800W PDU


Power Distribution Unit

Powering your UAV the right way

PDU - PMU - power management unit - power distribution unit - UAV - UAS - drone - rugged

800W Power Distribution Unit

The 800W PDU converts unregulated battery voltage down to a set of regulated outputs suitable for distribution within small to medium-sized UAVs.

800W PDU

Three main outputs are provided, each of which may be user-configured for voltage. The avionics and servo power supplies are fully duplicated internally to maximise system reliability through redundancy.

The Power Distribution Unit has dual battery inputs with automatic lossless switchover between the two. An umbilical input ensures that batteries are not depleted during pre-flight checks prior to take-off.

The PDU is a joint project between Millswood Engineering and VISIONAIRtronics.


  • Three independent power supply systems, each with user-configurable output voltage:
    • Avionics: 12 - 28 VDC, 5 Amps (100W max.)
    • Servo: 5 - 12 VDC, 25 Amps (200W max.)
    • Payload: 12 - 28 VDC, 18 Amps (500W max.)

  • Internal duplication of avionics and servo power supplies, with low-loss (ideal diode) combining of power outputs.

  • Dual battery inputs. Battery voltage may range from 24 to 55 VDC. Supported battery types include:
    • LiPo: 8 - 12S
    • LiS: 12 - 20S
    • LiFe: 10 - 15S

  • Umbilical power input: 28 - 65 VDC, nominal 48 VDC.

  • RS232 and CAN monitoring interfaces provide extensive reporting of voltages, currents and internal temperature.

  • Weight: TBA.

  • Dimensions: TBA.

The enclosure and connectors can be fully customised to suit customer requirements. 


Size comparison
PDU; PMU; power distribution unit; power management unit; drone; uav; uas
PDU Front View
PDU; PMU; power distribution unit; power management unit; drone; ua
PDU Rear View
PDU; PMU; power distribution unit; power management unit; drone; ua

Your partner for the critical tasks

Technology - Polyphase switching converter

Using a polyphase DC-DC switching converter has a number of advantages over using separate DC-DC switching converters.

Firstly, size is reduced. This is possible because the switching times of the converters are synchronised, each converter having its own unique phase offset. Input current demand is now evenly distributed over time, and so input capacitance sharing between converters can be realised, knowing that input currents can never be drawn simultaneously. Thus converter input capacitance volume can be reduced by almost a factor of 10 without incurring any performance penalty.

Secondly, the emitted noise spectrum is more predictable and can therefore be controlled more effectively. This is possible because the converters are all synchronised in time, thus ensuring that switching transients never sum unpredictably. This can be best appreciated by considering the system in the frequency domain, and noting that we no longer have multiple impulse spectrums mixing, we have just one. This represents a far simpler problem to solve.

These benefits do not compromise the independence of the individual converters. A load fault on one (or more) of the outputs does not propagate to the others; unaffected outputs retain full voltage and current authority.

For the UAV, a polyphase DC-DC switching converter means reduced size and weight, as well as reduced EMI.

The 800W PDU uses a custom 10-phase DC-DC switching converter.

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