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47320Re: [beam] Re: Bolt H-bridge, CD H-bridge, EmiterFollower H-bridge

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  • DrewB
    Feb 1, 2005
      Thanks,

      --- wilf_nv <wrigter@...> wrote:

      >
      > Eric the librarian, has done a thorough analysis of
      > the Bolt bridge
      > here:
      >
      >
      http://www.solarbotics.net/library/circuits/driver_4varH_test.html
      >
      > The Bolt bridge is not smokeless (selfdestructs if
      > the inputs are
      > floated) and while simple, is not particularly
      > efficient especially
      > at low currents. Requires full rail to rail input
      > drive or else.
      >
      > The emitter follower bridge is the simplest discrete
      > component bridge
      > requiring no resistors at all. It has the highest
      > current efficiency
      > with all current passing through the load. It does
      > have a
      > significant voltage drop that reduces efficiency
      > with low voltage
      > supplies. There are ways to improve this voltage
      > drop by overdriving
      > the base inputs beyond the rails.
      >
      > The current dump (CD) bridge combines the 240
      > motordriver with the
      > emitter follower bridge. The 240 supplies low
      > current with low
      > voltage drop while the emitter follower transistors
      > kick in under
      > high load conditions.
      >
      > wilf
      >
      >
      > --- In beam@yahoogroups.com, DrewB
      > <psycholist2000@y...> wrote:
      > > As time permits, can I get a comparison between
      > The
      > > "Bolt Smokeless H-Bridge," The "CD H-Bridge," and
      > the
      > > "Emiter Follower H-Bridge"?
      > >
      > >
      >
      >
      >
      >




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