Transformer With Switchable Secondary Windings For Duty Cycle Stability
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Solution Overview
Problem
Existing transformers face challenges in maintaining stable duty cycles when adjusting output voltage, leading to unwanted oscillations, overheating, and reduced efficiency due to duty cycle fluctuations.
Innovation Solution
A transformer design with multiple windings and switchable configurations, including a first winding, second winding, third winding, current direction control units, and switches, allows for dynamic adjustment of energy flow to maintain a stable duty cycle by turning switches on or off based on output voltage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the winding ratio remains unchanged, then the transformer structure is simple, but the duty cycle becomes unstable when output voltage varies
Solution Approach 1:
The patent applies dynamics by making the winding ratio adjustable rather than fixed. The transformer includes multiple windings on the secondary side (Tb1, Tb2, Tb3) that can be selectively connected through switches (S1, S2, S3), allowing the effective winding ratio to dynamically change based on the required output voltage, thus maintaining stable duty cycle across different operating conditions
Solution Approach 2:
The patent segments the secondary winding into multiple discrete windings (Tb1, Tb2, Tb3) that can be independently controlled. By dividing the secondary side into multiple selectable segments, the system can adjust the total number of turns on the secondary side to match different output voltage requirements, resolving the contradiction between structural simplicity and duty cycle stability
2Adaptability or versatility
If the duty cycle increases to handle higher output voltage, then the output voltage range is extended, but oscillations and overheating occur
Solution Approach 1:
The patent uses dynamic adjustment of the winding ratio to maintain optimal duty cycle across different output voltage levels. When output voltage increases, the system selectively connects additional secondary windings to increase the winding ratio, which keeps the duty cycle within the optimal range and prevents oscillations and overheating
Solution Approach 2:
The patent changes the physical parameter of winding ratio to adapt to different output voltage requirements. By altering the number of active turns on the secondary side through switch control, the system maintains appropriate duty cycle values, preventing the harmful effects of excessive duty cycle such as oscillations and thermal issues
3Measurement precision
If the duty cycle decreases to handle lower output voltage, then the output voltage precision is improved, but transformer efficiency is lowered
Solution Approach 1:
The patent dynamically adjusts the winding ratio to maintain optimal duty cycle for different output voltage levels. When output voltage decreases, the system reduces the number of active secondary windings to decrease the winding ratio, which maintains appropriate duty cycle values and preserves transformer efficiency while achieving precise voltage regulation
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
The solution effectively stabilizes the duty cycle of the PWM signal, preventing oscillations and overheating, and ensuring efficient operation across varying output voltage levels.
Implementation Method 1
A transformer may transform an alternating current (AC) or a direct current (DC) power to a DC power of a specific range
Data Source
AI summary
A transformer includes a first switch, a first winding, a second winding, a third winding, a first current direction control unit, a second current direction control unit and a loading capacitor. The first switch is coupled between the second winding and the third winding. The first winding is disposed at a primary side and coupled between an input voltage terminal and a first ground. The second winding is disposed at a secondary side and coupled between a second ground and the first switch. The third winding is disposed at the secondary side. The first current direction control unit is coupled between the second winding and an output voltage terminal. The second current direction control unit is coupled between the third winding and the output voltage terminal. The first switch is turned on for adjusting a winding ratio when the transformer is used to output a high voltage.