JP2021118627A - Electronic apparatus - Google Patents

Abstract

To prevent a battery protection circuit from malfunctioning in an electronic apparatus that operates on power supplied from a battery.SOLUTION: An electronic apparatus includes a main load unit that can operate with power supplied from a battery, charging means that charges the battery with power supplied from an external power supply device, a switch connected between the charging means and the battery, and control means that controls the charging means, the switch, and the main load unit, and when the battery is charged, the control means activates the charging means and conducts the switch such that the battery is charged by the power supplied from the external power supply device, and when the charging of the battery is completed, the charging means is maintained in a rechargeable state and the switch is shut off.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electronic device that operates on electric power supplied from a battery.

Patent Document 1 describes a method for preventing the input voltage to the load circuit from dropping by supplying power from the battery to the load via a diode when the current consumption of the load exceeds the power supply capacity of the AC adapter. Has been done.

Japanese Unexamined Patent Publication No. 2010-166637

In the method described in Patent Document 1, when a general-purpose AC adapter is used, the change in the battery voltage when a load is generated differs depending on the difference in the power supply capacity of the AC adapter, so that the remaining battery level can be accurately determined. There is a problem that it is difficult.

Further, in the method described in Patent Document 1, if the power supply from the AC adapter is cut off when the remaining battery level is low, the battery voltage may drop sharply and the battery protection circuit may malfunction. ..

Therefore, an object of the present invention is to make it possible to prevent a situation in which a battery protection circuit malfunctions in an electronic device that operates with electric power supplied from a battery.

The electronic device according to the present invention includes a main load unit that can operate with the electric power supplied from the battery, a charging means for charging the battery with the electric power supplied from the external power supply device, and the charging means and the battery. It has a switch connected between the charging means, the switching means, and a control means for controlling the switch and the main load unit, and the control means activates the charging means when the battery is charged. By conducting the switch, the battery is charged by the electric power supplied from the external power supply device, and when the charging of the battery is completed, the charging means is maintained in a rechargeable state. To shut off the switch.

According to the present invention, it is possible to prevent a situation in which a battery protection circuit malfunctions in an electronic device that operates with electric power supplied from the battery.

It is a block diagram for demonstrating the component | component of the electronic device 100 and the external power feeding device 130 in Embodiment 1. FIG. It is a timing chart for demonstrating the operation of the electronic device 100. It is a flowchart for demonstrating the operation of the electronic device 100. It is a flowchart for demonstrating the flash photography determination process. It is a flowchart for demonstrating the battery level determination process. It is a flowchart for demonstrating flash photography control. It is a block diagram of the electronic device 700, the external power supply device 130, and the portable device in the second embodiment. It is a block diagram of the electronic device 700, the external power supply device 130, and the portable device in the second embodiment. It is a timing chart for demonstrating the operation of the electronic device 700. It is a flowchart for demonstrating operation of an electronic device 700. It is a flowchart for demonstrating the print condition determination process. It is a figure which shows the example of the information for prompting a user to add printing paper. It is a figure which shows the example of the information for prompting the user to replace with another ink ribbon cassette. It is a flowchart for demonstrating print control.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

[Embodiment 1]
FIG. 1 is a block diagram for explaining the components of the electronic device 100 and the external power feeding device 130 according to the first embodiment. In the first embodiment, an example will be described in which the electronic device 100 can operate as an image pickup device and the external power supply device 130 can operate as an AC adapter. The electronic device 100 and the external power supply device 130 have components other than the components shown in FIG. 1, but the description thereof will be omitted in the first embodiment.

In FIG. 1, 101 is a lens unit, 102 is an image pickup unit, 103 is a control unit, 104 is a voltage detection unit, 105 is a shutter button, 106 is a light emitting unit, and 107 is a load circuit. 108 is a FET (Field Effect Transistor) that operates as a first switch, 108a is a parasitic diode that the FET 108 has, and 109 is an FET that operates as a second switch. 110 is a power storage unit, 111 is a protection circuit, 112 is a battery, 113 is a DC input unit, 114 is a charging unit, 115 is an image data input unit, 116 is a shutter signal input unit, 117 is a light emitting communication unit, and 118 is a DC input detection unit. Unit 119 is a charge control output. 120 is a load control output, 121 is a FET control output, 122 is a positive charge output, 123 is a negative charge output, 124 is a connection point existing between the FET 108 and the battery 112, 131 is an AC input unit, and 132 is an AC-DC. The conversion unit 133 is a DC output unit. The main load unit of the electronic device 100 is configured to include a lens unit 101, an imaging unit 102, and a light emitting unit 106. The main load portion of the electronic device 100 can operate with the electric power supplied from the battery 112 via the connection point 124.

When a commercial power source is connected to the AC input unit 131, the external power supply device 130 converts the AC voltage into a DC voltage at the AC-DC conversion unit 132, and outputs a voltage suitable for the electronic device 100 to the DC output unit 133.

In the electronic device 100, when the DC output unit 133 is connected to the DC input unit 113, the DC input detection unit 118 of the control unit 103 detects the power supply from the external power supply device 130.

When the shutter button 105 is not pressed, or when the electronic device 100 is in the power-off state, the control unit 103 controls the charge control output (119) to charge the battery 112 of the power storage unit 110, and the charging unit 114 To start. When the charging unit 114 is activated, constant voltage or constant current controlled electric power is output between the positive charging output (122) and the negative charging output (123). Further, the control unit 103 controls the FET control output (121) to bring the FET 108 into a conductive state, and charges the battery 112 with the electric power of the external power feeding device 130.

When the shutter signal input unit 116 detects that the shutter button 105 is pressed while the battery 112 is being charged, the mode shifts to the shooting mode. After shifting to the shooting mode, the control unit 103 detects the state of the light incident on the imaging unit 102 from the lens unit 101, and the control unit 103 determines whether or not the flash of the light emitting unit 106 is necessary. When it is determined that the flash of the light emitting unit 106 is unnecessary, the FET 108 is shut off, the charging unit 114 is maintained in a rechargeable state, and the subject is photographed.

When it is determined that the flash of the light emitting unit 106 is necessary, the battery remaining amount determination process of the battery 112 is performed. The control unit 103 controls the charge control output (119) to stop the charge unit 114 and controls the FET control output (121) to conduct the FET 108 so that only the electric power from the battery 112 can be used. .. Further, the control unit 103 controls the load control output (120) to control the FET 109 in a conductive state, and generates a current in the load circuit 107. In that state, the voltage detection unit 104 detects the voltage of the battery 112 and determines whether or not the light emitting unit 106 can flash. For example, when the flash enable determination voltage is 6.5 V or more, if the result of the battery remaining amount determination process is 6.5 V or more, it is determined that the flash is possible. When it is determined that the flash is possible, the control unit 103 controls the charging of the light emitting capacitor in the light emitting unit 106, the light emitting control of the xenon lamp, and the like via the light emitting communication unit 117.

When the control unit 103 detects that the charging of the battery 112 is completed, the FET control output (121) is controlled to shut off the FET 108, and the charging of the battery 112 is completed. Even after the FET 108 is cut off, power can be supplied from the battery 112 to the control unit 103 through the parasitic diode 108a of the FET 108.

The control unit 103 keeps the charging unit 114 in a rechargeable state even after the charging of the battery 112 is completed, so that the power consumption of the battery 112 can be suppressed.

Next, the operation of the electronic device 100 will be described with reference to the timing chart of FIG. FIG. 2 describes an operation from the state in which charging is completed until the control unit 103 detects the pressing of the shutter button and controls the flash photography of the light emitting unit 106.

In FIG. 2, 201 is the current during battery level determination processing, 202 is the charging current of the light emitting capacitor, 203 is the shooting control current, 204 is the no-load voltage, 205 is the loaded voltage, 206 is the minimum voltage during flash shooting, and 207. Is the lower limit voltage that can be flashed (example: 6.5V). In FIG. 2, 208 is the FET conduction state, 209 is the FET cut-off state, 210 is the charging unit chargeable state, 211 is the charging unit stopped state, and 212 is the shutter button press detection. 213 is FET continuity control, 214 is charge unit stop control, 215 is flash photography end, 216 is charge unit start control, 217 is charge completion detection, and 218 is FET cutoff control.

Before the shutter signal input unit 116 of 212 detects the pressing of the shutter button 105, the control unit 103 controls the FET 108 to the cutoff state as the charging complete state, and controls the charging unit 114 to the activated state.

When the shutter button 105 is detected by 212, the control unit 103 stops the charging unit 114. Further, the control unit 103 detects the voltage of the voltage detection unit 104 in a state where the FET 108 is in a conductive state and the voltage drop of the parasitic diode 108a is eliminated. First, the no-load voltage (204) is detected. Next, the load control output (120) is controlled to control the FET 109 in a conductive state, and the loaded voltage (205) is detected in a state where the current of 201 is generated in the load circuit 107.

Using the detected no-load voltage (204) and loaded voltage (205) and a predetermined calculation formula, the minimum voltage (206) at the time of flash photography is estimated. Then, the remaining amount of the battery 112 exceeds a predetermined value as compared with the estimated minimum voltage at the time of flash photography (206) and the lower limit voltage for flashing (207) stored in the storage unit of the control unit 103 in advance. Judge whether or not. By this determination, it is determined whether or not flash photography is possible. The predetermined calculation formula is generally determined based on the output current-voltage characteristic of the battery 112, but may be simply (no-load voltage- (no-load voltage-loaded voltage) × 2). The value of the flashable lower limit voltage (example: 6.5V) may be changed depending on the temperature of the battery 112. The method for detecting the temperature of the battery 112 is generally detected by the resistance value of a thermistor (not shown) provided in the vicinity of the battery 112.

In the first embodiment, charging of the capacitor used for the light emitting unit 106 is described assuming a flash of light from a xenon lamp, but the light emitting unit 106 may be a light emitting unit composed of an LED or the like.

If it is determined that a flash is possible, charging of the light emitting capacitor is started. When the charging current (202) is generated and the charging of the light emitting capacitor is completed, the minimum voltage (206) at the time of flash photography is reached, and after the shooting control current (203) required for shooting is generated, the flash photography is performed at 215. finish.

After that, the charge control output (119) is turned on at 216, and charging of the battery 112 is restarted. When charging completion is detected by detecting that the voltage of the battery 112 is equal to or higher than a predetermined voltage in 217, charging of the battery 112 is completed by turning off the FET control output (121) in 218.

If, as a result of the battery remaining amount determination process, it is determined that flashing is not possible due to insufficient battery level, a display indicating that flashing is not possible may be displayed on the display unit of the electronic device 100.

When power is not supplied to the DC input unit 113 from the external power supply device 130, the charging unit 114 is in the stopped state, so that the control unit 103 controls the FET control output (121) to conduct the FET 108 and conduct the FET 108 to conduct the battery 112. Operates on the power of. In this state, the operation when the control unit 103 detects the pressing of the shutter button 105 by the shutter signal input unit 116 is omitted because it is described above.

Next, the operation of the electronic device 100 will be described with reference to FIGS. 3, 4, 5, and 6.

FIG. 3 is a flowchart for explaining the operation of the electronic device 100.

In step S301, it is determined whether or not power is being supplied to the DC input unit 113 from the external power supply device 130. If power is not supplied to the DC input unit 113 from the external power supply device 130, the process proceeds to step S306. When power is supplied to the DC input unit 113 from the external power supply device 130, the process proceeds to step S302.

In step S302, the charging unit 114 is activated to be in a chargeable state.

In step S303, it is determined whether or not the battery 112 is in a fully charged state. If the battery 112 is in a fully charged state, the process proceeds to step S304. If the battery 112 is not in a fully charged state, the process proceeds to step S305.

In step S304, the FET 108 is set to the cutoff state, and the process proceeds to step S306.

In step S305, the FET 108 is set to the conductive state to charge the battery 112.

In step S306, it is determined whether or not the pressing of the shutter button 105 is detected. If the pressing of the shutter button 105 is not detected, the process proceeds to step S301. When the pressing of the shutter button 105 is detected, the process proceeds to step S307.

In step S307, the flash photography determination process is performed. The flash photography determination process performed in step S307 will be described with reference to the flowchart of FIG.

In step S401, the control unit 103 acquires the image data generated by the image pickup unit 102 via the image data input unit 115.

In step S402, the illuminance of the subject is detected from the image data obtained in step S401.

In step S403, it is determined whether or not the illuminance of the subject is sufficient. After the process of step S403 is completed, the process returns to step S307 of FIG. 3 and proceeds to step S308.

In step S308, it is determined whether or not to execute flash photography. If the flash photography is not executed, the process proceeds to step S309. When performing flash photography in step S308, the process proceeds to step S310.

In step S309, control of normal shooting without performing flash shooting is performed, and the process proceeds to step S301.

In step S310, the charging control output (119) is controlled to stop the charging unit 114.

In step S311, when the FET 108 is in the cutoff state, it is set to the conductive state.

In step S312, the battery level determination process is performed. The battery level determination process performed in step S312 will be described with reference to the flowchart of FIG.

In step S501, the voltage detection unit 104 of the control unit 103 detects the voltage when the FET 109 is cut off.

In step S502, the control unit 103 controls the load control output (120) to set the FET 109 in the conductive state.

In step S503, the voltage detection unit 104 of the control unit 103 detects the voltage when the FET 109 is conducting and the load circuit 107 is generating a current.

In step S504, the estimated minimum voltage during operation is calculated from the voltages detected in steps S501 and S503.

In step S505, the lower limit voltage for operation stored in advance is compared with the minimum voltage during operation estimated in step S504.

In step S506, as a result of comparison in step S505, when the estimated minimum voltage during operation is higher than the lower limit voltage during operation, it is determined that the remaining amount of the battery 112 exceeds a predetermined value. After the process of step S506 is completed, the process returns to step S312 of FIG. 3 and proceeds to step S313.

In step S313, it is determined whether or not it is determined in step S506 that the remaining amount of the battery 112 exceeds a predetermined value. If it is not determined in step S506 that the remaining amount of the battery 112 exceeds the predetermined value, the process proceeds to step S314. If it is determined in step S506 that the remaining amount of the battery 112 exceeds the predetermined value, the process proceeds to step S315.

In step S314, a remaining amount warning display for warning the remaining amount of the battery 112 is displayed on the display unit of the electronic device 100, and the process proceeds to step S301.

In step S315, flash photography control is performed. The flash imaging control performed in step S315 will be described with reference to the flowchart of FIG.

In step S601, charging of a capacitor (not shown) of a xenon lamp (not shown) is started.

In step S602, it is determined whether or not the charging of the xenon lamp capacitor is completed. When the charging of the xenon lamp capacitor is completed, the process proceeds to step S603. If the charging of the xenon lamp capacitor is not completed, step S602 is repeated.

In step S603, the flash emission control of the xenon lamp is performed.

In step S604, a still image is taken in synchronization with the flash emission control of step S603.

After the process of step S604 is completed, the process returns to step S315 of FIG. 3 and proceeds to step S301.

As described above, according to the first embodiment, even when the general-purpose external power supply device 130 is used, the electronic device 100 can more accurately determine the remaining amount of the battery 112, and whether or not the flash photography control is possible or not can be determined. It becomes possible to judge accurately. As a result, it is possible to prevent a situation in which the battery voltage drops sharply and the protection circuit 111 of the battery 112 malfunctions.

The battery 112 in the first embodiment may be built in the electronic device 100 or may be built in a battery pack that can be removed from the electronic device 100.

[Embodiment 2]
Next, the second embodiment will be described. 7 and 8 are block diagrams for explaining the components of the electronic device 700, the external power feeding device 130, and the portable device 730 according to the second embodiment. In the second embodiment, an example will be described in which the electronic device 700 can operate as a printer (eg, a mobile printer), the external power supply device 130 can operate as an AC adapter, and the portable device 730 can operate as a mobile phone. .. The electronic device 700, the external power supply device 130, and the portable device 730 have components other than the components shown in FIGS. 7 or 8, but the description thereof will be omitted in the second embodiment. Of the components shown in FIG. 7, the same components as those shown in FIG. 1 are designated by the same reference numerals as those shown in FIG. 1, and their description will be omitted. Of the components shown in FIG. 8, the same components as those shown in FIG. 1 or 7 are designated by the same reference numerals as those shown in FIG. 1 or 7, and their description will be omitted.

The electronic device 700 has a configuration capable of acquiring image data and instructing printing by remote control from the portable device 730. A thermal transfer recording method is used as the printing method of the electronic device 700. The thermal transfer recording method is compact and advantageous for high image quality, but is characterized in that the maximum power during printing is large because the dye applied to the ink ribbon is transferred to the printing paper by heating the thermal head. In order to achieve high image quality, it is necessary to appropriately control the current supplied to the thermal head, and a DC / DC converter that controls the output current supplied to the thermal head to a constant current is used. When the battery 112 is used as a drive power source, when the remaining amount of the battery 112 drops and the battery voltage drops, an excessive current is output from the battery 112 during printing, and the protection circuit 111 of the battery 112 operates and malfunctions. May occur. In order to prevent malfunction of the protection circuit 111 during printing, it is estimated that the remaining battery level determination process is performed before printing and the minimum voltage during printing of one sheet satisfies the condition for operating the protection circuit 111 of the battery 112. In this case, a process of prohibiting printing is performed assuming that the remaining battery level of the battery 112 is insufficient. Since it affects the number of sheets that can be printed by the electronic device 700, it is required that the battery remaining amount determination process be performed as accurately as possible.

In FIGS. 7 and 8, 701 is printing paper. FIG. 7 shows a state after the printing paper 701 is fed and before the start of printing. FIG. 8 shows a state in which the printing paper 701 has moved toward the paper ejection port after printing. 702 is a control unit, 703 is a mechanical control unit, 704 is an ink ribbon cassette, 705 is a drive motor, 706 is a transport roller, 707 is a thermal head, 708 is a paper ejection port, 709 is a wireless communication unit, and 731 is a portable device 730. It is a display unit. The main load unit in the electronic device 700 is configured to include a mechanical control unit 703, a drive motor 705, and a thermal head 707. The main load portion of the electronic device 700 can operate with the electric power supplied from the battery 112 via the connection point 124.

The wireless communication unit 709 is capable of bidirectional wireless communication with the mobile device 730. When the control unit 702 receives the image data and the print instruction signal from the portable device 730 via the wireless communication unit 709, the control unit 702 performs a battery remaining amount determination process of the battery 112 and determines whether or not there is a remaining amount required for printing one image. judge.

Next, with reference to the timing chart of FIG. 9, it is the timing chart of the second embodiment. FIG. 9 describes the operation from the state in which the battery 112 is fully charged to the time when the print instruction signal is input. The parts of the timing chart of FIG. 9 that are common to the timing chart of FIG. 2 are designated by the same reference numerals as those of the timing chart of FIG. 2, and their description will be omitted.

In FIG. 9, 401 is the paper feed current, 402a, 402b, 402c and 402d are the printing currents, 403a, 403b and 403c are the backfeed currents, 404 is the paper ejection current, 405 is the minimum voltage during printing, and 406 is printable. The lower limit voltage (example: 6.5V).

In FIG. 9, the printing paper is fed to a predetermined position (401), printed in the order of yellow (Y) printing (402a), magenta (M) printing (402b), cyan (C) printing (402c), and finally. Overcoat (OC) printing (402d) is performed to protect the printed surface. After the printing is completed, the printed printing paper is ejected (404) from the printer.

In the battery remaining amount determination process, the electronic device 700 detects the no-load voltage (204) and the loaded voltage (205), and the detected no-load voltage (204) and the loaded voltage (205) and a predetermined calculation formula. The minimum voltage (405) during printing is estimated using and. As the predetermined calculation formula, the same calculation formula as in the first embodiment can be used. Then, whether or not the remaining amount of the battery 112 exceeds a predetermined value by comparing the estimated minimum voltage (405) with the printable lower limit voltage (406) stored in the storage unit of the control unit 103 in advance. To judge. By this determination, it is determined whether or not printing is possible.

The control of the charging unit 114 for restarting the charging of the battery 112 after the printing is completed (215) and the control of the FET 108 for ending the charging after the charging is completed (217) are omitted because they are the same as those in the first embodiment.

Next, the operation of the electronic device 700 will be described with reference to FIGS. 10, 11, 12, 13, and 14.

FIG. 10 is a flowchart for explaining the operation of the electronic device 700. Of the flowcharts of FIG. 10, the processes common to the flowchart of FIG. 3 are designated by the same reference numerals as the processes shown in the flowchart of FIG. 3, and their description will be omitted.

In FIG. 10, when the process of step S304 or step S305 is performed, the process proceeds to step S1001.

In step S1001, it is determined whether or not the print image information and the print instruction signal have been received from the portable device 730. If the print image information and the print instruction signal are not received from the mobile device 730, it is determined that there is no print instruction from the mobile device 730, and the process proceeds to step S301. When the print image information and the print instruction signal are received from the mobile device 730, it is determined that the print instruction has been given from the mobile device 730, and the process proceeds to step S310.

In step S313, it is determined whether or not it is determined in step S506 that the remaining amount of the battery 112 exceeds a predetermined value. If it is not determined in step S506 that the remaining amount of the battery 112 exceeds the predetermined value, the process proceeds to step S314. If it is determined in step S506 that the remaining amount of the battery 112 exceeds the predetermined value, the process proceeds to step S1002.

In step S1002, the print condition detection process is performed. The print condition detection process performed in step S1002 will be described with reference to the flowchart of FIG.

FIG. 11 is a sub-flow chart of the print condition detection process.

In step S1101, the presence or absence of printing paper is detected.

In step S1102, the remaining amount of the ink ribbon is detected. After the process of step S1102 is completed, the process returns to step S1002 of FIG. 10 and proceeds to step S1003.

In step S1003, it is determined whether or not the print setting is completed. If the print setting is completed, the process proceeds to step S1005. If the print setting is not completed, step S1003 is repeated.

In step S1004, information necessary for printing is displayed on the display unit 731 of the mobile device 730. When there is no printing paper, as shown in FIG. 12, information (1201) for prompting the user to add printing paper is displayed on the display unit 731. When the ink ribbon is exhausted, as shown in FIG. 13, information (1301) for prompting the user to replace the ink ribbon cassette 704 with another ink ribbon cassette is displayed on the display unit 731.

In step S1005, print control is performed. The print control performed in step S1005 will be described with reference to the flowchart of FIG.

In step S1401, the mechanical drive unit 703 generates a rotational force in the drive motor 705 and applies a driving force to the paper feed roller (not shown) to move the printing paper 701 to a printable position.

In step S1402, yellow printing is performed on the printing paper 701. The mechanical control unit 703 generates a rotational force in the drive motor 705. The rotational force generated in the drive motor 705 is transmitted to the transfer roller 706, and the printing paper 701 is moved in the direction (forward direction) of being discharged from the paper ejection port 708. At the same time, the rotational force generated in the drive motor 705 is transmitted to the ink ribbon cassette 704, and the ink ribbon (not shown) stored in the ink ribbon cassette 704 is pushed out in the paper ejection port 708 direction (forward direction) at the same speed as the printing paper 701. Transport to. Further, the mechanical control unit 703 supplies an electric current to the thermal head 707 to heat the thermal head 707, and transfers the yellow dye applied to the ink ribbon to the printing paper 701.

In step S1403, after the yellow color printing is completed, the printing paper 701 that has moved to the end in the output port direction as shown in FIG. 9 is moved in the direction of the arrow (reverse direction) to a position where the next magenta printing is possible. Move (backfeed) to.

In step S1404, magenta printing is performed on the printing paper 701. In step S1404, the same control as in step S1402 is performed, and the magenta dye applied to the ink ribbon is transferred to the printing paper.

In step S1405, the process is moved (back feed) to a position where the next cyan printing is possible, as in step S1403.

In step S1406, cyan color is printed on the printing paper 701. In step S1406, the same control as in step S1402 is performed, and the cyan dye applied to the ink ribbon is transferred to the printing paper.

In step S1407, similarly to step S1403, the process is moved (back feed) to a position where printing in the next step is possible.

In step S1408, overcoat printing is performed on the printing paper 701. In step S1408, the same control as in step S1402 is performed, and the agent for protecting the colorless and transparent printing surface applied to the ink ribbon is transferred to the printing paper.

In step S1409, the printed printing paper is conveyed to a removable position. After the process of step S1409 is completed, the process returns to step S1005 of FIG. 10 and proceeds to step S301.

As described above, according to the second embodiment, even when the general-purpose external power supply device 130 is used, the electronic device 700 can correctly determine the remaining amount of the battery 112, and whether or not the print control is possible is more accurate. It becomes possible to judge. As a result, it is possible to prevent a situation in which the battery voltage drops sharply and the protection circuit 111 of the battery 112 malfunctions.

100, 700 Electronic equipment 130 External power supply 730 Portable equipment

Claims (3)

The main load unit that can operate with the power supplied from the battery,
A charging means for charging the battery with electric power supplied from an external power supply device, and
A switch connected between the charging means and the battery,
It has the charging means, the switch, and a control means for controlling the main load unit.
The control means
When the battery is charged, the charging means is activated and the switch is made conductive so that the battery is charged by the electric power supplied from the external power supply device.
An electronic device characterized in that when the charging of the battery is completed, the charging means is maintained in a rechargeable state and the switch is shut off. The electronic device according to claim 1, wherein the control means makes it possible to determine whether or not the main load unit can operate by stopping the charging means and conducting the switch. The electronic device according to claim 1 or 2, wherein the electronic device is an image pickup device or a printer.

Images