| 摘要 |
<p>1530300 Temperature control N V PHILIPS GLOEILAMPENFABRIEKEN 22 Oct 1975 [25 Oct 1974] 43343/75 Heading G3R In an arrangement whereby one and the same temperature sensor 23 controls two (or more) on/ off outputs 35, 36 to operate at different temperatures, the sensor comprises one arm of a bridge 23, 24, 30, 31 connected as shown to two (or more) differential amplifiers 20, 21. The latter have a common reference input 22 but their other inputs 29 and 32, though derived from the same point on the bridge, are different. The difference may be ensured by a potential divider 33, 34 associated with one of them or Fig. 2 (not shown), by a bias potential applied to one of them. In Figs. 1 and 2, one of the outputs may operate the fan of a storage heater and the other may operate a supplementary heater. Fig. 3 (not shown), depicts an arrangement whereby a fan and a supplementary heater not only have different operating temperatures but also change these temperatures in different tariff periods (e.g. day and night).</p> |
