Power Factor Correction in Switch Mode Power SuppliesTeamAbstractMotivationComparison: Si pn vs. SiC SchottkyComparison (cont.)ImplementationSystem / HardwareDesign ConstraintsSlide 10Slide 11Testing SpecificationsSlide 13Current / Future WorkProject DeliverablesAcknowledgmentsQuestions?ReferencesPower Factor Correction in Switch Mode Power SuppliesUsing the SiC Schottky DiodeUsing the SiC Schottky DiodeTeamTeam LeaderTeam LeaderRobin KelleyRobin KelleyTeam MembersTeam MembersTravis BrignacTravis BrignacClinton LivingstonClinton LivingstonAbstractDesign a switch mode power supply with a Design a switch mode power supply with a new power factor correction circuit, which new power factor correction circuit, which implements the SiC Schottky diode.implements the SiC Schottky diode.Issue Application Note detailing use of the Issue Application Note detailing use of the SiC Schottky diode in power factor SiC Schottky diode in power factor correctioncorrectionMotivationCurrent power supply technology, uses Si Current power supply technology, uses Si pn junction diodes.pn junction diodes.These Si pn junction diodes create reverse These Si pn junction diodes create reverse recovery current problems within the power recovery current problems within the power factor correction (PFC) circuitryfactor correction (PFC) circuitrySiC Schottky diode will eliminate reverse SiC Schottky diode will eliminate reverse recovery current in PFC circuitryrecovery current in PFC circuitryComparison: Si pn vs. SiC SchottkyReverse biased pn Reverse biased pn junction diode does not junction diode does not turn off fast enough during turn off fast enough during switchingswitchingThis is due to the removal This is due to the removal of excess carries from the of excess carries from the depletion regiondepletion regionCauses reverse recovery Causes reverse recovery transienttransientComparison (cont.)SiC Schottky diodes SiC Schottky diodes do not need to remove do not need to remove excess carries from excess carries from the depletion regionthe depletion regionEliminates reverse Eliminates reverse recovery transient.recovery transient.ImplementationSwitch mode power Switch mode power supply industry is supply industry is extremely vastextremely vastNeed one specific Need one specific application for application for implementation of new implementation of new PFC circuitryPFC circuitryElectronic Ballast will Electronic Ballast will be used for be used for implementationimplementationSystem / Hardware120V ACDesign ConstraintsPower Factor Correction circuit operation of Power Factor Correction circuit operation of 100kHz100kHzSmaller passive componentsSmaller passive componentsMore efficient circuitryMore efficient circuitryOperation in Continuous conduction modeOperation in Continuous conduction modeReduced EMI problemsReduced EMI problemsEMI Filter operational at 100kHzEMI Filter operational at 100kHzDC-AC Inverter operation at 100kHzDC-AC Inverter operation at 100kHzAs frequency increases lamp efficiency increasesAs frequency increases lamp efficiency increasesDesign ConstraintsBallast must operate below IEC 1000-3-2 Ballast must operate below IEC 1000-3-2 Class C harmonic limitations of 30%Class C harmonic limitations of 30%Meet power loss and efficiency factor of Meet power loss and efficiency factor of 87% seen in current ballast design87% seen in current ballast designProduct will operate according to North Product will operate according to North American 120V/60Hz operationAmerican 120V/60Hz operationDesign ConstraintsOperating Temperature range of –20Operating Temperature range of –20ºº to to 50 50 ºº C CProduct will not exceed standard electronic Product will not exceed standard electronic ballast measurements of 8.3” x 2.22” x 1.6”ballast measurements of 8.3” x 2.22” x 1.6”Develop application note for use of the SiC Develop application note for use of the SiC Schottky diode Schottky diodeTesting SpecificationsSoftwareSoftwareP-Spice - used to layout original circuit design and run initial P-Spice - used to layout original circuit design and run initial simulationssimulationsOrcad Layout Plus – used to layout board design for circuitryOrcad Layout Plus – used to layout board design for circuitryHardwareHardwareO-scope – used to plot waveforms of voltages and currents to O-scope – used to plot waveforms of voltages and currents to determine correct operation of each stage of circuitry, detect noise determine correct operation of each stage of circuitry, detect noise and transients.and transients.Digital Multi-meter- used to measure and insure correct voltage Digital Multi-meter- used to measure and insure correct voltage and current levelsand current levelsThermo-couple- used to measure operating temperature of circuitryThermo-couple- used to measure operating temperature of circuitryTesting SpecificationsREQUIREMENTS PSPICEORCAD LAYOUT PLUSO-SCOPEDIGITAL MULTI-METERTHERMOCOUPLEInitial Circuit Design-Design Simulation-EMI Filter: Noise-Rectifier: DC Output- -PFC Circuit: Sw itching Frequency-PFC Circuit: Conduction Mode- -PFC Circuit: Reverse Recovery Transient -Inverter: AC output to load-Over All Circuitry: Temperature-Over All Circuitry: Pow er Loss-Over All Circuitry: Efficiency-Over All Circuitry: PCB Layout-Current / Future WorkFinalizing component sizing and selectionFinalizing component sizing and selectionWorking on circuitry designWorking on circuitry designP-Spice Simulations to complete designP-Spice Simulations to complete designProject DeliverablesElectronic ballast with operational PFC Electronic ballast with operational PFC circuitry using the SiC Schottky diode, circuitry using the SiC Schottky diode, redesigned EMI filter, and Inverter based on redesigned EMI filter, and Inverter based on an operating frequency of 100kHz.an operating frequency of 100kHz.Applications Note detailing the entire design Applications Note detailing the entire design process of the project and promoting the use process of the project and promoting the use of the SiC Schottky diode in power factor of the SiC Schottky diode in power factor correction.correction.AcknowledgmentsThank You to Dr. Michael S. Mazzola, our Thank You to Dr. Michael S. Mazzola, our advisor, for his guidance and input.advisor, for his guidance and input.Thanks to
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