Adjustable electronic temperature control, especially for refrigerators or the like
US4314666A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1979 |
| Grant date | Feb 9, 1982 |
| Priority date | — |
| Expiry date | Sep 26, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Adjustable electronic temperature control, having a bridge circuit with arms and at least one diagonal connected between points of the bridge, a thermistor for sensing temperature connected in one of the arms, a control circuit to be activated by the temperature control, a circuit for activating an indicating and safety device, at least two amplifiers for switching the control circuit and indicating and safety circuit on and off, means connected in the at least one diagonal for supplying a control voltage to the amplifiers, a plurality of resistors connectible in parallel in another arm for setting a setpoint temperature in the temperature control, the resistors having values increasing in a binary code, and at least one coding switch for selectively connecting the resistors in parallel in accordance with given temperature steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.