Switching Power Supply Ripple Control via Dynamic Pulse Limiting
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Solution Overview
Problem
Switching power supplies face a trade-off between reducing power consumption and increasing output ripple voltage in middle load states, where large load currents lead to significant changes in output voltage during burst operations, resulting in increased ripple voltage.
Innovation Solution
A switching power supply design that includes a transformer with a primary winding, a switching element, a current detection unit, a feedback unit, and a control unit to determine the driving time period of the switching element by comparing the feedback voltage with a predetermined reference voltage, restricting or releasing the upper limit of the driving pulse time period to manage the switching element's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If burst operation is performed in middle load state to reduce power consumption, then power consumption is reduced, but output ripple voltage increases
Solution Approach 1:
The patent applies dynamics by making the upper limit of the driving pulse time period adjustable based on load conditions. The control unit dynamically changes the pulse width limit parameter according to whether the power supply is in light load or middle load state, allowing the system to adapt its switching characteristics to different operating conditions and thus reduce output ripple while maintaining power savings.
Solution Approach 2:
The patent changes the parameter of driving pulse time period upper limit based on load state. By detecting the load condition and相应ly adjusting the maximum pulse width allowed during burst operation, the system optimizes the balance between power consumption and output voltage stability, suppressing ripple voltage in middle load state while maintaining efficiency.
2Stability of the object's composition
If driving pulse time period is increased to maintain output voltage, then output voltage stability is improved, but instantaneous electric power increases
Solution Approach 1:
The system dynamically adjusts the driving pulse time period upper limit based on real-time load detection. In middle load state, it restricts the pulse width to a predetermined upper limit that prevents excessive instantaneous power transfer, while still maintaining adequate output voltage stability through controlled switching.
Solution Approach 2:
The control unit uses feedback from load condition detection to adjust the driving pulse parameters. By continuously monitoring the load state and相应ly modifying the upper limit of the driving pulse time period, the system maintains output voltage stability while preventing excessive instantaneous power transfer to the secondary side.
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 design effectively reduces power consumption while suppressing output ripple voltage in middle load states without increasing power consumption in light load states, maintaining stable voltage variations during load changes.
Implementation Method 1
a transformer (T1) having a primary winding (104p) on its primary side and of which the primary side is insulated from its secondary side
Implementation Method 2
a current detection unit configured to detect voltage according to current flowing to the primary side of the transformer
Data Source
AI summary
A power supply device including a transformer having a primary winding and a secondary winding, and a switching element connected to the primary winding configured to drive the switching element to output voltage from the secondary winding includes a control unit configured to drive the switching element such that the switching element is turned on and, in which, in a case where the control unit performs an intermittent drive operation which repeats a period for which the switching element is driven and a period for which the drive of the switching element is stopped, in which the control unit drives the switching element such that the switching element is turned off before the voltage according to the current flowing to the primary winding reaches the voltage output from the secondary winding in the period for which the switching element is driven.