JP3808479B2 - Power supply device and electronic device - Google Patents

Description

  The present invention relates to a power supply device and an electronic apparatus, and in particular, accurately determines whether a detachable power supply is connected to any one of the power supply lines. The present invention relates to a power supply device and an electronic device that safely supply power.

  In recent years, in electronic devices such as digital still cameras, it has become possible to selectively use a plurality of power sources such as a power source obtained by converting a plurality of various batteries and an AC power source into a DC with an adapter.

  In an electronic device that can use such a plurality of power sources, for example, an AA alkaline manganese battery as a primary battery and a rechargeable Ni-Cd battery (nickel cadmium battery) or a secondary battery such as a lithium battery are used. In electronic devices that can use multiple power sources in this way, the performance of the power source to be used should be used appropriately, and accidents such as smoke, fire, or explosion may occur. In order to prevent this, there is one that determines the type of power source to be used.

  Therefore, conventionally, in an electronic device capable of selectively using a plurality of types of batteries, battery discrimination means for discriminating the type of battery to be used, and switching the battery supply current according to the discrimination result of the battery discrimination means An electronic device having current switching means has been proposed (see Patent Document 1).

  Conventionally, when one of the batteries having substantially the same outer shape but different electrical characteristics is selected and loaded into the battery storage chamber, it is determined which battery is the loaded battery, A camera that displays the loading status has been proposed (see Patent Document 2).

  The applicant previously provided a power storage unit and a DC power input terminal, and in the power storage unit, either a battery power source incorporating a battery or an AC adapter for converting commercial AC into a predetermined DC voltage is provided. There has been proposed an electronic device that can be detachably attached and can be detachably attached, and the DC power input terminal cannot be used when the AC adapter is used, so that the DC power from the DC power input terminal is not applied to the main circuit (see Patent Document 3). ).

  In other words, this conventional technology allows the battery to be charged even when operating with a battery power source, and makes a power supply unit that does not take up space even when operated with a commercial power source, and an abnormal current is applied from the DC power input terminal when the AC adapter is used. This prevents malfunctions and circuit destruction.

Japanese Patent Laid-Open No. 11-084462 JP 2000-19595 A Japanese Patent Laid-Open No. 7-59335

  By the way, conventionally, it is possible to determine the type of a plurality of power supplies, but it is necessary to determine the power supply line in use among the plurality of power supply lines, and to supply power to any one of the plurality of power supply lines. It is not taken into consideration to accurately and quickly determine whether the power supply is connected, and what to do if the power supply line used is wrongly determined. Safety of the equipment, especially smoke, ignition, explosion, etc. Improvement was necessary to prevent the occurrence of abnormalities.

  Therefore, the present invention quickly and accurately discriminates the power supply line being used, and provides a power supply device that is safe even if the power supply line being used is mistakenly identified, and an electronic device equipped with the power supply device. The purpose is to provide.

Specifically, the invention according to claim 1 is a power supply device that can be used by switching a plurality of power supply lines, and whether or not a power supply is connected to any of the plurality of power supply lines. Used power line discriminating means for detecting power, used power line selecting means for selecting one of the plurality of power lines as a power line to be used, and remaining power lines from the power source to the used power line selecting means. A discharge means for discharging the charge,
The power supply line from the power supply to the used power supply line selecting means is discharged to cause the used power supply line determining means to determine the power supply line connected to the power supply, and the used power supply line determining means is determined. It is an object of the present invention to provide a power supply apparatus capable of quickly and accurately discriminating the used power line by causing the used power line selection means to select the used power line as the used power line.
The invention according to claim 2 is a power supply apparatus that can be used by switching a plurality of power supply lines, and uses a power supply that detects whether a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a used power line selecting unit that selects one of the plurality of power lines as a power line to be used; and a discharge that discharges a remaining charge of the power line from the power source to the used power line selecting unit A power source connected to the power source line discriminating unit by discharging a residual charge of at least one power source line among the power source lines from the power source to the power source line selecting unit. By determining the line, and causing the power line selection means to select the power line determined by the power supply line determination means as the power supply line. , And its object is to provide a power supply apparatus capable of quickly and accurately determine the use power lines.

  According to the third aspect of the present invention, it is possible to quickly and more accurately determine the used power supply line by detecting the degree of discharge of the remaining charge on the power supply line from the power supply to the used power supply line selecting means. The object is to provide a power supply.

  According to a fourth aspect of the present invention, there is provided a power supply apparatus that can be used by switching a plurality of power supply lines, wherein the power supply line that detects whether or not a power supply is connected to any of the plurality of power supply lines. A determining unit; a used power line selecting unit that selects one of the plurality of power lines as a power line to be used; and a discharging unit that discharges a remaining charge of the power line after the used power line selecting unit. The remaining power of the power supply line after the used power supply line selecting means is discharged to cause the used power supply line determining means to determine the power supply line connected to the power supply, and the power supply determined by the used power supply line determining means By using the power supply line selection means to select a power supply line as a power supply line, a power supply device that can quickly and accurately determine the power supply line to be used Is an object of the present invention to provide a.

  According to a fifth aspect of the present invention, there is provided a power supply apparatus capable of quickly and more accurately discriminating the used power supply line by detecting the degree of discharge of the remaining charge of the power supply line after the used power supply line selecting means. The purpose is to do.

  The invention according to claim 6 is a power supply device that can be used by switching a plurality of power supply lines, and uses the power supply line to detect whether a power supply is connected to any of the plurality of power supply lines. A power line discriminating means; a power supply line selecting means for selecting one of the plurality of power supply lines as a power supply line; and remaining charges of the plurality of power supply lines from the power supply to the power supply line selecting means. Discharging means for discharging, and discharging means for discharging the remaining charge on the power supply line after the used power supply line selecting means, and discharging the remaining charge on a plurality of power supply lines from the power supply to the used power supply line selecting means, The remaining charge of the power supply line after the used power line selection means is discharged and the remaining charge after the used power line selection means is detected to detect the used power line. By determining the power supply line to which the power supply is connected to the determination unit and causing the power supply line selection unit to select the power supply line determined by the power supply line determination unit as a power supply line, An object of the present invention is to provide a power supply device that can be more accurately discriminated.

The invention according to claim 7 is a power supply apparatus that can be used by switching a plurality of power supply lines, and a power supply line that detects whether a power supply is connected to any of the plurality of power supply lines. Discriminating means, used power supply line selecting means for selecting one of the plurality of power supply lines as a power supply line to be used, and discharging residual charges of the plurality of power supply lines from the power supply to the used power supply line selecting means Discharging means and discharging means for discharging remaining charges on the power supply lines after the used power supply line selecting means, and discharging the remaining charges on the plurality of power supply lines from the power supply to the used power supply line selecting means and the used power supply. The remaining charge of the power supply line after the line selection means is discharged and the remaining charge is detected from the power supply to the used power supply line selection means and the used power supply. The residual power after the in-selection means is detected and the power supply line determination means determines the power supply line connected to the power supply, and the power supply line determined by the power supply line determination means is used as the power supply line. It is an object of the present invention to provide a power supply device that can quickly and more accurately determine the power supply line used by selecting the power supply line selection means.
The invention according to claim 8 is a power supply device that can be used by switching a plurality of power supply lines, and uses a power supply that detects whether a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a used power line selecting unit that selects one of the plurality as a power line; a discharge of residual charges of the plurality of power lines from the power source to the used power line selecting unit; A discharge means for performing at least one of discharge of the remaining charge of the power supply line after the use power line selection means, and detection of a discharge of the remaining charge by the discharge means and a voltage of the power supply line after a predetermined time has elapsed from the start of discharge. The used power line discriminating means discriminates the used power line, and based on the discrimination result of the used power line discriminating means, the used power line selecting means By and a control means for selecting a use power line, and its object is to provide a power supply device that can determine the use power lines quickly and more accurately.
The invention according to claim 9 is a power supply device that can be used by switching a plurality of power supply lines, and uses a power supply that detects whether a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a used power line selecting unit that selects one of the plurality as a power line; a discharge of residual charges of the plurality of power lines from the power source to the used power line selecting unit; Discharge means for performing at least one of discharge of residual charge on power supply line after use power line selection means, and use for the use power line discrimination means by performing discharge of residual charge and detection of residual charge a predetermined number of times Control means for discriminating the power supply line and causing the power supply line selection means to select the power supply line to be used based on the discrimination result of the power supply line discrimination means By there, and its object is to provide a power supply device that can determine the use power lines quickly and more accurately.
According to a tenth aspect of the present invention, the control unit starts at least one of the discharge of the residual charge and the detection of the residual charge before the use power line determination unit determines the use power line. An object of the present invention is to provide a power supply apparatus that can quickly and more accurately determine a power supply line to be used.

According to the eleventh aspect of the invention, the control means executes the discharge of the remaining charge and the detection of the remaining charge in parallel before the use power line discrimination means determines the use power line. An object of the present invention is to provide a power supply device that can quickly and more accurately determine a power supply line to be used.
According to a twelfth aspect of the present invention, the control unit performs the discharge of the remaining charge and the detection of the remaining charge based on a predetermined priority order before the used power line determination unit determines the used power line. An object of the present invention is to provide a power supply device that can quickly and more accurately determine a power supply line to be used.

  According to a thirteenth aspect of the present invention, although the residual charge detected by the residual charge detecting means is lowered to a predetermined set value, the control means can detect the used power line by the used power line discriminating means. When it is not in a state, at least one of the discharge process and the residual charge detection process is stopped, and by causing the power source line selection means to select at least one power source, smoke, ignition, An object of the present invention is to provide a power supply device that can avoid danger such as explosion and improve safety.

  According to a fourteenth aspect of the present invention, the control means further includes error processing means for executing predetermined error processing when an error is recognized within a predetermined setting condition set in advance, and the power supply line used When the power supply line cannot be detected by the determination means, at least one of the discharge process and the remaining charge detection process is stopped, and a predetermined error process is executed by the error processing means. An object of the present invention is to provide a power supply device that can avoid dangers such as smoke, ignition, and explosion due to selection errors and can improve safety.

  According to the fifteenth aspect of the present invention, by using the power supply device according to any one of the first to fourteenth aspects, it is possible to quickly and more accurately determine the power supply line to be used. An object of the present invention is to provide an electronic device that can avoid dangers such as smoke, ignition, and explosion caused by an error in selection of a line and can improve safety.

The power supply apparatus according to claim 1 is a power supply apparatus that can be used by switching a plurality of power supply lines, and uses a power supply that detects whether a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a used power line selecting unit that selects one of the plurality of power lines as a power line to be used; and a discharge that discharges a remaining charge of the power line from the power source to the used power line selecting unit A power supply line connected to the power supply line from the power supply to the used power supply line selecting means, causing the used power supply line discriminating means to determine the power supply line connected to the power supply line. The power source line determined by the line determination unit is selected by the power source line selection unit as a power source line.
The power supply device according to claim 2 is a power supply device that can be used by switching a plurality of power supply lines, and uses a power supply that detects whether a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a power source line selecting unit that selects one of the plurality of power source lines as a power source line to be used; A power source connected to the power source line discriminating unit by discharging a residual charge of at least one power source line among the power source lines from the power source to the power source line selecting unit. The power line determined by the power supply line determining means is selected as the power supply line used by the power supply line selecting means. And butterflies.

  According to a third aspect of the present invention, there is provided a power supply apparatus for detecting a degree of discharge of a remaining charge on a power supply line from the power supply to the power supply line selection unit.

  5. The power supply device according to claim 4, wherein the power supply device can be used by switching a plurality of power supply lines, and the power supply used for detecting whether or not a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a power source line selecting unit that selects one of the plurality of power source lines as a power source line; and a discharging unit that discharges a remaining charge of the power source line after the power source line selecting unit. The power source line after the power source line selection means is discharged, the power source line discriminating means discriminates the power source line connected to the power source, and the power source line discriminating means discriminates The power supply line is selected by the power supply line selection means as a power supply line.

According to a fifth aspect of the present invention, there is provided a power supply device for detecting a degree of discharge of a remaining charge on the power supply line after the power supply line selection means.
The power supply apparatus according to claim 6 is a power supply apparatus that can be used by switching a plurality of power supply lines, and uses a power supply that detects whether a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a power source line selecting unit that selects one of the plurality of power source lines as a power source line to be used; and discharging residual charges of the plurality of power source lines from the power source to the power source line selecting unit Discharging means for discharging, and discharging means for discharging the remaining charges on the power supply lines after the used power supply line selecting means, and discharging and using the remaining charges on a plurality of power supply lines from the power supply to the used power supply line selecting means The residual charge of the power supply line after the power supply line selection means is discharged and the residual charge after the power supply line selection means is detected to detect the power supply line used. To determine the power line the power supply unit is connected, characterized in that to select the use power line selecting means discriminated the power line of the used power line determination means as the use power lines.

The power supply device according to claim 7 is a power supply device that can be used by switching a plurality of power supply lines, and uses a power supply that detects whether a power supply is connected to any of the plurality of power supply lines. A line discriminating unit; a power source line selecting unit that selects one of the plurality of power source lines as a power source line to be used; and discharging residual charges of the plurality of power source lines from the power source to the power source line selecting unit Discharging means for discharging, and discharging means for discharging the remaining charges on the power supply lines after the used power supply line selecting means, and discharging and using the remaining charges on a plurality of power supply lines from the power supply to the used power supply line selecting means The residual charge on the power supply line after the power supply line selecting means is discharged and the residual charge from the power supply to the used power supply line selecting means is detected and used. The residual power after the source line selection means is detected and the power supply line determination means determines the power supply line connected to the power supply, and the power supply line determined by the power supply line determination means is used as the power supply line. The use power line selection means is selected.
9. The power supply device according to claim 8, wherein the power supply device can be used by switching a plurality of power supply lines, and is used to detect whether a power supply is connected to any of the plurality of power supply lines. A power line discriminating means; a used power line selecting means for selecting one of the plurality as a power line to be used; and discharging of residual charges of the plurality of power lines from the power source to the used power line selecting means; Discharging means for performing at least one of discharge of remaining charge on the power supply line after the used power supply line selecting means, and detecting discharge of remaining charge by the discharging means and voltage of the power supply line after a predetermined time has elapsed from the start of discharge. Thus, the used power line discriminating means discriminates the used power line, and the used power line selection is made based on the discrimination result of the used power line discriminating means. Characterized in that it comprises a control means for selecting a use power line stage, the.
The power supply device according to claim 9, wherein the power supply device can be used by switching a plurality of power supply lines, and is used to detect whether a power supply is connected to any of the plurality of power supply lines. A power line discriminating means; a used power line selecting means for selecting one of the plurality as a power line to be used; and discharging of residual charges of the plurality of power lines from the power source to the used power line selecting means; Discharging means for performing at least one of the discharge of the remaining charge of the power supply line after the used power supply line selecting means, and causing the used power supply line determining means to discharge the remaining charge and detect the remaining charge a predetermined number of times. Control means for causing the used power line selection means to select the used power line on the basis of the discrimination result of the used power line discriminating means while discriminating the used power line; Characterized in that it comprises.
The power supply device according to claim 10, wherein the control unit determines the discharge of the remaining charge by the discharge unit and the remaining charge by the remaining charge detection unit before the use power line determination unit determines the use power line. It is characterized by starting at least one of detection.

  The power supply device according to claim 11, wherein the control unit causes the discharge of the residual charge and the detection of the residual charge to be performed in parallel before the use power line discrimination unit determines the use power line. It is characterized by.

  13. The power supply device according to claim 12, wherein the control means determines the discharge of the remaining charge and the detection of the remaining charge based on a predetermined priority order before the use power supply line determination means determines the use power supply line. It is characterized by making it execute.

  The power supply apparatus according to claim 13, wherein the control means performs a discharge process when the remaining power is reduced to a predetermined set value but the use power line discriminating means cannot detect the use power line. And at least one of the residual charge detection and detection processing is stopped, and the power source line selection unit is made to select at least one power source.

  15. The power supply device according to claim 14, wherein the control means includes error processing means for executing a predetermined error process when an error is recognized within a predetermined setting condition set in advance, and the power supply line used When it is not possible to detect the power supply line used by the determination unit, at least one of the discharge process and the remaining charge detection process is stopped, and a predetermined error process is executed by the error processing unit.

  An electronic apparatus according to a fifteenth aspect includes the power supply device according to any one of the first to fourteenth aspects.

According to the power supply device of the first aspect of the invention, the remaining charge of the power supply line from the power supply to the used power supply line selecting means is discharged, and the used power supply line discriminating means is made to discriminate the power supply line to which the power supply is connected. Since the power source line determined by the power source line determining unit is selected by the power source line selecting unit as the power source line, the power source line can be determined quickly and accurately.
According to the power supply device of the second aspect of the present invention, the remaining power of at least one of the power supply lines from the power supply to the used power supply line selecting means is discharged, and the power supply to the used power supply line discriminating means is supplied. Since the connected power supply line is discriminated and the power supply line discriminated by the used power supply line discriminating means is selected as the used power supply line by the used power supply line selecting means, the same effect as in claim 1 can be obtained.

  According to the power supply device of the third aspect of the present invention, since the degree of discharge of the remaining charge on the power supply line from the power supply to the used power supply line selecting means is detected, it is possible to quickly and more accurately determine the used power supply line. it can.

  According to the power supply device of the invention described in claim 4, the used power line discriminating unit discriminates the power source line to which the power source is connected by discharging the remaining charge of the power source line after the used power source line selecting unit and Since the power source line determined by the power source line determining unit is selected by the power source line selecting unit as the power source line, the power source line can be determined quickly and accurately.

  According to the power supply device of the fifth aspect of the present invention, since the degree of discharge of the remaining charge on the power supply line after the power supply line selection means is detected, it is possible to quickly and more accurately determine the power supply line used. .

According to the power supply apparatus of the invention of claim 6 and the power supply apparatus of the invention of claim 7, the residual charges of the plurality of power supply lines from the power supply to the use power supply line selection means are discharged and the use power supply line selection means and thereafter. The remaining power of the power supply line is discharged and the remaining charge is detected, and the power supply line determination unit determines the power supply line connected to the power supply, and the power supply line determined by the power supply line determination unit Since the use power line selection means is selected as the use power line, the use power line can be determined quickly and more accurately.
9. The power supply device according to claim 8, wherein the power supply device can be used by switching a plurality of power supply lines, and is used to detect whether a power supply is connected to any of the plurality of power supply lines. A power line discriminating means; a used power line selecting means for selecting one of the plurality as a power line to be used; and discharging of residual charges of the plurality of power lines from the power source to the used power line selecting means; Discharging means for performing at least one of discharge of remaining charge on the power supply line after the used power supply line selecting means, and detecting discharge of remaining charge by the discharging means and voltage of the power supply line after a predetermined time has elapsed from the start of discharge. Thus, the used power line discriminating means discriminates the used power line, and the used power line selection is made based on the discrimination result of the used power line discriminating means. Since a control means for selectively using the power supply line to the stage, it is possible to determine the use power lines quickly and more accurately.
The power supply device according to claim 9, wherein the power supply device can be used by switching a plurality of power supply lines, and is used to detect whether a power supply is connected to any of the plurality of power supply lines. A power line discriminating means; a used power line selecting means for selecting one of the plurality as a power line to be used; and discharging of residual charges of the plurality of power lines from the power source to the used power line selecting means; Discharging means for performing at least one of the discharge of the remaining charge of the power supply line after the used power supply line selecting means, and causing the used power supply line determining means to discharge the remaining charge and detect the remaining charge a predetermined number of times. Control means for discriminating the used power line and causing the used power line selecting means to select the used power line based on the discrimination result of the used power line discriminating means; Since Eteiru, can be determined using the power line quickly and more accurately.

  According to the power supply device of the tenth aspect of the invention, the control means starts at least one of the discharge of the residual charge and the detection of the residual charge before the use power line discrimination means by the use power line discrimination means. Therefore, it is possible to quickly and more accurately determine the power supply line used.

According to the power supply device of the eleventh aspect of the present invention, the discharge of the residual charge and the detection of the residual charge are executed in parallel by the control means before the use power supply line determination means determines the use power supply line. Therefore, it is possible to quickly and more accurately determine the power supply line used.
According to the power supply device of the twelfth aspect of the present invention, the discharge of the remaining charge and the detection of the remaining charge are set to a predetermined priority order before the control means determines the used power line by the used power line determining means. Therefore, the power supply line to be used can be determined quickly and more accurately.

  According to the power supply device of the thirteenth aspect of the present invention, the remaining charge is reduced to a predetermined set value by the control means, but when the use power supply line discrimination means cannot detect the use power supply line, the discharge is performed. Because at least one of the processing and the residual charge detection processing is stopped and the power source line selection means selects at least one power source, there is a risk of smoke, fire, explosion, etc. due to the wrong power source line selection Can be avoided and safety can be improved.

  According to the power supply device of the fourteenth aspect of the present invention, when the used power supply line discriminating means cannot detect the used power supply line, at least one of the discharge process and the remaining charge detecting process is stopped, and the error processing means. Therefore, it is possible to avoid the danger of smoke, fire, explosion, etc. due to an error in the selection of the power supply line used and to improve safety.

  According to the electronic device of the fifteenth aspect of the present invention, by using the power supply device according to any one of the first to fourteenth aspects of the present invention, it is possible to quickly and more accurately determine the power supply line to be used. As a result, it is possible to avoid dangers such as smoke, ignition, and explosion due to an error in selecting the power supply line to be used, and safety can be improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, since the Example described below is a suitable Example of this invention, various technically preferable restrictions are attached | subjected, However, The scope of the present invention limits this invention especially in the following description. As long as there is no description of the effect, it is not restricted to these aspects.

  1 to 7 are diagrams showing an embodiment of a power supply device and an electronic apparatus according to the present invention, and FIG. 1 is a power supply of an image recording apparatus 1 to which the embodiment of the power supply apparatus and the electronic apparatus according to the present invention is applied. FIG. 3 is a block diagram of the main part of the unit 10.

  In FIG. 1, an image recording apparatus 1 is an electronic apparatus that performs image recording such as a digital still camera, a copying apparatus, and a printer apparatus, and includes a power source unit (power source device) 10 and a plurality of power sources 20 a connected to the power source unit 10. 20n and other units 30 such as a display unit and a sound unit to which power is supplied from the power supply unit 10 are provided.

  The power supply unit 10 includes a number of discharge circuits (discharge means) 11a to 11n corresponding to the number of power supplies 20a to 20n, a determination circuit (use power line determination means) 12, a selection unit (use power line selection means) 13, and a discharge circuit. (Discharge means) 14, a detection circuit (residual charge detection means) 15, a control unit (control means) 16, and the like.

  The selection unit 13 includes a number of selection circuits 13a to 13n corresponding to the number of the power sources 20a to 20n. The selection units 13 are connected to the power sources 20a to 20n through the power supply lines, respectively, and are connected to the other units 30 with one unit. The power supply power is supplied to the other units 30 from the power supply connected to any one of the selected power supplies 20a to 20n.

  The discriminating circuit 12 discriminates whether or not each power source 20a to 20n is attached with a power source, and outputs a discrimination result to the control unit 16. The control unit 16 selects the selection circuit 13a based on the discrimination result of the discriminating circuit 12. To 13n and the discharge circuits 11a to 11n are controlled to perform selection control and discharge control of the power supply lines connected to the power supplies 20a to 20n, respectively.

  The discharge circuits 11a to 11n are connected between the power sources 20a to 20n and the selection circuits 13a to 13n of the selection unit 13, and are turned on / off under the control of the control unit 16 so that the power sources 20a to 20n and The remaining charges on the power supply lines of the power supplies 20a to 20n are discharged. The residual charge here means, for example, a charge accumulated in a C component (a capacitor component or a component equivalent to a capacitor) such as a 60 μF capacitor shown in FIG. The residual charge is not limited to that stored in the 60 μF capacitor.

  The discharge circuit 14 is connected between the selection unit 13 and the other unit 30, is turned on / off under the control of the control unit 16, and is a power line between the selection unit 13 and the other unit 30. The remaining charge of is discharged.

  Under the control of the control unit 16, the detection circuit 15 detects the presence or absence of the remaining charge on the power supply line from the selection unit 13 to the other unit 30, and outputs the remaining charge detection result to the control unit 16. Controls the discharge operation of the discharge circuit 14 based on the residual charge detection result of the detection circuit 15.

  The control unit 16 includes, for example, a CPU (Central Processing Unit), a program for controlling operations of the image recording apparatus 1 and the power supply unit 10, a ROM (Read Only Memory) and a RAM (Random Access Memory) for storing necessary data, and the like. And the CPU controls each part of the image recording apparatus 1 using the RAM as a work memory based on a program in the ROM, executes processing as the image recording apparatus 1, and controls each part of the power supply unit 10. Then, a power control process described later is executed.

  The power supply unit 10 includes lithium batteries, AA batteries, AC adapters, and the like as the power supplies 20a to 20n. For example, when a lithium battery is attached to the power supply 20a and an AA battery is attached to the power supply 20b, FIG. The power sources 20a and 20b are connected to the UNREG1 to which the other unit 30 as a load is connected via the selection circuits 13a and 13b of the selection unit 13, and the power source 20a of the lithium battery is connected. A discharge circuit 14 is connected to the power supply line downstream of the selection circuit 13a, that is, between the selection circuit 13a and UNREG1, and the power supply line of the AA battery is connected to the power supply line 20b from the selection circuit 13b. A discrimination / discharge circuit in which the discrimination circuit 12 and the discharge circuit 11b are integrated is connected upstream, that is, between the selection circuit 13b and the power source 20b. .

  Each of the selection circuits 13a and 13b is turned on / off by, for example, small signal amplification transistors Q1a and Q1b (2SC4081 and the like) for amplifying the control signals DCCTL_DIV and DCCTL_T3 from the control unit 16 and the operations of the transistors Q1a and Q1b. Further, MOSFETs (Field Effect Transistors) Q2a and Q2b for connecting / cutting off the power source 20a of the lithium battery and the power source 20b of the AA battery are provided, and control from the control unit 16 to the transistors Q1a and Q1b is provided. MOSFETs Q2a and Q2b are turned on / off by signals DCCTL_DIV and DCCTL_T3 to connect / cut off the power supply line.

  In the MOSFETs Q2a and Q2b, the direction of the parasitic diodes is opposite to the UNREG1 direction as the load from the power sources 20a and 20b.

  The discharge circuit 14 includes a small signal amplification transistor Q3 and the like. The transistor Q3 is turned on in response to the discharge signals (BAT_DIS, BAT_TEST) from the control unit 16, and the remaining charge of the power supply line after the selection circuit 13a is reduced. Discharge.

For example, the determination circuit 12 uses epitaxial planar transistors Q4 and Q5 in FIG. 4, and starts a determination operation in response to a test signal BAT_DIV (or BAT_T3) from the control unit 16 to detect a plurality of power supply lines. It is determined which power line is connected to the power source, and the determination result is output to the control unit 16 and a signal BAT_DIV (BAT_T3) indicating the power line to which the power is connected (used power line) is output. A control signal is input to the collector of the transistor Q6 of the discharge circuit 11b, and a control signal is input to the base of the discharge circuit 11b according to the determination result.
Since the type of power source and the power line connected to each type of power source are predetermined, the type of power source such as whether the connected power source is a lithium battery or an AA battery is secondary. In this sense, the signal BAT_DIV (BAT_T3) is also a signal indicating the type of power supply.

  The discharge circuit 11b is turned on according to the determination result of the determination circuit 12, and discharges the charge of the AA battery mounted on the power source 20b and the power line from the AA battery to the selection circuit 13a.

  The signal BAT_KIND changes from high (H) to low (L) when, for example, an AA battery is attached to the power source 20b and high (H) is input, and the discharge circuit 11b is turned on. When no AA battery is attached to 20b, it remains high (H).

  As shown in FIG. 2, the power supply unit 10 has a discharge circuit on the side of the power supply 20a to which the lithium battery is mounted connected downstream of the selection circuit 13a, that is, between the selection circuit 13a and UNREG1. However, the discharge circuit on the power supply 20a side may be a discharge circuit 11a connected between the power supply 20a and the selection circuit 13a as shown in FIG. The configuration of the discharge circuit 11a itself is the same as that of the discharge circuit 14, and discharges the charge of the AA battery attached to the power supply 20b and the power supply line from the AA battery to the selection circuit 13a.

  Further, as shown in FIGS. 2 and 3, the power supply unit 10 is not limited to the one in which the discharge / discrimination circuit is connected only to the power supply 20b side where the AA battery is mounted. As shown in FIG. 5, the discrimination / discharge circuit in which the discrimination circuit 12 and the discharge circuit 11a are integrated is upstream of the selection circuit 13a, that is, between the selection circuit 13a and the power source 20a, or downstream of the selection circuit 13a. It may be connected to the side. The discrimination circuit 12 of this discrimination / discharge circuit has the same configuration as that of the discrimination circuit 12 connected to the power source 20b side in FIGS. 2 and 3, and the same reference numerals are given and description thereof is omitted. The discharge circuit 11a has the same configuration as that of the discharge circuit 11a of FIG. 3, and the same reference numerals are given and description thereof is omitted.

  Further, the power supply unit 10 uses, as the selection circuits 13a and 13b, parasitic diodes of the MOSFETs Q2a and Q2b in opposite directions to the power supplies 20a and 20b, but as shown in FIG. MOSFETs Q12a and Q12b which are forward from the power sources 20a and 20b in the direction of the load UNREG1 may be used. In this case, the load UNREG1 is opposite to the load direction between the selection circuits 13a and 13b. It is necessary to provide a selection circuit 40 having a MOSFET Q42 serving as a parasitic diode in the direction. The selection circuit 40 is basically the same as the other selection circuits 13a and 13b, and a small signal amplification transistor Q41 (2SC4081 and the like) for amplifying the control signals DCCTL_DIV, DCCTL_T3 and the like from the control unit 16 and the transistor. MOSFET Q42 etc. which turn on / off by the operation of Q41 and connect / cut off the outputs of the selection circuits 13a and 13b and UNREG1 on the load side are provided.

  Next, the operation of this embodiment will be described. The image recording apparatus 1 having the power supply unit 10 of the present embodiment can be mounted with various power sources such as AA batteries and lithium batteries (Li batteries) on a plurality of types of power sources 20a to 20n, and connected to such various power sources. It is possible to accurately determine which power supply line is attached to each of the power supply lines, and to ensure safety even if the determination is incorrect.

  In the following description, for simplicity of explanation, a power source 20a to which a lithium battery is attached (a power line connected to the power source 20a to which the lithium battery is attached) and an AA battery are attached as power sources. A power source 20b (a power line connected to the power source 20b to which the AA battery is mounted) will be described.

  That is, as shown in FIG. 6, when either one of a lithium battery or an AA battery is attached (inserted) to the power supply 20a or the power supply 20b (step S101), the power supply unit 10 The sub CPU (SUB CPU) is reset (step S102), and the power supply voltage is read while discharging the remaining charge of the power supply line to the discharge circuit 11a and the discharge circuit 14 or the discharge circuit 11a and the discharge circuit 11b ( Step S103), the number of readings or the elapsed time is counted (Step S104). In the following description, description will be made based on the number of reading times.

When the number of readings is counted, the control unit 16 checks whether the number of readings is equal to or less than a predetermined number (predetermined value) set in advance (step S105). For the residual charge stored in the C component of the circuit component described in paragraph 0047, for example, the residual charge stored in a 60 μF capacitor, which is the C component shown in FIG. 2, the maximum amount of residual charge is the capacitance of the C component. Therefore, the discharge can be performed by dividing the predetermined number of times. Thus, if it discharges by dividing into predetermined times, it will be discharged at a time, and there is no possibility that a large current will flow and a circuit may fail. In addition, since the number of readings can be set in advance and the maximum amount of residual charge of the C component can be theoretically predicted, the amount of discharge per time in the circuit is determined in advance, so the number of discharges is counted. By doing so, it can be determined whether or not the remaining charge is equal to or less than a predetermined amount.
If the predetermined number of times has not been reached in step S105, it is checked whether the power supply voltage is equal to or lower than a predetermined voltage (predetermined value) set in advance (step S106).
Each time the battery is discharged, the power supply voltage is read, and if this voltage is compared with a predetermined voltage, the residual charge in the power supply line used can be detected, and the residual charge can be detected by reading the power supply voltage. .
Here, the significance of detecting the residual charge will be described. If the remaining charge remains, there is a risk of selecting a power supply line that uses a power supply line different from the power supply line connected to the power supply to which the power supply is attached. Therefore, as described in paragraphs 0046 and 0048, the discharge circuits 11 and 14 discharge.

  When it is not less than or equal to the predetermined value in step S106, the control unit 16 returns to step S104 and performs the same processing as described above from the count of the number of readings, and checks whether the number of readings reaches the predetermined value or the power supply voltage reaches the predetermined value. (Steps S104 to S106) When the number of readings reaches a predetermined value in Step S105, or when the power supply voltage becomes equal to or lower than the predetermined value in Step S106, the control unit 16 has a plurality of power supply lines (here, two power lines). The power source line) is started to determine which power source is connected, in other words, the power source type (lithium battery or AA battery) is determined ( Step S107) After waiting for a predetermined time (predetermined value) set in advance (step S108), the discriminant value is read (step S109), and the power supply Stop determination (step S110), whether the power line power is connected in the range of any of the power supply line, i.e., where checks whether the AA batteries (step S111).

  In step S111, when a lithium battery is attached to the power source 20a, the control unit 16 controls the selection circuits 13a and 13b to use the power source line connected to the power source 20a as the power source line. The selection circuit 13a for selecting the power supply line connected to the power supply 20a to which the battery is attached is turned on, the lithium battery is connected to the other unit 30 as a load, and the power supply control process is finished (step) S112).

In step S111, when the lithium battery is not attached, the control unit 16 determines that the AA battery is attached to the power source 20b, and controls the selection circuits 13a and 13b, so that the AA battery is installed. The selection circuit 13b for selecting the power supply line connected to the power supply 20b to be mounted is turned on, the AA battery is connected to the other unit 30 as a load, and the power supply control process is ended (step S113). .
When counting the elapsed time described in paragraph 0063 (step S104), the discharge time is determined and the maximum amount of residual charge of the C component can be theoretically predicted. The amount of discharge in the discharge time interval is determined in advance. That is, it can be determined how long the remaining charge has become equal to or less than a predetermined voltage value. Thus, the presence or absence of residual charge can also be determined by the elapsed time from the start of discharge.

  Even when the number of readings reaches a predetermined value in step S105, the determination of the power line used starts and the process moves to the connection process of the power line when the remaining charge is not completely discharged or The discharge circuit does not function, the detection circuit does not function, the determination circuit or the selection unit does not function, etc., and there is a failure, the remaining charge is unknown, or the determination circuit is connected to multiple power supplies When it is determined that the number of readings reaches a predetermined value, the discharge operation and the detection operation are stopped, the process proceeds to the connection process of the power supply line, the energization to the power supply unit 10 is performed reliably, and the operation To improve usability.

  Further, in the image recording apparatus 1 having the power supply unit 10 of the present embodiment, when the power supply voltage read count reaches a predetermined number (predetermined value) before the power supply voltage read in the power supply control process falls below a predetermined value, It may be handled as an error.

  That is, as shown in FIG. 7, in the power supply unit 10, when a lithium battery or an AA battery is attached (inserted) to the power supply 20a or the power supply 20b (step S201), the control unit 16 becomes a sub CPU (SUB CPU). Is reset (step S202), and the power supply voltage is read while discharging the remaining charge on the power supply line to the discharge circuit 11a and the discharge circuit 14 or the discharge circuit 11a and the discharge circuit 11b (step S203). Alternatively, the elapsed time is counted (step S204). In the following description, description will be made based on the number of reading times.

  When the number of readings is counted, the control unit 16 checks whether the number of readings is equal to or less than a predetermined number (predetermined value) set in advance (step S205). It is checked whether the voltage is equal to or lower than a predetermined voltage (predetermined value) set in advance (step S206).

  If it is not less than or equal to the predetermined value in step S206, the control unit 16 returns to step S204 and performs the same processing from the number of readings as described above to check whether the number of readings reaches the predetermined value or whether the power supply voltage reaches the predetermined value. (Steps S204 to S206) When the number of readings reaches the predetermined value in Step S205 before the power supply voltage becomes equal to or lower than the predetermined value in Step S206, the control unit 16 It is determined that detection is impossible, error processing is executed, and the process is terminated (step S207). This error processing includes, for example, stopping the sequence after an error, displaying an error warning on an LCD (Liquid Crystal Display) or LED (Light Emitting Diode) in the display unit, or an error warning sound by a speaker or buzzer in the audio unit And output error warning messages. When the user cancels the error according to the error process and the battery (power supply) is inserted again, the control unit 16 starts the power control process again from the process of step S201. As this error cancellation processing, for example, insertion / extraction of a battery (power supply), pressing of a reset button, and the like are performed.

  If the power supply voltage becomes equal to or lower than the predetermined value in step S206 before the number of readings reaches the predetermined value in step S205, the control unit 16 selects one of a plurality of power supply lines (here, two power supply lines). Determination of which power line is connected to the power source is started, in other words, determination of the type of power source (lithium battery or AA battery) is started (step S208). After waiting for the set predetermined time (predetermined value) (step S209), the discrimination value is read (step S210), the discrimination of the power supply voltage is stopped (step S211), and the power supply line to which the power supply is connected is determined. It is checked which power supply line, that is, here, an AA battery (step S212).

  In step S212, when a lithium battery is attached to the power source 20a, the control unit 16 controls the selection circuits 13a and 13b to set the power source line connected to the power source 20a as the use power source line. The selection circuit 13a for selecting the power supply line connected to the power supply 20a to which the battery is attached is turned on, the lithium battery is connected to the other unit 30 as a load, and the power supply control process is finished (step) S213).

  In step S212, when the lithium battery is not attached, the control unit 16 determines that the AA battery is attached to the power source 20b, and controls the selection circuits 13a and 13b to determine whether the AA battery is attached. The selection circuit 13b for selecting the power supply line connected to the power supply 20b to be mounted is turned on, the AA battery is connected to the other unit 30 as a load, and the power supply control process is finished (step S214). .

  As described above, in the image recording apparatus 1 including the power supply unit 10 according to the present embodiment, the power supply unit 10 uses one of the power supply lines connected to the plurality of power supplies 20a to 20n as a use power supply line. Out of a plurality of power supply lines up to the selection unit 13 to be selected or one power supply line after the selection unit 13, the discharge of the residual charges of the power supply lines not attached to the power supplies 20 a to 20 n or all the power supply lines is discharged. The circuits 11a to 11n perform a predetermined time or a predetermined voltage, and the determination circuit 12 determines the power supply line connected to the power supply to which the power supply is mounted among the power supply lines connected to the power supplies 20a to 20n. Then, the selection unit 13 selects the power supply line connected to the power supplies 20a to 20n determined by the determination circuit 12 as the use power supply line.

  Therefore, it is possible to quickly and accurately determine which power supply line is connected to any of the power supply lines connected to the power supplies 20a to 20n. By selecting a power supply line connected to the power supplies 20a to 20n not mounted with power, safety can be improved only when power is not supplied and operation is not performed.

  Further, the image recording apparatus 1 including the power supply unit 10 according to the present embodiment selects one of the power supply lines connected to the plurality of attachable power supplies 20a to 20n as the use power supply line. Among the power supply lines up to or after the selection unit 13, the discharge of the residual charges of the power supply lines to which the power supplies 20a to 20n are not connected or all of the power supply lines is discharged to a predetermined time or a predetermined voltage by the discharge circuits 11a to 11n. Then, the detection circuit 15 detects the remaining charge of the power supply line from the power supplies 20a to 20n to the selection unit 13 or the power supply line after the selection unit 13, and the determination circuit 12 refers to the detected remaining charge and supplies the power supply 20a. To determine which power line is connected to the power lines connected to 20n, and the selection unit 13 determines the determination circuit 12 And you have selected the power line as using power line.

  Therefore, it is possible to quickly and more accurately determine which of the power supply lines connected to the power supplies 20a to 20n is connected to the power supply line. The selection unit 13 selects a power supply line to which no power is connected, and only the power is not supplied and the operation is not performed, so that safety can be improved.

  Furthermore, the image recording apparatus 1 including the power supply unit 10 according to the present embodiment determines which power supply line is connected to the power supply line connected to the power supplies 20a to 20n by the determination circuit 12. Before performing the above, discharging of the remaining charge by the discharge circuits 11a to 11n and detection of the remaining charge by the detection circuit 15 are started.

  Therefore, unnecessary consumption of the power source mounted on the power sources 20a to 20n can be prevented to save power, and at least the remaining charge is eliminated before the power source determination is performed or the voltage is reduced to a predetermined voltage. Thus, accurate power supply discrimination can be performed.

  Further, the image recording apparatus 1 including the power supply unit 10 according to the present embodiment performs the discharge of the remaining charge by the discharge circuits 11a to 11n and the detection of the remaining charge by the detection circuit 15 in parallel or with a predetermined priority. Running on the basis.

  Therefore, for example, if the residual charge is detected first and the residual charge is exhausted or has decreased to a predetermined voltage, it is not necessary to perform the discharge operation, and the power supply is determined more efficiently. In addition, when the discharge operation and the detection operation are performed simultaneously, the remaining charge is discharged and detected in the shortest time, and the power supply line to be used can be determined more quickly and accurately.

  Further, in the image recording apparatus 1 including the power supply unit 10 according to the present embodiment, when the remaining charge detected by the detection circuit 15 is lowered to a predetermined set value, the discharge is performed when the determination circuit 12 is not in a power supply detectable state. The discharge processing by the circuits 11a to 11n and the detection processing by the detection circuit 15 are stopped, and the selection unit 13 selects at least one power supply line to be used.

  Therefore, it is possible to reliably energize the power supply unit 10, enable operation, and improve usability.

  In addition, the image recording apparatus 1 including the power supply unit 10 according to the present embodiment performs the discharge process by the discharge circuits 11a to 11n when the power supply can be detected by the determination circuit 12 within a predetermined setting condition set in advance. Detection processing by the detection circuit 15 is stopped, and predetermined error processing is executed.

  Therefore, danger can be avoided and safety can be further improved.

  In the above embodiment, the case where the discharge circuits 11a to 11n and the discharge circuit 14 are provided and the detection circuit 15 is provided only between the selection unit 13 and the other unit 30 has been described. In place of .about.11n, a detection circuit similar to the detection circuit 15 is provided, and the detection circuit 15 detects the remaining charges on the power supply line from the power sources 20a to 20n to the selection unit 13 or the power supply line after the selection unit 13, and a discrimination circuit. 12 determines whether the power source is connected to any one of the power supply lines connected to the power sources 20a to 20n with reference to the detected residual charge, and the selection unit 13 determines Of the power supplies 20a to 20n determined by the circuit 12, a power supply line to which a power supply is connected may be selected as the use power supply line.

  Therefore, it is possible to determine whether the power source is attached to any one of the plurality of power source lines connected to the power sources 20a to 20n at a lower cost and more quickly and accurately. If the selection unit 13 selects the power sources 20a to 20n to which no power source is connected, the power source is not supplied and the operation is not performed, so that safety can be improved.

  The invention made by the present inventor has been specifically described based on the preferred embodiments. However, the present invention is not limited to the above, and various modifications can be made without departing from the scope of the invention. Needless to say.

  A power supply device in which a plurality of types of power supplies are detachably mounted, a power supply line connected to the power supply to which the power supply is attached is accurately determined, and an appropriate power supply is provided, and a digital still camera and printer having the power supply device The present invention can be applied to an electronic apparatus such as an image recording apparatus.

1 is a block diagram of a main part of a power supply unit of an image recording apparatus to which an embodiment of a power supply device and an electronic apparatus of the present invention is applied. The circuit block diagram of a power supply part in case a mounting power supply is a lithium battery and an AA battery. The circuit block diagram of a power supply part in case the discharge circuit by the side of the lithium battery of FIG. 2 is connected to the lithium battery side rather than the selection circuit. FIG. 4 is a circuit configuration diagram of a power supply unit when the discharge circuit of FIG. 3 also includes a determination circuit. The circuit block diagram of a power supply part in case the parasitic diode of MOSFET of a selection circuit is a forward direction with respect to a load direction. The flowchart which shows the power supply control process by the power supply part of FIG. The flowchart which shows the power supply control process accompanied by the error process by the power supply part of FIG.

Explanation of symbols

1 Image recording device (electronic equipment)
DESCRIPTION OF SYMBOLS 10 Power supply part 11a-11n Discharge circuit (discharge means)
12 Discriminating circuit (Power supply line discriminating means)
13 Selection unit (use power line selection means)
13a, 13b selection circuit 14 discharge circuit (discharge means)
DESCRIPTION OF SYMBOLS 15 Detection circuit 16 Control part 20a-20n Power supply 30 Other units Q1a, Q1b, Q3, Q41 Transistor Q2a, Q2b, Q42 MOSFET

Claims (15)

A power supply apparatus that can be used by switching between a plurality of power supply lines, wherein a power supply line determination unit that detects whether a power supply is connected to any of the plurality of power supply lines; and the plurality of power supplies Use power line selection means for selecting one of the lines as a power supply line to be used, and discharge means for discharging a remaining charge of the power supply line from the power supply to the use power line selection means,
The power supply line from the power supply to the used power supply line selecting means is discharged to cause the used power supply line determining means to determine the power supply line connected to the power supply, and the used power supply line determining means is determined. A power supply apparatus that causes the power supply line selection means to select the power supply line as a power supply line. A power supply apparatus that can be used by switching between a plurality of power supply lines, wherein a power supply line determination unit that detects whether a power supply is connected to any of the plurality of power supply lines; and the plurality of power supplies Use power line selection means for selecting one of the lines as a power supply line to be used, and discharge means for discharging a remaining charge of the power supply line from the power supply to the use power line selection means,
Letting the used power line discriminating unit determine the power line to which the power source is connected by discharging the remaining charge of at least one of the power lines from the power source to the used power line selecting unit; A power supply apparatus that causes the power supply line selection means to select a power supply line determined by a power supply line determination means as a power supply line.   The power supply apparatus according to claim 1 or 2, wherein a degree of discharge of a remaining charge on a power supply line from the power supply to the used power supply line selection unit is detected. A power supply apparatus that can be used by switching between a plurality of power supply lines, wherein a power supply line determination unit that detects whether a power supply is connected to any of the plurality of power supply lines; and the plurality of power supplies A power supply line selection means for selecting one of the lines as a power supply line to be used; and a discharge means for discharging a remaining charge of the power supply line after the power supply line selection means,
The remaining power of the power supply line after the used power supply line selecting means is discharged to cause the used power supply line determining means to determine the power supply line connected to the power supply, and the power supply line determined by the used power supply line determining means The power supply apparatus is configured to cause the power supply line selection means to select the power supply line as a power supply line.   5. The power supply device according to claim 4, wherein a degree of discharge of a remaining charge on the power supply line after the power supply line selection means is detected. A power supply apparatus that can be used by switching between a plurality of power supply lines, wherein a power supply line determination unit that detects whether a power supply is connected to any of the plurality of power supply lines; and the plurality of power supplies A power supply line selection means for selecting one of the lines as a power supply line to be used; a discharge means for discharging residual charges of a plurality of power supply lines from the power supply to the power supply line selection means; and the power supply line used Discharge means for discharging the remaining charge of the power supply line after the selection means,
The discharge of the remaining charges of the plurality of power supply lines from the power supply to the used power supply line selecting means and the discharge of the remaining charges of the power supply lines after the used power supply line selecting means are performed and the remaining charges after the used power supply line selecting means are performed. Detecting electric charge, causing the power supply line determination means to determine the power supply line to which the power supply is connected, and causing the power supply line selection means to select the power supply line determined by the power supply line determination means. A power supply device characterized by that. A power supply apparatus that can be used by switching between a plurality of power supply lines, wherein a power supply line determination unit that detects whether a power supply is connected to any of the plurality of power supply lines; and the plurality of power supplies A power supply line selection means for selecting one of the lines as a power supply line to be used; a discharge means for discharging residual charges of a plurality of power supply lines from the power supply to the power supply line selection means; Discharge means for discharging the remaining charge of the power supply line after the selection means,
The discharge of residual charges on a plurality of power supply lines from the power supply to the used power supply line selection means and the discharge of residual charges on the power supply lines after the use power supply line selection means are performed and the use power supply line selection means from the power supply. Detection of the remaining charge up to and detection of the remaining charge after the used power supply line selection means to make the used power supply line discriminating means discriminate the power supply line connected to the power supply, A power supply apparatus that causes the power supply line selection means to select a determined power supply line as a power supply line to be used.   A power supply apparatus that can be used by switching between a plurality of power supply lines, wherein the power supply line determination means detects whether a power supply is connected to any of the plurality of power supply lines, and the plurality of power supply lines Use power line selection means for selecting one of them as a power supply line, discharge of residual charges of the plurality of power supply lines from the power supply to the use power line selection means, and power supply after the use power line selection means A discharge means for performing at least one of discharge of the remaining charge on the line; and a discharge of the remaining charge by the discharge means and a voltage of the power supply line after a predetermined time has elapsed from the start of the discharge to the used power supply line determination means. The used power line is discriminated and the used power line is selected by the used power line selecting means based on the discrimination result of the used power line discriminating means. Power supply, characterized in that it comprises a control means, a to.   A power supply apparatus that can be used by switching between a plurality of power supply lines, wherein the power supply line determination means detects whether a power supply is connected to any of the plurality of power supply lines, and the plurality of power supply lines Use power line selection means for selecting one of them as a power supply line, discharge of residual charges of the plurality of power supply lines from the power supply to the use power line selection means, and power supply after the use power line selection means A discharge means for performing at least one of a discharge of the residual charge on the line, a discharge of the residual charge and a detection of the residual charge for a predetermined number of times, causing the power supply line determination means to determine the power supply line to be used and Control means for causing the power supply line selection means to select a power supply line to be used based on a determination result of the power supply line determination means. Power supply.   9. The control unit according to claim 8, wherein the control unit starts at least one of discharge of the remaining charge and detection of the remaining charge before determining the used power line by the used power line determining unit. Item 10. The power supply device according to Item 9.   9. The control unit according to claim 8, wherein the control unit causes the discharge of the residual charge and the detection of the residual charge to be performed in parallel before the determination of the power supply line used by the power supply line determination unit. Item 10. The power supply device according to Item 9.   The control means performs discharge of the remaining charge and detection of the remaining charge by the discharging means based on a predetermined priority order before determining the used power line by the used power line determining means. The power supply device according to claim 8 or 9, wherein the power supply device is characterized.   The control means has at least one of a discharge process and a residual charge detection process when the residual charge has fallen to a predetermined set value but is not in a state where the use power line can be detected by the use power line discrimination means. The power supply apparatus according to claim 8 or 9, wherein the power supply line selection unit selects at least one power supply.   The control means further comprises an error processing means for executing a predetermined error process when an error is recognized within a predetermined setting condition set in advance, and detecting a used power line by the used power line discriminating means. 10. The method according to claim 8, wherein at least one of a discharge process and a residual charge detection process is stopped and a predetermined error process is executed by the error processing unit when the state is not possible. Power supply.   An electronic apparatus comprising the power supply device according to any one of claims 1 to 14.

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