Low-Radiation UPS Circuit Topology Eliminates Inversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing on-line uninterruptible power supplies (UPS) have complex circuits, low efficiency, high electromagnetic interference (EMI), low reliability, and high costs due to the AC-DC-AC conversion mode, which includes unnecessary inversion steps causing faults and EMI.
Innovation Solution
The proposed UPS eliminates the inversion step by rectifying AC from the power network to DC, using a battery control unit for charging and switching between AC and battery power, and includes an EMI filter unit to reduce EMI, with a switching unit that selectively outputs DC from the rectifying unit or battery, thereby simplifying the circuit and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC-DC-AC conversion mode is used in UPS, then power supply continuity is achieved, but circuit complexity increases and EMI is generated
Solution Approach 1:
The patent extracts and removes the inversion unit from the traditional AC-DC-AC conversion system, keeping only the necessary rectification and battery components. This simplifies the circuit while maintaining power supply continuity through direct DC output and battery backup.
Solution Approach 2:
The patent converts the harmful EMI generated by inversion operations into a benefit by eliminating the inversion step entirely. The system achieves power continuity through direct DC-DC conversion and battery management, transforming the problematic AC-AC inversion process into a simpler DC-based architecture.
2Power
If inversion step is included in UPS, then power conversion is achieved, but EMI is generated and reliability decreases
Solution Approach 1:
The inversion unit that generates EMI is extracted and removed from the system. The patent achieves power conversion through rectification only (AC to DC), eliminating the source of electromagnetic interference while maintaining necessary power conversion functionality.
Solution Approach 2:
The patent replaces the mechanical/electrical inversion process with a DC-DC conversion approach using battery and rectifier components. This substitution eliminates the high-frequency switching EMI associated with traditional inversion while achieving the same power conversion objective.
3Stability of the object's composition
If traditional rectification and inversion process is used, then power supply stability is achieved, but cost and size increase
Solution Approach 1:
The patent removes the inversion unit and associated control circuits from the traditional UPS architecture, reducing system size and cost. Power supply stability is maintained through direct rectification and battery backup without requiring complex inversion hardware.
Solution Approach 2:
The patent applies local quality by using a simplified rectifier and battery configuration only where needed for power stability, rather than implementing a full AC-DC-AC conversion system throughout. This localized approach reduces overall system complexity while maintaining stability at critical points.
4Power
If double rectification is performed in UPS and load, then power conversion is achieved, but EMI increases
Solution Approach 1:
The patent extracts and eliminates one of the two rectification stages by implementing rectification only in the UPS unit, not in the load. This single rectification approach maintains necessary power conversion while reducing EMI compared to double rectification systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves reliability, reduces EMI and size, lowers costs, and meets energy conservation and environmental friendliness requirements by eliminating unnecessary rectification and inversion, resulting in a more efficient and cost-effective power supply.
Implementation Method 1
the rectifying unit rectifies an AC from a power network or other equipment and outputs a DC
Implementation Method 2
a battery is controlled by the battery control unit to be charged and outputs a DC during interruption of the AC from the power network
Implementation Method 3
a filter unit performs electromagnetic interference filtering on the AC
Data Source
AI summary
An AC-DC type uninterruptible power supply includes a rectifying unit, a battery control unit and a switching unit, wherein the rectifying unit is used for rectifying an AC from a power network and outputting a DC; a battery is controlled by the battery control unit to be charged or discharged and outputs a DC during interruption of the AC from the power network; and the switching unit is used for selectively outputting the DC from the rectifying unit or the DC from the battery. Inversion of the UPS and double rectification of a load are omitted.