Insulation DC/DC Converter Synchronization via Communication Transformer
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Solution Overview
Problem
In insulation-type DC/DC converters, there is a lack of bidirectional communication between the primary and secondary circuits, leading to potential simultaneous activation of transistors during synchronous rectification, which can cause system damage and prolong the time to safely inactivate the converter.
Innovation Solution
The implementation of a communication transformer for bi-directional communication between the primary and secondary control portions, allowing for the exchange of signals to control switch transistors and synchronous rectification transistors, enabling safe and reliable operation by preventing simultaneous activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unidirectional feedback signal transmission using optocoupler is used, then secondary-side voltage stabilization is achieved, but bidirectional communication between primary and secondary circuits is lost
Solution Approach 1:
The patent introduces a communication transformer as an intermediary device between the primary and secondary circuits. This transformer enables bidirectional signal transmission while maintaining electrical isolation, allowing both circuits to exchange information without direct electrical connection. The communication transformer resolves the contradiction by providing a new communication pathway that preserves voltage stabilization while adding bidirectional capability.
Solution Approach 2:
The communication transformer serves multiple functions: it provides bidirectional communication, maintains electrical isolation, and enables coordination between primary and secondary circuits. By making the communication system multi-functional, the patent simultaneously achieves voltage stabilization and bidirectional information exchange, resolving the trade-off between reliability and information loss.
2Use of energy by moving object
If synchronous rectification is performed with primary-side control, then rectification efficiency is improved, but risk of simultaneous transistor activation increases
Solution Approach 1:
The patent implements a feedback mechanism where the secondary-side control portion monitors the state of the synchronous rectification transistor and communicates this information back to the primary-side control portion through the communication transformer. This feedback loop allows the primary side to adjust its switching signals to prevent simultaneous activation of transistors, thereby maintaining high rectification efficiency while ensuring operational safety.
Solution Approach 2:
The communication transformer enables the secondary-side control portion to send preliminary signals to the primary side before the switching events occur. This preliminary action allows the primary-side control to anticipate and prevent potential simultaneous transistor activation, ensuring that the synchronous rectification operates efficiently without causing system damage.
3Productivity
If primary-side circuit continues operation after secondary-side issues, then system availability is maintained, but damage risk increases
Solution Approach 1:
The bidirectional communication enabled by the communication transformer allows the secondary-side control portion to immediately detect issues and communicate this information to the primary-side control portion. The primary side can then respond by adjusting or shutting down operation, preventing damage while maintaining system availability through controlled operation adjustments rather than complete system failure.
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 solution enhances the safety and reliability of the converter by ensuring that switch and synchronous rectification transistors are not activated simultaneously, thereby preventing damage and reducing the time to inactivate the converter in case of issues.
Implementation Method 1
a communication transformer, implementing bi-directional communication between the primary-side control portion and the secondary-side control portion
Data Source
AI summary
The task of the present invention is to enhance safety of an insulation-type DC/DC converter.The present invention relates to an insulation-type DC/DC converter, an AC/DC converter, a power adapter and an electronic device. A switch transistor is disposed on a primary side of a transformer, and a synchronous rectification transistor is disposed on a secondary side of the transformer. A primary-side control portion performs switch-driving of the switch transistor, and a secondary-side control portion controls turn-on and turn-off of the synchronous rectification transistor. A pulse transformer portion for implementing bi-directional communication between the primary-side control portion and the secondary-side control portion is disposed between the primary side and the secondary side. For example, signals associated with turn-on and turn-off of the switch transistor are transceived between the primary-side control portion and the secondary-side control portion by a pulse transformer portion.