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Project Background:
Home charging stations and public fast-charging piles face severe challenges in complex electromagnetic environments. Issues such as electrostatic discharge (±8 kV contact discharge, ±15 kV air discharge) during the plugging and unplugging of charging guns, power grid surges, and creepage failures in high-humidity environments can easily lead to the breakdown of charging control chips and communication interruptions.
Product Models Used:
Based on successful industry examples, the core power devices used in EV chargers include:
| Product Type | Applications | Recommended Models/Specifications | Typical Performance |
| SS34 Schottky Diode | CP signal control circuitry, reverse polarity protection, ORing redundant power management | 40V/3A, SMB package | Forward voltage drop of 0.55V; diode reduces conduction losses by 30% |
| Silicon Carbide (SiC) Schottky Diode | Three-phase full-bridge rectification for DC fast-charging stations, high-voltage auxiliary power supplies | 1200V/1700V SiC solutions | Supports 800V–1000V high-voltage platforms with efficiency up to 98.5% |
| Fast Recovery Diode / FRED | Rectification for low-voltage auxiliary power supplies | Trr ≤ 50ns specifications | Compatible with high-frequency switching topologies exceeding 200kHz |
Issues Addressed:
• Charging interruptions and system reboots caused by electrostatic discharge (ESD) (in a supercharging station project, the charging interruption rate was reduced by 82%)
• High conduction losses in traditional silicon diodes, affecting overall charging station efficiency
• Excessive EMI in high-frequency switching scenarios
Project Achievements:
• The ESD diode withstands 1,000 cycles of ±15kV air discharge, with a performance degradation rate of <5%.
• The SiC+SS34 combination solution boosts charging station efficiency to 98.5%.
• Signal response time is <5ns, ensuring stable communication between the charging station and the vehicle’s BMS.
