DC - DC inverter(12V -> 310V), insufficient output current

[peterl86]

Hi guys,
i am making DC-DC converter with following parameters:
Uin: 10.8 - 14.4V
Uout: ~310V
Pout: ~150W

The circuit is H bridge and used transistors are IRF2807. They are controlled with IR2110. Over transistors have
diodes(FR604) to protect them from reverse voltage. Transformer is YE ERL-35 from ATX power supply Codegen 350W.
I am using 12v winding for primary winding. The problem is that when i connect load(two electric bulb 60W series)
voltage drops to ~20V, current on output is very small. I tryed with three different frequencies: 25, 50, 100kHz
and different duty cycle 1 - 20%, but no change. The pwm is generated by mcu(stm32f100). Later i will upload circuit.
Thank's in advance !

 

[barry]

You need 120W on your output, which means your input has to supply 10 Amps at 12 volts (not taking efficiency into account). Can your supply provide that current?

 

[peterl86]

You need 120W on your output, which means your input has to supply 10 Amps at 12 volts (not taking efficiency into account). Can your supply provide that current?

The problem was in the transformer. I replaced it with another of the same type. Now the output power is ~100W. My supply
can provide more than 20A at 12 volts.