| 摘要 |
<p>An infra-red heater arrangement for a glass-ceramic top cooking appliance includes a heater connected to a manually adjustable cyclic energy regulator (10) having a full power setting and a plurality of other, lower power, settings. The heater incorporates at least one infra-red heating element (5) having a substantial positive temperature coefficient of electrical resistance and first and second electrical resistance heating elements (6, 7) having low temperature coefficients of electrical resistance relative to that of the at least one infra-red heating element. Means is provided for connecting the first electrical resistance heating element (6) in series with the at least one infra-red heating element (5) and to a power supply (9) in the full power setting of the cyclic energy regulator (10), which setting is attainable directly from an 'OFF' setting of the regulator. The infra-red heating element (5) and the first and second electrical resistance heating elements (6, 7) are provided in an undivided heating zone and means is provided for connecting the first and second electrical resistance heating elements (6, 7) in series and in series with the at least one infra-red heating element (5), and to the power supply (9), for cyclic energisation, at duty cycles including 100 percent, in the other settings of the cyclic energy regulator (10). <IMAGE></p> |
