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single phase inverter using two npn transistors

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nxt_

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dear all,
greetings, could anyone tell me how this is circuit works? and what i need to do in order to make it works for 220v/50hz output
i will use it to control 75 watt ac motor.
thanks

NOTE: THE component mentioned below are for 120v/60 output.

Components list:

Part Total Qty. Description Substitutions
C1, C2 2 68 uf, 25 V Tantalum Capacitor
R1, R2 2 10 Ohm, 5 Watt Resistor
R3, R4 2 180 Ohm, 1 Watt Resistor
D1, D2 2 HEP 154 Silicon Diode
Q1, Q2 2 2N3055 NPN Transistor (see “Notes”)
T1 1 24V, Center Tapped Transformer (see “Notes”)
MISC 1 Wire, Case, Receptical (For Output)
 

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You have better inverter circuit on edaboard just search. This circuit is simple multivibrator to give life to square sine.

This circuit cant handle your needs make some better circuit. Calc inrush current of motor at start.
 
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    nxt_

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I have used this circuit to get the HV required for a capacitive discharge elctronic ignition for a car. The novel thing about it is that it is "bomb" proof, a short circuit on its output causes the circuit to oscillate at a very much higher frequency(50 KHZ) depending on the leakage inductance of the transformer.
Frank
 
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The circuit is simple, but according to 2N3055 guaranteed data doesn't necesserally work up to 75 W.

In the present version, I don't like, that Vbe is possibly driven into reverse zener breakdown, causing degradation of transistor performance. Tantalum capacitors aren't particularly suited for pulse currents, early failure may be a result. Empirical circuit improvements are surely possible, but better with solder iron and oscilloscope rather than pencil and paper.
 
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GOOD i need 75watt inverter for Sewing machine. the i/p dc voltage is 12Volt car battery, 3 days ago i made full bridge single phase inverter with four IGBT and pic18f452,4n35 as optocoupler, i only know this part, but the part of filtering and converting it to a good sine wave i am very confused in it. inaddition i need to know the relation between the load (inductive or resistive) and the (switching frequency,duty).

thanks.
 

nxt_ said:
GOOD i need 75watt inverter for Sewing machine. the i/p dc voltage is 12Volt car battery, 3 days ago i made full bridge single phase inverter with four IGBT and pic18f452,4n35 as optocoupler, i only know this part, but the part of filtering and converting it to a good sine wave i am very confused in it. inaddition i need to know the relation between the load (inductive or resistive) and the (switching frequency,duty).

thanks.
Click to expand...

You can search edaboard threads there is many threads about that, also You will find and circuits.

For first aid see this material :
 

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