Power Conversion Device With Segmented Switching Circuits

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Solution Overview

Problem

Conventional power conversion devices with bidirectional switch circuits using diodes cannot effectively control the charging of multiple DC voltage sources, leading to issues with power distribution and stopping charging processes.

Innovation Solution

A power conversion device with a transformer having multiple windings and switching circuits, where the turns ratio between windings allows for controlled power distribution and stopping of charging by stepping up or down voltages to manage charge power for each DC voltage source, using switching circuits and an inverter to regulate power flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a bidirectional switch circuit using a diode connected in antiparallel to a switching element is used, then the circuit can handle bidirectional power flow, but the diode rectifies the power in bridge form which prevents control of charge amount to each DC voltage source

Engineering Contradiction:

Improvebidirectional power flow capabilityVSAvoidcontrol of charge amount

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent removes the rectifying diode from the bidirectional switch circuit. By extracting this component that caused unwanted rectification, the circuit maintains bidirectional power flow capability while allowing precise control of charge amount to each DC voltage source through PWM control of the switching element alone.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the circuit configuration by eliminating the diode's rectifying function. This parameter change allows the switching element to independently control power distribution without the diode imposing bridge-form rectification, enabling precise control of charge amount to each DC voltage source.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the same bidirectional switch circuit configuration is used, then the circuit structure is simplified, but it becomes impossible to stop charging for one DC voltage source while continuing to charge another

Engineering Contradiction:

Improvecircuit structureVSAvoidindependent charging control

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent segments the power distribution control by providing separate switching circuits for each DC voltage source. This segmentation allows independent control of charging for each source, enabling stop control for one source while continuing to charge another, while maintaining overall circuit simplicity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic control capability by using independently controllable switching circuits for each DC voltage source. This dynamic configuration allows real-time adjustment of charging status for each source, enabling flexible stop control without increasing overall device complexity.

Inventive Principle:

Principle #15Dynamics

3Extent of automation

If PWM control is attempted through the bidirectional switch circuit with rectifying diode, then power distribution intent can be implemented, but the diode rectification prevents actual control of charge amount

Engineering Contradiction:

ImprovePWM control capabilityVSAvoidcharge amount control precision

Core Design Contradiction:

Extent of automationVSManufacturing precision

Solution Approach 1:

The patent extracts the rectifying diode that was preventing precise charge amount control. By removing this component, PWM control can effectively regulate the charge amount to each DC voltage source without the diode's bridge-form rectification interfering with the control precision.

Inventive Principle:

Principle #2Taking out (Extraction)

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

Enables precise control of power distribution to multiple outputs and arbitrary stopping of charging for each DC voltage source, ensuring efficient power management and supply to loads.

Implementation Method 1

a transformer composed of a first winding, a second winding, a third winding, and a fourth winding which are magnetically coupled with each other

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9787199B2Power conversion device to control power distribution of input power to multiple outputs

Publication Date: 2017.10.10 MITSUBISHI ELECTRIC CORP

AI summary

The power reception amount of input power from an AC power supply is controlled through a first switching circuit. DC voltage is controlled through a second switching circuit, to control charge power for a first DC voltage source. DC voltage obtained by a third switching circuit is converted to AC by an inverter, to supply the resultant power to an AC load. DC voltage is controlled through a fourth switching circuit, to control charge power for a second DC voltage source. Thus, distribution control of the input power is performed. In addition, in the distribution control of the input power, operation of the second switching circuit or the fourth switching circuit is stopped to allow stop of the charging for the first DC voltage source or the second DC voltage source.