Sequential logic regulator circuit - controls process according to largest or smallest of several physical measurements

摘要

The sequential logic regulator circuit is able to adjust an installation by recognising the smallest or largest of several measured values and can compare with a given reference value. For example, a temperature probe (1) is connected into a Wheatstone bridge (2). Its amplified output (3) goes to a voltage controlled oscillator (5), whose output is counted (6) for a preset number of cycles, when it produces an output signal (7). A reference value (c) applied to an identical circuit (9, 10, 12, 13) produces an output (14) corresponding to the reference temperature. The counter outputs pass to AND gates (15, 17) for comparison and operate a control unit (52) via triacs (19a, 20a).