Development of ZVS single-stage isolated converters with a PFC feature based on asymmetrical half-bridge topology

Wu, T.-F.; Hung, J.-C.

doi:10.1109/psec.2002.1022366

Cited by 6 publications

(8 citation statements)

References 16 publications

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“…A small LC filter is included in the output to eliminate the voltage difference between the two voltage sources and the unwanted switching noise. L b after the rectifier is used to provide the PFC function for the LED driver by operating the current through L b in discontinuous-conduction mode [7]. It should be noted that a non-electrolytic capacitor can be used for the intermediate capacitor by allowing considerable voltage variation on C DC such that the lifetime of the LED driver can be prolonged.…”

mentioning

confidence: 99%

Low‐current ripple LED driver by two‐phase driving approach

et al. 2015

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A two-phase driving approach for light-emitting diode (LED) power supply is proposed. The approach uses two rectangular current sources working complementarily to supply a constant current to the LED string so that the output current can contain very low ripple even without the use of any electrolytic capacitor in the driver circuit. A dual asymmetrical half-bridge converter with power factor correction is used to realise the approach. A 60 W prototype is built and tested to validate the idea.

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mentioning

confidence: 99%

Low‐current ripple LED driver by two‐phase driving approach

et al. 2015

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“…The driving signal should be applied to power switch S 1 when its body diode is conducting current, achieving a ZVS feature. Adding I Lin2 can increase the range of ZVS of switch S 1 as compared with that proposed in [9]. This feature can be observed from the key waveforms shown in Fig.…”

Section: Dc/dc Converter Currentmentioning

confidence: 77%

“…The inductor currents will naturally follow the line voltage waveform to achieve a high power factor. In addition, ripple current can be reduced and only is a small line-filter size needed as compared to that proposed in [9]. The output voltage can be regulated by both duty-cycle control and frequency control [8].…”

Section: Dc/dc Converter Currentmentioning

confidence: 99%

“…To improve power factor, a common way is to combine a boost semi-stage and an asymmetrical PWM semi-stage by sharing their active switches. A high power factor is achieved by the boost semi-stage operated in discontinuous conduction mode (DCM), while the output regulation is achieved by the other semi-stage [9]. However, the boost semi-stage operated in DCM will result in high input current ripple and requiring a relatively large filter.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with those of a single-inductor boost stage[9], the power factor and THD in the proposed converter are improved due to a smaller α being required for a given V DC . The power factor and THD curves of the proposed converter are the same as those shown in[8] under the condition of L in1 /L in2 = D / ' D .…”

mentioning

confidence: 99%

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High power factor single-stage ZVS charger with coupled inductors

Hung

Tseng

et al.

38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003.

Self Cite

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This paper presents a zero voltage switching (ZVS) single-stage charger with power factor correction (PFC) based on an asymmetrical half-bridge topology and coupled inductors. The proposed charger is formed from a PFC converter and an asymmetrical half-bridge converter. Coupled inductors are adopted to reduce input current ripple caused by asymmetrical PWM operation, resulting in small input filters. The converter has the features of constant frequency operation, ZVS and low voltage stress imposed on the active switches. Moreover, it can achieve high power factor, high power density, high efficiency, low switching loss and low component count, which make converter operation at medium power levels feasible. In the paper, theoretical analysis and experimental results for a charger with the proposed topology have been obtained, which verify its feasibility.

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A novel PFM/PWM hybrid modulated single‐stage FSBB‐LLC AC‐DC converter

Liang

et al. 2023

Circuit Theory & Apps

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SummaryBy integrating the four switch buck–boost (FSBB) PFC and full‐bridge LLC resonant converter, a novel single‐stage FSBB‐LLC AC‐DC converter is proposed. Meanwhile, the corresponding PFM/PWM hybrid modulation is put forward. The proposed solution employs a dual‐loop feedback control strategy based on PFM/PWM hybrid modulation to obtain the desired bus voltage and stable output voltage. The bus voltage feedback loop is mainly used to smoothly determine the boost or buck–boost mode of FSBB PFC cell for regulating the bus voltage; the output voltage feedback loop is in charge of stabilizing the output voltage by adjusting the switching frequency or phase shifting angle. Furthermore, an optimal parameter design based on power balance principle is also derived. The experimental results of an 85 ~ 300 V input, 12V/25A output prototype demonstrate that (1) low and narrow bus voltage of 240 ~ 340 V is achieved under the entire input and output condition; (2) the LLC cell operates at DCX mode over the whole load range as the input voltage exceeds 120 V; (3) the output voltage is well regulated even under the no‐load condition; (4) ZVS feature for the shared switches is still maintained; and (5) a peak efficiency of 90.9% and PF values above 0.987 are achieved.

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Development of ZVS single-stage isolated converters with a PFC feature based on asymmetrical half-bridge topology

Cited by 6 publications

References 16 publications

Low‐current ripple LED driver by two‐phase driving approach

Low‐current ripple LED driver by two‐phase driving approach

High power factor single-stage ZVS charger with coupled inductors

A novel PFM/PWM hybrid modulated single‐stage FSBB‐LLC AC‐DC converter

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