JP5540668B2 - Charging system - Google Patents

Description

  The present invention relates to a charging system, and more particularly to a charging system used when charging a terminal device operating with a secondary battery such as a mobile phone.

  In recent years, high-performance small terminal devices such as mobile phones are often used, and internal heat generation has become a problem in these terminal devices. For this reason, an increasing number of terminal devices are designed to generate heat so as not to cause problems such as burns and fires. By the way, it is known that a secondary battery such as a lithium ion battery cannot be rapidly charged when the battery is not in a specific temperature range. Therefore, the secondary battery is conventionally charged rapidly or normally while monitoring the ambient temperature.

  When charging a secondary battery with a terminal device that generates a large amount of heat, the charging operation itself generates heat, which may increase the temperature inside the device. In consideration of this temperature rise, even when the secondary battery itself is in a temperature range where rapid charging is possible, a heat generation design may be performed to suppress heat generation by suppressing the charging current. If the terminal device continues to be used in such a state where charging is suppressed, the secondary battery may be discharged and become inoperable. There is also a problem that a charging control circuit that controls charging current in the terminal device generates heat due to the operating current.

  Patent Document 1 describes a technology in which a charge control circuit that performs charge control in a terminal device is partitioned from other portions, and heat generated there is dissipated through an external connection terminal.

  Patent Document 2 describes that a heat absorption surface made of a material having high thermal conductivity is provided on the surface of a support portion that supports a mobile phone of a desktop holder (charging auxiliary device) that charges the mobile phone. The desktop holder dissipates heat received from the mobile phone from a vent formed in the casing of the desktop holder.

JP 2007-207870 A JP 2007-265800 A

  In the charging system described in Patent Document 1, since heat generated in the charging control circuit in the charging system is radiated to the outside, heat generation of the terminal device can be suppressed. However, the circuit that generates heat in the terminal device is not limited to the charge control circuit, but includes the secondary battery itself and other circuits, and the effects of the configuration of Patent Document 1 are limited.

  In the charging system described in Patent Document 2, heat is radiated from the terminal device on a heat absorbing surface provided for that purpose. That is, in this charging system, it is necessary to configure the heat dissipation mechanism by a member other than the charging circuit. This complicates the device configuration in the apparatus.

  In view of the above, the present invention makes it possible to dissipate heat generated in a terminal device during charging to the outside by using a function of a charging circuit that supplies a charging current to the terminal device. It aims at providing the charging system which can suppress the temperature rise of an apparatus.

To achieve the above object, the present invention provides a charger having a power generator for generating a power source for charging a device to be charged, and an external terminal of the charger, the power generator generating A cable for supplying the power to the device to be charged, a cable-side connector attached to the terminal on the device to be charged side of the cable, a device-side connector that is formed on the device to be charged and fits to the cable-side connector, A cable-side heat conduction member attached to the cable-side connector; and a device-side heat conduction member attached to the device-side connector and contacting the device to be charged, the cable-side heat conduction member and the device The side heat conducting member contacts each other when the cable side connector and the device side connector are fitted, and transmits heat generated in the charging target device to the charger. In addition, the charger is supplied from the power source generated by the power source generation unit to the device to be charged based on the first temperature sensor adjacent to the external terminal and the temperature detected by the first temperature sensor. A charging system is provided that includes a first current limiting circuit that limits current .

The present invention also includes a charger having a power generation unit that generates a power source for charging a device to be charged, and an external terminal of the charger, and the power source generated by the power generation unit is to be charged. A cable to be supplied to a charging auxiliary device equipped with a device, a cable side connector attached to a terminal on the charging target device side of the cable, and an auxiliary device side formed on the charging auxiliary device and fitted to the cable side connector A cable-side heat conduction member attached to the cable-side connector; and an auxiliary device-side heat conduction member attached to the auxiliary device-side connector and in contact with the device to be charged. When the cable side connector and the auxiliary device side connector are fitted to each other, the member and the auxiliary device side heat conducting member come into contact with each other and are generated in the device to be charged. The power is transmitted to the charger, and the charger generates a power source generated by the power source generator based on a first temperature sensor adjacent to the external terminal and a temperature detected by the first temperature sensor. And a first current limiting circuit that limits the current supplied to the charging target device .

  The charging system of the present invention has an effect of preventing an increase in the temperature of the charging target device during charging by the function of the charging circuit itself of the charging system.

The charging system of the secondary battery based on the 1st Embodiment of this invention. The charging system of the secondary battery based on the 2nd Embodiment of this invention.

  Prior to the description of the embodiments, the outline of the present invention will be described. The charging system according to the first aspect of the present invention includes, in its minimum configuration, a charger having a power generation unit that generates a power source for charging a device to be charged, and extends from an external terminal of the charger, A cable for supplying the power generated by the power generation unit to the device to be charged, a cable-side connector attached to the terminal on the device to be charged side of the cable, and formed on the device to be charged and fitted to the cable-side connector A device-side connector, and a pair of heat conducting members attached to the cable-side connector and the device-side connector and in contact with each other when the cable-side connector and the device-side connector are fitted together.

  The charging system according to the second aspect of the present invention has, in its minimum configuration, a charger having a power generation unit that generates a power source for charging a device to be charged, and extends from an external terminal of the charger, The power generated by the power generation unit is supplied to the charging auxiliary device equipped with the charging target device, the cable side connector attached to the terminal on the charging target device side of the cable, and formed in the charging auxiliary device, A pair of heat attached to the cable side connector, the auxiliary device side connector, and the cable side connector and the auxiliary device side connector that come into contact with each other when the cable side connector and the auxiliary device side connector are fitted. And a heat conduction member attached to the auxiliary device side connector is in contact with the heat conduction member of the device to be charged to transfer heat from the device to be charged. Transferring the heat-conducting member that comes in Bull connector.

  In the charging system of the present invention, the amount of heat generated in the charging target device is radiated to the charging device side by the cable for supplying power to the charging target device and its connector, so that the temperature increase of the charging target device during charging can be prevented.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a charging system for a secondary battery according to the first embodiment of the present invention, together with a terminal device to be charged. The charging system includes a charging control circuit 12 disposed in a mobile terminal device 11 on which a secondary battery is mounted, a charger 25 disposed outside the mobile terminal device 11 and connected to a power source, and a charger 25. And a connection circuit unit 20 for connecting the charge control circuit 12 to charge the portable terminal device 11 to be charged.

  A charging control circuit 12 for controlling the charging of the secondary battery is disposed in the casing of the mobile terminal device 11 to control the charging current of a secondary battery (not shown) in the mobile terminal device 11. The charging control circuit 12 monitors the measured value of the temperature sensor 16 that measures the temperature of the secondary battery, and controls the charging current based on the measured value. The charging control circuit 12 further monitors the temperature of the temperature sensor 17 that measures the casing temperature of the mobile terminal device 11. The charge control circuit 12 monitors the measured value of the temperature sensor 17 so that the casing temperature does not become hotter than the specified value. The charging control circuit 12 is arranged in the charging control circuit 12 in order to suppress heat generation due to charging when the temperature inside the device rises and the casing temperature of the mobile terminal device 11 is likely to exceed a specified value. The charging current is limited via the current limiting circuit 13. In this control, depending on the case, the control is performed until the charging current becomes 0, for example, and the operation of the charging control circuit 12 itself is stopped.

  The connection circuit unit 20 includes an external cable 23 for connecting the charger 25 and the charge control circuit 12 disposed in the mobile terminal device 11 and its accessories. The connection circuit unit 20 includes a metal connector 14 with high thermal conductivity disposed on the mobile terminal device 11 side, and releases heat from the metal connector 14 to the outside of the mobile terminal device 11 via the external cable 23. It has a function. Instead of the metal connector 14, a heat diffusion sheet having a high thermal conductivity may be attached to the resin connector. A metal piece 15 is attached to the metal connector 14, and the metal piece 15 functions as a heat conducting member that transfers heat inside the housing of the mobile terminal device 11 to the metal connector 14.

  The charger 25 includes an AC-DC conversion circuit 27 that is connected to an outlet (not shown) and generates a charging power source. The DC power obtained by the AC-DC conversion circuit 27 is supplied to the charging control circuit 12 of the mobile terminal device 11 via the external terminal 28, the external cable 23, and the metal connectors 22 and 14. When the metal connectors 14 and 22 are connected to the metal connector 22 used for the connection between the external cable 23 and the mobile terminal device 11, the metal connector 15 is fitted with the metal piece 15 of the mobile terminal device 11 and the metal piece. The metal piece 21 which transmits 15 temperatures is attached.

  The metal piece 15 is disposed on the back side of the metal connector 14 so as not to cause a burn when the metal connector 22 of the charger 25 is not connected to the metal connector 14. In addition, a part may be covered with the cover for a burn prevention. The temperature of the metal piece 21 is transmitted from the metal connector 22 on the cable side to the main body of the charger 25 via the external cable 23. The temperature sensor 24 is disposed adjacent to or in contact with the external terminal 28 on the charger 25 side of the external cable 23. The temperature sensor 24 measures the temperature of the metal piece 15 of the mobile terminal device 11 via the metal piece 21 and the external cable 23. The charger 25 includes a current limiting circuit 26 that controls the charging current supplied to the mobile terminal device 11 according to the temperature detected by the temperature sensor 24. In the present embodiment, the metal pieces 15 and 21 are formed separately from the metal connector, but may be formed integrally with the metal connector. In this case, unless it is a member indispensable for the function as a connector of a metal connector, the metal member attached to the metal connector is a metal piece constituting the heat conducting member in the present invention.

  The metal piece 15 is arranged so as to be maintained at the same temperature as the casing temperature (internal temperature) of the device to be charged. For example, the metal piece 15 is preferably brought into contact with a circuit board or a housing in the device to be charged, or disposed in the vicinity thereof. In addition, it can replace with the structure of this embodiment, and can maintain the metal piece 15 at the same temperature as a secondary battery. In this case, the metal piece 15 is brought into contact with, for example, a secondary battery or a support member that supports the secondary battery, or is disposed in the vicinity thereof.

  The charge control circuit 12 on the terminal device side monitors the temperature of the secondary battery and the casing temperature with the temperature sensors 16 and 17, and when the temperature of the secondary battery and the casing temperature are sufficiently low, the charger 25 Connect to and perform normal quick charging. When the temperature of the temperature sensor 16 rises, the charging control circuit 12 switches from quick charging to normal charging. In addition, when the temperature of the temperature sensor 17 rises excessively, charging is performed by further reducing the charging current from the normal charging. By performing current limitation based on the temperature detected by the temperature sensor 17, heat generation in the charge control circuit 12 is suppressed. In this way, the temperature of the secondary battery and the casing temperature are monitored, and charging is controlled according to these detected temperatures while limiting the charging current.

  On the other hand, the charger 25 monitors the temperature of the metal piece 21 connected to the metal piece 15 of the mobile terminal device 11 with the temperature sensor 24, and when the temperature of the metal piece 21 is sufficiently low, The charging current is supplied to the charging control circuit 12 in the mobile terminal device 11. When the temperature of the metal piece 21, that is, the temperature inside the casing of the mobile terminal device 11 is high, the charging current is suppressed low by the current limiting circuit 26 in the charger 25.

  As for the external cable 23, the electric wire itself that supplies the power for charging may constitute a heat conducting member, and in addition to this electric wire, a metal wire for heat transfer may be separately provided, or the electric wire may be provided from the surroundings. Heat may be efficiently transferred by the surrounding shield wire.

  In the above charging system, the operating current of the mobile terminal device 11 may be larger than the charging current by the charger 25 when both the current limiting circuits 13 and 26 limit the charging current. Therefore, when the current limiting circuit 26 on the charger side starts operating, the current limiting by the current limiting circuit 13 on the terminal device side is stopped. By stopping the operation of the current limiting circuit 13 on the terminal device side, the amount of heat generated inside the mobile terminal device 11 is suppressed. In this way, priority is given to the operation of other important circuits inside the mobile terminal device 11.

  Further, even if the amount of heat generated in the mobile terminal device 11 increases and the internal temperature rises, the heat stored in the mobile terminal device 11 is attached to the metal piece 15 and the cable-side connector 22 of the mobile terminal device 11. It is transmitted to the charger 25 through the connection of the metal piece 21. For this reason, the excessive temperature rise in the portable terminal device 11 is suppressed. As a result, when the temperature falls to a temperature range in which normal charging that does not require current limitation is possible, the current limitation in the current limitation circuit 13 in the mobile terminal device 11 and the current limitation circuit 26 in the charger 25 is released, and rapid Return to charge. For this reason, even if it does not stop operation | movement of the apparatus inside the portable terminal device 11, temperature falls and quick charge is attained.

  From the viewpoint of suppressing the temperature rise of the housing in the mobile terminal device 11, it is preferable to prioritize the current limitation by the current limitation circuit 26 between the current limitation by the current limitation circuit 13 and the current limitation by the current limitation circuit 26. . For this purpose, it is preferable that the temperature detected by both the temperature sensor 17 and the temperature sensor 24 is measured and the control by the current limiting circuit 26 is made stronger. Note that the current limiting circuit 13 itself may be omitted from the charging system from the viewpoint of suppressing the temperature rise of the housing in the mobile terminal device 11. Unlike this, the current limiting circuit 13 may perform current control based on both or one of the temperature sensors 16 and 17.

  In the said embodiment, since the heat inside a terminal device is dissipated to the charger side, the temperature rise inside a terminal device is suppressed. In addition, when the temperature inside the terminal device is high, the charging current is suppressed on the charger side, so that the operation of the current limiting circuit that suppresses the charging current inside the terminal device can be stopped. Can reduce the heat generated.

  FIG. 2 is a block diagram showing a configuration of a charging system according to the second embodiment of the present invention. In the present embodiment, the mobile terminal device 11 is mounted on the desktop holder (charging auxiliary device) 31 and charged. The internal configuration of the apparatus is the same as that shown in FIG. The mobile terminal device 11 has a metal piece 29 having the same function as the metal piece 15 of the first embodiment. In the desktop holder 31, a metal piece 32 connected to the metal piece 29 is attached to a metal connector 34. The temperature of the metal piece 32 can be radiated to the metal connector 34 on the desktop holder 31 via the metal piece 32. When the metal connector 34 and the connector 22 on the external cable 23 side are connected, the metal piece 32 and the metal piece 21 on the connector 22 side are fitted. The heat transmitted from the portable terminal device 11 to the desktop holder 31 side is further transmitted to the charger 25 via the external cable 23 and the external terminal 28.

  The charger 25 includes a temperature sensor 24, a current limiting circuit 26, and an AC-DC conversion circuit 27, as in the first embodiment. With the above configuration, the temperature sensor 24 measures the internal temperature of the mobile terminal device 11 and supplies it to the current limiting circuit 26. The current limiting circuit 26 limits the charging current as in the first embodiment.

  The desktop holder 31 is further provided with a temperature sensor 33, and has a cooling device 35 such as a fan or a Peltier element and a control circuit for operating the cooling device 35 when the detected temperature becomes high. . The cooling device 35 is disposed in close contact with or near the mobile terminal device 11. With this configuration, the heat of the portable terminal device 11 is diffused to the desktop holder 31 and the charger 25, so that the temperature is lowered more quickly, and the temperature of the portable terminal device 11 is lowered by the cooling device 35. Can be started.

  This embodiment is effective when the remaining amount of the secondary battery is particularly small. In the present embodiment, as in the first embodiment, in addition to providing a cooling function and a current limiting function on the charger 25 side, a cooling device 35 such as a Peltier element is disposed on the desktop holder 31 to provide a rapid cooling function. Give it. With this configuration, even if the temperature rises excessively in the mobile terminal device 11 and charging stops therefor, charging can be resumed quickly by rapidly cooling the mobile terminal device 11 with the added cooling function. It is.

  Although the invention has been particularly shown and described with reference to illustrative embodiments, the invention is not limited to these embodiments and variations thereof. It will be apparent to those skilled in the art that various modifications can be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

11: Portable terminal device 12: Charge control circuit 13: Current limiting circuit 14, 34: Metal connector (device-side connector)
15, 21, 29, 32: Metal piece (heat conduction member)
16, 17, 24, 33: Temperature sensor 20: Connection circuit unit 22: Metal connector (cable side connector)
23: External cable 25: Charger 26: Current limiting circuit 27: AC-DC conversion circuit 28: External terminal 31: Desktop holder 35: Cooling device

Claims (7)

A charger having a power generation unit for generating a power source for charging the device to be charged;
A cable that extends from an external terminal of the charger and supplies the power generated by the power generation unit to a device to be charged;
A cable-side connector attached to the end of the cable on the charge target device side; and
A device-side connector that is formed on the device to be charged and is fitted to the cable-side connector;
A cable-side heat conducting member attached to the cable-side connector ;
Included with the device side connector, and a device-side heat conductive member in contact with the charging object apparatus,
The cable-side heat conduction member and the device-side heat conduction member come into contact with each other when the cable-side connector and the device-side connector are fitted, and heat generated in the device to be charged is transferred to the charger. As well as
The charger is
A first temperature sensor adjacent to the external terminal;
A charging system comprising: a first current limiting circuit that limits a current supplied from the power source generated by the power source generation unit to the device to be charged based on a temperature detected by the first temperature sensor . The device-side heat conductive member is disposed in the vicinity of the circuit board of the charging target device, charging system according to claim 1. The device-side heat conduction member is disposed in the vicinity of the secondary battery charged in the charging target device, charging system according to claim 1. Disposed within the charging target device, based on at least one of an internal temperature of the temperature and the charging target device of a secondary battery is charged, a second current limiting the current of the power supplied from the apparatus side connector The charging system according to claim 1, further comprising a limiting circuit. 5. The charging system according to claim 4 , wherein the second current limiting circuit stops the current limiting operation when current limiting by the first current limiting circuit is started. 6. A charger having a power generation unit for generating a power source for charging the device to be charged;
A cable that extends from the external terminal of the charger and supplies the power generated by the power generation unit to a charging auxiliary device equipped with a device to be charged,
A cable-side connector attached to the end of the cable on the charge target device side; and
An auxiliary device side connector that is formed on the charging auxiliary device and fits into the cable side connector;
A cable-side heat conducting member attached to the cable-side connector ;
Comes to the auxiliary device side connector, and an auxiliary device side heat conductive member in contact with the charging object apparatus,
The cable-side heat conduction member and the auxiliary device-side heat conduction member are in contact with each other when the cable-side connector and the auxiliary device-side connector are fitted, and the heat generated in the charging target device is To the charger,
The charger is
A first temperature sensor adjacent to the external terminal;
A charging system comprising: a first current limiting circuit that limits a current supplied from the power source generated by the power source generation unit to the device to be charged based on a temperature detected by the first temperature sensor . The charging auxiliary device further comprises charging system according to claim 6 a cooling device that operates on the basis of a second temperature sensor for detecting the temperature of the charging target device, the detected temperature of the second temperature sensor.

Images