Induction Heating Converter Frequency Modulation for Data Transmission
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Solution Overview
Problem
Existing methods for transmitting data from an induction heating device to an inductively heatable cooking vessel are inefficient and require additional transmitters, leading to increased costs and potential interference.
Innovation Solution
Encoding data onto the control frequency of the induction heating device's alternating magnetic field, allowing the existing converter to handle data transmission without additional transmitters, and enabling bidirectional communication to optimize data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an additional dedicated transmitter is used for data transmission, then data transmission capability is improved, but device complexity and cost increase
Solution Approach 1:
The existing converter, originally designed solely for power conversion, is made multi-functional by enabling it to also perform data transmission. The converter modulates data onto the drive frequency signal, allowing a single device to serve both power conversion and communication functions, thereby eliminating the need for a separate dedicated transmitter.
Solution Approach 2:
The data transmission function is merged with the existing converter function. By combining these two separate functions into one device, the patent reduces the number of components needed in the system, simplifying the overall device architecture and reducing costs while maintaining full data transmission capability.
2Loss of information
If drive frequency is changed to encode data, then data transmission is enabled, but heating power may be disrupted
Solution Approach 1:
Data is encoded by periodically modulating the drive frequency around its base value. The frequency is varied in a periodic manner corresponding to the data bits being transmitted, allowing information encoding while maintaining the fundamental periodic nature of the heating signal. This periodic modulation enables data transmission without fundamentally altering the heating function.
Solution Approach 2:
The drive frequency parameter is dynamically changed to encode data bits. By varying the frequency parameter within a controlled range around the base frequency, the patent achieves data encoding while keeping the changes small enough to maintain effective heating power transfer to the cooking vessel.
3Loss of information
If frequency modulation is used for data transmission, then data exchange is enabled, but audible interference may occur
Solution Approach 1:
The frequency is modulated within a very narrow range (0.1% to 5% deviation from base frequency) to encode data. These minimal frequency changes are sufficient for reliable data detection by the receiver but remain inaudible to humans, thereby avoiding audible interference while enabling effective data transmission.
4Productivity
If bidirectional communication is implemented, then data exchange efficiency is improved, but system complexity increases
Solution Approach 1:
Bidirectional communication is achieved by having both the converter and the receiver capable of transmitting and receiving modulated signals. The receiver can respond to the heating device's queries and the heating device can request data from the receiver, creating efficient bidirectional exchange without requiring separate dedicated transmitter and receiver systems for each direction.
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
This method allows for cost-effective and interference-free data transmission with minimal disruption to heating power, utilizing the existing infrastructure and enabling efficient data exchange with reduced bandwidth usage.
Implementation Method 1
an oscillating circuit with an induction heating coil... in order to generate an alternating magnetic field for heating the cooking vessel
Implementation Method 2
a converter, which generates a control voltage with a control frequency from an AC line voltage
Implementation Method 3
an oscillating circuit with an induction heating coil and a converter, which generates a control voltage with a control frequency
Data Source
Figure 1~2
AI summary
Described is a method for transmitting data from an induction heating device (1) to a receiver (10) of an inductively heated cooking vessel (9), wherein the induction heating device comprises: a resonant circuit (6) with an induction heating coil (3) and a converter (2) which generates a control voltage (UA) with a control frequency from a mains AC voltage (UN), wherein the resonant circuit is supplied with the control voltage to generate an alternating magnetic field for heating the cooking vessel. The data to be transmitted to the receiver is encoded using the control frequency.