Electronic Transformer Frequency Control for Stable Microwave Power
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Solution Overview
Problem
Microwave ovens face instability in output power due to fluctuating AC voltage, leading to poor user experience and high production costs for frequency converters, which require communication devices for continuous power adjustments.
Innovation Solution
An electronic transformer with a rectifier device, transformer, switch device, and control device that stabilizes output voltage by controlling switching frequency and providing on/off signals, eliminating the need for communication devices and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frequency converter is used to increase voltage for the magnetron, then the output power can be adjusted, but the production cost increases due to the need for communication devices and continuous power adjustments
Solution Approach 1:
The patent removes the communication device from the frequency converter by integrating the control function directly into the transformer. The transformer now directly receives control signals from the microwave oven controller and adjusts its switching frequency accordingly, eliminating the need for separate communication modules while maintaining power adjustment capability.
Solution Approach 2:
The control function and power adjustment capability are merged into the transformer itself. The transformer incorporates a control circuit that directly responds to control signals from the microwave oven controller, combining what were previously separate functions (frequency converter + communication device) into a single integrated unit.
2Adaptability or versatility
If the AC source voltage fluctuates, then the frequency converter can adjust power continuously, but the user experience deteriorates due to abnormal operation and poor stability
Solution Approach 1:
The transformer incorporates a control circuit that receives control signals from the microwave oven controller and adjusts its switching frequency in response to AC source voltage fluctuations. This feedback mechanism ensures stable output power by dynamically compensating for input voltage variations, improving reliability while maintaining adaptability.
3Ease of operation
If communication devices are added to the frequency converter for continuous power adjustments, then power control is improved, but the manufacturing cost increases
Solution Approach 1:
The patent eliminates the communication device by integrating the control function directly into the transformer. The transformer now directly receives and responds to control signals from the microwave oven controller, maintaining precise power control capability while removing the expensive communication module, thus reducing manufacturing costs.
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 electronic transformer provides stable output voltage and reduces manufacturing costs by eliminating the need for communication devices and minimizing power adjustments, enhancing user experience through improved power stability.
Implementation Method 1
a transformer connected to the rectifier device
Data Source
AI summary
An electronic transformer and a microwave cooking appliance. The electronic transformer includes a rectifier device, a transformer, a switch device, and a control device. The rectifier device is connected to an alternating current source; the transformer is connected to the rectifier device; the switch device is configured to provide an on/off signal to the transformer; the control device is connected to the switch device; the control device is configured to generate a control signal according to preset power and provide the control signal to the switch device to control the switching frequency of the switch device.