Multiphase Power Converter Control via Reference Signal Synchronization
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Solution Overview
Problem
Existing multiphase power converters lack precision and predictability in turning on and off power switches in response to changing reference signals, leading to inefficiencies and inaccuracies in output voltage control.
Innovation Solution
A method of controlling multiphase power converters by selectively and consistently turning on and off power switches in synchronization with reference signals, using counters to determine control signals based on the relationship between the reference signal and its prior value, allowing for precise timing of power switch operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed frequency and fixed magnitude saw-tooth waveforms are used to generate PWM signals, then the control method is simple, but the precision and predictability of power switch timing is poor
Solution Approach 1:
The patent transitions from fixed-frequency saw-tooth waveform comparison to a dynamic control method where the PWM signal generation is synchronized with the reference signal edges. The controller dynamically adjusts the timing of power switch operations based on when the reference signal increases or decreases, rather than relying on fixed-frequency carrier waves. This dynamic synchronization improves timing precision while maintaining manageable control complexity through systematic state tracking.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the reference signal state and uses this information to determine when to generate PWM signals. By comparing the current reference signal state with the previous state and tracking the phase state, the system creates a closed-loop control approach that improves timing accuracy without requiring complex fixed-frequency carrier generation.
2Speed
If power switches are turned on and off based on saw-tooth waveform timing, then the control implementation is straightforward, but the responsiveness to changing reference signals is poor
Solution Approach 1:
The patent prepares the control system by tracking the reference signal state in advance and maintaining phase state information. When the reference signal changes, the controller is already prepared with the necessary state information to immediately generate the appropriate PWM signal, eliminating delays associated with fixed-frequency carrier synchronization. This preliminary state tracking enables faster responsiveness while keeping the control mechanism systematic rather than overly complex.
3Manufacturing precision
If discrete phase operation is used with fixed timing, then the control logic is simple, but the accuracy of output voltage control is poor
Solution Approach 1:
The patent uses feedback by continuously monitoring the reference signal state and comparing it with the previous state to determine when to switch phases. The controller tracks the phase state and uses this feedback information to accurately control the timing of power switch operations, improving output voltage accuracy. The systematic feedback mechanism maintains manageable control logic complexity through organized state tracking and comparison.
Solution Approach 2:
The patent transitions from static discrete phase operation with fixed timing to dynamic phase control where the timing is adjusted based on reference signal edges. The controller dynamically determines when to turn on or off power switches by detecting increases or decreases in the reference signal, improving output voltage accuracy while maintaining systematic control logic through phase state tracking.
Data Source
AI summary
A method of controlling a multiphase power converter including a plurality of sub-converters coupled to provide power to a load is disclosed. Each sub-converter includes a power switch. The method includes selectively and consistently turning on the power switch of one or more of the sub-converters at substantially a same time as a reference signal representing a desired output of the power converter increases. The method further includes selectively and consistently turning off the power switch of one or more of the sub-converters at substantially a same time as the reference signal representing the desired output of the power converter decreases. Other methods, multiphase power converters and controllers for multiphase power converters are also disclosed.