Implementation of a Parallel-Series Resonant Converter with Wide Input Voltage Range

Lin, Bor‐Ren

doi:10.3390/en12214095

Cited by 6 publications

(9 citation statements)

References 18 publications

(29 reference statements)

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“…The two-stage converters have the drawback of low efficiency, while the series-or parallel-connected converters have more circuit components, which increase the conduction loss and reduce the converter reliability. In [23,24], two full-bridge LLC converters with primary-parallel-secondary-series connection were proposed to achieve wide input or output voltage operation. However, eight power switches and eight diodes are used in this circuit topology.…”

Section: Introductionmentioning

confidence: 99%

“…Comparing the center-tapped rectifier structure, the voltage double rectifier structure has less conduction losses for rectifier diodes and secondary windings. Comparing the conventional two-stage power converters, parallel-series connected converters, and the other resonant converters in [19][20][21][22][23][24][25][26], the presented LLC resonant converter has a simple circuit structure, a simple control algorithm, and requires fewer power components to achieve wide voltage operation. The description of the presented circuit schematic and operation principle is presented in Section 2.…”

Section: Introductionmentioning

confidence: 99%

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Wide Voltage Resonant Converter Using a Variable Winding Turns Ratio

Lin

Dai

2020

Electronics

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This paper presents a inductor–inductor–capacitor (LLC) resonant converter with variable winding turns to achieve wide voltage operation (100–400 V) and realize soft switching operation over the entire load range. Resonant converters have been developed for consumer power units in computers, power servers, medical equipment, and adaptors due to the advantages of less switching loss and better circuit efficiency. The main disadvantages of the LLC resonant converter are narrow voltage range operation owing to wide switching frequency variation and limited voltage gain. For computer power supplies with hold-up time function, electric vehicle battery chargers, and for power conversion in solar panels, wide input voltage or wide output voltage operation capability is normally demanded for powered electronics. To meet these requirements, the variable winding turns are used in the presented circuit to achieve high- or low-voltage gain when Vin is at low- or high-voltage, respectively. Therefore, the wide voltage operation capability can be implemented in the presented resonant circuit. The variable winding turns are controlled by an alternating current (AC) power switch with two back-to-back metal-oxide-semiconductor field-effect transistors (MOSFETs). A 500-W prototype is implemented and test results are presented to confirm the converter performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wide Voltage Resonant Converter Using a Variable Winding Turns Ratio

Lin

Dai

2020

Electronics

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“…However, in the case of the phase-shift switching method, the ZVS operation is difficult at light loads, resulting in much efficiency degradation [7]. Both a PWM switching method and a phase-shift switching method have been applied to compensate for the disadvantages of each switching method [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Power Device Temperature-Balancing Control Method for a Phase-Shift Full-Bridge Converter

et al. 2020

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In this paper, a switching method is proposed for power device temperature-balancing in a phase-shift full-bridge (PSFB) converter. PSFB is commonly used for applications that require high efficiency, because a zero-voltage switching (ZVS) operation is possible on the primary-side. In PSFB, the circulation current complicates ZVS under a light-load condition, which generates heat. Meanwhile, the heat generated in PSFB creates a temperature deviation between the lagging leg and the leading leg, which shortens the lifetime of the power device, thereby reducing system reliability and efficiency. To solve this problem, previous studies applied a pulse-width modulation (PWM) switching method for light and medium loads, and a phase-shift switching method for the region where ZVS is possible. Although this method has the advantage of easy control, the maximum temperature of the legs of the PSFB increases with medium loads. In this paper, a temperature-balancing algorithm—a temperature-balance control—is proposed to decrease the leg temperature using switching based on position exchanges of the leading leg and lagging leg along with PWM switching. Temperature-balance control minimizes leg temperature deviation under light load conditions. The proposed control method provides a minimum temperature difference between the two legs and high efficiency.

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“…Unfortunately, the classical two-stage or three-stage circuit topologies have high power losses and low efficiency. The series-parallel connected converters have been presented in [4][5][6][7] to have wide voltage operation. However, the drawbacks of these circuit topologies are many circuit switches and components in these circuit topologies and the circuit reliability and efficiency are reduced.…”

Section: Introductionmentioning

confidence: 99%

“…The inductor-inductor-capacitor (LLC) circuit topology is the most practical resonant converter with high frequency operation when compared to the different resonant circuit topologies. Unfortunately, the input or output voltage range in circuit topologies [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] is less than 4:1 (i.e., V in,max ≤ 4V in,min ) voltage range. Three-level or multi-level converters [20][21][22][23] with neutral-point diode-clamp, flying capacitor, and series-connected full-bridge circuit topologies are often adopted for high voltage operation to reduce the voltage ratings on active devices.…”

Section: Introductionmentioning

confidence: 99%

Phase-Shift PWM Converter with Wide Voltage Operation Capability

Lin

2019

Electronics

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A soft switching three-level pulse-width modulation (PWM) converter is presented for industrial electronics with wide voltage range operation, such as solar power or fuel cell applications. Phase shift PWM scheme is used on the input-side to accomplish the zero voltage turn-on on power switches and improve the converter efficiency. Three-level diode-clamp circuit topology is adopted in the presented circuit to lessen the voltage ratings on active devices for high voltage applications. Three sub-circuits with the different turns-ratio of transformers can be selected in the presented converter in order to achieve 10:1 (V in,max = 10V in,min ) wide input voltage operation when compared to the conventional multilevel converter. The proposed circuit is a single-stage converter instead of two-stage converter to realize wide voltage operation. Therefore, the presented converter has less component counts. Finally, the design procedure and experiments with a 300W laboratory circuit are presented and discussed to confirm the circuit analysis and converter performance.Electronics 2020, 9, 47 2 of 20 ZVS converters [24][25][26][27][28] can further eliminate the switching losses for medium voltage applications. However, the wide voltage operation is seldom discussed and investigated in conventional three-level soft switching converters. The input voltage range of the three-level converter that is discussed in [20][21][22][23][24][25][26][27][28] is less than 4:1 voltage range operation. For some wind power or solar power applications, the input voltage of DC converters might be greater than 6:1 or 8:1 voltage range, i.e., V in,max ≥ 6 or 8 V in,min .A ZVS three-level DC/DC converter is discussed and then investigated to have 10:1 (80 V~800 V) wide input voltage operation and ZVS operation on active devices. The presented three-level converter has three winding turns and three auxiliary switches on the output-side to achieve wide voltage range operation. Three auxiliary switches on the secondary-side are active or inactive and three different turns-ratio of the isolated transformer are connected to the output load based on the input voltage value. Thus, three equivalent sub-circuits can be operated in the proposed converter to achieve wide voltage operation. Three-level neutral-point diode-clamp converter is adopted on the input-side to have the advantages of low voltage rating and soft switching operation on active devices and increase circuit efficiency. The phase shift PWM operation is used to control the active devices of three-level converter. The leading-leg switches are easily turned on under ZVS operation. The presented circuit has less component counts with better circuit efficiency to achieve 10:1 wide voltage operation when compared to conventional two-stage DC converters. The proposed converter has much wider input voltage operation range as compared to conventional single-stage DC converters with 2:1 or 4:1 voltage range (10:1 voltage range from 80 V~800 V). The paper is organized, as follows. Section 2 discusses ...

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Implementation of a Parallel-Series Resonant Converter with Wide Input Voltage Range

Cited by 6 publications

References 18 publications

Wide Voltage Resonant Converter Using a Variable Winding Turns Ratio

Wide Voltage Resonant Converter Using a Variable Winding Turns Ratio

Power Device Temperature-Balancing Control Method for a Phase-Shift Full-Bridge Converter

Phase-Shift PWM Converter with Wide Voltage Operation Capability

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