Abstract: A printed circuit board assembly includes a circuit board, a heating resistor and a switch. The circuit board includes a component layer, a signal layer, a conductive layer and a conductive via. The component layer includes a mounted area for mounting a component. The signal layer includes first and second signal traces. The conductive layer is disposed between the component layer and the signal layer. The component layer includes a conductive pattern. The conductive via connects the first signal trace to the conductive pattern. The heating resistor includes a first terminal electrically connected to the first signal trace and a second terminal electrically connected to the second signal trace. The conductive pattern, the conductive via, the first signal trace, the heating resistor, the switch and the second signal trace are electrically connected in series between a power supply voltage terminal and a ground terminal.

Abstract: A battery detection circuit and a battery detection method are provided. The battery detection circuit includes battery gauge circuits and a processing circuit. The battery gauge circuits read battery information of batteries, and the battery information at least includes a current battery capacity, a current temperature and a current cell voltage. The processing circuit receives and processes the battery information, and performs: determining whether a battery temperature of any one of the batteries is greater than a designated temperature; if negative, determining whether the current cell voltage of any one of the batteries is lower than a designated voltage, and if affirmative, adjusting the corresponding current battery capacity to generate a reported battery capacity.

Abstract: A battery safety management procedure applicable to a battery safety management system is provided. The battery safety management system includes a controller, storage, and battery. The battery safety management procedure is stored in the storage and executed by the controller to perform steps of: determining whether a power level of the battery is greater than or equal to a power level threshold and determining whether a power storage time is greater than or equal to a time threshold; and performing a discharging procedure when the power level of the battery is greater than or equal to the power level threshold, and the power storage time is greater than or equal to the time threshold. Time control and power level control prevents the battery from being in a prolonged state of high power level to reduce the chance of battery swelling, leaks, abnormalities, and damage, thereby extending battery service life.

Abstract: An electronic device includes a system circuit, a power connector, a path selection circuit, a plurality of battery connectors, a plurality of series circuits, and a control circuit. The power connector is suitable for receiving power. The path selection circuit is coupled to the system circuit and the power connector. The battery connectors are respectively suitable for coupling a plurality of batteries. The series circuits respectively correspond to the battery connectors, and each series circuit is connected between the corresponding battery connector and the path selection circuit. Each series circuit includes: a charging switch, a battery switch and a discharging path. In a sequential discharge mode, the control circuit controls the series circuits to turn on the battery switch thereof in turn and controls the path selection circuit to connect the series circuits to the system circuit. The remaining battery switches and all charging switches remain off.

Abstract: A charging method includes detecting whether two battery modules are balanced, simultaneously charging the two battery modules by a first charging current when the two battery modules are balanced, and executing a specific charging procedure when the two battery modules are not balanced. The step of executing the specific charging procedure includes charging by the first charging current a first battery module between the two battery modules that is not balanced and disconnecting the other between the two battery modules, and simultaneously charging the two battery modules by a second charging current upon the first battery module reaching balance, wherein the second charging current is less than the first charging current.

Abstract: A battery safety management procedure applicable to a battery safety management system is provided. The battery safety management system includes a controller, storage, and battery. The battery safety management procedure is stored in the storage and executed by the controller to perform steps of: determining whether a power level of the battery is greater than or equal to a power level threshold and determining whether a power storage time is greater than or equal to a time threshold; and performing a discharging procedure when the power level of the battery is greater than or equal to the power level threshold, and the power storage time is greater than or equal to the time threshold. Time control and power level control prevents the battery from being in a prolonged state of high power level to reduce the chance of battery swelling, leaks, abnormalities, and damage, thereby extending battery service life.

Abstract: A charging method includes detecting whether two battery modules are balanced, simultaneously charging the two battery modules by a first charging current when the two battery modules are balanced, and executing a specific charging procedure when the two battery modules are not balanced. The step of executing the specific charging procedure includes charging by the first charging current a first battery module between the two battery modules that is not balanced and disconnecting the other between the two battery modules, and simultaneously charging the two battery modules by a second charging current upon the first battery module reaching balance, wherein the second charging current is less than the first charging current.

Abstract: A power protection method for an electronic device includes supplying power to an electronic device through a power supply path, detecting a positive current of the power path, detecting a negative current of the power path, comparing a current amount of the positive current with a current amount of the negative current, and disconnecting the power path when the current amount of the positive current is not equal to the current amount of the negative current.

Abstract: A charging method includes calculating a remained lifetime of a battery unit based on a health state and a battery temperature of the battery unit, charging the battery unit by a charging voltage with a first potential when the remained lifetime is higher than a lifetime threshold, and charging the battery unit by the charging voltage with a second potential when the remained lifetime is smaller than or equal to the lifetime threshold.

Abstract: A charging method includes calculating a remained lifetime of a battery unit based on a health state and a battery temperature of the battery unit, charging the battery unit by a charging voltage with a first potential when the remained lifetime is higher than a lifetime threshold, and charging the battery unit by the charging voltage with a second potential when the remained lifetime is smaller than or equal to the lifetime threshold.

Abstract: A dynamic cypher authentication system is applied to an electronic device having an authentication password. The system includes an input module, a password triggering module, an operation module, and an authentication module. The input module receives an operator password input by a user. The password triggering module generates a trigger signal and then generates a prompt password according to the trigger signal. The operation module performs a mathematical operation on the prompt password according to the operator password, so as to generate the authentication password. The authentication module receives a login password and compares the login password with the authentication password, so as to determine whether to authorize a login request on the electronic device.