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US 8,264,805 B2Granted
Dual voltage hot swap module power control
AssigneeApple Inc.
InventorCharles E. Norman
Life of this patent
Estimating the term…
Abstract
A module hot swap circuit includes a low voltage-drop rectifier adapted to receive either positive or negative voltages of different absolute values. The rectifier is coupled to a power manager that provides dual startup/shutdown voltage thresholds and inrush current limiting. A detector prevents reverse current flow allowing the module to hold up during input voltage drop-outs.
Claims17
A hot swap circuit, comprising:
- a voltage sensor operable to sense an input supply voltage;
- a polarity corrector operable to provide a desired output polarity;
- a controller coupled to the voltage sensor and the polarity corrector, the controller being operable to set dual startup-shutdown thresholds;
- and
- a detector coupled to the polarity corrector, the detector being operable:
- to detect supply voltage drop-out;
- and
- to cause the polarity corrector to turn off in response to detection of supply voltage drop-out.
5 more elements
A method of hot-swapping an electronic module, comprising:
- applying an input supply voltage to a polarity corrector, the polarity corrector being operable to provide a desired supply voltage polarity;
- sensing the input supply voltage;
- setting dual startup-shutdown thresholds in response to the sensed input supply voltage;
- and
- in the event of supply voltage drop-out:
- detecting the supply voltage drop-out;
- and
- turning off the polarity corrector in response to detection of supply voltage drop-out.
5 more elements
Dependencies are inferred from the claim text.