Contactless EV Charger Field Strength Control
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Solution Overview
Problem
Existing contactless motor vehicle-charging devices face challenges in achieving robust and efficient energy transfer control, particularly when dealing with varying secondary sides, due to limitations in control dynamics and interoperability caused by reliance on battery current and voltage as control variables.
Innovation Solution
Incorporating a field controller and field measurement device that utilize the magnetic or electric field strength as a control variable, allowing for dynamic and robust control of energy transfer between primary and secondary sides via inductive or capacitive coupling, independent of the primary side's design, and enabling precise adjustment of field strength using voltage or current changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If battery current and voltage are used as control variables, then the control system is simple to implement, but the control dynamics and robustness deteriorate when dealing with varying secondary sides
Solution Approach 1:
The patent changes the control parameter from battery current/voltage to magnetic field strength. This parameter change enables direct control of the inductive coupling process, improving control dynamics and robustness against variations in secondary side configurations while maintaining system simplicity through direct field measurement and control.
Solution Approach 2:
The patent implements feedback control by continuously measuring the magnetic field strength between primary and secondary sides and adjusting the transmission parameters accordingly. This feedback mechanism enhances control robustness by compensating for variations in coupling conditions, air gap changes, and secondary side variations in real-time.
2Ease of operation
If traditional control methods are used, then the system is easier to operate, but the interoperability with different secondary sides deteriorates
Solution Approach 1:
The patent implements a universal control approach based on magnetic field strength measurement that can adapt to different secondary side configurations. By controlling the magnetic field directly rather than relying on battery parameters, the system achieves interoperability with various secondary sides while maintaining ease of operation through automated field-based control.
Solution Approach 2:
The patent introduces dynamic control by continuously measuring and adjusting the magnetic field strength based on real-time coupling conditions. This dynamic adaptation enables the system to maintain optimal performance across different secondary sides and operating conditions without requiring complex manual configuration.
3Productivity
If field strength control is implemented, then control dynamics and efficiency are improved, but the device complexity increases
Solution Approach 1:
The patent introduces a magnetic field measurement device as an intermediary between the primary and secondary sides. This intermediary enables direct measurement and control of the coupling field strength, improving charging efficiency through optimized energy transfer while adding only minimal circuit complexity through the measurement and control device.
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 approach enhances control dynamics and efficiency, allowing for stable and rapid energy transfer even with different primary and secondary side configurations, reducing complexity and enabling shorter charging times while maintaining robustness and interoperability.
Implementation Method 1
via an air gap, energy can be transferred by inductive or capacitive coupling
Implementation Method 2
via an air gap, energy can be transferred by inductive or capacitive coupling
Implementation Method 3
the field measurement device is a device for measuring a magnetic field or an electric field
Implementation Method 4
the field measurement device is a device for measuring a magnetic field or an electric field
Data Source
AI summary
A contactless motor vehicle-charging device which, as components, includes a primary side and a secondary side, between which, via at least one air gap, energy can be transferred via inductive and/or capacitive coupling, and each of the components in each case includes at least a portion of a control circuit of the contactless motor vehicle-charging device, wherein at least one of the components includes a field controller and at least one of the components comprises a field measurement device which is designed to acquire a magnetic and/or electric field strength, wherein the field controller is designed to use in at least one control operation the acquired field strength as an actual value and, by this actual value and a predetermined setpoint value, to set at least one field strength of the contactless motor vehicle-charging device as a control variable.