Polyamp AB

Polyamp Power division is specialised in DC-DC converters and power supplies. We design DC/DC converters since 1970-ties, with reputation of very high reliability and electical performance, they are used in systems with high demands.

Polyamp Systems Division are specialised in design of Naval electromagnetic signatures supression for international customers in Navies or shipyards. We also produce a Underwater Electric sensor (UEP) which is mainly used in Naval and in Oil exploration applications.

Polyamp AB is ISO 9001:2008 Certified  >> pdf ISO 9001:2008 Certificate (268 KB)


Power Division


Polyamp Power division specializes in design and production of mainly DC/DC converters and some compatible Power supplies. Our DC/DC converters are used in applications demanding high reliability in rough environments. Thru the years countless applications in sectors like Railway, Energy, Process control, Vehicles, Military, Radio and Telecom etc.

We provide our DC/DC converters to customers worldwide, with an established sales distributor network or directly where we do not have a distributor. Polyamp have three locations; the head office in Sollentuna outside Stockholm, Sweden. We have design and manufacturing of DC/DC converters in Åtvidaberg 230 km south of Stockholm and La Chaux-de-Fonds in Switzerland.

In Sweden we complement our range with high quality brands like Delta Elektronika for Laboratory and power supplies and Powernet for Power supplies, Inverters and special applications power solutions.

System Division


The Systems division of Polyamp specializes in the design, manufacture and supply of Underwater Electromagnetic Signature Management and Control Systems for Worldwide application within the International Naval Industry / International Navy authorities.

The type of systems supplied are Advanced Degaussing systems for surface and submarine naval vessels. Electromagnetic Mine Sweep supply, Underwater Electric Potential (UEP/ELFE) sensors and electomagnetic design and measurment systems.

The SWECADE software can predict and design coil systems, dimension Degaussing systems, control fixed and movable ranges, support signature analyse and document the fleet vessels signature history.

The new PSC-series design - The longer story

The real story behind this change of the PSC-series, is a process that Polyamp started some years ago, with the PSC600-series!
The PSE-series and PSC600-series use so called planar transformers, which are basically printed circuit boards PCB with windings. The advantage is that a planar transformer type becomes thinner and easier to cool. E.g it makes the PSC600-series possible to have 600W in a 38 mm conduction cooled case. Also the insulation system becomes  easier. However due to the production process of the PCBs, it has limits on how many turns you can make. That also limits the possible input/output voltage combinations.
As we have more demand on high input voltages and also output voltages like 110 V the planar transformers become the limiting factor. There are tricks to handle that but it takes time in pre-test and also affect the efficiency and filters of the unit, thus the EMC. We prefered a more straight forward solution of EMC reasons.
psc-series 100-240w
The PSC-series and PSC600-series has the same “infrastructure” with one Driver board that has an insulated internal DC/DC converter that supply the primary Drive circuit for the power semiconductors and a second board which is the Regulation board with alarm and some options. It handles also the front panel LED, Pot and measurement points.

Push-pull principle schemaPush-pull principle schema

By changing the topology from Push-pull (Polyamp first in world with series produced 1974) to Full-bridge on the PSC600-series we doubled the voltage capacity. The insulation stage in the Driver board is crucial for the full bridge topology. You might have noticed that the PSC600-series has both high input and output voltages.  As we are in details, currently the PSC600-series use both Push-pull and Full-bridge depending on input voltage.

Full-bridge principle schemaFull-bridge principle schema

In the PSC600 the planar transformers are large compared to the PSE-series therfore we could not get the same “hedge” by Full-bridge. That is the reason we stick to the Push-pull design however we improved the yield of the planar PCBs by avoiding higher input/output voltages.

The previuos PSC-series had a traditional winded transformer and we used two transformer sizes, one large for the PSC “10TE” and a smaller for “8TE”, 50 – 80 W units (for old designs still in use). This small transformer showed to perform very well if cooled, then we can easily supply up to 300 W.

That fact made Polyamp trying to case everything in the “8TE”, which we succeded. Since the summer 2016 most PSC “10TE” we sold used the new board, so actually this design has been delivered for a while. In this process, new components and methods has been used, which also increased the efficiency. Therfore, in general we have 20-30% less losses than previous PSC-design.

The main difference between PSE and PSC-series is the flexibility in making what the customer likes within the range Box, illustrated above. Of course some models are in competition, then choose the lower price PSE-series.

I would like more information, please contact me!


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