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The paper analyses some properties that are obtained when using load current measurements to control DC-DC power converters. The analysis is made for the buck, boost, and buck-boost converters with current mode control. The two major properties obtained are low output impedance and an almost invariant control-to-output transfer function for different loads. It is shown that the use of the load current is not feedforward when the load is a resistor. It can instead be seen as gain scheduling. The use of the load current for control affects the control-to-output transfer function, the output impedance, and the audio susceptibility. These effects are analyzed by use of accurate models of the converters. Simulation results are included in the paper.
Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual (Volume:1 )
Date of Conference: 2002