Showing posts with label Inverters. Show all posts
Showing posts with label Inverters. Show all posts
This is a basic circuit of a step up DC-DC converter which the output voltage is more than the
input, the circuit could be used to power a 9v or more devices from a 6v or even a 1.5v battery, charge batteries (3-12v) with 1.5v solar cell...
The circuit uses an oscillator using Schmitt trigger, all types of oscillators works, one transistor (Ex: BD139 or similar), resistors, coil (many different
types of coils work even a small DC motor works! or you can wind 60 turn on ferrite)
R1 and C1 determine the oscillation frequency, different types of coils perform differently at frequencies changes.
I used 5v input and toroid ferrite, the output exceed 60v (no load). The output voltage will drop as the load go higher.
Other types of oscillators can be used:
Other one to use see here: Simple rectangular oscillator
7812 or 7805 regulators can be used to stabilize the output voltage. (remember not to exceed the maximum input voltage)
Thanks
Joule thief is a simple step up converter, that converts DC to DC, for example you can drive a 3.4V Led with single 1.2V battery, even if the battery is almost dead. It extract all the energy stored in batteries.
You need:
- 1Kohm resistor.
- small NPN transistor ( for example 2N3904 ).
- ferrite toroid, (can be found on power supplies, radio), and wire to wrap around the toroid, ( big toroid and more turns = more output power and voltage you get ) the method of wiring is shown under, (if you don't have the toroid try the other methods under).
- and Led or anything you can't drive with one battery like: leds, lighting a neon lamp, charging capacitors with high voltage, charging other batteries Ex: charging 3.6V batteries with 1.2V battery...
you can change the 1.2V battery with 9V to get high voltage output that can drive neon lamps...
you can charge batteries...
A demostration:
A different types of coils can be used
Thanks
This circuit is a rectangular oscillator, that generates a square wave form, the circuit uses NAND logic gates, using CD4011 (contain 4 nand gates), the generated signal can be used as an audio alarm (by connecting a speaker directly to the output), or amplified and used as an inverter...
The enable input should be (+V) so that the circuit oscillates, if it's low, the output will remain at High (+V), If you do not need a controlled input, you can connect the two inputs of the two gates together and remove the connection between the first and the second gate. (like the picture)
This may simplify the wiring.
Caution: the common point of the resistors and the capacitor is not grounded.
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_An inverter is a circuit that converts dc voltage to ac voltage, The circuit uses two power transistors, two power resistors, and the transformer.
Decrease R1 and R2 value to get more power.
_The transistors determine how much power the inverter can supply, and the transformer determines the input and output voltage, also it should handle the needed power, so more power means bigger transformer, The least expensive and the easiest way to get a big transformer is to re-wind an old microwave transformer, they supply at about 1KW.
_You can choose any high power transistor, according to your needed current for exemple 2N3055 2SC5200 2N3773 MJ2955 2sd1047 2SC2922 2SA1943...
_A good 12v battery should be used to supply the wanted power, Remember, when operating at high powers, the circuit draws big amounts of current. so be careful not to let your battery go dead!!!
This image shows some of the caracteristics of the circuit:
Decrease R1 and R2 value to get more power.
Decrease R1 and R2 value to get more power.
This video from youtube shows how to build this circuit in easy steps:
Thanks.
