Electronic thermostat control unit and its use in multipoint temperature controller for refrigeration and heating systems
US6006996A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1998 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | May 12, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D29/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
This invention relates to an electronic digital thermostat consisting of a single p-n junction as the temperature sensing element connected to an A-D converter, a sensitivity and Offset Correction circuit, digital comparators, digital noise filters, a control latch, an output drive and protection circuit and a solid-state switch to produce the desired output, with user input in either analogue form using a potentiometer or digital form using a switch, with calibration and control data stored in non-volatile memory, and a display unit for displaying sensed or user-set temperature. This invention further relates to the application of the said electronic digital thermostat in a multipoint temperature controller for Refrigeration and Heating systems, using a plurality of the said electronic thermostat control units with a logic circuit, Central Control Unit, 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) to provide reduced size and cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.