Boots – shoes – and leggings
Patent
1978-07-31
1980-09-23
Gruber, Felix D.
Boots, shoes, and leggings
324142, 340347NT, 364841, G01R 1132, G06G 716
Patent
active
042246717
ABSTRACT:
Disclosed is an arithmetic operation apparatus for an electrical watt-hour meter for cumulatively adding products arrived at by multiplying two input signals in succession which correspond respectively to a line voltage and line current. The apparatus comprises a pulse width modulator for modulating a first input signal of line voltage into the form of a pulse width for each sampling period. A certain number of the sampling periods is taken as a first arithmetic operation period (hereinafter referred to as "a first unit operation period"). During the first unit operation period, a second input signal of line current is supplied for a length of time corresponding to each modulated pulse width of the first input signal. The second input signals thus supplied are integrated by a first integrator during each first unit operation period. During a succeeding operation period consisting of the same specified number of sampling periods (hereinafter referred to as "a second unit operation period"), a reference signal which has a polarity opposite to that of the integrated signal at the end of the first unit operation is reversely integrated by the first integrator. During the second unit operation period in which the above-mentioned reverse integration is carried out, the second input signal which is to be integrated for a length of time corresponding to the modulated pulse width of the first input signal is conducted to a second integrator to be integrated during the respective sampling periods. Each of the first and second integrators alternately carries out the integration and the reverse integration during the alternately recurring first and second unit operation periods following the aforesaid ones.
A counter counts a number of clock pulses issued for a length of time varying with the reverse integration applied each time. The number of clock pulses thus counted are added in succession, thereby determining a cumulatively added sum of the multiplication products of the first and second input signals which corresponds to a watt-hour value.
REFERENCES:
patent: 3466460 (1969-09-01), Connolly
patent: 3610910 (1971-10-01), Udall
patent: 3746851 (1973-07-01), Gilbert
patent: 3749894 (1973-07-01), Avdeef
patent: 3757099 (1973-09-01), Anderson
patent: 3780273 (1973-12-01), Turrell
patent: 3955138 (1976-05-01), Milkovic
patent: 4056775 (1977-11-01), Milkovic
patent: 4066960 (1978-01-01), Milkovic
Stockton: New Form of Digital Wattmeter using Double Dual-Slope Principle, Electronics Letters, Jul. 7, 1977, (in 369-483), vol. 13, No. 14, pp. 406, 407.
Sugiyama Fumio
Tashiro Isao
Gruber Felix D.
Tokyo Shibaura Denki Kabushiki Kaisha
LandOfFree
Arithmetic operation apparatus for an electronic watt-hour meter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Arithmetic operation apparatus for an electronic watt-hour meter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arithmetic operation apparatus for an electronic watt-hour meter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-647771