EP 0688434 A1 19951227 - POWER METER
Title (en)
POWER METER
Title (de)
LEISTUNGSMESSGERAT
Title (fr)
COMPTEUR ELECTRIQUE
Publication
Application
Priority
- GB 9400492 W 19940311
- GB 9305230 A 19930313
Abstract (en)
[origin: GB2285693A] An apparatus for measuring electrical power is described wherein the apparatus is adapted to produce an output signal proportional to the product of a supply voltage and current flowing through a connected load. A first signal proportional to the supply voltage and a second signal proportional to the load current are used to inverse modulate (at 5 and 4 respectively Fig. 1 not shown) the period of two constant frequency carrier signals. Third and fourth signals derived from the modulated signals are transmitted to a microprocessor, for example via electrical isolating devices 7 and 6. Intervals between successive pulses at 10 are digitised by subtracting counts of a cycling counter at successive pulses. The average interval corresponding to zero voltage is subtracted to give an instantaneous voltage value which is multiplied with a similarly derived current value to give instantaneous power consumption. <IMAGE>
IPC 1-7
IPC 8 full level
G01R 19/252 (2006.01); G01R 21/133 (2006.01)
CPC (source: EP)
G01R 19/252 (2013.01); G01R 21/133 (2013.01)
Citation (search report)
See references of WO 9422024A1
Designated contracting state (EPC)
AT BE DE DK ES FR GR IE IT NL SE
DOCDB simple family (publication)
GB 2285693 A 19950719; GB 2285693 B 19970521; GB 9506331 D0 19950517; AU 6212894 A 19941011; AU 679729 B2 19970710; EP 0688434 A1 19951227; ES 2081786 T1 19960316; FI 954297 A0 19950913; FI 954297 A 19951013; GB 2276011 A 19940914; GB 2276011 B 19970514; GB 2285692 A 19950719; GB 9305230 D0 19930428; GB 9506330 D0 19950517; GR 960300002 T1 19960229; JP H08507609 A 19960813; NO 953609 D0 19950913; NO 953609 L 19950913; WO 9422024 A1 19940929
DOCDB simple family (application)
GB 9506331 A 19930313; AU 6212894 A 19940311; EP 94909198 A 19940311; ES 94909198 T 19940311; FI 954297 A 19950913; GB 9305230 A 19930313; GB 9400492 W 19940311; GB 9506330 A 19930313; GR 960300002 T 19960229; JP 52075994 A 19940311; NO 953609 A 19950913