Switching Power Supply Peak Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional switching power supply apparatuses face a decrease in power efficiency at high input voltage due to losses caused by the switching operation of the switching element, which increase with current and voltage, leading to inefficiencies.
Innovation Solution
A switching power supply apparatus with a switching element, an input and output converting unit, an output voltage feedback unit, a switch current detecting unit, an oscillating frequency setting unit, and a peak current setting unit that controls the switching operation to maintain a constant switch current peak regardless of output power changes and increase it with input voltage, thereby reducing switching frequency and losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the switching element operates at high input voltage, then the power supply can handle higher voltage inputs, but the switching operation losses increase due to higher voltage and current, reducing power efficiency
Solution Approach 1:
The patent applies dynamics by making the switching frequency variable rather than fixed. The control unit adjusts the switching frequency based on detected output voltage and current conditions, allowing the system to operate at lower frequencies when conditions permit, thereby reducing switching losses while maintaining the ability to handle high input voltages
Solution Approach 2:
The patent changes the parameter of switching frequency dynamically based on operating conditions. By detecting output voltage and current, the control unit modifies the switching frequency parameter to optimize the balance between power transfer efficiency and switching loss minimization under high input voltage conditions
2Stability of the object's composition
If the switching frequency is increased to maintain output power, then the output power stability improves, but the switching operation losses increase further reducing power efficiency
Solution Approach 1:
The system dynamically adjusts switching frequency based on real-time detection of output voltage and current conditions. This dynamic control allows the system to maintain output power stability through coordinated adjustment of frequency and duty cycle, rather than relying solely on high frequency
Solution Approach 2:
The patent implements feedback control by detecting output voltage and current, comparing them with reference values, and using the error signals to adjust the switching frequency and duty cycle. This closed-loop feedback mechanism maintains output stability while optimizing for reduced switching losses
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 increases power efficiency at high input voltages by minimizing switching operation losses across the entire output power range, particularly at light loads where switching losses are significant.
Implementation Method 1
a transformer with a plurality of secondary windings
Data Source
AI summary
A switching power supply apparatus includes: an input terminal; an output terminal; a switching element; an input and output converting unit which converts input voltage applied through the switching element into output voltage to supply output power to a load; an output voltage feedback unit which outputs a feedback signal, based on the output voltage; a switch current detecting unit which detects current flowing through the switching element; an oscillating frequency setting unit which sets the switching frequency of the switching element, based on the feedback signal; a peak current setting unit which controls turn-off of the switching element by setting a current threshold such that a switch current peak (i) is constant regardless of a change in the output power and (ii) increases as the input voltage increases; and a switching control unit which controls switching operation of the switching element.