Dual mode power management system
First Claim
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1. A power management system comprising:
- a primary power source;
a secondary power source generated from the primary power source; and
a power output selector coupled to the primary power source and the secondary power source, the power output selector operating to select;
(a) the primary power source as a power supply at a desired regulated power output, during initialization of the power management system and at any other time during operation of the power management system that a magnitude of the primary power source exceeds a magnitude of the secondary power source,(b) the primary power source as the power supply at the desired regulated power output, at any time after initialization of the power management system that the magnitude of the primary power source exceeds the magnitude of a desired regulated power output, and(c) the secondary power source as the power supply at the desired regulated power output, at any time after initialization of the power management system that the magnitude of the secondary power source exceeds the magnitude of the primary power source and the magnitude of the primary power source is less than the desired regulated power output.
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Abstract
A power management system has a primary power source (100) and a secondary power source (106) generated from the primary power source (100) with a power output selector (204) coupled to each for selecting power for a regulated power output (212). First, during initialization and at any other time during operation, when the primary power source (102) exceeds the secondary power source (106), the primary power source (102) is used as a power supply for the regulated power output (212). Second, at any time after initialization that the primary power source (102) exceeds the regulated power output (212), the primary power source (102) is used as the power supply for the regulated power output (212). Third, at any time after initialization that the secondary power source (106) exceeds the primary power source (106) and the primary power source (102) is less than the regulated power output (212), the secondary power source (106) is used as the power supply for the regulated power output (212).
11 Citations
17 Claims
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1. A power management system comprising:
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a primary power source; a secondary power source generated from the primary power source; and a power output selector coupled to the primary power source and the secondary power source, the power output selector operating to select; (a) the primary power source as a power supply at a desired regulated power output, during initialization of the power management system and at any other time during operation of the power management system that a magnitude of the primary power source exceeds a magnitude of the secondary power source, (b) the primary power source as the power supply at the desired regulated power output, at any time after initialization of the power management system that the magnitude of the primary power source exceeds the magnitude of a desired regulated power output, and (c) the secondary power source as the power supply at the desired regulated power output, at any time after initialization of the power management system that the magnitude of the secondary power source exceeds the magnitude of the primary power source and the magnitude of the primary power source is less than the desired regulated power output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A power management system comprising:
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a primary power source; a secondary power source generated from the primary power source; a comparator coupled to the primary power source, a reference voltage, and the power output selector, the comparator having a switching threshold defined as a difference of the reference voltage and a predetermined hysteresis voltage; and a power output selector coupled to comparator, the primary power source and the secondary power source, the power output selector operating to select; (a) the primary power source as a power supply at a desired regulated power output, during initialization of the power management system and at any other time during operation of the power management system that a magnitude of the primary power source exceeds a magnitude of the secondary power source by a magnitude determined as a difference between the reference voltage and the predetermined hysteresis voltage, (b) the primary power source as the power supply at the desired regulated power output, at any time after initialization of the power management system that the magnitude of the primary power source exceeds the magnitude of a desired regulated power output by the magnitude determined as the difference between the reference voltage and the predetermined hysteresis voltage, and (c) the secondary power source as the power supply at the desired regulated power output, at any time after initialization of the power management system that the magnitude of the secondary power source exceeds the magnitude of the primary power source by the predetermined hysteresis voltage and the magnitude of the primary power source is less than the desired regulated power output. - View Dependent Claims (15, 16, 17)
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Specification
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Current AssigneeGoogle Technology Holdings LLC (Alphabet Inc.)
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Original AssigneeMotorola, Inc. (Motorola Solutions, Inc.)
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InventorsMittel, James G, Simmons, John W
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Primary Examiner(s)Tso; Edward H.
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Assistant Examiner(s)LUK, LAWRENCE W
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Application NumberUS09/544,228Time in Patent Office3,133 DaysField of Search307/75, 307/64, 307/46, 307/66, 307/48, 307/43, 307/72, 300/103, 300/138US Class Current307/75CPC Class CodesH02J 1/08 Three-wire systems; Systems...H02J 1/082 Plural DC voltage, e.g. DC ...H02J 1/10 Parallel operation of dc so...
