Uninterruptible Power Supply Dual Primary Winding Isolation

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Solution Overview

Problem

Conventional uninterruptible power supplies (UPS) face challenges in providing isolated and uninterrupted power due to voltage interruptions and distortion during mode transitions, as well as inefficiencies in power conversion and regulation.

Innovation Solution

A double primary winding configuration in an isolation transformer allows for continuous mode switching without interruption, with independent voltage control for each mode and a compensation circuit to maintain output voltage stability based on load conditions, ensuring isolated and regulated power delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single primary winding is used in the transformer, then the device complexity is reduced, but voltage interruptions occur during mode switching between online inverter and bypass modes

Engineering Contradiction:

Improvetransformer winding configurationVSAvoidpower continuity during mode switching

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The primary winding is segmented into two separate windings: a first primary winding for online inverter mode and a second primary winding for bypass mode. This segmentation allows independent connection of each winding to its respective mode, enabling seamless switching without voltage interruption by simply changing which winding is connected to the load.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If bypass power is connected directly to the output, then the ease of operation is improved, but power spikes are transferred to the output side causing harmful effects

Engineering Contradiction:

Improvebypass circuit configurationVSAvoidpower spikes at output

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The second primary winding acts as an intermediary between the bypass power source and the output. By connecting bypass power through this intermediate winding rather than directly to the output, the transformer provides isolation that blocks power spikes and disturbances from reaching the load while still enabling direct bypass operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If the same primary winding is used for both online inverter and bypass modes, then the device complexity is reduced, but the adaptability to different mode requirements is limited

Engineering Contradiction:

Improvewinding configurationVSAvoidvoltage control for different modes

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The primary winding is divided into two separate windings that can be independently optimized for their respective modes. The first primary winding is optimized for online inverter mode with appropriate turns ratio and impedance, while the second primary winding is optimized for bypass mode characteristics, allowing each mode to operate with ideal parameters.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each primary winding is designed with specific local characteristics suited to its intended mode of operation. The first primary winding has properties optimized for inverter-fed power, while the second primary winding has properties optimized for direct bypass power, enabling optimal performance in each mode without compromise.

Inventive Principle:

Principle #3Local quality

4Manufacturing precision

If a single primary winding is used, then the manufacturing precision requirements are reduced, but voltage regulation during mode transitions cannot be maintained

Engineering Contradiction:

Improvewinding specificationVSAvoidvoltage regulation during switching

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

By segmenting the primary winding into two separate windings with distinct specifications, each winding can be manufactured and tuned to precise requirements for its specific mode without compromising the other mode's performance, ensuring continuous voltage regulation during transitions.

Inventive Principle:

Principle #1Segmentation

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 enables seamless transitions between online inverter and bypass modes without power lapses, maintaining isolated and regulated output voltage, even under varying load conditions, thus providing reliable and efficient uninterrupted power supply.

Implementation Method 1

an isolation transformer having dual primary windings and a secondary winding to supply an output voltage

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS8036004B2Uninterruptible power supply with total isolation

Publication Date: 2011.10.11 TOSHIBA INTERNATIONAL CORP

AI summary

An uninterruptible power supply includes an isolation transformer having dual primary windings. The secondary winding generates an output voltage based on the magnetic field generated in one of the dual primary windings. A first primary winding is coupled to an inverter circuit that receives an alternating current input voltage and applies a clean and filter alternating current to the first primary winding. A second primary winding is coupled to a bypass circuit that applies a bypass voltage when the inverter circuit is in a failure state. The power supply also includes a compensation circuit to maintain the output voltage at a desired level.