Presentation: Introduction To The Cool Bypass Switch For Photovoltaic Applications

Transcript

Presentation of SPV1001 Francesco Pulvirenti Photovoltaic BU ST Positioning in the Photovoltaic World Photovoltaic Converter Block Diagram - Up to 400VDC: Viper Technology - Over 400VDC: VHV MOSFET and ESBT Technology - R&D Solar Cells - R&D Electronics on Plastic - Motion Sensors AUX SMPS • Zigbee - PLM Communication Metering Junction Box - Schottky Diodes - Smart Diodes - MPPT/BOOST Converter DC/DC converter - Microcontrollers Gate Drivers MV/HV MOSFET HV IGBTs ESBTs AC/DC converter - Metrology ICs ST solutions 250W; 1kW ; 3kW Reference Designs 1 Functionality of Bypass Diodes offer alternative  path to current prevent  hotspot 3 SPV1001: Cool Bypass Switch CATHODE - CATHODE Overall power dissipation  is significantly reduced! + Junction box Standard Bypass diode Cool Bypass Switch ANODE ANODE CATHODE Charge pump PV Panel controller Block diagram ANODE System in package 4 2 SPV1001: Applications D2PAK Lamination in flat panels Junction boxes MLPD 5x6 TO-220 Concentrated PV 5 SPV100x: Power Dissipation in Forward 5 4 Power dissipation [W] BYPASS DIODE 1 3 BYPASS DIODE 2 2 SPV1001 1 SPV1002 0 1 2 3 4 5 6 7 8 9 10 Biasing current in forward [A] Typ. current of a 6” poly‐crystalline cell at maximum irradiation 6 3 SPV1001: Heat Dissipation Comparison 5A 6A 7A 8A Heat dissipation comparison in ambient at 25oC and without dissipation tools A = BYPASS DIODE 2 B = BYPASS DIODE 1 C = SPV1001T40 Note: photograph taken in thermal stability 7 SPV1001: Thermal Performances Comparison I-forward SPV1001 BYP DIODE 1 6.00A 97oC 153oC 8 00A 8.00A 105oC 178oC 10.0A 118oC - 12.0A 141oC - I- fwd Î V-reverse SPV1001 BYP DIODE 2 6 00A Î 40V 6.00A No runaway No runaway 8.00A Î 40V No runaway Thermal runaway 10.0A Î 40V No runaway - 12.0A Î 40V No runaway - 8 4 SPV100x: Leakage in Reverse Polarity 1000 Forbidden area for thermal runaway Leakage current [mA] 100 BYPASS DIODE 2 10 BYPASS DIODE 1 125C 1 115C 105C 95C 0.1 85C SPV1001 SPV1002 0.01 0.001 5 10 15 20 25 30 35 40 Biasing voltage in reverse polarity [V] Note: acquisitions made in steady state condition 9 SPV100x: Energy Savings ¾ Energy produced per installed capacity (1KWp) 1200 KWh ¾ Power dissipated by the bypass diodes in 1KWp PV array 20mA*13V*15=4W ¾ Energy dissipated per installed capacity (1KWp) 4W*3000h=12KWh 10 5 SPV1001: Benefit Summary ¾ Key Features • CBS has very low VF & IR • IF=15A, two voltage ratings: V =15A two voltage ratings: VR=30V & 40V =30V & 40V • High robustness to surge and lighting current • TO220, D2PAK & MLD packages ¾ Key Benefits • Power saving Î Power saving Î gaining money gaining money • Lower power dissipation Î cooler temperature / longer life time / higher  reliability • Higher current capability Î new business opportunity 11 Roadmap for photovoltaic applications SPV1060 - Flylight SPV1040 - Sirius SPV1020 - Phoebus SPV1001 - CBS 12 6