M
Michael A. Terrell
Guest
amdx wrote:
Off abusing someone who doesn't deserve it.
Off abusing someone who doesn't deserve it.
R
Rheilly Phoull
Guest
On 07/05/13 10:57, Jim Thompson wrote:
with the PWM output ???
U
Uncle Steve
Guest
On Wed, May 08, 2013 at 04:44:25PM +0800, Rheilly Phoull wrote:
circuits like that, but the fact of the matter is I have a couple of
3055s and this project is as much about learning some basics as it is
about charging a battery. For my requirements it is easier to use
what I have on hand than try to select among parts that I don't really
understand. If there were a fundamental reason why the 3055 is bad
for this application I might consider a mosfet, but I don't see why I
should bother.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
I have the app notes for the LM338 and such, which show simple charger
circuits like that, but the fact of the matter is I have a couple of
3055s and this project is as much about learning some basics as it is
about charging a battery. For my requirements it is easier to use
what I have on hand than try to select among parts that I don't really
understand. If there were a fundamental reason why the 3055 is bad
for this application I might consider a mosfet, but I don't see why I
should bother.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
J
Jim Thompson
Guest
On Wed, 08 May 2013 10:36:21 -0400, Uncle Steve <stevet810@gmail.com>
wrote:
point in this thread, which means the base current that must be
supplied is 200mA... not a big deal EXCEPT the driving device will see
considerable dissipation.
You ought to go buy the TO-3 version of the LM317 for the circuit I
suggested and avoid the magic smoke ;-)
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
The 3055 has a minimum beta of 20 at 4 Amps, which you spoke of at one
point in this thread, which means the base current that must be
supplied is 200mA... not a big deal EXCEPT the driving device will see
considerable dissipation.
You ought to go buy the TO-3 version of the LM317 for the circuit I
suggested and avoid the magic smoke ;-)
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
U
Uncle Steve
Guest
On Wed, May 08, 2013 at 02:19:05PM -0700, Jim Thompson wrote:
4004 diode as superfluous and changing the .5 ohm sense resistor to
..1 ohms, I'm seeing 3A output which is pretty much the capacity of the
power supply. The 3055 runs cooler as well; not sure what that means.
Now I have to use an op-amp comparator to measure the current to get
decent resolution.
etc. for that part.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
I'm starting to appreciate these factors. Yet, after removing the
4004 diode as superfluous and changing the .5 ohm sense resistor to
..1 ohms, I'm seeing 3A output which is pretty much the capacity of the
power supply. The 3055 runs cooler as well; not sure what that means.
Now I have to use an op-amp comparator to measure the current to get
decent resolution.
The literature doesn't specify the switching frequency, rise time,
etc. for that part.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
J
Jim Thompson
Guest
On Wed, 08 May 2013 17:55:36 -0400, Uncle Steve <stevet810@gmail.com>
wrote:
_average_ current, as determined by the PWM?
All you need is a low-pass R/C between the micro and the base of Q1
(as noted in the text box on the schematic).
I'll run a simulation of that and repost later (under this same link).
http://www.analog-innovations.com/SED/ChargerForUncleSteve.pdf
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
I'm curious why you need to "switch" it? Isn't your only concern the
_average_ current, as determined by the PWM?
All you need is a low-pass R/C between the micro and the base of Q1
(as noted in the text box on the schematic).
I'll run a simulation of that and repost later (under this same link).
http://www.analog-innovations.com/SED/ChargerForUncleSteve.pdf
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
J
Jim Thompson
Guest
On Wed, 08 May 2013 15:56:44 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
kludge, it's calculable from the voltage at the emitter of Q1.
(If you want it to be super precise, just add an OpAmp between your
micro and Q1.)
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
And you don't need to measure the current via a high-side OpAmp
kludge, it's calculable from the voltage at the emitter of Q1.
(If you want it to be super precise, just add an OpAmp between your
micro and Q1.)
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
J
Jim Thompson
Guest
On Wed, 08 May 2013 16:01:24 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
http://www.analog-innovations.com/SED/ChargerForUncleSteve.pdf
Non-linearity at low end is due to bias current from LM317 adjust pin.
Scaling both R2 and R3, proportionately to lower values, will lower
that break point.
Diode is necessary as a safety in the case where battery is connected,
but 18V supply is set to zero. Diode can be moved in front of LM317
if desired.
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:
Reposted with those features added...
http://www.analog-innovations.com/SED/ChargerForUncleSteve.pdf
Non-linearity at low end is due to bias current from LM317 adjust pin.
Scaling both R2 and R3, proportionately to lower values, will lower
that break point.
Diode is necessary as a safety in the case where battery is connected,
but 18V supply is set to zero. Diode can be moved in front of LM317
if desired.
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
U
Uncle Steve
Guest
On Wed, May 08, 2013 at 03:56:44PM -0700, Jim Thompson wrote:
what I need. It's an interesting idea to use PWM to control a voltage
regulator, but it's a completely different approach from what I
intended to build. Perhaps it will be worthwhile to refactor your
design and substitute a LM338, which has the requisite capacity. For
now I think I will fool around with the existing arrangement.
Even at 3A output, the 3055 doesn't appear to be saturated as Vce is
only .9V. I picked up a couple of BC517 which have a beta of 30000
and 1A current capacity. Perhaps that will be more effective than the
BC557 in the pseudo-Sziklai arrangement.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
You're probably correct, except the rating of the LM317 is half of
what I need. It's an interesting idea to use PWM to control a voltage
regulator, but it's a completely different approach from what I
intended to build. Perhaps it will be worthwhile to refactor your
design and substitute a LM338, which has the requisite capacity. For
now I think I will fool around with the existing arrangement.
Even at 3A output, the 3055 doesn't appear to be saturated as Vce is
only .9V. I picked up a couple of BC517 which have a beta of 30000
and 1A current capacity. Perhaps that will be more effective than the
BC557 in the pseudo-Sziklai arrangement.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
E
ehsjr
Guest
On 5/8/2013 9:49 PM, Uncle Steve wrote:
It is easy to add a pass element to get higher current later on.
Here's an example diagram to give you an idea how it's done:
MJ2955
Vin ---+----> ------------------+-----------> Vout
| e\ /c |
[3R] --- |
| | ----- |
+------+---Vin|LM317|Vout---+-------+
| ----- | |
| Adj [240R] |
| | | |
| +----------+ |
| | |
[.22uF] / [.1uF]
| \ |
| 5K /<---+ |
| \ | |
| / | |
| | | |
Gnd ----------+---------+----+-------------+
Current drawn from the 317 causes a voltage drop across the
3 ohm resistor. When that voltage drop is below about .6 volts,
the 2955 conducts no e-c current. When the voltage drop rises
to about .6 volts the 2955 begins to conduct e-c current. The
more current drawn by the load, the greater the e-c current.
The e-c current passes around (not through) the 317 so the 2955
is called a pass element or pass transistor.
You can also do it with your 3055, but you need an inverting
stage to its base. See "High Current Adjustable Regulator"
diagram in the datasheet for the 317 for an example of using
an NPN pass element. They use 3 195's in that diagram, but
you need only the single 3055.
expending a lot of effort and have a lot of interest in this, which
is all to the good. But I also see that you are speeding by some
points where you could benefit by working to understand them,
rather than passing them by - which is what prompted me to reply.
part of my reply suggests how you can do it with parts on
hand, then later on add a pass element, or, as you mention,
substitute a 338.
it does, or why the previous attempts didn't. It is
my impression that you are leap frogging some of the
basics. Sometimes throwing bigger/better/stronger parts
at a problem is not in your best interests.
Ed
I would urge you to follow JT's advice. Build his circuit.
It is easy to add a pass element to get higher current later on.
Here's an example diagram to give you an idea how it's done:
MJ2955
Vin ---+----> ------------------+-----------> Vout
| e\ /c |
[3R] --- |
| | ----- |
+------+---Vin|LM317|Vout---+-------+
| ----- | |
| Adj [240R] |
| | | |
| +----------+ |
| | |
[.22uF] / [.1uF]
| \ |
| 5K /<---+ |
| \ | |
| / | |
| | | |
Gnd ----------+---------+----+-------------+
Current drawn from the 317 causes a voltage drop across the
3 ohm resistor. When that voltage drop is below about .6 volts,
the 2955 conducts no e-c current. When the voltage drop rises
to about .6 volts the 2955 begins to conduct e-c current. The
more current drawn by the load, the greater the e-c current.
The e-c current passes around (not through) the 317 so the 2955
is called a pass element or pass transistor.
You can also do it with your 3055, but you need an inverting
stage to its base. See "High Current Adjustable Regulator"
diagram in the datasheet for the 317 for an example of using
an NPN pass element. They use 3 195's in that diagram, but
you need only the single 3055.
In reading your various posts it seems clear to me that you are
expending a lot of effort and have a lot of interest in this, which
is all to the good. But I also see that you are speeding by some
points where you could benefit by working to understand them,
rather than passing them by - which is what prompted me to reply.
No perhaps about it, it is definitely worthwhile. The earlier
part of my reply suggests how you can do it with parts on
hand, then later on add a pass element, or, as you mention,
substitute a 338.
Well, you may get it to work, but you won't learn why
it does, or why the previous attempts didn't. It is
my impression that you are leap frogging some of the
basics. Sometimes throwing bigger/better/stronger parts
at a problem is not in your best interests.
Ed
U
Uncle Steve
Guest
On Fri, May 10, 2013 at 01:27:21PM -0400, ehsjr wrote:
after I replied.
many points, here and in the various bits of literature I've read, to
study in any reasonable length of time.
affect the whole thing. I think I am at the stage where it is
becoming practical to do that sort of experimentation.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
Actually, I recalled seeing this circuit in the app notes, but only
after I replied.
That's the one.
That's the understatement of the week. The problem is there are too
many points, here and in the various bits of literature I've read, to
study in any reasonable length of time.
I'm more interested in using the different parts to see how they
affect the whole thing. I think I am at the stage where it is
becoming practical to do that sort of experimentation.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
J
Jim Thompson
Guest
On Mon, 06 May 2013 12:01:44 -0400, Uncle Steve <stevet810@gmail.com>
wrote:
Remembered where I had stashed some ancient data...
http://www.analog-innovations.com/SED/AlternatorRegulatorTC.pdf
These are the TC curves provided to me by GM and Ford back in the day
when I designed alternator regulators.
Your regulator should approximate such a TC if you want to hold a
reasonable charge on your lead-acid battery.
What information do you actually need fed back to your
microcontroller?
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
Remembered where I had stashed some ancient data...
http://www.analog-innovations.com/SED/AlternatorRegulatorTC.pdf
These are the TC curves provided to me by GM and Ford back in the day
when I designed alternator regulators.
Your regulator should approximate such a TC if you want to hold a
reasonable charge on your lead-acid battery.
What information do you actually need fed back to your
microcontroller?
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
U
Uncle Steve
Guest
On Fri, May 10, 2013 at 07:27:39PM -0700, Jim Thompson wrote:
keep the water level above the top of the plates.
voltage set to the float charge level, but I have numbers from 13.1V
to 13.5V for the float from different sources. It may depend a little
on the battery. For EOC float, it may be easier to specify 50-150mA
or so charge current.
temperature. It would be nice to have load voltage and load current
as well, but I could do without if I had to since my NAS is a static
load.
Serial I/O is one pin since as I'm only doing TX. The ATtiny85 I was
trying out has 5 I/O pins if I keep _RESET_, so I'll have to multiplex
all those measurements on one A/D channel, which actually simplifies
the software a lot. Should be doable, assuming I can make the
electronics work properly. I don't know if any extra safety devices
or sensors are recommended, but with three select bits available,
there are options. Sound reasonable?
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
What, no NDA? Holy crap! I don't want to have to install plumbing to
keep the water level above the top of the plates.
I suspect the thing will charge reasonably quickly with a fixed-
voltage set to the float charge level, but I have numbers from 13.1V
to 13.5V for the float from different sources. It may depend a little
on the battery. For EOC float, it may be easier to specify 50-150mA
or so charge current.
Supply voltage, battery voltage, sense resistor voltage, battery
temperature. It would be nice to have load voltage and load current
as well, but I could do without if I had to since my NAS is a static
load.
Serial I/O is one pin since as I'm only doing TX. The ATtiny85 I was
trying out has 5 I/O pins if I keep _RESET_, so I'll have to multiplex
all those measurements on one A/D channel, which actually simplifies
the software a lot. Should be doable, assuming I can make the
electronics work properly. I don't know if any extra safety devices
or sensors are recommended, but with three select bits available,
there are options. Sound reasonable?
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
J
Jim Thompson
Guest
On Fri, 10 May 2013 23:14:42 -0400, Uncle Steve <stevet810@gmail.com>
wrote:
"Jerry" Stenklyft was a nice engineer/friend from Anderson, Indiana,
who, while visiting Motorola, would come over to my house, help me lay
floor tile, then have dinner with us ;-)
He died in 2004 at age 70.
usage.
BTW, the flattening at low and high temperatures is NOT lead-acid
physics, it's to keep from burning out head lights when cold, and to
minimize dimming when hot. A straight curve is quite adequate for
your purposes.
(My ignition system designs work down to 3V cranking voltage ;-)
capability charge.
lead acid battery to a proper level is downright trivial with
stand-alone simple-minded circuitry. How do you plan to measure
battery temperature?
Columbus, OH, who adds any needed digital and bus needs (SPI, I2C,
CAN, etc.) to my analog chips and he also does my layouts. He has a
Master's from Ohio State and is a whiz at Verilog and VHDL. (Let me
know if you have such needs, and I'll provide contact information.)
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
No NDA? You missed the dates. This was 46+ years ago ;-)
"Jerry" Stenklyft was a nice engineer/friend from Anderson, Indiana,
who, while visiting Motorola, would come over to my house, help me lay
floor tile, then have dinner with us ;-)
He died in 2004 at age 70.
That's what following the TC curve does for you... minimizes water
usage.
BTW, the flattening at low and high temperatures is NOT lead-acid
physics, it's to keep from burning out head lights when cold, and to
minimize dimming when hot. A straight curve is quite adequate for
your purposes.
(My ignition system designs work down to 3V cranking voltage ;-)
You're in for a surprise... holding at 13.2V will give you a weenie
capability charge.
I still don't understand what you are trying accomplish. Charging a
lead acid battery to a proper level is downright trivial with
stand-alone simple-minded circuitry. How do you plan to measure
battery temperature?
I don't speak micros... I hire that out. I have a long-time buddy in
Columbus, OH, who adds any needed digital and bus needs (SPI, I2C,
CAN, etc.) to my analog chips and he also does my layouts. He has a
Master's from Ohio State and is a whiz at Verilog and VHDL. (Let me
know if you have such needs, and I'll provide contact information.)
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
U
Uncle Steve
Guest
On Sat, May 11, 2013 at 09:19:40AM -0700, Jim Thompson wrote:
could buy dynamite to remove tree stumps on their property. Kids
these days would find "Rocket Ship Galileo" utterly alien. Building
rocket motors? Radar? Preposterous.
We're all so much safer now that all that icky science and engineering
is restricted to licensed and regulated corporate facilities.
and tended to by ultra-reliable robots at some autonomous cryogenic
facility in the far North.
battery-longevity are gentle charge/discharge curves, minimizing
temperature excursions, and of course keeping them fully charged.
electronics where I want them, I'll run a discharge/charge cycle and
watch what actually occurs. If I start with 15V supply and PWM, the
battery voltage can be set to whatever is appropriate given battery
state-of-charge. I'm ready for surprises.
This is a good first project with the microcontroller precisely
because it is so trivial. I could go out and buy a small UPS for less
than a hundred bucks but where's the fun in that? I'll probably write
it up afterwards, so you'll be able to see what it looks like then.
what I'm doing in so far as programming is concerned. It was
surprisingly easy to do the serial code; the Atmel part is full of
features that make everything super-easy without a lot of external
electronics.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
The lawyers have been busy since that time. 46 years ago farmers
could buy dynamite to remove tree stumps on their property. Kids
these days would find "Rocket Ship Galileo" utterly alien. Building
rocket motors? Radar? Preposterous.
We're all so much safer now that all that icky science and engineering
is restricted to licensed and regulated corporate facilities.
Condolences. I suppose he didn't have his head frozen to be stored
and tended to by ultra-reliable robots at some autonomous cryogenic
facility in the far North.
I should think so. My reading on the matter tells me the key to
battery-longevity are gentle charge/discharge curves, minimizing
temperature excursions, and of course keeping them fully charged.
Heh. That's a lot of amps.
I haven't decided on a charge voltage yet. Once I sort of have the
electronics where I want them, I'll run a discharge/charge cycle and
watch what actually occurs. If I start with 15V supply and PWM, the
battery voltage can be set to whatever is appropriate given battery
state-of-charge. I'm ready for surprises.
I'll tape a thermistor to the case, or maybe I'll use some glue.
This is a good first project with the microcontroller precisely
because it is so trivial. I could go out and buy a small UPS for less
than a hundred bucks but where's the fun in that? I'll probably write
it up afterwards, so you'll be able to see what it looks like then.
I'm just getting started with microcontrollers, but I already know
what I'm doing in so far as programming is concerned. It was
surprisingly easy to do the serial code; the Atmel part is full of
features that make everything super-easy without a lot of external
electronics.
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
J
Jim Thompson
Guest
On Sat, 11 May 2013 13:19:33 -0400, Uncle Steve <stevet810@gmail.com>
wrote:
myself
fudge in the TC curve.
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
Think Detroit, -20°F, parked outside overnight. I've observed 4V
myself
I'd still go a buck regulator (with a limited current capability), and
fudge in the TC curve.
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
U
Uncle Steve
Guest
On Sat, May 11, 2013 at 10:46:47AM -0700, Jim Thompson wrote:
never have imagined that car batteries dropped out that much.
circuit. I suppose a buck regulator is common in these applications.
http://www.atmel.com/Images/doc8088.pdf
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
Oh, you were referring to the battery chemistry hysteresis. I wouldOn Sat, 11 May 2013 13:19:33 -0400, Uncle Steve <stevet810@gmail.com
wrote:
On Sat, May 11, 2013 at 09:19:40AM -0700, Jim Thompson wrote:
On Fri, 10 May 2013 23:14:42 -0400, Uncle Steve <stevet810@gmail.com
wrote:
[snip]
(My ignition system designs work down to 3V cranking voltage ;-)
Heh. That's a lot of amps.
Think Detroit, -20°F, parked outside overnight. I've observed 4V
myself
never have imagined that car batteries dropped out that much.
This Atmel application note describes a development board using such a
circuit. I suppose a buck regulator is common in these applications.
http://www.atmel.com/Images/doc8088.pdf
Regards,
Uncle Steve
--
There should be a special word in the English language to identify
people who create problems and then turn around and offer up their own
tailor-made bogus non-solutions designed to completely avoid the root
causes of the situation under consideration. 'Traitor' might be a
good choice, but lacks the requisite specificity. One of the problems
with contemporary English is it lacks many such words that would
otherwise categorically identify certain kinds of person, place, or
thing -- making it difficult or impossible to think analytically about
such objects. These shortcomings of the English lexicon are
representative of Orwellian linguistics at work in the real world.
J
Jim Thompson
Guest
On Sat, 11 May 2013 14:19:20 -0400, Uncle Steve <stevet810@gmail.com>
wrote:
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
No, no! While cranking a cold engine.On Sat, May 11, 2013 at 10:46:47AM -0700, Jim Thompson wrote:
On Sat, 11 May 2013 13:19:33 -0400, Uncle Steve <stevet810@gmail.com
wrote:
On Sat, May 11, 2013 at 09:19:40AM -0700, Jim Thompson wrote:
On Fri, 10 May 2013 23:14:42 -0400, Uncle Steve <stevet810@gmail.com
wrote:
[snip]
(My ignition system designs work down to 3V cranking voltage ;-)
Heh. That's a lot of amps.
Think Detroit, -20°F, parked outside overnight. I've observed 4V
myself
Yep. Just replace the output bank of capacitors with your battery.
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice
480)460-2350 Fax: Available upon request | Brass Rat || E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.