To improve the electrical characteristics(such as the output power, low output voltage ripple) of essential safety source, this article will introduces interleaving magnetic integrated theory to the essential safe source and proposes the concept of the Equivalent electrical inductance and essence safety inductance, through increasing electrical inductance and reducing essence safety inductance to makes converter improve electrical characteristics, while it meet inner-intrinsic safety characteristics. Taking the three-phase interleaving magnetic integrated Boost converter for example, by analysis of the internal intrinsic safety characteristics of the converter, the internal intrinsic safety criterion of the converter is got. and compared with the conventional single-channel Boost converter while the two types of converter meet the internal intrinsic safety characteristics, it can obtain that the interleaving magnetic Boost converter effectively improve electrical characteristics, Finally, through experiment confirm the correctness of theoretical analysis.