Quantum Charge Modulator for Stable Power Converter Control
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Solution Overview
Problem
Switch-mode power supplies face challenges in maintaining stable and efficient performance over a wide range of operations, particularly in responding to load transients and component changes, which can lead to overshoot, undershoot, and ringing.
Innovation Solution
The implementation of a quantum charge modulator that dynamically compensates by modulating the frequency of a switch signal, using a compensation processor to maintain an average switching frequency over a predetermined number of cycles, and applying a forgetting factor to calculate and compensate errors, thereby providing a stable and fast transient response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the switching frequency is increased to improve transient response speed, then the response time to load changes is reduced, but the average switching frequency becomes unstable and causes oscillations
Solution Approach 1:
The patent implements a multi-cycle averaging mechanism where the switching frequency is modulated periodically over N cycles. The compensation signal is updated every N cycles based on the accumulated phase deviation, creating a periodic correction action that maintains long-term frequency stability while allowing short-term frequency variations for fast transient response.
Solution Approach 2:
The patent employs a feedback mechanism where the phase deviation ΔTSW is continuously measured and fed back to generate a compensation signal. This compensation signal adjusts the switching frequency dynamically, creating a closed-loop control system that automatically corrects frequency deviations and maintains stability during transients.
2Measurement precision
If complex compensation circuits are added to improve transient response performance, then the transient response accuracy is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent replaces complex analog compensation circuits with a digital implementation. The compensation processor executes digital algorithms to calculate phase deviation and generate compensation signals, substituting mechanical/electronic circuit complexity with programmable logic that achieves the same control objectives with reduced hardware complexity and power consumption.
Solution Approach 2:
The patent changes the control parameter from direct voltage compensation to phase deviation-based frequency modulation. By measuring the phase deviation ΔTSW between the stable pulse modulated signal and the measured pulse modulated signal, and using this to modulate the switching frequency, the system achieves accurate transient response through parameter transformation rather than complex circuitry.
3Productivity
If the switching frequency is modulated rapidly to improve transient response, then the response to load disturbances is faster, but the control loop becomes unstable and exhibits oscillations
Solution Approach 1:
The patent accumulates phase deviation over N cycles before applying compensation, effectively performing preliminary measurement and integration. This preliminary action allows the system to build up sufficient error signal to drive the compensation, ensuring that the control loop has enough drive to correct transients while the multi-cycle averaging prevents overreaction and oscillations.
Data Source
AI summary
Apparatus and associated methods relate to modulating the frequency of a switch signal to achieve a fast transient response while holding the average frequency constant over a predetermined number of N cycles. In an illustrative example, a quantum charge modulator may include a compensation processor configured to compensate an error signal and generate a compensation signal by performing operations to maintain an average switching frequency over the N cycles in response to the transient. The compensation signal may be a function of a real phase deviation ΔTSW between a stable pulse modulated signal having a cycle period TSW before the transient and a measured pulse modulated signal having a cycle period TSW_M after the transient. A forgetting factor may be used to calculate the phase deviations. The quantum charge modulator may provide a compensation free, stable, and high performance response over power stage component changes.