Interleaving Control in Multi-Phase Switching Regulators
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Solution Overview
Problem
Existing switching regulators face challenges in maintaining constant phase differences between sub-output voltages with multiple phases, which can lead to variations in output voltage due to changes in phase differences.
Innovation Solution
A multi-phase switching regulator is designed with a first and second regulating circuit that generate sub-output voltages with different phases, and an interleaving circuit that compares a reference voltage with the output voltage to generate set signals that maintain constant phase differences between sub-output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multi-phase regulating circuits are used to generate sub-output voltages, then power efficiency and output voltage variety are improved, but phase difference variations cause output voltage instability
Solution Approach 1:
The interleaving circuit uses feedback control by comparing the output voltage with a reference voltage to generate set signals that maintain constant phase differences between sub-output voltages. The circuit continuously monitors the output voltage and adjusts the switching timing of multiple regulating circuits to keep phase differences constant, thereby stabilizing the output voltage while maintaining high power efficiency.
Solution Approach 2:
The system dynamically adjusts the switching timing of multiple regulating circuits based on real-time output voltage conditions. The interleaving circuit generates set signals that adaptively control the phase differences between sub-output voltages, allowing the system to maintain stability under varying load conditions while preserving the high efficiency benefits of multi-phase operation.
2Use of energy by moving object
If multiple regulating circuits operate with different phases, then power efficiency is improved, but current differences between circuits increase
Solution Approach 1:
The interleaving circuit incorporates feedback control to monitor and adjust current distribution among multiple regulating circuits. By comparing output voltage with reference voltage and generating appropriate set signals, the circuit ensures balanced current flow across all phases while maintaining the phase differences necessary for high efficiency operation.
3Device complexity
If phase differences between sub-output voltages are allowed to vary, then device complexity is reduced, but output voltage stability deteriorates
Solution Approach 1:
The interleaving circuit uses a relatively simple feedback control mechanism that compares output voltage with a reference voltage to generate set signals. This feedback approach maintains constant phase differences between sub-output voltages without requiring complex control circuitry, achieving output voltage stability with minimal additional complexity.
Data Source
AI summary
A multi-phase switching regulator and a switching regulating method using the multi-phase switching regulator employ an interleaving circuit. The multi-phase switching regulator includes: a first regulating circuit configured to receive an input voltage and generate a first sub-output voltage with a first phase by transforming the input voltage in response to a first set signal; a second regulating circuit configured to receive the input voltage and generate a second sub-output voltage with a second phase by transforming the input voltage in response to a second set signal; and the interleaving circuit configured to repeatedly and sequentially generate the first set signal and the second set signal by comparing a reference voltage with an output voltage generated based on the first sub-output voltage and the second sub-output voltage.