USB charger with electric power display and a method for electric power display

摘要

The invention discloses an USB charger with electric power display of battery being charged and a method for electric power display of battery being charged in an electronic cigarette. The USB charger includes an USB interface, a battery unit and a charging control unit, and further includes an electric power display unit. The charging control unit, being separately connected to the USB interface, the battery unit and the electric power display unit, controls an external power supply charging a battery in the battery unit through the USB interface, tests voltage of the battery being charged directly or indirectly, and further controls the electric power display unit to show updated electric power of the battery being charged in real time to user who can know current charging state of the battery.

主权项

1. An USB charger with electric power display for battery being charged, comprising:
an USB interface; a battery unit; a charging control unit; and an electric power display unit; wherein, the charging control unit is separately connected to the USB interface, the battery unit and the electric power display unit; the charging control unit controls an external power supply charging a battery in the battery unit through the USB interface, tests voltage of the battery being charged directly, and further controls the electric power display unit to show updated electric power of the battery being charged in real time; the charging control unit includes: a micro controller, a charging management circuit and a sampling voltage circuit, and the battery unit includes the battery; the USB interface is connected to the charging management circuit separately connected to the battery and the sampling voltage circuit, the sampling voltage circuit is connected to the micro controller separately connected to the charging management circuit and the electric power display unit; the micro controller controls the charging management circuit outputting charging voltage to the battery, the micro controller further controls the sampling voltage circuit detecting the voltage of the battery being charged, and the electric power display unit showing electric power of the battery being charged; the charging management circuit includes a charging control chip, a first capacitor and a first resistance, the charging control chip is connected to the USB interface via the first resistor, the charging control chip is also connected to one end of the first capacitor and the positive of the battery, another end of the first capacitor is connected to the negative of the battery; and type of the charging control chip is VA 7204, type of the micro controller is SN8P2712.