When a single-chip computer (MCU) is working, if there is a sudden power failure due to some reason, the data in the data memory (RAM) will be lost, and all the information of the previous work will be flushed. In order to maintain the data in the data memory (RAM) when the power is suddenly lost, to ensure the stable and reliable operation of the MCU system and the safety of data information processing, although there is a large-capacity filter capacitor in the main power supply of the MCU, when the power is lost, the MCU can generally maintain the work for about half a cycle (10ms) by relying on the energy stored in the capacitor. For this reason, it is required that once the city power is instantly cut off, there must be a power supply that can re-send power in less than 10ms to ensure the normal operation of the MCU system. This task is completed by UPS. The interference caused by the instantaneous power failure of the power system will cause calculation errors and data loss of the MCU. With UPS, the MCU system can work continuously and reliably. In addition to using UPS for the MCU system, the following introduces an effective backup power supply.
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