Power Conversion for Clean Energy
Renewable energy is now among the cheapest sources of new electricity in many markets, and its growth depends on power electronics that convert variable solar and wind energy into stable, grid-compatible power. Solar string inverters, battery energy storage systems and electric-vehicle charging piles all share the same challenge: convert large amounts of power efficiently, reliably and safely over many years of outdoor service. China Resources Microelectronics, or CR Micro, supplies the power devices that make this possible, and BeiLuo distributes them with the application support renewable-energy designers rely on. This solution describes how CR Micro SiC MOSFETs, SiC JBS diodes and PIM IGBT modules fit into a modern renewable power architecture.
Solar String Inverters
A string inverter begins with a DC-DC boost stage that performs maximum power point tracking on each array string, followed by a DC-AC inverter stage that feeds the grid. In a three-phase design, six CRXQ75M120G4Z SiC MOSFETs form the grid-tie bridge. This 1200 V fourth-generation device is rated for 70 A with 34 mΩ typical and 45 mΩ maximum on-resistance in a TO-247 package. Its unipolar operation removes the turn-off tail current of silicon IGBTs, so the bridge can switch at high frequency without excessive loss.
Maximum Power Point Tracking
Maximum power point tracking extracts the greatest possible energy from every panel. The boost converter switches continuously and its diode conducts the full inductor current, so recovery loss in that diode is a direct efficiency drain. Replacing the boost diode with a CR Micro SiC junction-barrier-Schottky part removes most of that loss. The CRXB08D065G3 is a 650 V 8 A third-generation device with essentially no reverse-recovery charge, and the CRXI10D065G2 is a 650 V 10 A second-generation device with a low capacitive charge of 28 nC. Lower loss means more energy harvested per day and a better financial return for the installation.
Grid-Tie Stage and Filtering
Higher switching frequency in the grid-tie bridge allows smaller output inductors and capacitors, which reduces size, weight and cost. Because the SiC MOSFET switches cleanly, the output current ripple is small and the harmonic content is easier to manage, helping the inverter meet grid-code limits on current distortion. A well-designed gate loop with a controlled gate resistor keeps the fast switching from producing excessive ringing, and a film capacitor close to the bridge decouples the DC link.
Battery Energy Storage
Storage systems make renewable generation dispatchable by absorbing excess energy and releasing it when demand peaks. The power conversion system is bidirectional, charging the battery from the grid or solar source and discharging it back. Battery voltages are moderate while currents are high, so the CRXF300M075G3 is a strong fit: a 750 V third-generation SiC MOSFET rated for 160 A with 13 mΩ typical and 19 mΩ maximum on-resistance in a TOLL package. Its low on-resistance minimises conduction loss in the high-current path, and its fast switching keeps the converter compact.
Where the IGBT Module Fits
Not every stage needs the speed of silicon carbide. The three-phase grid interface of a large storage inverter benefits from the ruggedness and cost of an IGBT module. The CRGMP25T120DF2C3 is a 1200 V, 25 A PIM IGBT module that integrates the switches, freewheeling diodes and a temperature sensor in one insulated package, providing a robust, well-characterised grid stage. Combining SiC where speed matters with IGBT where ruggedness dominates gives an efficient yet economical system.
Electric-Vehicle Charging Piles
DC fast-charging piles convert AC grid power into a regulated DC output for vehicle batteries. The AC-DC front end and the isolated DC-DC stage both benefit from low-loss switching. SiC MOSFETs improve the isolated converter efficiency and allow higher switching frequency, which shrinks the transformer, while SiC JBS diodes such as the CRXI10D065G2 remove recovery loss in rectification. IGBT modules handle the energy-dense power stages where their robustness and cost are advantageous.
Reliability for Outdoor Deployment
Renewable equipment is installed on rooftops, in fields and at roadside charging sites, so it must tolerate wide temperature swings, humidity and electrical surges. Device selection is only part of the answer; the design must also protect against grid transients, provide adequate creepage and clearance, and manage thermal cycling. CR Micro devices are built on processes designed for these conditions, and the module and discrete packages offer the thermal paths needed to move heat to the enclosure. Surge protection on the AC and DC inputs, plus careful grounding, keeps the power stage within its safe operating area.
Supply Support from BeiLuo
Renewable projects scale quickly, and component availability can make or break a production schedule. BeiLuo holds genuine CR Micro inventory across the SiC MOSFET, SiC JBS diode and PIM IGBT module families, and coordinates replenishment against your build plan. Documentation and traceability ship with each order, and the field-application team can review efficiency, thermal and protection choices during design.
Getting Started
Request samples of the CRXQ75M120G4Z and CRXF300M075G3 SiC MOSFETs, the CRGMP25T120DF2C3 PIM IGBT module, and the CRXB08D065G3 and CRXI10D065G2 SiC JBS diodes. BeiLuo will map your system voltage, power level and grid requirements onto the CR Micro portfolio and propose a tailored bill of materials.