Abstract: A transformer less battery charger system. In one embodiment, the battery charger system includes input terminals for receiving an AC voltage, output terminals for receiving terminals of a rechargeable battery pack, and a non-isolated DC-DC converter coupled between the input terminals and the output terminals. A device is also coupled somewhere between the input terminals and the output terminals. The device is configured to selectively and indirectly couple the input terminals to the output terminals. More particularly, the device indirectly couples the input terminals to the output terminals when the rechargeable battery pack terminals are received by the output terminals, and the device indirectly decouples the input terminals from the output terminals when the rechargeable battery pack terminals are separated from the output terminals.

Abstract: A transformer less battery charger system. In one embodiment, the battery charger system includes input terminals for receiving an AC voltage, output terminals for receiving terminals of a rechargeable battery pack, and a non-isolated DC-DC converter coupled between the input terminals and the output terminals. A device is also coupled somewhere between the input terminals and the output terminals. The device is configured to selectively and indirectly couple the input terminals to the output terminals. More particularly, the device indirectly couples the input terminals to the output terminals when the rechargeable battery pack terminals are received by the output terminals, and the device indirectly decouples the input terminals from the output terminals when the rechargeable battery pack terminals are separated from the output terminals.

Abstract: A transformer less battery charger system. In one embodiment, the battery charger system includes input terminals for receiving an AC voltage, output terminals for receiving terminals of a rechargeable battery pack, and a non-isolated DC-DC converter coupled between the input terminals and the output terminals. A device is also coupled somewhere between the input terminals and the output terminals. The device is configured to selectively and indirectly couple the input terminals to the output terminals. More particularly, the device indirectly couples the input terminals to the output terminals when the rechargeable battery pack terminals are received by the output terminals, and the device indirectly decouples the input terminals from the output terminals when the rechargeable battery pack terminals are separated from the output terminals.

Abstract: A transformer less battery charger system. In one embodiment, the battery charger system includes input terminals for receiving an AC voltage, output terminals for receiving terminals of a rechargeable battery pack, and a non-isolated DC-DC converter coupled between the input terminals and the output terminals. A device is also coupled somewhere between the input terminals and the output terminals. The device is configured to selectively and indirectly couple the input terminals to the output terminals. More particularly, the device indirectly couples the input terminals to the output terminals when the rechargeable battery pack terminals are received by the output terminals, and the device indirectly decouples the input terminals from the output terminals when the rechargeable battery pack terminals are separated from the output terminals.

Abstract: There are provided a golf ball in which the depths of dimples after grinding, which greatly affect the trajectory of golf ball, can be controlled readily and exactly, and a golf ball molding die for manufacturing the golf ball. The golf ball molding die in accordance with the present invention comprises two die bodies in which a cavity for molding a golf ball is formed by joining the die bodies to each other; and a protrusion formed on the cavity side surface of at least one of the die bodies, the protrusion having a uniform height from the surface or an imaginary spherical surface on which the protrusion is assumed to be absent toward the center of the cavity, wherein when a parting line is at latitude zero degree, the protrusion is arranged in the range of from latitude about 10 degrees to latitude about 80 degrees.

Abstract: The size of a light emitting device is reduced. The light emitting device for flash photography includes: a luminescent xenon tube; IGBT for the discharge switch of the xenon tube; a capacitor for discharging the xenon tube; and MOSFET for the charge switch of the capacitor. A semiconductor device used in this light emitting device is obtained by sealing the following in a package: a semiconductor chip in which the IGBT is formed; a semiconductor chip in which the MOSFET is formed; a semiconductor chip in which a drive circuit of the IGBT and a control circuit of the MOSFET are formed; and multiple leads coupled thereto.

Abstract: There are provided a golf ball in which the depths of dimples after grinding, which greatly affect the trajectory of golf ball, can be controlled readily and exactly, and a golf ball molding die for manufacturing the golf ball. The golf ball molding die in accordance with the present invention comprises two die bodies in which a cavity for molding a golf ball is formed by joining the die bodies to each other; and a protrusion formed on the cavity side surface of at least one of the die bodies, the protrusion having a uniform height from the surface or an imaginary spherical surface on which the protrusion is assumed to be absent toward the center of the cavity, wherein when a parting line is at latitude zero degree, the protrusion is arranged in the range of from latitude about 10 degrees to latitude about 80 degrees.

Abstract: There are provided a golf ball in which the depths of dimples after grinding, which greatly affect the trajectory of golf ball, can be controlled readily and exactly, and a golf ball molding die for manufacturing the golf ball. The golf ball molding die in accordance with the present invention comprises two die bodies in which a cavity for molding a golf ball is formed by joining the die bodies to each other; and a protrusion formed on the cavity side surface of at least one of the die bodies, the protrusion having a uniform height from the surface or an imaginary spherical surface on which the protrusion is assumed to be absent toward the center of the cavity, wherein when a parting line is at latitude zero degree, the protrusion is arranged in the range of from latitude about 10 degrees to latitude about 80 degrees.

Abstract: To provide a new switching amplifier in which power supply switching noise is reduced to improve the quality. The switching amplifier is provided with a power amplifier (1) that has a modulator which modulates an analog signal or a multi bit digital signal into a two-level signal, and supplies an output pulse signal from this modulator to a power switching element (3); and a &Dgr;&Sgr; power supply (5) which is provided with a &Dgr;&Sgr; modulating device, and the construction is such that the output pulse signal from the modulator of the power amplifier (1) is supplied to the &Dgr;&Sgr; power supply (5), and also the construction is such that the &Dgr;&Sgr; power supply (5) receives the pulse signal as an operating clock, &Dgr;&Sgr; modulates the received pulse signal, and supplies the &Dgr;&Sgr; modulated pulse signal to the power switching element (3).

Abstract: A switching signal generator for a switching power supply employing a DC-DC modulator has an adder, an integrator and a quantizer. A gate driver circuit is provided upstream of a power switch element and receives a quantizer output. By feeding back a gate driver circuit output to the adder of the &Dgr;&Sgr;-modulator, a large phase margin is obtained at a high-frequency switching. The switching signal generator for the &Dgr;&Sgr;-modulation type switching power supply has an improved direct-current transmission linearity characteristic relative to direct-current input, and that is stably controllable and of high efficiency. Furthermore, a DC-DC converter has an adder, an integrator and a quantizer, the integrator having a mechanism for adjusting its gain.

Abstract: To provide a new switching amplifier in which power supply switching noise is reduced to improve the quality. The switching amplifier is provided with a power amplifier (1) that has a modulator which modulates an analog signal or a multi bit digital signal into a two-level signal, and supplies an output pulse signal from this modulator to a power switching element (3); and a &Dgr;&Sgr; power supply (5) which is provided with a &Dgr;&Sgr; modulating device, and the construction is such that the output pulse signal from the modulator of the power amplifier (1) is supplied to the &Dgr;&Sgr; power supply (5), and also the construction is such that the &Dgr;&Sgr; power supply (5) receives the pulse signal as an operating clock, &Dgr;&Sgr; modulates the received pulse signal, and supplies the &Dgr;&Sgr; modulated pulse signal to the power switching element (3).

Abstract: A switching signal generator for a switching power supply employing a DC-DC modulator has an adder, an integrator and a quantizer. A gate driver circuit is provided upstream of a power switch element and receives a quantizer output. By feeding back a gate driver circuit output to the adder of the &Dgr; &Sgr;-modulator, a large phase margin is obtained at a high-frequency switching. The switching signal generator for the &Dgr; &Sgr;-modulation type switching power supply has an improved direct-current transmission linearity characteristic relative to direct-current input, and that is stably controllable and of high efficiency. Furthermore, a DC-DC converter has an adder, an integrator and a quantizer, the integrator having a mechanism for adjusting its gain.

Abstract: A switching signal generator for a switching power supply employing a DC-DC modulator has an adder, an integrator and a quantizer. A gate driver circuit is provided upstream of a power switch element and receives a quantizer output. By feeding back a gate driver circuit output to the adder of the &Dgr;&Sgr;-modulator, a large phase margin is obtained at a high-frequency switching. The switching signal generator for the &Dgr;&Sgr;-modulation type switching power supply has an improved direct-current transmission linearity characteristic relative to direct-current input, and that is stably controllable and of high efficiency. Furthermore, a DC-DC converter has an adder, an integrator and a quantizer, the integrator having a mechanism for adjusting its gain.

Abstract: The present invention provides a switching power supply capable of limiting power supply output power with a method compatible with reduced size regardless of the modulation system. The present invention is able to provide a compact switching power supply that enables the amount of limitation of power supply output power to be regulated as desired with little inrush current and overshoot particularly in the case of adapting to power supply soft starting by providing a reset device between a switching signal generation device and switching element, applying a reset pulse signal to reset device, and changing the duty of the above reset pulse signal between 0% and 100%.

Abstract: The present invention provides a stable, highly efficient DC-DC converter that uses &Dgr;&Sgr; modulation capable of limiting excessive peak current flowing inside the converter by monitoring the current flowing inside the converter with an integrator located inside the &Dgr;&Sgr; modulator. A highly efficient &Dgr;&Sgr; modulation type of DC-DC converter can be provided capable of stable control without requiring a detection resistor by composing the &Dgr;&Sgr; modulator with an adder, integrator, quantizer and attenuator, providing an AND circuit that limits the on period of the output signal of a power switching element, and limiting the excessive peak current flowing within the converter.

Abstract: The present invention provides a switching power supply capable of limiting power supply output power with a method compatible with reduced size regardless of the modulation system. The present invention is able to provide a compact switching power supply that enables the amount of limitation of power supply output power to be regulated as desired with little inrush current and overshoot particularly in the case of adapting to power supply soft starting by providing a reset device between a switching signal generation device and switching element, applying a reset pulse signal to reset device, and changing the duty of the above reset pulse signal between 0% and 100%.

Abstract: The present invention provides a stable, highly efficient DC-DC converter that uses &Dgr;&Sgr; modulation capable of limiting excessive peak current flowing inside the converter by monitoring the current flowing inside the converter with an integrator located inside the &Dgr;&Sgr; modulator.

Abstract: A switching signal generator for a switching power supply employing a DC-DC modulator has an adder, an integrator and a quantizer. A gate driver circuit is provided upstream of a power switch element and receives a quantizer output. By feeding back a gate driver circuit output to the adder of the &Dgr;&Sgr;-modulator, a large phase margin is obtained at a high-frequency switching. The switching signal generator for the &Dgr;&Sgr;-modulation type switching power supply has an improved direct-current transmission linearity characteristic relative to direct-current input, and that is stably controllable and of high efficiency. Furthermore, a DC-DC converter has an adder, an integrator and a quantizer, the integrator having a mechanism for adjusting its gain.