Isolated DC/DC converter for fuel cell systems

Name: HIS series isolated DC/DC converter
Brand: HY-PART

HY-PART supplies liquid-cooled isolated DC/DC converters rated 80 kW to 300 kW for hydrogen fuel cell systems, with input 150–550 Vdc, output up to 950 Vdc, and rated efficiency of 97–98%.

Model range

Available ratings

HIS series optimised for efficiency; DIS series adds IP67 sealing and an extended temperature envelope for outdoor and mobile use.

Model	Rated power	Input voltage	Max input current	Output voltage	Efficiency
HIS80-320-800	80 kW	150–550 Vdc	250 A	600–950 Vdc	98%
HIS160-320-800	160 kW	150–550 Vdc	500 A	600–950 Vdc	98%
HIS240-320-800	240 kW	150–550 Vdc	750 A	600–950 Vdc	98%
DIS100-300-800	100 kW	150–500 Vdc	360 A	600–950 Vdc	97%
DIS200-300-800	200 kW	150–500 Vdc	720 A	600–950 Vdc	97%
DIS300-300-800	300 kW	150–500 Vdc	1080 A	600–950 Vdc	97%

Voltage windows shown are nominal catalogue ranges. Custom configurations are available — send us your stack envelope and we will confirm feasibility.

Design

HIS series — high power, liquid cooled, SiC-based

The HIS series is a high-density soft-switching isolated DC/DC converter with integrated 3D liquid cooling. Power density exceeds 6 kW/L and peak efficiency reaches 98.5%. Zero-voltage-switching (ZVS) technology significantly reduces switching loss and electromagnetic interference.

Isolation technology removes insulation risk in the cooling system.

Flexible adaptation — fits fuel cells across power and voltage ranges
Wide application — stationary power, rail, marine, road transport
Custom solutions — tailored to specific power and voltage requirements
Full input-output isolation, 3500 Vdc withstand

Why isolation matters here. An isolated topology separates the stack from the downstream bus, removing the conduction path that can otherwise place stack voltage on the coolant circuit. For hydrogen installations this is a safety requirement, not a performance preference.

DIS series

Environmental and mechanical specification

Parameter	Specification
Protection rating	IP67
Operating temperature	−40 to 65 °C
Max altitude	2000 m
Cooling	Liquid cooling
Communication	CAN 2.0B
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
Auxiliary supply	9–36 Vdc, ≤ 50 W
Options	EIS (electrochemical impedance sensing) available on request

Dimensions and weight

Model	Power	Channels	Dimensions (W×D×H)	Weight
DIS100-300-800	100 kW	1	410 × 360 × 120 mm	25 ± 0.5 kg
DIS200-300-800	200 kW	1 / 2	410 × 650 × 120 mm	45 ± 0.5 kg
DIS300-300-800	300 kW	1	410 × 880 × 120 mm	65 ± 0.5 kg

Non-isolated alternative

H-NS Series Buck-Boost DC/DC Converter

The H-NS series is developed specifically for stationary hydrogen fuel cell power generation and forklift drivetrains, where a non-isolated topology lowers cost and reduces mass without compromising the stack.

Model	Max continuous current	Power range	Input voltage	Output voltage
H-NS120-120-120	120 A	2–4 kW	20–120 V	20–120 V
H-NS120-120-140	140 A	2–8 kW	20–120 V	20–120 V
H-NS170-170-140	140 A	2–8 kW	20–170 V	20–170 V

Typical applications: Stationary fuel cell power generation · Fuel cell forklifts · Backup power systems

Modular series

ZIS Series Modular Isolated DC/DC Converter

The ZIS series is a modular isolated DC/DC converter used for voltage conversion across a wide input range, supporting customer customization in both module and complete-machine form.

Rated power options
600 W
1.2 kW
1.8 kW
2.4 kW
3.0 kW
6 kW
12 kW
18 kW

Rated input voltage

24 V · 48 V · 72 V · 96 V · 108 V · 144 V · 360 V · 540 V · 700 V

Rated output voltage

12 V · 24 V · 48 V · 72 V · 108 V · 144 V · 360 V · 540 V

Installation

Module (integrated into other enclosures) or complete machine with independent enclosure

Cooling

Natural cooling / air cooling / liquid cooling

Selection guidance

DC/DC questions we are asked

How do I choose the right DC/DC converter for my fuel cell stack?

Match three numbers: the stack's continuous rated power, its output voltage window at full and minimum load, and the DC bus voltage your inverter or load expects. The converter must be rated above the stack power, must accept the entire stack voltage window including startup transients, and must regulate to the target bus. If you give us those three figures we will propose the model.

What is the difference between HIS and DIS series converters?

Both are isolated liquid-cooled converters for high-power fuel cell work. The HIS series runs 80 kW to 240 kW with input 150–550 Vdc and reaches 98% rated efficiency. The DIS series runs 100 kW to 300 kW, adds IP67 sealing and a −40 to 65 °C operating range for outdoor and mobile use, with CAN 2.0B communication.

Do you offer non-isolated converters?

Yes. The H-NS buck-boost series is non-isolated, covering 2 kW to 8 kW at 20 V to 170 V, developed for stationary generation and forklift applications where cost and mass matter more than galvanic isolation.

Can the converter be installed as a bare module?

Yes. The ZIS series is available both as a module for integration into your own enclosure and as a complete machine with an independent housing. Cooling options cover natural, air and liquid cooling.

Send us your stack specification

Rated power, output voltage window and your DC bus voltage are enough for us to propose a model and lead time.

Request a quote Email us