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Old 3rd October 2005, 12:10 PM   #1
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Default pulse generator for an inverter

hi to all members an colleges in this forum
Am an amature in design but i hope to become perfect in the neer future so please may any one assist me.
I have been desgning an inverter operating on 50hz using SG3525 PWM as a driver for two o/p and using NE555 as an astable multivibrator to clock SG3525 am getting a problem that the o/p on pins 11&14 of sg3525 are 3.6vdc which produce very little power when driving IRFP250 to drive a transformer for o/p as compared to when used sg3525 internal oscillator why? please assist.
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Old 3rd October 2005, 02:43 PM   #2
Eva is offline Eva  Spain
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And why don't you use the internal oscillator? It can go as low as 50Hz (but you actually need a 100Hz clock), as opposed to what the datasheet states.
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Old 14th October 2005, 05:04 PM   #3
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A more complicated way to do it, like commercial inverters, If you want AC power, just use the SG3525 at say 20 or 30khz, to drive a transformer to power an H-Bridge circuit. Then you can hook the load to an h-bridge, and drive that with a seperate 50 or 60hz oscillator. Gives you true AC out.
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Old 4th November 2005, 06:03 PM   #4
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Quote:
Originally posted by mbates14
A more complicated way to do it, like commercial inverters, If you want AC power, just use the SG3525 at say 20 or 30khz, to drive a transformer to power an H-Bridge circuit. Then you can hook the load to an h-bridge, and drive that with a seperate 50 or 60hz oscillator. Gives you true AC out.
I agree.

He could make a circuit driving mosfets to drive a HF transformer at 20-30Khz or so such as found in a computer PSU. Connect the mosfets to the low-voltage side of the transformer, and the HV side will produce 160-200V which you would then connect to a bridge recifier and capacitor to turn to DC, which then 4 more mosfets in an H-bridge can be used to turn that int0 50/60 hz AC.
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Old 4th November 2005, 06:25 PM   #5
Eva is offline Eva  Spain
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This is how commercial 12V to 120V/220V inverters work.
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Old 4th November 2005, 06:39 PM   #6
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lol your transparent eva. You didnt even read my post did you, pay attention to the very beginning of it. hehe
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