Inverter Frequency Modulation for Inductive Power Control
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Solution Overview
Problem
Existing circuits for generating electromagnetic fields for inductive energy transmission are cumbersome and costly, with limited ability to precisely adjust transmitted power without increasing installation space or using additional DC-DC converters.
Innovation Solution
A circuit that uses an inverter with a control device to generate AC voltage by superimposing an additional clock frequency on a base frequency, allowing for precise adjustment of power transmission through modulation of the duty cycle, eliminating the need for DC-DC converters and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DC-DC converters are used to adjust input voltage for power control, then power adjustment capability is improved, but device complexity and installation space increase
Solution Approach 1:
The patent changes the operating frequency parameter of the inverter as the primary means to control power transmission. By varying the frequency at which the inverter switches between its switching elements, the output power is directly controlled without requiring additional voltage conversion stages. This frequency-based control replaces the traditional voltage-based DC-DC conversion approach, simplifying the overall circuit architecture while maintaining precise power adjustment capability.
2Measurement precision
If additional components are added for precise power adjustment, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where the control device monitors the actual power transmission level and adjusts the inverter's switching frequency accordingly. This closed-loop feedback system enables precise power adjustment by continuously comparing the desired power level with the actual output and making real-time frequency corrections, achieving high precision without adding complex power sensing and conversion hardware.
3Ease of operation
If inverter switching frequency is varied for power control, then power adjustment is simplified, but electromagnetic interference increases
Solution Approach 1:
The patent employs periodic switching action with carefully selected frequency ranges and modulation patterns. By using controlled periodic switching at optimized frequencies, the system achieves simple frequency-based power control while minimizing electromagnetic radiation and interference. The periodic nature of the switching allows for predictable electromagnetic behavior that can be managed through proper filtering and shielding design.
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 reliable and precise adjustment of transmitted power while minimizing installation space and production costs, reducing unwanted interference and simplifying circuitry.
Implementation Method 1
The inverter is operated at a first clock frequency in order to provide the AC voltage... the coil structure for generating the electromagnetic field upon being charged with the output voltage
Implementation Method 2
The generation of an electromagnetic field for inductive energy transmission normally takes place by means of at least one coil structure (primary coil structure) which is charged with an AC voltage
Implementation Method 3
The electromagnetic field generated in this way is received by means of a further coil structure (secondary coil structure) which may be part of the end device, for example, and induces a voltage
Data Source
AI summary
The invention relates to a method for operating a circuit for generating an electromagnetic field for inductive energy transmission, wherein an inverter for providing an AC voltage is operated at a first clock frequency, wherein operation at an additional clock frequency is superimposed on the operation at the first clock frequency; and a circuit.