baidu.com/view/39199eb4d0d233d4b14e69cc.html?rec_flag=default
PWM调光

Hello, S,
my name is Li Mengen. I work in Hangzhou AD.
I am currently responsible for PL with SL.