SMPS Ripple Mode Control via Simulated Ramp Signal
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Solution Overview
Problem
Existing buck converters with ripple mode control face challenges in generating a ramp signal for stable voltage regulation due to the need for large equivalent series resistance, which decreases power efficiency and requires additional circuitry, and integrated compensation circuits have fixed values that cannot be adjusted for various applications.
Innovation Solution
A switching-mode power supply system that includes a ramp signal generator capable of simulating an output signal current, allowing for adjustable slope through an external resistor module, which is coupled to the control signal generator to produce a control signal for regulating the main switch and improving ripple mode control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large ripple component is used for stable ripple mode control, then control stability is improved, but power efficiency decreases and additional circuitry is required
Solution Approach 1:
The patent uses a compensation capacitor to generate a ramp voltage signal that copies the shape of the inductor current waveform. This copied signal provides the necessary large ripple component for stable control without requiring actual large ripple current, thus maintaining power efficiency while achieving control stability.
Solution Approach 2:
The compensation capacitor acts as an intermediary element that generates a ramp voltage signal proportional to the inductor current. This intermediary signal allows the control system to achieve stable ripple mode control without directly manipulating the actual inductor current ripple, thereby avoiding the need for large ESR and additional power-consuming circuitry.
2Reliability
If discrete components are used for compensation circuit, then ripple mode control is achieved, but device area and cost increase
Solution Approach 1:
The patent merges the compensation circuit functionality into the existing control signal generator by integrating the compensation capacitor with the PWM generator. This integration eliminates the need for separate discrete compensation components, reducing device area while maintaining ripple mode control capability.
Solution Approach 2:
The compensation capacitor serves multiple functions: it generates the ramp voltage signal for ripple mode control, compensates for the effects of small ESR output capacitors, and works within the existing control signal generator architecture. This multi-functionality eliminates the need for dedicated discrete compensation components.
3Ease of manufacture
If fixed value components are used in integrated compensation circuit, then manufacturing is simplified, but adaptability to various applications is reduced
Solution Approach 1:
The patent enables dynamic adjustment of the compensation capacitor value to adapt to different applications. By allowing the compensation capacitor value to be adjusted based on load conditions and application requirements, the system maintains ease of manufacture through standardized components while achieving versatility across different power supply applications.
Data Source
AI summary
The present invention discloses a SMPS. The SMPS comprises an output port, configured to supply a load; a control signal generator, having an input and an output configured to provide a first control signal; a first switch configured to receive the first control signal and regulate the voltage at the output port; and a ramp signal generator, comprising an input and an output, wherein the input is configured to receive the control signal and the output is configured to provide a current signal simulating an output signal at the output port, and wherein the output of the ramp signal generator is further coupled to the input of the means for generating control signal.