Three-Level Converter On-Time Control for Low Output Ripple
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Solution Overview
Problem
Modern computer systems face challenges in maintaining a stable power supply voltage due to variations in input power supply levels, leading to undesired voltage excursions or ripple, which can affect the performance of load circuits.
Innovation Solution
A power converter circuit with a switch circuit and control circuit is designed to adjust the duration of switching periods based on input and regulated power supply voltage levels, inductor value, and other parameters, ensuring a constant charge on the capacitor to reduce voltage ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed switching sequence is used in the power converter circuit, then the control logic is simple, but voltage ripple and excursions occur due to variations in input power supply levels
Solution Approach 1:
The patent implements dynamic adjustment of the switching sequence duration based on feedback from voltage sensing circuits. The control circuit modifies the duration of switching sequences in real-time according to the actual voltage levels at input and output nodes, allowing the system to adapt to varying load conditions and maintain stable output voltage without excessive complexity
Solution Approach 2:
The patent incorporates voltage sensing circuits that continuously monitor the voltage levels at input and output nodes and feed this information back to the control circuit. This feedback mechanism enables the control circuit to adjust switching sequence durations dynamically, ensuring voltage stability while maintaining relatively simple control logic
2Reliability
If the switching sequence duration is adjusted dynamically based on voltage levels, then voltage stability is improved, but the control circuit complexity increases
Solution Approach 1:
The patent divides the control function into separate modular components: voltage sensing circuits that monitor specific nodes, a control circuit that processes the sensed information, and switching circuitry that executes the control signals. This segmentation allows each component to perform its function with relatively simple design, reducing overall system complexity while maintaining voltage stability
Solution Approach 2:
The patent introduces an intermediate control circuit that acts as a mediator between the simple voltage sensing circuits and the switching circuitry. This intermediary processes the voltage level information and generates appropriate control signals, simplifying the overall control architecture by centralizing the decision-making logic in a dedicated control stage
3Loss of energy
If longer switching periods are used, then power conversion efficiency is improved, but the response time to voltage changes decreases
Solution Approach 1:
The patent dynamically adjusts the duration of switching sequences based on the actual voltage conditions and load requirements. When voltage changes are detected, the control circuit modifies the switching duration in real-time, allowing the system to maintain high efficiency during stable operation while responding quickly to voltage changes when needed
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 effectively maintains a constant inductor current pulse and reduces voltage ripple on the regulated power supply node, enhancing the stability and efficiency of power management in computer systems.
Implementation Method 1
a switch node coupled to a regulated power supply node via an inductor
Implementation Method 2
The switch circuit includes a plurality of devices, a capacitor, and a switch node
Data Source
AI summary
A power converter circuit included in a computer system may include multiple devices and a switch node coupled to a regulated power supply node via an inductor. During a first time period, the power converter charges a capacitor, and the couples the capacitor to the switch node during a second time period. During a third time period the power converter couples the switch node to an input power supply node. To maintain constant charge delivered to the load during each time the switch node is coupled to the input power supply node, the duration of the third time period is adjusted based on a voltage level of the input power supply node, a voltage level of the regulated power supply node, a value of the inductor, and the durations of first and second time periods.