Power failure protection circuit and protection method

• Main Authors: XIE ZONGYI, XIE ZONGYING
• Format: Patent
• Language: Chinese; English
• Published: 18.01.2022
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

The invention relates to a power failure protection circuit and a protection method, and relates to the field of electronic circuits. The power failure protection circuit comprises a first port VCC1, a second port GND, a capacitive energy storage module, a first switch control module, an MCU module, a second switch control module, a protection module, a first voltage detection module and a current detection module, wherein an MCU chip controls a duty ratio of a PWM signal based on a first voltage detection value and a current detection value, and adjusts the magnitude of the current flowing through the capacitive energy storage module. The power failure protection circuit has the effect of conveniently storing the RAM data of a trip computer when an original storage battery of an automobile is replaced. 本申请涉及一种掉电保护电路及保护方法，涉及电子电路的领域；其中，一种掉电保护电路包括第一端口VCC_1、第二端口GND、电容储能模块、第一开关控制模块、MCU模块、第二开关控制模块、保护模块、第一电压检测模块及电流检测模块；其中，所述MCU芯片基于第一电压检测值及电流检测值，控制PWM信号的占空比，调节流经电容储能模块的电流大小。本申请具有便于在更换汽车原电瓶时保存行车电脑的RAM数据的效果。