Multipoint digital temperature controller
US6336593B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 2001 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Jan 4, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1917
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
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 sensitivityand 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 for the refrigerant 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.