UPS Carrier Signal Generator for Synchronous Rectification Control
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Solution Overview
Problem
Conventional carrier signal generators for uninterruptible power supplies (UPS) face challenges in synchronously controlling universal power units, leading to phase asynchrony and harmonic pollution during three-phase AC power rectification. Additionally, they struggle to compatibly output pulse width modulation signals for both rectification control and DC-DC conversion.
Innovation Solution
A carrier signal generator architecture that includes a master processing module and N slave processing modules, where the master module outputs a reference signal indicating the state of the mains, and the slave modules receive this signal to control universal power units for synchronous rectification or independent DC-DC conversion. This architecture uses a combination of digital signal processing chips and complex programmable logic devices (CPLDs) or field-programmable gate arrays (FPGAs) to generate and control the necessary pulse width modulation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dedicated DSP chips are used to execute pre-packaged control logic, then computing efficiency is improved, but expandability and compatibility with various hardware circuits deteriorate
Solution Approach 1:
The control system is segmented into a master processing module that generates reference signals and N slave processing modules that independently generate control signals for each universal power module. This segmentation allows each module to be optimized for specific functions while maintaining overall system coordination, resolving the contradiction between computing efficiency and adaptability.
Solution Approach 2:
The carrier signal generator is designed with universal processing modules that can handle multiple functions: generating rectification control signals for AC-DC conversion and DC-DC conversion signals for battery power management. The slave processing modules can adaptively switch between different control modes based on power source status, achieving multi-functionality without requiring dedicated chips for each function.
2Reliability
If another carrier signal generator is added to synchronously output rectification control signals, then synchronous rectification control is improved, but compatibility with DC-DC conversion control deteriorates
Solution Approach 1:
The slave processing modules are designed as universal controllers that can generate both rectification control signals (synchronized with reference signal) and DC-DC conversion control signals (independent of reference signal). This multi-functionality allows a single carrier signal generator to handle both AC-DC and DC-DC conversion without requiring separate dedicated generators, maintaining reliability while ensuring compatibility.
3Adaptability or versatility
If N slave processing modules independently generate control signals, then adaptability to different power sources is improved, but synchronous rectification control deteriorates
Solution Approach 1:
The master processing module acts as an intermediary that distributes synchronized reference signals to all N slave processing modules. This intermediary mechanism ensures that all slave modules operate in synchronization during rectification mode while retaining the ability to independently generate DC-DC conversion signals when adapting to different power sources, thus maintaining both synchrony and adaptability.
Data Source
AI summary
Carrier signal generators are provided. The carrier signal generator includes a master processing module and a plurality of slave processing modules. Each slave processing module is used to control a corresponding one of universal power units of the UPS. The slave processing modules output, according to a synchronously received reference signal, control signals to control the universal power units to receive power from the mains or a rechargeable battery. When the mains is normal, each slave processing module synchronously generates a three-phase rectification control signal to rectify and output power from the mains. When the mains is abnormal, each slave processing module generates a first DC-DC control signal independently of the reference signal output by the master processing module, so as to convert and output power from the rechargeable battery. The carrier signal generator has improved compatibility and improved current conversion quality and is low cost.