Non-reciprocal Circuit Device Heat Dissipation via Segmentation

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Solution Overview

Problem

Non-reciprocal circuit devices, such as isolators, face issues with heat generation at the terminating resistor, leading to deteriorated electrical characteristics and potential burnout due to inadequate heat dissipation, which limits their power handling capability and size reduction.

Innovation Solution

Incorporating a permanent magnet and ferrite structure with a first central electrode and a second central electrode, where the power consumption is distributed between the terminating resistor and the first central electrode when signals flow in reverse direction, effectively dispersing heat and reducing temperature increase at the terminating resistor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminating resistor is used to dissipate reverse direction signals, then the isolation characteristic is improved, but the heat generation at the terminating resistor increases causing temperature rise and potential burnout

Engineering Contradiction:

Improveisolation characteristicVSAvoidtemperature at terminating resistor

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent divides the power dissipation function between two components: the terminating resistor and the first central electrode. The first central electrode is designed with specific resistance characteristics to consume a portion of the reverse direction signal power, thereby segmenting the heat generation burden and reducing the temperature rise at the terminating resistor while maintaining the isolation characteristic.

Inventive Principle:

Principle #1Segmentation

2Temperature

If a larger terminating resistor is used to improve heat radiation, then the temperature control is improved, but the device size increases

Engineering Contradiction:

Improvetemperature controlVSAvoiddevice size

Core Design Contradiction:

TemperatureVSVolume of moving object

Solution Approach 1:

By segmenting the power dissipation function between the first central electrode and the terminating resistor, the patent reduces the power burden on the terminating resistor. This allows the use of a smaller terminating resistor with adequate heat radiation capability, thereby controlling the temperature without increasing the overall device size.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the power consumption at the terminating resistor is increased to improve isolation, then the isolation characteristic is improved, but the heat generation increases causing deterioration of electrical characteristics

Engineering Contradiction:

Improveisolation characteristicVSAvoidheat generation

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent segments the power consumption function by designing the first central electrode with specific resistance characteristics (real part between 10Ω and 100Ω) to consume a portion of the reverse direction signal power. This segmentation reduces the heat generation at the terminating resistor while maintaining adequate isolation characteristics through the combined effect of both components.

Inventive Principle:

Principle #1Segmentation

4Volume of moving object

If the terminating resistor is made smaller to reduce device size, then the device size is reduced, but the heat radiation ability deteriorates causing temperature increase

Engineering Contradiction:

Improvedevice sizeVSAvoidheat radiation ability

Core Design Contradiction:

Volume of moving objectVSTemperature

Solution Approach 1:

By segmenting the power dissipation function between the first central electrode and the terminating resistor, the patent enables the use of a smaller terminating resistor. The first central electrode compensates for the reduced heat radiation ability of the smaller terminating resistor by consuming a portion of the power, thereby maintaining temperature control in a compact device configuration.

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

This approach reduces heat generation at the terminating resistor, improves withstand voltage characteristics, prevents burnout, allows for a smaller terminating resistor and device size, and maintains preferable electrical characteristics by dispersing power consumption, thereby enhancing heat radiation and isolation performance.

Implementation Method 1

a permanent magnet, a ferrite arranged to receive a direct-current magnetic field from the permanent magnet

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

High frequency signals traveling in a reverse direction generate heat that is dissipated at the terminating resistor

Methodology Applied

Scientific EffectMagnetic loss: Magnetic Hysteresis

Implementation Method 3

power consumed at the first central electrode is greater than power consumed at the terminating resistor

Methodology Applied

Scientific EffectResistive heating: Joule Heating

Data Source

PatentUS8102220B2Non-reciprocal circuit device

Publication Date: 2012.01.24 MURATA MFG CO LTD

AI summary

A non-reciprocal circuit device includes a ferrite arranged to receive a direct-current magnetic field from a permanent magnet, a first central electrode and a second central electrode arranged on the ferrite. The non-reciprocal circuit device further includes matching capacitors and a terminating resistor. When high frequency signals flow in a reverse direction, power consumption at the first central electrode is increased by decreasing an equivalent parallel resistance Rp of the first central electrode, in relation to power consumption at the terminating resistor.