Drift reset circuit for updating the input offset voltage in an ionization smoke detector
AssigneeMicrochip Technology Incorporated
InventorsArthur B. Eck, Jonathan Corbett, Patrick McFarland
Life of this patent
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Abstract
A system and method for a drift reset circuit for updating the input offset voltage in an ionization smoke detector are disclosed. The method may include monitoring an ionization chamber of a smoke detector for an alert. The method may also include periodically powering on a drift reset circuit to update an input offset voltage of an operational amplifier. The method may additionally include outputting the input offset voltage to the operational amplifier. The method may further include powering off the drift reset circuit.
Claims20
An apparatus, comprising:
- a drift reset circuit communicatively coupled to an ionization chamber of a smoke detector and an operational amplifier;
- and
- a control circuit communicatively coupled to the drift reset circuit, the control circuit to:
- periodically power on the drift reset circuit to update an input offset voltage of the operational amplifier;
- and
- power off the drift reset circuit after updating the input offset voltage.
A method, comprising:
- monitoring an ionization chamber of a smoke detector for an alert;
- periodically powering on a drift reset circuit to update an input offset voltage of an operational amplifier;
- outputting the input offset voltage to the operational amplifier;
- and
- powering off the drift reset circuit.
A system, comprising:
- an ionization chamber of a smoke detector;
- an operational amplifier communicatively coupled to the ionization chamber;
- a drift reset circuit communicatively coupled to the ionization chamber and the operational amplifier;
- and
- a control circuit communicatively coupled to the drift reset circuit, the control circuit to:
- periodically power on the drift reset circuit to update an input offset voltage of the operational amplifier;
- and
- power off the drift reset circuit after updating the input offset voltage.
Dependencies are inferred from the claim text.