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power factor correction circuit

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desertkids

desertkids

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power factor correction with the uc3854

hi,i need to do a power factor corretion circuit now as my course project.. can you give me some good example of power factor corretion?thanks...
 

uc3854 using pfc circuits

Hello,

don't know if you are looking for a real PFC design or a principal circuit. Real designs are complex and have to consider many implementation specific details, thus it's difficult to say what's a "good circuit". You can browse a semiconductor manufacturers datasheets and reference designs to get an idea. E. g. www.ti.com, search for power managment, power factor correction IC. PFC application range is a few 10 W to MW...

Regards,
Frank
 

VVV said:
There are good examples on the TI website. Just do a search on UC1854. Or try the Unitrode seminars.
https://focus.ti.com/lit/ds/symlink/uc1854b.pdf
This is a example from SEM1500
**broken link removed**
Click to expand...

ya,actually i need do a power factor correction circuit with use of hall effect current transducer LEM 100-P, how can i measure the power factor from this device and do a power factor correction circuit to maintain the power factor between 0.9 to 1. i have no other specification to do this circuit..thanks...
 

The links I provided will explain how to design a PFC. The chip will maintain the PF within very reasonable limits. I have designed PFCs in the past and I can tell you that a PF of 0.9 is poor. You can easily get 0.98 with the UC3854, more likely 0.995.

I am not familiar with the sensor you mention.
 

VVV said:
The links I provided will explain how to design a PFC. The chip will maintain the PF within very reasonable limits. I have designed PFCs in the past and I can tell you that a PF of 0.9 is poor. You can easily get 0.98 with the UC3854, more likely 0.995.

I am not familiar with the sensor you mention.
Click to expand...

ya..thank for your information. can i know what is the relation between UC3854 and slup203?and how i connect UC3854 to get this PFCs?actually my supervisor give me a hall effect current transducer but i not really clear how its connection and function..
 

That appnote explains how to design a PFC in general, not the use of the UC3854 in particular, although everything applies to that circuit.

I am not exactly sure what you need. Do you need to design a PFC circuit, that is a power circuit that corrects the power factor for the DC/DC power supply that follows, or do you need just to measure the PF?
Because from what you are saying, that you were given a sensor, it sounds like you are suppoed to just measure the power factor.

The UC3854 simply uses a resistor to sense the current. You could potentially use the Hall effect sensor you have to do that, but it would probably mean a lot of complications, if the output needs to be shifted, gain adjusted, etc.
 

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