The Reason for Low ESR Elect Caps..

Discussion in 'NZ Computing' started by The GHOST of WOGER., Jul 15, 2004.

  1. Modern MoBo's have some 3 or 4 Adjustable switched mode PSU's

    1. CPU Voltage
    2. Ram "
    3. AGP "


    All these are adjustable, and are High current supplies, look at what a CPU
    uses, many Amps..

    These Switched Mode power Supplies us a Choke and a Electrolytic Cap to
    filter out the Ripple, plus this ripple most be no more that the manufactures
    specs for the CPU etc.

    So they use Low ESR Elect Caps, as these produce the low ripple, and they
    don't get hot like standard Elect caps do..

    That Ripple energy has to be dissipated into the Elect cap, so if they are not
    Low ESR they can get hot and dry out...

    They also produce high ripple noise on the supply voltage..
    The GHOST of WOGER., Jul 15, 2004
    #1
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  2. The GHOST of WOGER.

    ~misfit~ Guest

    The GHOST of WOGER. wrote:
    > Modern MoBo's have some 3 or 4 Adjustable switched mode PSU's
    >
    > 1. CPU Voltage
    > 2. Ram "
    > 3. AGP "
    >
    >
    > All these are adjustable, and are High current supplies, look at what
    > a CPU uses, many Amps..
    >
    > These Switched Mode power Supplies us a Choke and a Electrolytic Cap
    > to filter out the Ripple, plus this ripple most be no more that the
    > manufactures specs for the CPU etc.
    >
    > So they use Low ESR Elect Caps, as these produce the low ripple, and
    > they don't get hot like standard Elect caps do..
    >
    > That Ripple energy has to be dissipated into the Elect cap, so if
    > they are not Low ESR they can get hot and dry out...
    >
    > They also produce high ripple noise on the supply voltage..


    Thank you woger.
    --
    ~misfit~
    ~misfit~, Jul 15, 2004
    #2
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  3. The GHOST of WOGER.

    Ron McNulty Guest

    > That Ripple energy has to be dissipated into the Elect cap,

    Not quite. A perfect electrolytic would be would not dissapate ANY energy.
    High ESR caps dissapate energy because they have significant internal
    resistance which heats because of the high ripple currents involved.

    Regards

    Ron

    "The GHOST of WOGER." <> wrote in message
    news:...
    >
    >
    > Modern MoBo's have some 3 or 4 Adjustable switched mode PSU's
    >
    > 1. CPU Voltage
    > 2. Ram "
    > 3. AGP "
    >
    >
    > All these are adjustable, and are High current supplies, look at what a

    CPU
    > uses, many Amps..
    >
    > These Switched Mode power Supplies us a Choke and a Electrolytic Cap to
    > filter out the Ripple, plus this ripple most be no more that the

    manufactures
    > specs for the CPU etc.
    >
    > So they use Low ESR Elect Caps, as these produce the low ripple, and they
    > don't get hot like standard Elect caps do..
    >
    > That Ripple energy has to be dissipated into the Elect cap, so if they are

    not
    > Low ESR they can get hot and dry out...
    >
    > They also produce high ripple noise on the supply voltage..
    >
    >
    >
    >
    >
    >
    Ron McNulty, Jul 17, 2004
    #3
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