Circuit for compensating for temporal instabilities of the multiplier circuit with hall - sensors in a watt meter or electricity meter

摘要

Circuit for compensating for temporal instabilities a multiplication circuit with hall - sensors in a watt meter or an electricity meter, characterized in that at a first input terminal (i1) a first controlled four terminal network - switching circuit (3) an electric current (i -), the current direction, with a first frequency (f_c1) changes, which is supplied to a first of the two multiplicand in the product at the output of the multiplier circuit, and a first output terminal (o1) of the first four terminal network - switching circuit (3) to the power terminal may be provided (4 '') of a first hall - sensor (4) is connected and the voltage clamp (4 ") by means of a first amplifier (6) to a first input terminal (i1'') of a second four terminal network - switching circuit (8) to the signal input (s) of a first voltage - frequency - transducer (9) is connected, whose digital output (d) to the output terminal (o) of the circuit is connected to a second input terminal (i2) of the first four terminal network - switching circuit (3) a reference current (i_r) a second frequency (f_c2) is supplied and a second output terminal (o2) of the first four terminal network - switching circuit (3) to the power terminal may be provided (5 '') of a second hall - sensor (5) is connected and its voltage clamp (5 ") by a second amplifier (7) to a second input terminal (i2'') of the second four terminal network - switching circuit (8) is connected, that the first four terminal network - switching circuit (3) and the second four terminal network - switching circuit (8) with the same signal a frequency (f_M) in a half period, at the same time, in such a way as to connect . . .