Transformer Feedback Encoding for Power Converter Isolation
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Solution Overview
Problem
Isolated power converters face slow response times and limited information transmission due to the use of optocouplers for feedback, which are not part of the power path and restrict direct information feedback from the secondary to the primary side, impacting converter performance.
Innovation Solution
An information feedback system utilizing a power transformer as a separating device with a primary and secondary winding, coupled with a first electrical switch and a controller, encodes information within the power path to rapidly transmit commands from the secondary to the primary side, eliminating the need for additional non-power path circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optocoupler is used for information feedback, then isolation between primary and secondary sides is maintained, but response time becomes slow and information transmission capability is limited
Solution Approach 1:
The patent merges the power transmission function and information feedback function into a single channel by using the secondary winding as both the power delivery path and the feedback information path. The controller modulates the discharge characteristics of the secondary winding to encode feedback information, eliminating the need for separate optocoupler-based feedback circuitry while maintaining galvanic isolation through the transformer structure.
2Reliability
If optocoupler is used for information feedback, then isolation is maintained, but device complexity increases due to additional non-power path circuitry
Solution Approach 1:
The patent extracts the feedback information transmission function from the separate optocoupler circuit and integrates it directly into the power transmission path through the secondary winding. By controlling the discharge behavior of the secondary winding, the system encodes feedback information within the existing power delivery mechanism, removing the need for additional dedicated feedback components and simplifying the overall circuit architecture.
3Reliability
If optocoupler is used for information feedback, then isolation is maintained, but only simple information can be transmitted
Solution Approach 1:
The patent employs parameter modulation of the secondary winding discharge characteristics to encode complex feedback information. By varying parameters such as discharge timing, duration, and amplitude, the controller can transmit multiple types of information (output voltage status, current status, fault conditions) through the same isolated power transmission channel, significantly expanding the information capacity beyond simple feedback signals.
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 rapid and efficient transmission of complex information through the power path, improving control over power converters by using the transformer as both a power and feedback path, thus enhancing converter performance without additional components.
Implementation Method 1
The separating device transmits the encoded information from the secondary winding to the primary winding
Data Source
AI summary
An information feedback system is disclosed. The information feedback system comprises a separating device having the primary winding and the secondary winding, a first electrical switch and a controller. The secondary winding is coupled to an operation device through the first electrical switch. The first electrical switch and the operation device are coupled to the controller. The energy is discharged from the secondary winding to the operation device through the first electrical switch. The operation device receives the energy from the first electrical switch to generate a plurality of commands. The controller receives the commands and uses the first electrical switch to encode a plurality of signals to generate encoded information according to the commands. The separating device transmits the encoded information from the secondary winding to the primary winding.