Resonant Inductor Coupling Across IC Isolation Barriers
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Solution Overview
Problem
Integrated circuits face challenges in power transfer across isolation barriers due to voltage spikes, which can damage the IC, and existing methods require larger inductors to achieve significant voltage gain, increasing cost and area.
Innovation Solution
The use of resonator circuits with inductively coupled inductors and a control module that tunes the LC tank based on isolated feedback to achieve resonance coupling, allowing power transfer across isolation barriers with smaller inductors and higher voltage gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation barriers are implemented to protect circuits from voltage spikes, then circuit safety is improved, but power transfer efficiency deteriorates due to component size requirements
Solution Approach 1:
The patent applies resonance coupling between primary and secondary resonator circuits to enable efficient power transfer across the isolation barrier. By tuning the resonant frequencies of both circuits to match, energy transfer is maximized through oscillating electromagnetic fields, avoiding the need for large transformer components that would otherwise be required for galvanic isolation.
Solution Approach 2:
The patent uses variable capacitor arrays to dynamically adjust the resonant frequency of the resonator circuits. This allows the system to maintain optimal resonance conditions and adapt to varying load conditions, ensuring efficient power transfer while maintaining circuit isolation from voltage spikes.
2Power
If larger inductors are used to achieve sufficient voltage gain across isolation barriers, then power transfer capability is improved, but device area increases
Solution Approach 1:
By operating the inductors at resonant frequencies within matched resonator circuits, the system achieves high voltage gain with much smaller inductor sizes. The resonant oscillation amplifies the voltage transformation ratio, allowing compact inductors to deliver the required power levels that would otherwise demand large magnetic components.
Solution Approach 2:
The patent employs variable capacitance elements that allow dynamic tuning of the resonant frequency. This dynamic adjustment optimizes the voltage gain at different operating conditions and load levels, enabling small inductors to maintain sufficient power transfer capability across varying scenarios without requiring oversized components designed for worst-case conditions.
3Area of stationary object
If resonance coupling is used to transfer power across isolation barriers, then component size is reduced, but system complexity increases due to tuning requirements
Solution Approach 1:
The patent incorporates feedback mechanisms where the secondary resonator circuit provides isolated feedback signals to the primary resonator circuit. This feedback enables automatic frequency locking and resonance condition maintenance, reducing the manual tuning complexity and allowing the system to self-adjust to maintain optimal operation with the variable capacitor arrays.
Solution Approach 2:
The matched resonator circuits are designed to automatically establish and maintain resonant coupling conditions through their inherent frequency-matched architecture. The system self-regulates the power transfer by exploiting the natural resonance interaction between primary and secondary circuits, minimizing the need for complex external control mechanisms while maintaining compact component sizes.
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 enables efficient power transfer with smaller inductors, achieving larger voltage gains and load power while reducing transmission loss and switching losses, and improving overall efficiency.
Implementation Method 1
The first and second inductors are inductively coupled to the third and fourth inductors, respectively, thereby providing for transfer of power from the first resonator circuit across the isolation barrier to the second resonator circuit
Implementation Method 2
Systems and methods for power transfer based on resonance coupling of inductors
Data Source
AI summary
An integrated circuit (IC) includes first and second resonator circuits and an isolation barrier. The first resonator circuit includes first and second inductors, wherein the first resonator circuit is connected to a supply voltage. The second resonator circuit includes third and fourth inductors, wherein the second resonator circuit is matched to the first resonator circuit. The isolation barrier separates the first and second resonator circuits. The first and second inductors are inductively coupled to the third and fourth inductors, respectively, thereby providing for transfer of power from the first resonator circuit across the isolation barrier to the second resonator circuit.