Printed circuit board planar current transformer for GaN active diode

Ho, Godwin Kwun Yuan; Fang, Yaoran; Pong, M.H.; Hui, S. Y. Ron

doi:10.1109/apec.2017.7931056

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…The secondary synchronous rectifier takes shorter time to turn on within (1 − δ)T interval, and the current provided by the magnetic energy flow into battery after snubber capacitance was fully charged. According to (7), the rectifier takes about 23 ns which fits the simulation. Additionally, the snubber charging time and the battery charging time derived in ( 16) and ( 21) were compared in Table 9.…”

Section: Spice Simulation Of the D-mode Gan Hemt Synchronous Rectifiermentioning

confidence: 70%

“…Equation (7) states that the diode turn-on time decreases as the input current increases. According to Table 1, if the current of the primary winding is i p (0) = 1 A, then the diode turn-on time is 23 ns.…”

Section: Diode Turn-on Period Of Time T Drisementioning

confidence: 99%

“…For pursuing high efficiency, the use of flyback converters with high-efficiency GaN transistors are reported and the efficiency improvement has been verified in some works [5,6]. Moreover, synchronous rectification using GaN to replace the output diode has low conduction loss and show better performance [7].…”

Section: Introductionmentioning

confidence: 99%

“…Taking synchronous rectifier method into consideration is normally used to obtain higher power conversion efficiency. Especially, using GaN transistors as synchronous rectifier to replace the Schottky diode showing a great performance in reducing loss [7]. However, several challenges, like, as blocking the current flowing to the battery during the inductor charging period, and self-sustainable on the secondary side when the battery is on low voltage or even empty, need to be concerned with in the battery charging system.…”

Section: Introductionmentioning

confidence: 99%

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Flyback Converter Using a D-Mode GaN HEMT Synchronous Rectifier

Shieh

Liu

et al. 2022

Energies

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The flyback converter with its active cell balancing topology for charging lithium-based batteries in Electrical Vehicles (EV) have been adopted recently into the industry. Electrical Vehicle battery charging requires high current operation in continuous current mode and hence, the power loss on the Schottky diode rectifier on the secondary side determines the power conversion efficiency. The depletion mode (D-mode) GaN HEMT synchronous rectifier proposed in this paper has been used to replace the Schottky diode on the secondary side of the flyback converter in order to improve the power conversion efficiency. This synchronous rectifier regulates the forward voltage drop of an external switch to about 100 mV per ampere of current flow with no concern to threshold voltage. The first challenge of converting the D-mode GaN HEMT as a synchronous rectifier is that the normally-on device must be off when the primary side inductor of the flyback converter is initially charging the magnetic energy. That is, the rectifier must behave as the normally-off device during its initialization stage. The second challenge is that the D-mode GaN HEMT must switch off as soon as the secondary current becomes zero. The third challenge is posing a fast recovery feature to reduce the drain-source voltage rise on the primary side switch, which suffices to be the main reason as to why the D-mode GaN HEMT is used instead of MOS devices. The proposed depletion mode GaN HEMT synchronous rectifier is verified to be able to overcome all challenges and in result becomes a candidate for the synchronous rectifier.

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Section: Spice Simulation Of the D-mode Gan Hemt Synchronous Rectifiermentioning

confidence: 70%

Section: Diode Turn-on Period Of Time T Drisementioning

confidence: 99%