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Science Forum Index » Electronics - Design Forum » Inductive coupling help reqd..
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| TT_Man |
 Posted: Fri Apr 25, 2008 2:23 pm |
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Guest
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I have a product that I want to upgrade to inductive coupling for battery
charging. The base could fit inside the source coil, but the coil would need
to have an internal diameter of about 3" This could completely enclose the
receiver coil in the base of the unit. E.G two concentric coils.. Charge
current needs to be in the order of 100mA @ 10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Most of my searching reveals high frequency type systems. Is this mandatory? |
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| Baron |
| Posted: Fri Apr 25, 2008 2:49 pm |
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Guest
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TT_Man wrote:
Quote: I have a product that I want to upgrade to inductive coupling for
battery charging. The base could fit inside the source coil, but the
coil would need to have an internal diameter of about 3" This could
completely enclose the receiver coil in the base of the unit. E.G two
concentric coils.. Charge current needs to be in the order of 100mA @
10V. Is this feasible using a 230V mans coil ? Efficiency is not an
issue. Most of my searching reveals high frequency type systems. Is
this mandatory?
There are one or two electric toothbrushes that use this trick to charge
the battery in the brush from 240V 50Hz.
--
Best Regards:
Baron. |
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| John Tserkezis |
| Posted: Fri Apr 25, 2008 4:26 pm |
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Guest
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TT_Man wrote:
Quote: I have a product that I want to upgrade to inductive coupling for battery
charging. The base could fit inside the source coil, but the coil would need
to have an internal diameter of about 3" This could completely enclose the
receiver coil in the base of the unit. E.G two concentric coils.. Charge
current needs to be in the order of 100mA @ 10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Efficiency IS an issue. There are more ramifications that a few cents per
year extra in power consumption. Melting plastics for one thing (albeit for
higher power devices).
Quote: Most of my searching reveals high frequency type systems. Is this mandatory?
Makes for smaller coils for one thing. Depends on how "portable" you want
to make the device.
Again, don't disregard little things like this. I replaced my cordless
drill battery with an SLA type I had on hand, because it was quick and easy
and I couldn't be bothered going out to buy the proper one the next day.
Nearly 6 pounds in the battery alone. Great capacity, but ruins the balance
and more importantly, the aesthetics of the tool.
--
Linux Registered User # 302622
<http://counter.li.org> |
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| Joerg |
| Posted: Fri Apr 25, 2008 5:52 pm |
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Guest
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TT_Man wrote:
Quote: I have a product that I want to upgrade to inductive coupling for battery
charging. The base could fit inside the source coil, but the coil would need
to have an internal diameter of about 3" This could completely enclose the
receiver coil in the base of the unit. E.G two concentric coils.. Charge
current needs to be in the order of 100mA @ 10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Most of my searching reveals high frequency type systems. Is this mandatory?
Pretty much, since 50/60Hz doesn't couple too well. Mainly because you'd
need oodles of turns to get up to the required inductance and also
because it's a fixed frequency.
The trick is to make the setup series resonant. Typical frequencies at
this power level are in the 50-100kHz range.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM. |
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| TT_Man |
| Posted: Sun Apr 27, 2008 2:35 pm |
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"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:7htQj.496$To6.25@newssvr21.news.prodigy.net...
Quote: TT_Man wrote:
I have a product that I want to upgrade to inductive coupling for battery
charging. The base could fit inside the source coil, but the coil would
need to have an internal diameter of about 3" This could completely
enclose the receiver coil in the base of the unit. E.G two concentric
coils.. Charge current needs to be in the order of 100mA @ 10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Most of my searching reveals high frequency type systems. Is this
mandatory?
Pretty much, since 50/60Hz doesn't couple too well. Mainly because you'd
need oodles of turns to get up to the required inductance and also because
it's a fixed frequency.
The trick is to make the setup series resonant. Typical frequencies at
this power level are in the 50-100kHz range.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
O.K. Does anyone have any pointers for a reference design? My google
searches have come up with very little... |
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| Joerg |
| Posted: Sun Apr 27, 2008 3:40 pm |
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Guest
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TT_Man wrote:
Quote: "Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:7htQj.496$To6.25@newssvr21.news.prodigy.net...
TT_Man wrote:
I have a product that I want to upgrade to inductive coupling for battery
charging. The base could fit inside the source coil, but the coil would
need to have an internal diameter of about 3" This could completely
enclose the receiver coil in the base of the unit. E.G two concentric
coils.. Charge current needs to be in the order of 100mA @ 10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Most of my searching reveals high frequency type systems. Is this
mandatory?
Pretty much, since 50/60Hz doesn't couple too well. Mainly because you'd
need oodles of turns to get up to the required inductance and also because
it's a fixed frequency.
The trick is to make the setup series resonant. Typical frequencies at
this power level are in the 50-100kHz range.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
O.K. Does anyone have any pointers for a reference design? My google
searches have come up with very little...
Haven't seen any on the web and I can't disclose any stuff I did for
clients. Just look for series resonant converters. The trick is to
mitigate the inevitable huge leakage inductance that results from the
coils' poor coupling but you can only do that for one side. That would
usually be the input side.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM. |
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| Harry Dellamano |
| Posted: Sun Apr 27, 2008 4:39 pm |
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Guest
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"TT_Man" <Someone@ntlworld.com> wrote in message
news:vA4Rj.16298$244.3571@newsfe1-win.ntli.net...
Quote:
"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:7htQj.496$To6.25@newssvr21.news.prodigy.net...
TT_Man wrote:
I have a product that I want to upgrade to inductive coupling for
battery charging. The base could fit inside the source coil, but the
coil would need to have an internal diameter of about 3" This could
completely enclose the receiver coil in the base of the unit. E.G two
concentric coils.. Charge current needs to be in the order of 100mA @
10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Most of my searching reveals high frequency type systems. Is this
mandatory?
http://arxiv.org/ftp/physics/papers/0611/0611063.pdf
Enjoy,
Harry |
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| Harry Dellamano |
| Posted: Sun Apr 27, 2008 5:00 pm |
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Guest
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"Harry Dellamano" <harryd@tdsystems.org> wrote in message
news:4814f284$0$12900$4c368faf@roadrunner.com...
Quote:
"TT_Man" <Someone@ntlworld.com> wrote in message
news:vA4Rj.16298$244.3571@newsfe1-win.ntli.net...
"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:7htQj.496$To6.25@newssvr21.news.prodigy.net...
TT_Man wrote:
I have a product that I want to upgrade to inductive coupling for
battery charging. The base could fit inside the source coil, but the
coil would need to have an internal diameter of about 3" This could
completely enclose the receiver coil in the base of the unit. E.G two
concentric coils.. Charge current needs to be in the order of 100mA @
10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Most of my searching reveals high frequency type systems. Is this
mandatory?
http://arxiv.org/ftp/physics/papers/0611/0611063.pdf
Enjoy,
Harry
Oops, try this,
http://etd.lsu.edu/docs/available/etd-04152005-104826/unrestricted/Gaddam_thesis.pdf
Harry |
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| JosephKK |
| Posted: Thu May 01, 2008 8:08 am |
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Guest
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On Sat, 26 Apr 2008 07:26:51 +1000, John Tserkezis
<jt@techniciansyndrome.org.invalid> wrote:
Quote: TT_Man wrote:
I have a product that I want to upgrade to inductive coupling for battery
charging. The base could fit inside the source coil, but the coil would need
to have an internal diameter of about 3" This could completely enclose the
receiver coil in the base of the unit. E.G two concentric coils.. Charge
current needs to be in the order of 100mA @ 10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Efficiency IS an issue. There are more ramifications that a few cents per
year extra in power consumption. Melting plastics for one thing (albeit for
higher power devices).
Most of my searching reveals high frequency type systems. Is this mandatory?
Makes for smaller coils for one thing. Depends on how "portable" you want
to make the device.
Again, don't disregard little things like this. I replaced my cordless
drill battery with an SLA type I had on hand, because it was quick and easy
and I couldn't be bothered going out to buy the proper one the next day.
Nearly 6 pounds in the battery alone. Great capacity, but ruins the balance
and more importantly, the aesthetics of the tool.
I will leave unsaid but hinted at my utterly derogatory assertions
about worrying over the aesthetics of a tool over the function. |
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| Terry Given |
| Posted: Thu May 01, 2008 5:58 pm |
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Guest
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JosephKK wrote:
Quote: On Sat, 26 Apr 2008 07:26:51 +1000, John Tserkezis
jt@techniciansyndrome.org.invalid> wrote:
TT_Man wrote:
I have a product that I want to upgrade to inductive coupling for battery
charging. The base could fit inside the source coil, but the coil would need
to have an internal diameter of about 3" This could completely enclose the
receiver coil in the base of the unit. E.G two concentric coils.. Charge
current needs to be in the order of 100mA @ 10V.
Is this feasible using a 230V mans coil ? Efficiency is not an issue.
Efficiency IS an issue. There are more ramifications that a few cents per
year extra in power consumption. Melting plastics for one thing (albeit for
higher power devices).
Most of my searching reveals high frequency type systems. Is this mandatory?
Makes for smaller coils for one thing. Depends on how "portable" you want
to make the device.
Again, don't disregard little things like this. I replaced my cordless
drill battery with an SLA type I had on hand, because it was quick and easy
and I couldn't be bothered going out to buy the proper one the next day.
Nearly 6 pounds in the battery alone. Great capacity, but ruins the balance
and more importantly, the aesthetics of the tool.
I will leave unsaid but hinted at my utterly derogatory assertions
about worrying over the aesthetics of a tool over the function.
Aesthetics are important too. Alas most "designers" care only about
aesthetics.
I sold my last property to a chippie (builder). He only uses 12V tools.
Initially I scoffed, until I spent an entire day working with my 18V
drill held above my head.
Cheers
Terry |
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