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Super Capacitor — Parallax Forums

Super Capacitor

ArchiverArchiver Posts: 46,084
edited 2001-12-27 17:16 in General Discussion
Hi,
What is super capacitor ?

Thank You
Mohamed Refky



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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2001-12-25 17:03
    Super Capacitors are energy storage devices.
    its capacitance is specified in Farads and is typically used to
    maintain electronic circuits energized for long periods of time.
    They are low voltage devices in the range of 5 volts.
    The major problem is the large internal resistance (Equivalent Series
    Resistance, ESR for short) that makes those devices a low current
    device (micro amps).
    the approximate discharge time of capacitor (Super Caps included) is:

    t=C*I/Vc

    where t in seconds, C in Farads, I in amperes, Vc is the fully
    charges voltage.
    The equivalent capacitor voltage (Vc) is a open load voltage source
    (Vo) in series with a internal resistance Resr
    (Thevenin's equivalent circuit)

    Resr
    |----/\/\/\----
    [noparse][[/noparse]O] Vo Vc
    |

    --- In basicstamps@y..., "Mohamed REFKY" <refky@h...> wrote:
    > Hi,
    > What is super capacitor ?
    >
    > Thank You
    > Mohamed Refky
    >
    >
    >
    > _________________________________________________________________
    > Send and receive Hotmail on your mobile device:
    http://mobile.msn.com
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-25 21:01
    A low-voltage, high-capacitance capacitor used as a backup battery on some
    memory and clock-calendar circuits, etc... Also used in some of the BEAM
    robot stuff I believe.
    Original Message

    > What is super capacitor ?
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-25 23:07
    Don't you mean t=CV/I ?
    because,
    Q=C*V=I*t where Q is total charge in Coulombs.

    Regards,
    Ray McArthur
    Original Message
    From: acatano2002 <acatano2002@y...>
    > the approximate discharge time of capacitor (Super Caps included) is:
    >
    > t=C*I/Vc
    >
    > where t in seconds, C in Farads, I in amperes, Vc is the fully
    > charges voltage.
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-25 23:12
    Why is it you folks are never around to answer questions? It seems to me all
    you do is lie in wait to correct people's mistakes?
    Original Message


    > Don't you mean t=CV/I ?
    > because,
    > Q=C*V=I*t where Q is total charge in Coulombs.

    > > the approximate discharge time of capacitor (Super Caps included) is:
    > >
    > > t=C*I/Vc
    > >
    > > where t in seconds, C in Farads, I in amperes, Vc is the fully
    > > charges voltage.
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-26 02:37
    I stand corrected

    --- In basicstamps@y..., "Ray McArthur" <rjmca@u...> wrote:
    > Don't you mean t=CV/I ?
    > because,
    > Q=C*V=I*t where Q is total charge in Coulombs.
    >
    > Regards,
    > Ray McArthur
    >
    >
    Original Message
    > From: acatano2002 <acatano2002@y...>
    > > the approximate discharge time of capacitor (Super Caps included)
    is:
    > >
    > > t=C*I/Vc
    > >
    > > where t in seconds, C in Farads, I in amperes, Vc is the fully
    > > charges voltage.
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-26 04:07
    We accept your point of view. However I understand that the reason
    for these groups is:
    "share knowledge between beginners and experts"
    --- In basicstamps@y..., Rodent <daweasel@s...> wrote:
    > Why is it you folks are never around to answer questions? It seems
    to me all
    > you do is lie in wait to correct people's mistakes?
    >
    >
    Original Message
    >
    >
    > > Don't you mean t=CV/I ?
    > > because,
    > > Q=C*V=I*t where Q is total charge in Coulombs.
    >
    > > > the approximate discharge time of capacitor (Super Caps
    included) is:
    > > >
    > > > t=C*I/Vc
    > > >
    > > > where t in seconds, C in Farads, I in amperes, Vc is the fully
    > > > charges voltage.
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-26 04:25
    Thats fine if these folks contribute on a regular basis. However, they only
    seem to pop up when someone makes an error, and then only to show off what
    skills they have. Trust me, real experts don't do this.
    Original Message

    > We accept your point of view. However I understand that the reason
    > for these groups is:
    > "share knowledge between beginners and experts"

    > > Why is it you folks are never around to answer questions? It seems
    > to me all
    > > you do is lie in wait to correct people's mistakes?
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-26 05:11
    If somebody checks their email AFTER an answer has already been given,
    what's the point of providing another answer? There is no harm in lurking,
    and if somebody offers an incorrect mathematical formula, it's far better
    for the lurker to jump in and correct it than to let it slide. Not everybody
    has time to answer every question that a large percentage of us has the
    capability of answering. Thank goodness, too--I personally find it annoying
    to get a dozen identical answers to a simple question. I end up deleting so
    many unread messages that I often miss these tangential threads...

    Cliff

    Original Message
    From: "Rodent" <daweasel@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: Tuesday, December 25, 2001 8:25 PM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Super Capacitor


    Thats fine if these folks contribute on a regular basis. However, they only
    seem to pop up when someone makes an error, and then only to show off what
    skills they have. Trust me, real experts don't do this.
    Original Message

    > We accept your point of view. However I understand that the reason
    > for these groups is:
    > "share knowledge between beginners and experts"

    > > Why is it you folks are never around to answer questions? It seems
    > to me all
    > > you do is lie in wait to correct people's mistakes?




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  • ArchiverArchiver Posts: 46,084
    edited 2001-12-26 05:39
    A wise person will accept new input, evaluate the comments, act upon them
    and be thankful that some one cared enough to point out errant thinking or
    give another point of view for consideration. Welcome the new input as help
    and not a criticism.
    Original Message
    From: "Rodent" <daweasel@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: Tuesday, December 25, 2001 8:25 PM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Super Capacitor


    > Thats fine if these folks contribute on a regular basis. However, they
    only
    > seem to pop up when someone makes an error, and then only to show off what
    > skills they have. Trust me, real experts don't do this.
    >
    >
    Original Message
    >
    > > We accept your point of view. However I understand that the reason
    > > for these groups is:
    > > "share knowledge between beginners and experts"
    >
    > > > Why is it you folks are never around to answer questions? It seems
    > > to me all
    > > > you do is lie in wait to correct people's mistakes?
    >
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-26 08:17
    Cliff
    I agree 100%, especially if one is in another time zone.
    Regards
    ECO
    Original Message
    From: "Cliff Griffin" <cliff@g...>
    To: <basicstamps@yahoogroups.com>
    Sent: Wednesday, December 26, 2001 6:11 AM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Super Capacitor


    >
    > If somebody checks their email AFTER an answer has already been given,
    > what's the point of providing another answer?
  • ArchiverArchiver Posts: 46,084
    edited 2001-12-27 17:16
    So,is it the memory back-up capacitor?


    >From: "acatano2002" <acatano2002@y...>
    >Reply-To: basicstamps@yahoogroups.com
    >To: basicstamps@yahoogroups.com
    >Subject: [noparse][[/noparse]basicstamps] Re: Super Capacitor
    >Date: Tue, 25 Dec 2001 17:03:10 -0000
    >
    >Super Capacitors are energy storage devices.
    >its capacitance is specified in Farads and is typically used to
    >maintain electronic circuits energized for long periods of time.
    >They are low voltage devices in the range of 5 volts.
    >The major problem is the large internal resistance (Equivalent Series
    >Resistance, ESR for short) that makes those devices a low current
    >device (micro amps).
    >the approximate discharge time of capacitor (Super Caps included) is:
    >
    > t=C*I/Vc
    >
    >where t in seconds, C in Farads, I in amperes, Vc is the fully
    >charges voltage.
    >The equivalent capacitor voltage (Vc) is a open load voltage source
    >(Vo) in series with a internal resistance Resr
    >(Thevenin's equivalent circuit)
    >
    > Resr
    > |----/\/\/\----
    > [noparse][[/noparse]O] Vo Vc
    > |
    >
    >
    >
    >--- In basicstamps@y..., "Mohamed REFKY" <refky@h...> wrote:
    > > Hi,
    > > What is super capacitor ?
    > >
    > > Thank You
    > > Mohamed Refky
    > >
    > >
    > >
    > > _________________________________________________________________
    > > Send and receive Hotmail on your mobile device:
    >http://mobile.msn.com
    >
    >
    >To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    >from the same email address that you subscribed. Text in the Subject and
    >Body of the message will be ignored.
    >
    >
    >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >




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