Wireless Charging Inverter Control for Transmit Coil Current Limits
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Solution Overview
Problem
Current wireless charging systems face issues where the output current of the inverter exceeds limit values, leading to protection shutdown, as there is limited control over the decoupling of the transmit and receive ends, resulting in inefficient charging operations.
Innovation Solution
The implementation of a wireless charging system with a transmit end and a receive end that includes compensation networks and controllers to adjust the output voltage of the inverter, ensuring the actual output current remains within preset limits by dynamically controlling the current of the transmit coil, thereby preventing protection shutdown and optimizing charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output voltage of the inverter is controlled to adjust the current of the transmit coil, then the current of the transmit coil can be adjusted to meet charging requirements, but the output current of the inverter may exceed the preset upper limit value and trigger protection shutdown
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors the output current of the inverter and adjusts the output voltage accordingly. When the output current approaches the preset upper limit value, the controller reduces the output voltage to prevent overcurrent and trigger protection shutdown. This closed-loop feedback system ensures the inverter operates within safe current limits while maintaining charging efficiency.
Solution Approach 2:
The patent dynamically adjusts the output voltage of the inverter based on real-time operating conditions. The controller modifies the voltage level adaptively to meet the charging requirements of the receive end while preventing the output current from exceeding the upper limit. This dynamic control allows the system to optimize charging efficiency without triggering protection shutdown.
2Device complexity
If the control of the transmit end and receive end is decoupled to simplify control, then the control complexity is reduced, but the parameter of the inverter may exceed the limit value
Solution Approach 1:
The patent maintains decoupled control of the transmit end and receive end to simplify control complexity, while implementing feedback control at the transmit end. The controller monitors the output current and adjusts the output voltage to ensure the inverter parameter remains within limits. This feedback mechanism compensates for the lack of tight coupling between ends, preventing parameter violations without increasing control complexity.
Solution Approach 2:
The transmit end controller autonomously adjusts the inverter output voltage based on monitored current levels, without requiring complex coordinated control with the receive end. This self-service approach allows the transmit end to independently manage its own parameters within safe limits while maintaining simplified decoupled control architecture.
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 solution effectively prevents output current overlimitation, ensuring safe and efficient wireless charging operations by dynamically adjusting the transmit coil current, thus maintaining the charging requirements of the receive end without triggering protection shutdown.
Implementation Method 1
The inverter H1 is configured to convert a direct current output by a direct-current power supply into an alternating current
Implementation Method 2
The transmit coil Lp is configured to transmit the alternating current output by the inverter H1 in the form of an alternating magnetic field
Implementation Method 3
The receive coil Ls is configured to receive, in the form of an alternating magnetic field, electromagnetic energy transmitted by the transmit coil Lp
Implementation Method 4
The rectifier H2 is configured to rectify an alternating current output by the receive coil Ls into a direct current
Data Source
AI summary
A transmit end, a receive end, a method, and a system for wireless charging are provided, and are applied to the field of electric vehicles. A transmit-end controller compares an actual output current of an inverter with a preset upper limit value of an output current of the inverter and controls an output voltage of the inverter based on a comparison result to adjust a current of a transmit coil. A receive-end controller receives a sampled value of the current of the transmit coil that is sent by the transmit-end controller and updates a reference value of the current of the transmit coil when a difference between the sampled value of the current of the transmit coil and the reference value of the current of the transmit coil is greater than or equal to a preset value.