| 摘要 |
<p>The present invention relates to an electronic digital thermostat control unit comprising a linear temperature sensing element (1) connected to an A-D converter (3), a sensitivity and offset correction circuit (4), digital comparators (5, 6), digital noise filters (7, 8), a control latch (9), an output drive and protection circuit (10) and a solid state switch (11) to produce the desired output with user input in either analogue form using a potentiometer (12) or a digital form using a switch with calibration and control data stored in a nonvolatile memory and a display unit (18) for displaying sensed or user set temperature. The invention further relates to the application of the said electronic digital thermostat in a multipoint temperature controller for the refrigeration and heating systems using a plurality of said electronic thermostat control units (40-44) with a logic circuit, central control unit (71), system timers and a starting relay circuit to provide application specific functions. The implementation is also shown in the form of an Application Specific Integrated Circuit (ASIC) (32) to provide reduced size and cost.</p> |
