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Old 7th December 2006, 06:36 AM   #1
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Default many chances in china for switching mode power supply

many chances in china for switching mode power supply. you are welcome to the enlish power supply design forum from china. http://www.hqeepower.com. you can disscuss about topologies, magnetics,PCB layout,simulation, MCU,DSP with chinese engineers and vendors, even then make good friends with them.
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Old 7th December 2006, 08:34 AM   #2
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Default thanks

i 'd like to the forum of www.diyaudio. com and www.hqeepower.com can be the communicate window between many chinese engineers&vendors and other countries' friends.
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Old 14th December 2006, 02:12 AM   #3
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Default 3kW LLC audio power supply

it's schematic of 3Kw LLC audio power supply
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Old 14th December 2006, 01:07 PM   #4
Eva is offline Eva  Spain
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- T2A and T2B are not wired properly.

- There is no current limiting at all.

- There is no regulation at all.

- All the peak current drawn by the amplifier has to go through the switching stage.

If you are trying to persuade us into thinking that there is sophisticated high-quality SMPS development going on in China, you have definitely chosen the wrong example circuit.
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Old 14th December 2006, 02:35 PM   #5
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Default no,it's ok and it has been MP for thousands PCS

thans for your studying of this schematic. you are welcome to dicuss about it, but it's a succeed audio power supply ,and it has been MP for several thousands of PCs.By the way T2A,T2Band T2c are right in the circuit. pleas look it carefully and think about it.
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Old 14th December 2006, 07:54 PM   #6
Andy F is offline Andy F  Spain
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Hi:

This is a plain copy of Chevin Research SMPS used on their line of pro amplifiers.

Uses a self oscillating circuit based on a diac and the gate transformer, the etd49 is designed to form a resonnant tank with the four 100n capacitors. The origin of this circuit is a ballast controller.

There are thousands of Chevin amps sold so if you take care of some not obvious details it works nice.

The circuit is patented.
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Old 15th December 2006, 07:09 AM   #7
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Default yes, you are right

Hi andy,
you are right, i am quite agree wiht your analysis. By the way, would you please tell me how and where to find the patent? thank you
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