Abstract: Disclosed is an electric power system including a first unit (for example, a unit 201) equipped with a first power source (for example, a solar panel (201b)), a first rechargeable battery (for example, a unit storage battery (201c)) to which an output of the first power source is input, and a first power consuming portion (not shown) to which an output of the first rechargeable battery is input; a second rechargeable battery (for example, a shared storage battery (202)); and an electric power line (for example, a shared electric power line (203)) for sharing electric power between the first rechargeable battery and the second rechargeable battery.

Abstract: A switching rectifier circuit according to the present invention includes: a first switch coupled between a first alternating-current voltage and a direct-current voltage; a second switch coupled between a second alternating-current voltage and the direct-current voltage; a third switch coupled between the first alternating-current voltage and a reference voltage; a fourth switch coupled between the second alternating-current voltage and the reference voltage; a first comparator circuit that generates each of a first power-on detection signal and a first power-off detection signal from the first alternating-current voltage and the direct-current voltage; a second comparator circuit that generates each of a second power-on detection signal and a second power-off detection signal from the second alternating-current voltage and the direct-current voltage; and a timing generator that controls the switches to be turned on/off on the basis of outputs of at least the comparator circuits.

Abstract: A switching rectifier circuit according to the present invention includes: a first switch coupled between a first alternating-current voltage and a direct-current voltage; a second switch coupled between a second alternating-current voltage and the direct-current voltage; a third switch coupled between the first alternating-current voltage and a reference voltage; a fourth switch coupled between the second alternating-current voltage and the reference voltage; a first comparator circuit that generates each of a first power-on detection signal and a first power-off detection signal from the first alternating-current voltage and the direct-current voltage; a second comparator circuit that generates each of a second power-on detection signal and a second power-off detection signal from the second alternating-current voltage and the direct-current voltage; and a timing generator that controls the switches to be turned on/off on the basis of outputs of at least the comparator circuits.

Abstract: A load driving circuit includes a first transistor and a second transistor that are bipolar transistors connected in series between a first fixed voltage (Vdd) and a second fixed voltage (GND), and supplies a drive current, according to ON-OFF states of the two transistors, to a load connected to an output terminal that is a connection point of the two transistors. A current source controls a base current supplying the first transistor. A protection circuit compares output voltage of the output terminal with a predetermined threshold voltage, and additionally monitors ON and OFF states of the first transistor. In a state in which Vout<Vth, and the first transistor is ON, the protection circuit reduces the base current of the first transistor.

Abstract: Disclosed is an electric power system including a first unit (for example, a unit 201) equipped with a first power source (for example, a solar panel (201b)), a first rechargeable battery (for example, a unit storage battery (201c)) to which an output of the first power source is input, and a first power consuming portion (not shown) to which an output of the first rechargeable battery is input; a second rechargeable battery (for example, a shared storage battery (202)); and an electric power line (for example, a shared electric power line (203)) for sharing electric power between the first rechargeable battery and the second rechargeable battery.

Abstract: A driver IC 1 has a bias terminal 20a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20b via which a bias voltage fed from a DSP 3 to drive and control a focus coil 5, a tracking coil 6, a sled motor 7, and a spindle motor 8 is fed in.

Abstract: A writing apparatus includes a reading unit that reads, from a paper sheet having plural labels embedded with wireless IC elements, each including a wireless communication unit and a storage unit storing data that is transmitted and received via the wireless communication unit, identification information to identify a set of pieces of information to be written respectively into the plural wireless IC elements; an acquisition unit that acquires a set of pieces of information to be written respectively into the plural wireless IC elements, based on the identification information read by the reading unit; and plural writing components that are provided corresponding to the plural wireless IC elements and write plural pieces of information to be written acquired by the acquisition unit into the plural wireless IC elements, respectively.

Abstract: The wireless tag processing apparatus is provided with: a transportation unit that transports a medium holding plural wireless tags; and a plurality of at least selected ones from writing units and reading units arranged so as to perform at least any one of an operation to write information with respect to each of the plural wireless tags in the medium transported by the transportation unit, and an operation to read information from each of the plural wireless tags.

Abstract: A load driving circuit includes a first transistor and a second transistor that are bipolar transistors connected in series between a first fixed voltage (Vdd) and a second fixed voltage (GND), and supplies a drive current, according to ON-OFF states of the two transistors, to a load connected to an output terminal that is a connection point of the two transistors. A current source controls a base current supplying the first transistor. A protection circuit compares output voltage of the output terminal with a predetermined threshold voltage, and additionally monitors ON and OFF states of the first transistor. In a state in which Vout<Vth, and the first transistor is ON, the protection circuit reduces the base current of the first transistor.

Abstract: A driver IC 1 has a bias terminal 20a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20b via which a bias voltage fed from a DSP 3 to drive and control a focus coil 5, a tracking coil 6, a sled motor 7, and a spindle motor 8 is fed in.

Abstract: By voltage limiting means, which provided in an IC as one of the components of an electronic apparatus, and a resistor, which is provided between a voltage input terminal of the IC and an external terminal of the electronic apparatus, an unexpected abnormal voltage generated in a DC power source such as an AC adaptor can be limited, and an overvoltage of not less than a predetermined value can be also prevented from being applied to the IC.

Abstract: A driver IC 1 has a bias terminal 20a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20b via which a bias voltage fed from a DSP 3 to drive and control a focus coil 5, a tracking coil 6, a sled motor 7, and a spindle motor 8 is fed in.

Abstract: A power supply apparatus is provided in the exemplary embodiments. The voltage generation circuit has a switching element. The control circuit controls a switching operation of the switching element. The voltage comparator compares an output voltage from the voltage generation circuit with a predetermined test voltage. The timer circuit is activated, when the output voltage from the voltage generation circuit is lower than the test voltage, and then measures elapsed time. The control circuit stops the switching operation of the switching element when the elapsed time measured by the timer circuit has exceeded a predetermined period of time.

Abstract: In a step-up/step-down DC-DC converter, an error signal commensurate with a difference between a voltage commensurate with the output voltage and a predetermined reference voltage and a triangular wave signal are compared by a first comparator, whose output is used to turn on and off a step-up switching circuit. An inverted signal obtained by inverting the error signal and the triangular wave signal are compared by a second comparator, whose output is used to turn on and off a step-down switching circuit. The median level between the outputs of the first and second comparators is set to be lower than the maximum level of the triangular wave signal and higher than the minimum level thereof. Thus, when step-up and step-down modes are switched from one to the other, an overlap period is produced during which the step-up and step-down modes overlap. This makes possible smooth switching between the step-up and step-down modes.

Abstract: In a step-up/step-down DC-DC converter, an error signal commensurate with a difference between a voltage commensurate with the output voltage and a predetermined reference voltage and a triangular wave signal are compared by a first comparator, whose output is used to turn on and off a step-up switching circuit. An inverted signal obtained by inverting the error signal and the triangular wave signal are compared by a second comparator, whose output is used to turn on and off a step-down switching circuit. The median level between the outputs of the first and second comparators is set to be lower than the maximum level of the triangular wave signal and higher than the minimum level thereof. Thus, when step-up and step-down modes are switched from one to the other, an overlap period is produced during which the step-up and step-down modes overlap. This makes possible smooth switching between the step-up and step-down modes.

Abstract: A driver IC 1 has a bias terminal 20a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20b via which a bias voltage fed from a DSP 3 to drive and control a focus coil 5, a tracking coil 6, a sled motor 7, and a spindle motor 8 is fed in.

Abstract: By voltage limiting means, which provided in an IC as one of the components of an electronic apparatus, and a resistor, which is provided between a voltage input terminal of the IC and an external terminal of the electronic apparatus, an unexpected abnormal voltage generated in a DC power source such as an AC adaptor can be limited, and an overvoltage of not less than a predetermined value can be also prevented from being applied to the IC.