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Burst fire control and phase angle contol

Discussion in 'Electronic Basics' started by carl, Jan 20, 2004.

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  1. carl

    carl Guest

    Can anyone explain how to me how burst fire control and phase angle control
    work? or point me in the right direction, the text books i have don't really
    cover these topics bar mentioning them briefly

    thanks
     
  2. Phase angle control varies the effective voltage by connecting the
    load to the line only during some fraction of each half cycle,
    starting at an adjustable point in each half cycle, and ending at the
    next current zero crossing.

    Burst control varies the effective average voltage (over a longer
    time) by connecting the load to an integer number of complete half
    cycles in a burst, and then disconnecting the load from the line for
    some other integer number of full half cycles. Some systems use
    integer full cycles, rather than full half cycles, to prevent any net
    DC in the burst waveform. Burst mode has more low frequency ripple
    than phase control, but makes less radio frequency and harmonic noise,
    because all on switching is done very near the zero voltage points in
    the line voltage wave and all switch off points are at zero current
    points in the load current wave.

    So phase control is better for ripple sensitive loads like stage
    lighting and motors (where higher frequency ripple is worth the RFI
    filtering needed), while burst mode is better for high power heating
    elements that have a long thermal time constant.
     
  3. grahamk

    grahamk Guest

    Have a look at
    http://homepage.ntlworld.com/g.knott/index13.htm
     
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