The　zero-current　opening　strategy　can　effectively　improve　the　electrical　life　of　electromagnetic　switches.　However,　during　the　period　from　opening　operation　to　the　module　sending　the　opening　signal,　the　zero-current　opening　strategy　requires　the　control　module　to　have　energy　storage　elements　to　ensure　the　reliable　maintenance　of　the　electromagnetic　switch.　The　energy　storage　element　increases　the　volume　of　the　control　module,　which　is　difficult　to　meet　the　compact　design　requirements　of　electromagnetic　switches.　In　this　paper,　the　electrolytic　capacitor　behind　the　rectifier　bridge　in　the　control　module　is　used　as　the　energy　storage　capacitor,　and　a　capacity　minimization　design　method　based　on　mathematical　model　is　proposed.　By　analyzing　the　charge　transfer　process　of　the　energy　storage　capacitor　in　each　working　mode　of　the　electromagnetic　switch　coil　drive　circuit,　building　the　model　of　the　capacitance　and　the　operation　time　of　the　electromagnetic　switch　after　opening　operation.　According　to　the　maintenance　time　required　for　zero-current　opening,　the　minimum　capacity　of　the　energy　storage　capacitor　is　established　to　make　the　volume　of　the　control　module　as　small　as　possible.　©　2023,　Beijing　Paike　Culture　Commu.　Co.,　Ltd.