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AN ADAPTIVE NONLINEAR CURRENT OBSERVER 
FOR BOOST PFC ACDC CONVERTERS 
ABSTRACT: 
PFC is an essential part of AC/DC converters in order to improve 
the quality of the current drawn from the utility grid. The PFC closed-loop 
control system requires a precise measurement of the boost 
inductor current in order to tightly shape the input current. Current 
sensors are widely used in the PFC closed-loop control system to 
measure the boost inductor current. Current sensors introduce delay, and 
noise to the control circuitry. Also, they significantly contribute to the 
overall cost of the converter. Therefore, they make the implementation 
of the PFC converter complicated and costly. Current sensor less control 
techniques can offer a cost-effective solution for various applications. 
The unique structure of boost PFC converter makes it challenging to 
robustly estimate the inductor current due to the nonlinear structure of
the converter. Also, it is shown in this paper that the system loses 
observability at some singular operating points, which makes the 
observer design more challenging. In addition, the load value is 
unknown in most applications. Thus, the observer should be able to 
estimate the inductor current in presence of uncertainties in the load and 
other parameters. 
BLOCK DIAGRAM 
Dc source 
Boost design 
Boost design 
Driver unit 
Controller 
Output
CONTROLLER CIRCUIT: 
 PIC controller 
OUTPUT: 
 Hardware 
 simulation 
TOOLS: 
 MP Lab 
 Orcad/Pspice 
 Matlab /simulation

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JPEEE1412 An Adaptive Nonlinear Current Observer for Boost PFC AC/DC Converters

  • 1. AN ADAPTIVE NONLINEAR CURRENT OBSERVER FOR BOOST PFC ACDC CONVERTERS ABSTRACT: PFC is an essential part of AC/DC converters in order to improve the quality of the current drawn from the utility grid. The PFC closed-loop control system requires a precise measurement of the boost inductor current in order to tightly shape the input current. Current sensors are widely used in the PFC closed-loop control system to measure the boost inductor current. Current sensors introduce delay, and noise to the control circuitry. Also, they significantly contribute to the overall cost of the converter. Therefore, they make the implementation of the PFC converter complicated and costly. Current sensor less control techniques can offer a cost-effective solution for various applications. The unique structure of boost PFC converter makes it challenging to robustly estimate the inductor current due to the nonlinear structure of
  • 2. the converter. Also, it is shown in this paper that the system loses observability at some singular operating points, which makes the observer design more challenging. In addition, the load value is unknown in most applications. Thus, the observer should be able to estimate the inductor current in presence of uncertainties in the load and other parameters. BLOCK DIAGRAM Dc source Boost design Boost design Driver unit Controller Output
  • 3. CONTROLLER CIRCUIT:  PIC controller OUTPUT:  Hardware  simulation TOOLS:  MP Lab  Orcad/Pspice  Matlab /simulation