Back to results
US 2008/0164914 A1Published application
High Accuracy Zero Crossing Detector and Method Therefor
AssigneeSemiconductor Components Industries, LLC
InventorAbdesselam Bayadroun
Life of this patent
Estimating the term…
Abstract
In one embodiment, a zero crossing detector couples a plurality of comparators in parallel and operates at least a portion of the comparators at different time periods.
Claims19
A zero crossing detection method comprising:
- receiving a sense signal;
- coupling a first comparator as a first amplifier, and storing an output of the first amplifier on a first storage element during at least a portion of a first time period;
- coupling the first comparator as a comparator and coupling the sense signal to the first storage element during at least a portion of a second time period;
- coupling a second comparator as a second amplifier, and storing an output of the second amplifier on a second storage element during the portion of the second time period;
- and
- coupling the second comparator as a comparator and coupling the sense signal to the second storage element during the first time period.
3 more elements
A method of forming a power supply controller comprising:
- configuring the power supply controller to receive a sense signal representative of a current through an inductor;
- coupling a plurality of comparators in parallel with each comparator coupled to receive the sense signal including coupling a capacitor in series with an input of each comparator of the plurality of comparators;
- configuring a first comparator of the plurality of comparators to store an offset of the first comparator on a first capacitor as a first stored value during at least a first portion of a first time period;
- and
- configuring a second comparator of the plurality of comparators to store an offset of the second comparator on a second capacitor as a second stored value during at least a first portion of a second time period.
2 more elements
A zero crossing detector comprising:
- a plurality of comparators coupled in parallel with each comparator having a capacitor coupled to an input of the comparator;
- and
- a first portion of the plurality of comparators configured as an amplifier to store an offset voltage of the amplifier as a first stored offset during at least a first portion of a first time period and a second portion of the plurality of comparators configured as comparators to compare a sense signal plus the first stored offset to a first reference signal during at least a second portion of the first time period.
Dependencies are inferred from the claim text.