Research On Intrinsic Safety Characteristics Of Buck Converter With Interleaving Integrated Magnetics

Electrical equipments used in coal mine must meet explosion-proof requirements.The paper puts the interleaving integrated magnetics techniques into Buck converter.The interleaving can reduce the output ripple voltage of the circuit and the coupledinductance can increace the equivalent electrical inductance to improve the electricalcharacteristics of the converter and ruduce the equivalent intrinsic safety inductance toimprove the intrinsic safety characteristics, which solve the contradiction between thebig inductance, big capacitance and the small inductance, small capacitance. Theintrinsic safety performance is meeted better. Firstly, it introduces the principle of theinterleaving and the interleaving integrated magnetics Buck converter, deduces thecritical indutance and the critical resistance of the inductance current continuousconduction mode and discontinuous conduction mode, the formula of the output ripplevoltage and the peak inductance current, analyzes the change law between the voltageand current and the load, input voltage and inductance. I uses the Matlab simulation tocheck them. Secondly, it analyzes the capacitance output disjunction characteristics andthe inductance short-circuit characteristic of the interleaving integrated magnetics Buckconverter, introduces the judgement of the nonexplosive intrinsic safety. Finally, itdesigns the main circuit and control circuit of the output intrinsic safety circuit. I usesthe Saber software to check them. And I set up the experiment circuit, whichdemonstrates the correctness of the theoretical analysis and the feasibility of the designmethod.