Two-Stage Power Supply With Valley-Fill for Smaller Stable DC Output
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Solution Overview
Problem
Conventional power supply devices for electronic products are bulky and inconvenient due to their large volume, which limits their portability and usability.
Innovation Solution
A power supply device comprising a rectifier module, a first-stage conversion circuit, a second-stage conversion circuit, and a valley-fill circuit that converts alternating-current power into stable direct-current power, with the valley-fill circuit enhancing the valley voltage of the pulsating direct-current power to ensure stable output and reduce the device's volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional power supply devices are designed to provide sufficient power, then power output is improved, but device volume increases making it bulky and inconvenient
Solution Approach 1:
The power supply device is divided into two-stage conversion circuits. The first-stage conversion circuit performs initial power conversion and isolation, while the second-stage conversion circuit performs final voltage regulation. This segmentation allows each stage to be optimized independently, reducing overall device volume while maintaining sufficient power output capability.
Solution Approach 2:
The valley-fill circuit performs preliminary action by filling voltage valleys before the power reaches the conversion circuits. This pre-processing of the input voltage waveform improves conversion efficiency and allows the use of smaller magnetic components, thereby reducing device volume while maintaining power output.
2Loss of energy
If power conversion efficiency is improved, then energy loss is reduced, but device complexity increases
Solution Approach 1:
The valley-fill circuit performs preliminary action by filling voltage valleys before the power reaches the conversion circuits. This pre-processing improves conversion efficiency and allows the use of smaller magnetic components, thereby reducing device volume while maintaining power output.
Solution Approach 2:
The valley-fill circuit acts as an intermediary between the rectifier module and the conversion circuits. It conditions the rectified voltage by filling valleys and smoothing fluctuations, providing a more stable input to subsequent stages, which improves overall efficiency without requiring complex control circuits.
3Stability of the object's composition
If valley voltage of pulsating direct-current is increased, then voltage stability is improved, but additional circuit components are required
Solution Approach 1:
The valley-fill circuit is merged with the existing rectifier module and conversion circuits. It uses the auxiliary winding of the transformer in the first-stage conversion circuit to generate the valley-fill voltage, combining multiple functions into a single integrated structure rather than adding separate independent components.
Solution Approach 2:
The valley-fill circuit is self-regulating and automatically activates only when needed. It uses the inherent voltage fluctuations from the rectifier module and draws energy from the auxiliary winding during voltage valleys, without requiring external control signals or additional power sources, thereby reducing overall system complexity.
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 reduces the volume of the power supply device, enhances voltage stability, and decreases peak current requirements, thereby improving portability and efficiency while maintaining sufficient power support for electronic devices.
Implementation Method 1
a rectifier module configured to perform rectification on alternating-current power to thereby obtain a first pulsating direct-current voltage
Implementation Method 2
a first-stage conversion circuit connected to the rectifier module, in which the first-stage conversion circuit is configured to perform isolation conversion on the first pulsating direct-current voltage
Implementation Method 3
a valley-fill circuit connected to the rectifier module and the first-stage conversion circuit individually, in which the valley-fill circuit is configured to supply, in response to a voltage value of the first pulsating direct-current being less than a first voltage threshold, electrical power to an input of the first-stage conversion circuit
Implementation Method 4
a second-stage conversion circuit connected to the first-stage conversion circuit, in which the second-stage conversion circuit is configured to convert the second pulsating direct-current voltage into a stable direct-current voltage
Data Source
AI summary
A power supply device, includes a rectifier circuit configured to perform rectification on alternating-current power to obtain a first pulsating direct-current voltage, a first-stage conversion circuit connected to the rectifier circuit and configured to perform isolation conversion on the first pulsating direct-current voltage to thereby obtain a second pulsating direct-current voltage; a second-stage conversion circuit connected to the first-stage conversion circuit and configured to convert the second pulsating direct-current voltage into a stable direct-current voltage; and a valley-fill circuit connected to the rectifier circuit and the first-stage conversion circuit individually, wherein the valley-fill circuit is configured to supply, in response to a voltage value of the first pulsating direct-current being less than a first voltage threshold, electrical power to an input of the first-stage conversion circuit to thereby increase a valley voltage of the first pulsating direct-current voltage.