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US 8,569,996 B2Granted
Power management circuit to manage distribution of received power and a portable apparatus having the same
AssigneeSamsung Electronics Co., Ltd.
InventorsJung-Woo Ha, Ho-Jung Ju
Life of this patent
Estimating the term…
Abstract
A portable apparatus includes a system configured to receive a system current and perform a function, a charging battery configured to be charged with a charging battery current and supply power to the system, and a power management circuit configured to receive an externally supplied power, supply the system current to the system, and supply the charging battery current to the charging battery based on a sensed level of the system current, wherein the charging battery current decreases in proportion to the system current.
Claims11
A portable apparatus comprising:
- a system configured to receive a system current and perform a function;
- a charging battery configured to be charged with a charging battery current and supply power to the system;
- and
- a power management circuit configured to receive an externally supplied power, supply the system current to the system, and supply the charging battery current to the charging battery based on a sensed level of the system current, wherein the charging battery current decreases in proportion to the system current, and
- wherein the power management circuit comprises a first current mirror unit configured to output a proportional current used to determine the sensed level,
- wherein the power management circuit further comprises:
- a system power supply configured to directly receive the externally supplied power, supply the system current to the system, and output a proportional current that increases in proportion to the system current;
- a charging battery power supply configured to directly receive the externally supplied power and supply the charging battery current to the charging battery, wherein the charging battery current decreases in proportion to the proportional current;
- an input terminal to which the externally supplied power is applied;
- a system output terminal connected to the system and through which the system current is output;
- a sensing terminal connected to a sensing resistor and through which the proportional current is output;
- and
- a charging battery output terminal connected to the charging battery and through which the charging battery current is output,
- wherein the system power supply comprises:
- a first controller configured to maintain a voltage of the system output terminal at a first voltage level in response to a reference voltage and output a first signal in response to the reference voltage and the voltage of the system output terminal;
- and
- wherein the first current mirror unit is directly connected to the input terminal, and is configured to supply the system current through the system output terminal to the system in response to the first signal and output the proportional current to the sensing terminal.
14 more elements
A portable apparatus comprising:
- a system configured to execute at least one instruction;
- a charging battery;
- and
- a power management circuit configured to receive an external voltage and determine whether the external voltage is sufficient to power the system based on an amount of current consumed by the system,
- wherein when the power management circuit determines that the external voltage is sufficient, the power management circuit is configured to provide a first current to the system based on the external voltage and a second current to the charging battery, and
- wherein when the power management circuit determines that the external voltage is insufficient, the power manage circuit is configured to provide a third current to the system based on the external voltage and a fourth current from the charging battery to the system, and
- wherein the power management circuit comprises a current mirror circuit having an output used to determine the sufficiency of the external voltage,
- wherein the power management circuit further comprises:
- a first PMOS transistor connected between a first input terminal receiving the external voltage and a second input terminal of the system receiving the first current;
- a first operational amplifier (OP1), the output of the OP1 connected to the gate of the first PMOS transistor;
- a voltage divider connected between the second input terminal and an input terminal of the OP1;
- and
- a second PMOS transistor connected between the first input terminal and a sensing terminal, the gate of the second PMOS transistor receiving the output of the OP1,
- wherein the power management circuit determines the amount of power consumed by the system based on a sensing current output from the second PMOS transistor to the sensing terminal.
11 more elements
Dependencies are inferred from the claim text.