DC to DC Converter Bus Voltage Control via Anticipatory Adjustment
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Solution Overview
Problem
DC to DC converters face challenges in dynamically regulating output voltage during rapid transient load changes, which can cause bus voltage to exceed rated limits, leading to inefficiencies and potential system instability.
Innovation Solution
A system comprising a DC to DC converter, a capacitor, and a controller that anticipates load changes by dynamically adjusting the output voltage and using the capacitor to absorb or supply energy, maintaining the bus voltage within rated limits during step changes greater than 85% of the rated output, occurring in less than 5 milliseconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the DC to DC converter uses switching techniques to convert DC input voltage to different DC output voltage, then the voltage conversion efficiency is improved, but the bus voltage regulation stability deteriorates during rapid transient load changes
Solution Approach 1:
The controller anticipates load changes by receiving an indication of an anticipated load event and adjusts the output voltage proactively before the actual load change occurs. This preliminary voltage adjustment prepares the system to handle the transient load event, preventing bus voltage from exceeding rated limits during the rapid change.
Solution Approach 2:
The capacitor is used as an intermediary energy storage element to smooth out voltage fluctuations during transient load events. The capacitor absorbs or supplies energy rapidly in response to load changes, acting as a buffer between the DC to DC converter and the load, thereby maintaining bus voltage within rated limits.
2Reliability
If the DC to DC converter dynamically adjusts output voltage during transient load events, then the bus voltage regulation is improved, but the response time requirement becomes more stringent
Solution Approach 1:
The controller receives an indication of an anticipated load event in advance and adjusts the output voltage before the actual load change occurs. This proactive approach eliminates the need for rapid response after the load event, as the system is already prepared. The voltage adjustment is performed during the anticipation period, ensuring bus voltage remains within limits without requiring ultra-fast response time.
Solution Approach 2:
The capacitor serves as a time-delay intermediary by storing energy during normal operation and rapidly releasing or absorbing energy during transient load events. This energy buffering capability provides the necessary response time margin, allowing the controller to adjust voltage more gradually while the capacitor handles the immediate transient demands.
3Stability of the object's composition
If the DC to DC converter maintains bus voltage within rated limits during rapid transient load changes, then the system stability is improved, but the voltage conversion flexibility is reduced
Solution Approach 1:
The controller adjusts the output voltage in advance based on anticipated load events, preparing the system for specific transient conditions. This preliminary adjustment maintains system stability during known transient events while allowing the converter to operate at optimal voltage levels for different load conditions, preserving voltage conversion flexibility for non-transient operations.
Solution Approach 2:
The capacitor acts as an intermediary that decouples the voltage regulation requirement from the converter's operating flexibility. During transient events, the capacitor absorbs or supplies energy to maintain voltage within limits, while the converter can operate at different voltage levels optimized for various load conditions. The capacitor handles the transient voltage stabilization, allowing the converter to maintain flexibility in voltage conversion.
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 system effectively regulates bus voltage during transient load events, ensuring it remains within the minimum and maximum rated limits, enhancing stability and efficiency by anticipating and preparing for load changes through strategic voltage adjustments and energy management.
Implementation Method 1
a capacitor coupled in parallel across an output of the DC to DC converter
Data Source
AI summary
A system includes a DC to DC converter coupled with a load, a power source bus coupled with an input of the DC to DC converter, a capacitor coupled in parallel across an output of the DC to DC converter and a controller. The controller may dynamically adjust a bus voltage set point of a bus voltage on the output of the DC to DC converter up or down to prepare for supply of the bus voltage and energy stored in the capacitor to an anticipated load event. The load event may have a load step change that occurs in less than five milliseconds and is greater than about eighty or eighty-five percent of a rated output of the DC to DC converter.