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Hello, everyone! Has anyone done any research on high frequency booster? I need to make a particularly small inverter to turn dc12v into dc700v. It will use SG3525 to drive the mos tube, promote the high frequency transformer to boost voltage and rectify, and get DC high voltage. However, my pcb needs to be plugged into a stainless steel tube with a diameter of 20mm, so the pcb can only be very small. My difficulty is how to make 300w power in such a small space, which requires excellent mos tubes. Reasonable transformer, reasonable pcb, please help, thank you
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google = self oscillating mosfet inverter
+ https://www.tradewheel.com/p/high-vo...re-2043781/
change frequency to high (20kHz ) R1,C1 so you can use small ferrite core transformer. -
You probably need to be looking at a synchronous boost converter topology using SIC FETs and switching at a reasonably high frequency, say 100kHz or so, depending on your control method and driving devices. (Going higher will make the magnetics smaller but increase switching losses, so it's a bit of a trade-off). If you have access to 'PLECS', this is a great piece of software for simulating this type of circuitry. (Not cheap unfortunately - but you can get an evaluation license for 3 months)Comment
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Thank you all! Continue to listen to your valuable adviceComment
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I don't have the software PLECS, let alone use it. I need to design it on a pcb board of 15mmX80mm or even shorter and install it into a pvc pipe with a diameter of 20mm, so it can only use horizontal components. For such a small space, can we use an AC transformer in parallel, because the power of one transformer cannot reach 300W? And a single large current mos tube, please give me ideasComment
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check the size of 100W
core EE40,
https://pcbartists.com/design/power-...-flyback-smps/
size
https://www.magnet-tech.com/core/MnZ...ferrite/EE.htm
Are you sure you need 300W ?
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Hi jeep6789,
This project is very hard to design. Power 300W in 20mm diameter metal tube is big challenge. with 90% efficiency, the hot for spreading will be 33W. This is the hot from one good soldering iron. The tube will be very hot. This hot is not possible to be distracted from one ferrite transformer in 20mm tube. Only solution is to design 12VDC to 120VDC 50W isolated converter and use 6pcs. connected in series. The concept is present in attached file.Comment
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Ferrite rings 10x6x4mm have to be used ( 2 or 3pcs staked) in every converter. SMD components - TO-252 for power transistors and diodes. In any case, the single converter will be 5-6cm long as minimum. The tube have to be well perforated for good cooling ( if waterproof requirement absents).Comment
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MOSFETs have to be with Rds on as low as 10mR.Comment
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Hello! My expression is correct. My pcb board can be installed in a metal tube with a diameter of 20mm, sealed, and then injected with transformer oil to dissipate heat. The metal tube is 30cm long.Originally posted by Detectorist#1 View PostComment
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O.K. In 30cm long tube, this project is possible with SMD components and careful positioning of the components.Comment
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I think the simplest way is to use sg3525 to push two transformers, two transformers secondary parallel or series, to improve the power, so we must choose excellent transformers and mos tubesOriginally posted by Detectorist#1 View PostComment
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The hot from every one transformer will be 12-15W and it is not possible to conduct this hot to the metal tube.Comment
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The transformer's oil will boil and the pressure will blow sealing tabs.Comment
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the metal tube have to be connected with expansion vessel - heating of the transformer's oil will made pressure to the sealing tabsComment
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