Country for PR: Japan
Contributor: Kyodo News JBN
Monday, December 07 2020 - 19:00
Diamond Electric Holdings Develops 7.4 kW Vehicle-to-Everything (V2X) Onboard Charger with World's Highest Power Density
OSAKA, Dec. 7, 2020 /Kyodo JBN-AsiaNet/ --

- 1.2 kW/L V2X OBC Accelerates Penetration of Onboard V2G -

Diamond Electric Holdings (DIAMOND), which holds two core companies, Diamond 
Electric and Tabuchi Electric, announced on December 3 that it has developed a 
7.4 kW vehicle-to-everything (V2X, X stands for Grid, Home, and Load) onboard 
charger (OBC) with the world's highest power density (*1) as high as 1.2 kW/L 
(*2). This product utilizes the battery of the plug-in electric vehicle 
(BEV/PHEV) to provide grid services, serve demand response, and provide backup 
power in an outage. This product complies with UL 9741 to meet America's market 
which leads the making of onboard V2G regulation. The compliance and the high 
power density facilitate the onboard V2X application of this product.


The stabilization of the grid is key to the spread of BEV/PHEV and renewable 
energy. Vehicle-to-grid (V2G) is a significant solution as it enables the 
BEV/PHEV's onboard battery to provide power to stabilize the grid through a 
bidirectional charger. Furthermore, vehicle-to-home (V2H) and vehicle-to-load 
(V2L) has attracted attention in recent years for its ability utilizing the 
BEV/PHEV's onboard battery as anytime backup power. The OBC with 
grid-interconnection capability is essential for penetration of V2X which 
embraces V2G, V2H and V2L.

In response, DIAMOND has developed a 7.4 kW V2X OBC with the world's highest 
power density as high as 1.2 kW/L, power conversion efficiency up to 96.3% 
(*3), three-wire single-phase system compatibility, and 4 kV isolation 
performance. Furthermore, the product is UL 9741 compliant. These features 
facilitate the V2X OBC implementation on EV/PHEV. 

DIAMOND owes the features to the Diamond Electric's proprietary ultra-compact 
isolated bidirectional DCDC converter and inverter utilizing GaN and SiC which 
have been developed since 2017 and its expertise on design and manufacturing of 
automotive electrification products and to Tabuchi Electric's 20+ years of 
experiences on grid interconnection with high power quality.

(*1) As of November 2020, investigated by Diamond Electric
(*2) Calculated by the enclosure size excluding connectors 
(*3) Measured including EMC components

Photo1: With cover

Photo2: Without cover

Expected applications
- Onboard charger for BEV/PHEV
- Stationary hybrid inverter system

Product specifications:



About Diamond Electric Holdings Co., Ltd.
Diamond Electric Holdings, listed on the Tokyo Stock Exchange (6699), holds two 
core companies, Diamond Electric Mfg. Co., Ltd. and Tabuchi Electric Co., Ltd. 
Diamond Electric is a leading manufacturer of ignition coils for automobiles, 
operating for more than 80 years. Tabuchi Electric is a leading manufacturer of 
solar and hybrid inverters. Those two companies work together to develop 
products to realize Diamond Electric Holdings' new vision, "Connect Automotive 
and Home with 'Monozukuri/Manufacturing'," to contribute the development of 
customers and to the enrichment of society, as stated in its mid-term business 
plan "Re-Ignite".

Source: Diamond Electric Holdings Co., Ltd.