Audio smps 700w (IR2153)

Just to let you understand more the schematic. Pin 6 is VS, that is the centre between the 2 mosfets. Here the direction of current flow changes polarity every half cycle.
As more current is drawn by the mosfets a ripple is generated the more current the larger the amplitude of the ripple. We are now sensing this AC ripple but blocking any DC path with the small capacitor.
Now this ripple is rectified and sampled so that when a certain voltage is reached it will trigger the protection. In the V2 an SCR. this scr will pull the supply pin to ground hence switching off the smps.

It is now important to add again the 200R resistor and remove the diode at the start up section. The scr when trggers stays on until the smps is disconnected. If left on without this resistor it will eventually burn the transistors in the startup circuit due to excessive curent.
What I am saying is that between schematic and pcb (V2) there are inconsistencies.
20210529_193505.jpg20210529_193403.jpg
RC 330K ----->PIN#6 (IR2153) in board. No schematic.
 

Silvio

Active member
Please note that you marked the IC pins wrong. Pin 1 starts at the dot on the IC. ( EX what you marked pin3 is pin6)
On the schematic there is a small mistake but it is still tied to the center of the HB. If its before or after the primary does not make a difference.
 
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Please note that you marked the IC pins wrong. Pin 1 starts at the dot on the IC. ( EX what you marked pin3 is pin6)
On the schematic there is a small mistake but it is still tied to the center of the HB. If its before or after the primary does not make a difference.
The numbers that I marked from 1 to 6, are not corresponding to the IC, but they would be the connection pins of the mini pcb to my main pcb (power)
 

Silvio

Active member
rev 2 de silvio very coll.....
1) I cannot see the soft start resistor. The triac mt1 and mt2 terminals should be across it.
2) you only need 1 bridge rectifier at this power, no need for 2.
3) the 15v regulators need heatsink and also the triac at the input.
If this is the revision 2 version i see you built the one with high frequecy soft start and short circuit protection. Is that correct?
 

lcpimenta

New member
Choice of oscillators and protection

The PCB can be adopted to work with a different oscillator as mentioned before due to the oscillator board and protection circuit is mounted on a separate pin header. This is plugged in the socket provided on the pcb. I also made plans to use different protection circuitry using either a Schmitt trigger or driving an SCR gate with both options pulling down pin 3 of the IR2153 to ground. However these type of protection brings out the need to reset by switching off the supply and waiting for the bulk cap to discharge until it can be switched on again. I prepared the prototype pcbs for these but have not been tried yet

Heat sink and cooling

Um bom dissipador de calor é necessário para os fets e diodos de saída, pois eles são acionados com bastante força durante o pico de saída. Com o dissipador de calor usado, os smps podem controlar a energia facilmente se um pequeno ventilador estiver incluído. Disponibilizei uma tomada para ventoinha por este motivo. Na minha configuração, a potência de pico pode ser mantida por um longo tempo sem que as coisas esquentem com o ventilador ligado. Este foi colocado ao lado para resfriar também o transformador

Saída auxiliar.

Uma saída auxiliar de 12v-0-12v é fornecida com capacidade de cerca de 800mA. Destina-se a acionar um estágio de pré-amplificador ou algum circuito de proteção em um amplificador. Muitas vezes vejo a necessidade de uma saída separada por esse motivo.

A tensão de projeto do smps é 46-0-46 de pico na entrada de 230 volts. Durante meus testes, a tensão de saída caiu para 78 volts a 9,4 amperes. A tensão de entrada era de 227vac com uma potência de 730watts. A eficiência dos smps atingiu 90%.

SE ALGUEM ESTAR INTERESSADO EM CONSTRUIR ESTE SMPS, ENVIAREI O ARQUIVO PDF DE FORMA PRIVADA

View attachment 6150
Boa tarde. Você poderia me enviar os arquivos deste projeto? luizcpimenta@gmail.com Obrigado.
 
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