| 摘要 |
A food warmer having closed loop heating control (24) has a temperature sensor (14) in a warming zone (13) of the food warmer. The temperature sensor (14) has a rate of heat absorption and a rate of heat loss substantially the same as a food product (12) contained in the warming zone. First (16) and second (20) heat sources provide heat to the warming zone. The heat required to maintain the warming zone at a desired temperature requires heat from both the first and second heat sources. The first heat source (16) is operated continuously while the second heat source (20) is activated and deactivated in closed loop fashion based on input from the temperature sensor (14) to maintain a desired set point temperature of the warming zone. |
