Resonant Transformer Power Supply for Stable Notebook Output
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Solution Overview
Problem
Power supply devices in notebook computers often suffer from insufficient output stability, which degrades the overall operational performance of the devices.
Innovation Solution
A power supply device incorporating a voltage divider circuit, full bridge rectifier, transformers with magnetizing and leakage inductors, switch elements, and a detection and control circuit to stabilize output voltage by storing input energy in magnetizing inductors and a resonant capacitor, using control voltages to manage energy flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power supply circuit design is used, then device simplicity is maintained, but output stability is insufficient
Solution Approach 1:
The power supply device is divided into multiple functional modules: voltage divider circuit, full bridge rectifier, resonant circuit (with resonant capacitor Cr), first transformer T1 with leakage inductor, second transformer T2, switch elements, and detection/control circuit. Each module performs a specific function, allowing the complex power supply system to achieve high output stability through coordinated operation of segmented components while managing overall complexity through functional specialization.
2Reliability
If energy is stored in magnetizing inductors and resonant capacitor, then output stability is improved, but energy loss increases
Solution Approach 1:
The power supply device employs periodic switching of the switch elements (Q1-Q4) to charge and discharge the magnetizing inductors (Lm1, Lm2) and resonant capacitor (Cr) in controlled cycles. This periodic energy storage and release mechanism, synchronized with the AC input cycle, ensures stable DC output voltage while minimizing energy losses through efficient timing and reduced parasitic effects.
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
Significantly improves output stability by preventing non-ideal oscillations, ensuring stable operation and enhanced performance of the power supply device.
Implementation Method 1
storing input energy in magnetizing inductors and a resonant capacitor
Implementation Method 2
The resonant capacitor provides a capacitive voltage
Implementation Method 3
The first transformer includes a first main coil and a first secondary coil... The second transformer includes a second main coil and a second secondary coil
Data Source
AI summary
A power supply device with high output stability includes a voltage divider circuit, a full bridge rectifier, a resonant capacitor, a first transformer, a second transformer, a first switch element, a second switch element, a third switch element, an output stage circuit, and a detection and control circuit. The first switch element selectively couples the second transformer to the first transformer. The second switch element selectively couples the output stage circuit to the first transformer. The third switch element selectively couples the output stage circuit to the second transformer. The detection and control circuit appropriately controls the first switch element, the second switch element, and the third switch element according to a divided voltage from the voltage divider circuit and a capacitive voltage from the resonant capacitor.