Resonant converter control strategy with analog and digital circuits

 

The resonant converter adjusts the output by changing the switching frequency. In traditional converters, the output voltage is first compared with a fixed reference voltage through an error amplifier. The output of the error amplifier determines the frequency of the output waveform of the voltage-controlled oscillator (VCO). The VCO controller can be implemented with a combination of digital-analog integrated circuits or a microprocessor. Figure 5.26 shows a push-pull resonant converter VCO controller implemented by a digital-analog circuit. It includes a CD4046 digital phase-locked loop, a CD4013 D flip-flop, a resettable monostable multivibrator CD4528, a 16-bit buffer CD4050 and two AND gates CD4081. CD4046 generates a switching pulse signal vy (t) with a frequency change according to the error voltage vx (t) output by the error amplifier, as shown in Figure 5.27. These pulse signals are connected to the input of CD4013 D-FF and CD4528. CD4013 D-FF generates two anti-phase signals Q and Q (needed to drive the push-pull converter). By adjusting the 5kΩ potentiometer connected to the 2nd foot of CD4528, the pulse width is controlled by CD4528 and CD4011. The CD4050 provides the driving capability to the gate drive circuit, while the fast switching of the power MOSFET is usually realized by the totem pole structure.

Design of Coupled Inductor in Boost Converter for Size Reduction Through Core Type Conversion 부스트 컨버터 내 커플드 인덕터 코어 타입 변경을 통한 사이즈 저감 설계 Jun-Yeol Ryu ․ SuYeon Cho ․ Yangjin Shin ․ Dong Jae Lee ․ Hyun-Soo Seol

 

The Transactions of the Korean Institute of Electrical Engineers KIEE Vol. 74, No. 01, p.76-84 Design of Coupled Inductor in Boost Converter for Size Reduction Through Core Type Conversion 유준열 (Jun-Yeol Ryu) 1iD 조수연 (SuYeon Cho) 1 신양진 (Yangjin Shin) 1 이동재 (Dong Jae Lee) 1 설현수 (Hyun-Soo Seol) †iD 

 Abstract 

One of the most important issues in boost converter design is the minimization of size and the achievement of high power density in the coupled inductor, which is an essential component of the converter. Because the losses in the inductor inevitably increase when the size is reduced, it is necessary to change the core type. When the core type is changed, both the flux distribution and the characteristics of the inductor are also altered, so a method to accurately predict its performance is required. In consideration of these issues, an improved design for coupled inductor was developed. First, the relationship between each part of the inductor and its parameters was analyzed. Then, the appropriate core type was selected based on this investigation. In the improved design aimed at size reduction, the equivalent magnetic circuit (EMC), known for its fast computation, was constructed to reduce the computational time. The electric parameters corresponding to design variables were calculated using the EMC, and then the optimal model was selected. The accurate electric parameters and losses of the designed model were predicted through the finite element analysis. Finally, the experimental validation of the designed model was performed. 

 LINK: http://journal.auric.kr/kiee/XmlViewer/f434642

Multidisciplinary Design Optimization of a UPS Rectifier Using the AI-Aided Design Optimization Technology AI-Aided Design Optimization 기술을 이용한 UPS 정류기의 다분야통합최적설계 Dong-Hoon Choi ․ Dong-Ju Lee

Multidisciplinary Design Optimization of a UPS Rectifier Using the AI-Aided Design Optimization Technology AI-Aided Design Optimization 기술을 이용한 UPS 정류기의 다분야통합최적설계 Dong-Hoon Choi ․ Dong-Ju Lee

 Abstract A multidisciplinary design optimization (MDO) was performed for a rectifier, which is one of key components of uninterruptible power supplies (UPS), using AI-Aided Design Optimization (AADO) technology. First, the design variables and performance indices of the target rectifier were clearly defined to formulate a MDO problem. Then, a multidisciplinary analysis procedure was established using commercial simulation software. Through AADO technology, optimal circuit design variables and heatsink shape parameters were successfully determined, achieving a 36.1% reduction in heatsink volume while satisfying various constraints on circuit performance and temperature.

 DOWNLOAD LINK: http://journal.auric.kr/AURIC_OPEN_temp/RDOC/kiee01/kieet_202504_009.pdf

Online rapid diagnosis method of lithium-ion battery health status based on multi-point impedance Yu Siqi, Mou Xianmin, Chen Xiyou, Fan Xianguo, Yan Wenqian New Technology of Electrical Engineering and Energy. 2025

 Online rapid diagnosis method of lithium-ion battery health status based on multi-point impedance Yu Siqi, Mou Xianmin, Chen Xiyou, Fan Xianguo, Yan Wenqian New Technology of Electrical Engineering and Energy. 2025 

 Abstract With the widespread use of lithium-ion batteries, rapid diagnosis of the health state of lithium-ion batteries has attracted extensive attention. Aiming at the traditional impedance diagnostic methods, which are affected by the change of state of charge (SOC) during online measurement, involving complex calculations, and less impedance information obtained, this paper conducts electrochemical impedance spectroscopy on lithium-ion batteries with different states of charge (SOH) and different states of health (SOH) and establishes a more physically interpretable equivalent circuit model by decoupling the complex dynamics in lithium batteries through the distribution of relaxation time (DRT) method. Based on the dependence of the characteristic peaks of the relaxation time distribution function on the SOC and SOH, three characteristic frequency points are screened for online impedance measurements. A fast online SOH estimation method with multi-point impedance is proposed, which can infer the state of health of the battery based on the characteristic impedance measurement data injected by the superposition of multiple feature frequency points at a time. It is experimentally verified that the method has good accuracy and practicality in online battery characteristic parameter measurement and health state estimation.

VIEW FULL PAPER: https://ateee.iee.ac.cn/CN/10.12067/ATEEE2307009

Review of application on power electronic technology in on-load tap changer SONG Dong-dong1,2, CHENG Lin1, LIN Zhi-fa1, FAN Jing-ming3, DU Hai-jiang1

 Review of application on power electronic technology in on-load tap changer SONG Dong-dong1,2, CHENG Lin1, LIN Zhi-fa1, FAN Jing-ming3, DU Hai-jiang1 

 Abstract Various aspects of the power system operating state of dynamic change will cause voltage fluctuations, so the dynamic voltage control equipment is widely used in the power system. A combination of on-load tap changer (OLTC) and multi-tap transformer is commonly used in the regulating means, also to be the main method of power supply and distribution network in the field of low voltage control. In view of the various defects of the conventional mechanical OLTC, more attention is gradually paid to the power electronics technology. The combination of OLTC with the power electronics technology can be divided into two types: hybrid of mechanical and electrical ones and fully electronic ones. The paper summarizes the ability of arc suppression and operating principles of the new types of OLTC by status analysis of the topology, and also presents the development and key problems of application of power electronics technology in the OLTC. The paper also puts forward a reference for further study of the application of the new OLTC and the best solution for the diversified development of power system.

VIEW FUL PAPER: https://ateee.iee.ac.cn/EN/10.12067/ATEEE1610002