MEASURING THERMOELECTRIC TRANSDUCER OF ELECTRICAL POWER

摘要

A measuring thermoelectric transducer of electrical power consists of a resistor (1) and heat transducer (2) both situated upon a common thermally-insulated underlay (3). The resistor consists of an element whose instantaneous resistance value is electronically controllable by momentary value of an input signal. A controlled resistor based on a transistor represents a preferable solution of the invention. In that case, it is made possible to performer a simple control by means of a computing amplifier (4) in such a way that a transistor emitter is connected with an inverting input of the computing amplifier, and, the transistor's gate is connected with an input of the computing amplifier. Placing the second controlled resistor upon the common underlay to perform a substitution measuring is another preferable solution. As regards the thermal flow, a symmetric placing of two underlays (3) with the controlled resistors and heat transducers so as to compensate perturbing influences upon a measuring process is yet another preferable solution.