CHARGING AND POWER SUPPLY FOR MOBILE DEVICES
First Claim
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1. A power management method for allocating power between a rechargeable battery and an electronic system, said electronic system having a power input and a plurality of modes of operation, the method comprising:
- generating output power;
receiving a reference voltage from said electronic system;
determining, based on said reference voltage, a minimum voltage value needed at a node directly connected to said power input of said electronic system;
sensing that a voltage at said node is below said minimum voltage value; and
restricting, responsive to said sensing, current from said output power to said battery, thereby increasing power allocated to said electronic system.
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Abstract
Charging and power supply for mobile devices is disclosed. A USB-compliant charging and power supply circuit includes switch-mode battery charging circuitry for receiving power from an external power source and for supplying output power through an output node to an electronic system of an electronic communication device and a battery. Battery isolation circuitry includes a semiconductor switch connecting the output node to the battery. The battery isolation circuitry senses voltage at the output node and variably restricts current to the battery when the voltage is below a minimum voltage value by operationally controlling the semiconductor switch as current passes through it. During variable current restriction the electronic system is supplied required power with said battery being supplied any additional available power.
26 Citations
11 Claims
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1. A power management method for allocating power between a rechargeable battery and an electronic system, said electronic system having a power input and a plurality of modes of operation, the method comprising:
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generating output power; receiving a reference voltage from said electronic system; determining, based on said reference voltage, a minimum voltage value needed at a node directly connected to said power input of said electronic system; sensing that a voltage at said node is below said minimum voltage value; and restricting, responsive to said sensing, current from said output power to said battery, thereby increasing power allocated to said electronic system. - View Dependent Claims (2)
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3. A USB-compliant charging and power supply circuit comprising:
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switch-mode battery charging circuitry adapted to; receive external power from an external power source; and supply output power, through an output node, to; an electronic system of an electronic communication device; and a battery, via a switch; said switch-mode battery charging circuitry having an integrated circuit and an inductor, said integrated circuit arranged to cooperate with said inductor to supply said output power with a current of greater magnitude than current of said external power; battery isolation circuitry adapted to; receive a reference voltage from said electronic system; determine, based on said reference voltage, a minimum voltage value needed at said output node; sense that a voltage at said output node is below said minimum voltage value; and control, responsive to said sensing, said switch to restrict current of said output power to said battery, thereby increasing a power allocated to said electronic system. - View Dependent Claims (4, 5, 6, 7)
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8. An electronic communication device electrically connectable to an external power source, said device comprising:
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a device housing; a rechargeable battery contained within said housing; an electronic system contained within said housing; and a charging and power supply circuit contained within said housing, said charging and power supply circuit including; switch-mode battery charging circuitry adapted to; receive power from an external power source; and supply output power, through an output node, to; said electronic system; and said rechargeable battery, via a switch; said switch-mode battery charging circuitry having an integrated circuit and an inductor, said integrated circuit arranged to cooperate with said inductor to supply said output power with a current of greater magnitude than current of said power received from said external power source; battery isolation circuitry adapted to; receive a reference voltage from said electronic system; determine, based on said reference voltage, a minimum voltage value needed at said output node; sense that a voltage at said output node is below said minimum voltage value; and control, responsive to said sensing, said switch to restrict current of said output power to said rechargeable battery, thereby increasing power allocated to said electronic system. - View Dependent Claims (9, 10, 11)
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Specification
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Current AssigneeFundamental Innovation Systems International LLC (Fundamental Innovation Systems International Holdings LLC)
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Original AssigneeBlackberry Limited
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InventorsVESELIC, Dusan
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current307/35
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CPC Class CodesH02J 7/00 Circuit arrangements for ch...H02J 7/0068 Battery or charger load swi...Y10T 29/49002 Electrical device makingY10T 29/49117 Conductor or circuit manufa...
