Aiming　at　the　problem　of　using　electrolytic　capacitors　to　reduce　the　service　life　of　the　light-emitting　diode　(LED)　driver,　a　single-stage　electrolytic-capacitor-free　LED　driving　circuit　topology　based　on　isolated　interleaved　parallel　Boost　PFC　converter　was　proposed.　The　LED　driver　consists　of　an　interleaved　parallel　Boost　converter　and　an　auxiliary　power　balance　circuit.　The　different　power　between　input　and　output　was　balanced　by　the　auxiliary　power　balance　circuit.　Therefore,　the　low　frequency　ripple　of　the　output　current　can　be　reduced.　The　working　principle　and　switch　mode　of　this　topology　were　analyzed　in　detail.　On　the　basis　of　the　proposed　topology,　the　generation　mechanism　of　the　low-frequency　ripple　of　the　output　current　of　the　circuit　was　analyzed,　a　low-frequency　ripple　control　strategy　suitable　for　the　circuit　topology　was　proposed,　a　specific　implementation　scheme　was　given,　and　the　key　parameters　of　the　circuit　were　designed.　Finally,　a　40　W　single-stage　LED　driver　without　electrolytic　capacitor　was　designed　and　tested.　The　experimental　results　show　that　both　the　output　filter　capacitor　and　the　auxiliary　energy　storage　capacitor　can　be　reduced　to　6.6　μF　and　the　output　current　ripple　can　be　reduced　to　16.7%,　so　that　film　capacitors　with　smaller　capacitance　can　be　used　instead　of　electrolytic　capacitors,　which　improves　the　service　life　and　reliability　of　LED　driver.　©　2021,　Harbin　University　of　Science　and　Technology　Publication.　All　right　reserved.