Multi-Phase Interleaving Power Supply with Dead Beat Control
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Solution Overview
Problem
Conventional power supply devices for RF applications face challenges in achieving wideband pulse power control due to limitations in interleaving control systems, including secondary oscillations, complexity in current detection, and inflexible pulse width settings, which hinder rapid response and adaptability to high-frequency operations.
Innovation Solution
The implementation of a multi-phase interleaving control system using dead beat control, which computes pulse widths based on combined phase current values to allow overlapping pulse widths, enabling stable and adaptable power control across a wideband frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constant voltage control based on output voltage feedback is used in interleaving control, then voltage regulation is achieved, but secondary oscillating voltage occurs causing overshoot or undershoot, requiring low-speed control response which fails to provide rapid response
Solution Approach 1:
The patent introduces an intermediary control mechanism by using the switching signals of multiple phases as the control input, rather than directly controlling the output voltage. The controller computes pulse widths for each phase based on their respective switching signals, and these pulse widths serve as intermediaries that indirectly regulate the output voltage while avoiding direct feedback-induced oscillations. This intermediary approach allows rapid response without overshoot or undershoot.
2Speed
If multi-phase interleaving control is implemented to provide wideband pulse power control, then rapid response is achieved, but secondary oscillating voltage occurs causing overshoot or undershoot of output voltage
Solution Approach 1:
The patent segments the control into multiple independent phase controllers, each handling a specific phase with its own pulse width computation. By dividing the overall power control into segmented phase-level controls rather than a unified voltage control, the system achieves rapid response through interleaved switching while preventing secondary oscillations that would occur in a centralized voltage feedback system.
3Device complexity
If conventional interleaving control with non-overlapping pulse widths is used, then control simplicity is maintained, but adaptability to wideband frequency range is limited due to inflexible pulse width settings
Solution Approach 1:
The patent implements dynamic pulse width adjustment by computing the pulse width for each phase based on its switching signal and the desired power level. This dynamic computation allows the pulse widths to overlap when needed for wideband operation, providing flexibility across frequency ranges while maintaining relatively simple control logic through standardized pulse width computation formulas for each phase.
4Reliability
If phase current detection is implemented for each phase in interleaving control, then current balance and protection are improved, but device complexity increases due to multiple detectors and complex control
Solution Approach 1:
The patent employs self-service current detection by utilizing the existing switching signals and voltage measurements already present in the circuit. Each phase controller computes its pulse width based on its switching signal and the common output voltage, effectively using available circuit elements to provide current balance protection without requiring additional dedicated current detectors for each phase, thus maintaining reliability while reducing complexity.
Data Source
AI summary
Provided is multi-phase interleaving control in a power supply device, the control allowing the pulse widths ΔT of respective phases to overlap one another, so as to be adaptable to wideband pulse power control. In applying dead beat control to the multi-phase interleaving, constant current control is performed using combined current of the respective phase current values, and the pulse widths ΔT(k) is computed under this constant current control, thereby preventing variation of the pulse widths ΔT(k) between the phases, and achieving stable power control. Accordingly, the pulse power control becomes adaptable to wideband. Furthermore, wideband control is possible also in two-level pulse power control that performs control by switching at high frequency between High-level power and Low-level power.