The high-precision real-time clock module RX8901CE can operate at a maximum working temperature of+105 ℃, assisting the stable operation of photovoltaic inverters

Apr 11,2024
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Photovoltaic inverter is a power adjustment device composed of semiconductor devices, mainly used to convert DC power into AC power. It generally consists of a boost circuit and an inverter bridge circuit, and often comes with an energy storage unit for peak valley voltage smoothing. As a key component in photovoltaic power plants, the reliable operation of photovoltaic inverters affects the stability and efficiency of the entire photovoltaic power plant. And it integrates a timing module internally, using a real-time clock module to provide an accurate and low-power clock source for recording the time of events.

RX8901CE is a real-time clock module launched by EPSON with an extremely wide operating temperature range and high reliability. Its excellent performance can be applied in various complex and high demand application scenarios, including products such as photovoltaic inverters

Wide operating temperature range from -40 to+105 ° C

Due to the fact that photovoltaic inverters operate under intense direct sunlight conditions, the surface temperature of the product can often approach 85 ℃, and even exceed 85 ℃ in some hot and sunny areas. At this point, extremely high requirements are placed on the weather resistance of the product, and ordinary components cannot adapt well to this extreme high temperature environment, often resulting in various abnormalities. Thanks to advanced manufacturing technology, RX8901CE breaks through the limitations of traditional devices and has an ultra wide operating temperature range of -40 ℃ to+105 ℃, which can adapt well to the high-temperature operating environment of photovoltaic inverters and ensure stable system operation.

Temperature drift characteristics as low as ± 5ppm

The function of the timing module in photovoltaic inverters determines that they must have precise clock timing for automatic start stop event recording, power regulation detection, etc. But general real-time clock circuits cannot provide accurate clock timing, let alone in extremely harsh environments above 85 ℃. And EPSON integrates the calibrated 32.768kHz DTCXO into the RX8901CE, combined with its unique temperature compensation algorithm, allowing it to have ultra-low temperature drift performance as low as+5ppm within -40~+105 ℃, equivalent to only 13.2 seconds of drift per month! It can enable photovoltaic inverters to obtain accurate clock timing at all times, providing a solid foundation for overall efficient operation.

Working current as low as 240nA

When the photovoltaic inverter experiences a power outage, the system will switch to low-power operation mode and rely on a backup power source to maintain the system's operation for a period of time to record events and status. Due to cost and efficiency considerations, the capacity of backup power sources is generally not very large, which requires circuit components to maintain the lowest possible working current to maintain stable operation of core functions. Due to the use of C-MOS technology and power management module, RX8901CE has an extremely low typical operating current of 240nA at a working voltage of 3V. Under such a low operating current, the overall power consumption of the system can be effectively reduced, providing a strong guarantee for low-power endurance.