JP2006023197A - Mobile type electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile electronic device suppressed in battery consumption and improved in usability. <P>SOLUTION: The device comprises a voltage transformer 8 for transforming the voltage from an external power source input terminal 5 or a chargeable battery 2 to a specific voltage, a voltage detector 7 for detecting the voltage impressed to the external power source input terminal 5, a switching means 9 which is made switchable between whether or not the specific voltage is supplied inside as operation power, and a connection detection means 6 for detecting if or not the external power source is connected to the external power source input terminal 5. It also comprises a control circuit 11 for switch-controlling the switching means 9 so that the specific voltage is supplied inside as operation power when the voltage detection means 7 in operation detects the termination of voltage impression to the external power source input terminal 5 and when the connection detection means 6 detects no connection of the external power source, and so that the specific voltage is not supplied inside as operation power when the connection detection means 6 detects the connection of the external power source. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable electronic device having a battery for obtaining operating power and capable of operating with power supplied from an external power source.

  In recent years, many portable electronic devices have been developed that can be carried and used by downsizing. Such a portable electronic device usually operates with power from a battery built in or attached to the portable electronic device, but when used in a room or a vehicle, the battery In order to prevent wear and tear, many devices operate with electric power supplied from an external power source such as a commercial power source or a vehicle accessory power source.

  In such a conventional portable electronic device, for example, when operating with power supplied from an external power supply, such as a notebook personal computer, the power supply from the external power supply is cut off. In some cases, operation power is supplied from a built-in or attached battery so that the operation does not stop.

In addition, when the supply of operating power is cut off, an auxiliary power supply is provided to supply power only to the circuits necessary to continue the execution state of the OS (Operation System) and various application programs. There is also a navigation device that can shorten the time until the navigation operation is started when the operation is resumed (see, for example, Patent Document 1).
JP-A-11-304502

  However, as described above, in the conventional portable electronic device, when the supply of power from the external power source is cut off, the operation power is supplied from the built-in or attached battery so that the operation does not stop. In some cases, this may cause problems.

  For example, an in-vehicle navigation device operates with power supplied from an external power supply as operating power when the accessory power supply of the vehicle is turned off and the navigation device power is also turned off and operation stops. The conventional portable navigation device that can be operated operates with the power from the accessory power supply supplied via the cigarette lighter terminal etc. as the operating power when the accessory power supply of the vehicle is on, and when the accessory power supply is off, It operates with the power supplied from the battery built in or attached to the type navigation device as the operating power.

  That is, in the case of a conventional portable navigation device, even if the accessory power is turned off when the user of the portable navigation device leaves the vehicle, the operation of the portable navigation device continues, so that If left unattended, there is a problem that the battery built in or attached to the portable navigation device is consumed due to useless operation.

  In order to prevent this, when the accessory power is turned off, the user may turn off the power switch provided in the portable navigation device, but each time the accessory power is turned off, the power switch It is troublesome to turn off the power, and it is possible to forget to turn off the power switch.

  Therefore, even if the portable navigation device is operated with operating power obtained from the accessory power source, when the accessory power source is turned off, as in the in-vehicle navigation device, the portable navigation device If the power is turned off and the operation is stopped, battery consumption can be suppressed.

  However, in such a case, in the case of a portable navigation device, after arriving at the destination, the portable navigation device that was used by connecting to the accessory power source in the vehicle is carried outside the vehicle and used. When the connection with the accessory power source is removed for carrying, the portable navigation device is turned off. Therefore, after that, when it is carried and used, it is necessary to carry out a troublesome operation of operating the power switch of the portable navigation device again to turn on the power again, which is inconvenient.

  Further, in the prior art described in Patent Document 1, when the supply of operating power to the navigation device is cut off, there are no circuits other than those necessary for continuing the execution state of the OS and various application programs. The power is not supplied, and the navigation operation of the navigation device stops. Therefore, in the above-described case, that is, when the portable navigation device that operates by obtaining operating power from the accessory power source of the vehicle arrives at the destination and is used outside the vehicle, the accessory power source is used. When the portable navigation device is disconnected, the navigation operation of the portable navigation device is stopped. Therefore, when the portable navigation device is subsequently carried and used, the navigation operation is started again by operating the portable navigation device. There was a problem that it was necessary to perform troublesome operations and was also unusable.

  In view of the above-described points, an object of the present invention is to provide a portable electronic device that suppresses battery consumption and improves usability.

  In order to achieve the above object, a first aspect of the present invention is a portable electronic device having a battery for obtaining operating power and capable of operating with power from an external power source input to an external power source input terminal. Determining means for determining whether the portable electronic device is carried and used without being carried; and when the power from the external power source is not input during operation, the portable electronic device When the determining means determines that the device is carried and used, the power from the battery is controlled to be the operating power, and when the portable electronic device is used without being carried, the determining means Is determined, control means for controlling the power from the battery not to be operating power is provided.

  According to this configuration, when power from the external power supply is not input during operation and the determination unit determines that the portable electronic device is carried and used, the power from the battery Since the operation power of the portable electronic device is continued, the power from the battery operates when the determination means determines that the portable electronic device is used without being carried. Since power is not used, the operation of the portable electronic device stops.

  According to a second aspect of the present invention, there is provided a portable electronic device having a battery for obtaining operating power and capable of operating with power from an external power source input to the external power source input terminal. Transforming the voltage to a predetermined voltage when a voltage is applied from, and transforming the voltage from the battery to the predetermined voltage when the voltage is not applied from the external power input terminal, and the external Voltage detecting means for detecting a voltage applied to a power input terminal, switching means for switching whether or not the predetermined voltage is supplied to the inside as operating power, and the portable electronic device being carried Discriminating means for discriminating whether it is used or not used, and during operation, the voltage detecting means detects that no voltage is applied to the external power supply input terminal If the determination means determines that the portable electronic device is carried and used, the switching means is controlled to be switched so that the predetermined voltage is supplied as operating power to the portable electronic device. And a control unit that controls the switching unit so that the predetermined voltage is not supplied to the inside as operating power when the determination unit determines that the electronic device is used without being carried.

  According to this configuration, when the power from the external power source is not input during operation, the voltage from the battery is determined when the determination unit determines that the portable electronic device is carried and used. Since the predetermined voltage transformed by the transforming means is supplied to the inside as operating power, the operation of the portable electronic device is continued, whereas when the portable electronic device is used without being carried, When the determination means determines, the predetermined voltage is not supplied to the inside as the operating power, so that the operation of the portable electronic device stops.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the determination means includes connection detection means for detecting whether or not the external power supply is connected to the external power supply input terminal. When the connection detecting means detects that the external power source is connected, it is determined that the portable electronic device is carried and used, and the connection is made when the external power source is not connected. When the detection means detects, it is determined that the portable electronic device is used without being carried.

  According to this configuration, whether or not the external power source is connected to the external power input terminal by the connection detection unit, whether the portable electronic device is used with or without being carried. Can be easily determined.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the control means, after a predetermined delay time from when the voltage detecting means detects that no voltage is applied to the external power input terminal, The switching means is controlled to be switched based on the detection result of the connection detecting means.

  According to this configuration, the control unit recognizes that the external power supply is connected to the external power supply input terminal in a period immediately after the connection between the external power supply and the external power supply input terminal is disconnected. A malfunction that the operation of the portable electronic device stops can be prevented.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the battery is a secondary battery, and the secondary battery is charged with power from an external power source input to the external power input terminal. It is made to be done. According to this configuration, the battery need not be frequently detached for replacement or charging.

  According to a sixth aspect of the present invention, in the second to fifth aspects of the present invention, GPS positioning means for receiving a radio wave from a GPS (Global Positioning System) satellite and measuring a current position, and map information are written. Map reproduction means for reading map information from a storage medium, and the control means displays a map and a current position on a display unit based on measurement data from the GPS positioning means and map information from the map reproduction means. It has a navigation function. According to this configuration, the portable electronic device can be used as a portable navigation device.

  According to the present invention, when power from an external power source is not input during operation, when the portable electronic device is carried and used, the power from the battery becomes the operating power and the operation of the portable electronic device Therefore, when the portable electronic device is used while being disconnected from the external power supply, there is no need to perform troublesome work for restarting such as turning the power on again. Usability is improved.

  In addition, when power from the external power source is not input during operation and the portable electronic device is used without being carried, the power from the battery does not become operating power and the portable Since the operation of the electronic device is stopped, the portable electronic device is not left running with the power of the battery and the battery is not consumed. That is, consumption of the battery is suppressed.

  In addition, according to the present invention, it is possible to easily determine whether the portable electronic device is carried and used without being carried, so that power from the external power source is not input during operation. In such a case, it is possible to easily realize a portable electronic device that continues to operate when the portable electronic device is carried and used, and stops operating when the portable electronic device is used without being carried.

  Further, according to the present invention, since the portable electronic device can be prevented from malfunctioning when the connection with the external power source is disconnected in order to carry and use the portable electronic device, the operation of the portable electronic device is stopped. The reliability of electronic devices is improved.

  In addition, according to the present invention, since it is not necessary to frequently remove and remove the battery for replacement or charging, the usability is improved.

  According to the present invention, the portable electronic device can be used as a portable navigation device.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main configuration of a portable navigation device (portable electronic device) according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a portable navigation device. The portable navigation device 1 includes a control circuit 11, a ROM 12, a RAM 13, a GPS (Global Positioning System) positioning means 14, a map reproducing means 15, a TV receiving means 16, and a display unit 17. The input unit 18 is provided.

  The control circuit 11 controls each unit based on a program written in the ROM 12, and the RAM 13 stores information necessary for the navigation operation, for example, position information of a home or a registered point. The GPS positioning means 14 receives radio waves from GPS satellites, measures the current position, and outputs measurement data to the control circuit 11. Then, the map reproduction means 15 reads the map information from a storage medium (not shown) such as a CD or DVD in which the map information is written, and outputs it to the control circuit 11.

  The TV receiving unit 16 receives a television broadcast, and the input unit 18 gives the input information to the control unit 11 by a user operation. The display unit 17 is a liquid crystal. Based on the information given from the input unit 18, that is, based on the operation of the input unit 18, the map, the current position, the image of the television broadcast received by the TV receiving unit 16, and the like are based on the control of the control circuit 11. It is displayed on the display unit 17. The input unit 18 includes a power switch of the portable navigation device 1. When the input unit 18 is turned on / off, the portable navigation device 1 is activated / stopped. The operation of the portable navigation device 1 will be described later.

  The portable navigation device 1 also includes a rechargeable dry battery 2, an external power input terminal 5, connection detection means 6, and a transformer circuit 10. The external power supply input terminal 5 receives power as operating power of the portable navigation device 1 from an external power supply. In the present embodiment, the external power input terminal 5 has a DC 9 V voltage obtained by converting a DC 12 V voltage, which is a vehicle accessory power supply supplied via the cigar lighter terminal of the vehicle, with a cigar lighter adapter 3 (external power source). And a case where a voltage of DC 10.5 V obtained by converting a voltage of AC 100 V, which is a commercial power source supplied from a room outlet, etc., by a commercial power adapter 4 (external power source) is input. The voltage may not be input, and either case is selected by the user.

  The power from the cigarette lighter adapter 3 and the power from the commercial power adapter 4 are respectively inserted into the portable navigation device 1 provided at the end of the power supply line and the power supply line, and contacted with the external power input terminal 5. It is supplied via a connecting terminal (not shown).

  The connection detection means 6 detects whether or not the cigarette lighter adapter 3 or the commercial power adapter 4 is connected to the external power input terminal 5. For example, the connection detection means 6 is inserted in the portable navigation device 1. It is composed of a sensor that detects a connection terminal by a mechanical contact method, electromagnetic induction, or a non-contact method using light. When the connection terminal inserted in the portable navigation device 1 is detected, the connection terminal A detection signal is supplied to the control circuit 11.

  The connection detection signal from the connection detection means 6 is input to the control circuit 11 when the cigarette lighter adapter 3 or the commercial power adapter 4 is connected to the portable navigation device 1. In this case, it can be said that the portable navigation device 1 is used without being carried.

  On the other hand, the case where the connection detection signal from the connection detection means 6 is not input to the control circuit 11 is a case where the cigarette lighter adapter 3 or the commercial power adapter 4 is not connected to the portable navigation device 1. In this case, it can be said that the portable navigation device 1 is in a situation where it is carried and used.

  That is, the connection detection means 6 can be said to be a determination means for determining whether the portable navigation device 1 is carried and used without being carried.

  When a DC 9 V or DC 10.5 V voltage from the cigarette lighter adapter 3 or the commercial power adapter 4 is input to the external power input terminal 5, the input voltage is applied to the transformer circuit 10. The transformer circuit 10 includes a voltage detection unit 7, a transformation unit 8, and a switching unit 9, and is connected to the rechargeable dry battery 2.

  When a voltage of DC 9 V or DC 10.5 V is applied, the voltage transforming means 8 transforms any given voltage to a predetermined voltage, and the predetermined voltage is portable to each internal circuit or the like via the switching means 9. The navigation device 1 is supplied as an internal power source for operating the navigation device 1, and any given voltage is transformed to DC 7.2 V, which is the battery voltage of the rechargeable dry battery 2, and applied to the rechargeable dry battery 2. Charge.

  Further, when neither DC 9V nor DC 10.5V is applied, the transformer means 8 transforms the DC 7.2V voltage from the rechargeable dry battery 2 to the predetermined voltage, The circuit is supplied as the internal power source. That is, when no voltage is input to the external power input terminal 5, the power from the rechargeable dry battery 2 becomes the operating power.

  In addition, the voltage detection means 7 calculates the voltage applied to the transformer circuit 10, that is, the voltage of DC 7.2V from the rechargeable dry battery 2 and / or the voltage of DC 9V or DC 10.5V from the external power input terminal 5. Detect and output to the control circuit 11. Thereby, the control circuit 11 determines whether or not a voltage is applied to the external power supply input terminal 5 and, if so, whether the voltage is DC 9 V or DC 10.5 V. It can be recognized with an output voltage of 7.

  Further, the switching means 9 is constituted by, for example, an electronic switch that switches between a conductive state and a cut-off state, and operates the portable navigation device 1 with a predetermined voltage from the transformer means 8 based on an instruction from the control circuit 11. It is possible to switch whether to supply to each internal circuit or the like as an internal power supply for this purpose.

  Next, the operation of the portable navigation device 1 having such a configuration will be described. FIG. 2 is a flowchart showing the operation of the portable navigation device 1.

  First, when the input unit 18 is turned on, or when the DC9V or DC10.5V voltage from the cigarette lighter adapter 3 or the commercial power adapter 4 is input to the external power input terminal 5, the control circuit 11 Then, this is recognized from the information provided from the input unit 18 or the output voltage of the voltage detection means 7, and an instruction is given to the switching means 9 to switch the switching means 9 to the conducting state. Thereby, the predetermined voltage transformed by the transformer means 8 is supplied as an internal power source to each internal circuit or the like, and the portable navigation device 1 becomes in an operating state (step S1).

  When in the operating state, the control circuit 11 always monitors the output voltage of the voltage detection means 7 and once the DC 9 V or DC 10.5 V voltage applied to the external power input terminal 5 is no longer applied, That is, it is confirmed whether or not the power supply from the external power source has been cut off (step S2).

  For example, when the output voltage of the voltage detection means 7 includes DC 9 V or DC 10.5 V, the confirmation is performed by setting the external power supply flag provided in the storage unit inside the control circuit 11 to “1” and storing it. When the external power supply flag is “1” and the output voltage of the voltage detection means 7 does not include DC9V and DC10.5V, it is recognized that the power supply from the external power supply is cut off. it can. The external power supply flag is reset to “0” after the control circuit 11 recognizes that the power supply from the external power supply has been cut off and ends predetermined processing based on the recognition.

  When it is confirmed that the power supply from the external power source is not cut off (NO in step S2), the control circuit 11 then turns off the input unit 18 from the information provided from the input unit 18. It is confirmed whether or not (step S3).

  When the input unit 18 is turned off (YES in step S3), the control circuit 11 recognizes this and gives an instruction to the switching unit 9 to switch the switching unit 9 to the cutoff state. As a result, the predetermined voltage transformed by the transformer 8 is not supplied to each internal circuit or the like as an internal power supply, and the portable navigation device 1 stops operating (step S4). If the input unit 18 has not been turned off (NO in step S3), the process returns to step S1 and the operation state continues.

  On the other hand, when it is confirmed that the power supply from the external power supply has been cut off (YES in step S2), the control circuit 11 then determines whether or not the connection detection signal from the connection detection means 6 described above is input. Is confirmed (step S5). At this time, the switching means 9 remains in a conductive state, and a predetermined voltage obtained by transforming the voltage of DC 7.2 V from the rechargeable dry battery 2 by the voltage transforming means 8 is passed through the switching means 9 as an internal power source to each internal circuit or the like. Since it is supplied, the portable navigation device 1 is in an operating state.

  If the connection detection signal from the connection detection unit 6 is not input (NO in step S5), the process proceeds to step S3 to check whether the input unit 18 has been turned off. That is, in this case, the operation state of the portable navigation device 1 continues until the input unit 18 is turned off.

  On the other hand, when the connection detection signal from the connection detection means 6 is input (YES in step S5), the control circuit 11 recognizes this and gives an instruction to the switching means 9 to switch the switching means 9 to the cutoff state. . As a result, the predetermined voltage transformed by the transformer 8 is not supplied to each internal circuit or the like as an internal power supply, and the portable navigation device 1 stops operating (step S4).

  On the other hand, when the connection detection signal from the connection detection means 6 is not input (NO in step S5), the process returns to step S1 and the operation state continues.

  Consider a case where such a portable navigation device 1 is used in a vehicle and is operated by obtaining operating power from an accessory power supply of the vehicle. The external power input terminal 5 is supplied with a DC 9V voltage obtained by converting a DC 12V voltage, which is a vehicle accessory power supply supplied via the vehicle's cigarette lighter terminal, by the cigarette lighter adapter 3.

  At this time, the power from the cigarette lighter adapter 3 is supplied to the power supply line and the terminal of the power supply line, inserted into the portable navigation device 1 and connected to the external power supply input terminal 5 (not shown). ). The connection detection unit 6 detects the connection terminal inserted in the portable navigation device 1 and provides a connection detection signal to the control circuit 11.

  As described above, the portable navigation device 1 according to this embodiment operates when the connection detection signal from the connection detection unit 6 is input to the control circuit 11 when the power supply from the external power supply is cut off. Will stop and the operating state will continue if there is no input. Accordingly, when the accessory power supply is turned off when the user of the portable navigation device 1 leaves the vehicle, the connection detection means is connected to the control circuit 11 when the power supply from the cigarette lighter adapter 3 is cut off. Since the connection detection signal from 6 is input, the operation of the portable navigation device 1 stops. Therefore, since the user stops the operation of the portable navigation device 1 without performing the troublesome work of turning off the power switch provided in the portable navigation device 1, the portable navigation device 1 is stopped. Is left in the vehicle while operating with the electric power of the rechargeable dry battery 2, and the rechargeable dry battery 2 is not consumed. That is, the consumption of the rechargeable dry battery 2 can be suppressed.

  In addition, when the connection terminal inserted into the portable navigation device 1 is pulled out in order to carry the portable navigation device 1 outside the vehicle and use it after arriving at the destination, a cigar lighter is used. Since the connection detection signal from the connection detection means 6 is not input to the control circuit 11 when the power supply from the adapter 3 is cut off, the operating state of the portable navigation device 1 continues. Accordingly, since the operation of the portable navigation device 1 does not stop even if the connection with the accessory power source is disconnected, the power switch of the portable navigation device 1 is operated to turn on the power again when the portable navigation device 1 is used. This eliminates the need for troublesome work and improves usability.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing the configuration of each part and the like without departing from the spirit of the present invention. It is also possible.

  For example, whether or not the connection detection signal from the connection detection unit 6 is input in step S5 is confirmed after a predetermined delay time from when it is confirmed in step S2 that the power supply from the external power source has been cut off. It is good to do so.

  When the power supply from the external power supply is cut off by pulling out the connection terminal that supplies power from the cigarette lighter adapter 3 or the commercial power supply adapter 4, a voltage is applied to the external power supply input terminal 5. Immediately after that, the connection terminal has not yet been disconnected, and the connection detection signal from the connection detection unit 6 may be input to the control circuit 11 depending on the configuration of the connection detection unit 6 and the like. In this case, a malfunction that stops the operation of the portable navigation device 1 occurs, which is to prevent this.

  By providing such a predetermined delay time, it is possible to prevent the occurrence of the malfunction without being affected by how to pull out the connection terminal and the speed at which the connection terminal is pulled out, and even if the connection detection means 6 has a simple configuration. And reliability can be improved.

  Further, the control circuit 11 is supplied to the portable navigation device 1 by setting the voltage supplied from the cigarette lighter adapter 3 to DC9V and the voltage supplied from the commercial power supply adapter 4 to DC10.5V. Whether the external power source is a vehicle accessory power source or a commercial power source can be recognized based on whether the output voltage of the voltage detecting means 7 includes DC 9V or DC 10.5V. Different operations may be performed depending on whether the external power source supplied to the navigation device 1 is an accessory power source or a commercial power source.

  For example, an in-vehicle navigation device having a function of displaying a received television broadcast does not display an image of the received television broadcast when not parked in order to prevent a traffic accident. In the apparatus 1, when the supplied external power source is a commercial power source, an image of a television broadcast received by the TV receiving means 16 is displayed on the display unit 17, but the supplied external power source is a vehicle accessory power source. In some cases, it is preferable not to display the television broadcast image received by the TV receiver 16 on the display unit 17. If it does in this way, traffic accident prevention can be aimed at similarly to the said vehicle-mounted navigation apparatus.

  In this case, even when the supplied external power supply is a vehicle accessory power supply, the control circuit 11 recognizes that the side brake of the vehicle is in a brake state (parking state). If obtained, the television broadcast image received by the TV receiving means 16 can be displayed on the display unit 17.

  In addition, the control circuit 11 indicates that no power is supplied to the portable navigation device 1 from the external power source, and the output voltage of the voltage detection means 7 includes neither DC9V nor DC10.5V but only DC7.2V. Can be recognized. Therefore, when power is not supplied from the external power source to the portable navigation device 1 and the input unit 18 is not operated for a predetermined time or more during operation, the switching means 9 is shut off to stop the operation. It is possible to In this way, it can be prevented that the portable navigation device 1 is left in an operating state and the rechargeable battery 2 is consumed.

  In addition, the battery that supplies operating power to the portable navigation device 1 is not limited to a secondary battery such as the rechargeable dry battery 2, and may be a primary battery. When a primary battery is used, the above-described charging function of the transforming means 8 becomes unnecessary.

  Although the present embodiment is a portable navigation device, the present invention has a battery for obtaining operating power and can operate with power from an external power source input to the external power input terminal. It is possible to apply to portable electronic devices.

It is a block diagram which shows the principal part structure of the portable navigation apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows operation | movement of the portable navigation apparatus shown in FIG.

Explanation of symbols

1 Portable navigation device (portable electronic device)
2 Rechargeable battery (battery)
3 Adapter for cigarette lighter (external power supply)
4 Commercial power adapter (external power supply)
5 External power input terminal 6 Connection detection means (discrimination means)
7 Voltage detection means 8 Transformer means 9 Switching means 10 Transformer circuit 11 Control circuit (control means)
12 ROM
13 RAM
14 GPS positioning means 15 Map reproduction means 16 TV receiving means 17 Display section 18 Input section

Claims (6)

In a portable electronic device having a battery for obtaining operating power and capable of operating with power from an external power source input to an external power input terminal,
A discriminating means for discriminating whether the portable electronic device is carried and used or not carried;
When power from the external power source is not input during operation and the determination means determines that the portable electronic device is carried and used, the power from the battery is used as the operating power. Control means for controlling the power from the battery not to be operating power when the determination means determines that the portable electronic device is used without being carried, and
A portable electronic device characterized by comprising: In a portable electronic device having a battery for obtaining operating power and capable of operating with power from an external power source input to an external power input terminal,
When a voltage is applied from the external power input terminal, the voltage is transformed to a predetermined voltage. When no voltage is applied from the external power input terminal, the voltage from the battery is transformed to the predetermined voltage. Means,
Voltage detection means for detecting a voltage applied to the external power supply input terminal;
Switching means capable of switching whether or not the predetermined voltage is supplied to the inside as operating power;
A discriminating means for discriminating whether the portable electronic device is carried and used or not carried;
When the voltage detection means detects that a voltage is no longer applied to the external power input terminal during operation, the determination means determines that the portable electronic device is carried and used. The switching means is controlled to be switched so that a predetermined voltage is supplied to the inside as operating power. Control means for switching and controlling the switching means so as not to be supplied to the inside,
A portable electronic device characterized by comprising:   The determination means includes connection detection means for detecting whether or not the external power supply is connected to the external power supply input terminal, and the connection detection means detects that the external power supply is connected. If the portable electronic device is determined to be carried and used, and the connection detection means detects that the external power source is not connected, the portable electronic device is used without being carried. The portable electronic device according to claim 1, wherein it is determined that the portable electronic device is selected.   The control means performs switching control of the switching means based on a detection result of the connection detection means after a predetermined delay time from when the voltage detection means detects that a voltage is no longer applied to the external power supply input terminal. The portable electronic device according to claim 3, wherein:   The said battery is a secondary battery, and the said secondary battery is charged with the electric power from the external power supply input into the said external power supply input terminal, The Claim 1 characterized by the above-mentioned. Portable electronic device. A GPS positioning means for receiving a radio wave from a GPS (Global Positioning System) satellite and measuring a current position; a map reproducing means for reading map information from a storage medium in which map information is written; 6. A navigation function for displaying a map and a current position on a display unit based on measurement data from a GPS positioning unit and map information from the map reproduction unit is provided. A portable electronic device according to any one of the above.

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