Heating Control Circuit with Power-Off Memory for Electric Kettles
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Solution Overview
Problem
Conventional electric kettles lack a power-off memory function, requiring users to restart the heating or keep warm mode if the device is moved or powered off during heat preservation, which is inconvenient.
Innovation Solution
A heating control circuit comprising a control module, zero-crossing detection circuit, thyristor switch circuit, and temperature control circuit that allows the device to automatically resume the heat preservation mode upon power restoration and maintain water temperature within a specified range, ensuring continuous heat preservation without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electric kettle is moved or powered off during heat preservation, then the power supply is interrupted, but the heat preservation function is lost and requires manual restart
Solution Approach 1:
The control module records the operation mode (heating or heat preservation) before power interruption occurs. When power is restored, the system automatically resumes the recorded operation mode without requiring user intervention, thus maintaining the heat preservation function's continuity and improving ease of operation
Solution Approach 2:
The system creates a memory copy of the operation state in the control module before power loss. This stored state information is retrieved after power restoration to automatically restart the appropriate function, eliminating the need for manual restart and ensuring functional reliability
2Power
If the thyristor switch circuit is fully conducted to enable heating, then the heating power is maximized, but the thyristor may burn out due to excessive current
Solution Approach 1:
The zero-crossing detection circuit detects the AC voltage zero-crossing points and triggers the thyristor to conduct only during specific portions of the AC cycle. This periodic control prevents continuous full conduction, limiting the thyristor's exposure to high current stress while still delivering adequate heating power, thus protecting the thyristor from burning out
Solution Approach 2:
The control module monitors the operation state and power delivery conditions, adjusting the thyristor conduction angle accordingly. By providing feedback control on when and how long the thyristor conducts, the system achieves effective heating while preventing excessive current that could cause thyristor failure, thereby balancing power output with component reliability
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 the electric kettle to retain its previous operation mode after power-off or movement, enhancing user convenience by automatically resuming heat preservation and preventing the thyristor from burning due to full conduction.
Implementation Method 1
the alternating current is applied to the input end of the zero-crossing detection circuit, the output end of the zero-crossing detection circuit is connected to the first end of the control module
Implementation Method 2
the second end of the control module is respectively connected to the signal input end and signal output end of the thyristor switch circuit, the alternating current is applied to the power supply input end of the thyristor switch circuit, the power supply output end of the thyristor switch circuit is connected to the heating component
Implementation Method 3
the power supply output end of the thyristor switch circuit is connected to the heating component
Implementation Method 4
the third end of the control module is connected to the temperature control circuit
Data Source
AI summary
Disclosed are a heating control circuit and a heating equipment. The control module is respectively connected with the zero-crossing detection circuit, the thyristor switch circuit and the temperature control circuit. The time is preset in the control module. If the heating control circuit is powered off, it will be powered on again within the preset time as the signal collected by the zero-crossing detection circuit triggers the conduction of the thyristor switch circuit to start the heating component, and resume the heat preservation mode, by which the body memory function is implemented; even if the heating control circuit is not powered on again within the preset time after the heating control circuit is powered off, the water temperature is detected through the temperature control circuit to realize the water temperature memory function.