Log in
Forgot password ?
Become a member for free
Sign up
Sign up
New member
Sign up for FREE
New customer
Discover our services
Dynamic quotes 
  1. Homepage
  2. Equities
  3. Japan
  4. Japan Exchange
  5. Hitachi Metals, Ltd.
  6. News
  7. Summary
    5486   JP3786200000


SummaryMost relevantAll NewsOther languagesPress ReleasesOfficial PublicationsSector news

Hitachi Metals : Fraunhofer IISB and Hitachi Metals Develop New Technology to Enhance the Power Density in Compact On-Board Chargers

04/16/2019 | 04:23am EDT
OBC prototypes
Single-phasekilowatts: 3.6 (left)
Three-phasekilowatts: 11 (right)

April 16, 2019 Hitachi Metals, Ltd.

Fraunhofer Institute for Integrated Systems and Device Technology IISB

Fraunhofer IISB and Hitachi Metals Develop New Technology to Enhance the Power Density in Compact On-Board Chargers

Fraunhofer Institute for Integrated Systems and Device Technology IISB (hereinafter, "Fraunhofer IISB") and the Global Research & Innovative Technology Center (hereinafter, "GRIT") of Hitachi Metals, Ltd. (hereinafter, "Hitachi Metals") have jointly developed a technology to enhance the power density in the compact on-board charger (OBC) used in electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs). It has been confirmed that the technology enables the OBC prototype we have created to generate the world's highest*1power density of 3.8 kW/L.


An OBC converts alternating-current voltage to direct-current voltage (i.e., it is an AC/DC converter) to supply power to EV and PHEV batteries. The OBC is required to provide high power output to charge the EV and PHEV batteries in a short period of time, and at the same time it has to be sufficiently compact to keep the space inside the vehicle as large as possible. However, there is a trade-off between high output and compactness of the body, and therefore achieving a good balance between the two has been a challenge.

Against this backdrop, Fraunhofer IISB and Hitachi Metals produced an OBC prototype that delivers both high power output and compactness utilizing our exclusive high power density enhancement technology.


The OBC prototype we have created delivers both high power output and a compact body by combining soft magnetic materials and components developed by Hitachi Metals and Fraunhofer IISB's circuit technology. In concrete terms, we have adopted a nanocrystalline alloy called FINEMET®FT-3K50T for the common-mode choke coils in the input/output noise filter, and another choke coil made with an amorphous powder core HLM50 for rectification and power factor correction. Furthermore, the isolation transformer with resonance inductors made of the low- loss soft ferrite core ML29D is used in the DC/DC converter. In

addition to achieving the world's highest power density of 3.8 kW/L, we have also confirmed 11 kW output and three phase input operation by using parallel connected 3 OBCs. This parallel connection can cover both single- and three-phase AC input to produce a maximum output of 22 kW through six parallel connections.

This flexibility can significantly reduce the OBC design time and costs.

On this joint development achievement, Mr. Kenichi Inoue, the General Manager, GRIT stated: "We are extremely pleased that we could achieve the positive prospect of delivering both high power output and casing compactness for the OBC, which has been a significant challenge over the years. This prototype is a demonstration of the superiority of the characteristic soft magnetic materials and components that Hitachi Metals can produce. We would like to promote new applications of our soft magnetic materials and components toward the further development of xEVs.*2

Also, Dr. Bernd Eckardt, Head of Automotive Electronics, Fraunhofer IISB commented as follows: "By using the advanced magnetic materials of GRIT we were able to realize an ultra-compact and modular OBC with high efficiency. The highly integrated mechatronic design allows an easy scale up in power from 3.6 kW up to 22 kW."

The OBC prototype will be displayed in the Fraunhofer IISB booth and Hitachi Metals at the following exhibitions: PCIM Europe held on May 7, Tue to 9, Thu, 2019 at Exhibition Centre Nuremburg in Germany (Booth number of Fraunhofer IISB: 6.438, Hitachi Metals: 7.306 ).

Switching frequency
Maximum output

[Supplementary Information]

■ Specifications of the OBC prototype

Dimensions200 x 100 x 40 mm / unit

AC/DC: 110-130 kHz

DC/DC: 250-300 kHz

Input: 230 V (AC)

Output: 350-450 V (DC)

3.6 kW (a single unit with single phase input)

22 kW (six units in parallel connection with single/three-phase input)

1 This is the world's highest power density for an in-vehicle charger as of April 16, 2019. Researched by Hitachi Metals.

2 Refers to electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles

[Press inquiries]

Corporate Communications, Hitachi Metals, Ltd. hmcc.sa@hitachi-metals.com

Fraunhofer IISB

Dr. Bernd Eckardt,bernd.eckardt@iisb.fraunhofer.de

About Fraunhofer IISB

As an Institute of the Fraunhofer Research Society with Headquarter in Munich, Germany, the Fraunhofer IISB, located in 91058 Erlangen, Germany, is covering the field of power electronic from material science, semiconductor and interconnection technologies up to automotive and energy power electronics. For more information, visit www.iisb.fraunhofer.de

About Hitachi Metals, Ltd.

Hitachi Metals, Ltd., (TSE: 5486), headquartered in Tokyo, Japan, with consolidated revenue totaling 988 billion yen in fiscal 2017(ended March 31, 2018). The company manufactures and markets a diverse portfolio of advanced metals products, and advanced components and materials.

For more information, visit www.hitachi-metals.co.jp/e/


Hitachi Metals Ltd. published this content on 16 April 2019 and is solely responsible for the information contained herein. Distributed by Public, unedited and unaltered, on 16 April 2019 08:22:02 UTC

ę Publicnow 2019
All news about HITACHI METALS, LTD.
06/22HITACHI METALSá : Chinese Court Enforces Mandatory Licensing For "Essential Faci..
05/27HITACHI METALSá : (Correction) Partial Correction to "Reorganization of Sales Sy..
05/26HITACHI METALSá : Reorganization of Sales System in Japan (Transfer of Business ..
04/28UPDATE2 : Hitachi logs record net profit in FY2020 on IT-related sales
04/28HITACHI METALSá : Bain-led consortium to buy Hitachi Metals for $7.5 billion
04/28UPDATE1 : Hitachi logs record net profit in FY2020 on IT-related sales
04/27NIKKEI 225á : Japanese Shares End Lower as Bank of Japan Retains Monetary Policy
04/26Hitachi Metals Posts Wider Loss in FY21
04/26HITACHI METALSá : Consolidated Financial Report For the Year Ended March 31, 202..
04/09HITACHI METALSá : Corporate Governance Report
More news
Sales 2021 757 B 6 824 M 6 824 M
Net income 2021 -42 356 M -382 M -382 M
Net Debt 2021 135 B 1 215 M 1 215 M
P/E ratio 2021 -21,4x
Yield 2021 0,41%
Capitalization 908 B 8 189 M 8 185 M
EV / Sales 2021 1,38x
EV / Sales 2022 1,17x
Nbr of Employees 28 620
Free-Float 46,3%
Duration : Period :
Hitachi Metals, Ltd. Technical Analysis Chart | MarketScreener
Full-screen chart
Technical analysis trends HITACHI METALS, LTD.
Short TermMid-TermLong Term
Income Statement Evolution
Mean consensus HOLD
Number of Analysts 4
Last Close Price 2 123,00 JPY
Average target price 1 894,25 JPY
Spread / Average Target -10,8%
EPS Revisions
Managers and Directors
Mitsuaki Nishiyama Co-Chairman, CEO & Executive President
Hiroaki Nishioka Chief Financial Officer & Head-Administration
Kenichi Nishiie Co-Chairman
Kazuya Murakami Managing Executive Officer, General Manager-R&D
Ryoichi Aida Chief Quality Officer & Head-Technology
Sector and Competitors
1st jan.Capitalization (M$)
SFS GROUP AG25.33%5 362