Circuit for saving electric quantity of standby power capacitor

The utility model relates to the technical field of saving the electric quantity of a standby power capacitor, in particular to a circuit for saving the electric quantity of a standby power capacitor, which comprises a standby power capacitor module, a buck-boost power supply module, an onboard module, an inductance module, a first voltage division module, a second voltage division module, a comparator and a controller, the boost-buck power supply module is connected with the standby power capacitor module, the onboard module, the inductor module and the first voltage dividing module are connected with the boost-buck power supply module, the inductor module is further connected with the onboard module, the first voltage dividing module and the second voltage dividing module are connected with the onboard module, and the comparator is connected with the first voltage dividing module and the second voltage dividing module. And the controller is connected with the comparator. On the premise that the cache of the