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Electronic device

An electronic device and circuit technology, applied in the direction of circuit devices, DC network circuit devices, measuring devices, etc., can solve problems such as insufficient power supply, stop operation of electronic devices, unable to ensure stable operation, etc., and achieve the effect of ensuring power supply

Inactive Publication Date: 2010-08-11
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the power supply method disclosed in Japanese Patent Laid-Open No. 2005-141732 does not conform to the USB standard and cannot guarantee stable operation
In addition, power shortage still occurs in electronic devices including electronic parts such as power amplifiers that require instantaneous current of about several amperes
Insufficient power supply causes the driving voltage of the power amplifier to drop, causing the problem that the entire operation of the electronic device stops suddenly

Method used

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Embodiment Construction

[0038] Hereinafter, an electronic device according to an embodiment of the present invention will be described. The electronic device of this embodiment is in the form of a portable loudspeaker device, adapted to be driven via bus power via a USB connection, or inherently powered via an AC adapter connection, or both.

[0039] figure 1A block diagram showing the configuration of the power supply circuit of the speaker device of this embodiment. Such as figure 1 As shown, the speaker device 1 includes a USB power input circuit 11, an AC adapter power input circuit 12, a first regulator 13 and a second regulator 18, a first switch to a third switch 14-16, a DC-DC converter 17, First current limiting circuit 19 and second current limiting circuit 20 , CPU 21 , digital circuit 22 , analog circuit 23 , power amplifier 24 and capacitor 25 . Hereinafter, the first regulator 13 and the second regulator 18 will be called the first LDO 13 and the second LDO 18, and the first switch t...

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Abstract

Provided is an electronic device which can prevent operation stop attributed to lowering of an electronic device operation voltage. A pre-stage of a power amplifier (24) is connected to a capacitor and a first and a second current limit circuit. A CPU (21) monitors a voltage of the capacitor and corrects a gain of the power amplifier (24) in accordance with the voltage value. Moreover, when the electronic device includes a speaker system having a plurality of channels, an audio signal reproduction mode is switched, for example, between a stereo reproduction and a monaural reproduction according to the voltage value of the capacitor.

Description

technical field [0001] The present invention relates to electronic devices that can operate with less power supply and have greater instantaneous power consumption. Background technique [0002] In general, bus-powered portable USB devices are known. However, the USB bus only has a current supply capability of 100mA (up to about 500mA). Thus, an AC adapter is generally used to power a USB device with a large current consumption. [0003] In this regard, for example, Japanese Patent Laid-Open No. 2005-141732 discloses a USB device supplied with power from a USB port of a host device via two USB cables (ie, a USB cable and a DC-to-USB conversion cable). The DC to USB conversion cable has a USB plug adapted to be connected to a USB port of the host device; a DC plug adapted to be connected to the DC jack of the USB device; and a detection circuit for detecting whether the conversion cable is connected to the host device. When the conversion cable is connected to the host dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30G06F1/26H02J1/00H04R3/00H04S7/00
CPCH02J1/108H03G3/007H02J1/14H03G3/3042
Inventor 梶田治雄
Owner YAMAHA CORP
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