Subject:
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Re: Rechargeable Battery question.
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 30 Jan 2003 22:43:38 GMT
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Original-From:
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physics69 <PHYSICS69@avoidspamINSIGHTBB.COM>
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Viewed:
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1431 times
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> From the How Stuff Works Website.
Question
I have an electric toothbrush. Somehow, placing the plastic-handled
brushing unit into a plastic holder/recharger will recharge the toothbrush
unit. If no metal electrical contact is made, how can this recharge the
toothbrush?
Answer
If you own an electric toothbrush, there's a good chance that it has a
completely sealed toothbrush unit. The toothbrush rests on the charger
without any metal contacts to connect the toothbrush to the base. This has
the great advantage of allowing the toothbrush to be completely sealed so
that water cannot enter through exposed contacts. It also avoids any
problems with water getting into the contacts and shorting out the charger.
This sort of sealed arrangement is called inductive charging.
Essentially, the toothbrush and the base form a two-part transformer, with
the base having one part of the transformer and the toothbrush having the
other. When you slide the toothbrush onto the base, the complete transformer
is created and charge can flow.
The base contains one of the coils and the metal bar. The toothbrush
contains the second coil. When you drop the toothbrush onto the base, you
create the complete transformer!
Inductive Charging
The inductive charger has no direct electrical connection to the EV.
A weatherproof "paddle" provides power transfer to the vehicle through the
generation of a magnetic field. There is no metal-to-metal contact between
charge paddle and the vehicles internal charge port. This paddle is
inserted in the vehicle charging port and provides a safe and easy-to-use
system for EV charging. Charging is terminated when the charging paddle is
removed. The onboard system prevents the vehicle from being driven while
connected and bi-directional communication ensures a safe connection.
Inductive charging systems transfer AC power by magnetically coupling
a primary winding on the supply side to a secondary winding on the vehicle
side. Current flows through the primary inductive coil, or paddle, and the
resulting magnetic flux induces an alternating current through the magnetic
field and across the secondary coil, completing the circuit. The AC current
is converted to DC for storage in the vehicle battery.
Over time, several types of chargers and connectors have evolved and
are referenced as GenI, GenII, and GenIII (TAL) variations. Of these the
GenI and GenII use the large inductive paddle connector (top photo at left)
and the GenIII uses a small inductive paddle (bottom photo at left).
Manufacturers can provide adapters to transition from large to small
connectors such as that shown at right.
Inductive chargers range in price from $1,500 to $3,500 due to
quality, warranty, and various user options such as programming and voice
feedback. Few vehicles have integrated the charging system onboard such
that only a cable and plug is needed (i.e. the GM EV1 onboard 120VAC
extension cord). These UL listed chargers are available from different
manufacturers, in varying sizes, and in wall or pedestal mounts. At most
installations, the public will typically see Delco Magne-Charge units with
the large style paddle shown right.
The GM EV1 was one of the first EVs to utilized the inductive charging
systems and many installations were done utilizing this type of charger.
Today there are several other vehicles such as the Nissan Hypermini EV and
the Toyota RAV4.
----- Original Message -----
From: "Dan Novy" <dan@flashfilmworks.com>
To: <lego-robotics@crynwr.com>
Sent: Thursday, January 30, 2003 4:53 PM
Subject: Rechargeable Battery question.
> Does anyone have any information about the rechargeable battery pacs
> used in certain electric tooth brushes? They recharge in a cradle,
> without any kind of metal contact. Does anyone know how these work,
> where to get parts, or have plans for building your own? I'd like to
> build a robot that can recharge itself just by parking in a "home"
> position. Any info would be appreciated. Thanks
>
> --
> Dan Novy
> Technical Supervisor
> Flash Film Works
>
>
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Message is in Reply To:
 | | Rechargeable Battery question.
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| Does anyone have any information about the rechargeable battery pacs used in certain electric tooth brushes? They recharge in a cradle, without any kind of metal contact. Does anyone know how these work, where to get parts, or have plans for (...) (22 years ago, 30-Jan-03, to lugnet.robotics)
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