Switching Power Supply Overload Recovery for Stable Output Voltage
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Solution Overview
Problem
Existing power supply systems face challenges in effectively managing overload states, particularly when temporary decreases in alternating-current voltage occur, leading to unstable output voltages and potential deterioration of components due to repeated restarts or continuous overload detection methods.
Innovation Solution
A power supply apparatus with a transformer, switching element, and control device that detects overload states and adapts its response by either maintaining a stopped state or resuming operation based on the timing of overload detection relative to the output voltage reaching a target value, employing a first control process for continuous overloads and a second process for temporary overloads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the latch protection method is selected for severe overload, then the switching operation is maintained in a stopped state to protect the power supply, but the stopped state is maintained even in cases where the decrease in alternating-current voltage is temporary, requiring the user to pull out the plug
Solution Approach 1:
The patent applies dynamics by making the protection method adaptive rather than static. The control device dynamically selects between latch protection and restart protection based on the timing of overload detection relative to when the output voltage reaches the target value. This dynamic adaptation allows the system to maintain reliability while improving ease of operation for temporary voltage decreases.
Solution Approach 2:
The patent changes the parameter of protection method selection based on the timing parameter of overload detection. By using the timing at which the overload occurs (before or after output voltage reaches target value) as the basis for selecting the protection method, the system optimizes both reliability and ease of operation under different operating conditions.
2Ease of operation
If the restart protection method is selected for slight overload, then automatic recovery can be performed in cases where the decrease in alternating-current voltage is temporary, but in cases where a slight overload state occurs continuously, the operation of recovering automatically and stopping the switching is repeated, causing output voltage to become unstable
Solution Approach 1:
The patent changes the protection method based on the timing parameter of overload detection. When overload is detected before the output voltage reaches the target value, latch protection is applied; when detected after, restart protection is applied. This parameter-based selection resolves the contradiction by adapting the protection strategy to the specific operational stage.
Solution Approach 2:
The patent uses feedback from the overload detection timing relative to the output voltage reaching the target value to determine the appropriate protection method. This feedback mechanism allows the system to distinguish between temporary and continuous overload conditions, maintaining both automatic recovery capability and output voltage stability.
3Ease of operation
If the restart protection method is used continuously, then automatic recovery is enabled, but repeated restart operations cause parts of the power supply apparatus to deteriorate
Solution Approach 1:
The patent changes the protection method based on the timing parameter of overload detection to balance automatic recovery with component durability. By applying latch protection for overloads occurring before output voltage reaches the target value and restart protection for overloads occurring after, the system reduces unnecessary repeated restart operations and their associated component stress.
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 provides appropriate protection by stabilizing output voltage and preventing component deterioration, ensuring reliable operation by distinguishing between continuous and temporary overload conditions.
Implementation Method 1
a transformer including a primary winding, the secondary winding, and an auxiliary winding
Implementation Method 2
a switching element connected to the primary winding and configured to perform a switching operation
Data Source
AI summary
A switching control device, in a case where the overload state is detected after the switching operation is started and before the output voltage reaches a target voltage, performs a first process of maintaining a state where the switching operation is stopped and, in a case where the overload state is detected after the output voltage reaches the target voltage, performs a second process of stopping the switching operation and, after a lapse of a first time, resuming the switching operation.