Sony Corporation

Sony Mobile Communications Inc.

Sony Ericsson Mobile Communications Japan, Inc.

Kazuhito Tsuchida

Junji Saito

Kazuo Sudo

Kazuo Nakamura

Shiho Moriai

Atsushi Ozawa

Shinichi Uesaka

Masanobu Katagi

Shin Hotta

Tomoyuki Ono

Kentaro Marutani

Tsuyoshi Masato

Kimitaka Benise

A light emitting element drive apparatus capable of outputting the lowest voltage satisfying drive conditions and having high light emitting efficiency and low power loss, and a portable apparatus using the same, comprising an LED drive apparatus to which LEDs of different drive voltages required for emitting light are connected in parallel and driving one or more LEDs, wherein the LED drive apparatushas drive circuits connected to the corresponding LEDs among a plurality of LEDs and driving the corresponding LEDs with luminances based on set values and power supply circuits for deciding a drive voltage value required for the highest light emission among one or more LEDs driven to emit light based on drive states of drive circuits (for example terminal voltages of the current source) and supplying a drive voltage having at least the decided value to LEDs in parallel.

Light emitting element drive apparatus and portable apparatus using same

A power supply device including: (a) a power supply unit group composed of a plurality of power supply units and connected with a power consuming appliance; and (b) a control device configured to control the power supply unit group, wherein the control device and each of the power supply units are connected to each other by a communicating circuit.

Power supply device

A light emitting element drive apparatus capable of always outputting the lowest voltage satisfying the drive conditions and having a high light emitting efficiency and a low power loss, and a portable apparatus using the same, comprising an LED drive apparatusto which LEDs-to-of different drive voltages required for emitting light are connected in parallel and driving one or more LEDs, wherein the LED drive apparatushas drive circuits-to-connected to the corresponding LEDs among a plurality of LEDs and driving the corresponding LEDs with luminances based on set values and power supply circuitsandfor deciding a drive voltage value required for the highest light emission among one or more LEDs driven to emit light based on drive states of drive circuits (for example terminal voltages of the current source) and supplying a drive voltage having at least the decided value to a plurality of LEDs in parallel.

A light emitting element drive apparatus capable of outputting the lowest voltage satisfying drive conditions and having high light emitting efficiency and low power loss, and a portable apparatus using the same, comprising an LED drive apparatus to which LEDs of different drive voltages required for emitting light are connected in parallel and driving one or more LEDs, wherein the LED drive apparatus has drive circuits connected to the corresponding LEDs among a plurality of LEDs and driving the corresponding LEDs with luminances based on set values and power supply circuits for deciding a drive voltage value required for the highest light emission among one or more LEDs driven to emit light based on drive states of drive circuits (for example terminal voltages of the current source) and supplying a drive voltage having at least the decided value to LEDs in parallel.

A light emitting element drive apparatus capable of always outputting the lowest voltage satisfying the drive conditions and having a high light emitting efficiency and a low power loss, and a portable apparatus using the same, comprising a LED drive apparatusto which LEDs-to-n of different drive voltages required for emitting light are connected in parallel and driving one or more LEDs, wherein the LED drive apparatushas drive circuits-to-n connected to the corresponding LEDs among a plurality of LEDs and driving the corresponding LEDs with luminances based on set values and power supply circuitsandfor deciding a drive voltage value required for the highest light emission among one or more LEDs driven to emit light based on drive states of drive circuits (for example terminal voltages of the current source) and supplying a drive voltage having at least the decided value to a plurality of LEDs in parallel.

Light emitting element drive apparatus and portable apparatus using the same

A hysteresis detection method has two reference voltages Vref, Vrefrelative to an input voltage Vin. It is determined whether the input voltage Vin becomes higher than or lower than the reference voltages Vref, Vref, and a judged result is outputted. In the initial stage in which the detection is started, regardless of the magnitude of the input voltage Vin, the reference voltage is fixed to any one of the reference voltages Vref, Vref. There are provided a hysteresis detecting method and a hysteresis detecting circuit in which, in the hysteresis detection having two reference voltages and which determines whether the input voltage is higher than or lower than the two reference voltages, one of the reference voltages can be judged and the judged result can be outputted regardless of the magnitude of the input voltage in the initial state in which the reference voltage is stabilized from the time in which the circuit is actuated. Also, there is provided a mobile device using this hysteresis detecting circuit.

Growing community of inventors

Kanagawa, Japan

Kazuhito Tsuchida