Multiphase Interleaving Converter Transient Response Control
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Solution Overview
Problem
Multiphase interleaving converters face challenges in responding quickly to sudden load transients due to the interleaving driving mechanism, which causes some phases to remain inactive, and the repeatability of the error amplifier's Gain Bandwidth Product (GBWP) affects the converter's performance, leading to instability and incomplete voltage support during transients.
Innovation Solution
A control method that detects load transients by simultaneously turning on all phases and recovering the interleaving phase shift, using a spurious driving signal to zero the phase shift and ensure all phases contribute to voltage support, while maintaining a stable operation by regulating the detection impulse signal and using an OR driving architecture to synchronize phase activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the interleaving driving mechanism is used to operate multiple phases, then the converter achieves efficient power delivery and reduced ripple, but the response speed to sudden load transients deteriorates because some phases remain inactive during transients
Solution Approach 1:
The patent applies dynamics by making the phase shift parameter adjustable rather than fixed. During load transients, the phase shift is dynamically reduced or eliminated to activate all phases simultaneously, maximizing response speed. During steady-state operation, the normal interleaving phase shift is restored to maintain efficiency and reduce ripple. This dynamic adaptation resolves the contradiction between efficient power delivery and fast transient response.
2Speed
If the error amplifier's Gain Bandwidth Product (GBWP) is increased to improve transient response, then the converter's response to load changes improves, but stability deteriorates due to repeatability issues and oscillation risks
Solution Approach 1:
The patent applies preliminary action by detecting load transients before they fully develop and preemptively adjusting the phase shift to activate all phases. The transient detector monitors voltage changes and triggers phase alignment in advance, allowing the converter to respond to transients without relying on high GBWP that would compromise stability. This proactive approach improves transient response while maintaining stable operation.
3Power
If all phases are activated simultaneously during load transients, then the output voltage support improves, but the interleaving phase shift is disrupted causing incomplete response recovery
Solution Approach 1:
The patent applies parameter changes by temporarily modifying the phase shift parameter during load transients. When a transient is detected, the phase shift is changed to zero or a reduced value to activate all phases simultaneously, providing maximum output voltage support. After the transient condition clears, the phase shift parameter is restored to its normal interleaving value, ensuring complete recovery of the interleaved operation. This controlled parameter modification resolves the contradiction between immediate power support and maintaining phase shift integrity.
Data Source
AI summary
A method is provided for controlling a converter of the multiphase interleaving type. According to the method, there is detected when a change of the load applied to an output terminal of the converter occurs. All the phases of the converter are simultaneously turned on, and a driving interleaving phase shift is recovered to restart a normal operation of the converter. A controller for carrying out such a method is also provided.