Power management topologies to control power between a DC power source and one or more batteries to a system load
First Claim
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1. A wake up circuit comprising:
- a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to a battery and said wake up current signal representative of a wake up current level; and
an output decision circuit configured to receive said comparison output signal and provide a first and a second control signal to a switch, wherein said first control signal is configured to control said switch to limit the charging current provided to said battery to said wake up current level and wherein said second control signal is configured to control said switch to be either ON or OFF.
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Abstract
A power supply topology according to one embodiment includes a first path coupled to a controllable DC power source, a second path coupled to a rechargeable battery, and a third path coupled to a system load, the three paths coupled to a common node. The topology may further include a unidirectional switch coupled to the first path and a selectively unidirectional switch coupled to the second path. The topology may further include a power management control circuit including a wake up circuit having a comparison circuit and an output decision circuit. Of course, many alternatives, variations, and modifications are possible without departing from this embodiment.
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Citations
20 Claims
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1. A wake up circuit comprising:
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a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to a battery and said wake up current signal representative of a wake up current level; and an output decision circuit configured to receive said comparison output signal and provide a first and a second control signal to a switch, wherein said first control signal is configured to control said switch to limit the charging current provided to said battery to said wake up current level and wherein said second control signal is configured to control said switch to be either ON or OFF. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a switch configured to allow selective coupling of a controllable DC power source to a system load via a common node, said switch also configured to allow selective coupling of a battery to said common node; and a wake up circuit comprising; a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to a battery and said wake up current signal representative of a wake up current level; and an output decision circuit configured to receive said comparison output signal and provide a first and a second control signal to said switch, wherein said first control signal is configured to control said switch to limit the charging current provided to said battery to said wake up current level and wherein said second control signal is configured to control said switch to be either ON or OFF. - View Dependent Claims (10, 11, 12)
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13. A method comprising:
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receiving a first signal at a switch, said switch 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 wake up current level; and receiving a second signal at 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 system comprising:
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a controllable DC power source; a battery; a first switch configured to allow selective coupling of said controllable DC power source to a system load via said common node; a second switch configured to allow selective coupling of said battery to said common node; and a wake up circuit comprising; a comparison circuit configured to generate a comparison output signal based on a comparison of a charging signal and a wake up current signal, said charging signal representative of a charging current level provided to said battery and said wake up current signal representative of a wake up current level; and an output decision circuit configured to receive said comparison output signal and provide a first and a second control signal to said switch, wherein said first control signal is configured to control said switch to limit the charging current provided to said battery to said wake up current level and wherein said second control signal is configured to control said switch to be either ON or OFF. - View Dependent Claims (18, 19, 20)
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Specification