A novel zero-current-detector for DCM operation in synchronous converter

Gao, Yuan; Wang, Shenglei; Li, Haiqi; Chen, Leicheng; Fan, Shiquan; Li, Geng

doi:10.1109/isie.2012.6237066

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…Figure 9 display soft-switching waveform at low load condition(𝑃 𝑜 = 80W). With (7), The resonant current decreases as the output power decreases, and the conditions for maintaining soft switching operation of the switch will become more stringent. Therefore, the soft switching operation can be maintained at the lowest load that ensuring the whole load range of soft switching operation.…”

Section: Design and Experimental Verificationmentioning

confidence: 99%

“…The modern AC/DC converters have drawn many attentions from industrial field, and it has been widely applied in modern energy storage system, such as renewable generation system or electric vehicle (EV) charging system, etc [1]- [4]. Especially for those renewable generation system, a isolated high frequency (HF) AC/DC converters has gained considerable attention due to galvanic isolation, high power-density, high power factor (PF) [5]- [7] and low total harmonic distortion (THD) [8]- [11]. In [12], to improve AC/DC converters performance, a discontinuous current mode (DCM) to correct power factor was adopted in the AC input side of a phase-shift full bridge (PSFB) converter.…”

Section: Introductionmentioning

confidence: 99%

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A novel high frequency isolated dual-transformer LCL-type resonant AC/DC converter to minimize total loss over whole load range

Zhou,

Tang,

Zeng

2024

IEICE Electron. Express

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A modified dual-transformer topology with associated analysis is presented in this paper, which maintained soft-switching operation and depressed current stress to achieve higher conversion efficiency. The proposed resonant converter it contained two transformers and adopted phase shift modulation to regulate output power, so that converters output power can be controlled in simple and stable strategy. A method to depress resonant current stress is proposed in design progress. With lower current and fewer power components is helpful to reduce conduction loss. Based on the steady-state analysis, a design example is given. Finally, experimental works and comparison work on a lab prototype are performed, which validate the performance improvement of the proposed converter.

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Section: Design and Experimental Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel high frequency isolated dual-transformer LCL-type resonant AC/DC converter to minimize total loss over whole load range

Zhou,

Tang,

Zeng

2024

IEICE Electron. Express

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show abstract

“…However, this method will cause additional losses and reduce the conversion efficiency of the converter. The second method is to use the sampling circuit to copy the current on the synchronous rectifying switch, convert it into voltage, and then use the operational amplifier for processing [12,13]. This method has higher requirements on the operational amplifier and occupies a large chip area, which increases the complexity of the circuit.…”

Section: Zero-crossing Detector With Freewheel Switchmentioning

confidence: 99%

A Dual-Mode Step-Down Converter with Automatic Mode Switch Circuit for System-on-Chip Applications

Liu

Taishan²,

2023

Electronics

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In this paper, a dual-mode step-down DC-DC converter with an automatic mode-switching circuit is implemented in a 28 nm digital CMOS process and embedded in an RF transceiver chip to power the digital part. The proposed automatic mode-switching circuit includes a frequency-voltage conversion circuit that is designed according to the principle of charge redistribution on capacitance. The converter can switch modes according to the load without external intervention. This converter, along with a PMU sequencer, can also provide a solution for low-power design for system-on-chip applications. The IC occupies a total die area of 0.378 mm2. The input voltage of the converter is 3.3 V, the output voltage is 1.05 V, and the maximum load current can reach 1 A. The converter shows a conversion efficiency of not less than 81% at a full load range and can achieve a peak conversion efficiency of 91% when the load current is 100 mA. The load range of the PWM mode is 1 A to 50 mA, and that of the PFM mode is 100 mA to 1 mA. The combination of zero-crossing detection circuitry and freewheel switches can reduce energy loss and eliminate additional electromagnetic interference.

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“…The DCM control algorithm is added to eliminate the reverse current, thus improving the light load efficiency [5].The reverse current detection is realized by the common gate comparator [42]. A large size free-wheel switch (FWS) transistor is added to reduce the ring effect when both NMOS and PMOS are turned off [43].…”

Section: G Dcm Operationmentioning

confidence: 99%

A 40nm CMOS Hysteretic Buck DC-DC Converter With Digital-Controlled Power-Driving-Tracked-Duration Current Pump

2020

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A novel zero-current-detector for DCM operation in synchronous converter

Cited by 17 publications

References 6 publications

A novel high frequency isolated dual-transformer LCL-type resonant AC/DC converter to minimize total loss over whole load range

A novel high frequency isolated dual-transformer LCL-type resonant AC/DC converter to minimize total loss over whole load range

A Dual-Mode Step-Down Converter with Automatic Mode Switch Circuit for System-on-Chip Applications

A 40nm CMOS Hysteretic Buck DC-DC Converter With Digital-Controlled Power-Driving-Tracked-Duration Current Pump

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