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<import namespace="http://xbrl.sec.gov/exch/2020-01-31" schemaLocation="https://xbrl.sec.gov/exch/2020/exch-2020-01-31.xsd" />
<import namespace="http://xbrl.sec.gov/naics/2017-01-31" schemaLocation="https://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd" />
<import namespace="http://xbrl.sec.gov/sic/2020-01-31" schemaLocation="https://xbrl.sec.gov/sic/2020/sic-2020-01-31.xsd" />
<import namespace="http://xbrl.sec.gov/stpr/2018-01-31" schemaLocation="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd" />
<import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
<import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
<import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd" />
<import namespace="http://xbrl.sec.gov/dei/2019-01-31" schemaLocation="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd" />
<import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
<import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
<import namespace="http://fasb.org/us-types/2020-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2020/elts/us-types-2020-01-31.xsd" />
<import namespace="http://fasb.org/srt-types/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-types-2020-01-31.xsd" />
<import namespace="http://fasb.org/srt/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd" />
<element name="CommonClassUndefinedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_CommonClassUndefinedMember" substitutionGroup="xbrli:item" />
<element name="SalesAllowancesCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="vicr_SalesAllowancesCurrent" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="CommonStockVotesPerShare" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="vicr_CommonStockVotesPerShare" substitutionGroup="xbrli:item" />
<element name="PaymentOfContingentConsideration" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_PaymentOfContingentConsideration" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="IncreaseDecreaseInDeferredRevenue1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_IncreaseDecreaseInDeferredRevenue1" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="IncreaseDecreaseInCurrentAssetsAndLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_IncreaseDecreaseInCurrentAssetsAndLiabilities" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="ProvisionBenefitForDoubtfulAccounts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_ProvisionBenefitForDoubtfulAccounts" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="FairValueOfAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_FairValueOfAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" substitutionGroup="xbrli:item" />
<element name="ScheduleOfRevenuesBasedOnGeographyLocationTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_ScheduleOfRevenuesBasedOnGeographyLocationTableTextBlock" substitutionGroup="xbrli:item" />
<element name="ScheduleOfChangesInContractAssetsAndLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_ScheduleOfChangesInContractAssetsAndLiabilitiesTableTextBlock" substitutionGroup="xbrli:item" />
<element name="ProvisionForIncomeTaxesAndEffectiveIncomeTaxRateTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_ProvisionForIncomeTaxesAndEffectiveIncomeTaxRateTableTextBlock" substitutionGroup="xbrli:item" />
<element name="AmortizedCostAndFairValueDebtSecuritiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_AmortizedCostAndFairValueDebtSecuritiesAbstract" substitutionGroup="xbrli:item" />
<element name="UnrealizedLossesOnShortTermAndLongTermInvestmentsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_UnrealizedLossesOnShortTermAndLongTermInvestmentsTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="UnrealizedLossesOnShortTermAndLongTermInvestmentsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_UnrealizedLossesOnShortTermAndLongTermInvestmentsLineItems" substitutionGroup="xbrli:item" />
<element name="AggregateTemporaryImpairmentLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_AggregateTemporaryImpairmentLoss" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="AuctionFailedSecuritiesUnrealizedLossPositionMinimumPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_AuctionFailedSecuritiesUnrealizedLossPositionMinimumPeriod" substitutionGroup="xbrli:item" />
<element name="PeriodForWhichFailedAuctionSecuritiesBeenInUnrealizedLossPosition" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_PeriodForWhichFailedAuctionSecuritiesBeenInUnrealizedLossPosition" substitutionGroup="xbrli:item" />
<element name="AvailableForSaleSecuritiesDebtMaturitiesYearTwentySixAmortizedCostBasis" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTwentySixAmortizedCostBasis" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="AvailableForSaleSecuritiesDebtMaturitiesYearTwentySixFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTwentySixFairValue" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAndDeductionsAdditionalCreditLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAndDeductionsAdditionalCreditLosses" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ContingentConsiderationObligationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_ContingentConsiderationObligationMember" substitutionGroup="xbrli:item" />
<element name="FairValueMeasurementsValuationTechnique" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_FairValueMeasurementsValuationTechnique" substitutionGroup="xbrli:item" />
<element name="FairValueMeasurementUnobservableInputs" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_FairValueMeasurementUnobservableInputs" substitutionGroup="xbrli:item" />
<element name="WeightedAverageRateUseToMeasureFairValue" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="vicr_WeightedAverageRateUseToMeasureFairValue" substitutionGroup="xbrli:item" />
<element name="CumulativeProbabilityOfDefaultMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_CumulativeProbabilityOfDefaultMember" substitutionGroup="xbrli:item" />
<element name="CumulativeProbabilityOfEarningMaximumRateUntilMaturityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_CumulativeProbabilityOfEarningMaximumRateUntilMaturityMember" substitutionGroup="xbrli:item" />
<element name="CumulativeProbabilityOfPrincipalReturnPriorToMaturityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_CumulativeProbabilityOfPrincipalReturnPriorToMaturityMember" substitutionGroup="xbrli:item" />
<element name="LiquidityRiskPremiumMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_LiquidityRiskPremiumMember" substitutionGroup="xbrli:item" />
<element name="RecoveryRateInDefaultMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_RecoveryRateInDefaultMember" substitutionGroup="xbrli:item" />
<element name="UnderwrittenPublicOfferMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_UnderwrittenPublicOfferMember" substitutionGroup="xbrli:item" />
<element name="StockholdersEquityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_StockholdersEquityLineItems" substitutionGroup="xbrli:item" />
<element name="CountryUsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_CountryUsMember" substitutionGroup="xbrli:item" />
<element name="AllothercountriesmemberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_AllothercountriesmemberMember" substitutionGroup="xbrli:item" />
<element name="BrickproductsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_BrickproductsMember" substitutionGroup="xbrli:item" />
<element name="AdvancedproductsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_AdvancedproductsMember" substitutionGroup="xbrli:item" />
<element name="DirectcustomerscontractmanufacturersandnonstockingdistributorsmemberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_DirectcustomerscontractmanufacturersandnonstockingdistributorsmemberMember" substitutionGroup="xbrli:item" />
<element name="StockingdistributorsnetofsalesallowancesmemberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_StockingdistributorsnetofsalesallowancesmemberMember" substitutionGroup="xbrli:item" />
<element name="NonrecurringengineeringmemberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_NonrecurringengineeringmemberMember" substitutionGroup="xbrli:item" />
<element name="RoyaltiesmemberMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_RoyaltiesmemberMember" substitutionGroup="xbrli:item" />
<element name="DeferredExpensesCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="vicr_DeferredExpensesCurrent" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="IncreaseDecreaseInRevenue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="vicr_IncreaseDecreaseInRevenue" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="EmployeeStockPurchasePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_EmployeeStockPurchasePlanMember" substitutionGroup="xbrli:item" />
<element name="IncomeTaxDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_IncomeTaxDisclosureTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="IncomeTaxDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="vicr_IncomeTaxDisclosureLineItems" substitutionGroup="xbrli:item" />
<element name="CommitmentOnCapitalExpenditure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="vicr_CommitmentOnCapitalExpenditure" substitutionGroup="xbrli:item" xbrli:balance="credit" />
</schema>
