摘要 |
A circuit for sensing instantaneous current and voltage generates a digital output which indicates the power consumed over a time interval. The analog product of sensed current and voltage is converted to a pulse train in which each pulse represents a plus or minus increment of power. These pulses are either added to or subtracted from a total accumulated power number which is stored in a digital counter. The contents of the digital counter is coupled to a display to provide a readout of total consumed power.
|