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Sinewave UPS in dsPIC

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UroBoros

UroBoros

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Hi
Sine wave UPS is made with even PIC16F72.
But nowadays I see Sine wave UPS made with dsPIC.
What is the main advantage?

Thanks
 

Dsp chips is used because of it's additional future's such as comparator's, op-amps,ADC,DAC,etc which you only configure them for their uses.
 
Hi,
Another reason maybe, 16F72 based UPS -es are usually using heavy iron core transformer. The DSC based ones are SMPS, where using the DSC greatly improves performance and also makes it easy to design the circuit.

Hope this helps.
Tahmid.
 
Last edited:
Tahmid said:
Hi,
Another reason maybe, 16F72 based UPS -es are usually using heavy iron core transformer. The DSC based ones are SMPS, where using the DSC greatly improves performance and also makes it easy to design the circuit.

Hope this helps.
Tahmid.
Click to expand...


Hi thamid

Can you just give simple explanation about how can we reduce Core loos by using dsPIC? ,
Do you know how can use Center alaiened PWM for PUSH PULL switching [only wave form is required]?
 

we might want to read the datasheet of the DSPIC , by manipulating some registers in the timers section , we can easily choose which PWM mode you need .

In addtion , The special PWM modules found in modern dspics are amazing with very highb resolution (16bits) and work on a wide range of freqeuncies .

good luck if you are trying to design one :p
 
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Tahmid said:
Hi,
Another reason maybe, 16F72 based UPS -es are usually using heavy iron core transformer. The DSC based ones are SMPS, where using the DSC greatly improves performance and also makes it easy to design the circuit.

Hope this helps.
Tahmid.
Click to expand...




hi thamid Can you tell me how can we reduce the core loss , i think because of unipolar switching , am i right ? , And can we reduce the transformer heat? i think Mosfet heat should become increase ,because DsPIC switching is highrthan w.rt. normal micro. and mosfet swiching freaq :is directly proppotional to mosfet heat . am i currect ?

My Mail ID : ismailpp2008 gmail acoount .
 

ismailpp2008 said:
hi thamid Can you tell me how can we reduce the core loss , i think because of unipolar switching , am i right ? , And can we reduce the transformer heat? i think Mosfet heat should become increase ,because DsPIC switching is highrthan w.rt. normal micro. and mosfet swiching freaq :is directly proppotional to mosfet heat . am i currect ?

My Mail ID : ismailpp2008 gmail acoount .
Click to expand...

Are you talking about ferrite core or regular iron core?

The dsPIC can operate at higher frequencies than 8-bit PICs, AVRs, etc but the frequency that will dictate the MOSFET switching losses is the switching frequency. You can choose a low switching frequency to reduce switching losses. Or you can choose a high switching frequency to reduce the size of the magnetics and capacitance required for filtering. You have to make a tradeoff. Although, with good driving circuit, the switching losses should be lower than the conduction losses which are the main source of losses. If you suspect you'll have much higher switching frequencies, you may try to use MOSFET "banks" with lower on-state resistance (Rdson) so that the overall conduction losses are lower and overall heating is also kept within limits. You must use good heatsinks and cooling.

Hope this helps.
Tahmid.
 
Last edited:
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Tahmid said:
Are you talking about ferrite core or regular iron core?

The dsPIC can operate at higher frequencies than 8-bit PICs, AVRs, etc but the frequency that will dictate the MOSFET switching losses is the switching frequency. You can choose a low switching frequency to reduce switching losses. Or you can choose a high switching frequency to reduce the size of the magnetics and capacitance required for filtering. You have to make a tradeoff. Although, with good driving circuit, the switching losses should be lower than the conduction losses which are the main source of losses. If you suspect you'll have much higher switching frequencies, you may try to use MOSFET "banks" with lower on-state resistance (Rdson) so that the overall conduction losses are lower and overall heating is also kept within limits. You must use good heatsinks and cooling.

Hope this helps.
Tahmid.
Click to expand...

am tellinh about iron core , and what is the benifit of ferrate core ?
And how can we simulate dsPic30F through PC ,[like proteus] ? any software?
 

ismailpp2008 said:
am tellinh about iron core , and what is the benifit of ferrate core ?
And how can we simulate dsPic30F through PC ,[like proteus] ? any software?
Click to expand...

By using ferrite core, you can make a 2-stage inverter, where the first stage (the stage employing the ferrite core) steps up the low-voltage DC to a high-voltage DC. The second stage converts this high-voltage DC to sine wave AC output. The advantage is that you don't need to use the huge bulky iron core transformer, reducing cost, weight (and usually) size.

I don't know of any dsPIC30F simulation. However, Proteus ISIS can be used to simulate some dsPIC33F microcontrollers.

Hope this helps.
Tahmid.
 
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