Switching Power Supply Dynamic Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply devices face challenges in maintaining high efficiency when switching between different output voltages due to inefficiencies in AC/DC and DC/DC converter configurations, which also lead to increased parts count and hinder downsizing.
Innovation Solution
A switching power supply device with a transformer having a primary winding and multiple secondary windings, synchronous rectification elements, and switch elements that allow for dynamic selection of tap connections based on output voltage settings, utilizing a control circuit to manage the on-off states of switch elements and synchronous rectification elements for optimized rectification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an AC/DC converter section and a DC/DC converter section are provided to vary output voltage largely, then the output voltage range is expanded, but the efficiency decreases and the parts count increases
Solution Approach 1:
The patent combines the AC/DC converter section and DC/DC converter section into a single integrated switching power supply device. The control circuit unifies the control of both converter sections, allowing them to operate cooperatively. This merging eliminates the efficiency loss that would occur with separate independent converter sections while maintaining the expanded output voltage range capability.
Solution Approach 2:
The switching power supply device is designed to perform multiple functions through a single integrated system. The same transformer and control circuit are used for both AC/DC conversion and DC/DC voltage adjustment, making the device universal for various output voltage requirements without needing separate dedicated converter sections for each function.
2Adaptability or versatility
If an AC/DC converter section and a DC/DC converter section are provided to vary output voltage largely, then the output voltage range is expanded, but the device size increases
Solution Approach 1:
The patent merges the AC/DC converter section and DC/DC converter section into a single integrated switching power supply device. By combining these sections and sharing common components such as the transformer and control circuit, the total parts count is reduced and the device size is minimized while still achieving expanded output voltage range.
Solution Approach 2:
The integrated switching power supply device performs multiple functions using a unified structure. The same transformer serves both AC/DC conversion and DC/DC voltage adjustment, and the control circuit manages both converter sections, thereby reducing device complexity and parts count while maintaining versatility.
3Loss of energy
If synchronous rectification method is employed to improve rectification efficiency, then the rectification efficiency is improved, but the efficiency is not optimized when output voltage is switched due to differing switching duty
Solution Approach 1:
The control circuit dynamically adjusts the operation of synchronous rectification elements based on the selected output voltage. When the output voltage switching occurs, the control circuit modifies the switching duty and timing of the synchronous rectification elements to optimize their operation for the new voltage condition, thereby maintaining high rectification efficiency across different output voltage settings.
Solution Approach 2:
The control circuit monitors the output voltage condition and uses feedback to adjust the synchronous rectification element operation. When output voltage switching occurs, the feedback mechanism allows the control circuit to detect the change and optimize the synchronous rectification timing and duty cycle accordingly, ensuring high efficiency is maintained across different voltage outputs.
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 configuration enables high efficiency across various output voltages by adjusting transformer connections and eliminates the need for additional discharge circuits, providing protection against voltage exceeding set limits during voltage changes.
Implementation Method 1
transformers as well as transformers for switching power supplies have the optimum turn ratios suitable for their output voltages according to the principle of transformers which perform output voltage conversion based on the turn ratio
Implementation Method 2
there is an idea of employing a synchronous rectification method (M1, M2) to improve the rectification efficiency of an AC/DC converter section
Data Source
AI summary
A switching power supply device that switches setting of an output voltage based on an external signal according to one or more embodiments includes: a transformer including a primary winding and n secondary windings; n synchronous rectification elements provided, corresponding to the n secondary windings; and n−1 switch elements that switch the secondary windings. Each of the n−1 switch elements is kept on or off according to a high or low voltage value out of set voltages of the output voltage, and all or any of the n synchronous rectification elements are selected to synchronously rectify pulse voltage of the secondary windings, and when operation with a high set value of the output voltage stops, a synchronous rectification element used to output the high set value performs switching operation until the output voltage goes down to the low voltage value of the set voltages of the output voltage.