- Joined Jan 24, 2017
How are these designs built to handle high current looking at the size of the high frequency transformer in comparison with the basic transformer inverters
Can I get a simple circuit diagram of one..the ones I see online are a bit complex..I would love to build oneThey inlude power MOFETs or IGBTs switching at a high frequency (typically hundreds of kHz), thus only requiring small high-frequency transformers instead of chunky mains-frequency transformers. The high frequency signal is pulse-width modulated with a low frequency (usually 50Hz or 60Hz) sinusoidal modulation envelope. When demodulated by low-pass filtering, the result is a 50/60Hz sine wave.
Yeah ..I missed that.. I'm currently working on an power bank project and was looking at incorporating a low power transformer less inverterI don't know of any. I can only recommend that you start with a simpler project, to avoid frustration/disappointment.
With only 6V input, a 500W 220V output will require an input current of about 90A. How do you plan to source that?
Maybe I was wrong with my description..but I needed a mini inverter just like those used in car cigarettes lighter.. obviously they do not have those chunky transformer in them..I want to incorporate that into my multipurpose power bank designA Google of "500 Watt inverter circuit" should get you a few dozen circuits to look over.
As to an:
H-bridge inverter circuit
Featured snippet from the web
An H-bridge is an electronic circuit that switches the polarity of a voltage applied to a load. ... Most DC-to-AC converters (power inverters), most AC/AC converters, the DC-to-DC push–pull converter, most motor controllers, and many other kinds of power electronics use H bridges.
You are describing a DC to AC power inverter.
That does not mention the output frequency? Another consideration is the output waveform? Cheap simple designs might output a MSW (Modified Sine Wave) rather than a TSW (True Sine Wave) and some just output a square wave. Next power is power expressed in watts. Therefore 500 watts / 220 volts = 2.37 amps. Your primary side will require 500 watts / 6 volts = 84 amps on your battery and that assumes 100% efficiency which is not possible. With 12 volts it gets down to about 42 amps and 24 volts about 21 amps. A 24 volt 100 AH battery won't even get you 4 hours of operation.6-12v input and 220vac output..max power 500w
I'm in Africa where our equipment uses 50/60 HzThat does not mention the output frequency?
The output waveform is not really a problem to me ..a modified sine wave would do the job..my laptop charger is smart enough I guess as it has a complex smps circuitryAnother consideration is the output waveform?
I don't understand this..are you saying I can't get 50Hz with such circuitry ?You are also not likely to find a way around a large clunky transformer if you want a 50/60 Hz output frequency, it's just the nature of the beast.
I am saying that if you require 50/60 Hz the transformer will be large and bulky. Years before inverters were gaining in popularity all of the AC systems on aircraft were 400 Hz. The reasoning was 3 phase 400 Hz power could use smaller lighter transformers in aircraft electrical systems. The 50/60 Hz designs come with a price of weight and cost.I don't understand this..are you saying I can't get 50Hz with such circuitry ?
If power in is equal to power out where does the heat come from that I need to remove? Wow, maybe it's free?You would be surprised at the number of people on this website that don't believe that. Most of them long time members here. I got reported for arguing it wasn't possible in another thread.
Have a read of this thread - https://forum.allaboutcircuits.com/threads/energy-from-reciprocating-beam.170561/If power in is equal to power out where does the heat come from that I need to remove? Wow, maybe it's free?
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