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Re: [TCML] the ir2110 mosfet driver chip for sstcs?
There are several additional precautions that have to be adhered to with these
devices...
1. Either the low channel output must be sequenced several times to establish
"boostrap" charge on the upper channel prior to sequencing as a normal
half bridge, or the upper output will not turn fully on. This
can result in
driver and output device failure.
2. An external bootstrap oscillator using a separate simple 555 circuit
will allow operation of driver to extremely high or low duty cycles without
bootstrap charge starvation.
See below link for external bootstrap drive, this is a multiple kilowatt buck
regulator from effectively 0V to 100% DC bus voltage for an induction heater
power control.
http://www.neon-john.net/Induction/Roy/Buck_Converter.htm
This issue was a major difficulty with Marco Denicolai's Thor, DCPS operated
Tesla Coil. The DC power supply was problematic until Marco sequenced the
low level drivers first to establish bootstrap charge, then the HVDCPS
operated with few problems.
http://www.scribd.com/doc/36584405/thesistesla
On Tue, Jun 7, 2011 at 9:43 AM, David Petzer <davepetzer@xxxxxxxxx> wrote:
> Hi Earl,
>
> I have used the IR2110 in an SSTC application with no issues. From my
> understanding the shut down can be explained in two sentences.
>
> 1. When the shut down is logic high outputs are turned off.
> 2. After that logic high is removed the chip outputs are again in phase with the
> inputs starting from the next positive input edge.
>
> So you just keep supplying your input signals and supply a shut down signal when
> you want to shut it down and remove it when you want to start up again.
>
> Hope this answers your question.
>
> I had an interesting experience regarding this shutdown.
>
> Thermal overload triggered the shut down of the IR2110 drivers driving an
> H-Bridge. I turned off the AC power to the rectifier producing DC for the
> H-Bridge, but the rectifier capacitors remained charged at 300V because the
> MOSFET drivers were shut down. So before being able to investigate the shut down
> I had to wait for the thermostat to remove the shut down command and discharge
> the capacitors. 2 anxious minutes of wondering whether it was just a thermal
> overload problem or something more sinister.
>
> Sure enough after the thermostat cooled, the shut down was removed and the
> rectifier capacitors discharged producing a little squirt of corona.
>
> D.
>
>
>
>
>
> ________________________________
> From: earl rhodes <earl_1975@xxxxxxxxxxxxx>
> To: tcbouklist@xxxxxxxxxxxxxxx; tesla@xxxxxxxxxx; uktcb uktcb
> <uktcb@xxxxxxxxxxxxxxxxx>
> Sent: Tue, June 7, 2011 8:33:56 PM
> Subject: [TCML] the ir2110 mosfet driver chip for sstcs?
>
>
> hi guys
> ive come across a driver chip for sstcs the "ir2110"and the rest of that
> particular set of chips ir 2112 ir2113
> i have a few questions concerning thier use in sstc
> the chip sheet says they already have cycle by cycle shutdown protocols so im
> assuming i no longer need the flipflopclock circuit to control my shut down is
> this correct
>
> if this is correct i only need the one chip for it to work
> where my last board had a total of seven chips on it
> there was a 74hc14 a cd4013 a 74hco8 and four tc4420
> that was without having any ocd on the board
> i could get away with only the one and they are cheap from hong kong at around
> 150 each
>
> your input would be totally apreciated
> i have had some succes with my other board having about 5inch disharge but i do
> keep blowing driver chips for no apparent reason
>
> so ive rebuilt a board ready to take the ir 2110 it will be a couple of weks
> before i get them, im totally skint at the moment and then when i do get them
> bought it will take a further two weeks for them to arrive so in the meantime i
> just thought id ask someone else if im correct about this chip
> heres a link to the data sheet
> http://www.irf.com/product-info/datasheets/data/ir2110.pdf
> if im totally off base its not unusual for me so let me have it
> thanks
> earl
>
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--
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA
Sharpe's Axiom of Murphy's Law
"Physics trumps opinion!"
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