| 摘要 |
<p>939,052. Automatic temperature control systems. REGULATOR A.G. Dec. 5, 1961 [Dec. 6, 1960], No. 43408/61. Class 38 (4). An automatic control system for an air conditioning plant using thermistors as temperature sensitive elements to give say a rising room temperature on each side of a datum, comprises a resistor bridge circuit R1, R2, R5, R6, having resistor diagonals R3, P1, P2 and a thermistor R4 sensitive to outside temperature. Due to the diodes D1, D2, whether the thermistor resistance is above or below the datum value, the circuit output will be positive in relation to earth. The circuit is in series with a bridge network comprising resistors r 1 -r 3 and thermistor TH sensitive to inside temperature, hence the lower bridge modifies the output of the upper bridge. By adjustment of the two circuits, the output characteristic of the system may rise or fall on each side of the datum, say 20‹ C. and may even be flat around the datum point. Other arrangements providing particular temperature characteristics are described in the Specification. The thermistor R4 may be replaced by a light sensitive or humidity sensitive device.</p> |
