Intelligent charger with universal serial bus (USB) interface

Abstract

The invention relates to an intelligent charger with a universal serial bus (USB) interface. AC 220V current sequentially passes through a sorting circuit, a filtering voltage-stabilization circuit and a voltage transformation circuit and then is output to a USB device to be charged, the output end of the voltage transformation circuit is connected with a charging state detection circuit, a USB interface of the USB device to be charged is connected with a pull and plug detection circuit, the output ends of the charging state detection circuit and the pull and plug detection circuit are connected with a device comprehensive state logic operation circuit, the output end of the device comprehensive state logic operation circuit is connected with an on/off control circuit, the output end of the on/off control circuit is connected with the output end of a rectification circuit and can be used for switching on/off the input of a power supply, and the output end of the voltage transformation circuit is used for controlling duty cycle of a switching tube in the voltage transformation circuit according to a control signal output from a voltage-stabilization control circuit. By the intelligent charger, the access and the pull-out of a charging device are intelligently detected, power is automatically cut off from a source head after the device is pulled out, charging is automatically carried out after the device is inserted, and power is automatically cut off after the charging is full; and meanwhile, the intelligent charger has an overcurrent protection function, and the power supply is automatically cut off when overcurrent occurs so as to prevent an accident.

Description

technical field [0001] The invention relates to a charging device, in particular to an intelligent charger with a USB interface. Background technique [0002] With the rapid development of high technology, the functions of smart devices such as mobile phones are constantly updated, and people spend more and more time on smart devices. At present, the charging capacity of the device can be displayed in real time during the charging process, but the power cannot be automatically cut off after it is fully charged, so the device is often powered on for a long time. Not only will it cause a waste of energy, but it will also reduce the service life of the equipment, and even pose a safety hazard. On the other hand, after unplugging the device, many people will not unplug the charger for convenience, so that the charger is always in a state of power consumption, and the charging cable is exposed, which also poses a safety hazard. [0003] With the development of battery technolog...

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problem of hidden dangers in the use of current charging equipment, and proposes a USB interface intelligent charger, which can detect and identify the insertion and removal of equipment, and control the on-off of the power supply in combination with the charging state of the battery. It is a more energy-saving, safe and reliable charger. Smart charging device for

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