Design of minimal inductance of intrinsically safe boost DC-DC converters

To manage the inductance of intrinsically safe boost converters as small as possible and still meet the requirements of the desired output ripple voltage, the operating modes of Boost converters are divided into three types, i.e., the Complete Inductor Supply Mode (CISM), the Incomplete Inductor Supply Mode as well as Continuous Conduction Mode (IISM-CCM) and the Incomplete Inductor Supply Mode as well as Discontinuous Conduction Mode (IISM-DCM). The maximum ORV (MOVR) is deduced. It is concluded that the minimal inductance to guarantee the MOVR to be the lowest is the critical inductance between CISM and IISM in the case of the lowest input voltage and load resistance and the lowest MOVR is independent of the inductance; therefore, the design method of the minimal inductance is obtained. The experiment results are in positive to the analysis showing the feasibility of the proposed methods.