STDES-6KWHVDCDC

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6 kW high voltage DC-DC converter for EV charging

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Product overview

Description

The STDES-6KWHVDCDC reference design is a 6 kW high voltage DC-DC converter mainly for battery charging in an EV infrastructure.

The reference design consists of a full bridge LLC resonant converter, digitally controlled.

For the output rectification, SiC diodes have been used. Depending on the output voltage requirement, the LLC transformer output configuration is interchangeable between center tapped and full-wave.

This results in frequency fold-back that increases efficiency by a wide margin over an entire output voltage range.

The dual transformer variant is more suited for limited output voltage: 200-500 or 500-1000 V depending on the secondary winding scheme. This scheme also uses smaller cores. The single transformer variant is usable for 200-1000 V with the frequency foldback scheme.

STW40N95DK5 MDmesh DK5 Power MOSFETs are used in the LLC stage while STPSC40H12CWL SiC diodes are used in rectification. The STM32G474RET6 MCU manages the control functions.

The auxiliary power supply is referred to a secondary GND to supply MOSFET gate driver, microcontroller, and signal conditioning.

The gate driving of LLC MOSFETs is isolated through a gate drive transformer in addition to the PM8834MTR gate driver ICs.

Formal testing and measurement results confirm the ability of performance ST power products combined with comprehensive digital control to deliver high efficiency across wide input voltage and load conditions.

  • All features

    • 6 kW high voltage DC-DC converter based on fully digital LLC topology
    • 2 variants: dual transformer (smaller core) for limited voltage, single transformer for wide output
    • Same PCB to accommodate different magnetics for each variant
    • Unique patented control scheme to address output voltage ranging from 200–1000 V DC, with 12 A maximum limit
    • 700–800 V DC input voltage range
    • Peak efficiency: 98%
    • Digitally controlled, based on STM32G474 microcontroller
    • Comprehensive safety mechanism

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade WEEE Compliant Material Declaration**
STDES-6KWHVDCDC
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- Industrial - Yes

STDES-6KWHVDCDC

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Material Declaration**:

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Active

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Grade

Industrial

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-

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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STDES-6KWHVDCDC

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Core Product:

STM32G474RET6, STW40N95DK5, STPSC40H12CWL

Board production status:

Not for sale

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors