Abstract: An electronic device comprises a determination unit configured to determine a target remaining-capacity of a battery provided in an accessory device connected to the electronic device, based on an operation mode of the electronic device; and a power supply unit configured to supply power to the accessory device based on the determined remaining-capacity.

Abstract: A battery pack that is connectable to an electronic device is disclosed. The battery pack includes positive terminals, negative terminals, and a cutting unit. The cutting unit cuts a current that flows from a battery cell to the electronic device in a case where the current flowing from the battery cell to the electronic device exceeds a maximum current value. The battery pack further includes a control unit that changes the maximum current value based on the number of positive terminals and negative terminals that are connected to the electronic device.

Abstract: An electronic device comprises a determination unit configured to determine a target remaining-capacity of a battery provided in an accessory device connected to the electronic device, based on an operation mode of the electronic device; and a power supply unit configured to supply power to the accessory device based on the determined remaining-capacity.

Abstract: An electronic device includes a communication unit and a control unit. The communication unit performs authentication communication to authenticate an external device connected to the electronic device. The control unit sets a time limit of the authentication communication to a predetermined time in a case where the external device is a first device. The predetermined time is a time that is longer than a time required for authentication communication between the first device and the electronic device, and is shorter than a time required for authentication communication between the electronic device and a second device different from the first device.

Abstract: A battery pack that is connectable to an electronic device is disclosed. The battery pack includes positive terminals, negative terminals, and a cutting unit. The cutting unit cuts a current that flows from a battery cell to the electronic device in a case where the current flowing from the battery cell to the electronic device exceeds a maximum current value. The battery pack further includes a control unit that changes the maximum current value based on the number of positive terminals and negative terminals that are connected to the electronic device.

Abstract: An accessory attachable to and detachable from an image pickup apparatus includes a first connector connectable to the image pickup apparatus, a second connector connectable to the image pickup apparatus, and an accessory controller configured to communicate with the image pickup apparatus. The accessory controller, in an initial setting after the accessory is attached to the image pickup apparatus, sends a first detection signal to the image pickup apparatus via the first connector and receives, in response to a second detection signal for detecting that the second connector is attached to the image pickup apparatus, a third detection signal from the image pickup apparatus via the second connector.

Abstract: An accessory attachable to and detachable from an image pickup apparatus includes a first connector connectable to the image pickup apparatus, a second connector connectable to the image pickup apparatus, and an accessory controller configured to communicate with the image pickup apparatus. The accessory controller, in an initial setting after the accessory is attached to the image pickup apparatus, sends a first detection signal to the image pickup apparatus via the first connector and receives, in response to a second detection signal for detecting that the second connector is attached to the image pickup apparatus, a third detection signal from the image pickup apparatus via the second connector.

Abstract: A charging apparatus capable of charging a battery device includes a communication terminal configured to receive a signal for controlling charging of the battery device from the battery device, a detection unit configured to detect a voltage level of an input signal which is input in the charging apparatus via the communication terminal, a signal switching unit configured to connect between the communication terminal and the detection unit and change the voltage level of the input signal, and a charging control unit configured to control charging of the battery device based on the voltage level of the input signal changed by controlling the signal switching unit.

Abstract: A charging apparatus capable of charging a battery device includes a communication terminal configured to receive a signal for controlling charging of the battery device from the battery device, a detection unit configured to detect a voltage level of an input signal which is input in the charging apparatus via the communication terminal, a signal switching unit configured to connect between the communication terminal and the detection unit and change the voltage level of the input signal, and a charging control unit configured to control charging of the battery device based on the voltage level of the input signal changed by controlling the signal switching unit.

Abstract: A power supply apparatus comprises a current limiting unit connected in series between a power source and a power supply circuit that limits output current of the power source; a first switch connected in series with the current limiting unit; a second switch connected in parallel with the current limiting unit; a resistor connected in series between the power source and the current limiting unit; an abnormal current detection unit, connected in parallel with the resistor, that detects the current flowing through the resistor and determines whether or not the detected current is abnormal; and a control unit that turns on the first switch if the abnormal current detection unit detects a current, and, thereafter, turns the second switch on if the detected current is not abnormal, and turns the first switch off if the detected current is abnormal.

Abstract: A power supply control system having a first switch circuit configured to set a power supply line which connects a power supply unit and a power supply circuit to one of a connected state and a non-connected state, a first control unit configured to operate in one of a normal mode and a sleep mode in which a consumption current is smaller than in the normal mode, and to detect a magnitude of a current flowing into the first switch circuit and control an operation of the first switch circuit based on the detected magnitude of the current while operating in the normal mode, and a second control unit configured to control an operation of the first control unit based on the detection result of an opening-closing state detection unit configured to detect an opening-closing state of a battery lid provided to the power supply unit.

Abstract: A power supply apparatus comprises a current limiting unit connected in series between a power source and a power supply circuit that limits output current of the power source; a first switch connected in series with the current limiting unit; a second switch connected in parallel with the current limiting unit; a resistor connected in series between the power source and the current limiting unit; an abnormal current detection unit, connected in parallel with the resistor, that detects the current flowing through the resistor and determines whether or not the detected current is abnormal; and a control unit that turns on the first switch if the abnormal current detection unit detects a current, and, thereafter, turns the second switch on if the detected current is not abnormal, and turns the first switch off if the detected current is abnormal.

Abstract: A power supply apparatus comprises a current limiting unit connected in series between a power source and a power supply circuit that limits output current of the power source; a first switch connected in series with the current limiting unit; a second switch connected in parallel with the current limiting unit; a resistor connected in series between the power source and the current limiting unit; an abnormal current detection unit, connected in parallel with the resistor, that detects the current flowing through the resistor and determines whether or not the detected current is abnormal; and a control unit that turns on the first switch if the abnormal current detection unit detects a current, and, thereafter, turns the second switch on if the detected current is not abnormal, and turns the first switch off if the detected current is abnormal.

Abstract: The present invention provides a power supply control system comprising a first switch circuit configured to set a power supply line which connects a power supply unit and a power supply circuit to one of a connected state and a non-connected state, a first control unit configured to operate in one of a normal mode and a sleep mode in which a consumption current is smaller than in the normal mode, and to detect a magnitude of a current flowing into the first switch circuit and control an operation of the first switch circuit based on the detected magnitude of the current while operating in the normal mode, and a second control unit configured to control an operation of the first control unit based on the detection result of an opening-closing state detection unit configured to detect an opening-closing state of a battery lid provided to the power supply unit.

Abstract: The present invention provides a power supply control system comprising a first switch circuit configured to set a power supply line which connects a power supply unit and a power supply circuit to one of a connected state and a non-connected state, a first control unit configured to operate in one of a normal mode and a sleep mode in which a consumption current is smaller than in the normal mode, and to detect a magnitude of a current flowing into the first switch circuit and control an operation of the first switch circuit based on the detected magnitude of the current while operating in the normal mode, and a second control unit configured to control an operation of the first control unit based on the detection result of an opening-closing state detection unit configured to detect an opening-closing state of a battery lid provided to the power supply unit.

Abstract: The present invention provides a power supply control system comprising a first switch circuit configured to set a power supply line which connects a power supply unit and a power supply circuit to one of a connected state and a non-connected state, a first control unit configured to operate in one of a normal mode and a sleep mode in which a consumption current is smaller than in the normal mode, and to detect a magnitude of a current flowing into the first switch circuit and control an operation of the first switch circuit based on the detected magnitude of the current while operating in the normal mode, and a second control unit configured to control an operation of the first control unit based on the detection result of an opening-closing state detection unit configured to detect an opening-closing state of a battery lid provided to the power supply unit.

Abstract: A power supply apparatus comprises a current limiting unit connected in series between a power source and a power supply circuit that limits output current of the power source; a first switch connected in series with the current limiting unit; a second switch connected in parallel with the current limiting unit; a resistor connected in series between the power source and the current limiting unit; an abnormal current detection unit, connected in parallel with the resistor, that detects the current flowing through the resistor and determines whether or not the detected current is abnormal; and a control unit that turns on the first switch if the abnormal current detection unit detects a current, and, thereafter, turns the second switch on if the detected current is not abnormal, and turns the first switch off if the detected current is abnormal.