Abstract
In adaptive control systems such as a process control system, a learning system or an automatic designing device, analog memory elements with multiplying function are required. Such an analog memory element with multiplying function was realized by using a toroidal core with rectangular hysteresis loop. Having the core partially magnetized by voltage pulses along the easy direction, and applying two sinusoidal magnetic fields with frequencies of 1/7MHz and 1/8MHz, a beat frequency component (1/56MHz) of the induced voltages is detected as an output signal corresponding to the stored flux level. Two kinds of elements were obtaind, depending whether the magnetic field was applied along the easy direction or along the hard direction. The one obtained by applying the field along the hard direction provides a beat frequency output voltage VΔ proportional to the algebraic product of two exciting currents (AC) I1, I2 and stored flux φ. The range of inputs I1, I2 and φ is 0∼0.5A, 0∼0.5A and -1.5×10-3∼+1.5×10-3volt-second, respectively. The accuracy (Verror/Vmax) with respect to I1, I2 and φ is 3, 3 and 7%, respectively. The inditial response time with respect to I1, I2 and φ is 2.8ms. In addition to the multiplying function, the analog memory element shows the advantage of being a simplified filter, and of having no mismatching of the two cores and etc., in comparison with ordinary magnetic analog memory elements. The element shows a possibility to realize a Two Dimensional Read-Out system.
