Transformer Voltage Conversion Circuit With Secondary-Side Feedback
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Solution Overview
Problem
Existing power supply conversion circuits face inefficiencies in voltage conversion due to long feedback loops and poor real-time performance, leading to reduced efficiency in adjusting output voltage to meet the demands of electric loads.
Innovation Solution
A power supply conversion circuit and method that includes a primary transformer coil, a secondary transformer coil, and a first direct-current conversion circuit, where the secondary transformer coil generates an induced current and output voltage based on an electromagnetic field, and the first direct-current conversion circuit adjusts this output voltage to a target voltage based on the demand voltage of the electric load, without relying on feedback from the primary side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate coil feedback winding is added on the primary coil side of the transformer, then the output voltage can be adjusted based on electric load requirements, but the feedback loop becomes long and real-time performance deteriorates
Solution Approach 1:
The patent extracts the feedback function from the primary side to the secondary side by using the auxiliary winding to directly sense the output voltage and feed back to the control circuit on the secondary side, eliminating the need for long-distance feedback through the transformer and removing the feedback loop delay
Solution Approach 2:
The auxiliary winding acts as an intermediary element that directly couples the secondary output voltage to the control circuit through magnetic coupling, providing a real-time feedback path without requiring electrical connection across the transformer boundary, thus achieving real-time control without long feedback loops
2Adaptability or versatility
If a resistor is disposed on the secondary coil side to divide voltage and feedback is transmitted through comparator and optocoupler, then voltage feedback signal can be transmitted to primary side, but the feedback loop becomes long and adjustment real-time performance becomes poor
Solution Approach 1:
The patent extracts the voltage sensing function from the complex feedback circuitry (resistors, comparators, optocouplers) and implements it directly on the secondary side using the auxiliary winding, eliminating multiple circuit components and simplifying the overall feedback system
Solution Approach 2:
The auxiliary winding on the secondary side enables the control circuit to self-regulate the output voltage by directly sensing the output and adjusting the switching duty cycle, without requiring external feedback components or cross-primary-secondary communication
3Adaptability or versatility
If feedback is transmitted through optocoupler and control circuit on primary side, then output voltage can be adjusted, but adjustment real-time performance deteriorates
Solution Approach 1:
The auxiliary winding serves as a magnetic intermediary that directly couples the output voltage information to the control circuit on the same side, enabling instantaneous sensing and control without the delay introduced by optocoupler-based isolation feedback
Solution Approach 2:
Instead of feeding back from primary to secondary side through isolation components, the patent inverts the approach by implementing the control circuit on the secondary side where the output is directly accessible, allowing immediate adjustment without cross-boundary feedback delays
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 improves the efficiency of power supply conversion by directly adjusting the secondary output voltage to meet the electric load's demands, eliminating the need for long feedback loops and enhancing real-time performance.
Implementation Method 1
The primary transformer coil is configured to generate, based on an initial voltage inputted to the primary transformer coil, an electromagnetic field
Implementation Method 2
The secondary transformer coil is configured to generate an induced current by virtue of the electromagnetic field, generate a secondary output voltage based on the induced current
Data Source
AI summary
The voltage conversion circuit includes a first direct-current conversion circuit connected to an electric load, a secondary transformer coil connected to the first direct-current conversion circuit, and a primary transformer coil coupled to the secondary transformer coil. The primary transformer coil is configured to generate, based on an initial voltage inputted to the primary transformer coil, an electromagnetic field and couple the electromagnetic field to the secondary transformer coil. The secondary transformer coil is configured to generate an induced current by virtue of the electromagnetic field, generate a secondary output voltage based on the induced current, and transmit the secondary output voltage to the first direct-current conversion circuit. The first direct-current conversion circuit is configured to adjust, based on a predetermined demand voltage of the electric load, the secondary output voltage to obtain a target voltage.