Signal averager for use with motor controller

A signal averager for use with a motor controller for determining the average value of a voltage signal, the controller determining first and second calibrating constants, the averager comprising:

• a first analog integrator integrating the voltage signal during all primary periods to produce a primary signal for each primary period, the primary signal being proportional to a first cumulative value of the voltage signal during the preceding primary period;
• a second analog integrator integrating the voltage signal during all secondary periods to produce a secondary signal for each secondary period, the secondary signal being proportional to a second cumulative value of the voltage signal during the preceding secondary period, wherein the primary and secondary periods alternate and are successive;
• a selector that samples each primary signal during a first part of a following secondary period and samples each secondary signal during a first part of a following primary period;
• a discharger for setting the primary signal equal to zero during the following secondary period after the selector samples the primary signal and setting the secondary signal equal to zero during the following primary period after the selector samples the secondary signal;
• and
• a calibrator mathematically combining the primary signal with the first calibrating constant to produce a first average signal and mathematically combining the secondary signal with the second calibrating constant to produce a second average signal, each of the first and second average signals being an average value of the voltage signal.

A method to be used with a motor controller and analog circuitry for determining a continuous stream of average values of a voltage signal during consecutive and alternating integration periods to produce a series of integrated values;

• integrating the voltage signal during consecutive and alternating integration periods to produce a series of integrated values;
• maintaining each integrated value for a sample period after integration and during a following integration period;
• sampling each integrated value during the sample period each sampled value proportional to the cumulative value of the voltage signal during one of said periods;
• multiplying each integrated value by a calibration constant to produce the average value of the voltage signal;
• and
• setting each integrated value equal to zero after the integrated value is sampled.