A novel synchronous rectification circuit using a saturable current transformer

Kuwabara, Kouhei; Matsuo, Hirofumi; Kobayashi, K.; Nishimura, Koki

doi:10.1109/psec.2002.1023860

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…The control-driven method develops driving signal by monitoring the SR current [17][18][19][20][21][22][23][24][25][26][27][28]. Depending on how the current is monitored, this technique divides into currentdriven and voltage-driven methods.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on how the current is monitored, this technique divides into currentdriven and voltage-driven methods. In the current-driven method, the current transformer (CT) is placed in series with www.ietdl.org MOSFET to sense the SR current [18][19][20][21][22][23][24][25][26]. However, CT has a large size and its winding adds resistance to the current path.…”

Section: Introductionmentioning

confidence: 99%

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Synchronous rectifier driving circuit based on voltage‐driven method with energy recovery

Asghari¹,

Farzanehfard²

2014

IET Power Electronics

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A new synchronous rectifier (SR) gate drive circuit is presented in this study. The proposed SR driver generates the driving signal according to the SR voltage polarity without using any external control signal. Also, it can turn off the SR with delay and keeps the SR on after its drain source voltage becomes positive. In addition, this driver recovers part of the driving energy in a resonant manner. The proposed SR driving circuit is suitable for some zero voltage transition (ZVT) synchronous buck converters. It can also be used for some high-frequency resonant converters and high-frequency discontinuous conduction mode pulse-width modulation circuits. In this study, the proposed driver is applied to a ZVT synchronous buck converter and the presented experimental results confirm the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synchronous rectifier driving circuit based on voltage‐driven method with energy recovery

Asghari¹,

Farzanehfard²

2014

IET Power Electronics

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“…It is noted that an addition of a digital controller may cause a problem of programmed delays. In the SD methods, the gate signals can be obtained from the current driven-method [3][4] and voltage driven method [5][6][7]. However, the current-driven method generates the driving signal through the CT, this approach is more complex than the voltage driven method.…”

Section: Introductionmentioning

confidence: 99%

An improved self-driven synchronous rectifier for high efficiency dimmable LED lighting applications

Mujjalinvimut

Ayudhya

Sangswang

2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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This paper presents an asymmetrical half bridge (AHB) converter for dimming low-voltage high-current LED lighting application. An improved driving circuit of a self-driven (SD) synchronous rectification (SR) is proposed for switching loss reduction at the secondary of the transformer. The control circuit is designed such that the SR MOSFET switch operates under zero-voltage switching (ZVS) mode while the driving signals are always within the acceptable voltage limits under duty cycle variations of the LED dimming applications. Experimental results obtained from a 60-W prototype have shown that the switches operate under ZVS throughout all operating region where the highest efficiency of the AHB converter is at 96.4%.

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“…However, the synchronous rectifiers need external sources and signals to detect the direction of current, so that remodelling the circuit is needed for the synchronous rectifiers. A lot of circuits that use transformers for the synchronous rectifications have been studied [1]- [4]. Power supplies that use such these synchronous rectification circuits become large when they are used at low frequencies or large load current because the transformers have to become large in these cases.…”

Section: Introductionmentioning

confidence: 99%

Low-loss rectification circuit with no external drive input

Sakai

Takeshita

Suga

2009

2009 35th Annual Conference of IEEE Industrial Electronics

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We have developed the new low-loss rectification circuit that needed neither external signals nor power supplies for driving. This circuit creates the control power supply for the circuit operation from reverse voltage. The direction of the current that flows in this circuit is detected from the voltage between the MOSFET drain and source. The current is rectified by driving MOSFETs according to this detection result. Also, the circuit has several types of MOSFET connected in parallel. Types and numbers of MOSFETs are automatically selected to minimize the loss according to the magnitude of the current detected from the voltage between the MOSFET drain and the source. To create the power supply and the signal for the rectification circuit, the circuit needs no inputs from outside like a diode. Therefore, this circuit can be easily substituted for a conventional diode. In operation tests, the minimum forward voltage drop was 0.04 [V] when the current was rectified. As a result, the forward voltage drop was less than 1/10 compared to conventional diodes, and the loss could be decreased extremely. Therefore, the miniaturization of the electric equipment that radiation fin and fan becomes possible, too. The low-loss rectification circuit can save energies by substituting diodes for prevention of global warming.

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A novel synchronous rectification circuit using a saturable current transformer

Cited by 9 publications

References 1 publication

Synchronous rectifier driving circuit based on voltage‐driven method with energy recovery

Synchronous rectifier driving circuit based on voltage‐driven method with energy recovery

An improved self-driven synchronous rectifier for high efficiency dimmable LED lighting applications

Low-loss rectification circuit with no external drive input

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