Charger with overvoltage and overcurrent protection and protection method thereof

Abstract

The invention discloses a charger with overvoltage and overcurrent protection and a protection method thereof. The charger with the overvoltage and overcurrent protection comprises a first interface (100), a second interface (300), a voltage stabilizing unit (400), a control unit (600), an input voltage sampling unit (500), a switch unit (200) and a current sampling unit (700); the voltage stabilizing unit (400) is used for receiving input voltage of an external power source and providing constant working pressure for the control unit (600); the control unit (600) is used for controlling turn-off or turn-on of the switch unit (200) according to whether input voltage detected by the input voltage sampling unit (500) is excessive or not or real-time charging current detected by the current sampling unit (700) is excessive or not; accordingly a protection action of the circuit is achieved. According to the charger with the overvoltage and overcurrent protection, when the charger is in overvoltage or overcurrent, the voltage stabilizing unit provides the constant working voltage for the control unit, normal work of the control unit is guaranteed, and then a power supply and a battery pole are protected from being burnt or losing efficacy by stopping charging the battery pole through the control unit.

Description

technical field [0001] The invention relates to the field of electronic cigarettes, in particular to a charger with overvoltage and overcurrent protection and a protection method thereof. Background technique [0002] At present, most of the USB chargers of the battery poles of electronic cigarettes on the market have weak protection against overvoltage at the input end and overcurrent at the output end. [0003] The overvoltage protection of the input terminal is vulnerable: the common USB charger has an overvoltage protection capability of only 6V, and a higher input voltage (greater than 6V) will overvoltage burn the USB charger, and then burn the e-cigarette battery rod during charging. ; [0004] The vulnerability of the overcurrent protection at the output terminal is as follows: when the output terminal of the USB charger is overcurrent or short-circuited, there is no corresponding protection measure, and a large output current will burn out the USB charger. [0005...

AI Technical Summary

Problems solved by technology

[0005] There are also some USB chargers on the market that do not even have overvoltage or overcurrent protection functions at all. When a higher voltage is applied to the input terminal of the USB charger, the USB charger does not control the overvoltage, and directly transmits the input voltage to the output terminal. This will burn out the e-cigarette battery rod during charging; or when the output terminal of the USB charger is short-circuited, there is a risk of power supply failure or burnout because there is no short-circuit protection

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