Abstract: A power-supply mode switching circuit and an aerosol generating device are provided. The power-supply mode switching circuit includes an external-power-source power-supply circuit, a protection circuit, and a battery power-supply circuit. A node where the external-power-source power-supply circuit is connected to the protection circuit serves as a power-source input end. A node where the external-power-source power-supply circuit is connected to the battery power-supply circuit serves as a power supply end. The protection circuit is configured to control the battery power-supply circuit to be cut off when the power-source input end is connected to the external power source, to make the external power source supply power to the power supply end. The protection circuit is further configured to control the battery power-supply circuit to be conducted when the power-source input end is not connected to the external power source, to make the battery supply power to the power supply end.

Abstract: A multi-level compression method for picture data includes: obtaining original data by performing modulo operation on a picture to-be-compressed; obtaining a first storage amount and a second storage amount by respectively storing the original data in a first container and a second container and calculating a size of data in the first container and a size of data in the second container; determining a bit length of index data, and constructing a color table and an initial index table; obtaining a target color table by identifying a minimum value in the color table and subtracting the minimum value from each data in the color table; obtaining a first compressed index table by compressing the initial index table according to the bit length; and obtaining a second compressed index table by identifying a locator in the first compressed index table and compressing the first compressed index table according to the locator.

Abstract: The present application discloses a lead-acid system and intelligent system, the lead-acid battery system comprises a measuring and controlling module disposed in the housing of the lead-acid battery, used to collect the status parameters of the lead-acid battery in use; the measuring and controlling module comprises a first communication port; a gateway module, comprising a third communication port, a second communication port and a processor unit, the gateway module collects the status parameters collected by the measuring and controlling module by establishing communication with the first communication port of the measuring and controlling module through the first communication port thereof, to provide for the processor unit to analyze whether the status parameters are abnormal or not; the second communication port of the gateway module is used for remote communication and to send out the collected status parameters.