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how to increase the out put of this ac to dc inverter for 20W flourescent lamp ?

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ziad khan

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can any plz tell me how to increase the out put this inverter, its giving 180v ac @20 mA. i need to light 20W energy saver with it.
 

In a short, the transistor's current gain and resistor dimensioning are defining the inverter input current and thus the maximum power.

To increase it, the resistor values have to be reduced. But also the transistor and transformer rating must fit the intended power. Simple self oscillating inverters, as the present one have generally limited efficiency. For a 20 W version, an external control oscillator and a two transistor push-pull circuit may be preferable.
 

as far as the resistors are concerned i have reduced it but no use. can u plz show me the diagram coz the inverter circuit in market is same as u are talking about . its using two transistors, a 7 pin ferrite core and inductor also. first i dont know why 7 pins?(mine is having 6 pin only, 4 input (2 primary,2 feedback) and 2 output secondary)
how the push pull works ? also what is eternal control oscillator? and how to get it.
simply plz show me the diagram if possible.
my coursemates( as an assignment) have copied the circuit from commercially avialable inverters but i want to make it myself.
( 4 ur info i am aerospace engineer but have have great interest in power electronics)
 

I don't have a circuit at hand now, I also didn't recently analyze existing products. A usual push pull transformer inverter connects the center tap to the supply voltage and a transistor to each end of the respective end. But there are different ways to connect the feedback winding, often it has a center tap, too.

An external control oscillator is an additional transistor circuit or an IC. But perhaps you should try with a self oscillating push-pull circuit first.
 

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