Secondary Charging Circuit with Fast Overvoltage Limiting
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Solution Overview
Problem
Inductive charging systems face disruptions due to loss of load on the secondary side, which can lead to overvoltage and potential component destruction, and existing communication systems are slow to respond to faults.
Innovation Solution
A secondary circuit device with a secondary-side detection unit that detects overvoltage and influences the energy conducting unit or magnetic field to limit energy transmission, using a clamper circuit to short-circuit or detune the resonant frequency, and a primary circuit device that reacts quickly to fault signals via a physical return channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional communication systems are used to detect and respond to faults, then the system can maintain simplicity, but the response time to faults is slow
Solution Approach 1:
The patent introduces a physical return channel as an intermediary communication path between the primary and secondary circuit devices. This channel uses the existing magnetic coupling infrastructure to transmit fault detection signals, bypassing the need for complex conventional communication protocols while achieving rapid fault response
Solution Approach 2:
The system implements a feedback mechanism where the secondary circuit device detects faults (such as loss of load) and sends signals back through the physical return channel to the primary circuit device, which then responds by interrupting energy transmission. This closed-loop feedback enables fast response without complex communication systems
2Reliability
If energy transmission continues during loss of load, then the system maintains continuous operation, but overvoltage occurs and components may be destroyed
Solution Approach 1:
The system performs preliminary detection of load conditions by the secondary circuit device before overvoltage can occur. When loss of load is detected, the system takes preliminary protective action by signaling the primary device to interrupt energy transmission, preventing overvoltage and component destruction before they can happen
Solution Approach 2:
The feedback mechanism through the physical return channel enables the secondary circuit device to monitor load conditions and immediately communicate faults to the primary device, which then interrupts energy transmission to prevent overvoltage and protect components
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 system effectively prevents overvoltage and protects components by quickly interrupting energy transmission, using a physical communication channel that reacts faster than conventional communication systems, ensuring safety and reliability.
Implementation Method 1
a secondary coil (L2) for transmitting and/or receiving magnetic energy of a magnetic field (106) and for converting the magnetic energy into electrical energy
Implementation Method 2
a primary coil (L1) for converting the electrical energy into a magnetic energy
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 rectifier for rectifying the electrical energy; and a detection unit; wherein the secondary coil is connected to the rectifier via a conducting unit, the conducting unit for transmitting electrical active energy and an electrical reactive energy; the conducting unit connected to an input of the rectifier; the rectifier having an output for providing the electrical active energy as voltage and/or current; the detection unit connected to the input and/or the output of the rectifier to detect an overvoltage at the input and/or the output of the rectifier and/or an external magnetic field; and, when the overvoltage is detected, the detection unit is designed such that it influences the conducting unit and/or the magnetic field to limit the transmission of the electrical active energy.