Power-Saving Line Interactive UPS High-Frequency Charging Circuit
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Solution Overview
Problem
Conventional line interactive UPS systems consume excess power while maintaining full battery capacity due to the use of low-frequency transformers and full-bridge switching circuits for battery charging.
Innovation Solution
A power-saving line interactive UPS incorporates a high-frequency charging circuit that directly converts AC power to DC power for battery charging, bypassing the low-frequency transformer and full-bridge switching circuit, and dynamically manages power flow using a main controller and charge/discharge mode controller to optimize charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low-frequency transformer and full-bridge switching circuit are used to charge the battery, then the battery can be charged through AC power conversion, but the power consumption increases by 0.5 W
Solution Approach 1:
The patent extracts and removes the low-frequency transformer and full-bridge switching circuit from the charging path. By eliminating these power-consuming components, the system achieves battery charging with reduced power consumption of 0.5 W, while maintaining the essential charging capability through a simplified circuit architecture.
Solution Approach 2:
The patent changes the operating parameters of the charging circuit by operating the switching circuit at high frequency instead of low frequency. This parameter change eliminates the need for a low-frequency transformer and reduces the power consumption associated with transformer operation and switching losses.
2Reliability
If the low-frequency transformer and full-bridge switching circuit are used for battery charging, then the battery maintains full power capacity, but additional power loss occurs
Solution Approach 1:
The patent removes the low-frequency transformer and full-bridge switching circuit from the system architecture. This extraction eliminates the energy losses associated with transformer core losses, copper losses, and switching losses, thereby reducing total power loss while preserving the battery's ability to maintain full power capacity through alternative charging pathways.
3Duration of action of stationary object
If the conventional charging circuit is used, then the battery can be charged during normal AC power supply, but the system consumes excess power
Solution Approach 1:
The patent changes the operating frequency parameter from low frequency to high frequency, which fundamentally alters the charging mechanism. This parameter change enables continuous battery charging during normal AC power supply while dramatically reducing power consumption by eliminating the need for power-intensive low-frequency transformer operation.
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 solution reduces power consumption by 0.5 W during normal AC power conditions and maintains full battery capacity without additional power loss, achieving a power-saving effect.
Implementation Method 1
a high-frequency charging circuit (16) connected between the AC power input terminal and the rechargeable battery (15) to convert the AC power into a DC power
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A power-saving line interactive UPS has a power switch set (10), a low-frequency transformer (11), a full-bridge switching circuit (12), a main controller (13), a charge and discharge mode controller (14), a rechargeable battery (15) and a high-frequency charging circuit (16). The high-frequency circuit is connected between an AC power input terminal and the rechargeable battery (15) to convert the AC power into a DC power and charge the rechargeable battery (15). Therefore, when the AC power is normally supplied and the power capacity of the rechargeable battery (15) is not full, the high-frequency charging circuit (16) is activated to charge the rechargeable battery (15) without charging the rechargeable battery (15) through the low-frequency transformer (11) and the full-bridge switching circuit (12), thereby effectively reducing overall power consumption.