Heating cooking device
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Solution Overview
Problem
High-frequency heating devices with rotary knobs consume excessive power and are prone to malfunctions due to radio wave noise or electrostatic noise, causing signal processing circuit malfunctions.
Innovation Solution
A heating cooking device with a microcomputer-controlled power supply that turns off power to the input means, such as a rotary knob, during data fetching periods to reduce energy consumption and reset the signal processing circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power is constantly supplied to the rotary knob IC for signal processing, then the device can continuously read input data, but consumed electric power increases
Solution Approach 1:
The patent implements periodic power supply to the rotary knob IC by controlling the power supply unit to alternately supply and stop power based on whether data reading is required. This periodic action maintains the capability to read input data when needed while significantly reducing power consumption during idle periods when no reading operation is performed.
2Reliability
If power is constantly supplied to the rotary knob IC, then the signal processing circuit remains operational, but the circuit becomes vulnerable to electrostatic noise and malfunctions
Solution Approach 1:
By periodically stopping power supply to the rotary knob IC when data reading is not required, the patent reduces the exposure time of the signal processing circuit to electrostatic noise and other harmful factors. This periodic power cycling maintains signal processing reliability while minimizing vulnerability to noise-induced malfunctions.
3Measurement precision
If the rotary knob uses an IC for signal processing, then data reading capability is improved, but the device experiences large power consumption and noise susceptibility
Solution Approach 1:
The patent maintains the IC-based rotary knob for accurate data reading but implements periodic power supply control. The power supply unit supplies power only when the microcomputer needs to read data from the rotary knob, and stops power supply during idle periods. This approach preserves the measurement precision and data reading capability while dramatically reducing overall power consumption.
Data Source
AI summary
A heating cooking device includes a heating means 1, a main control circuit 2, input means 7 including a rotary knob, a microcomputer 3, display means 4, a power supply circuit 5 and electric power opening/closing means 6. During a period that the microcomputer 3 does not fetch data from the input means 7, the microcomputer 3 set the electric power opening/closing means 6 to an OFF operation. Consequently, consumed electric power of the input means 7 can be reduced, and when a malfunction of a signal processing circuit of the input means 7 occurs due to radio wave noise or electrostatic noise, an operation of the signal processing circuit can be restored by a reset operation.