Indra,
Not really. One of my friend told me that he wants to use 12 v DC to 100 vac by an inverter that will be use in Auto rikshaw moving announment purpose. He wish to supply 50-0-50 vdc to his Audio amp and it must be classAB or ClassH type. I did wrong to mention 5kW but it might be 1k to 500W. He said there would be one circuit named " car battery chager" may be one kind of inverter.
what kind of money do you have in mind?.....i got news for you, the Chinese are dominant in these regards...
We think its possible to make one by more or less 35~40 usd. Chinese starts from 80 to 100usd here in local market. Not sure its real price what importers used to deal with them.
these folks are nuts.....😀 ilo ilo sound battle - Google Search
like these.....
An externally hosted image should be here but it was not working when we last tested it.
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i would tend to agree with your observation, class D has been around since 1970, but demands for higher and higher power i think makes them all the more relevant today...
Condense over fourty years in electronics in a single link?
No, sorry. And I'm social media free too. Currently reading (C.G.) Jung.
It seams to me that this guy wants someone to design a amp for him that he then can sell a lot of as a commercial product back in his country and then take the credit for the design.
"But, Chinese cheap products are dominating here. Suggest me any of your design that starts with lowest cost. For sure many customer wants good quality."
"But, Chinese cheap products are dominating here. Suggest me any of your design that starts with lowest cost. For sure many customer wants good quality."
Common horn type PA speaker comes in 20-60W type. Larger watts are not used for mobile purposes, except for riot control. I do not think you will need more than 70W amplifier for stated requirement and Class D should fit the need better than class AB.
Class H is more straightforward and idiot proof than class D at this power level. Switching these currents in 10 Nanoseconds has conflicting requirements. You need devices large enough to handle 100 amps and get the heat out, yet small enough not behave as a distributed network. If you slow down the switching to prevent nuisance burnouts due to distributed effects you end up dropping down in the 70-80% efficiency range - not to mention the increased distortion - and you may as well use class H. 1 microsecond switching is ok for class H, and dissipation will be several hundred watts (average) and 5kW (peak) distributed among 10 or 20 power transistors spread out over a foot or more. This is at least possible with the construction techniques you are likely to use. A bank of MJL21194’s or 4281’s and a couple big low voltage hexfets to switch rails works just fine. Nothing special or exotic is needed, and you don’t need a an HFSS simulation of the complete board layout.
I’ve been developing a 5kW 4 step class H over the past 10 or so years. Been through multiple iterations. I’ve had snowflake prototypes working, but making something manufacturable, serviceable, and road-hardy is not simple. The mechanical construction is more challenging than the electronics, which was proven out 10 years ago. And even the protection circuitry is more involved than the amplifier itself.
This clears it all about this crazy thread.
NO CLUE is the understatement of the year.
And the goal is to make a PA system for a street vending rickshaw.
Probably the korean version of our own:
Huevos blancos caseros - YouTube
suggest you watch the short video to understand the real market for this design.
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