integrated circuit geeks: 6V - 50V to 5V 0.2A Converter IC
in [ATVs]
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From: Rowdy on 28 Jul 2010 08:49 I'd like to feed the light coil's output of Jim's GG300 through a full way bridge rectifier and need something that'll convert this rather varying voltage to stable 5V DC. That would then be fed into the Garmin Vista via the USB port, eliminating vibration shut downs and battery drain while riding. Any suggestions what device will turn a rather undefined DC Voltage into 5V ? (200mA max would be sufficient, step up conversion from below 5V input istn't required) TIA Rowdy
From: Rowdy on 28 Jul 2010 08:57 Am 28.07.2010 14:49, schrieb Rowdy: > Any suggestions what device will turn a rather undefined > DC Voltage into 5V ? (200mA max would be sufficient, > step up conversion from below 5V input istn't required) Addendum: I know one could hang a resistor and a 6V Zener diode at the Basis of a medium power transistor and the USB+ at the emitter with another resistor to the input voltage smoothing things out with a capacitor but being lazy and on a tight schedule for spodefest, I though maybe there is an IC / gadget out there, that can do that better with minimal external circuity. Something like an "USB power out from anything in"... Rowdy
From: Tiago on 28 Jul 2010 09:44 On Jul 28, 9:57 am, Rowdy <thy...(a)hottmail.com> wrote: > Am 28.07.2010 14:49, schrieb Rowdy: > > > Any suggestions what device will turn a rather undefined > > DC Voltage into 5V ? (200mA max would be sufficient, > > step up conversion from below 5V input istn't required) > > Addendum: > I know one could hang a resistor and a 6V Zener diode > at the Basis of a medium power transistor and the USB+ > at the emitter with another resistor to the input voltage > smoothing things out with a capacitor but being lazy > and on a tight schedule for spodefest, I though maybe > there is an IC / gadget out there, that can do that better > with minimal external circuity. > Something like an "USB power out from anything in"... > > Rowdy you are some kind of psychic? I was researching this subject right now... found some promising ways: http://www.instructables.com/id/USB-power-plug-in-2010-Prius-III/ http://www.instructables.com/id/How-To-Make-Your-Own-USB-Car-Charger-For-Any-iPod-/ http://www.bixnet.com/usbbatterybox.html also, I found this: http://www.cyclenutz.com/products/gps_navigation/gps_accessories/mini_usb_12v_hardwire_cable.html but the fact you're taking it out of a bike that has no charging system/battery and most likely the output is AC... I dunno if these schemas might work for you... --
From: Rowdy on 28 Jul 2010 10:58 Am 28.07.2010 15:44, schrieb Tiago: > you are some kind of psychic? I was researching this subject right > now... found some promising ways: > > http://www.instructables.com/id/USB-power-plug-in-2010-Prius-III/ 12 V input, max. 15 > http://www.instructables.com/id/How-To-Make-Your-Own-USB-Car-Charger-For-Any-iPod-/ ditto. > http://www.bixnet.com/usbbatterybox.html better: "Vehicle Cigarette Lighter Adapter. (12~24v DC) " > also, I found this: > http://www.cyclenutz.com/products/gps_navigation/gps_accessories/mini_usb_12v_hardwire_cable.html 12~24V is good but it's way too bulky for a motorcycle. > > but the fact you're taking it out of a bike that has no charging > system/battery and most likely the output is AC... I dunno if these > schemas might work for you... Exactly. They won't. They rely on a stable, non zero touching input voltage of at least say 10V. Bikes w/o battery have absolutely ugly voltage "regulators". My late WR400F had a device that wold short circuit voltages above app. 22V! E.g. it would cut the rising slope of the AC voltage off when it reached 22V and _keep it short circuited_ till the generator output would cross zero (reverse polarity). The equivalent voltage of the area under that jagged curve would not exceed the area under constant 12~14V a light bulb has to cope with in a vehicle with battery and that is the only thing the bulbs care about. I presume the GG300 has a similar regulator, more precisely bulb saver, hence rectifying and elaborate buffering (capacitor) must be applied to produce USB typical 5V. I'm pretty sure that the Garmin would not work well on a pulsed 5V input whose frequency changed according to engine rpm... Rowdy
From: Volker Bartheld on 28 Jul 2010 11:18
Hi! > I'd like to feed the light coil's output of Jim's GG300 > through a full way bridge rectifier and need something that'll > convert this rather varying voltage to stable 5V DC. > That would then be fed into the Garmin Vista via the USB port, > eliminating vibration shut downs and battery drain while > riding. The USB power connection will be everything but eliminating vibration shutdowns. Rather will it damage the PCB due to vibrations induced by the connecting wire and (rather large and weighty) USB plug and give humidity, dust and other nasties a chance to penetrate into the device. Vol"BTDT"ker -- @: I N F O at B A R T H E L D dot N E T 3W: www.bartheld.net |