Vehicle Emergency Power Supply Voltage Stabilization

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Solution Overview

Problem

Conventional in-vehicle emergency power supply devices face challenges in stabilizing output voltage and extending the lifetime of power storage units due to deterioration of electric double-layer capacitors, leading to reduced storage capacity and unstable power supply.

Innovation Solution

The in-vehicle emergency power supply device incorporates a charging circuit that adjusts the full charging voltage based on the deterioration of electric double-layer capacitors, using a correction charging voltage lower than the set full charging voltage to slow down the deterioration process, thereby stabilizing output voltage and extending the device's and power storage unit's lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If charging is performed to full charging voltage, then power storage capacity is maximized, but power storage unit lifetime deteriorates faster

Engineering Contradiction:

Improvepower storage capacityVSAvoidpower storage unit lifetime

Core Design Contradiction:

Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the charging voltage threshold based on the deterioration state of the electric double-layer capacitor. As the capacitor deteriorates, the charging voltage is reduced from the initial full charging voltage to a lower threshold voltage, preventing further degradation while maintaining adequate power storage capacity for emergency supply functions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The charging control system transitions from a static full charging approach to a dynamic charging strategy that adapts to the capacitor's aging state. The controller continuously monitors capacitance values and adjusts the charging voltage threshold accordingly, enabling the system to optimize between power storage capacity and component lifetime extension over time.

Inventive Principle:

Principle #15Dynamics

2Duration of action of stationary object

If charging voltage is reduced to extend lifetime, then power storage unit deteriorates slower, but power storage capacity decreases

Engineering Contradiction:

Improvepower storage unit lifetimeVSAvoidpower storage capacity

Core Design Contradiction:

Duration of action of stationary objectVSQuantity of substance

Solution Approach 1:

The patent implements partial charging action by charging the electric double-layer capacitor only to a threshold voltage level rather than full charging voltage. This partial charging approach is sufficient to maintain adequate emergency power supply capacity while significantly reducing stress on the capacitor and extending its operational lifetime.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system performs preliminary assessment of the capacitor's deterioration state by measuring capacitance values before determining the appropriate charging voltage threshold. This preliminary action enables proactive adjustment of charging parameters to prevent further degradation while maintaining adequate power storage capacity.

Inventive Principle:

Principle #10Preliminary action

3Speed

If conventional charging control is used, then charging speed is fast, but output voltage becomes unstable due to capacitor deterioration

Engineering Contradiction:

Improvecharging speedVSAvoidoutput voltage stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent implements feedback control by continuously monitoring the capacitance value of the electric double-layer capacitor and using this information to adjust the charging voltage threshold. This feedback mechanism ensures that charging parameters are optimized based on the actual state of the capacitor, maintaining both charging efficiency and output voltage stability throughout the capacitor's operational life.

Inventive Principle:

Principle #23Feedback

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 configuration effectively stabilizes the output voltage over a long period, suppresses the deterioration of power storage units, and extends their lifetime by charging to a correction charging voltage lower than the set full charging voltage, ensuring consistent power supply even during vehicle and battery abnormalities.

Implementation Method 1

a power storage unit 10 including an electric double-layer capacitor 9

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

discharging circuit 12 that discharges the power storage unit 10

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentEP3576250B1Vehicle-mounted emergency power supply device

Publication Date: 2021.12.22 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

An in-vehicle emergency power supply device includes a power storage unit including an electric double-layer capacitor, a charging circuit charging the power storage unit, a discharging circuit discharging the power storage unit, and a controller controlling the charging circuit and the discharging circuit. When the charging circuit charges the power storage unit, the controller determines a set full charging voltage of the power storage unit, determines a correction charging voltage lower than the set full charging voltage based on the set full charging voltage, and controls the charging circuit to charge the power storage unit until a stored voltage reaches the correction charging voltage. This in-vehicle emergency power supply device stabilizes an output voltage thereof.