Power electronics manufacturer Shenzhen Kehua has developed a 40 kW silicon carbide high-efficiency, low-noise charging module, which is intended to serve as a core component of a high-power EV charger.
The new module, which Kehua showed off at the recent Intersolar Europe exhibition in Munich, complies with CE and UL certifications, and meets EMC Class B standards. It is suitable for both European and American standard DC chargers.
Output voltage ranges from 150 to 1,000 VDC, and standby power consumption is less than 7.5 W. The module is capable of reporting operating time, enabling intelligent operation and maintenance.
The new charging module boasts a full load efficiency of ≥96% and a peak efficiency of ≥97%. Compared to traditional Si device designs, it improves efficiency by 1%, according to the company, allowing a single module to save as much as 1,226 kWh of electricity annually for a charging station operator.
The power module uses intelligent fan speed control technology to reduce noise—the fan speed is automatically adjusted depending on the inlet temperature, AC input voltage, DC output voltage and output current. The module supports three levels of Silent Mode, so users can set the appropriate level of noise reduction based on working conditions, application sites and environmental factors. At the highest level of Silent Mode, noise across the entire output voltage range can be reduced by as much as 65 dB.
Operating temperature range is -40° to 75° C, and Kehua says the module offers stable performance in both extremely cold and extremely hot environments. Even in temperatures as low as -40° C, the charging module can output full power without additional heaters. At extremely high temperatures (55-75° C), the module can still operate with linear derating, and it can still achieve half-load output at 75° C.
The module features low output current ripple: a peak-to-peak value of less than 3 A when ten modules are paralleled. According to the company, this ensures more stable charging and reduces cell heating.
Kehua has five manufacturing bases with a combined annual production capacity of 2 million units. The company is IATF 16949, ISO 14001 and ISO 9001 certified.
Source: Shenzhen Kehua
