Synchronous Power Converter Frequency Offset Control
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Solution Overview
Problem
Conventional current mode DC-DC converters suffer from frequency offset and slow response, leading to poor performance and interference across multiple transmission channels due to differing frequencies, which affects power management and energy conservation standards.
Innovation Solution
A synchronous power converter system is introduced, featuring a processor circuit that outputs clock signals of the same frequency to multiple power converters, each equipped with an oscillator, frequency detector, compensator, and switch circuit, which work in tandem to synchronize operations and enhance bandwidth by adjusting the transconductance gain of the error amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current mode DC-DC converters are used, then the system can operate with simple structure, but frequency offset and slow response occur leading to poor performance
Solution Approach 1:
The patent implements a feedback mechanism where the frequency detector circuit continuously monitors the oscillation frequency of each power converter and compares it with the clock signal frequency. The compensator circuit then generates compensating signals based on this frequency deviation feedback to adjust the oscillation frequency, thereby resolving the frequency offset problem while maintaining system performance
Solution Approach 2:
The patent replaces conventional mechanical or simple electronic frequency adjustment methods with an electronic feedback control system. The frequency detector circuit uses electronic signal processing to detect frequency deviations, and the compensator circuit uses electronic compensation techniques to adjust the oscillation frequency, eliminating the need for complex mechanical adjustment mechanisms
2Reliability
If different frequency power converters are used, then device complexity is reduced, but frequency offset affects multiple transmission channels resulting in poor overall performance
Solution Approach 1:
The patent implements a universal frequency synchronization mechanism that can be applied to multiple power converters simultaneously. The frequency detector circuit and compensator circuit are designed to work with any number of power converters, providing a multi-functional solution that synchronizes all converters to the same clock frequency, thereby improving overall system performance without requiring different solutions for each converter
Solution Approach 2:
The patent introduces a clock signal as an intermediary reference that mediates the frequency synchronization between multiple power converters. The frequency detector circuit compares each converter's oscillation frequency with this intermediate clock signal, and the compensator circuit uses this intermediate reference to generate appropriate compensating signals, thereby achieving coherent frequency alignment across all converters
3Productivity
If conventional power converters are used to meet power management standards, then energy conservation requirements are difficult to satisfy, but increasing conversion frequency improves transient response
Solution Approach 1:
The patent implements dynamic frequency adjustment where the power converters operate at different frequencies based on real-time load conditions. The frequency detector circuit continuously monitors the operating conditions and the compensator circuit dynamically adjusts the oscillation frequency, allowing the system to achieve fast transient response when needed while consuming less energy during steady-state operation
Solution Approach 2:
The patent changes the operating frequency parameter of the power converters based on load conditions. The frequency detector circuit detects frequency deviations and the compensator circuit adjusts the oscillation frequency parameter dynamically, enabling the system to optimize the trade-off between transient response speed and power consumption by operating at higher frequencies during transients and lower frequencies during steady-state
Data Source
AI summary
A synchronous power converter system is provided. The system includes a processor circuit and a plurality of power converters. The processor circuit outputs a plurality of clock signals having the same frequency. The power converters respectively receive the clock signals. Each of the power converters includes an oscillator circuit, a frequency detector circuit, a compensator circuit, a controller circuit, and a switch circuit. The oscillator circuit outputs an oscillation signal. The frequency detector circuit receives the clock signal and the oscillation signal and detects a clock frequency of the clock signal and an oscillation frequency of the oscillation signal to output a frequency detected signal. The compensator circuit outputs a compensating signal according to the frequency detected signal. The controller circuit controls the switch circuit according to the compensating signal.