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  <xsd:element name="ConversionOnOrAfterFebruary152031Member" id="aeis_ConversionOnOrAfterFebruary152031Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CashConsiderationPaidForDebtExchange" id="aeis_CashConsiderationPaidForDebtExchange" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="CashFlowNoncashInvestingDisclosureAbstract" id="aeis_CashFlowNoncashInvestingDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtInstrumentConvertibleConversionRateIncreasedByInConnectionWithRedemption" id="aeis_DebtInstrumentConvertibleConversionRateIncreasedByInConnectionWithRedemption" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ConvertibleSeniorNotesDueTwoThousandTwentyEightAndTwoThousandThirtyOneMember" id="aeis_ConvertibleSeniorNotesDueTwoThousandTwentyEightAndTwoThousandThirtyOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RonFosterMember" id="aeis_RonFosterMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DavidReedMember" id="aeis_DavidReedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EduardoBernalAcebedoMember" id="aeis_EduardoBernalAcebedoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PaulOldhamMember" id="aeis_PaulOldhamMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ElizabethVonneMember" id="aeis_ElizabethVonneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AdjustmentsToAdditionalPaidInCapitalUnwindOfNoteHedgeAndWarrant" id="aeis_AdjustmentsToAdditionalPaidInCapitalUnwindOfNoteHedgeAndWarrant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="TaxImpactOfConvertibleNotes" id="aeis_TaxImpactOfConvertibleNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtInstrumentConvertibleObservationPeriodTradingDays" id="aeis_DebtInstrumentConvertibleObservationPeriodTradingDays" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
