Charging and discharging capacitors
Charging and discharging capacitors
(OP)
I am looking for an intergrated circuit that would charge a bank of 4 capacitors in parallel and then discharge them in series. I have a 1 volt dc source.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Charging and discharging capacitors
|
Charging and discharging capacitorsCharging and discharging capacitors(OP)
I am looking for an intergrated circuit that would charge a bank of 4 capacitors in parallel and then discharge them in series. I have a 1 volt dc source.
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: Charging and discharging capacitors
You need to create a higher voltage from 1 V? There is a possibility that a fly-back switcher could do the job.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Charging and discharging capacitors
RE: Charging and discharging capacitors
RE: Charging and discharging capacitors
Never heard about them before. But, if you look at the characteristics, you will have a hard time making it work if 1.0 V is all you have available.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Charging and discharging capacitors
The 0.2V or 0.4 V threshold devices are probably more practical.
TTFN
RE: Charging and discharging capacitors
Can't remember the part number, but if it still exists, it should be on their website.
RE: Charging and discharging capacitors
What level of current are you dealing with? Size of capacitor?
There are plenty of circuits that can boost from 1 volt to several volts, but they generally use discrete parts.
If you really need to charge 4 caps in parallel and then connect them in series, I suggest using a low power boost circuit to generate enough voltage to power some MOS devices to do the switching. That way, you can tailor the devices to the power level you require.
RE: Charging and discharging capacitors
RE: Charging and discharging capacitors
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Charging and discharging capacitors
h
2x appears to be the limit of the Maxim parts
TTFN
RE: Charging and discharging capacitors
----------------------------------
Sometimes I only open my mouth to swap feet...
RE: Charging and discharging capacitors
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Charging and discharging capacitors
RE: Charging and discharging capacitors
----------------------------------
Sometimes I only open my mouth to swap feet...
RE: Charging and discharging capacitors
http://www.micrel.com/_PDF/mic2571.pdf
http://www.micrel.com/_PDF/mic2570.pdf
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Charging and discharging capacitors
EDN designs ideas for May 25, 2006 pp 91-92 has a DC-to-DC converter that can operate from voltages as low as 300mV to 1.6 volts. With 475mV input it can suppy 2ma at 5 volts.
RE: Charging and discharging capacitors
That is 1µA at 1V.
The best option is to give up now, if possible.
1µA operating current is a big thing to ask and would require specialist development if it is actually possible.
RE: Charging and discharging capacitors
And, besides, self-discharge of a rechargable battry is around this current - often higher. Charging time will be close to eternity.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Charging and discharging capacitors
Even powering a DC-DC from 300mv is pretty exteme.
RE: Charging and discharging capacitors
The ad said it will run on 0.66V and boost up to a range of 2.5 - 5.0 Volt.
Designed for single cell supply.
I will try to get the part #
RE: Charging and discharging capacitors
It operates down to 0.85V, boosting to 3.3.