Power Supply Voltage Switching Control
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Solution Overview
Problem
Active-clamp switching power supplies face issues with overshoot or undershoot in output voltage switching, leading to unnecessary current flowing into components due to inability to perform zero-voltage switching.
Innovation Solution
A power supply apparatus with a transformer, switching elements, and a control unit that adjusts output voltage by using a feedback mechanism and notification system to switch the target voltage smoothly, ensuring zero-voltage switching and reducing unnecessary current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the output voltage of the switching power supply is sharply changed to improve efficiency under light load, then the power conversion efficiency is improved, but overshoot or undershoot occurs and unnecessary current flows into components due to inability to perform zero-voltage switching
Solution Approach 1:
The control unit performs preliminary action by detecting the current output voltage level and preparing the appropriate target voltage (first target voltage or second target voltage) before switching occurs. This preliminary detection and preparation ensures that the voltage transition is planned and controlled, preventing sharp changes that would cause overshoot/undershoot while maintaining efficiency improvements.
Solution Approach 2:
The invention changes the output voltage parameter from a single fixed value to two selectable target voltages (first target voltage and second target voltage). The control unit dynamically selects which target voltage to apply based on detection results, allowing the system to optimize between efficiency and zero-voltage switching capability by adjusting the voltage parameter appropriately.
2Use of energy by moving object
If the output voltage is reduced under light load to improve efficiency, then power consumption is reduced, but voltage instability and component stress increase
Solution Approach 1:
The system dynamically adjusts the output voltage between two target levels based on operational conditions detected by the control unit. Rather than using a single static voltage or abrupt changes, the system transitions smoothly between first and second target voltages, maintaining voltage stability while adapting power consumption to load conditions.
Solution Approach 2:
The control unit detects the current output voltage level and uses this feedback information to determine which target voltage to switch to. This feedback mechanism ensures stable transitions between voltage levels by making switching decisions based on actual system state, preventing voltage instability while achieving power consumption optimization.
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 unnecessary current flowing into components during output voltage switching, maintaining zero-voltage switching and extending component lifespan while improving power conversion efficiency.
Implementation Method 1
a transformer including a primary winding and a secondary winding
Implementation Method 2
a rectifying and smoothing unit configured to rectify and smooth a voltage induced in the secondary winding
Implementation Method 3
a circuit including a second switching element and a capacitor connected in series with each other
Data Source
AI summary
The power supply apparatus includes a notification unit configured to notify, according to an input first signal, a control unit that a target voltage is switched from a first voltage to a second voltage higher than the first voltage; and a switching unit configured to switch the target voltage to the first voltage or the second voltage. The switching unit switches the target voltage from the first voltage to the second voltage after the notification unit notifies the control unit that the target voltage is switched from the first voltage to the second voltage.