An overvoltage protection circuit protects a portable electronic device against overvoltage. The overvoltage protection circuit includes an input unit for receiving an input voltage supplied by a voltage source; a voltage-divider module for dividing the in...

A charging method and a charging system are introduced for controlling a charging current by a PWM method. A charging IC (300) is controlled to supply the charging current to a battery (400), and a control unit (100) is used to generate a PWM signal with a...

A battery charge/discharge management system and method charge a battery according to an operation state of the battery. The system includes a reading module that reads a parameter of the battery; an analysis module that analyzes the parameter of the batte...

A backup battery charger charges a backup battery of a handheld electronic device. The handheld electronic device comprises a power supply unit and an electronic component. The power supply unit supplies a power to the electronic component. The backup batt...

A test auxiliary device for testing a portable data terminal having a plurality of sensors includes a base, a carrying unit, a driving unit, and a controlling unit. The carrying unit is disposed on the base and includes a carrying platform and a carrying b...

A status simulation testing method is for use in testing a portable device having at least one angular velocity sensor and includes positioning the portable device on an oblique plane; moving and flinging the portable device at an increasing velocity to en...