Adaptive Power Voltage Generator for Lower Switching Loss
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Solution Overview
Problem
Display devices experience increased switching loss due to high switching frequency of power and driving voltages, which is not effectively managed by existing power voltage generators.
Innovation Solution
A power voltage generator that includes an input voltage providing part, an inductor, an outputting part, an output sensing part, a peak voltage generator, and a switch controller, which dynamically adjusts switch control signals based on sensed voltages and feedback to vary the output voltage and reduce switching frequency by increasing ripple set voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the switching frequency of the power voltage and driving voltage is increased, then the power supply efficiency is improved, but the switching loss increases
Solution Approach 1:
The power voltage generator dynamically adjusts the switching frequency based on the output voltage requirements. The switch controller varies the switching frequency of the power voltage and driving voltage according to the detected output voltage level, allowing the system to operate at lower switching frequencies when high efficiency is needed while maintaining the ability to increase frequency when faster response is required. This dynamic adjustment resolves the contradiction by making switching frequency adaptive rather than fixed.
Solution Approach 2:
The invention changes the switching frequency parameter dynamically based on output voltage conditions. By detecting the output voltage and adjusting the switching frequency accordingly, the system optimizes the balance between power supply efficiency and switching loss. The switch controller modifies the frequency parameter in real-time, enabling the system to achieve high efficiency at appropriate operating points while maintaining responsiveness when needed.
2Speed
If the switching frequency is increased to improve response speed, then the response time is reduced, but the switching loss increases
Solution Approach 1:
The system dynamically adjusts switching frequency based on actual output voltage requirements rather than operating at a constantly high frequency. The switch controller monitors output voltage and varies the switching frequency accordingly, enabling fast response when voltage adjustment is needed while minimizing switching loss during steady-state operation. This dynamic behavior allows the system to achieve rapid response on demand without continuously incurring high switching losses.
Solution Approach 2:
The power voltage generator uses periodic switching actions with variable periods (frequencies). By adjusting the period of switching based on output voltage conditions, the system can implement rapid corrections when needed (shorter periods/higher frequency) while using longer periods (lower frequency) during stable operation. This periodic action with variable timing allows the system to maintain response capability while reducing average switching loss.
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 reduces switching loss by decreasing the switching frequency of the output voltage, thereby improving the efficiency of the power voltage generator in display devices.
Implementation Method 1
an inductor configured to receive the input voltage to generate an inductor current
Data Source
AI summary
A power voltage generator includes: an input voltage providing part outputting input voltage based on a first signal; an inductor receiving the input voltage to generate an inductor current and connected to an outputting part; the outputting part generating an output voltage based on the inductor current and generating a feedback voltage; an output sensing part sensing the output voltage based on a second signal and generating an output sensing voltage; a peak voltage generator generating a peak voltage based on the input voltage, set data corresponding to an output set voltage, and ripple data corresponding to a ripple set voltage; a first comparing part generating a stop signal based on the output sensing and peak voltages; a second comparing part generating a start signal based on the set data and feedback voltage; and a switch controller generating the first and second signals based on the start and stop signals.