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  • military power{ Reliable Power. Reliable Source }

  • About On Systems. {

  • On Systems are leading designers and

    manufacturers of COTS power supplies and

    complete power conversion equipment for

    harsh military environments including Land,

    Sea and Air applications.

    Focussed entirely on power conversion, our highly experienced team can work with you to ensure that your power conversion requirement is delivered on time and on budget, by utilising a combination of standard COTS modules and semi custom design capabilities.

    Our comprehensive range of standard, high quality AC-DC and DC-DC converters, ranging from PCB mounted units of a few watts to large system units of several kW, significantly shorten the development time, ensuring that the most cost effective, reliable, low risk, compliant power converters are selected from the outset of a program.

  • Fully compliant productOur thorough knowledge of the harsh environments required for Military

    COTS power supplies drives our development teams to deliver standard

    products that meet the rigours of:

    DEF-STAN 61-5 Issue 6, DO-160,

    MIL-STD 1275 and MIL-STD 704

    surges and transients that protect

    your equipment from electrical

    damage.

    Standard EMC filters and modules

    ensure compliance to DEF-STD

    59-411 Land Class A, MIL-STD

    461 and TEMPEST, our team

    can work with you to select the

    optimum filter using our in house

    pre-compliance EMC test facility.

    DEF-STAN 0035, DO 160

    and MIL-STD 810 Harsh

    environmental specifications

    are met with standard product

    and are supported for use in

    your product with our detailed

    application notes.

    SURGES AND TRANSIENTS

    DEF-STAN 61-5 Issue 6

    MIL-STD 1275

    MIL-STD 704

    EMC AND IMMUNITY

    DEF-STAN 59-411 Land Class A

    MIL-STD 461

    TEMPEST

    ENVIRONMENTAL

    DEF-STD 0035

    MIL-STD 810

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  • Our in house development team

    uses a comprehensive range

    of software products to model

    your requirement. This up front

    design capability ensures that

    the optimum design is chosen

    very early on in a program to

    significantly reduce the design

    effort of using standard modules

    or providing a complete power

    convertor product.

    All of our standard Military COTS

    products are available as 3D solid

    models to reduce your design in

    effort backed by industry leading

    technical support.

    Comprehensive design capabilities

    and engineering expertise

    Although many applications can

    be satisfied using our range of

    standard building block modules,

    increasingly scarce in house

    resource can be freed up by

    outsourcing the entire power

    supply system.

    We offer a highly controlled,

    project managed design resource

    that can work with you from initial

    design concept to final delivery of

    a fully compliant power supply or

    power system. All of our semi-

    custom designs follow our strict

    QMS procedures and are supplied

    with thorough Design Verification

    Testing (DVT) and type test.

    Semi-custom design capability

    High quality products

    Designed and manufactured in the UK to our strict Quality Management

    processes of BS EN 9100, ISO14001, IPC-A-610 and J-STD-001 our military

    COTS power supplies offer a fully traceable bill of materials with high levels

    of workmanship ensuring long service life.

    Gated design process

    Initial Concept

    Specification & Proposal

    Product Design & 3D Models

    DVT & Prototype

    Product Approval

    Released to Production

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  • Thorough in house

    test capability

    All of our units are subjected to

    thorough testing using our in

    house test capabilities providing

    full parametric operational test

    results. This thorough testing

    virtually eliminates infant

    mortality whilst still maintaining

    a cost effective product is

    repeatedly delivered.

    Urgent Operational

    Requirement (UOR)

    support

    Our UK based design team can

    react quickly to support your

    UOR requirements by offering a

    fast track, immediate response to

    your power supply needs. Fast

    delivery of standard or modified

    stock products, matched by

    a dynamic procurement and

    supply chain management team

    dramatically shortens design-in

    and production supply times.

    Design with

    confidence

    All of our Military COTS power

    supplies are free from ITAR

    restrictions and can therefore be

    used with confidence in any UK

    military program without the

    fear of any future restriction of

    supply.

    Leading edge R&D and business focus

    We consistently invest in R&D to ensure that we provide industry leading

    products that offer high efficiency, high power density off the shelf products

    that maintain our ethos of COTS power supplies.

    Working closely with customers, suppliers and industry champions we

    continuously improve the key attributes required to grow our portfolio

    of products and our business with strategically important customers and

    contracts in the military market.

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  • Useful Reference Guide to Military SpecificationsThere are two commonly used specifications in the military market; UK MOD DEF-STANs and USA MIL-STDs.

    This guide serves to demonstrate some of the key factors that need to be considered when choosing

    a power supply for electronic equipment.

    Surges and TransientsMost military vehicles are 24V DC systems, commonly referred to as 28V systems. Connected electrical equipment has to meet MIL-STD-1275

    and DEF-STAN 61-5 part 6, Avionic equipment has to meet MIL-STD-704.

    The figures below show the surges and transients associated with MIL-STD-1275.

    Mil 1275 D surges and Transients for Normal Mode and Generator Mode

    0

    -250

    -300

    -200

    -150

    -100

    -50

    0

    50

    100

    150

    200

    250

    300

    100 200 300 400 500 600 700 800 900 1000

    RECOVERY TIME (mS)

    Envelope of Spikes in Normal Operating Mode for 28 VDC Systems

    VO

    LTS

    250V, 70s

    -250V, 70s

    40V, 1mS

    25V TO 30V

    -40V, 1mS

    STEADY STATE VOLTAGE

    0

    -250

    -300

    -200

    -150

    -100

    -50

    0

    50

    100

    150

    200

    250

    300

    100 200 300 400 500 600 700 800 900 1000

    RECOVERY TIME (mS)

    Envelope of Spikes in Generator-only Mode for 28 VDC Systems

    VO

    LTS

    250V, 70s

    -250V, 70s

    100V, 1mS

    23V TO 33V

    -100V, 1mS

    STEADY STATE VOLTAGE

    DEF-STAN 61-5 part 6 issue 6This standard covers both 12V and 24V vehicle systems. It differentiates between the voltages seen in the vehicle original fit equipment,

    (Platform) and those seen by any externally connected equipment (Terminal).

    On Systems power supplies are designed to meet the harsher Platform equipment levels as standard.

    PLATFORM AND TERMINAL EQUIPMENT OPERATING VOLTAGES

    NOMINAL 12V NOMINAL 24V

    TERMINAL EQUIPMENT

    PLATFORM EQUIPMENT

    TERMINAL EQUIPMENT

    PLATFORM EQUIPMENT

    LOWER VOLTAGE 9V 9V 18V 18V

    UPPER VOLTAGE 16V 19V 32V 38V

    0

    5

    0

    10

    15

    20

    25

    30

    35

    40

    45

    100 200 300 400 500 600 700 800 900 1000

    RECOVERY TIME (mS)

    Envelope of Surges in Normal Operating Mode for 28 VDC Systems

    VO

    LTS

    40V, 50mS

    18V, 500mS

    32V, 500mS

    23V, 600mS

    STEADY STATE VOLTAGE LIMITS

    32V30V

    23V25V

    18V

    0

    10

    0

    20

    30

    40

    50

    60

    70

    80

    90

    100

    110

    100 200 300 400 500 600 700 800 900 1000

    RECOVERY TIME (mS)

    Envelope of Surges in Generator-only Mode for 28 VDC Systems

    VO

    LTS

    100V, 50mS

    STEADY STATE VOLTAGE LIMITS

    40V

    33V

    16V23V

    15V

    40V, 500mS

    16V, 600mS15V, 500mS

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  • Short Transients

    SurgesThe figures below show the harsher surges and long transients for terminal equipment in 12V and 24V vehicles.

    0.001

    0

    5

    10

    15

    20

    25

    0.1 1.00.01

    RECOVERY TIME (SECONDS)

    DETA03.A 12V LIMITS

    PEA

    K V

    OLT

    AG

    E (V

    OLT

    S)

    20V, 0.05s

    16V, 0.1s

    11.5V, 0.5s

    15V, 1.0s

    12.5V, 1.0s

    STEADY STATE >1s

    DETA03.A 24V LIMITS

    0.001

    0

    10

    20

    30

    40

    50

    0.1 1.00.01

    RECOVERY TIME (SECONDS)

    PEA

    K V

    OLT

    AG

    E (V

    OLT

    S)