Isolated Power Converter Feedback Across a Transformer Barrier
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Solution Overview
Problem
Existing isolated power converters lack efficient mechanisms for bidirectional communication and fault detection across isolated circuits, leading to suboptimal regulation of output voltage and potential operational inefficiencies.
Innovation Solution
Implementing an isolator with dedicated terminals for bidirectional communication and fault detection, utilizing controllers and decoders to transmit and decode control signals, status indications, and fault signals through a transformer-based isolation barrier, enabling precise regulation of power transfer and fault management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional isolated power converters are used without bidirectional communication mechanisms, then the device complexity is reduced, but the output voltage regulation precision deteriorates
Solution Approach 1:
The patent makes the isolation barrier serve dual functions: power transmission and bidirectional communication. The transformer not only transfers power from primary to secondary side but also carries communication signals in both directions, eliminating the need for separate communication channels and reducing overall device complexity while improving regulation precision
Solution Approach 2:
The patent introduces modulation and demodulation circuits as intermediaries to enable communication through the isolation barrier. These circuits modulate communication signals onto power transmission signals for forward communication and demodulate feedback signals on the secondary side, allowing precise voltage regulation without direct electrical connection
2Reliability
If no fault detection mechanism is implemented across the isolation barrier, then the device complexity is reduced, but the operational reliability deteriorates
Solution Approach 1:
The patent implements feedback communication from the secondary side to the primary side through the isolation barrier. The secondary side controller detects faults and operational status, communicates this information back to the primary side controller through the bidirectional communication channel, enabling real-time fault detection and improved operational reliability
Solution Approach 2:
The bidirectional communication channel acts as an intermediary for fault detection. It carries both control signals from primary to secondary side and feedback signals from secondary to primary side, allowing the system to detect faults across the isolation barrier without requiring direct electrical connection between the sides
3Stability of the object's composition
If unidirectional communication is used from secondary to primary side only, then the device complexity is reduced, but the operational stability deteriorates
Solution Approach 1:
The patent enables the isolation barrier to perform both power transmission and bidirectional communication functions simultaneously. The transformer carries both power signals and communication signals in both directions, providing the feedback mechanisms necessary for stable operation while avoiding the need for separate dedicated communication channels
Solution Approach 2:
The bidirectional communication enables feedback from the secondary side to the primary side, allowing the primary controller to adjust power transmission based on secondary side conditions. This feedback loop is essential for maintaining operational stability in isolated power converter systems
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
Enables efficient and precise regulation of output voltage by bidirectional communication and fault detection, enhancing operational stability and reliability of isolated power converters.
Implementation Method 1
An isolated power converter includes an isolation barrier, e.g., a transformer, between a first circuit (also referred to as the 'primary side circuit') and a second circuit (also referred to as the 'secondary side circuit')
Data Source
AI summary
A power converter includes an isolator having a first terminal, a second terminal, a third terminal, and a fourth terminal. A first circuit has a first terminal coupled to the first terminal of the isolator and has a second terminal coupled to the second terminal of the isolator. A second circuit has a first terminal coupled to the third terminal of the isolator and has a second terminal coupled to the fourth terminal of the isolator. The second circuit includes a controller configured to transmit a control signal through the isolator to the first circuit. The control signal includes a first indication to turn on power transmission through the isolator from the first circuit to the second circuit, a second indication of a status, and a third indication to turn off power transmission.