Boost Converter Dynamic Voltage Control Reduces Bulk Capacitance
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Solution Overview
Problem
Conventional power supply systems require large bulk capacitors, occupying significant space and limiting the miniaturization of adapters, as they need to operate with a wide input voltage range and maintain a stable DC voltage for various electronic devices.
Innovation Solution
The implementation of a power supply system with a boost converter that dynamically adjusts the voltage across the bulk capacitor by activating and disabling the converter based on predetermined voltage thresholds, reducing the need for large capacitors through PWM and always-off modes, and using a controller to manage the boost converter's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional power supply system uses a large bulk capacitor to maintain stable DC voltage across wide input voltage range, then voltage stability is improved, but the adaptor size increases significantly
Solution Approach 1:
The patent implements a dynamic voltage compensation mechanism using a boost converter that actively adjusts the bulk capacitor voltage based on rectifier output voltage variations. The controller monitors the rectifier output voltage and activates the boost converter when voltage drops below a threshold, dynamically compensating for voltage sags and maintaining stable DC bus voltage without requiring oversized capacitance.
Solution Approach 2:
The system changes the operating parameters of the bulk capacitor by using a boost converter to actively regulate its voltage. Instead of relying on fixed large capacitance to handle all voltage variations, the system dynamically adjusts the capacitor voltage through the boost converter, allowing the use of smaller capacitance while maintaining voltage stability across wide input ranges.
2Adaptability or versatility
If a power supply system operates with wide input voltage range to support universal adaptability, then adaptability is improved, but the bulk capacitance requirement increases
Solution Approach 1:
The boost converter is designed to perform multiple functions: it compensates for voltage drops during rectifier operation, extends the operating input voltage range, and reduces the bulk capacitance requirement. This multi-functional approach allows the power supply to support wide input voltage ranges (including universal 90-264V AC) without proportionally increasing bulk capacitance.
Solution Approach 2:
The controller implements feedback control by continuously monitoring the rectifier output voltage and activating the boost converter when voltage drops below a predetermined threshold. This feedback mechanism ensures stable operation across wide input voltage ranges by dynamically compensating for voltage variations, reducing the need for excessive bulk capacitance to handle all possible voltage conditions.
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 approach significantly reduces the bulk capacitance required, allowing for a smaller form factor in power supply systems while maintaining stable voltage delivery across varying input voltages, thereby enhancing integration density and adaptability.
Implementation Method 1
a boost converter coupled between the rectifier and the bulk capacitor, the boost converter increasing a voltage across the bulk capacitor
Data Source
AI summary
A method includes detecting a voltage across a bulk capacitor of a power supply system, wherein the power supply system comprises a rectifier, a boost converter and a power converter, and wherein the bulk capacitor is between the boost converter and the power converter, activating the boost converter after the voltage across the bulk capacitor decreases and reaches a first voltage threshold and disabling the boost converter after the voltage across the bulk capacitor increases and reaches a second voltage threshold, wherein the second voltage threshold is greater than the first voltage threshold.