Resonant Power Supply Control for Low Switch Loss
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Solution Overview
Problem
Power supply devices in notebook computers suffer from significant non-ideal losses, which degrade overall operational performance.
Innovation Solution
A power supply device comprising a bridge rectifier, boost inductor, power switch element, output stage circuits, transformer, resonant capacitor, and detection and control circuit, which includes a microcontroller unit to adjust driving voltages based on capacitive and sense voltage differences, reducing losses in the power switch element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power supply device design is used, then basic power conversion function is achieved, but non-ideal loss is too large
Solution Approach 1:
The patent implements dynamic adjustment of the driving voltage applied to the power switch element based on real-time detection of its on-state resistance. The control circuit modifies the voltage level adaptively to match actual operating conditions, transforming a static design into a dynamic one that optimizes efficiency across varying load conditions, thereby reducing non-ideal losses without excessive complexity increase
Solution Approach 2:
The patent incorporates a feedback mechanism where the control circuit continuously detects the on-state resistance of the power switch element and uses this information to adjust the driving voltage. This closed-loop feedback system enables the power supply device to automatically optimize its operation, reducing energy losses by compensating for resistance variations while maintaining manageable circuit complexity through intelligent control
2Loss of energy
If fixed driving voltage is applied to power switch element, then circuit simplicity is maintained, but loss cannot be optimized under varying conditions
Solution Approach 1:
The patent transitions from a fixed driving voltage approach to a dynamic adjustment mechanism that adapts the voltage level based on real-time detection of the power switch element's on-state resistance. This dynamic adaptation enables the system to optimize switching losses under varying operating conditions while developing the necessary adaptive capability through intelligent control circuitry
3Loss of energy
If on-state resistance of power switch element is not compensated, then control simplicity is maintained, but non-ideal loss increases
Solution Approach 1:
The patent implements a feedback-based compensation mechanism that detects the on-state resistance of the power switch element and adjusts the driving voltage accordingly. This feedback loop enables automatic compensation for resistance variations, reducing conduction losses while keeping the control circuit complexity manageable through efficient detection and adjustment algorithms
Solution Approach 2:
The patent changes the operating parameters of the power switch element by dynamically adjusting the driving voltage based on detected on-state resistance values. This parameter adjustment strategy enables compensation for resistance changes and optimization of conduction losses without requiring fundamentally complex control circuitry, achieving better efficiency through intelligent parameter modulation
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 reduces overall loss, particularly in the power switch element, by optimizing driving conditions through dynamic voltage adjustments.
Implementation Method 1
a resonant capacitor, coupled to the magnetizing inductor, and configured to provide a capacitive voltage
Implementation Method 2
The transformer includes a main coil, a first secondary coil, and a second secondary coil. A leakage inductor and a magnetizing inductor are built in the transformer
Implementation Method 3
The output current flows through the sense resistor, such that a sense voltage difference is formed across the sense resistor
Data Source
AI summary
A power supply device with low loss includes a bridge rectifier, a boost inductor, a power switch element, a first output stage circuit, a switch circuit, a transformer, a resonant capacitor, a second output stage circuit, and a detection and control circuit. The power switch element selectively couples the boost inductor to a control node according to a first driving voltage. The resonant capacitor provides a capacitive voltage. The second output stage circuit includes a sense resistor. An output current flows through the sense resistor, such that a sense voltage difference is formed across the sense resistor. The detection and control circuit generates the first driving voltage, and determines a tunable voltage at the control node according to the capacitive voltage and the sense voltage difference.