Re: Full Bridge IR 2153 Configuration

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "K. C. Herrick by way of Terry Fritz <twftesla-at-qwest-dot-net>" <kchdlh-at-juno-dot-com>

David (& all)-

I had 8, IR2110s arrayed on p.c. boards surrounding the low end of the
12" x 35" secondary--about 3" below the lower end of the secondary.  The
2110s were just "out in the air", not shielded.  I had tried lots of
bypassing, here & there, with no improvement.  Things greatly improved
when I got rid of the 2110s and substituted the bipolar-transistor
circuits.

But I don't know for sure whether it was purely due to the secondary's
e.m.f. or perhaps due instead, or in part, to some spurious oscillations
that I may have been suffering from during the course of my perfecting
(if I may use that word in this context) my design.  I did not keep any
records and even if I had tried to do so, it likely wouldn't have meant
much since I was never sure as to where exactly the problem was coming
from.

Maybe those improvements you cite will do the trick, but I'd think you
might want to hay-wire one or more of the ICs first just to make (almost)
sure.

Regards,

Ken Herrick

On Fri, 06 Dec 2002 21:15:17 -0700 "Tesla list" <tesla-at-pupman-dot-com>
writes:
 > Original poster: "David Sharpe by way of Terry Fritz
 > <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>
 >
 > Hi Ken,
 > Several questions:
 >
 > 1.  How close was driver to TC resonator?
 > 2.  Was the driver in a metallic enclosure or "open air"?
 > 3.  Appropriate bypassing / MOV protection on "DC rails"?
 >
 > This chip is designed for fluorescent lamp ballasts, which aren't
 > exactly quiet (EMI/RFI wise), especially when striking/starting
 > lamps.  The chips I'm looking to use (IR2153D, IR21531D)
 > are only 2-3 years old, and have "ESD and EMI/RFI hardening
 > improvements" over original IR2155 (paraphrasing IR's press
 > release).  So must have been field experiences like you
 > mentioned to require a redesign (read "new and improved")
 > chip.  Not doubting there may be diffculties / sensitivities with
 > this and thanks for feedback.
 >
 > Regards
 > Dave Sharpe, TCBOR
 > Chesterfield, VA. USA
 >
 > Tesla list wrote:
 >
 >  > Original poster: "K. C. Herrick by way of Terry Fritz
 > <twftesla-at-qwest-dot-net>" <kchdlh-at-juno-dot-com>
 >  >
 >  > A word of caution regarding the high/low-side IR drivers:  I had
 > tried to
 >  > use that type of IR IC early-on, in my s.s. coil, and seem to
 > have found
 >  > that the high e.m. field of the secondary interfered with the
 > driver's
 >  > internal high-impedance high-side coupler circuit--to the extent
 > that I
 >  > had to abandon the effort and go to a home-made
 > bipolar-transistor
 >  > h-bridge driver + gate-transformers.  Those interested in those
 > ICs might
 >  > want to make sure they will withstand the ambient field before
 > committing
 >  > to pc boards...
 >  >
 >  > Ken Herrick
 >  >
 >  > On Thu, 05 Dec 2002 22:31:22 -0700 "Tesla list"
 > <tesla-at-pupman-dot-com>
 >  > writes:
 >  >  > Original poster: "David Sharpe by way of Terry Fritz
 >  >  > <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>
 >  >  >
 >  >  > IR supplied info today for full bridge driver using two (2)
 >  >  > IR2153's
 >  >  > A series resistor is wired from Rt terminal of first (master)
 > chip
 >  >  > and
 >  >  >
 >  >  > wired to Ct of second (slave) chip.  A pull up resistor is
 >  >  > installed
 >  >  > between Ct of Vcc of second chip to allow minimum voltage
 >  >  > on Ct to agree with following relationship:
 >  >  >
 >  >  > 1/6Vcc (shutdown) < Ct <= 1/3Vcc
 >  >  >
 >  >  > According to Applications Engineering, both chips will now be
 >  >  > running
 >  >  > in anti-phase relationship to one another (i.e. a full bridge
 >  >  > driver).
 >  >  >
 >  >  > When I build PCB will design board to support master or slave
 >  >  > configuration (maybe setup via a dip switch or optocoupled
 >  >  > [isolated] mode).
 >  >  >
 >  >  > To support a same phase configuration (as self balancing
 > multilevel
 >  >  > converter), an inverter must be used between Rt of master and
 > Ct
 >  >  > of slave chip; a high speed optocoupler will nicely perform
 > this
 >  >  > isolated
 >  >  > signal inversion function, and allow galvanic isolation
 > between
 >  >  > stages.
 >  >  >
 >  >  > Now its time to start laying out and assembling some PCB's...
 >  >  > Still consider a full bridge converter capable of ~2kW for
 > silicon
 >  >  > cost of < $20.  Incredible...   :^D
 >  >  >
 >  >  > Regards
 >  >  > Dave Sharpe, TCBOR
 >  >  > Chesterfield, VA. USA
 >  >  >
 >  >  >
 >  >  >
 >  >  >
 >
 >
 >
 >