Inductive Vehicle Charging Feedback for Secondary-Side Overvoltage
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Solution Overview
Problem
Inductive charging systems for electric vehicles face inefficiencies due to energy transmission losses and potential overvoltage issues, particularly during load shedding, which can damage components and violate electromagnetic emission standards.
Innovation Solution
A secondary circuit device with a clamper circuit unit and a primary circuit device equipped with a detection unit to manage overvoltage by influencing the magnetic field, allowing for quick energy shut-off and protective measures like detuning or short-circuiting, utilizing a physical feedback channel for rapid response without relying on complex communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inductive charging is used for contactless energy transmission, then convenience and safety are improved, but energy transmission losses increase and electromagnetic emission compliance becomes difficult to maintain
Solution Approach 1:
The patent implements a feedback mechanism where the secondary circuit device sends status information back to the primary circuit device through the magnetic field. This allows the primary side to adjust energy transmission in real-time, optimizing efficiency and reducing losses while maintaining contactless operation convenience.
Solution Approach 2:
The system dynamically adjusts transmission parameters such as frequency and power level based on coupling quality and load conditions. By changing these parameters in real-time, the system maintains high efficiency and reduces energy losses while preserving the convenience of contactless charging.
2Productivity
If high power transmission is used to improve charging speed, then productivity increases, but overvoltage issues during load shedding increase and component safety deteriorates
Solution Approach 1:
The secondary circuit device continuously monitors its own status and prepares protective measures in advance. When load shedding is detected or anticipated, the system has already positioned itself to rapidly respond, preventing overvoltage damage before it occurs while maintaining high charging speeds during normal operation.
Solution Approach 2:
The patent implements preliminary protective actions by detecting load conditions and pre-adjusting circuit parameters to prevent overvoltage. This anti-action is taken before the harmful overvoltage condition can develop, protecting components while allowing high-power transmission for fast charging.
3Measurement precision
If complex communication systems are used to manage energy transmission, then control precision improves, but device complexity increases
Solution Approach 1:
The magnetic field itself serves as an intermediary for communication between primary and secondary circuits. Status information and control signals are transmitted through modulations of the magnetic field, eliminating the need for separate complex communication hardware while maintaining precise control of energy transmission.
Solution Approach 2:
The magnetic field performs multiple functions simultaneously: it transmits energy, carries control signals, and provides feedback information. This multi-functionality reduces overall system complexity while maintaining precise control, as the same physical field handles both power and communication tasks.
4Loss of energy
If magnetic field strength is increased to improve energy transmission efficiency, then energy transmission losses decrease, but electromagnetic emission violations increase
Solution Approach 1:
The system dynamically adjusts magnetic field strength based on real-time coupling conditions and proximity detection. When coupling is strong and efficient, higher field strengths are used to minimize losses. When coupling degrades or standards thresholds are approached, the field strength is reduced, maintaining efficiency while ensuring compliance with electromagnetic emission standards.
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 effectively reduces energy transmission losses, prevents overvoltage damage, and ensures compliance with electromagnetic emission standards by enabling rapid and reliable shut-off of energy supply during load shedding, enhancing the safety and efficiency of inductive charging.
Implementation Method 1
a secondary coil for transmitting and/or receiving magnetic energy of a magnetic field and for converting the magnetic energy into electrical energy
Implementation Method 2
A magnetic alternating field in a frequency range of from 25 kHz to 150 kHz is generated in such a system
Data Source
AI summary
A secondary circuit device including a secondary coil for transmitting and/or receiving magnetic energy of a magnetic field and converting the magnetic energy into electrical energy, a transmission unit for transmitting the electrical energy, a detection unit, and a clamper circuit, wherein the magnetic field is generated by a primary coil of a primary circuit device; the transmission unit has an inlet for connecting the secondary coil; the transmission unit has an outlet for providing the electrical energy as voltage and/or current; the detection unit is connected to the inlet and/or the outlet of the energy transmission unit, in order to detect an overvoltage at the inlet and/or the outlet; and, when the overvoltage is detected, the detection unit is configured to influence the magnetic field in the secondary coil via the clamper circuit such that a current jump and/or a voltage jump is brought about in the primary coil.