DC-DC Converter Switching Frequency Synchronization for Display Ripple Reduction
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Solution Overview
Problem
Display devices malfunction due to excessive ripple frequency in the output voltage from their power supplies, leading to distorted images.
Innovation Solution
A power supply system that includes a DC-DC converter with a switching controller, which synchronizes the switching frequency with the load current frequency to minimize ripple frequency, using a current sensor to detect the load current and adjust the switching frequency accordingly, ensuring the switching control signal aligns with the load current's frequency or a multiple thereof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional DC-DC converter is used with fixed switching frequency, then the power supply can operate continuously, but the output voltage exhibits excessive ripple frequency causing display device malfunction
Solution Approach 1:
The patent applies dynamics by making the switching frequency adjustable rather than fixed. The switching controller dynamically changes the switching frequency of the DC-DC converter based on the detected load current frequency, allowing the system to adapt to varying load conditions and minimize output voltage ripple that causes display malfunctions
Solution Approach 2:
The patent implements feedback by using a current sensor to detect the load current frequency and feeding this information back to the switching controller. The controller then adjusts the switching frequency accordingly, creating a closed-loop system that continuously optimizes the output voltage quality by minimizing ripple frequency
2Object-generated harmful factors
If the switching frequency is synchronized with load current frequency, then the ripple frequency is minimized, but the system complexity increases due to additional sensing and control mechanisms
Solution Approach 1:
The switching controller performs multiple functions: it not only controls the switching elements but also detects load current frequency (through the current sensor) and adjusts switching frequency accordingly. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in system complexity while achieving ripple minimization
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 effectively reduces the ripple frequency of the output voltage, preventing display device malfunctions and ensuring stable image display by synchronizing the switching frequency with the load current, thereby minimizing distortion.
Implementation Method 1
a direct current to direct current ('DC-DC') converter that includes at least one switching element and that converts an externally supplied input voltage to an output voltage
Implementation Method 2
a current sensor that detects a frequency of a load current by sensing the load current
Data Source
AI summary
A power supply includes a direct current to direct current converter that includes at least one switching element and that converts an externally supplied input voltage to an output voltage and then supplies the output voltage to a load, a current sensor that detects a frequency of a load current by sensing the load current, and a switching controller that sets a switching frequency corresponding to the frequency of the load current and that controls an operation of the at least one switching element according to the set switching frequency.