Premium PSU Rail, 800 VDC and Rugged Power Conversion

Premium PSU · Power it

Rugged, high-performance power conversion

The railway is Premium PSU's home. Its DC/DC converters, inverters and chargers have run rolling stock for four decades, built to EN 50155 for the shock, the vibration and the battery swings of a working railway. The same engineering now powers substations, electric work trucks, semiconductor tools and the 800 VDC data center.

Designed, built and tested in Barcelona, from 50 W to 72 kW, as catalog product or a design made to your spec. Dynamic is the Premium rep for Northern California and Northern Nevada, and rail is where most of our Premium work runs.

Rail and transit power 800 VDC data center power Talk through your power architecture

Premium sealed high-voltage DC/DC converter with circular connectors

50 W to 72 kWMore than 250 standard models, from board-level control power to modular systems.

Rail-provenEN 50155, EN 45545-2 and EN 61373: electronics, fire and smoke, shock and vibration.

900+ custom designsAbout 50 of Premium's 130 people are in R&D. Custom is the operating model.

Tested in-houseSemi-anechoic EMC chamber, climatic chambers and dielectric testing to 15 kV.

Rail and transit power

Premium's home turf, and where most of our Premium work runs

Rolling stock is the hardest place to put power electronics: a battery that swings with every start, a catenary that spikes, shock and vibration all day, fire and smoke rules inside the car, and a service life measured in decades. Premium has built onboard and wayside power for that world for more than 40 years, for locomotive, metro, tram and regional fleets, and for the retrofit programs that keep older cars running.

One part number for every train battery

Train batteries run at 24 V on trams, 48 V on metros and 72 or 110 V on regional and mainline fleets, and EN 50155 asks the electronics to ride from 0.7 to 1.25 times nominal, with 1.4 times for a second. The CLS family takes 16.8 to 137.5 VDC on one input, so one part number covers the whole fleet.

CLS: 40 to 500 W, up to 95 percent efficient. CRS: 60 to 2,000 W for HVAC and heavy loads. CTS: full galvanic isolation where it is specified.

Straight off the 600 and 750 V catenary

Auxiliary loads can come straight off the overhead line instead of the traction chain. The CVS converter takes the catenary directly, and the catenary inverters make three-phase AC for HVAC and auxiliary motors.

CVS-280: 400 to 1,100 VDC in, 400 W peak for 500 ms. OVX-6400: 6.4 kVA three-phase from 400 to 1,000 VDC, parallel up to four. NP-0827: 35 kW from 420 to 900 VDC.

HVAC, doors, information and emergency power

Pure sine inverters for passenger outlets and emergency HVAC, frequency converters for compressors, onboard chargers and DC UPS for the battery and the systems that cannot drop, and starters for diesel and hybrid units.

TDS and TDX-3300: 3.3 kW, 5 to 75 Hz for HVAC compressors. CBS-10K: 10 kW peak for 40 seconds to start a generator. ACB-3000: AC transfer in under 2 ms.

The standards your spec will name: EN 50155 rolling stock electronics, EN 45545-2 fire and smoke, EN 61373 shock and vibration, EN 50121-3-2 and EN 50124-1 EMC and insulation, EN 50163 supply voltages, RIA 12 surge. Temperature to the EN 50155 TX class, -40 to +85 °C. RS-232, CAN, ModBus, Ethernet/IP and TRDP for the train network. See the rest of the vehicle on our transportation page.

800 VDC data center power

Everything around the rack still needs power

AI racks have pushed data center power past 48 V to 800 VDC, which carries twice the power of a 400 VDC bus at the same current and takes copper out of the building. That puts a high-voltage DC bus next to equipment designed around an AC feed: the cooling, the pumps and fans, the controls and the storage. Premium already ships released products for that input range, because rail got there first. A 750 VDC catenary is the same conversion problem, with more vibration and a wider temperature swing.

Run AC cooling loads off the 800 VDC bus

Pumps, fans and compressors are the largest load in the data center still running on AC. A Premium inverter takes the high-voltage DC bus and makes three-phase AC for them, so the cooling plant does not need its own AC distribution.

NP-0827: 420 to 900 VDC in, 400 VAC three-phase out, 35 kW continuous, 70 kW peak. OVX-6400: 400 to 1,000 VDC in, 6.4 kVA, parallel up to four.

Control power off the high-voltage bus

Controllers, sensors and network gear inside a CDU, chiller or power skid still need 24 V. A DC/DC converter takes it straight off the bus, so the equipment does not need an AC feed just for its controls.

CVS-280: 400 to 1,100 VDC in. CMS-2000: 180 to 950 VDC in, 2 kW, sealed to IP67 and IP69K.

Rectifiers, storage and ride-through

Hot-swap rectifier modules that share current and report over PMBus, bidirectional conversion for battery storage, and DC UPS for the controls and network layer that cannot drop when the bus moves.

Rectifier modules: 3 kW each, parallel to 72 kW with hot swap. BBC-30K: 150 to 1,000 VDC, 30 kW, bidirectional, 95.5 percent.

Who we are talking to: the builders of coolant distribution units, chillers, fan walls and liquid-cooled racks, and the companies bringing DC power equipment into the data center. If your next design has to run on an 800 VDC bus, send us the one-line. See the whole building on our data center page.

What Premium builds

Catalog, modified standard or custom, in five families

Premium ODX-6000 three-phase DC/AC inverter

DC/AC inverters

Pure sine single and three-phase inverters from 260 VA to 35 kW, from a 12 V battery to a 1,000 VDC catenary, for passenger outlets, tools, motors and HVAC.

ODX-6000: 6 kVA three-phase, 94.3 percent, THD under 2 percent, parallel to four
Adjustable voltage and 5 to 75 Hz output, 400 Hz on request
Inrush limiters and AC transfer switches to match

See the products

DC/DC converters

Isolated converters from 40 W to 10 kW peak, with inputs from 16.8 VDC on a tram battery to 1,100 VDC on a catenary.

CLS: one input for 24 to 110 V train batteries
CRS-2000: 2 kW on silicon carbide, hold-up at full power
CMS-2000: 180 to 950 VDC, CAN J1939, IP67 and IP69K

See the products

Premium thyristor rectifier and battery charger cabinet

Chargers and rectifiers

Onboard chargers and smart UPS from 120 W, traction battery chargers to 10 kW, and substation rectifier systems built from 3 kW hot-swap modules.

Rectifier modules parallel to 24 units and 72 kW, monitored over PMBus
Temperature-compensated charging for lead-acid and lithium iron phosphate
Isolation to 10 kVAC on the substation UPS

See the products

DC UPS and redundancy

Battery-backed DC supplies and redundancy for the controls and network layers that cannot drop.

N+1 hot-swap DC/DC subrack
MOSFET redundancy modules at about a tenth of diode losses
AC static transfer in under 2 ms

See the products

Premium TDS variable frequency converter

Frequency converters and drives

Frequency converters and drives for HVAC compressors, ventilation and traction auxiliaries, with the same rail-grade build.

TDS and TDX-3300: 3.3 kW from three-phase AC or 400 to 740 VDC
VDX-10K: 10 kW, 5 to 100 Hz motor drive
Run a compressor straight from a high-voltage battery

See the products

Also from Premium: DIN rail AC/DC power supplies and electronic fuses for control panels, and a sealed IP68 AC/DC supply.

The engineering behind it

Why it survives where a catalog supply does not

-50 to +85 °COperating range across the rugged families, up to IP68.

Isolation to 20 kV peakInput, output and ground, for substation and medium-voltage sites.

1 MHz planar magneticsResonant three-phase topologies that put more watts in less space.

Silicon carbide and GaNSiC in the 2 kW rail converter, published research on GaN multilevel converters.

Three ways to coolNatural convection, forced air or conduction to a cold plate.

On the networkRS-232, CAN, ModBus, ProfiBus, Ethernet/IP and TRDP, with remote monitoring.

Questions engineers ask us

Straight answers on Premium power conversion

What power supply covers 24, 48, 72 and 110 V train batteries with one part number?

Premium's CLS family of EN 50155 DC/DC converters takes 16.8 to 137.5 VDC on a single input, which covers every common rolling-stock battery from 24 to 110 V. The family runs from 40 to 500 W at up to 95 percent efficiency.

How do you power train auxiliaries directly from a 600 or 750 VDC catenary?

Use a converter or inverter rated for the catenary itself. Premium's CVS-280 DC/DC converter takes 400 to 1,100 VDC, the OVX-6400 inverter makes 6.4 kVA of three-phase AC from 400 to 1,000 VDC and parallels up to four, and the NP-0827 delivers 35 kW from 420 to 900 VDC.

Can an inverter run data center cooling loads from an 800 VDC bus?

Yes. Premium's NP-0827 inverter takes 420 to 900 VDC and delivers 400 VAC three-phase at 35 kW continuous and 70 kW peak, enough for pumps, fans and compressors. For smaller loads the OVX-6400 delivers 6.4 kVA from 400 to 1,000 VDC.

What powers substation protection relays and DC secure lines?

Battery chargers and rectifier systems on the station's 48, 110 or 125 VDC bus. Premium builds them from 3 kW hot-swap rectifier modules that parallel to 72 kW and report over PMBus, with isolation up to 20 kV peak on its energy products.

Can an electric work truck run welders and compressors from its battery?

Yes, with a three-phase inverter sized for motor starting. Premium's ODX-6000 delivers 6 kVA of pure sine three-phase AC at 94.3 percent efficiency and parallels up to four units. Premium has customers who build electric mining vehicles and run welders and compressors this way.

Who supports Premium PSU in Northern California and Nevada?

Dynamic Measurement and Control Solutions is the Premium PSU representative for Northern California and Northern Nevada. We work through the spec with you and the factory in Barcelona, from catalog parts to custom designs.

Rugged, high-performance power conversion