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 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 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 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 power supply system to provide power for a central processing unit (CPU) includes a bridge circuit, a pulse width modulation (PWM) controller and a pulse adjusting driver circuit. The bridge circuit detects a work state of the PWM controller to obtain a feedback signal output from the PWM controller, and provides the feedback signal to the CPU. The CPU outputs a control signal to the bridge circuit according to a work state of the CPU and the feedback signal, and the bridge circuit outputs a PWM signal to the pulse adjusting driver circuit according to the control signal. The pulse adjusting driver circuit receives a first driving signal provided by an external circuit, and adjusts the first driving signal according to the PWM signal to generate at least one second driving signal to drive the CPU.

Abstract: A voltage converter includes a driver, a subsidiary voltage converter, an inductor, a capacitor, and a voltage detection unit. The subsidiary voltage converter generates a driving voltage transmitted to the driver to supply working power to the driver. The driver controls the capacitor to be alternately charged and discharged through the inductor, thereby generating an output voltage and output current between the inductor and the first capacitor. The voltage detection unit detects an electric potential difference of the inductor and generates a reference voltage according to the electric potential difference, and the subsidiary voltage converter receives the reference voltage and adjusts the driving voltage according to the reference voltage.

Abstract: A battery control circuit includes an electronic switch, first and second diodes, and first and second batteries. A positive terminal of the first battery is connected to a positive terminal of the second battery through the first diode. A negative terminal of the first battery is connected to a positive terminal of the second battery through the electronic switch, and connected to a negative terminal of the second battery through the second diode. When the electronic switch receives a first control signal, the electronic switch is turned on, the first and second diodes are turned off, and the first and second batteries are connected in series. When the electronic switch receives a second control signal, the electronic switch is turned off, the first and second diodes are turned on, and the first and second batteries are connected in parallel.

Abstract: An application burning device and at least one power PWM controller are mounted on a main board. The device includes a processor and a storage unit storing applications to be burned to the at least one power PWM controller. The processor determines whether there is a power PWM controller not burned yet, and burns a corresponding application to the controller. A related application burning method is also provided.

Abstract: A power supply system to provide power for a central processing unit (CPU) includes a bridge circuit, a pulse width modulation (PWM) controller and a pulse adjusting driver circuit. The bridge circuit detects a work state of the PWM controller to obtain a feedback signal output from the PWM controller, and provides the feedback signal to the CPU. The CPU outputs a control signal to the bridge circuit according to a work state of the CPU and the feedback signal, and the bridge circuit outputs a PWM signal to the pulse adjusting driver circuit according to the control signal. The pulse adjusting driver circuit receives a first driving signal provided by an external circuit, and adjusts the first driving signal according to the PWM signal to generate at least one second driving signal to drive the CPU.

Abstract: A digital pulse width modulation (PWM) controller is used for controlling the operating voltage of an electrical load and includes a setting module, a storage module and a control module. The setting module generates control parameters corresponding to different preset load currents and load voltages of the electrical load. The storage module stores the control parameters and the prestored load current and load voltage. The control module is in electronic communication with the storage module, and detects current load voltage and current load current of the electrical load, and compares the current load voltage and load current with the prestored load voltage. Thus, the control module can output the control parameters which are necessary to stabilize the operating voltage of the electrical load, by comparison with stored data.

Abstract: A voltage converter includes a driver, a subsidiary voltage converter, an inductor, a capacitor, and a voltage detection unit. The subsidiary voltage converter generates a driving voltage transmitted to the driver to supply working power to the driver. The driver controls the capacitor to be alternately charged and discharged through the inductor, thereby generating an output voltage and output current between the inductor and the first capacitor. The voltage detection unit detects an electric potential difference of the inductor and generates a reference voltage according to the electric potential difference, and the subsidiary voltage converter receives the reference voltage and adjusts the driving voltage according to the reference voltage.

Abstract: A battery control circuit includes an electronic switch, first and second diodes, and first and second batteries. A positive terminal of the first battery is connected to a positive terminal of the second battery through the first diode. A negative terminal of the first battery is connected to a positive terminal of the second battery through the electronic switch, and connected to a negative terminal of the second battery through the second diode. When the electronic switch receives a first control signal, the electronic switch is turned on, the first and second diodes are turned off, and the first and second batteries are connected in series. When the electronic switch receives a second control signal, the electronic switch is turned off, the first and second diodes are turned on, and the first and second batteries are connected in parallel.

Abstract: A power adapter for an electronic device selectively works in different modes according to a working state signal of the electronic device. When the electronic device is powered off or on with a battery in a determined charge state, the power adapter controls a relay to turn off the relay to disconnect power to the electronic device.

Abstract: A multi-phase driving circuit includes a single-phase pulse-width modulation (PWM) controller, a number of drivers, and a number of switch circuits connected to the number of drivers correspondingly. The single-phase PWM controller is configured for providing a single-phase PWM signal. Each of the number of drivers receives the single-phase PWM signal and adjusts a phase of the single-phase PWM signal to output an adjusted PWM signal. Each of the number of drivers also outputs a driving signal. Each of the number of switch circuits receives the adjusted PWM signal and the driving signal from a driver. Each of the number of switch circuits generates a driving voltage controlled by the driving signal and adjusts a phase of the driving voltage controlled by the adjusted PWM signal and then outputs the adjusted driving voltage, so as to make the number of switch circuits output a multi-phase driving voltage to a load.

Abstract: A control circuit for a switching power supply (SPS) includes power input and output interfaces, a relay, a relay driving circuit, a microprocessor, and an alternating current/directing current (AC/DC) converter. The power input interface receives an external alternating current (AC) power signal, and transmits the AC power signal to the SPS via the power output interface. The AC/DC converter transforms the AC power signal into a direct current (DC) power signal to supply for the relay, the relay driving circuit, and the microprocessor. When a computer is turned on, the microprocessor sends a first control signal to control the relay driving circuit to drive the relay to connect the power input and output interfaces. When the computer is turned off, the microprocessor sends a second control signal to control the relay driving circuit to drive the relay to cut off connection between the power input and output interfaces.

Abstract: A power supply saving system includes a power input interface, a power output interface, an alternating current/direct current (AC/DC) converter, a relay, a relay driving circuit, a trigger, and a timing sequence circuit. The AC/DC converter is capable of transforming the AC power signal to direct current (DC) power to supply to the relay, the relay driving circuit, the trigger, and the timing sequence circuit. The timing sequence circuit is capable of controlling the relay driving circuit via the trigger to turn on the relay to connect the power input interface to the power output interface when the timing sequence circuit receives a power-on signal. The timing sequence circuit is capable of controlling the relay driving circuit via the trigger to turn off the relay to cut off connection between the power input interface and the power output interface when the timing sequence circuit receives a power-off signal.

Abstract: A switching power supply saving system includes a power interface, a power converting circuit, a relay, a relay driving circuit, a trigger, and a timing sequence circuit. The power converting circuit is configured to receive the AC power from the power interface. The power converting circuit is capable of transforming the AC power to direct current (DC) power to supply to a motherboard. When the timing sequence circuit receives a power on signal, the timing sequence circuit is capable of controlling the relay driving circuit via the trigger to cause the relay to connect the power converting circuit to the power interface. When the timing sequence circuit receives a power off signal, the timing sequence circuit is capable of controlling the relay driving circuit via the trigger to cause the relay to cut off connection between the power converting circuit and the power interface.

Abstract: A power adapter for an electronic device selectively works in different modes according to a working state signal of the electronic device. When the electronic device is powered off or on with a battery in a determined charge state, the power adapter controls a relay to turn off the relay to disconnect power to the electronic device.

Abstract: A power switch circuit includes a connector connected to a power supply, a detecting circuit, a first switch circuit, and a first conversion circuit. The connector is connected to the detecting circuit and connected to a first power terminal of a motherboard. The connector is connected to a second power terminal of the motherboard via the first conversion circuit and the first switch circuit, the detecting circuit outputs a corresponding control signal according to a type of the power supply to turn the first switch circuit and the first conversion circuit on or off to supply power for the motherboard.

Abstract: A control circuit for a switching power supply (SPS) includes power input and output interfaces, a relay, a relay driving circuit, a microprocessor, and an alternating current/directing current (AC/DC) converter. The power input interface receives an external alternating current (AC) power signal, and transmits the AC power signal to the SPS via the power output interface. The AC/DC converter transforms the AC power signal into a direct current (DC) power signal to supply for the relay, the relay driving circuit, and the microprocessor. When a computer is turned on, the microprocessor sends a first control signal to control the relay driving circuit to drive the relay to connect the power input and output interfaces. When the computer is turned off, the microprocessor sends a second control signal to control the relay driving circuit to drive the relay to cut off connection between the power input and output interfaces.