This supercapacitor module can be installed on a DIN rail to ensure temporary power supply to the driver in the event of a power failure, allowing sufficient time to immediately close the connected electronic expansion valves (1 or 2). With this capacitor module, there is no need to install a solenoid valve. It is designed based on supercapacitor technology. Compared with modules using ordinary batteries, it has a longer service life and more charge and discharge cycles, ensuring the long-term reliability of the product. The module adopts highcurrent charging technology, and it can fully close all brands of electronic expansion valves after 5 minutes of charging.