DC/DC Converter Controller Slew Voltage Ramp
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Solution Overview
Problem
Conventional DC/DC converters experience abrupt changes in output voltage when reference voltage levels change, leading to potential damage and reduced lifespan due to sharp current increases in components.
Innovation Solution
A converter circuit with a controller that generates a slew voltage at a substantially constant rate when the reference voltage changes, allowing the output voltage to transition smoothly, thereby maintaining safe current levels through components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the reference voltage is changed abruptly to a new level, then the output voltage can be changed quickly to the desired level, but sharp current increases occur in the converter components causing potential damage and reduced lifespan
Solution Approach 1:
The patent applies preliminary action by generating a slew voltage ramp signal before changing the reference voltage level. This ramp signal pre-establishes a controlled voltage transition profile that limits the rate of change, preventing sharp current increases in the converter components while still achieving the desired voltage change.
Solution Approach 2:
The patent introduces an intermediary element - the slew voltage ramp signal - that mediates between the reference voltage input and the converter output. This intermediate signal smooths the transition by providing a gradual voltage change profile, eliminating abrupt steps that would cause harmful current spikes in the inductor and capacitor.
2Reliability
If a protection component is added to detect abnormal voltage conditions, then component damage is prevented, but the converter operation is terminated when reference voltage changes occur
Solution Approach 1:
The patent uses feedback by monitoring the slew voltage ramp signal and using it to control the converter operation. The controller adjusts the converter based on the ramp signal's voltage level, creating a feedback loop that maintains proper operation during reference voltage transitions and prevents false over-voltage detection that would terminate converter operation.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the converter operating parameters based on the slew voltage ramp signal. As the ramp signal transitions from the first voltage level to the second voltage level, the converter parameters are continuously adjusted to match, allowing smooth operation through the transition without triggering protection mechanisms.
3Adaptability or versatility
If the output voltage is changed abruptly by adjusting energy in inductor and capacitor, then voltage level switching is achieved, but sharp current increases damage components and shorten converter lifetime
Solution Approach 1:
The patent applies periodic action by using a controlled ramping process to transition the output voltage between levels. Instead of abrupt changes, the voltage follows a time-dependent ramp profile that gradually adjusts the energy in the inductor and capacitor, preventing harmful current spikes while maintaining the ability to switch between different voltage levels.
Solution Approach 2:
The patent uses parameter changes by continuously varying the voltage and current parameters during the transition process. The slew voltage ramp signal controls the rate of change of these parameters, ensuring they remain within safe limits while still achieving the desired voltage level switching capability.
Data Source
AI summary
A converter circuit includes a converter and a controller. The converter converts an input voltage to an output voltage. The controller receives a reference voltage, generates a slew voltage having a substantially constant first slew rate if the reference voltage changes from a first level to a second level, and controls the converter based on the slew voltage to cause the output voltage to change from a third level to a fourth level at a substantially constant second slew rate.