DC/DC Converter Input Voltage Transient Response Control
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Solution Overview
Problem
Conventional DC/DC full bridge converters experience large output voltage overshoot when input voltage increases rapidly, leading to potential damage to downstream electronic loads.
Innovation Solution
A voltage sensing circuit and feedback system are implemented to compare output voltage overshoot to a predetermined threshold, modifying control signals to prevent overshoot, using a comparator to generate feedback signals that adjust the switching patterns of primary and secondary side switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional DC/DC full bridge converter is used without voltage sensing circuit, then device complexity is reduced, but output voltage overshoot increases causing potential damage to loads
Solution Approach 1:
The voltage sensing circuit performs preliminary detection of output voltage before the overshoot can cause damage. The circuit senses voltage across the secondary winding and compares it against a reference threshold, enabling the control system to take preventive action before harmful overshoot occurs.
Solution Approach 2:
The patent implements a feedback mechanism where the voltage sensing circuit continuously monitors output voltage and feeds this information back to the control system. When voltage exceeds the threshold, the feedback signal triggers modification of control signals to the switches, creating a closed-loop control system that actively prevents voltage overshoot.
2Reliability
If voltage sensing circuit and feedback system are implemented, then output voltage overshoot is reduced, but device complexity increases
Solution Approach 1:
The feedback system compares the sensed output voltage against a reference threshold and generates a feedback signal that modifies the control signals to the switches. This closed-loop feedback mechanism ensures the output voltage remains within safe limits, significantly improving system reliability.
Solution Approach 2:
The voltage sensing circuit acts as an intermediary between the power conversion process and the control system. It provides the control system with information about output voltage conditions, enabling intelligent decision-making to prevent overshoot while maintaining simple switch control logic.
3Stability of the object's composition
If feedback signal modifies control signals to prevent overshoot, then output voltage stability is improved, but response time may be affected
Solution Approach 1:
The voltage sensing circuit performs preliminary detection of voltage conditions before overshoot occurs, allowing the control system to take preventive action in advance. This preliminary detection approach maintains stability while minimizing response time delays.
Solution Approach 2:
The feedback mechanism provides real-time voltage information to the control system, enabling rapid response to voltage deviations. The continuous monitoring and immediate feedback ensure both stability and fast response to changing conditions.
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 reduces output voltage overshoot, preventing damage to loads by ensuring the output voltage remains within a safe threshold during rapid changes in input voltage.
Implementation Method 1
A DC/DC converter changes the output voltage magnitude by temporarily converting input DC electrical power to alternate current (AC) electrical power
Implementation Method 2
Inductor 124 and capacitor 130 together act as a filter for smoothing an output voltage 148 across resistive load 132
Data Source
AI summary
The present invention provides a DC/DC converter for use with a DC input signal. The DC/DC converter includes a control signal generator, a primary and a secondary side, a voltage generating portion, a threshold voltage providing portion and a feedback signal generator. The control signal generator can control the primary side and the secondary side. The voltage generating portion can generate a surge voltage based a control signal from the control signal generator. The threshold voltage providing portion can generate a threshold voltage. The feedback signal generator can generate a feedback signal based on the surge voltage and the threshold voltage. The control signal generator can further modify control of one of the primary and secondary sides based on the feedback signal.