Abstract: A power supply switch apparatus includes a first interface, a switch circuit, and a power supply circuit. The first interface includes a first control signal output terminal, a second control signal output terminal, and a third control signal output terminal. Each of the first control signal output terminal, the second control signal output terminal, and the third control signal output terminal outputs a control signal according to an electronic device inserted in the first interface. The switch circuit receives the control signals and outputs a power supply signal accordingly. The power supply circuit receives the power supply signal, and provides a first direct current (DC) voltage or a second DC voltage to the electronic device according to the power supply signal.

Abstract: A heating preservation system includes a selected unit, a control unit, a detection unit, and a heating unit. The selected unit is configured to select a preset temperature from amongst a plurality of differing preset temperatures, each preset temperature corresponds to a preset voltage. The control unit is configured to send out the preset voltage according to the selected preset temperature. The detection unit is configured to detect a temperature of fluid and convert the temperature to a detected voltage. The comparison unit is configured to receive the preset voltage and the detected voltage and compare the detected voltage with the preset voltage. The heating unit is configured to heat the fluid when the detected voltage is less than the preset voltage, and stop heating the fluid when the detected voltage is more than the preset voltage. A smart cup using the heating preservation system is further disclosed.

Abstract: A distance detection system in an electronic device includes a vibration prompt circuit and a prompt module. The vibration prompt circuit includes a distance sensor, a processor, and a comparison module. The distance sensor is coupled to the processor. The processor is coupled to the comparison module. The comparison module is coupled to the prompt module. The distance sensor sends a distance value as to the distance between itself and a detected object to the processor. The processor converts the distance value to a current value and the current value is compared with a reference value. The prompt module activates a vibration device if the current value is greater than the reference value. A vibration prompt circuit and a vibration prompt method are also provided.

Abstract: A connector leakage protection system includes a current foldback module with a first end coupled to an output port of a DC power supply; an anti-interference module with a first end coupled to a second end of the current foldback module, and a second end coupled to a power port of a connector; and a leakage protection module between the output port and the first end of the current foldback module, or the second end of the current foldback module and the first end of the anti-interference module, or the second end of the anti-interference module and the power port. When the output port outputs a DC voltage, the leakage protection module is switched on. When the output port does not output the DC voltage, the leakage protection module is switched off, preventing current leakage from flowing to the output port. A connector leakage protection circuit is also provided.

Abstract: A power supply system includes a power supply unit, a voltage converting unit, a comparison unit, and a switching unit. The power supply unit is configured to provide working voltage for a motherboard via a first resistor. The voltage converting unit includes a voltage converting chip. The voltage converting chip is configured to detect a first direct current (DC) voltage on the first resistor, and convert the first DC voltage to a second DC voltage. The comparison unit is configured to receive the second DC voltage, compare the second DC voltage with the working voltage, and output a switch signal. The switching unit is configured to receive the switch signal, and output a control signal to a central processing unit (CPU) on the motherboard according to the switch signal. The CPU is configured to adjust its frequency according to the control signal.

Abstract: A switching apparatus to adapt an interface for multi-functional use includes a signal source, a display unit, a control unit, and a connector. The signal source includes a first power output and a data output. The display unit includes a power input and a data input. The control unit includes a switching chip having a control signal input, a first data pin, a second data pin, and a third data pin. The connector includes a second power input, a second power output, and a data output. The control signal input receives a switching signal. When the second data pin communicates with the first data pin according to the switching signal, the first power output is electrically coupled to the second power input, the signal source provides power for an electronic device connected with the connector.

Abstract: An electronic device includes a motherboard that includes a south bridge, a universal serial bus (USB) 3.0 connector, and a ground module. The south bridge is connected to the USB3.0 connector for transporting USB3.0 signals and USB2.0 signals. The grounded module is connected to the south bridge and the USB3.0 connector. The south bridge is used for controlling the ground module to work. The USB2.0 signals transmit between the south bridge and the USB3.0 connector flow into the ground, while the ground module is working.

Abstract: A motherboard includes a power module, a display module, a control module, and a protection module. The protection module is coupled to the power module, the display module, and the control module. The control module is capable of outputting a first control signal to control the protection module to connect the power module to the display module to be powered by the power module or disconnect the power module from the display module.

Abstract: A charging circuit for a USB port includes a first connector, a second connector, and a voltage booster circuit. The first connector includes a first power pin. The second connector includes a second power pin. The voltage booster circuit is connected between the first connector and the second connector. The voltage booster boosts a voltage provided by the first power pin of the first connector and provides the boosted voltage to the second power pin of the second connector to charge an electronic device.

Abstract: An electronic device includes a platform controller hub and a charging interface. The charging interface includes a connector for coupling to a peripheral device, and a charging integrated circuit coupled to the connector. The connector includes an insert detecting member for detecting if the peripheral device is inserted. The charging integrated circuit can provide power to the connector. The platform controller hub can exchange data through the connector through the charging integrated circuit. The charging integrated circuit can cut off the power to the connector when the insert detecting member detects that no peripheral device is inserted in the connector.

Abstract: An alarm circuit for electronic device includes a detection unit, a signal conversion circuit, and an alarm control circuit. The detection unit is configured to detect a working status of an electronic device, and output a control signal of a first voltage level when the detection circuit determines the presence of smoke in the electronic device. The signal conversion circuit is configured to receive the control signal of the first voltage level, and convert the control signal of the first voltage level to an alarm signal of a first voltage level. The alarm control circuit is configured to receive the alarm signal of the first voltage level and transmit an alarm.

Abstract: A method for switching operating systems and an electronic apparatus are provided. A first operating system (OS) is notified to enter a power saving mode when a switching signal is received in case of running the first OS. In the power saving mode, a first running data of the first OS is stored to a first dump area of a storage unit from a system memory, a second OS is loaded to the system memory such that the second OS enters a normal operating mode.

Abstract: A framework for forming an electronic display includes a primary electronic device, at least one coupling electronic device, and at least one secondary electronic device. The primary electronic device includes a system on a chip electronically coupled to a display screen of the primary electronic device. The at least one coupling electronic and the at least one secondary electronic device each includes an integrated circuit and a corresponding display screen. Each electronic device includes at least one connector configured to electronically couple to the connector of another electronic device. The system on a chip of the primary electronic device controls the display screen of each of the electronic devices to display a portion of the electronic display.

Abstract: A DC power supply control system includes a voltage conversion module configured to couple to a DC power supply and convert a DC voltage to a power voltage; a power port coupled to the voltage conversion module and configured to be coupled to a peripheral load; a switch module coupled to the voltage conversion module and configured to switch on/off the voltage conversion module; and a detection module coupled to the power port and configured to detect the peripheral load. When the detection module detects the peripheral load, the switch module switches on the voltage conversion module, allowing the DC voltage to be converted to the power voltage. Without a peripheral load being detected by the detection module, the switch module switches off the voltage conversion module. A DC power supply control circuit is further disclosed.

Abstract: A rotational speed control system includes a fan controller and a fan controlling circuit. The fan controlling circuit is coupled to the fan controller. The fan controlling circuit can receive a rotational speed control signal and output a fan driving signal to the fan controller. The fan driving signal is a regulated high level voltage signal. The fan controller can adjust rotational speed of the fan according to the driving signal.

Abstract: An interface supply system includes a switching power supply, a control chip, and a control circuit. The control circuit is coupled to the switching power supply and the control chip. The switching power supply is configured to supply power to an interface. The control circuit is configured to be switched on and output a detection signal to the control chip when the switching power supply and the control chip are shorted. The control chip is configured to not supply power to the interface after receiving the detection signal.

Abstract: A charging circuit includes a power supply chipset, a charging port, and a detecting circuit. The power supply chipset includes an enable pin. A voltage on the enable pin controls the power supply chipset. The charging port includes a detecting pin which detects whether there is an electronic device connected on the charging port. The detecting circuit is connected between the detecting pin and the enable pin. The detecting circuit controls the voltage on the enable pin to cause the power supply chipset to output a charging voltage to the power supply chipset in event an electronic device that requires charging is connected to the charging port.

Abstract: A testing apparatus to establish a fault by a process of elimination includes an input unit, a signal converting unit, a switch unit, and a display unit. The input unit receives an input signal and outputs a switch signal. The signal converting unit receives the switch signal and outputs a control signal. The switch unit receives the control signal and outputs a test signal. The display unit receives the test signal and runs a built in self test (BIST) program to test the proper functioning of the display unit. The signal converting unit outputs a data signal and a clock signal to the display unit when the display unit works normally. The signal converting unit not output the data signal and the clock signal to the display unit when the input signal and resulting control signal are repeated.