US3754241A — Apparatus for measuring phase difference

Claim 1

Independent Claim 344 words

Apparatus for measuring electrical phase differences between two AC signals of the same frequency wherein the phase difference between the signals may be smaller or greater than 2 pi radians comprising: first and second circuit means for phase matching the frequencies and phase of the two AC signals and for forming pulse signals having a repetition frequency corresponding to the frequency of said AC signals, first and second flip-flop means each having a set input and a reset input, means connecting the set input of said first flip-flop means to said first circuit means for receiving the pulse signals from said first circuit means, means connecting the set input of said second flip-flop means to said second circuit means for receiving said pulse signals from said second circuit means, a first clock pulse generator having a first output electrically connected to the reset input of said first flip-flop means and a second output electrically connected to the reset input of said second flip-flop means to thereby reset said first and said second flip-flop means in response to the output pulses of said first clock pulse generator; a first reversible counter having an add input and a subtract input, a first output for providing either a carry forward signal or a carry backward signal and a second output for providing a control signal corresponding to the computation of said reversible counter, means for connecting the output signals from one of said flip-flop means to the add input and the output signals from the other of said flip-flop means to the subtract input, a second clock pulse generator, a frequency converting circuit having a first and a second input, means for connecting the second output of said first reversible counter to said first input and the output of said second clock pulse generator to said second input, said frequency converting circuit being operable to change the repetition frequency of its output signal in accordance with the computation of said first reversible counter and a counter connected to receive the output signals of said frequency converting circuit.

Claim 2

Dependent Claim 344 words

Apparatus for measuring electrical phase differences between two AC signals of the same frequency wherein the phase difference between the signals may be smaller or greater than 2 pi radians comprising: first and second circuit means for phase matching the frequencies and phase of the two AC signals and for forming pulse signals having a repetition frequency corresponding to the frequency of said AC signals, first and second flip-flop means each having a set input and a reset input, means connecting the set input of said first flip-flop means to said first circuit means for receiving the pulse signals from said first circuit means, means connecting the set input of said second flip-flop means to said second circuit means for receiving said pulse signals from said second circuit means, a first clock pulse generator having a first output electrically connected to the reset input of said first flip-flop means and a second output electrically connected to the reset input of said second flip-flop means to thereby reset said first and said second flip-flop means in response to the output pulses of said first clock pulse generator; a first reversible counter having an add input and a subtract input, a first output for providing either a carry forward signal or a carry backward signal and a second output for providing a control signal corresponding to the computation of said reversible counter, means for connecting the output signals from one of said flip-flop means to the add input and the output signals from the other of said flip-flop means to the subtract input, a second clock pulse generator, a frequency converting circuit having a first and a second input, means for connecting the second output of said first reversible counter to said first input and the output of said second clock pulse generator to said second input, said frequency converting circuit being operable to change the repetition frequency of its output signal in accordance with the computation of said first reversible counter and a counter connected to receive the output signals of said frequency converting circuit.

Claim 3

Dependent Claim 48 words

Apparatus as set forth in claim 1 further including a second reversible counter connected to the first output of said first reversible counter and operable to respond to the carry forward signal to perform an add computation and to the carry backward signal to perform a subtract operation.

Claim 4

Dependent Claim 39 words

Apparatus as set forth in claim 1 further including phase inverter means having an input connected to receive the output of said first clock pulse generator and an output connected to the reset input of said second flip-flop means.

Claim 5

Dependent Claim 328 words

Apparatus for measuring electrical phase differences between two AC signals of the same frequency wherein the phase difference between the signals may be smaller or greater than 2 pi radians comprising: first and second circuit means for phase matching the frequencies and phase of the two AC signals and for forming pulse signals having a repetition frequency corresponding to the frequency of said AC signals, first and second flip-flop means each having a set input and a reset input, means for connecting the set input of said first flip-flop means to receive said pulse signals from said first circuit means to thereby set said flip-flop circuit, means connecting the set input of said second flip-flop means for receiving said pulse signals from said second circuit means to thereby set said second flip-flop means, a first clock pulse generator means having a first output for providing reset signals to said flip-flop circuits, means electrically connecting the reset input of said first and said second flip-flop means to the output of said first clock generator, a first reversible counter connected to receive the output signals from one of said flip-flop means as an add input signal and the output signal from the other of said flip-flop means as a subtract signal and being operable in response to said add and subtract signals to thereby perform an arithmetic computation and provide a control signal at one output and a carry forward or a carry backward signal at a second output, a second reversible counter connected to the second output and being operable to respond to the carry forward signal of said first reversible counter to perform an add operation and to the carry backward signal of the reversible counter to perform a subtract operation, means for converting the computation of said first reversible counter into the form of an analog signal and indicator means responsive to said analog signal for providing an indication corresponding to the output of said converting circuit.

Claim 6

Dependent Claim 328 words

Apparatus for measuring electrical phase differences between two AC signals of the same frequency wherein the phase difference between the signals may be smaller or greater than 2 pi radians comprising: first and second circuit means for phase matching the frequencies and phase of the two AC signals and for forming pulse signals having a repetition frequency corresponding to the frequency of said AC signals, first and second flip-flop means each having a set input and a reset input, means for connecting the set input of said first flip-flop means to receive said pulse signals from said first circuit means to thereby set said flip-flop circuit, means connecting the set input of said second flip-flop means for receiving said pulse signals from said second circuit means to thereby set said second flip-flop means, a first clock pulse generator means having a first output for providing reset signals to said flip-flop circuits, means electrically connecting the reset input of said first and said second flip-flop means to the output of said first clock generator, a first reversible counter connected to receive the output signals from one of said flip-flop means as an add input signal and the output signal from the other of said flip-flop means as a subtract signal and being operable in response to said add and subtract signals to thereby perform an arithmetic computation and provide a control signal at one output and a carry forward or a carry backward signal at a second output, a second reversible counter connected to the second output and being operable to respond to the carry forward signal of said first reversible counter to perform an add operation and to the carry backward signal of the reversible counter to perform a subtract operation, means for converting the computation of said first reversible counter into the form of an analog signal and indicator means responsive to said analog signal for providing an indication corresponding to the output of said converting circuit.

Claim 7

Dependent Claim 140 words

Apparatus for measuring electrical phase differences between two AC signals of the same frequency comprising first and second means for developing pulse signals corresponding to the frequency and phase of two AC signals being measured, a first and a second flip-flop circuit, means for applying individually to said flip-flop circuits the output pulse signals from the said first and second means for setting said first and said second flip-flops, respectively, a clock pulse generator having outputs connected to said flip-flop circuits for resetting said flip-flop circuits, a first reversible counter, means for applying to said counter the output signals of the said first flip-flop circuits as an add input signal and the output signals of said second flip-flop circuit as a subtract input signal, and means for developing the time mean value of the state of said first reversible counter.

Claim 8

Dependent Claim 140 words

Apparatus for measuring electrical phase differences between two AC signals of the same frequency comprising first and second means for developing pulse signals corresponding to the frequency and phase of two AC signals being measured, a first and a second flip-flop circuit, means for applying individually to said flip-flop circuits the output pulse signals from the said first and second means for setting said first and said second flip-flops, respectively, a clock pulse generator having outputs connected to said flip-flop circuits for resetting said flip-flop circuits, a first reversible counter, means for applying to said counter the output signals of the said first flip-flop circuits as an add input signal and the output signals of said second flip-flop circuit as a subtract input signal, and means for developing the time mean value of the state of said first reversible counter.

Claim 9

Dependent Claim 74 words

Apparatus as set forth in claim 5 wherein said means for developing the time mean value includes a frequency converting circuit, means for applying to said frequency converting circuit a clock signal and means connecting said frequency converting circuit to the output of said first counter such that the output pulse train from said frequency converting circuit is integrated over a period of time in comparison with the repeTitive period of said AC signals.

Claim 10

Dependent Claim 49 words

Apparatus as set forth in claim 6 further including a second reversible counter having its input connected to the output of said first reversible counter such that the carry forward and carry backward signals of said first reversible counter are received as add input and subtract input commands, respectively.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-08-20	1977-02-19	1977-08-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-08-20	1981-02-19	1981-08-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-08-20	1985-02-19	1985-08-21	$7700.00	Window Closed / Lapsed

Apparatus for measuring phase difference

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag