Design of rectifier diode temperature compensation circuit in flyback converter

Shi, Lei; Chang, Yuhua; He, Huisen; Nie, H. Y.; Zhao, Yingbo

doi:10.1049/iet-cds.2011.0254

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…In this design, the short-circuit operating frequency is 115 Fig. 6 Architecture and timing diagram of the OSC module kHz, which is about 31% of the maximum value of 370 kHz and satisfies the frequency requirement shown in (17). Therefore the inductor current is under control and the performance of short-circuit protection is improved.…”

Section: Frequency-variable Controlmentioning

confidence: 88%

“…Hence, the required short-circuit operating period and www.ietdl.org frequency can be given by (17) According to (17), the required short-circuit operating frequency is proportional to the voltage drop V DS and reverse proportional to the input voltage V IN and propagation delay t D . The needed short-circuit frequency is usually lower than the normal value, especially when the converter operates at a very high switching frequency in order to use small-value off-chip inductors [25][26][27][28]o re v e n on-chip inductor [29], a frequency-variable method is required to reduce the operating frequency in the short-circuit condition.…”

Section: Frequency-variable Controlmentioning

confidence: 99%

“…Thus, power dissipation in short‐circuit status is much larger than that in normal operation. Moreover, if the fault condition persists, junction temperature of the converters increases gradually and excessive heat may finally destroy the converters without thermal‐overload protection [17]. In [18], when a short is detected, the converter is latched off immediately and the power consumption is reduced.…”

Section: Introductionmentioning

confidence: 99%

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Novel short‐circuit protection technique for DC–DC buck converters

Lai

et al. 2014

IET Circuits, Devices & Systems

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This study presents a novel short-circuit protection technique for DC-DC buck converters. The required short-circuit operating frequency is derived in order to avoid the effect of inherent propagation delay in the controller and power transistors. In this design, the short-circuit switching frequency is approximately 31% of the normal value. Simultaneously, the peak current limit is decreased to about 40% of the normal value to lower the power dissipation when a short-circuit event occurs. Once the fault condition is removed, the converters can automatically return to normal operation smoothly by clamping the soft-start signal using the feedback voltage of the output. A buck converter with the proposed technique has been successfully simulated and verified by a 0.6-μm CDMOS technology. The simulation results show that the power loss is only 17.1% of the constant current limit during the prolonged short-circuit situation, which significantly enhances the reliability of the chip. Furthermore, the converter is able to achieve smooth self-recovery as soon as the fault status is released.

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Section: Frequency-variable Controlmentioning

confidence: 88%