Operator-Based Nonlinear Control of Calorimetric System Actuated by Peltier Device

Ryo Chikaraishi,Mingcong Deng

doi:10.3390/machines9080174

Abstract

Recently, the development of SiC and GaN high-performance semiconductor devices has led to higher efficiency in power conversion equipment. In order to perform thermal design of power conversion equipment and evaluation of the equipment, it is necessary to measure the power loss of the equipment with high accuracy. In a previous study, a system to measure the power loss from the amount of heat emitted from power conversion devices using a Peltier device was proposed. In this study, aiming to improve the measurement accuracy, the temperature dependence of the thermal conductivity of a Peltier device, which was treated as a constant value in the previous study, was considered. The control system considering the temperature dependence of the thermal conductivity was designed based on operator theory, which is a nonlinear control theory. The simulation and experimental results show that the measurement accuracy was improved when the power loss was 10 W and 15 W compared to the case without considering the temperature dependence. In addition, the measurement time was reduced by about 100 s by considering the temperature dependence. The effectiveness of the proposed system was shown when the power loss was 10 W and 15 W.

Highlights

In recent years, with the development of high-performance semiconductor devices such as SiC and GaN, power conversion devices have become more efficient, and low-loss devices with conversion efficiencies of over 99% have been developed [1]
This problem can be solved by using a calorimetric method to derive the power loss from the amount of heat released from the power conversion device [4]
This section shows and discusses the simulation results and the experimental results to verify the effectiveness of the proposed control system

Summary

Introduction

With the development of high-performance semiconductor devices such as SiC and GaN, power conversion devices have become more efficient, and low-loss devices with conversion efficiencies of over 99% have been developed [1]. Due to the high efficiency of power conversion devices, the ratio of power loss to the measured power becomes very small, which increases the error in the measurement equipment and prevents highly accurate measurement results from being obtained This problem can be solved by using a calorimetric method to derive the power loss from the amount of heat released from the power conversion device [4]. This method measures the amount of heat emitted when the power conversion device (DUT: device under test) to be measured is driven inside a thermostatic chamber through a medium such as air or water This reduces the error in the measurement equipment that occurs when power loss is measured using a power meter. If there is a temperature difference between the internal and ambient temperatures of the thermostatic chamber, heat leakage from the inside of the chamber occurs, and the measurement accuracy decreases

Methods

Results

Conclusion