Transformer Feedback Encoding for Stable Switching Power Control
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Solution Overview
Problem
Existing switching power supplies face issues with low accuracy in information sampling and control due to interference, leading to unstable system operation and unreliable information transmission, particularly in primary feedback methods.
Innovation Solution
A switching power supply system that employs secondary side sampling and encoding, followed by primary side decoding and control, using a transformer to transmit information through an encoding and controlling circuit, transformer auxiliary winding, and decoding and controlling circuit to ensure reliable information transmission without affecting system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If primary feedback control method is adopted to eliminate optocoupler and error amplifier, then device complexity and cost are reduced, but measurement precision and reliability of information transmission deteriorate due to interference from component operations
Solution Approach 1:
The patent segments the feedback control into two independent sides: secondary side sampling/encoding and primary side decoding/control. This segmentation allows each side to operate independently without mutual interference, eliminating the need for optocouplers and error amplifiers while maintaining high measurement precision through dedicated sampling circuits on the secondary side.
Solution Approach 2:
The patent introduces an intermediary encoding scheme that transforms secondary side output information into encoded signals modulated on the transformer secondary winding. This encoded signal serves as an intermediary carrier that transmits information to the primary side without requiring direct electrical connection or additional isolation components, thus reducing complexity while preserving accuracy.
2Measurement precision
If transmission methods are used to transfer information from secondary side to primary side, then measurement precision is improved, but system stability and reliability deteriorate due to interference affecting stable operation
Solution Approach 1:
The patent employs periodic sampling action on the secondary side where the sampling circuit periodically captures output information at specific moments when interference is minimal. This periodic sampling, combined with encoding, ensures accurate information capture while the periodic nature synchronizes with the switching frequency to avoid interference, maintaining both precision and system stability.
Solution Approach 2:
The patent performs preliminary encoding of the sampled information before transmission to the primary side. By pre-encoding the output information into a robust format modulated on the transformer winding, the system prepares the information in advance to resist interference during transmission, ensuring both accurate reception and stable system operation without requiring additional stabilization measures.
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
Ensures reliable information transmission and stable system operation by accurately adjusting output information to meet demand, minimizing interference and improving system reliability.
Implementation Method 1
a transformer auxiliary winding, configured to obtain modulated switching voltage waveform of the transformer secondary winding by coupling
Data Source
AI summary
The present application discloses a switching power supply using a transformer for transmitting information. The switching power supply includes an encoding and controlling circuit configured for generating an encoded signal based on output information of the secondary side and demand information of an electrical equipment, and modulating the encoded signal onto a switch voltage waveform; a primary chip, configured to obtain the induced switch voltage waveform from the auxiliary winding; a decoding and controlling circuit configured for decoding the modulated switching voltage waveform; and a loop control and drive module configured to control on/off of the primary side switch tube according to decoded results to adjust the secondary side output information.