Power Converter Synchronization Circuit for Wide-Range Phase Alignment
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Solution Overview
Problem
Synchronizing the frequency and phase of multiple variable frequency power converters is challenging due to component tolerances and the need for independent timers, especially when operating at maximum or minimum frequency limits, making it difficult to maintain synchronized operation across a wide frequency range.
Innovation Solution
An integrated time-base system with synchronization circuits that coordinate switching frequencies and phase relationships among power converters, using a daisy-chain loop configuration to ensure synchronization, frequency clamping, and restart timer functionality, allowing for unified control of switching frequencies and phase alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent timers or oscillators are used for each power converter to implement synchronization, maximum frequency limit, and minimum frequency limit functions, then each converter can operate independently, but synchronization between converters becomes difficult due to component tolerances and frequency variations
Solution Approach 1:
A master converter is selected as an intermediary reference that generates a synchronized clock signal distributed to all slave converters. This master converter acts as a mediator that coordinates the switching frequencies of all converters in the system, ensuring they operate at the same frequency while maintaining independent operation capabilities through the daisy-chain connection topology.
Solution Approach 2:
The synchronization circuit monitors the switching frequency of each converter and provides feedback control to adjust and maintain synchronized operation. The circuit detects frequency deviations caused by component tolerances and automatically corrects them by adjusting the switching frequency to match the master converter, ensuring reliable synchronization across the entire system.
2Reliability
If analog circuitry is used to implement maximum frequency limit with short timer and minimum frequency limit with long timer, then frequency limits can be enforced, but matching these timers across a wide frequency range is very difficult
Solution Approach 1:
The synchronization circuit merges the maximum frequency limit function, minimum frequency limit function, and synchronization function into a single integrated circuit block. This unified implementation eliminates the need for separate analog timers that would require precise matching, as all three functions share the same digital timing resources and control logic, significantly reducing implementation complexity.
Solution Approach 2:
The patent replaces analog timer circuits with digital timing mechanisms implemented through counters and state machines. This substitution eliminates the difficulty of matching analog timer components across wide frequency ranges, as digital circuits can be precisely controlled through software or programmable logic, providing accurate frequency limiting without component matching issues.
3Productivity
If variable frequency power converters operate at their natural frequencies determined by component values, then each converter can operate efficiently, but the natural frequencies differ due to component tolerances making synchronization difficult
Solution Approach 1:
The system dynamically adjusts the switching frequency of each converter based on real-time synchronization requirements rather than operating at fixed natural frequencies. The synchronization circuit continuously monitors and adjusts frequencies to maintain synchronization, allowing converters to temporarily deviate from their optimal natural frequencies when necessary to maintain system-wide synchronization, with minimal impact on overall efficiency.
Data Source
AI summary
In an embodiment, a power converter system includes a plurality of variable frequency power converters and a plurality of synchronization circuits. Each variable frequency power converter has a switching frequency. Each synchronization circuit is associated with a respective one of the plurality of variable frequency power converters. A control circuit is coupled to and coordinates the plurality of synchronization circuits. The plurality of synchronization circuits and the control circuit are operable to synchronize the switching frequencies of the variable frequency power converters to each other. Each synchronization circuit is operable to: receive a first input signal indicative of the beginning of a switching period for the associated variable frequency power converter; receive a second input signal indicative of the end of the switching period for the associated variable frequency power converter; generate a first output signal for directing a pulse width modulation of the associated variable frequency power converter; and generate a second output signal for coordinating a phase relationship with another variable frequency power converter in the system.