JP2012223077A - Charging system - Google Patents

Charging system Download PDF

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Publication number
JP2012223077A
JP2012223077A JP2011090151A JP2011090151A JP2012223077A JP 2012223077 A JP2012223077 A JP 2012223077A JP 2011090151 A JP2011090151 A JP 2011090151A JP 2011090151 A JP2011090151 A JP 2011090151A JP 2012223077 A JP2012223077 A JP 2012223077A
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voltage
power supply
charging system
cable
charging
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JP2011090151A
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Japanese (ja)
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Shigeyuki Kikkawa
茂行 吉川
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Kyocera Corp
京セラ株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

Provided is a charging system capable of suppressing variations in load voltage applied to a mobile phone even when a power feeding cable is thin and floating resistance is large.
The present invention is a charging system that includes an AC adapter and a power supply cable, and charges a secondary battery built in the mobile terminal by connecting the power supply cable to the mobile terminal. The AC adapter includes an input stage circuit that converts an AC voltage supplied from the outside into a DC charging voltage, a measurement circuit that measures a voltage drop due to the power supply cable, and a voltage value corresponding to the measured voltage drop. And correction means for correcting the voltage value of the charging voltage so as to be supplied in an increased manner.
[Selection] Figure 1

Description

  The present invention relates to a charging system for charging a mobile terminal such as a mobile phone.

  The current flowing through the mobile phone (hereinafter referred to as “load current”) varies depending on the processing executed by the mobile phone, and in particular, the load current increases during a call or data communication (for example, about 800 mA). Become). If the voltage applied from the battery to the circuit of the mobile phone (hereinafter referred to as “load voltage”) varies with the fluctuation of the load current, the power supplied to the circuit becomes unstable and the operation of the mobile phone becomes unstable. It becomes unstable.

  Here, Patent Document 1 discloses an invention of a switching regulator that obtains an error between a DC voltage supplied to a portable information terminal and an actual load voltage and adjusts the DC voltage supplied based on the error. . As a result, even if the load current flowing through the portable information terminal is fluctuating, the power supplied to the circuit is stabilized.

JP 2007-6668 A

  By the way, as a charging device for charging a secondary battery inside a mobile phone, in recent years, a separate type AC adapter in which an AC adapter and a power feeding cable are separated may be used. The separation type AC adapter includes a USB (Universal Serial Bus) connector, and uses a power line in the USB cable as a power supply cable. A USB cable compliant with the USB standard includes at least four signal lines (two power lines and two data lines), and each signal line is compared with a power supply cable of a conventional charging device. And the impedance of the line (hereinafter referred to as “floating resistance”) is large.

Conventional AC adapters correct the output voltage value using an internal feedback circuit. However, in the case of a separate AC adapter, a voltage drop occurs due to the floating resistance of the power supply cable. The value cannot be corrected appropriately.
Therefore, when a separate AC adapter is used as a charging device, if a load current flows through the mobile phone due to an operation during charging, there is a problem that variation in load voltage applied to the mobile phone increases due to the influence of floating resistance. . The technique of Patent Document 1 discloses an invention relating to a power supply circuit inside a mobile phone, and does not consider the situation where the mobile phone is connected to a charging device.

  Therefore, the present invention has been made in view of the above problems, and even when the power supply cable of the charging device is thin and the floating resistance is large, it is possible to suppress variations in load voltage applied to the mobile phone. Is to provide a simple charging system.

  To achieve the above object, the present invention comprises an AC adapter and a power supply cable, and a charging system for charging a secondary battery built in the mobile terminal by connecting the power supply cable to the mobile terminal. The AC adapter includes an input stage circuit that converts an AC voltage supplied from the outside into a DC charging voltage, a measurement circuit that measures a voltage drop due to the power supply cable, and a measured voltage drop. Correction means for correcting the voltage value of the charging voltage so as to increase and supply the corresponding voltage value.

  With the above configuration, even when the power supply cable of the charging device is thin and the floating resistance is large, variation in load voltage applied to the mobile phone can be suppressed.

It is a figure which shows the structure of the charging system which concerns on Embodiment 1. FIG. 3 is a time chart for explaining the operation of the charging system according to the first embodiment. It is a figure which shows the structure of the charging system which concerns on Embodiment 2. FIG. It is a figure which shows the structure of the charging system which concerns on Embodiment 3. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1. Embodiment 1
Here, a first embodiment (Embodiment 1) of the charging system according to the present invention will be described.
FIG. 1 is a configuration diagram of a charging system according to the first embodiment. Although the charging system according to the first embodiment includes the AC adapter 1 and the USB cable 2, for convenience of explanation, FIG. 1 also includes the mobile phone 3 and the AC power supply 4.

<Overview>
First, an outline of a charging system including the AC adapter 1 and the USB cable 2 will be described.
The AC adapter 1 includes a plug (not shown). When the plug is inserted into the outlet of the commercial AC power supply 4, 100V AC power is supplied. AC adapter 1 converts the AC power 100 V, the DC voltage V in for charging a secondary battery incorporated in the mobile phone 3 as an example of a portable terminal. The AC adapter 1 includes a USB connector 25, and a USB connector 26 provided at one end of the USB cable 2 is connected to the USB connector 25. The USB connector 29 of the mobile phone 3 is connected to the USB connector 29 provided at the other end of the USB cable 2.

The USB cable 2 includes a total of four signal lines including two power lines (VBUS, GND) conforming to the USB standard and two data lines (D +, D-). In FIG. 1, only the VBUS 27 and one data line 28 are shown. DC voltage V in outputted from the AC adapter 1 is supplied to the mobile telephone 3 via the VBUS as feeder cable according to the present invention.

When the load current flowing from the AC adapter 1 to the mobile phone 3 via the USB cable 2 is I 0 and the floating resistance of VBUS is R 0 , the load voltage V 0 is V 0 = V in −I 0 R 0. . AC adapter 1, in order to stabilize the operation of the mobile phone 3, the load voltage V 0 is to adjust the value of the DC voltage V in such that between 4.75 V to 5.25 V.
<Configuration>
Here will be described the circuit configuration for adjusting the value of the DC voltage V in supplied from the AC adapter 1 to the cellular phone 3.

  The AC adapter 1 includes a diode bridge 11, a switch 12, a diode 14, a transformer 15, a diode 17, a diode 18, and a smoothing capacitor 19 that constitute an input stage circuit according to the present invention, and a difference that constitutes a measurement circuit according to the present invention. It comprises a dynamic amplifier 20, a field effect transistor (hereinafter referred to as “FET”) 21, a photocoupler 22, a diode 23, a comparator 24, and a switching control unit 13 that constitute correction means of the present invention. The

In the input stage circuit, first, a 100V commercial AC power supply is rectified into a unidirectional pulsating flow by the diode bridge 11. A switch 12 as a switching element of the present invention is connected to the output terminal of the diode bridge 11. In the present embodiment, a MOSFET is used as an example of the switch 12.
A switching control unit 13 is connected to the gate of the switch 12, and the switch 12 is once rectified by the diode bridge 11 by switching on / off according to a control pulse signal output from the switching control unit 13. The converted power is converted into pulsed power. Thereafter, the amount of current is adjusted by the diode 14 connected to the output terminal of the switch 12, and then the pulsed AC voltage is stepped down by the transformer 15. Stepped-down AC voltage, the diodes 17 and 18, is converted into a stable DC voltage V in by the smoothing capacitor 19.

In the measurement circuit, the potential of the output terminal of the input stage circuit is input to the non-inverting input terminal of the differential amplifier 20 as the first voltage comparator, and the potential of the VBUS 27 inside the USB connector 29 is input to the inverting input terminal. It is input via the data line 28.
The differential amplifier 20 compares the potential of the output terminal of the input stage circuit with the potential of the VBUS 27 and outputs a voltage signal that is the potential difference. Here, the potential at the output terminal of the input stage circuit is equal to the input voltage V in outputted from the AC adapter 1, the load current flowing through the mobile telephone 3 and I 0, the floating resistance VBUS27 and R 0, The voltage signal output from the differential amplifier 20 is V in −I 0 R 0 = V 0 (load voltage).

The voltage signal output from the differential amplifier 20 is input to the gate electrode of the FET 21. Here, FET 21 because the input impedance is high, the voltage input to the gate electrode has less error from the load voltage V 0, it is possible to measure the load voltage V 0 with high accuracy. The load voltage V 0 input to the gate electrode of the FET 21 is amplified and then input to the photocoupler 22.

The photocoupler 22 includes a light emitting diode that is a light emitting element and a phototransistor that is a light receiving element. The photodiode and the phototransistor are packaged, and transmit the value of the load voltage V 0 measured by the differential amplifier 20 and the FET 21 to the comparator 24 while insulating the measurement circuit and the input stage circuit.
In the correcting means, the reference potential V is connected to the inverting input terminal of the comparator 24 which is the second voltage comparator. When the load voltage V 0 output from the photocoupler 22 is input to the non-inverting input terminal of the comparator 24, the comparator 24 compares the load voltage V 0 with the reference potential V. Comparator 24, the load voltage V 0 is, is greater than the reference potential V outputs a voltage signal of the High level, the load voltage V 0 is, if the reference potential V smaller outputs a voltage signal of a Low level.

  The voltage signal output from the comparator 24 is input to the switching control unit 13. The switching control unit 13 is connected to the gate of the switch 12 and supplies a control pulse signal (rectangular wave) for driving the switch 12 based on the voltage signal output from the comparator 24. As an example, the switching control unit 13 of the present embodiment holds two frequencies f1 and f2 in advance, and selects one of the two frequencies f1 and f2 in accordance with the input voltage signal to control pulse signals. Is generated.

Here, the operation of the switching control unit 13 will be described with reference to the time chart shown in FIG.
When the load voltage V 0 is higher than the reference potential V, the voltage signal output from the comparator 24 is at a high level. At this time, the switching control unit 13 supplies the switch 12 with a control pulse signal having the frequency f1.

When the load voltage V 0 is lower than the reference potential V, the voltage signal output from the comparator 24 is at a low level. At this time, the switching controller 13 supplies the switch 12 with a control pulse signal having a frequency f2 (f1 <f2).
Thus, in the input stage circuit, a load voltage V 0 is when higher than the reference potential V, is corrected such that the value of the DC voltage V in supplied to the USB cable 2 is reduced. On the other hand, when the load voltage V 0 is lower than the reference potential V, to supply to the mobile phone 3 to increase the voltage value corresponding to the voltage drop caused by the power supply line 27, so that the value of the DC voltage V in increases To correct.
2. Embodiment 2
Here, a second embodiment (Embodiment 2) of the charging system according to the present invention will be described.

  FIG. 3 is a configuration diagram of a charging system according to the second embodiment. Although the charging system according to the second embodiment includes the AC adapter 1a and the USB cable 2a, as in the first embodiment, for convenience of explanation, FIG. 3 includes the mobile phone 3 and the AC power supply 4 as well. is doing. In FIG. 3, the same components as those of the first embodiment are denoted by the same reference numerals as those in FIG.

  The differences from the first embodiment are that the AC adapter 1a does not include a differential amplifier as a first voltage comparator, that a resistor 30 is inserted into the VBUS 27 of the USB cable 2a, and the USB cable 2a. The USB connector 29 includes a differential amplifier 20a as a first voltage comparator. The resistor 30 is inserted in series with the VBUS 27 inside the USB connector 29.

In the second embodiment, a load current I 0 flowing through the mobile phone 3 is converted into a voltage I 0 R by the resistor 30. Then, by measuring the potential difference between both ends of the resistor 30 by the differential amplifier 20a, the value of the load voltage V 0 = I 0 R applied to the mobile phone 3 is output. The load voltage V 0 output from the differential amplifier 20 a is input to the gate electrode of the FET 21 through the data line 28. Other configurations are the same as those in the first embodiment.
3. Embodiment 3
Here, a third embodiment (third embodiment) of the charging system according to the present invention will be described.

  FIG. 4 is a configuration diagram of a charging system according to the third embodiment. Although the charging system according to the third embodiment includes the AC adapter 1b and the USB cable 2b, as in the first embodiment, for convenience of explanation, FIG. 4 includes the mobile phone 3 and the AC power supply 4 as well. is doing. In FIG. 4, the same components as those in the first and second embodiments are denoted by the same reference numerals as those in FIGS. 1 and 3, and detailed description thereof is omitted.

The third embodiment is the same as the second embodiment in that the resistor 30 is inserted in series with the VBUS 27 inside the USB connector 29, and the load current I 0 is converted into the voltage I 0 R by the resistor 30.
In the second embodiment, the differential amplifier 20a as the first voltage comparator is provided in the USB connector 29, whereas in the third embodiment, the differential amplifier 20b as the first voltage comparator is AC. It is provided in the adapter 1b.

Then, the USB cable 2b inputs the potentials at both ends of the resistor 30 to the non-inverting input terminal and the inverting input terminal of the differential amplifier 20b via the data line 28a and the data line 28b.
The differential amplifier 20 b outputs a load voltage V 0 = I 0 R applied to the mobile phone 3 by measuring the potential difference between both ends of the resistor 30. The load voltage V 0 output from the differential amplifier 20 b is input to the gate electrode of the FET 21. Other configurations are the same as those in the first embodiment.
4). Effects of the Embodiment According to the first to third embodiments described above, even when a thin power supply cable such as the VBUS 27 of the USB cable 2 is used for charging the mobile phone 3, the voltage drop due to the power supply cable is measured with high accuracy. In addition, it is possible to correct the drive of the switch 12 of the input stage circuit. For this reason, even when the load current fluctuates by using the mobile phone 3 being charged, it is possible to suppress variations in the load voltage V 0 and stabilize the operation of the mobile phone 3.
5. Other Modifications The embodiment of the charging system according to the present invention has been described above. However, the illustrated charging system can be modified as follows, and the present invention is charged as shown in the above-described embodiment. Of course, it is not limited to the system.
(1) In the above embodiment, VBUS, which is a power line of a USB cable, is used as the power supply cable. However, the power supply cable used in the present invention is not limited to this, and any cable may be used. The present invention is particularly useful for cables where the wires are thin and the voltage drop due to stray resistance is expected to affect the load voltage.
(2) In the above embodiment, the separation type AC adapter in which the AC adapter and the power feeding cable are separated is used. However, the AC adapter used in the present invention is not limited to the separation type. An AC adapter in which a power feeding cable is integrated may be used.
(3) The mobile phone in the above embodiment is merely an example of a load. The load to which the charging system of the present invention supplies power is not limited to a mobile phone, but may be a mobile terminal such as a PDA (Personal Digital Assistant) or a portable game machine.
(4) The USB cable in the above embodiment has a configuration including four signal lines. However, the USB cable used in the present invention is not limited to this. It is only necessary to include at least four signal lines, and a USB cable including more signal lines may be used.
(5) The circuit configuration of the input stage circuit and the correction means of the AC adapter described in the above embodiment is an example. The input stage circuit used in the present invention requires a circuit configuration capable of converting at least 100V commercial power supply to 5V DC voltage. In addition to the circuits described in FIGS. A configuration including a filter circuit, a protection circuit, a smoothing capacitor connected to a diode bridge, and the like may be used. Furthermore, in the above embodiment, a MOSFET is used as the switch 12, but other switching elements may be used.
6). Supplementary explanation Hereinafter, a charging system as one embodiment of the present invention, and its modifications and effects will be described.
(A) A charging system according to an embodiment of the present invention includes an AC adapter and a power supply cable, and charges a secondary battery built in the mobile terminal by connecting the power supply cable to the mobile terminal. In the charging system, the AC adapter includes an input stage circuit that converts an AC voltage supplied from the outside into a DC charging voltage, a measurement circuit that measures a voltage drop due to the power supply cable, and a measured voltage drop Correction means for correcting the voltage value of the charging voltage so as to increase and supply the voltage value corresponding to the minute.

According to this configuration, even when the power supply cable that supplies power to the mobile terminal is thin and the floating resistance of the power supply cable is large, the charging voltage that is corrected for the voltage drop due to the floating resistance is supplied to the mobile terminal. can do. Thereby, it is possible to suppress variations in load voltage applied to the mobile terminal.
In addition, since the feeding cables are mass-produced at the manufacturing factory, the floating resistance of each feeding cable varies. However, since the present invention actually measures the voltage drop due to the stray resistance, an appropriate correction can be performed for each power cable.
(B) In the charging system, the input stage circuit includes a switching element, and the measurement circuit calculates a potential of an output end of the input stage circuit and a potential of a connector provided on the portable terminal side of the power feeding cable. A first voltage comparator that compares and outputs a voltage signal based on a potential difference; and a gate electrode that receives a voltage signal output from the first voltage comparator, and amplifies and outputs the voltage signal. A field effect transistor that compares the potential difference between the voltage signal output from the field effect transistor and a reference potential, and outputs a voltage signal based on the potential difference; A switching control unit that controls on / off of the switching element according to a voltage signal output from the second voltage comparator may be provided.

According to this configuration, it is possible to measure the load voltage applied to the portable terminal in the first voltage comparator by feeding back the potential of the connector to the measurement circuit of the AC adapter. Moreover, the voltage signal output from the first voltage comparator is input to the field effect transistor, thereby improving the load voltage detection accuracy.
(C) In the charging system, the AC adapter includes a USB connector, and is connected to a USB cable including a power line and a data line via the USB connector, and the power supply cable is included in the USB cable. A potential of a connector that is a power supply line and is provided on the portable terminal side of the power supply cable may be input to the first voltage comparator via the data line.

A USB cable conforming to the USB standard includes at least four signal lines. Each signal line included in the USB cable is thin and has a large floating resistance.
Therefore, by using the present invention, it is possible to supply the mobile terminal with a charging voltage corrected in anticipation of a voltage drop caused by the power supply line VBUS, and thus it is possible to suppress variations in load voltage applied to the mobile terminal. Become.
(D) A charging system according to an embodiment of the present invention includes an AC adapter and a power supply cable, and charging the secondary battery built in the mobile terminal by connecting the power supply cable to the mobile terminal. The power supply cable includes a resistor inside a connector for connecting the mobile terminal, and the charging system includes an input stage circuit that converts an AC voltage supplied from the outside into a DC charging voltage. And measuring means for measuring the voltage drop due to the resistor, and correcting means for correcting the voltage value of the charging voltage output from the input stage circuit using the value of the measured voltage drop. .

According to this configuration, the load voltage can be detected by measuring the voltage drop due to the resistance inside the connector of the power supply cable.
Therefore, even when the power supply cable is thin and the floating resistance is large, the charging voltage can be corrected using the value of the load voltage, so that it is possible to suppress variations in the load voltage applied to the mobile terminal. Become.
(E) In the charging system, the input stage circuit includes a switching element, and the measurement unit compares a potential between both ends of the resistor, and outputs a voltage signal based on the potential difference; A field effect transistor having a gate electrode to which a voltage signal output from the first voltage comparator is input and amplifying and outputting the voltage signal; and the correction means outputs from the field effect transistor A second voltage comparator that compares a potential difference between a voltage signal to be applied and a reference potential and outputs a voltage signal based on the potential difference, and the switching element according to a voltage signal output from the second voltage comparator And a switching control unit that controls on / off of the power supply.

According to this configuration, it is possible to measure the load voltage applied to the portable terminal in the first voltage comparator. Moreover, the voltage signal output from the first voltage comparator is input to the field effect transistor, thereby improving the load voltage detection accuracy.
(F) In the charging system, the connector of the power supply cable includes the first voltage comparator, and the AC adapter includes the field effect transistor, the input stage circuit, and the correction unit. You may comprise.

According to this configuration, the load voltage applied to the portable terminal can be measured by the first voltage comparator provided in the connector of the power feeding cable.
(G) In the charging system, the AC adapter includes a USB connector, and is connected to a USB cable including a power line and a data line via the USB connector, and the power feeding cable is included in the USB cable. A voltage signal that is a power supply line and is input to the gate electrode of the field effect transistor may be input to the gate electrode via the data line.

A USB cable conforming to the USB standard includes at least four signal lines. Each signal line included in the USB cable is thin and has a large floating resistance.
Therefore, by using the present invention, it is possible to supply the mobile terminal with a charging voltage corrected in anticipation of a voltage drop caused by the power supply line VBUS, and thus it is possible to suppress variations in load voltage applied to the mobile terminal. Become.
(H) In the charging system, the AC adapter may include the first voltage comparator, the field effect transistor, the input stage circuit, and the correction unit.

According to this configuration, it is not necessary to provide the first voltage comparator inside the connector of the power feeding cable.
(I) In the charging system, the AC adapter includes a USB connector, and is connected to a USB cable including a power line and a data line via the USB connector, and the power supply cable is included in the USB cable. A potential of both ends of the resistor may be input to the first voltage comparator via the data line.

A USB cable conforming to the USB standard includes at least four signal lines. Each signal line included in the USB cable is thin and has a large floating resistance.
Therefore, by using the present invention, it is possible to supply the mobile terminal with a charging voltage corrected in anticipation of a voltage drop caused by the power supply line VBUS, and thus it is possible to suppress variations in load voltage applied to the mobile terminal. Become.

  The present invention relates to an industry that manufactures and sells a charging device for charging a portable terminal such as a cellular phone, and even when the power feeding cable is thin and the floating resistance of the power feeding cable is large, the variation of the load voltage is suppressed. It can be used as a mechanism for stabilizing the operation of the terminal.

1, 1a, 1b AC adapter 2, 2a, 2b USB cable 3 Mobile phone 4 Commercial AC power supply 11 Diode bridge 12 Switch 13 Switching control unit 14, 17, 18, 23 Diode 15 Transformer 19 Smoothing capacitor 20, 20a, 20b Differential Amplifier 22 Photocoupler 24 Comparator 25, 26, 29 USB connector 30 Resistance

Claims (9)

  1. A charging system comprising an AC adapter and a power supply cable, and charging a secondary battery built in the mobile terminal by connecting the power supply cable to the mobile terminal,
    The AC adapter is
    An input stage circuit for converting an AC voltage supplied from the outside into a DC charging voltage;
    A measurement circuit for measuring a voltage drop caused by the power supply cable;
    A charging system comprising: correction means for correcting the voltage value of the charging voltage so as to increase and supply a voltage value corresponding to the measured voltage drop.
  2. The input stage circuit includes a switching element,
    The measurement circuit includes:
    A first voltage comparator that compares the potential of the output terminal of the input stage circuit with the potential of a connector provided on the portable terminal side of the power supply cable, and outputs a voltage signal based on the potential difference;
    A gate electrode to which a voltage signal output from the first voltage comparator is input, and a field effect transistor that amplifies and outputs the voltage signal,
    The correction means includes
    A second voltage comparator that compares a potential difference between a voltage signal output from the field effect transistor and a reference potential and outputs a voltage signal based on the potential difference;
    The charging system according to claim 1, further comprising: a switching control unit that controls on / off of the switching element in accordance with a voltage signal output from the second voltage comparator.
  3. The AC adapter includes a USB connector, and is connected to a USB cable including a power line and a data line via the USB connector.
    The power supply cable is a power line included in the USB cable,
    The charging system according to claim 2, wherein a potential of a connector provided on the portable terminal side of the power feeding cable is input to the first voltage comparator via the data line.
  4. A charging system comprising an AC adapter and a power supply cable, and charging a secondary battery built in the mobile terminal by connecting the power supply cable to the mobile terminal,
    The power supply cable includes a resistor inside a connector for connecting the mobile terminal,
    The charging system includes:
    An input stage circuit for converting an AC voltage supplied from the outside into a DC charging voltage;
    Measuring means for measuring a voltage drop due to the resistance;
    A charging system comprising: correction means for correcting the voltage value of the charging voltage output from the input stage circuit using the measured voltage drop value.
  5. The input stage circuit includes a switching element,
    The measuring means includes
    A first voltage comparator that compares potentials across the resistor and outputs a voltage signal based on the potential difference;
    A gate electrode to which a voltage signal output from the first voltage comparator is input, and a field effect transistor that amplifies and outputs the voltage signal,
    The correction means includes
    A second voltage comparator that compares a potential difference between a voltage signal output from the field effect transistor and a reference potential and outputs a voltage signal based on the potential difference;
    The charging system according to claim 4, further comprising: a switching control unit that controls on / off of the switching element in accordance with a voltage signal output from the second voltage comparator.
  6. The connector of the power supply cable includes the first voltage comparator;
    The charging system according to claim 5, wherein the AC adapter includes the field effect transistor, the input stage circuit, and the correction unit.
  7. The AC adapter includes a USB connector, and is connected to a USB cable including a power line and a data line via the USB connector.
    The power supply cable is a power line included in the USB cable,
    The charging system according to claim 6, wherein a voltage signal input to the gate electrode of the field effect transistor is input to the gate electrode via the data line.
  8. The charging system according to claim 5, wherein the AC adapter includes the first voltage comparator, the field effect transistor, the input stage circuit, and the correction unit.
  9. The AC adapter includes a USB connector, and is connected to a USB cable including a power line and a data line via the USB connector.
    The power supply cable is a power line included in the USB cable,
    The charging system according to claim 8, wherein the potentials at both ends of the resistor are input to the first voltage comparator through the data line.
JP2011090151A 2011-04-14 2011-04-14 Charging system Withdrawn JP2012223077A (en)

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JP2016085591A (en) * 2014-10-24 2016-05-19 ローム株式会社 Usb power supply device, electronic equipment using the same, and control method for usb power supply device
JP2017045162A (en) * 2015-08-25 2017-03-02 Necプラットフォームズ株式会社 Power supply adapter, and method for adjusting voltage of power supply adapter
JP2017507637A (en) * 2014-01-28 2017-03-16 グアンドン オッポ モバイル テレコミュニケーションズ コーポレーション,リミテッドGuangdong Oppo Mobile Telecommunications Corp., Ltd. Method for processing impedance abnormality of power adapter, terminal and charging circuit
JP2017518727A (en) * 2014-11-11 2017-07-06 クワントン オーピーピーオー モバイル テレコミュニケーションズ コーポレイション リミテッド Power adapter and terminal
JP2018516057A (en) * 2016-02-05 2018-06-14 グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッド Adapter and charge control method
JP2018532358A (en) * 2016-07-26 2018-11-01 グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッド Adapter and charge control method
US10326291B2 (en) 2014-11-11 2019-06-18 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Quick charging method, power adapter and mobile terminal

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017507637A (en) * 2014-01-28 2017-03-16 グアンドン オッポ モバイル テレコミュニケーションズ コーポレーション,リミテッドGuangdong Oppo Mobile Telecommunications Corp., Ltd. Method for processing impedance abnormality of power adapter, terminal and charging circuit
JP2016085591A (en) * 2014-10-24 2016-05-19 ローム株式会社 Usb power supply device, electronic equipment using the same, and control method for usb power supply device
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