Resonant Transformer Switching for Stable Multi-Level Output Voltage
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Solution Overview
Problem
Current power conversion systems face challenges in stabilizing output voltage across varying loads, as they lack efficient mechanisms to adjust switching frequency and turned-on timings based on load conditions, leading to instability in power delivery.
Innovation Solution
A power conversion apparatus and control module that utilize a transformer and a control module with a timing unit, detection unit, and control unit to set a blanking time interval and count oscillation turning points of a resonance voltage, adjusting the power switch's turned-on time and frequency to stabilize output voltage across different load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power switch is turned on continuously without adjusting timing and frequency, then the power transmission capacity is maintained, but the output voltage becomes unstable under varying load conditions
Solution Approach 1:
The patent employs a feedback mechanism where the control module monitors the output voltage and load conditions, then adjusts the power switch timing and frequency accordingly. The control module counts oscillation turning points of the resonance voltage and compares it against a predetermined threshold to determine optimal switching moments, creating a closed-loop control system that maintains voltage stability under varying loads.
Solution Approach 2:
The patent implements dynamic adjustment of the power switch characteristics by varying both the turned-on time and switching frequency based on real-time load conditions. The control module dynamically modifies the blanking time interval and counts oscillation turning points to adapt the switching parameters, transforming a static switching system into a dynamic one that responds to changing operational requirements.
2Speed
If the switching frequency is increased to respond quickly to load changes, then the output voltage stabilization speed is improved, but the energy loss increases
Solution Approach 1:
The patent utilizes periodic resonance oscillations to control the power switch timing. By counting oscillation turning points of the resonance voltage and comparing against a threshold, the system synchronizes switching actions with the natural periodic behavior of the resonant circuit, achieving efficient voltage regulation while minimizing energy loss through resonant-based periodic switching.
3Measurement precision
If the blanking time interval is extended to allow complete resonance oscillation, then the switching precision is improved, but the response time to load changes increases
Solution Approach 1:
The patent applies partial action by setting a predetermined threshold for the number of oscillation turning points that does not require completing full resonance cycles. The control module counts turning points and triggers the power switch when the threshold is reached, rather than waiting for complete oscillation periods, thereby achieving sufficient switching precision without excessive blanking time 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 allows for quick stabilization of output voltage by appropriately controlling the turned-on time and switching frequency of the power switch, ensuring stable power delivery across different load conditions.
Implementation Method 1
The transformer has a primary side coupled to the power switch, and a resonance voltage generated on the primary side when the power switch is turned off
Data Source
AI summary
A power conversion apparatus supplies power to a load, and the power conversion apparatus includes a power switch, a transformer, and a control module. The control module alternately turns on and turns off a power switch of the power conversion apparatus to convert an input voltage into an output voltage through the transformer. When the power switch is turned off, a primary side of the transformer generates a resonance voltage. The control module sets a predetermined counting threshold according to the output voltage, and sets a blanking time interval according to a feedback signal related to the load. After the blanking time interval ends, the control module counts a number of an oscillation turning point generated by the resonance voltage due to the oscillation of the resonance voltage. When the number reaches the predetermined counting threshold, the control module turns on the power switch.