| 摘要 |
<p>The invention concerns a static kwh meter, which comprises members (12,13) connected to the wires of the electricity network for the generation of measurement signals (Uu,Ii) proportional to the voltage (U) and to the current (I), while the secondary circuit of the current measurement converter (13) comprises analog connectors (K1,K2), a multiplier circuit (11,14) for the formation of a pulse-width/pulse-height modulated signal that represents the product of the measurement signals (Uu,Ii), integration members supplied by the outputs of the pulse-width/pulse-height multiplier (14) in the converter circuit, from which a frequency signal is obtained, which is proportional to the power and which is passed through a divider circuit (16) to the counter (17) of the kwh meter for determination of the energy that has been consumed. The secondary circuit of the current measurement converter (13) of each phase is a multiplier circuit (14), which is connected with analog connectors (K1,K2) that operate in opposite phases, said analog connectors being controlled by the pulse sequence received from a pulse-width modulator (11). The direct currents (+Ip,-Ip) received from the analog connectors (K1,K2) of the multiplier circuit (11,14), which are proportional to the power and of opposite signs, are fed to at least two current-frequency converters (15a,15b), whose output frequencies (f1,f2) are summed in a summing unit (18), and the sum frequency (f1 + f2) that is formed is the ultimate frequency proportional to the power. <IMAGE></p> |
