Power management topologies
First Claim
1. A wake up circuit comprising:
- a comparison circuit adapted to receive a first signal representative of a charging current level provided to a battery via a path and a second signal representative of a predetermined wake up current level and to provide a comparison output signal in response to said first and second signal; and
an output decision circuit adapted to receive at least said comparison output signal and a selector signal from a selector circuit, said output decision circuit providing one of said comparison output signal and said selector signal to a switch to control a state of said switch, said switch coupled to said path.
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Accused Products
Abstract
A wake up circuit according to one embodiment includes a comparison circuit and an output decision circuit. The comparison circuit may be adapted to receive a first signal representative of a charging current level provided to a battery via a path and a second signal representative of a predetermined wake up current level and to provide a comparison output signal in response to the first and second signal. The output decision circuit may be adapted to receive at least the comparison output signal and a selector signal from a selector circuit, the output decision circuit providing one of the comparison output signal and the selector signal to a switch to control a state of the switch, the switch coupled to the path.
83 Citations
20 Claims
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1. A wake up circuit comprising:
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a comparison circuit adapted to receive a first signal representative of a charging current level provided to a battery via a path and a second signal representative of a predetermined wake up current level and to provide a comparison output signal in response to said first and second signal; and
an output decision circuit adapted to receive at least said comparison output signal and a selector signal from a selector circuit, said output decision circuit providing one of said comparison output signal and said selector signal to a switch to control a state of said switch, said switch coupled to said path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
a wake up circuit, said wake up circuit comprising;
a comparison circuit adapted to receive a first signal representative of a charging current level provided to a battery via a path and a second signal representative of a predetermined wake up current level and to provide a comparison output signal in response to said first and second signal; and
an output decision circuit adapted to receive at least said comparison output signal and a selector signal from a selector circuit, said output decision circuit providing one of said comparison output signal and said selector signal to a switch to control a state of said switch, said switch coupled to said path. - View Dependent Claims (10, 11, 12)
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13. A method comprising:
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providing a first signal to a switch, said switch coupled to a path, said path coupled to a battery, said switch responsive to said first signal to enter an intermediate conduction state to provide a current level to said battery representative of a predetermined wake up current level; and
providing a second signal to said switch, said switch responsive to said second signal to enter a full conduction state when said second signal is in a first state. - View Dependent Claims (14, 15, 16)
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17. An apparatus comprising:
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a first path configured to be coupled to a controllable DC power source;
a second path configured to be coupled to a battery;
a third path configured to be coupled to a system load, wherein said first, second, and third paths are coupled to a common node;
a first switch coupled to said first path to allow selective coupling of said controllable DC power source to said system load via said common node;
a second switch coupled to said second path to allow selective coupling of said battery to said common node; and
a wake up circuit comprising a comparison circuit and an output decision circuit, said comparison circuit adapted to receive a first signal representative of a charging current level provided to said battery via said second path and a second signal representative of a predetermined wake up current level of said battery and to provide a comparison output signal in response to said first and second signal, said output decision circuit adapted to receive at least said comparison output signal and a selector signal from a selector circuit, said output decision circuit providing one of said comparison output signal and said selector signal to said second switch to control a state of said second switch. - View Dependent Claims (18, 19, 20)
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Specification