On-Chip Transformer Isolator for High-Speed Voltage Isolation
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Solution Overview
Problem
Existing digital isolators in power conversion products face challenges in providing high-speed digital links with sufficient isolation at a low cost, as they often suffer from start-up synchronization issues and error detection difficulties due to long pulse periods in magnetic pulse couplers, lack of common mode rejection in capacitive coupling, and require complex and expensive DSPs for control.
Innovation Solution
An integrated circuit with an RF isolation circuit that uses frequency or amplitude modulation to transmit data across a transformer-based isolation link, providing voltage isolation between chips and enabling high-speed data transfer while overcoming the limitations of traditional magnetic, resistive, and capacitive coupling methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic pulse couplers are used for digital isolation, then voltage isolation is achieved, but start-up synchronization and error detection become difficult due to long pulse periods
Solution Approach 1:
The patent applies periodic action by using continuous carrier wave modulation instead of discrete magnetic pulses. The RF carrier wave continuously modulates the isolation signal, enabling the receiver to maintain constant synchronization and detect errors through modulation envelope detection, eliminating the long pulse period problems of magnetic couplers
Solution Approach 2:
The patent replaces the magnetic field-based pulse transmission system with an RF electromagnetic wave-based modulation system. This substitution enables continuous carrier wave transmission with modulation techniques, providing superior start-up synchronization and error detection capabilities compared to traditional magnetic pulse methods
2Reliability
If capacitive coupling is used for isolation, then isolation is achieved, but common mode rejection is lost
Solution Approach 1:
The patent introduces a transformer as an intermediary element in the capacitive coupling isolation path. The transformer provides magnetic coupling that inherently rejects common mode signals while maintaining the isolation function, combining the benefits of both capacitive and magnetic coupling methods
3Reliability
If traditional isolation methods are used, then voltage isolation is provided, but device complexity and cost increase due to required DSPs
Solution Approach 1:
The patent enables the isolation system to self-synchronize using the continuous RF carrier wave. The receiver automatically locks onto the carrier frequency and recovers the data signal through envelope detection, eliminating the need for complex external DSP synchronization circuits and reducing overall system complexity
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 RF isolation circuit achieves voltage isolation of up to 5,000 volts, facilitating high-speed data transfer with improved start-up synchronization and error detection, reducing the need for complex DSPs and lowering costs by integrating the isolation link onto the chips.
Implementation Method 1
The RF isolation circuit uses frequency or amplitude modulation to transmit data across a transformer-based isolation link
Data Source
AI summary
An integrated circuit having voltage isolation capabilities includes a first area of the integrated circuit containing functional circuitry that is located in the substrate of the integrated circuit. A second area of the integrated circuit contains an integrated RF isolation circuitry for voltage isolating the functional circuitry. The RF isolation circuitry is located in the metal layers of the integrated circuit.