Based in Taiwan and founded in 2002, ANNREN TECHNOLOGIES Co., Ltd., (here after called “AT” )develops and produces battery compatible DC/DC electrical power converters, high efficiency on board chargers, and integrated all-in-one high voltage control units, like PDU, BDU, etc. including fan cooling and liquid cooling systems.

AT designs and manufactures system solutions to the EV OEM world widely. In response to EV industry market trending and customers’ demand changes, AT launched high voltage power distribution units (PDU), battery disconnected units (BDU) for electric vehicle system in 2009. We also devote our R&D team into high voltage on board charger(OBC) & DC/DC converter since 2015. AT has been focused on electric vehicles and green energy products, and providing systematic solutions to worldwide OEM EV automotive.

Our Core Competency: Systematic solutions like PDU, BDU, OBC, DC/DC converter, EVCC and SECC.

Product Categories


On(off) Board Chargers

LV(HV) DC/DC Converters



HV Connector

YEONHO Connector

Battery / BTMS

Energy Storage System (ESS)

We according to SAE / IEC standard design our products, pass EMI, follow up the safety standards. Quality assurance. We provide our esteemed customers safety, security, reliability, trust and service.

Please feel free and contact us for product specification inquiries or OEM / ODM projects customer requirements.