Abstract: An electronic device capable of audio files with different formats includes a power supply, a switching circuit, an audio control module, an audio output module, and a detecting module. The power supply supplies a first voltage and a second voltage. The detecting module detects whether the format of the audio file is changed. The detecting module generates a first detecting signal within a first predetermined time period from a point in time when the format of the audio file is changed time point, and the switching circuit transmits the first voltage to the audio control module in response to the first detecting signal. The audio control module receives the second voltage and generates a first signal based on the first voltage and the second voltage. The audio output module is disabled from outputting audio signal of the audio file.

Abstract: An electronic device includes a main body, a cover, a pivot mechanism, a main circuit board received in the main body, and a sub-circuit board received in the cover. The pivot mechanism is conductive, the main circuit board comprises a grounded first conductive layer, the sub-circuit board comprise a grounded second conductive layer, the first conductive layer is connected to the second conductive layer.

Abstract: A touch device includes a touch panel, a circuit board, and at least one capacitive sensing element located between the touch panel and the circuit board. The circuit board includes a top layer and a bottom layer, each capacitive sensing element is mounted to the top layer, the bottom layer defines at least one first area, each first area corresponds to each capacitive sensing element, and each first area is not coated with copper.

Abstract: An electronic device powered by a voltage of a power supply includes a load, a switching module connected between the power supply and the load, and an overvoltage protection circuit. The overvoltage protection circuit comprises a control unit presetting a first predetermined voltage and an overvoltage protection unit. When the voltage is larger than the first predetermined voltage, the control unit generates a protection signal to control the overvoltage protection unit to generate a first control signal, the switching module cuts off an electrical connection between the power supply and the load in response to the first control signal.

Abstract: A power source includes a first power terminal for outputting a first supply voltage. A power management circuit includes a pulse width modulation unit having an input power terminal, a first switch unit capable of being turned on to establish an electrical connection between the first power terminal and the input power terminal or being turned off to cut off the electrical connection, a storage unit. The input power terminal receives the first supply voltage from the first power terminal when the first switch unit is turned on, the pulse width modulation unit is powered by the first supply voltage to generate a pulse voltage at the output terminal. The storage unit receives the first supply voltage to store energy when the pulse voltage is in a first level, and releases energy to generate an operating voltage for powering the load when the pulse voltage is in a second level.

Abstract: An exemplary charge indicator circuit indicates the state of charge of a battery. The charge indicator circuit includes a connection jack, an indicator module, a voltage detection module, a charger IC, and a path connection module. The indicator module includes an indicator. The indicator is on when the battery is being charged. The voltage detection module is to output a first response signal when the connection jack is connected to the power supply. The charger IC is to manage the charging of the battery, and output a low level signal when a condition of the battery is satisfied. The path connection module is in a shunt circuit of the indicator module, and enables the shunt circuit of the indicator module to cause the indicator to be on when the voltage detection module outputs the first response signal and the charger IC outputs the low level signal.

Abstract: An overvoltage protection circuit is arranged in an electronic device for providing a proper working voltage to the electronic device. The overvoltage protection circuit includes a first selecting circuit and a second selecting circuit connected in parallel to the first selecting circuit between a voltage input port and a voltage output port of the overvoltage protecting circuit. When an input voltage from the input port is less than a first value, the input voltage is output to the output port directly through the first selecting circuit, and when the input voltage is greater than the first value, the input voltage is output to the output port after the value of the input voltage is reduced through the second selecting circuit.

Abstract: A protection method is executed by an electronic device that is powered by a supply voltage of a power source. The protection method includes steps of: storing a power-off threshold voltage; detecting the supply voltage of the power source to generate a detecting voltage; determining whether the detecting voltage is equal to the power-off threshold voltage; beginning to count for a predetermined period of time when the detecting voltage is equal to the power-off threshold voltage and acquiring the detecting voltage during the predetermined period of time; determining whether each acquired detecting voltage is smaller than the power-off threshold voltage; and generating a first control signal when one of the acquired detecting voltages is larger than or is equal to the power-off threshold voltage; wherein the first control signal controls a processor of the electronic device to stop performing a power-off procedure.

Abstract: An overvoltage protection circuit includes a connection jack, a path connection module, a voltage response module, and a control module. The connection jack is connected to a power supply. The path connection module is connected between the connection jack and a load. The voltage response module is to output a first signal in response to an overvoltage, and output a second signal in response to a constant voltage. The control module is to output a corresponding potential according to the first signal to turn off the path connection module, and output a corresponding potential according to the second signal to turn on the path connection module. When the path connection module is turned off, the connection between the connection jack and the load is disabled, when the path connection module is turned on, the connection between the connection jack and the load is enabled.

Abstract: An overvoltage protection circuit includes a connection jack, a path connection module, a voltage response module, and a control module. The connection jack is connected to a power supply. The path connection module is connected between the connection jack and a load. The voltage response module is to output a first signal in response to an overvoltage, and output a second signal in response to a constant voltage. The control module is to output a corresponding potential according to the first signal to turn off the path connection module, and output a corresponding potential according to the second signal to turn on the path connection module. When the path connection module is turned off, the connection between the connection jack and the load is disabled, when the path connection module is turned on, the connection between the connection jack and the load is enabled.