Akademik Veri Yönetim Sistemi
7. Bilsel international efes scientific researches and innovation congress, İzmir, Türkiye, 14 - 15 Haziran 2025, ss.143, (Özet Bildiri)
In recent years, with the continuous rapid
development of science and technology, great progress has been made in the
field of consumer electronics. The portability of electronic products is a very
important requirement for the application areas of new technologies. The market
also has higher requirements for the power management system, which is the main
component of portable equipment. Therefore, power management chips bring new
challenges in work efficiency and integration. In portable electronic devices
such as mobile phones or multimedia entertainment equipment, LDO (Low Drop-Out)
regulators that show low voltage drop or ripple are an important component for
the power supply. Linear power converters generally use a transformer at the
input to convert an AC signal to DC, a bridge rectifier consisting of diodes,
and a capacitor used to filter the signal.
Linear DC-DC converters, which use the obtained DC input voltage or a direct DC input voltage as in the automotive sector, convert the voltage to a stable output voltage at the desired value with a linear operating mode using a voltage regulator or a series transition transistor. As seen in the figure, linear converters convert the input AC voltage to a lower level, rectify it to DC and regulate the voltage in a linear mode with heat dissipation. They have low (approximately 60%) efficiency because they constantly dissipate power in the form of heat. Due to the lower efficiency, more heat requires heat sinks to dissipate this energy. Since they need heat sinks, they are larger and heavier. In contrast, they are simpler in design and production and potentially more cost-effective. They produce cleaner output with less noise and ripple, and are preferred in sensitive audio and analog applications. They are preferred in applications requiring less sensitivity to minimum noise, size and efficiency. In this study, a linear DC-DC converter structure is examined in terms of its advantages and disadvantages. In the study, thermal problems existing in linear converters are revealed by using Siemens FloEFD software, thermal analyzes of the designed circuits and the minimum dimensions required for the healthy operation of the relevant circuits are obtained in the light of the analyzes. In addition, the circuit is subjected to conduction electromagnetic emission tests and the electromagnetic compatibility characteristics of a linear converter are examined.