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Semiconductor integrated circuit and operating method thereof

An integrated circuit and semiconductor technology, applied in the effective field of electronic circuits, can solve the problem of large battery consumption

Inactive Publication Date: 2013-12-18
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of wireless power transfer system is intended to deal with the fact that cellular telephones known as "smartphones" are battery draining

Method used

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  • Semiconductor integrated circuit and operating method thereof
  • Semiconductor integrated circuit and operating method thereof
  • Semiconductor integrated circuit and operating method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0104] >

[0105] figure 1 is a diagram showing the configuration of a multifunctional cellular phone equipped with a semiconductor integrated circuit 212 for battery charge control according to the first embodiment.

[0106] figure 1 The shown multifunctional cellular phone includes a power transmitting circuit 1 , a power receiving circuit 2 and a power receiving side system 3 . Specifically, in figure 1 In the shown multifunctional cellular phone, an RF signal from the power transmitting side antenna coil 13 is received by the power receiving side antenna coil 25 , thereby performing charging of the secondary battery 26 and power supply to the power receiving side system 3 .

[0107] >

[0108] Such as figure 1 As shown, the power transmission circuit 1 on the transmission side of the wireless power transmission system is equipped with an AC power supply through an AC adapter 10 . The power transmission circuit 1 includes a microcontroller unit (MCU) 11 and a powe...

no. 2 example

[0182] >

[0183] Figure 6 is shown by figure 2 and 4 A diagram showing an operation in which the semiconductor integrated circuit 212 according to the second embodiment automatically selects a power source for use from among a plurality of power sources.

[0184] figure 2 and 4 The shown semiconductor integrated circuit 212 according to the first embodiment has implemented Figure 5 The initial operation of automatically selecting the power supply to be used for the first time from multiple power supplies is shown.

[0185] Such as Figure 6 shown, described below figure 2 and 4 The shown semiconductor integrated circuit 212 according to the second embodiment is capable of performing an initial operation of automatically selecting a power supply to be used from among a plurality of power supplies for the first time, and is capable of performing further automatic selection even in the case of additionally supplying subsequent power supply voltages. The voltage used f...

no. 3 example

[0201] >

[0202] Figure 8 is shown by figure 2 and 4 A diagram showing an operation in which the semiconductor integrated circuit 212 according to the third embodiment automatically selects a power supply to be used from among a plurality of power supplies.

[0203] Figure 6 An advantage of the illustrated operation of automatically selecting a power source to be used from a plurality of power sources according to the second embodiment is that the operation can be performed at figure 2 and 4 Nearly perfect execution is shown in the semiconductor integrated circuit 212 according to the second embodiment, but on the other hand, this operation has a problem in that the degree of freedom of automatic selection is low. That is, battery-operated electronic devices such as multifunctional cellular phones, tablet PCs, etc. need to increase the degree of freedom in the operation of automatically selecting a used power source from a plurality of power sources in order to cope wi...

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Abstract

A semiconductor integrated circuit and its operating method are provided. The present circuit has first and second supply terminals capable of supplying first and second power supply voltages respectively, an input voltage selection circuit coupled to the first and second supply terminals, and first and second power supply switches. The input voltage selection circuit includes a power-on reset circuit, an input voltage detection circuit and a control circuit. When the supply of the first or second power supply voltage to one of both supply terminals is detected upon completion of a power on reset operation, one of both power supply switches and the other thereof are controlled to on and off respectively. When the supply of both power supply voltages to both supply terminals is detected, the one thereof and the other thereof are respectively controlled to on and off according to the preset order of precedence.

Description

[0001] Related Application Cross Reference [0002] The disclosure of Japanese Patent Application No. 2012-120696 filed on May 28, 2012 including specification, drawings and abstract is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a semiconductor integrated circuit and an operating method thereof, and particularly relates to a technique effective for realizing an electronic circuit for automatically selecting a power source to be used from among a plurality of power sources. Background technique [0004] As described in, for example, each of the following Patent Documents 1 and 2, the IC card is equipped with a semiconductor integrated circuit and an antenna coil, and the power supply to the IC card is received by the antenna coil from a signal called "reader / writer". The RF signal output by the read / write device of the "card reader" is executed by rectifying the RF signal by the rectification circuit. Therefore...

Claims

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Application Information

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IPC IPC(8): H02J9/06
CPCH02J9/06G06F1/26G06F1/263G06F1/266H03K17/223H02J2207/40H01L27/04G06K19/07
Inventor 鹿山正规
Owner RENESAS ELECTRONICS CORP
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