After searching for a car amplifier circuit, I came across a Lanzar amplifier circuit, in which there was also a converter from 12 Volts. And on its basis, a voltage converter of 12-220 volts was assembled. Pulls calmly two light bulbs of 150 watts. But it withstands even more - it launches a small grinder of 650 watts and a drill of 650 watts.
True, voltage drops to 190 volts. But the wires are heated 2 mm.kv. (from the battery to the converter), and with a removed power of 300 watts - with two bulbs of 150 watts, it practically does not sit down. The output voltage drop is only 5 volts!
Device Diagram:
The transformer was taken from a Soviet TV from a switching power supply. The rewind is rewound, the gap is narrowed (you can even take two such transformers - one half of the ferite from each, then you won’t have to grind anything). The transformer of the converter can be easily wound on rings glued together together 40x25x11, the primary is the same as TPI-3, the secondary is about 60 turns. The primary - two windings, three leads of 0.8 each in the shoulder of 5 turns, one shoulder and the second shoulder of 5 turns, and the secondary winding with two wires 0.8. Wound the secondary winding by the test method. First, half of the secondary with two wires 0.8 - the insulation layer, then the primary both shoulders, then the insulation layer again, the secondary again - it was this secondary that I adjusted to the voltage I needed, that is 230 volts.
He wrote about the power of 300 watts because it works quietly with such a load, the transistor keys do not even heat up, but for reliability it left a cooler. And already over three hundred keys and transics start to warm up a little.
This converter quietly launches any TVs with UPSs that are home theater. Drill a grinder, light bulbs of 150 (it was no longer easy). Chargers for cell phones, there was nothing more to check. In general, satisfied with the work done. He just started in the test, he wanted to check what happens, and he earned it even very normally. Here is a photo of the converter in the final assembly:
You can make the case out of anything, but the ATX PSU box is best - it is ideal for all elements of the device, including there is a ready cooler there. Assembled and tested the device - Ivan4370.