RECHARGEABLE ELECTRIC APPARATUS
1 Assignment
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Accused Products
Abstract
A rechargeable electric apparatus includes a switching device (12), a first shunt resistor (13-1) that connects the switching device (12) and a positive electrode of a secondary battery (11), a second shunt resistor (13-2) that connects a load (14) and the positive electrode of the secondary battery (11), and a control unit (15). The control unit (15) controls turning on and off of the switching device (12) on the basis of voltages at two ends of the first shunt resistor (13-1) and voltages at two ends of the second shunt resistor (13-2) in order to control a supply current flowing to the secondary battery (11) via the first shunt resistor (13-1) and to control a load current flowing to the load (14) via the second shunt resistor (13-2).
10 Citations
12 Claims
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1-6. -6. (canceled)
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7. A rechargeable electric apparatus configured to charge a secondary battery by using power supply from outside via a charge adapter configured to be attachably and detachably connected to the rechargeable electric apparatus, the rechargeable electric apparatus being provided with a load to be driven with power supply from the secondary battery or from outside via the charge adapter, the rechargeable electric apparatus comprising:
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a switching device configured to receive the power supply from outside via the charge adapter, the switching device being configured to be turned on and off on the basis of a switching signal to supply a supply current to the rechargeable electric apparatus; a first shunt resistor connected between the switching device and a positive electrode of the secondary battery, the first shunt resistor being configured to detect the supply current supplied to the rechargeable electric apparatus via the switching device; a second shunt resistor connected between the load and the positive electrode of the secondary battery, the second shunt resistor being configured to detect a load current supplied to the load; and a control unit configured to receive inputs of voltages at two ends of the first shunt resistor and at two ends of the second shunt resistor when the switching device is turned on, the control unit being configured to control turning on and off of the switching device on the basis of the inputted voltages to control the supply current and the load current, wherein a resistance value of the first shunt resistor is set equal to or above a value obtained by dividing a least resolution of an A/D conversion voltage when the control unit converts an inputted analog voltage into a digital voltage by a minimum value of the supply current to be detected, and a resistance value of the second shunt resistor is set equal to or above a value obtained by dividing the least resolution of the A/D conversion voltage when the control unit converts the inputted analog voltage into the digital voltage by a minimum detectable value of the load current. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification