Home Appliance Switch Circuit for Sticking Fault Detection
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Solution Overview
Problem
Existing domestic appliances, such as washing machines and dryers, lack effective methods to detect the proper functioning of electrical switches, particularly to identify 'sticking' switch errors that can lead to unsafe operation.
Innovation Solution
A circuit arrangement with a control unit and feedback pole that couples electrical loads via a common and separate switch, allowing for the detection of faulty switches through a single feedback channel, ensuring safe operation by checking switching states before appliance startup and during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate feedback channels are used to monitor each electrical switch, then the detection reliability of switch faults is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple feedback channels into a single common feedback channel that monitors all electrical switches collectively. Instead of having separate feedback paths for each switch, the invention merges them so that the control unit can detect the state of all switches through one unified channel, thereby reducing system complexity while maintaining detection capability
Solution Approach 2:
The common feedback channel serves multiple functions: it monitors the state of all electrical switches simultaneously, provides fault detection for multiple components through a single path, and enables the control unit to identify which specific switch is faulty by analyzing the collective feedback signal. This multi-functional approach eliminates the need for dedicated feedback channels for each switch
2Reliability
If electrical switches are monitored continuously, then the safety of appliance operation is improved, but the energy consumption increases
Solution Approach 1:
The control unit performs periodic sampling of the feedback channel at intervals rather than continuous monitoring. This periodic action allows the system to detect switch faults effectively while consuming less energy, as the control unit can enter low-power states between sampling events while still maintaining safety through regular status checks
Data Source
Figure 1~2
AI summary
The circuit arrangement (1) has a control unit (10) for controlling the processes of domestic appliance and two electrical loads, particularly an electric motor (5) and a heater (6), which are coupled with an input connection (3) of an inlet (2) of the circuit arrangement by a common electric switch (7). A rear coupling terminal (15) is provided between the common electric switch and separate electric switches (8,9). The rear coupling terminal is coupled with a test input (17) of the control unit. An independent claim is included for a method for operating a household appliance, particularly for maintenance of laundry pieces.