Voltage Regulator Constant Loop Gain Control
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Solution Overview
Problem
Voltage regulators with integrated compensation configurations become unstable when output voltage changes, as fixed compensation is optimal only for one voltage level, leading to loop gain offsets and system instability across a wide range of output voltages.
Innovation Solution
Implementing a constant loop gain control mechanism that uses a feed-forward circuit to cancel the impact of the external voltage divider's gain on the loop gain, by combining the error amplifier's output with a filtered version of the output voltage to generate a stable PWM signal, independent of the voltage divider's resistance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed compensation configuration is used, then the voltage regulator is simple to implement, but the system becomes unstable when output voltage changes
Solution Approach 1:
The patent applies dynamics by making the compensation signal adaptive rather than fixed. The compensator dynamically adjusts the compensation signal based on the actual output voltage level, allowing the system to maintain stability across a wide range of output voltages. This is achieved through a feedback mechanism that senses the output voltage and modifies the compensation accordingly, transforming the static compensation approach into a dynamic one.
Solution Approach 2:
The patent implements feedback by introducing a mechanism that senses the output voltage and uses this information to adjust the compensation signal. The system continuously monitors the output voltage level and feeds this information back to the compensator, which then modifies the compensation signal to maintain optimal loop gain. This closed-loop feedback approach ensures stability regardless of output voltage changes.
2Ease of manufacture
If fixed compensation is optimized for one voltage level, then the compensation parameters are simple to design, but loop gain offsets occur when output voltage changes
Solution Approach 1:
The patent applies parameter changes by making the compensation signal variable rather than fixed. Instead of designing for a single optimal voltage level, the system dynamically changes the compensation parameter based on the actual output voltage. This allows the loop gain to remain accurate across different voltage levels, eliminating the loop gain offsets that would occur with fixed compensation optimized for one voltage.
3Reliability
If the voltage regulator is designed for stable operation across wide voltage range, then the system becomes more reliable, but the control mechanism becomes more complex
Solution Approach 1:
The patent applies self-service by implementing an automatic adjustment mechanism that senses the output voltage and self-corrects the compensation signal without external intervention. The system serves itself by using its own output voltage information to maintain optimal loop gain, eliminating the need for complex external tuning or multiple fixed compensation circuits for different voltage levels.
Data Source
AI summary
A voltage regulation circuit includes a power stage for generating a regulated output voltage responsive to an input voltage and at least one PWM signal. A voltage divider circuit is connected to the output of the power stage and generates a feedback voltage. First circuitry generates the at least one PWM signal responsive to a voltage error signal, a filtered output voltage signal and a ramp voltage signal. The filtered output voltage is used for substantially removing loop gain change caused by the voltage divider circuit. A voltage compensation circuit generates the voltage error signal responsive to a feedback voltage and a reference voltage.