PWM Regulator Transient Response via Threshold Comparators
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Solution Overview
Problem
Pulse width modulated switching regulator circuits struggle to maintain regulated voltage within narrow tolerance under high-frequency transient loads, leading to output voltage dips or rises that can cause data errors and inconsistent circuit operations, while maintaining power efficiency is a challenge due to the shrinking semiconductor device sizes.
Innovation Solution
A pulse width modulated switching regulator circuit with a high threshold voltage comparator and low threshold voltage comparator, along with immediate reset and set pulse generators, adjusts the duty cycle of the voltage regulator by modifying the pulse width modulation ramp signals to quickly respond to transient loads, ensuring the output voltage remains within acceptable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pulse width modulated switching regulator circuits are used to maintain power efficiency, then power efficiency is improved, but output voltage stability deteriorates under high-frequency transient loads
Solution Approach 1:
The patent applies preliminary action by using high and low threshold voltage comparators to detect transient load conditions before they cause significant output voltage deviations. The immediate set and reset pulse generators proactively adjust the duty cycle in response to threshold crossings, preventing voltage dips or rises before they occur. This anticipatory control mechanism maintains output voltage stability while preserving the power efficiency benefits of pulse width modulation.
Solution Approach 2:
The patent implements feedback through threshold voltage comparators that continuously monitor the output voltage and provide feedback signals to the pulse width modulation controller. When the output voltage crosses predefined high or low thresholds, the comparators generate feedback that triggers immediate duty cycle adjustments. This feedback mechanism enables the system to maintain voltage stability under transient loads while operating in efficient pulse width modulation mode.
2Stability of the object's composition
If the pulse width modulation frequency is increased to respond to high-frequency transient loads, then output voltage stability is improved, but power efficiency deteriorates
Solution Approach 1:
The patent applies partial action by using threshold voltage comparators that trigger duty cycle adjustments only when output voltage crosses specific high or low thresholds. Rather than continuously adjusting the duty cycle at every switching cycle, the system performs partial adjustments only when necessary to correct voltage deviations. This selective approach maintains output voltage stability under transient loads while minimizing the impact on power efficiency by avoiding excessive switching activity.
3Stability of the object's composition
If immediate set and reset pulse generators are added to quickly respond to transient loads, then output voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the voltage regulation function into distinct components: high threshold comparator, low threshold comparator, immediate set pulse generator, and immediate reset pulse generator. Each component performs a specific function in detecting and responding to output voltage deviations. This segmented architecture improves output voltage stability under transient loads while keeping each individual component relatively simple, thereby managing overall device complexity through functional decomposition.
Data Source
AI summary
A switching rectifier circuit includes a pulse width modulation controller, a voltage switching circuit, a pulse width modulation comparator, an error amplifier, a voltage reference, a high threshold voltage comparator and a low threshold voltage comparator. A varying output voltage of the voltage regulator is sampled and compared to a high threshold voltage reference and a low threshold voltage reference. When the sampled output voltage is equal to or greater than the high threshold voltage reference the output voltage is decreased. When the sampled output voltage is equal to or less than the low threshold voltage reference the output voltage is increased.