Abstract: According to one embodiment, an electric power supply system includes a processor, a power circuit and an embedded controller. The processor includes a first controller configured to modify an operating frequency of the processor and a second controller configured to modify an operating power of the processor. The power circuit and the embedded controller detect a presence or an absence of a battery in parallel. The power circuit instructs the first controller to modify the operating frequency when removal of the battery is detected. The embedded controller causes the second controller to modify the operating power via a Basic Input/Output System (BIOS) when the removal of the battery is detected, and causes the first controller to stop modify the operating power via the power circuit.

Abstract: According to one embodiment, an electric power supply system includes a processor, a power circuit and an embedded controller. The processor includes a first controller configured to modify an operating frequency of the processor and a second controller configured to modify an operating power of the processor. The power circuit and the embedded controller detect a presence or an absence of a battery in parallel. The power circuit instructs the first controller to modify the operating frequency when removal of the battery is detected. The embedded controller causes the second controller to modify the operating power via a Basic Input/Output System (BIOS) when the removal of the battery is detected, and causes the first controller to stop modify the operating power via the power circuit.

Abstract: According to one embodiment, an electric power supply system includes a processor, a power circuit and an embedded controller. The processor includes a first controller configured to modify an operating frequency of the processor and a second controller configured to modify an operating power of the processor. The power circuit and the embedded controller detect a presence or an absence of a battery in parallel. The power circuit instructs the first controller to modify the operating frequency when removal of the battery is detected. The embedded controller causes the second controller to modify the operating power via a Basic Input/Output System (BIOS) when the removal of the battery is detected, and causes the first controller to stop modify the operating power via the power circuit.

Abstract: According to one embodiment, an electric power supply system includes a processor, a power circuit and an embedded controller. The processor includes a first controller configured to modify an operating frequency of the processor and a second controller configured to modify an operating power of the processor. The power circuit and the embedded controller detect a presence or an absence of a battery in parallel. The power circuit instructs the first controller to modify the operating frequency when removal of the battery is detected. The embedded controller causes the second controller to modify the operating power via a Basic Input/Output System (BIOS) when the removal of the battery is detected, and causes the first controller to stop modify the operating power via the power circuit.

Abstract: According to one embodiment, an electric power supply system includes a processor, a power circuit and an embedded controller. The processor includes a first controller configured to modify an operating frequency of the processor and a second controller configured to modify an operating power of the processor. The power circuit and the embedded controller detect a presence or an absence of a battery in parallel. The power circuit instructs the first controller to modify the operating frequency when removal of the battery is detected. The embedded controller causes the second controller to modify the operating power via a Basic Input/Output System (BIOS) when the removal of the battery is detected, and causes the first controller to stop modify the operating power via the power circuit.

Abstract: According to one embodiment, a system includes an electronic device and an extension device. The electronic device includes a first connector to which a first AC adapter is connected, a first control IC including a first power supply controller, and a first charger IC to charge a first battery with power from the first AC adapter in response to an instruction from the first power supply controller. The extension device includes a second connector to which a second AC adapter is connected, a second control IC including a second power supply controller, and a second charger IC to charge a second battery with power from the second AC adapter in response to an instruction from the second power supply controller.

Abstract: According to one embodiment, a system includes an electronic device and an extension device to which the electronic device is detachable from and attachable. The electronic device includes a first battery, and a voltage step-down circuit to charge the first battery with first power supplied from the extension device after stepping down or without stepping down voltage of the first power. The extension device includes a second battery, and a voltage step-up circuit to supply the electronic device with second power supplied from the second battery after stepping up or without stepping up voltage of the second power.

Abstract: According to one embodiment, an electronic apparatus connectable to an external apparatus includes a first connector and a detector. The first connecter is electrically connected to a second connector of the external apparatus. Each of the first connector and the second connecter includes a plurality of terminals. The detector is configured to detect a state of a first terminal of the first connector. The first terminal of the first connector is configured to be set to a predetermined state via at least a connection line connecting two terminals of the second connector to each other while the first connector and the second connector are electrically connected to each other.

Abstract: According to one embodiment, a system includes an electronic device and an extension device to which the electronic device is detachable from and attachable. The electronic device includes a first battery, and a voltage step-down circuit to charge the first battery with first power supplied from the extension device after stepping down or without stepping down voltage of the first power. The extension device includes a second battery, and a voltage step-up circuit to supply the electronic device with second power supplied from the second battery after stepping up or without stepping up voltage of the second power.

Abstract: According to one embodiment, a system includes an electronic device and an extension device. The electronic device includes a first connector to which a first AC adapter is connected, a first control IC including a first power supply controller, and a first charger IC to charge a first battery with power from the first AC adapter in response to an instruction from the first power supply controller. The extension device includes a second connector to which a second AC adapter is connected, a second control IC including a second power supply controller, and a second charger IC to charge a second battery with power from the second AC adapter in response to an instruction from the second power supply controller.

Abstract: According to one embodiment, an electronic apparatus connectable to an external apparatus includes a first connector and a detector. The first connecter is electrically connected to a second connector of the external apparatus. Each of the first connector and the second connecter includes a plurality of terminals. The detector is configured to detect a state of a first terminal of the first connector. The first terminal of the first connector is configured to be set to a predetermined state via at least a connection line connecting two terminals of the second connector to each other while the first connector and the second connector are electrically connected to each other.

Abstract: According to one embodiment, a battery stack includes a plurality of battery cells connected in series. A first battery terminal is electrically connected to a positive electrode of a topmost battery cell in the battery stack. Through the first battery terminal, first power is supplied from the battery stack to a host. A first switch selects a highest-voltage battery cell from the plurality of battery cells. A feed circuit supplies second power to a controller in a battery or a first device in the host by using a charge of the selected battery cell.

Abstract: A converter power supply circuit 100 includes SW_Q1 and SW_Q2 which switch a voltage inputted from an alternating power supply 101 via a full-wave rectifier 102 and a low-pass filter 103, by drive signals applied thereto and generate an output signal; an output current detecting unit 114 which detects a current value of the output signal to a load 113; a memory 118 in which prescribed values for changing the switching operation modes of the SW_Q1 and SW_Q2 are set; and a drive circuit 116 and a control circuit 115 which detect switching currents of the SW_Q1 and SW_Q2 and continuously change the operation state of the SW_Q1 and SW_Q2 from a high power consumption state to a low power consumption state according to a comparison result of the values of the detected currents to the prescribed values in the memory 118.

Abstract: According to one embodiment, the switching power supply device comprises a DC-DC converter, an alternating current driver circuit, a smoothing capacitor and control circuitry. The control circuitry operates for adjusting a phase of an oscillation signal from the alternating current driver circuit to coincide start time points of current conducting periods between the output stage of the DC-DC converter and an input stage of the alternating current driver circuit.

Abstract: According to one embodiment, the switching power supply device comprises a DC-DC converter, an alternating current driver circuit, a smoothing capacitor and control circuitry. The control circuitry operates for adjusting a phase of an oscillation signal from the alternating current driver circuit to coincide start time points of current conducting periods between the output stage of the DC-DC converter and an input stage of the alternating current driver circuit.

Abstract: A surge voltage detection circuit compares a stipulated voltage VS with the drain voltage of a switching element, the drain voltage being applied by a smoothing capacitor. The comparison result is supplied to a switching control circuit. If the drain voltage of the switching element is higher than the stipulated voltage VS, the switching control circuit inhibits the operation of the switching element. As a result, no switching operation is started, and the drain voltage of the switching element does not exceed the breakdown voltage of the element.

Abstract: A surge voltage detection circuit compares a stipulated voltage VS with the drain voltage of a switching element, the drain voltage being applied by a smoothing capacitor. The comparison result is supplied to a switching control circuit. If the drain voltage of the switching element is higher than the stipulated voltage VS, the switching control circuit inhibits the operation of the switching element. As a result, no switching operation is started, and the drain voltage of the switching element does not exceed the breakdown voltage of the element.

Abstract: A cable television system includes security means. A security sensor is provided a subscriber's house and when it generates an emergency signal a transmission path is formed by non-active elements from the security sensor to a trunk cable. An external control unit has a checking function of a power supplying state to the security sensor. The external control unit can communicate with a central station with respect to power source conditions of subscribers.

Abstract: A variable frequency oscillator includes a RAM which stores a frequency setting data and provides a frequency control data, a VCO circuit which provides an oscillation output having a frequency which is defined by the contents of the frequency control data, a reference oscillator which provides a reference signal having a given frequency and phase, a phase comparator which detects the phase difference between the reference signal and a comparison signal corresponding to the oscillation output, and a logic circuit which combines the frequency control data with a phase data and provides the frequency setting data. The phase comparator provides the phase data whose contents indicate +1 if the phase of the comparison signal is delayed from the phase of the reference signal, indicate -1 if the phase of the comparison signal is advanced to the phase of the reference signal, and indicate 0 if the phase of the comparison signal matches with the phase of the reference signal.