Cooling Device Control Circuit for Sabbath-Compliant Door Operation
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Solution Overview
Problem
Cooling devices like refrigerators face the challenge of violating religious prohibitions during Sabbath by changing operation when their doors are opened, as this is considered a non-obligatory physical action.
Innovation Solution
A control circuit with a Sabbath select switch and door sensing switch, connected in specific configurations with resistors, allows the control unit to distinguish between door states and Sabbath selection, ensuring no operational changes during door openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the cooling device automatically changes operation when the door is opened (standard control function), then energy efficiency is improved, but religious requirements for Sabbath observance are violated
Solution Approach 1:
The control circuit dynamically changes its response behavior based on the Sabbath mode selection. When Sabbath mode is activated, the system suppresses automatic operational changes that would normally occur upon door opening, allowing the compressor and other components to maintain their current state regardless of door position. This dynamic adaptability resolves the contradiction by enabling the system to switch between energy-efficient automatic control and Sabbath-compliant static operation.
Solution Approach 2:
The invention changes the control parameter state by introducing a Sabbath mode flag that modifies how door sensor signals are processed. In normal mode, door opening triggers operational parameter changes (compressor shutdown, fan control). In Sabbath mode, the same door opening event does not trigger parameter changes. This parameter change approach allows the system to maintain different operational behaviors for different religious compliance requirements.
2Loss of energy
If the control circuit processes door opening signals to change component operation, then energy efficiency is improved, but the cooling device becomes unsuitable for Sabbath use
Solution Approach 1:
The control circuit is segmented into two operational paths: normal operation mode and Sabbath mode. The Sabbath select switch creates a distinct control pathway that bypasses the automatic door-response logic. This segmentation allows the same physical door opening event to result in different control actions depending on the selected mode, making the device usable during Sabbath while maintaining energy efficiency during normal operation.
Solution Approach 2:
The Sabbath select switch acts as an intermediary element that mediates between the door sensor signal and the component control logic. When activated, this intermediary blocks or modifies the signal transmission that would normally trigger operational changes, allowing Sabbath compliance without requiring complex software overrides or additional hardware sensors.
3Device complexity
If a simple door switch is used to detect door state, then device complexity is reduced, but the ability to distinguish between door events and Sabbath selection is lost
Solution Approach 1:
The invention merges the Sabbath select switch and door sensing switch into a single control circuit architecture that processes both signals through shared components (resistors, control unit). This merging allows the system to distinguish between different signal sources (Sabbath selection vs. door opening) while using a unified, relatively simple circuit design. The control unit analyzes the pattern and timing of signals to accurately determine user intent without requiring completely separate detection systems.
Data Source
Figure 1
AI summary
The cooling device according to the present invention comprises at least one body; at least one inner compartment located in the body for placing the items to be cooled; at least one door providing access into the inner compartment; at least one cooling system for cooling the inner compartment; and at least one control circuit. Here, the control circuit comprises at least one power source (1); at least a first resistor (R1) connected to the power source (1); at least a second resistor (R2) connected in series to a side of the first resistor (R1) that is not connected to the power source (1); at least one door sensing switch (2), which is connected in parallel to the first resistor (R1) for detecting an open state or a closed state of the door; at least one sabbath select switch (3) connected in series to at least a third resistor (R3) and connected in parallel to the first resistor (R1) together with the third resistor (R3); at least one control unit (4) connected to the second resistor (R2) on the side not connected to the first resistor (R1), wherein the control unit (4) detects the states of opening the door, closing the door and selection of Sabbath based on the information on current received from the second resistor (R2), and controls operation of at least one component in the cooling device according to the detected state information.