Da Lian Da Holdings, an international leading semiconductor component distributor dedicated to the Asia Pacific market, announced that its subsidiary, Youshang, has launched a 6KW high-voltage DC/DC converter solution (STDES-6KWHVDC) based on STM32G4, STW40N95DK5, STPSC40H12CWL and other products from STfa Semiconductor (ST).

Figure 1- Display board diag

ram of 6KW high-voltage DC/DC converter scheme based on ST product by Dalian Youshang

With the popularization of electric vehicles, the development of charging infrastructure has become a key factor in driving the revolution of electric transportation. In this context, DC/DC converters, as an important part of automotive charging systems, are also playing an increasingly important role. In order to meet the needs of users for a faster and more reliable charging experience, Da Lian Da You Shang has launched a 6KW high-voltage DC/DC converter solution (STDES-6KWHVDC) based on products such as ST STM32G4, STW40N95DK5, and STPSC40H12CWL, which can provide an efficient charging experience for electric vehicles.

Figure 2- Scenario application diagram of 6KW high-voltage DC/DC converter scheme based on ST product by Dalian Youshang

The STDES-6KWHVDCDC scheme is equipped with a digitally controlled full bridge LLC resonant converter and uses SiC diodes for output rectification. According to the output voltage requirements, the LLC transformer output configuration can be interchanged between the center tap and the full wave. This can cause frequency reversal, significantly improving efficiency throughout the entire output voltage range. The scheme is equipped with two models: dual transformers for limited voltage (smaller magnetic cores) and single transformers for wide output. Among them, dual transformers are suitable for 200V-500V or 500V-1000V, while single transformer models can be used at 200V-1000V voltage through frequency switching.

In product selection, STW40N95DK5 MDmesh DK5 power MOSFET is used for LLC level, STPSC40H12CWL SiC diode is used for rectification, and STM32G474RET6 MCU is used for management and control. And the auxiliary power supply is based on the secondary GND to supply power to the MOSFET gate driver, microcontroller, and signal conditioner. In addition to the PM8834MTR gate driver IC, the gate drive of LLC MOSFET is also isolated through a gate drive transformer.

Figure 3- Block diagram of a 6KW high-voltage DC/DC converter scheme based on ST products by Dalian Youshang

After testing, this solution has excellent power efficiency, further reflecting the excellent performance of ST products and comprehensive digital control capabilities. It can achieve high efficiency under wide input voltage and load conditions. In the future, the United Nations will also collaborate with ST to launch more power solutions, providing assistance for the transformation of automotive electrification.

Core technological advantages:

6KW high-voltage DC-DC converter based on fully digital LLC topology;

Two models: dual transformers for limited voltage (smaller magnetic cores), single transformers for wide output;

The same PCB can adapt to different magnetic components;

Unique patent control scheme;

Can handle an output voltage range of 200VDC to 1000VDC, with a maximum limit of 12A;

Peak efficiency: 98%;

Digital control, based on STM32G474 microcontroller;

Comprehensive security mechanism.

Scheme specifications:

Input DC voltage from 700VDC to 800VDC;

Peak efficiency at 3KW load>98%;

Peak efficiency at full load>97.5%;

Output voltage 200V-1000V DC;

Maximum output power 6KW (maximum current 12A);

DC/DC converter topology full bridge LLC;

LLC power converter frequency range across the full voltage range;

80Khz – 270Khz (with soft start);

90Khz – 180kHz (1st edition);

90Khz – 140kHz (2nd edition);

Auxiliary power supply input DC voltage 20VDC – 25VDC;

Start: Soft start;

Rectification topology: center tap (200V-500V), full bridge (500V-1000V);

Cooling forced air.

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Regarding Da Lian Da Holdings:

Da Lian Da Holdings is a global leader and the largest semiconductor component distributor in the Asia Pacific region. Headquartered in Taipei (TSE: 3702), it has approximately 5000 employees including Shiping, Pinjia, Quanding, and Youshang. It has over 250 product suppliers and 78 distribution centers worldwide, with a revenue of 25.97 billion US dollars in 2022. Da Lian Da has established an industry holding platform, focusing on international operational scale and localization flexibility. It has been deeply cultivating the Asia Pacific market for a long time, with the vision of "industry first choice and channel benchmark", and fully promoting the core values of "team, integrity, professionalism, and efficiency". It has won the "Youxiu International Brand Distributor Award" for 23 consecutive years. Faced with new manufacturing trends, Dalian University is committed to transforming into a data-driven enterprise, establishing an online digital platform called "Da Da Wang", and advocating for the intelligent logistics service (LaaS, Logistics as a Service) model to assist customers in facing the challenges of intelligent manufacturing together. Starting from benevolence and building trust through technology, the University of the United Nations hopes to collaborate with the industry to build a competitive ecosystem, and actively promote digital transformation with the sixteen character mindset of "focusing on customers, technology empowerment, collaborative ecology, and co creating the era". (* Market ranking based on data released by Gartner in March 2023)