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Class D Switching Power Amplifiers and Power D/A conversion

Powersoft LITEMOD 4HC .... pic of underside of PCB??
Powersoft LITEMOD 4HC .... pic of underside of PCB??
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Old 28th March 2020, 11:16 AM   #21
Eva is offline Eva  Spain
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PSU is implemented with peak current control, and hard switched MOSFETs that produce a lot of heat at high current. It is a joke of a PFC, dirty as hell, current is not sine shaped at all, it just has a wider conduction period than a conventional rectifier. And they boast it as PFC.

I wanted to count the number of parts to compare it with my clean single stage PFC approach, variable frequency, microcontroller driven. Powersoft approach uses many small single-gate parts as opposed to my approach using quad resistors, dual transistors, etc. Placement effort/cost machine-wise is similar. My approach uses ~35% more parts, but does sine shaped current at any line voltage, and up to 2800W with E42 transformer, IGBT, soft switching (plus separate magnetics/heatsink thermal management, data logging, statistics). More on the subject can be read on this thread.

The ultimate amplifier SMPS. What comes after LLC? Single stage PFC.

The link points directly to a comparison between Pascal/Powersoft input current waveforms and current waveforms of my variable frequency MCU controlled PFC.

EDIT: That was another dilemma I had with my employer before being fired. He was persuaded by the usual suspects at audio fairs to think that a clean PFC was not worth the effort. He wanted to sell lots. He wanted to sell cheap. He wanted to sell junk.

Maybe someone could verify and post picture demonstrating that line current wise the Powersoft Litemod is as dirty as Pascal SPRO?
I use to feel like the small child in The Emperor's New Clothes tale
Rejected by switchmode electronics companies owned by guys who have never wound SMPS transformers, or use alias to ask for help.

Last edited by Eva; 28th March 2020 at 11:33 AM.
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Old 28th March 2020, 01:37 PM   #22
Baldin is offline Baldin  Denmark
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Impressive stuff, Eva
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