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Main DC-DC Converters

DC-DC IconMain HV DC-to-DC Converters

In an electric vehicle, truck or bus there is both a high and low voltage power system. The HV system is supplied directly from the traction battery, supplying the motor and other large loads; the cabin and battery heater and A/C compressor. For commercial vehicles this extends to the air compressor and hydraulic pump. The low voltage 12 V or 24V system provides power for all other loads in the vehicle.

The LV battery is charged, and the loads supplied by the main DC-DC converter (1-3 kW) when the vehicle is in use, in the same way the alternator supplies the 12 V system in an ICE vehicle. When the vehicle is off the 12 V is maintained by the LV battery. For passenger vehicles the DC-DC converter is more commonly integrated within the OBC than being a standalone module.

Depending on the specific architecture either reinforced isolated or non-isolated supply rails are required to be created from the HV system voltage which makes the 1000 V input capable solutions from Power Integrations ideal.

Reference Designs

Additional Documents
Design
Product
DER-953Q - 100 W Power Supply Replacing 12 V Battery in 400 V BEV System Using InnoSwitch3-AQ (900 V PowiGaN Switch)
Product InnoSwitch3-AQ
RDHP-2254Q - Gate Driver Board for 800 V Battery Electric Vehicle Systems Using SIC1182KQ with On-board Power Supply Using InnoSwitch3-AQ
Product SIC118xKQ, InnoSwitch3-AQ
DER-948Q - 35 W Power Supply for 800 V Bus with 30-1000 VDC Input and 15 V Output Using InnoSwitch3-AQ (1700 V SiC Switch)
Product InnoSwitch3-AQ
RDR-707Q - 9.75 W Non-Isolated Buck Power Supply using Automotive-Qualified LinkSwitch-TN2Q
Product LinkSwitch-TN2Q
DER-913Q - 35 W Power Supply for 800 V Bus with 40-1000 VDC Input Using InnoSwitch3-AQ (1700 V SiC Switch)
Product InnoSwitch3-AQ
RDR-919Q - 60 W Power Supply for 800 V Bus with 50-1000 VDC Input Using InnoSwitch3-AQ (1700 V SiC Switch)
Product InnoSwitch3-AQ
DER-889Q - 15 W Power Supply for 800 V Bus with 30-1200 VDC Input using InnoSwitch3-AQ
Product InnoSwitch3-AQ
DER-719Q - 2.7 W StackFET Buck Power Supply using Automotive-Qualified LinkSwitch-TN2Q
Product LinkSwitch-TN2Q
DER-907Q - 20 W Power Supply for 400 V Bus with Planar Transformer Using InnoSwitch3-AQ
Product InnoSwitch3-AQ
DER-859Q - 30 W Power Supply for 800 V Bus with 30-925 VDC Input Using InnoSwitch3-AQ
Product InnoSwitch3-AQ
RDR-840Q - 30 W Power Supply for 400 V Bus with 30-550 VDC Input Using InnoSwitch3-AQ
Product InnoSwitch3-AQ
DER-844Q - 4.5 W Non-Isolated Buck Power Supply using Automotive-Qualified LinkSwitch-TN2Q
Product LinkSwitch-TN2Q

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