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  • lifw2498
    (http://www.emergencyleddriver.com/emerge)
    http://www.emergencyleddriver.com/emerge


    Üyelik Tarihi: 21-10-2021
    Doğum Tarihi: 02-01-1995 - [Şu anda 26 yaşında]
    Şu anki Tarih: 30-11-2021 Saat: 05:50
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    lifw2498' Forum Bilgileri
    Kayıt Tarihi: 21-10-2021
    Son Ziyareti: 22-10-2021Saat:06:05
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    lifw2498 İletişim Bilgileri
    Web Sitesi: http://www.emergencyleddriver.com/emergency-led-driver/
    Skype ID: http://www.emergencyleddriver.com/emergency-led-driver/
    Google Hangouts ID: http://www.emergencyleddriver.com/emergency-led-driver/
      
    lifw2498, Hakkında Kişisel Bilgiler
    Yer: http://www.emergencyleddriver.com/emergency-led-driver/
    Biyografi:


    WILMINGTON, Mass.--(BUSINESS WIRE)--Jul 31, 2017--Osram, a leading

    global lighting and technology company, today announced its

    OPTOTRONIC?Dual-Mode Programmable

    [url=http://www.emergencyleddriver.com/emergency-led-driver/]Emergency

    LED Driver[/url], the market’s first programmable single-driver

    solution for emergency Solid State Lighting fixtures, which offers the

    ability to program and customize the light output in both normal and

    emergency operations.A separate snap-on battery pack with harness,

    available in slim, linear and compact options, powers emergency

    lighting in the event of an outage and provides up to 18W in back-up

    mode. The complete solution reduces the number of components required

    per emergency luminaire, substantially simplifies in-fixture wiring,

    and enables OEMs to better tailor their fixtures to application

    requirements while reducing the number of SKUs they must inventory.






    Industry’s First Dual-Mode LED Driver with Programmable Emergency

    Light Levels Offers OEMs Greater Flexibility, Simplifies Manufacturing

    (Photo: Business Wire)






    “Emergency lighting luminaires typically require a dedicated

    emergency driver, a dedicated LED driver and numerous wiring

    connections, creating a complex manufacturing process and often

    compatibility issues for OEMs,” said Tom Shottes, Head of Osram

    Digital Systems, Americas Region. “Osram’s new OPTOTRONIC?

    Programmable [url=http://www.emergencyleddriver.com/emergency-led-

    driver/ce-emergency-led-driver/]CE Emergency LED Driver[/url] combines

    the emergency and standard LED drivers into one solution, addressing

    key issues experienced by OEMs. The ability to program and tailor the

    light output in both standard and emergency mode offers additional

    value and flexibility in designing emergency lighting fixtures.”






    The National Fire Protection Association’s code has a minimum

    requirement of one foot candle of light on the ground for at least 90

    minutes to allow people to safely and efficiently exit a building in

    the event of an emergency. A programmable emergency driver solution

    enables OEMs to support customers with tailored and optimized

    [url=http://www.emergencyleddriver.com/emergency-led-driver-

    accessories/]emergency led driver accessories[/url], irrespective of

    the building architecture, space and lighting plans.






    The lamp inrush current on switching LEDs has become an area of

    concern in the lighting industry. ‘Inrush current’ of the LED drivers

    refers to the input current of short duration that flows into the LED

    driver, during the initial start-up, to charge the capacitors on the

    input side. Typically, this is a short duration current, whose

    amplitude is much greater than the operating or steady-state current.

    The inrush current is due to the EMC filter on the input and bulk

    capacitor on the boost circuit this is inherent to the LED technology.






    The figure shows the nature of the inrush current and its peak,

    IMAX. T50 is the time duration in which the inrush current pulse is

    equal to 50% of IMAX. It shows an example of inrush current (IMAX) and

    T50 times for a typical LED driver.






    If there are a number of LED drivers in an LED Luminaire, and if

    there are a number of such LED Luminaires on one circuit, the max peak

    inrush current and it’s duration may be additive. However, it is not

    an exact mathematical calculation; i.e. for “N” drivers connected in

    parallel does not equal exact “N” times the inrush current for one

    driver or N times the T50 time for one driver. It depends on the

    impedance of each driver and the line impedance.






    The line impedance has a significant effect on the peak and

    duration of the inrush current. Transformer type and size, wire size,

    length of runs, and other devices in the circuit path are a few things

    that could lead to high impedance.


    The inrush current and the duration of the LED driver differs from

    manufacturer to manufacturer and from model to model. As this current

    duration is very small, sophisticated instruments with very high

    sampling rates need to be used for exact calculations. The inrush

    current also depends on the exact moment of switching, during the

    alternating cycle.


    For a typical 150W, 0.7A LED driver, Philips Model 9137012116, used

    in various CREE luminaires, the inrush current is stated as 130Amp for

    165 Micro Seconds. It is suggested that up to 7 -10 of these drivers be

    used / per 20A C curve MCB, however it will depend on the individual

    circuit impedance.






    For a typical 220W, 1.05A LED driver, CREE Model LE098X01 used in

    CREE High Output Edge luminaires, the inrush current is stated as 80

    Amp for 1000uS (1mS). It is suggested that up to 6 – 8 of these

    drivers be used /per 20A C curve MCB, however, it will depend on the

    individual circuit impedance.






    A general recommendation is to use C curve circuit breaker with the

    highest current rating that is allowed by the circuit cable size. The

    MCB used needs to have sufficient clearing time for the inrush current

    to clear, without creating the nuisance tripping on power up. This will

    give protection from a short circuit and prevent overheating of wiring

    and connections. MCBs operate by tripping open on detection of an

    overload or short circuit condition. The tripping point relates to the

    magnitude of electrical energy being passed – and this in turn depends

    significantly on both the inrush current peak value and its time

    duration. Accordingly, an MCB could be tripped either by a high peak of

    short duration, or a lower peak of longer duration. In either case, the

    objective is to ensure that the MCB trips before passing excessive

    energy, yet does not trip and cause lighting blackouts, when it does

    not need to.






    Please see below, a typical MCB tripping curve showing the amount

    of time required for a circuit breaker to trip, at a given overcurrent

    level. These curves differ from manufacturer to manufacturer and from

    type to type. Typically, the B type MCB curve has the operating range

    of 3 to 5 In, C type has 5 to 10In and D type has 10-14 In.






    LED drivers (also known as LED power supplies) are similar to

    ballasts for fluorescent lamps or transformers for low-voltage bulbs:

    they provide LEDs with the correct power supply to function and perform

    at their best. If you read our previous article on whether or not your

    LED requires a driver, you’ll already know that all LEDs require a

    driver and that the question you should really be asking is whether or

    not your LED requires an external driver. You’ll also know that there

    are two main kinds of external LED drivers, constant-current and

    constant-voltage, and that the driver you need depends on whether or

    not your LED light source already includes a constant-current driver

    within the light (if so, you would need a constant-voltage driver; if

    not, you need a separate constant-current driver). Now that you’re

    certain your LED light requires an external driver as well as what

    type, it's time to narrow down to the specs you need to consider

    when making a purchasing decision. Here are five factors that will help

    you make the right selection.






    First, consider the voltage requirements of your light. If your

    [url=http://www.emergencyleddriver.com/emergency-led-driver/ul-listed-

    emergency-led-driver/4w-ul-emergnecy-led-driver.html]4W UL emergency

    led driver[/url], use a 12-volt driver; if it uses 24 volts, use a 24-

    volt driver, etc. When choosing a driver for a constant-current LED,

    you must also consider the LED’s current output, which is measured in

    amps or milliamps. In short, make sure your driver will achieve power

    outputs within your light’s specified ranges: consider both voltage

    and current range for a constant-current driver, and simply voltage

    range for a constant-voltage driver.






    Input Voltage / Current






    Next, consider the voltage supply of the location you’ll be using

    your light. Your driver must accept the input voltage of the place you

    ’re using your light so it can properly step it down to the right

    output voltage. Conventional homes supply a standard of 120 volts, and

    most commercial or industrial enterprises supply 277 volts, though it’

    s best to check with an electrician if you’re not sure. Most drivers

    accept a wide range of input voltages. Again, when choosing a driver

    for a constant-current LED, you must consider the LED’s current input

    as well.






    Max Wattage






    Lastly, consider the wattage requirements of your light. Choose a

    driver with a max wattage higher than the wattage of your light. Do not

    pair a driver with a light that exceeds the driver’s maximum wattage

    or with a light that uses less than 50% of the driver’s maximum

    wattage.






    2. Dimming






    Both constant-current and constant-voltage LEDs and drivers can be

    made with a dimming capability, though both must specify that they are

    dimmable in the product datasheet for that assertion to be made. If the

    specs don’t mention dimming at all, it is safe to assume that the

    product is not dimmable, and the same goes for household LEDs with

    internal drivers. Dimmable external drivers often require an external

    dimmer or other dimming control devices specified on the product

    datasheet to work.






    3. Safety






    IP Ratings






    IP ratings tell users the environmental protection that a driver’s

    enclosure provides. The first number specifies protection against solid

    objects, and the second number specifies protection against water

    elements. For example, according to the chart below, a driver with an

    IP67 rating is protected against dust and temporary immersion in water.






    [url=http://www.emergencyleddriver.com/emergency-led-driver/ul-

    listed-emergency-led-driver/]UL Listed Emergency LED Driver,[/url]

    meaning output is considered safe to contact and no major safety

    protection is required at the LED / luminaire level. There is no risk

    of fire or electric shock. These drivers operate using less than 60

    volts (dry) and 30 volts (wet), less than 5 amps, and less than 100

    watts. Although safer, these limitations pose restrictions on the

    number of LEDs a Class 2 driver can operate.






    UL Class 1 drivers have output ranges outside UL Class 2

    designations. UL Class 1 drivers have a high-voltage output and safety

    protection is required within the fixture. Although there are less

    safety precautions, a Class 1 driver can accommodate more LEDs, making

    it more efficient than a Class 2 driver.






    4. Efficiency






    Another key characteristic to choosing LED drivers is efficiency.

    Efficiency, expressed as a percentage, tells you how much of the input

    power the driver can actually use to power the LED. Typical

    efficiencies are between 80-85%, but UL Class 1 drivers that can

    operate more LEDs are usually more efficient.






    5. Power Factor






    The last major characteristic to consider is your driver’s power

    factor. Power factor tells you how much of a real power load the driver

    puts on the electrical network. The range for power factor is between

    -1 and 1. The closer to 1 the power factor is, the more efficient the

    driver is. A conventional standard for power factor is 0.9 or above. If

    power factor isn’t mentioned in a driver specification, it implies

    that the device has a low power factor, below 0.9.






    Still have questions about choosing a driver? Let us know in

    comment or drop us a line on Facebook, Twitter, LinkedIn, or Pinterest!




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