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滞环电流控制BUCK-BOOST转换器中的电流检测电路设计 Introduction: TheBUCK-BOOSTconverterisaversatileandwidelyusedDC-DCpowerconversiontopologythatcanregulateoutputvoltageandcurrentlevelswhilealsoprovidingbothstep-upandstep-downcapabilities.Theseconvertersareusedinvariousfieldssuchastelecommunications,automotive,andaerospace.Toenhancetheconverterperformance,precisecurrentsensingandcontrolarenecessary. Inthispaper,wewilldiscussthedesignofacurrentsensingcircuitforaBUCK-BOOSTconverter.Thecircuithastobedesignedtoaccuratelysensetheinductorcurrentoftheconverter,whichiscriticaltotheoverallperformanceoftheconversionprocess. CurrentSensingTechniques: Currentsensingtechniquesarewidelyusedinpowerelectronicsforfeedbackcontrol.Thereareseveralmethodstomeasuretheinductorcurrent,suchasseriesresistor,halleffectsensor,currenttransformer,andshuntresistor. SeriesResistorTechnique: Theseriesresistortechniqueisasimplemethodtosensethecurrent,whereaseriesresistorisplacedinserieswiththeinductor.Thevoltagedropacrosstheresistorisproportionaltotheinductorcurrent.Thevalueoftheresistorischosensuchthatthemaximumvoltagedropacrosstheresistoriswithinthemeasurementrangeofthesensingcircuit.Thistechniqueissimplebuthasthedisadvantageofpowerlossacrosstheresistor,whichisundesirableforhighpowerapplications. HallEffectSensorTechnique: TheHalleffectsensorisanon-invasiveandcontactlessmethodusedtosensethemagneticfieldgeneratedbytheinductorcurrent.Thesensorisplacedneartheinductorandsensesthemagneticfieldgeneratedbythecurrent.Theoutputvoltageofthesensorisproportionaltothecurrentflowingthroughtheinductor.Thistechniqueishighlyaccurateandhasminimalpowerlossacrossthesensingelement.However,itisrelativelyexpensiveandrequirespropercalibrationandsetup. CurrentTransformerTechnique: Thecurrenttransformertechniqueisahighlyaccurateandnon-invasivecurrentsensingtechniquethatinvolvesamagneticcoreandawinding.Theinductorcurrentispassedthroughthewinding,whichgeneratesamagneticfieldproportionaltothecurrent.Themagneticfieldinducesavoltageinthesecondarywin