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PMP8740: PMP8740 control mode

Roy Lin1
Prodigy 460 points
Part Number: PMP8740

Hi team,

Customer said it has voltage and current control loop in the circuit,

but in our firmware, it seems that it only has current control loop, is it correct?

Btw, they also want to know whether the battery is fully charged?

It seems that the internal fixed switching I_CMD 5A, 50A cannot know whether the battery is fully charged.

Thanks


								


				
				

				
			

		

			
						
									
                			    			                        
						
						
			
			
						
			                        
			
			
				
			  
			

			     
			

		


				    			

						
















	

	

					
    
	
    





		
	
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                          TI__Expert
                        5225 points
                      
    
                          
                   		
		
    
					
    Hi Roy,
    

    The PMP8740 was designed for a specific customer, and the customer wanted to develop the charging strategy internally.
    

    For this reason, the PMP8740 sets voltage levels (charging, trickle charging, idle, floating) and gives to the user just only the setting values. That means the charging strategy is not implemented since the firmware here is an open source. BTW, the charging strategy is pretty simple, and depends on the type of chemistry the customer is using. For GEL batteries, the microcontroller can just sets the current limit (settable in the menu), and sets the voltage level. As soon as the current is below a certain threshold (typically 10%) the level can be changed to trickle level. For Lead-Acid is a bit more complex, because you have also floating level, and the initial charge (a lower charging current, to avoid stressing the battery if it's completely depleted). Then, after reaching the float level, and verifying that the current is below a certain threshold, you may want to switch to trickle charging. As said, it's a pretty simple management of voltage and current levels, but all these parameters are already in the software....you just have to use them.
    

    Does it answer your questions? Please let me know.
    

    Best regards,
    

    Roberto
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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