Power management unit for battery-operated devices
First Claim
1. A power management unit for a battery-operated electronic device having a bus interface for the interconnection with another electronic device, the power management unit comprising:
- an electric energy storage element coupled between a battery of the battery-operated electronic device and a voltage supply line of the bus interface, the electric energy storage element being operable to charge/discharge electric energy;
a drive circuitry arranged to control a charge/discharge of the electric energy storage element, wherein the drive circuitry is operable to;
cause an electric power supplied by said another electronic device through the voltage supply line to re-charge the battery, as being reduced in voltage from a nominal voltage of about 5.0 volts to a nominal voltage of about 3.6 volts by a DC-DC voltage step-down converter having an inductor;
orin case said another electronic device does not supply electric power, cause the battery to supply electric power to said another electronic device through said voltage supply line, as being increased in voltage from a nominal voltage of about 3.6 volts to a nominal voltage of about 5.0 volts by a DC-DC voltage step-up converter that utilizes the inductor of the DC-DC voltage step-down converter.
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Accused Products
Abstract
A power management unit for a battery-operated electronic device having a bus interface for the interconnection with another electronic device, the power management unit including an electric energy storage element coupled between a battery of the battery-operated electronic device and a voltage supply line of the bus interface, the electric energy storage element being operable to charge/discharge electric energy; a drive circuitry arranged to control a charge/discharge of the electric energy storage element. The drive circuitry is operable to cause an electric power supplied by the other electronic device through the voltage supply line to re-charge the battery; or, in case the other electronic device does not supply electric power, cause the battery supply electric power to the other electronic device through the voltage supply line. The power management unit is particularly adapted for battery-operated, mobile USB OTG devices.
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Citations
15 Claims
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1. A power management unit for a battery-operated electronic device having a bus interface for the interconnection with another electronic device, the power management unit comprising:
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an electric energy storage element coupled between a battery of the battery-operated electronic device and a voltage supply line of the bus interface, the electric energy storage element being operable to charge/discharge electric energy; a drive circuitry arranged to control a charge/discharge of the electric energy storage element, wherein the drive circuitry is operable to; cause an electric power supplied by said another electronic device through the voltage supply line to re-charge the battery, as being reduced in voltage from a nominal voltage of about 5.0 volts to a nominal voltage of about 3.6 volts by a DC-DC voltage step-down converter having an inductor;
orin case said another electronic device does not supply electric power, cause the battery to supply electric power to said another electronic device through said voltage supply line, as being increased in voltage from a nominal voltage of about 3.6 volts to a nominal voltage of about 5.0 volts by a DC-DC voltage step-up converter that utilizes the inductor of the DC-DC voltage step-down converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of managing power in a battery-operated electronic device having a bus interface for the interconnection with another electronic device, the method comprising:
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charging a battery of the battery-operated electronic device with a terminal of the battery connected to the another device through a voltage supply line and an inductor when the another device is capable of supplying energy to recharge the electric energy storage element, energy supplied from the another device having a nominal value of about 5.0 volts; and discharging the battery of the battery-operated electronic device with the terminal of the battery connected to the another device through the voltage supply line and the inductor when the another device is incapable of supplying energy to recharge the electric energy storage element, energy supplied by the battery having a nominal value of about 3.6 volts. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A power management unit for a battery-operated electronic device having a bus interface for the interconnection with another electronic device, the power management unit comprising:
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an electric energy storage element coupled between a battery of the battery-operated electronic device and a voltage supply line of the bus interface, the electric energy storage element being operable to charge/discharge electric energy; a drive circuitry arranged to control a charge/discharge of the electric energy storage element, wherein the drive circuitry includes; a DC-DC voltage step-down converter including an inductor and that reduces a voltage provided to a terminal of the battery from the another device through the voltage supply line and the inductor when the another device is capable of supplying energy to recharge the electric energy storage element, the voltage reduction being from a nominal voltage of about 5.0 volts to a nominal voltage of about 3.6 volts; and a DC-DC voltage step-up converter that utilizes the inductor of the DC-DC voltage step-down converter and that increases a voltage provided to the voltage supply line from the terminal of the battery when the another device is incapable of supplying energy to recharge the electric energy storage element, the voltage increase being from a nominal voltage of about 3.6 volts to a nominal voltage of about 5.0 volts.
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Specification