Uninterruptible Power Supply Bypass Power Sharing Control

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Solution Overview

Problem

Conventional uninterruptible power supplies (UPS) face limitations in simultaneous operation of bypass and inverter branches, leading to uncontrollable current issues, limited energy storage, and long switching times, which restrict their loading capacity and efficiency.

Innovation Solution

A UPS design with a bypass power sharing function that uses a current loop to control the output current of both the bypass and inverter branches, allowing them to operate together, with feedback mechanisms to adjust currents and include energy storage batteries for enhanced capacity and efficiency, enabling simultaneous power supply from both branches and efficient energy management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the bypass branch and inverter branch work simultaneously, then the loading capacity is improved, but uncontrollable heavy current between the two branches is caused

Engineering Contradiction:

Improveloading capacityVSAvoiduncontrollable heavy current

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent implements a current sharing control system where the output current of the bypass branch is fed back to the inverter branch through a current transformer and control circuit. This feedback mechanism enables real-time adjustment of the inverter branch current to maintain proper current sharing between the two branches, preventing uncontrollable heavy current while allowing simultaneous operation.

Inventive Principle:

Principle #23Feedback

2Loss of energy

If the inverter branch is completely disconnected when the bypass branch works, then energy consumption is reduced, but the inverter branch cannot store energy for the battery and long switching time is required

Engineering Contradiction:

Improveenergy consumptionVSAvoidswitching time

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The patent enables the inverter branch to remain connected and operational during bypass mode, allowing it to continuously charge the battery and maintain energy storage capability. The current sharing control ensures that the inverter branch draws appropriate current from the bypass source, eliminating the need for complete disconnection and reducing switching time while maintaining energy efficiency.

Inventive Principle:

Principle #20Continuity of useful action

3Device complexity

If the inverter branch is completely disconnected when the bypass branch works, then the UPS structure is simplified, but the overload capability is limited

Engineering Contradiction:

ImproveUPS structureVSAvoidoverload capability

Core Design Contradiction:

Device complexityVSPower

Solution Approach 1:

The patent merges the operational capabilities of the bypass branch and inverter branch by enabling simultaneous operation through current sharing control. This allows the UPS to combine the power output of both branches, significantly increasing overload capability while maintaining a relatively simple structure through the use of a current transformer and control circuit rather than complex additional hardware.

Inventive Principle:

Principle #5Merging (Combining)

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 enhances loading capacity, reduces switching times, and improves battery utilization, while saving power resources by allowing simultaneous operation of bypass and inverter branches and optimizing energy storage and release.

Implementation Method 1

a rectifier, an inverter, and an energy storage battery, wherein one end of the rectifier is connected to the input end

Methodology Applied

Scientific EffectRectification:

Implementation Method 2

one end of the rectifier is connected to the input end, and the other end of the rectifier is connected to one end of the inverter; the other end of the inverter is connected to the output end

Methodology Applied

Scientific EffectInversion:

Implementation Method 3

the energy storage battery is connected to a node between the rectifier and the inverter

Methodology Applied

Scientific EffectBattery energy storage: Battery (electricity)

Implementation Method 4

a current sensor, disposed on the output end and configured to sense an output current of the uninterruptible power supply

Methodology Applied

Scientific EffectCurrent sensing:

Data Source

PatentUS20230179014A1Uninterruptible power supply with bypass power sharing function

Publication Date: 2023.06.08 SANTAK ELECTRONICS SHENZHEN

AI summary

The present invention provides an uninterruptible power supply with bypass power sharing function, including: an input end, configured to be connected to mains; an output end, configured to be connected to a load; a current sensor, disposed at the output end and configured to sense an output current of the uninterruptible power supply; a bypass branch, disposed between the input end and the output end; and an inverter branch, including a rectifier, an inverter and an energy storage battery, wherein one end of the rectifier is connected to the input end, and the other end is connected to one end of the inverter; the other end of the inverter is connected to the output end; and the energy storage battery is connected to a node between the rectifier and the inverter, wherein the uninterruptible power supply is set to be capable of working in a mains mode; and in the mains mode, the inverter branch is controlled with a current loop, so that the bypass branch and the inverter branch together provide the output current of the uninterruptible power supply.