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 Title: |
EP0927919B1:
Electronic thermostat control unit and its use in multipoint temperature controller for refrigeration and heating systems[German][French]
[ Derwent Title ]
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Country:
Kind: |
EP European Patent Office (EPO)
B1 PATENT SPECIFICATION i
(See also:
EP0927919A1 )
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| Inventor: |
Bhatnagar, Rajiv;
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| Assignee: |
Varma Trafag Limited
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| Published / Filed: |
2000-07-05
/ 1998-04-30
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| Application Number: |
EP1998000303413
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| IPC Code: |
Advanced:
F23N 5/20;
G01K 7/01;
G05B 11/00;
G05D 23/00;
G05D 23/19;
G05D 23/20;
G05D 23/24;
G05D 23/32;
H02J 13/00;
F25D 29/00;
Core:
G05D 23/30;
more...
Subclass:
F23N;
G05B;
G05D;
H02J;
IPC-7:
F23N 5/20;
G05B 11/00;
G05D 23/00;
G05D 23/19;
G05D 23/24;
G05D 23/32;
H02J 13/00;
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| ECLA Code: |
G05D23/24B; G05D23/20B2; G05D23/20D; G05D23/24D; R25D29/00;
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| Priority Number: |
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| Abstract: |
[From equivalent
EP0927919A1]
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 nonvolatile 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
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| Attorney, Agent or Firm: |
Mather, Belinda Jane ;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE
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| Family: |
Show 27 known family members
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First Claim:
Show all claims |
1. An electronic digital thermostat control unit comprising:
- - a p-n junction temperature sensing element,
- - a constant current source to drive the said p-n junction element,
- - the output of the said p-n junction element is connected to an analogue-to-digital converter to produce a digital output which is connected to a circuit for correcting the sensitivity and offset values of the sensor using calibration data stored in non-volatile memory,
- - the corrected output being connected to one input of at least one digital comparator and the other input of each digital comparator receiving a digital reference value from the said non-volatile memory or from variable control means,
- - the output of the said comparator(s) being filtered using digital noise filters and being stored in a control latch to set/reset the input of a control latch in dependence on the output of the digital comparator(s).
[German]
[French]
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Description
Expand description |
This invention relates to an electronic digital thermostat control unit and its use in a Multipoint Temperature Controller for Refrigeration and Heating Systems
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| Other Abstract Info: |
None
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