Phase angle determination of ac signals
AssigneeQUALCOMM Incorporated
InventorsSaeed Nejatali, Linda Irish, David Fern, Francesco Carobolante, II
Life of this patent
Estimating the term…
Abstract
Methods and circuitry are disclosed to produce a first signal representative of the AC voltage signal and a second signal representative of an AC current signal. The first and second signals may be combined with a clock signal to produce a third signal. A phase angle between the AC voltage signal and the AC current signal may be determined based on a pulse count indicative of how many pulses occur in the third signal over a predetermined period of time.
Claims26
A method for determining phase angle in alternating current (AC) signals comprising:
- generating a first signal representative of an AC voltage signal;
- generating a second signal representative of an AC current signal;
- combining the first and second signals with a clock signal to produce a third signal;
- and
- producing phase angle information representative of a phase angle between the AC voltage signal and the AC current signal based on a pulse count indicative of how many pulses occur in the third signal over a predetermined period of time.
A method for determining phase angle in alternating current (AC) signals comprising:
- generating a first square wave signal representative of an alternating current (AC) voltage signal;
- generating a second square wave signal representative of an AC current signal;
- generating a third square wave signal by combining at least the first square wave signal and the second square wave signal;
- determining a phase angle between the AC voltage signal and the AC current signal based on how many pulses occur in the third square wave in a predetermined period of time.
A circuit for determining phase angle in alternating current (AC) signals comprising:
- a first circuit configured to generate a first signal representative of an alternating current (AC) voltage signal;
- a second circuit configured to generate a second signal representative of an AC current signal;
- a third circuit electrically connected to the first and second circuits and configured to combine the first and second signals with a clock signal to produce a third signal;
- a counter electrically connected to the third circuit and configured to produce a pulse count representative of a number of pulses occurring in the third signal over a predetermined period of time;
- and
- a computing circuit electrically connected to the counter and configured to produce phase angle data representative of a phase angle between the AC voltage signal and the AC current signal using the pulse count.
A circuit for determining phase angle in alternating current (AC) signals comprising:
- means for generating a first square wave signal representative of an alternating current (AC) voltage signal;
- means for generating a second square wave signal representative of an AC current signal;
- means for generating a third square wave signal from the first square wave, the second square wave, and a clock signal;
- and
- means for producing phase angle data based on a number of pulses that occur in the third square wave signal in a predetermined period of time.
Dependencies are inferred from the claim text.