Control Design and Realization of a Fast Transient Response, High-Reliability DC-DC Converter With a Secondary- Side Control Circuit

Ma, Cong; Wang, Kai; Wang, Junfeng

doi:10.1109/access.2021.3063157

Cited by 6 publications

(5 citation statements)

References 20 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Derating designs constitute a key factor in component selection for lowering the failure rate. When performing derating, it is necessary to keep the maximum stress at a proportion of the maximum ratings—this is called the derating factor [ 5 , 6 , 7 ]. If we act in voltage, derating means that the actual capacitor shall be used in the application at a lower voltage than the rated voltage.…”

Section: Introductionmentioning

confidence: 99%

A Derating-Sensitive Tantalum Polymer Capacitor’s Failure Rate within a DC-DC eGaN-FET-Based PoL Converter Workbench Study

Butnicu

2023

Micromachines

View full text Add to dashboard Cite

Many recent studies have revealed that PoL (Point of Load) converters’ output capacitors are a paramount component from a reliability point of view. To receive the maximum degree of reliability in many applications, designers are often advised to derate this capacitor—as such, a careful comprehending of it is required to determine the converter’s overall parameters. PoL converters are commonly found in many electronic systems. Their most important requirements are a stable output voltage with load current variation, good temperature stability, low output ripple voltage, and high efficiency and reliability. If the electronic system in question must be portable, a small footprint and volume are also important considerations—both of which have recently been well accomplished in eGaN transistor technologies. This paper provides details on how derating an output capacitor—specifically, a conductive tantalum polymer surface-mount chip, as this type of capacitor represented a step forward in miniaturization and reliability over previously existing wet electrolytic capacitors—used within a discrete eGaN-FET-based PoL buck converter determines the best performance and the highest MTBF. A setup based on an EPC eGaN FET transistor enclosed in a 9059/30 V evaluation board with a 12 V input voltage/1.2 V output voltage was tested in order to achieve the study’s main scope. Typical electrical performance and reliability data are often provided for customers by manufacturers through technical papers; this kind of public data is often selected to show the capacitors in a favorable light—still, they provide much useful information. In this paper, the capacitor derating process was presented to give a basic overview of the reliability performance characteristics of tantalum polymer capacitor when used within a DC–DC buck converter’s output filter. Performing calculations of the capacitor’s failure rate based on taking a thermal scan of the capacitor’s capsule surface temperature, the behavior of the PoL converter was evaluated.

show abstract

Section: Introductionmentioning

confidence: 99%

A Derating-Sensitive Tantalum Polymer Capacitor’s Failure Rate within a DC-DC eGaN-FET-Based PoL Converter Workbench Study

Butnicu

2023

Micromachines

View full text Add to dashboard Cite

show abstract

“…But the precision of PSS will be compromised by parasitic resistance and the voltage drop brought on by leakage inductance [11]. In [12,13,14,15], a magnetic isolation circuit is applied in place of an optocoupler, output of the error amplifier or control signal can be sent to the controller through the microtransformer integrated on chip, which offers an opportunity to reduce the volume of the system. However, as reported in [16], compared with the capacitor-coupled isolator, the inductor-coupled isolator is more sensitive to external electromagnetic interference and less cost effective.…”

Section: Introductionmentioning

confidence: 99%

A high-efficiency active clamped flyback AC-DC converter using an integrated digital isolator in isolated communication

Yang,

He,

Jiang

et al. 2023

IEICE Electron. Express

View full text Add to dashboard Cite

This paper presents a 45w (20V, 2.25A) output active clamped flyback (ACF) AC-DC controller using a capacitor-coupled integrated digital isolator in isolated communication in place of a bulky optocoupler, which not only helps to reduce system volume but also improves the reliability of the ACF converter. In contrast with the conventional ACF, the controller in this paper features a delicate adaptive zero voltage switching (ZVS) control to reduce conduction and switching losses so as to improve the power efficiency. Designed in a 0.18-μm isolated BCD process, the simulation result shows the proposed ACF converter approached 95.1% maximum efficiency when GaN power transistors are used as power switches. The feasibility of the proposed digital isolator is also verified and exhibits high transmission accuracy with low propagation delay.

show abstract

“…Applications such as home appliances, micro‐grids, electric vehicles, battery systems, and renewable energy sources widely utilize isolated dc‐dc converters 1 . Galvanic isolation, high efficiency, simple control approach, and low cost have made isolated current‐fed push‐pull converters popular among other converters 2,3 . Furthermore, converters with bidirectional power flow capabilities are becoming popular in microgrid systems 4 …”

Section: Introductionmentioning

confidence: 99%

“…The current mode control has also been shown to eliminate the flux symmetry problem associated with isolated topologies 9 . As comparison of a number of newest peak current mode control methods, references 3,10,11 are studied. In Ko et al, 10 hybrid current mode control for a phase‐shifted full‐bridge converter is presented, but the effect of sub‐harmonic oscillation on the controller performance and mitigating its effect has not been studied.…”

Section: Introductionmentioning

confidence: 99%

“…In Ko et al, 10 hybrid current mode control for a phase‐shifted full‐bridge converter is presented, but the effect of sub‐harmonic oscillation on the controller performance and mitigating its effect has not been studied. In Ma et al, 3 secondary‐side peak current mode control on isolated buck forward converter is studied; however, duty cycle greater than 0.5 and its effect on converter stability are not considered. In al Aroudi et al, 11 peak current mode control with auto‐tuned slope compensation is applied to a simple boost converter; however, the controller is implemented in analog form, and the amplitude of slope is obtained using instantaneous inductor current, which is difficult to implement it in digital form.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Digital peak current mode control of isolated current‐fed push‐pull DC‐DC converter with slope compensation

Ghalebani

Teymoori

2021

Circuit Theory & Apps

View full text Add to dashboard Cite

The isolated current‐fed push‐pull dc‐dc converter has some practical advantages such as improved cross regulation characteristics, reduced output noise, and good overall efficiency. Although detailed insight on this converter is available in the literature, the use of digital peak current mode with slope compensation control methodology has not been explicitly presented. This paper discusses digital peak current mode control of a current‐fed push‐pull converter with a novel double digital pulse‐by‐pulse current limiting scheme. Push‐pull topology is implemented on the primary side of an isolation transformer in a dc‐dc bidirectional converter. Achieving this control solution of isolated push‐pull converter is attractive especially in controlling battery power flow in smart micro‐grids. By using a digitally controlled push‐pull converter, the ability to change controller parameters and the use of droop control methods for storage are easier. Furthermore, current mode control provides capability of equal current sharing between parallel converters and eliminates the transformer saturation problem that is common in push‐pull topology. Using continuous time model of the converter, a Type II compensator is designed and implemented in discrete time domain. Digital slope compensation is applied to eliminate the high frequency oscillations caused by current feedback loop. The control method and slope compensation are implemented on STM32F303 mixed‐signal microcontroller. On‐chip analog comparator disabled the PWM output if the sensed current exceeds the reference current until next PWM cycle. The digital controller performance is confirmed by 13 W hardware implementation including fast transient response and stable operation.

show abstract

Control Design and Realization of a Fast Transient Response, High-Reliability DC-DC Converter With a Secondary- Side Control Circuit

Cited by 6 publications

References 20 publications

A Derating-Sensitive Tantalum Polymer Capacitor’s Failure Rate within a DC-DC eGaN-FET-Based PoL Converter Workbench Study

A Derating-Sensitive Tantalum Polymer Capacitor’s Failure Rate within a DC-DC eGaN-FET-Based PoL Converter Workbench Study

A high-efficiency active clamped flyback AC-DC converter using an integrated digital isolator in isolated communication

Digital peak current mode control of isolated current‐fed push‐pull DC‐DC converter with slope compensation

Contact Info

Product

Resources

About