Systems and methods of charging super-capacitors
AssigneeHewlett-Packard Development Company, L.P.
InventorLuke Lloyd Wardensky
Life of this patent
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Abstract
Systems and methods for charging a super-capacitor are disclosed. An exemplary method may include outputting a controllable signal, such as a pulse width modulated (PWM) signal, to control a charging circuit. The method may also include determining system voltage. The method may also include reducing a duty cycle of the controllable signal if the system voltage is in regulation, and increasing the duty cycle of the controllable signal if the system voltage is out of regulation to reduce brown-outs during charging of the super-capacitor.
Claims15
A system for charging a super-capacitor, comprising:
- a power rail providing a system voltage for an electronic device;
- a controller configured to output a controllable signal to control a charging circuit for the super-capacitor, the controller changing a duty cycle of the controllable signal in response to changes in a system voltage;
- and
- a switching element in the charging circuit, the switching element activating in response to a reduced a duty cycle of the controllable signal to charge the super-capacitor, and the switching element deactivating in response to an increased duty cycle of the controllable signal to reduce brown-outs during charging of the super-capacitor.
A method for charging a super-capacitor, comprising:
- outputting a controllable signal to control a charging circuit;
- determining system voltage;
- and
- reducing a duty cycle of the controllable signal if the system voltage is in regulation, and increasing the duty cycle of the controllable signal if the system voltage is out of regulation to reduce brown-outs during charging of the super-capacitor.
A system for charging a super-capacitor, comprising:
- means for outputting a pulse width modulated (PWM) signal;
- means for identifying system voltage;
- means for reducing a duty cycle of the PWM signal if the system voltage is in regulation;
- and
- means for increasing the duty cycle of the PWM signal if the system voltage is out of regulation to reduce brown-outs during charging of the super-capacitor.
Dependencies are inferred from the claim text.