Synchronous rectification circuit using a current transformer

Kubota, Yohei; Nishimura, Koki; Kobayashi, K.

doi:10.1109/intlec.2000.884260

Cited by 15 publications

(4 citation statements)

References 2 publications

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“…By using current transformer Figure 17 shows a current transformer (CT) [4] serving as the driving circuit of flywheeling switch. When the flywheeling current through CT is close to zero, the CT can not provide sufficient voltage to drive MOSFET.…”

Section: Solutions For the Reverse Current Phenomenonmentioning

confidence: 99%

Study on the Reverse Conduction of Synchronous Rectifiers

Jinno

Chen

Shie

2006

TENCON 2006 - 2006 IEEE Region 10 Conference

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A study on the reverse current phenomenon in synchronous rectifiers is presented in this paper. For loss reduction, the synchronous rectifiers composed of MOSFETs have recently been employed to replace the conventional rectifiers with diodes in low voltage and high current applications. Because the MOSFETs in the synchronous rectifiers are used as bidirectional switches, reverse current flow will probably occur. The reverse current phenomenon will cause undesired loss. To clarify the effects of reverse current on the forward converter with synchronous rectifier, both the experiment and the analysis are performed in this research.

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Section: Solutions For the Reverse Current Phenomenonmentioning

confidence: 99%

Study on the Reverse Conduction of Synchronous Rectifiers

Jinno

Chen

Shie

2006

TENCON 2006 - 2006 IEEE Region 10 Conference

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“…Therefore, identity of each topology does not resemble the weakness of the design but it can encourage researchers to improve and redesign new converter based on the basic topology. Recent development in SDSR topologies [1][2][3][4][5][6][7][8][9][10] obviously implementing N-Channel MOSFETs for the power switches and the synchronous rectification (SR) switches. Besides, isolated topologies with symmetrical transformer characteristic such as half-bridge, full-bridge and push-pull are also the preferred choice for the SDSR topology.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2017

International Journal of Innovative Research in Electrical, Ele

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This paper presents an optimized and enhanced DC-DC converter design for 20V output for portable instrument application. The proposed design is based on isolated push pull topology switched mode power supply. Selfdriven synchronous rectification (SDSR) is introduced in the rectification stage in order to create an improved way of rectifying process. N-Channel and P-Channel MOSFETs are used to simplify the synchronous rectification control circuit. Both MOSFETs offer ultra low On-resistance which can be used to achieve higher efficiency than the conventional converter. This converter operates at high speed switching frequency to gain high power-to-volume ratio. In addition, minimum deadtime is set in the design to ensure high efficiency in input-output power transfer. Passive low pass filter is implemented to produce ripple free output voltage in the design. The finalize topology which is push pull with self-driven synchronous rectification is constructed using simple control circuit but maintains good efficiency in its operation. Experimental results show that the proposed converter reacts very well with the self-driven synchronous rectification method. Input voltage is set at 12V and switching frequency is set at 30 kHz in order to minimize the switching stress and conduction losses. Practical implementation of the converter shows that the converter operates at a maximum efficiency of 84.1% and only produces 50mVp-p ripple output voltage which is considered good for a regulated DC output.

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“…In the external-driven SR scheme, the control signal of the secondary side switch is generated in the primary side and transferred to the secondary side by an additional transformer, increasing the implementation cost [9], [10]. In the self-driven SR (SDSR) scheme, the control signal of the secondary side switch is generated by itself, which can be realized by either current-mode or voltage-mode control Manuscript scheme [11]- [20]. In the current-mode SDSR shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In the current-mode SDSR shown in Fig. 1(a), the current of the secondary side is sensed by an additional current detecting transformer, which may increase the system cost and degrade the efficiency due to the loss of the additional transformer [11]- [13]. In the voltage-mode SDSR, the switching control signal is generated based on the drain-to-source voltage of the switching transistor as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

A CCM/DCM Dual-Mode Synchronous Rectification Controller for a High-Efficiency Flyback Converter

Park

Roh

Moon

et al. 2014

IEEE Trans. Power Electron.

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A dual-mode synchronous rectification (SR) controller supporting both the continuous-conduction mode and discontinuous-conduction mode is developed to improve the power efficiency of a flyback converter. The dual-mode SR controller ensures nonoverlapped turning-on of the primary and secondary switches by monitoring the voltage level of the secondary switch. The dual-mode SR controller requiring four pins and only one external resistor has been implemented in a 0.35-μm BCDMOS process and applied to a 50-W flyback converter. The efficiency of the flyback converter is improved by upto 6.8% when the dualmode SR controller is employed compared to the one employing the conventional SR controller.

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Synchronous rectification circuit using a current transformer

Cited by 15 publications

References 2 publications

Study on the Reverse Conduction of Synchronous Rectifiers

Study on the Reverse Conduction of Synchronous Rectifiers

Untitled

A CCM/DCM Dual-Mode Synchronous Rectification Controller for a High-Efficiency Flyback Converter

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