Line Interactive UPS Voltage Regulation via Rectifying and Buck Circuit
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Solution Overview
Problem
Conventional line interactive UPS systems rely on automatic voltage regulators (AVRs) that are large, heavy, costly, and energy-intensive, reducing electrical energy utilization efficiency and increasing costs.
Innovation Solution
A line interactive UPS design that includes a chargeable and dischargeable device, DC/AC inverter, rectifying and buck circuits, a full-bridge inverter, and a capacitor, with a controlling method that manages voltage regulation through pulse width modulation and switching to eliminate the need for an AVR, using fewer components and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an automatic voltage regulator (AVR) is connected to the input for mains supply to regulate output voltage, then the output voltage stability is improved, but the device size, weight, cost and energy consumption increase
Solution Approach 1:
The patent removes the traditional AVR component from the system and replaces it with a rectifying and buck circuit that integrates voltage regulation functionality directly into the power conversion path. This extraction of the AVR and replacement with a more efficient circuit topology resolves the contradiction by eliminating the energy consumption and size penalties associated with conventional AVRs while maintaining voltage stability.
Solution Approach 2:
The rectifying and buck circuit performs multiple functions: it rectifies the AC input voltage and simultaneously regulates it to a stable DC level. This multi-functional approach replaces the separate AVR device, reducing overall system complexity and energy consumption while achieving the same voltage stability objective.
2Stability of the object's composition
If an automatic voltage regulator (AVR) is connected to the input for mains supply to regulate output voltage, then the output voltage stability is improved, but the device size and weight increase
Solution Approach 1:
The patent combines the rectification and voltage regulation functions into a single integrated rectifying and buck circuit. This merging of functions eliminates the need for a separate AVR device and its associated heavy components, thereby reducing device weight while maintaining voltage stability through the unified circuit architecture.
3Stability of the object's composition
If an automatic voltage regulator (AVR) is connected to the input for mains supply to regulate output voltage, then the output voltage stability is improved, but the cost increases
Solution Approach 1:
The patent extracts the AVR component from the system and replaces it with a rectifying and buck circuit that achieves voltage regulation more cost-effectively. This removal of the expensive AVR and its replacement with a simpler, more integrated circuit solution reduces manufacturing costs while maintaining the required output voltage stability.
4Stability of the object's composition
If an automatic voltage regulator (AVR) is connected to the input for mains supply to regulate output voltage, then the output voltage stability is improved, but the electrical energy utilization efficiency decreases
Solution Approach 1:
The patent replaces the traditional mechanical/electromagnetic AVR system with an electronic rectifying and buck circuit that operates more efficiently. This substitution eliminates the energy losses inherent in conventional AVR mechanisms while achieving the same voltage regulation objective, thereby improving electrical energy utilization efficiency.
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
The solution provides stable AC output with improved energy utilization efficiency, reduced costs, and avoids waveform distortion and inrush currents, making it suitable for various loads without the need for an AVR.
Implementation Method 1
a chargeable and dischargeable device
Implementation Method 2
a DC/AC inverter, an input of which is connected across the chargeable and dischargeable device
Implementation Method 3
a rectifying circuit, an input of which is connected to an output of the DC/AC inverter
Implementation Method 4
a capacitor, the two terminals of which are connected to the input of the full-bridge inverter
Implementation Method 5
a boost circuit, an output of which is connected to the input of the full-bridge inverter
Data Source
AI summary
The present invention provides a line interactive UPS, which comprises an AC input, an AC output, a chargeable and dischargeable device, a DC/AC inverter, a rectifying circuit, a full-bridge inverter, a capacitor, a switch, a charger, a boost circuit and a rectifying and buck circuit. An output of the boost circuit is connected to an input of the full-bridge inverter. The rectifying and buck circuit is controlled to provide a rectified output or a rectified and voltage-decreased output. An input of the rectifying and buck circuit is connected to the AC input. The rectifying and buck circuit is operative to provide a pulsating DC to the boost circuit or the full-bridge inverter. The line interactive UPS of the present invention can provide a stable AC to the AC output and has the advantages of small size and low cost.