Drivelines of HEV, BEV and FCV
DNB Non-isolated DC/DC Converter
150 kW bidirectional · 200–454 Vdc in · 500–900 Vdc out
Power conversion — DC/DC
Overview
8-phase interleaved Buck-Boost topology with 45° phase shift per phase and bidirectional power flow. SiC devices for low switching loss, switching frequency up to 70 kHz and ultra-low output current ripple. Peak efficiency above 98.5% with soft-switching design, high power density and good EMC performance.
Key features
- Bidirectional power flow — energy moves both ways between buses
- Galvanic isolation between control circuit and power stage
- SiC devices, switching frequency up to 70 kHz
- Operating modes: bidirectional CV, CC on the low side, CP on both sides
Specification
Technical data
Technical parameters — DNB150-454-750
| Parameter | Value |
|---|---|
| Low-side voltage range | 200–454 Vdc |
| Maximum input current | 350 A |
| Output voltage range | 500–900 Vdc |
| Rated input power | 150 kW |
| Rated efficiency | > 98% |
| Auxiliary power | 18–36 VDC, ≤ 20 W |
| Operating modes | Bidirectional CV; CC on low side; CP on low and high side |
| Protection | Undervoltage, overvoltage, overcurrent, communication fault, overtemperature, output short-circuit |
| Protection level | IP67 |
| Operating temperature | −40…+65 °C · altitude 2000 m |
| Cooling / communication | Liquid cooling · CAN 2.0B |
| Dimensions / weight | 410×360×125 mm · 25 ± 0.5 kg |
| Reference standards | GB/T 24347-2021, EN 62477, ECE-R10, EN 50121, GB/T 18488, GB/T 18384, QC/T 413, QC/T 895, GB/T 18655, GB/T 17619 |
| Optional functions | EIS, ISO, input pre-charge, stack discharge, PDU, direct copper busbar connection |
Application
Where it is used
Interconnects on-board energy sources of different voltages — supercapacitors and batteries
Paralleling of multiple battery clusters to the DC link
Power interface between fuel cells and high-voltage batteries for power distribution
More in dc/dc converters
Related reading
From the engineering notes
Background on the design decisions behind this component — all articles.
Isolated vs non-isolated DC/DC for fuel cell systems
The topology choice affects safety, cost and coolant insulation. Here is how to decide for your application.
Isolated DC-DC first, then the coolant piping
The 100 Ω/V and 500 Ω/V rules come from touch-safety limits, not from the converter. Worked numbers for a 500 V stack on an 800 V bus, and what they mean for hose length and rigid tube.
DNB Non-isolated DC/DC Converter — product brochure (PDF)
Full specifications, model selection tables and engineering notes. Two pages, English.
Download PDF
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