Boost Converter Controller Dynamic Temperature Reference

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Solution Overview

Problem

Existing driving systems with boost converters face performance deterioration due to inadequate protection of reactors and capacitors at low ambient temperatures, as they uniformly set a low temperature reference value, leading to excessive limitation of input current and insufficient protection for capacitors.

Innovation Solution

A driving system that dynamically adjusts the temperature reference value based on ambient temperature, setting a first temperature when it's high and a second, higher temperature when ambient temperature is low, to control the input current of the boost converter and protect the reactor and capacitor without direct temperature sensing of the capacitor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a uniformly low temperature reference value is set to protect the reactor, then the reactor is protected from overheating, but the input current is excessively limited at low ambient temperatures causing performance deterioration of the boost converter

Engineering Contradiction:

Improvereactor protectionVSAvoidboost converter performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The temperature reference value is made dynamic by adjusting it according to ambient temperature. When ambient temperature is low, a higher temperature reference value is set, allowing greater input current. When ambient temperature is high, a lower temperature reference value is set, providing stricter protection. This dynamic adjustment resolves the contradiction between reactor protection and boost converter performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The temperature reference value parameter is changed based on ambient temperature conditions. The control device sets different temperature reference values (first temperature reference value for high ambient temperature, second temperature reference value for low ambient temperature) to optimize both reactor protection and system performance under different operating conditions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a low temperature reference value is set to ensure capacitor protection, then the capacitor is protected from overheating, but the input current is limited in a way that does not fully utilize the available capacity at low ambient temperatures

Engineering Contradiction:

Improvecapacitor protectionVSAvoidavailable capacity utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The temperature reference value is dynamically adjusted based on ambient temperature to optimize capacitor protection while maximizing available capacity utilization. At low ambient temperatures, a higher reference value allows greater current flow, fully utilizing the capacitor's available capacity. At high ambient temperatures, a lower reference value ensures adequate protection.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The temperature reference value parameter is modified according to ambient temperature conditions to balance capacitor protection and capacity utilization. The control device selects between different temperature reference values to ensure the capacitor operates within safe temperature limits while maximizing system performance.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the temperature reference value is set without considering ambient temperature, then the control logic is simple, but the system cannot adapt to different ambient temperature conditions causing performance deterioration

Engineering Contradiction:

Improvecontrol logic complexityVSAvoidambient temperature adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The temperature reference value is made dynamic and adaptive to ambient temperature conditions. The control device incorporates ambient temperature sensing and automatically adjusts the temperature reference value accordingly, enabling the system to adapt to different operating environments without requiring complex manual configuration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The temperature reference value parameter is changed based on ambient temperature measurements. The control device selects appropriate temperature reference values from predetermined sets based on ambient temperature ranges, providing adaptability to different environmental conditions while maintaining relatively simple control logic through predefined parameter sets.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11228236B2Boost converter controller

Publication Date: 2022.01.18 DENSO CORP

AI summary

There is provided a driving system configured to control an input current of a boost converter when temperature of a reactor becomes higher than a temperature reference value that is lower than a heatproof temperature of the reactor, compared with the input current when the temperature of the reactor is equal to or lower than the temperature reference value. A first temperature is set to the temperature reference value when ambient temperature is equal to or higher than a predetermined temperature. A second temperature that is higher than the first temperature is set to the temperature reference value when the ambient temperature is lower than the predetermined temperature.