Cooking Heater Control Using Phase-Based Input Voltage Detection
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Solution Overview
Problem
Existing cooking apparatuses face issues with burn-out and inefficient heating due to incorrect voltage application, as they rely on complex and costly overvoltage detection circuits and fixed resistance heaters, which are vulnerable to external noise and inefficient in adapting to varying input power specifications.
Innovation Solution
A cooking apparatus with multiple power input terminals, a detection circuit to identify the phase difference of input power, and a processor to control heater operation based on the identified voltage, preventing misconnection and optimizing heater usage according to the input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an overvoltage detection circuit is added to prevent burn-out, then the reliability of electronic components is improved, but the device complexity and material cost increase
Solution Approach 1:
The patent extracts the essential function of overvoltage detection from a complex dedicated detection circuit and implements it using the existing phase detection capability of the cooking apparatus. By reusing the phase detection circuitry already present in the system, the patent eliminates the need for additional overvoltage detection components while maintaining the protective function.
Solution Approach 2:
The phase detection circuit is made multi-functional by using it for both phase difference measurement (for power specification identification) and overvoltage detection (for burn-out prevention). This universal approach allows a single circuit to perform multiple protective and control functions, reducing overall device complexity.
2Reliability
If an overvoltage detection circuit is added to prevent burn-out, then the reliability of electronic components is improved, but the material cost increases
Solution Approach 1:
The phase detection circuit is made multi-functional by using it for both phase difference measurement (for power specification identification) and overvoltage detection (for burn-out prevention). This universal approach allows a single circuit to perform multiple protective and control functions, reducing overall device complexity.
Solution Approach 2:
The patent extracts the essential function of overvoltage detection from a complex dedicated detection circuit and implements it using the existing phase detection capability of the cooking apparatus. By reusing the phase detection circuitry already present in the system, the patent eliminates the need for additional overvoltage detection components while maintaining the protective function.
3Ease of manufacture
If a heater with fixed resistance value is used, then the manufacturing simplicity is improved, but the heating performance deteriorates when input voltage does not match specifications
Solution Approach 1:
The patent introduces dynamic control of heater operation based on detected power specifications. The processor adjusts heater operation (including on/off timing and power distribution) according to the detected voltage and phase difference, enabling the fixed-resistance heater to adapt its effective output to match different input voltage conditions (208V, 220V, 240V, etc.).
Solution Approach 2:
The patent changes the operational parameters of the heater based on detected input power specifications. By modifying control parameters (duty cycle, operating timing, power distribution) rather than physical heater parameters, the system optimizes heating output for different voltage inputs while keeping the heater hardware simple and fixed.
4Device complexity
If an oven cooking algorithm is developed based on 240V without detecting input power specification, then the control simplicity is improved, but the heating performance deteriorates in areas with different voltage supply
Solution Approach 1:
The patent performs preliminary detection of power specifications (voltage and phase difference) before executing the cooking algorithm. This preliminary action allows the system to identify the input voltage condition and select or adjust the appropriate cooking algorithm, ensuring optimal heating performance from the start of operation.
Solution Approach 2:
The patent introduces dynamic control of heater operation based on detected power specifications. The processor adjusts heater operation (including on/off timing and power distribution) according to the detected voltage and phase difference, enabling the fixed-resistance heater to adapt its effective output to match different input voltage conditions (208V, 220V, 240V, etc.).
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
The solution prevents burn-out and misconnection by accurately identifying and adapting to input voltage, ensuring safe and efficient operation of the cooking apparatus, reducing material costs and improving heating performance across different voltage inputs.
Implementation Method 1
a detection circuit which is connected to the power input terminals and for detecting the phase of power input into the power input terminals
Implementation Method 2
a plurality of heaters, a detection circuit which is connected to the power input terminals and for detecting the phase of power input into the power input terminals
Data Source
AI summary
A cooking apparatus and a controlling method, where the cooking apparatus includes a plurality of power input terminals, a plurality of heaters, a detection circuit connected to the power input terminals for detecting the phase of power input into the power input terminals, and a processor. The processor configured to identify a phase difference of input power based on an electronic signal of the power output from the detection circuit, and, based on the phase difference being within one of a plurality of threshold ranges, identify the voltage between live terminals among the plurality of power input terminals based on the phase difference of the power and control at least one heater among the plurality of heaters according to the identified voltage between the live terminals, and, based on the phase difference being outside the plurality of threshold ranges, stop the operation of the cooking apparatus.