LOAD CURRENT ESTIMATION DEVICE OF PWM CONVERTER

摘要

PROBLEM TO BE SOLVED: To solve the problem in providing a current detector, as a hard ware, which directly detects a load current with sure but is not favorable in cost.;SOLUTION: A load current estimating device operates stably, without providing a load current detector. A first means detects a filter reactor current (I_L), and a second means detects a filter capacitor voltage (V_C). A third means uses the filter reactor current (I_L), the filter capacitor voltage (V_C) acquired by the first and second means and a filter capacitor capacitance (C), to provide a load current estimated value based on the observer theory with these as inputs. Gains H₁ and H₂ of the observer which is stably designed provide a desired convergence characteristics when selected as an equation (7).;COPYRIGHT: (C)2004,JPO