Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1989-12-27
1991-12-10
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
307511, 324 83R, G01R 21127
Patent
active
050721739
ABSTRACT:
A phase detector includes a pulse amplitude modulator and an integrator. The pulse amplitude modulator comprises a change-over switch the control input of which is fed by pulses which are subjected to mark/space modulation by means of a phase-shifted signal while the amplitude input of the pulse amplitude modulator is fed by a non-phase-shifted signal. The integrator includes an integrating amplifier, the output of which is connected by means of a capacitor to an inverting input of the integrating amplifier while the non-inverting input of the integrating amplifier is connected to ground by way of a further capacitor. The inverting and non-inverting inputs of the integrating amplifier are connected by way of respective resistors to two inputs of the integrator which in turn are connected to ground by way of respective resistors on the one hand and which on the other hand are connected by way of respective switch contacts of the change-over switch to the amplitude input of the pulse amplitude modulator. The phase detector requires only a single amplifier and may be used in phase-lock loops of static electricity meters which operate using the mark/space amplitude modulation method and which serve for the measurement of reactive energy, and which therefore require a 90.degree. phase shift provided by the phase-lock loop.
REFERENCES:
patent: 3602843 (1971-08-01), De Vries
patent: 4217545 (1980-08-01), Kusui et al.
patent: 4315212 (1982-02-01), Gamoh
patent: 4594547 (1986-06-01), Halder
patent: 4859937 (1989-08-01), Milkovic
Frutiger Theo
Halder Mathis
Karlsen Ernest F.
Landis & Gyr Betriebs AG
LandOfFree
Phase detector for mark/space modulated signals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phase detector for mark/space modulated signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase detector for mark/space modulated signals will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1043226