The Electric Triac from Green Vehicles
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Looking for some electric but are frustrated that a motorcycle doesn’t have enough while a care has too many wheels? Probably not, that’s just silly, let’s be serious. The TRIAC, from Green Vehicles, is a zero emission* three wheeled highway capable plug-in electric that deserves some serious attention. The thought of a three wheeled vehicle reminds me of one of my first set of wheels, but the TRIAC is far from a toy going 100 miles on a single charge and capable of traveling 80 MPH. Charging takes about 6 hours and the 100 mile range can be upped to 125 with an optional capacity boost pack. It has a low center of gravity and employs a reinforced steel cage to protect the occupants inside it’s alleged spacious and comfortable cabin. They are taking pre-orders for a July 2008 delivery and test drives will be available by mid-July.
* 0 emission directly, indirectly, however all things that we plug into the wall require electricity that comes from power plants which in the US produce a lot of green house gases.
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12v to 18v DC Converter by LT1170
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The supply works by shorting the inductor across the 12 volts through the regulator. This stores energy in the inductor. When the internal switch in the LT1170 goes off, the inductor is placed in series with the 12 volts, adding to it. This voltage pulse is stored in the output capacitor and smooths the output. The diode is used to keep the output capacitor from discharging during switching.
It contains a 100 khz current based oscilator whose output is controled by feedback provided by R1 and R2. These make a voltage divider such that at the wanted output voltage there is 1.24V at the junction of these two resistors. They carry only 1 ma of current and are there to provide a reference voltage to an op amp in the IC. As you draw more current from the output the total voltage would drop as would the 1.24v reference signal. The op amp feeds this to the oscillator telling it to provide more current to fill the demand. This brings the voltage up to 1.24v reference or 18 output. Reduce the load and the opposite happens.
Part list:
L1 inductor 100 µH Hurricane HL-AK210Q
Coiltronics PL52E-100-5000 must handle at least 3 amps
C1 capacitor 56 µf
33 µf Nichicon x1 UPL1E330MAH 25V ESR=.800 Irms=.155A
C2 capacitor 330 µf
390 µf Nichicon x2 UPL1V391MPH 35V ESR=.028 Irms=2.440A
Cc capacitor 1 µf
LT IC switching regulator Linear Technologies LT1170CT data sheet
D1 Schottky 5A Motorola 1N5824
1N5821 Any high speed diode that can handle the power would do. Schottky type is best but not absolutely required.
R1 resistor 16.7k; 1% R1 and R2 set the output voltage; The ratio of R1 to R2 should be 13.5 to 1.
R2 resistor 1.24k; 1%
Rc resistor 1k
Read More Source:
http://obs.nineplanets.org/meade/1812/1812.html
Thank you.
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The first example uses the standard op-amp oscillator circuit to generate a triangular waveform which is level-shifted and fed to a comparator (e.g. LM339) to give the PWM waveform. Most people will want to use two comparators rather than one op-amp and one comparator so that is what we show here.
Read More Source:
http://www.4qdtec.com/pwmmod.html
Thank you.
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Microstepper Motor Controller - [Download Project] [View Abstract]
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This circuit will allow you to control the speed of an AC motor, for example an electric drill. The way that this circuit works is as follows. The bridge rectifier produces dc voltage from the 120vac line. A portion on this current passes through the 10K ohm pot. The circuit comprised of the 10k pot, the two 100 ohm resistors and the 50uf capacitors delivers gate drive of the SCR. The diode D1 protects the circuit from reverse voltage spikes. The ratings of the bridge rectifier and the SCR should be 25 amps and PIV 600 volts. The diode D1 should be rated for 2 amps with PIV of 600 volts. The circuit can handle a load up to 10 amps. The SCR should be very well heat sinked.
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Read More Source:
http://home.maine.rr.com/randylinscott/aug99.htm
Thank you.