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Energy Analysis of High Frequency 3 Phase



		

			

									
					    cgreen03
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 30, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I have been trying to find the best way to measure 3 phase power for my thesis. My thesis works with RC hobbyist size BLDC motors. I am looking at better modeling the speed controller's efficiencies. Therefore I am measuring the DC power in and the AC power out. 
    
 
    The AC power out is:
    
 
    PWM
    
 
    Voltage unipolar square-wave
    
 
    3 phase with no common ground
    
 
    motor takes about a 6-8 kHz signal frequency
    
 
    But the Speed controller has a switching frequency of 12 kHz
    
 
    Vrms= 2-24VAC
    
 
    Irms=0.2-80AAC
    
 
    I can reduce said Vrms limits and Irms limits to achieve better accuracy.
    
 
    I looked into the ADE 7762 but its Bandwidth looks too small.
    
 
    Suggestion on which units I should use?
    
									
			        
		
    

				
						
        

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Aug 1, 2014 8:57 PM
            
            
					
      
	
      

		
		
      
					
      Hi Clayton Green
      
 
      Almost all of the energy metering and monitoring products (ADExxxx) are targeted at working with 50/60Hz fundamental signals and within 2KHz/3.3KHz bandwidth, to compute powers. Only a very few parts like ADE7762 work with a 14KHz bandwidth. But working with PWM signals is not common. How much bandwidth are you looking for? 
      
 
      Also, the ADE ICs work well with sine waves and bipolar inputs. For square waves and unipolar signals, I need to understand your expectations and application scope a little bit more and work with you to resolve the differences.
      
 
      Before that, I would recommend that you also post this question in the ADC community to see if you can get an apt ADC with desired bandwidth. If not, you can always come back here and post your proposed system level block diagram and state your expected bandwidth along with what you are trying to measure (with accuracy expectations).
      
 
      Regards
      
 
      hmani
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Aug 1, 2014 8:57 PM
            
            
					
      
	
      

		
		
      
					
      Hi Clayton Green
      
 
      Almost all of the energy metering and monitoring products (ADExxxx) are targeted at working with 50/60Hz fundamental signals and within 2KHz/3.3KHz bandwidth, to compute powers. Only a very few parts like ADE7762 work with a 14KHz bandwidth. But working with PWM signals is not common. How much bandwidth are you looking for? 
      
 
      Also, the ADE ICs work well with sine waves and bipolar inputs. For square waves and unipolar signals, I need to understand your expectations and application scope a little bit more and work with you to resolve the differences.
      
 
      Before that, I would recommend that you also post this question in the ADC community to see if you can get an apt ADC with desired bandwidth. If not, you can always come back here and post your proposed system level block diagram and state your expected bandwidth along with what you are trying to measure (with accuracy expectations).
      
 
      Regards
      
 
      hmani
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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