Analog Oven Clock With Minute Programming and Low Standby Power
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Solution Overview
Problem
Traditional analog oven timers lack functionality for delayed programming and exact minute resolution, and they consume high energy, especially in standby mode, which is aesthetically unappealing and not user-friendly for older users.
Innovation Solution
An analog oven clock with a stepping motor-driven hour and minute hand system, controlled by a microcontroller, allowing for intuitive programming of cooking cycles with 1-minute resolution, and a power-saving zero-crossing circuit to reduce energy consumption in standby mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional analog clock hands are used for timing, then aesthetic appeal and ease of operation are improved, but delayed programming capability and exact minute resolution are lost
Solution Approach 1:
The clock hands serve multiple functions: they display the current time, indicate the delayed start time, and show the cooking duration. This multi-functionality allows the analog clock to provide delayed programming capability without adding digital displays or multiple hands, resolving the contradiction between aesthetic simplicity and programming versatility
2Shape
If traditional analog clock hands are used for timing, then aesthetic appeal is improved, but energy consumption increases
Solution Approach 1:
The clock hands are driven by a stepping motor that operates periodically rather than continuously. The motor receives pulse signals from the microcontroller to advance the hands one minute at a time, consuming energy only when needed to update the display, thus significantly reducing standby power consumption while maintaining the aesthetic analog appearance
3Adaptability or versatility
If additional hands are added to indicate cooking duration and start time, then programming capability is improved, but device complexity increases
Solution Approach 1:
The clock face is divided into different functional zones: the outer ring indicates the delayed start time, the inner ring shows the cooking duration, and the center displays the current time. This segmentation allows multiple pieces of information to be displayed using a single hand, avoiding the complexity of multiple hands while maintaining full programming capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables intuitive delayed programming and low energy consumption while maintaining a traditional aesthetic, allowing users to set cooking times and alarms effectively with minimal energy usage.
Implementation Method 1
The hands (L1, L2) are rotated by a stepping motor (M)
Implementation Method 2
The zero-crossing circuit (ZC) connected to a power supply (A) taking the alternating current from the mains to power the microcontroller (MC) and the devices connected to it
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A clock (1) for household appliance is disclosed, comprising: hands (L1, L2) to tell the time, a stepping motor (M) to actuate said hands, icons (I1-I5) to indicate clock functions, a switch (SW) to control the switch-on/off of the appliance according to a time period set by the user, a microcontroller (MC) connected to the stepping motor (M), icons (I1-I5) and switch (SW) to control the operation of these devices, buttons (T1, T2, T3) connected to the microcontroller (MC) and actuated by the user to select and control the clock functions, and a power supply (A) connected to the mains to power said microcontroller (MC).