DC-DC Converter Pulse Modulation Control for Load Transients
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Solution Overview
Problem
DC-DC converter circuits face challenges in efficiently controlling output signal values and maintaining stability, particularly during abrupt load changes, where existing pulse modulation techniques may take time to regulate the output signal to its desired value.
Innovation Solution
The implementation of a control circuit that concurrently adjusts two pulse modulation control parameters, such as duty cycle and frequency, using multiple control loops and feedback mechanisms to rapidly respond to changes in the output signal, allowing for immediate adjustments during ongoing pulse periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional pulse width modulation or pulse frequency modulation is used to regulate the output signal, then the output signal can be controlled to a desired value, but it takes time to regulate the output signal during abrupt load changes
Solution Approach 1:
The control is segmented into two independent control loops: a first control loop that adjusts the duty cycle of pulse modulation, and a second control loop that adjusts the frequency of pulse modulation. Each loop operates independently to control different aspects of the pulse modulated signal, allowing simultaneous optimization of response speed and stability.
Solution Approach 2:
The patent merges pulse width modulation and pulse frequency modulation into a unified control system where both duty cycle and frequency are adjusted concurrently based on error signals from respective control loops, enabling coordinated control for improved transient response and stability.
2Reliability
If the duty cycle of pulse width modulation is adjusted to regulate the output signal, then the output signal value is controlled, but the regulation process is slow during load changes
Solution Approach 1:
The system dynamically adjusts both the duty cycle and frequency of pulse modulation based on real-time error signals from two control loops. This dynamic dual-parameter adjustment enables the system to respond quickly to load changes while maintaining accurate output signal control, overcoming the slowness of single-parameter adjustment.
3Reliability
If pulse frequency modulation is used to regulate the output signal, then the output signal can be controlled, but the response to abrupt load changes is delayed
Solution Approach 1:
The control function is segmented between two loops: the first control loop handles duty cycle adjustment for baseline control accuracy, while the second control loop handles frequency adjustment for rapid response to transient load changes. This segmentation allows each loop to optimize for its specific function without compromising the other.
Solution Approach 2:
The second control loop is designed to detect load changes and adjust frequency in advance or simultaneously with the first control loop's duty cycle adjustment, providing preliminary action that accelerates the overall response time while maintaining stability through coordinated control.
Data Source
AI summary
In a device, a pulse modulation switching logic is provided to generate switching signals of a pulse modulator so as to generate a pulse modulated signal with a first pulse modulation control parameter and a second pulse modulation control parameter. The first pulse modulation control parameter is controlled on the basis of a first control signal, and the second pulse modulation control parameter is controlled on the basis of a second control signal. A first control loop is provided to generate the first control signal from an output signal derived from the pulse modulated signal. A second control loop is provided to generate the second control signal on the basis of the output signal. The first and second control signals are applied to concurrently control the first and second pulse modulation control parameters.