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Design and Experimental Verification of an Integrated Boost-Flyback Converter with Voltage Multiplier
(2024-01-01)
Tattiwong, Kaweewat
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Sopin, Anan
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Poungnoiy, Saisunee
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Kalnaowakul, Phuri
;
Singhata, Napassadol
This paper introduces the design and experimental validation of an integrated boost-flyback converter with a voltage multiplier (IBFCVM). It describes the operation of the IBFCVM and provides its essential voltage and current equations. A phototyped circuit design for a 72W, 12V-to-120V IBFCVM is presented. Experimental results demonstrate that the proposed IBFCVM exhibits effective output voltage regulation, achieving an impressive efficiency of 89.9%.
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Simplified Analysis and Validation of a Two-switch Flyback Converter
(2024-01-01)
Wuti, Virot
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Bunlaksananusorn, Chanin
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Trakuldit, Siripan
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Tattiwong, Kaweewat
;
Luangpol, Amata
This paper presents a simplified analysis and validation of a two-switch flyback converter. When parasitic components, i.e. the MOSFET's output capacitance and transformer's leakage inductance, are neglected, circuit analysis of the two-switch flyback converter is greatly simplified and derivation of the converter equations becomes straightforward. The validity of the derived equations, which are useful for the converter design, is confirmed by simulation and experimental results.
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A New Tapped Inductor Buck Converter with Large Step-Down Voltage Conversion
(2023-01-01)
Trakuldit, Siripan
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Bunlaksananusorn, Chanin
;
Kittiratsatcha, Supat
This paper presents a new DC-DC converter with large step-down voltage conversion. The proposed converter is obtained by cascading an input circuit of a Quadratic Buck Converter (QBC) to a Tapped Inductor Buck Converter (TIBC). It uses only one active switch and provides a wider voltage conversion range than other well-known step-down converters. In the paper, the operation of the proposed converter is described. Circuit analysis is performed to derive the voltage gain and key current and voltage equations. The prototype circuit operating with the input voltage of 150 V, the output voltage of 5 V, the load current of 10 A and the switching frequency of 100 kHz is implemented. Experimental results show that the prototype converter exhibits good output voltage regulation and achieves the 30-to-1 voltage step-down operation with a maximum efficiency of 82%. In addition, measurement results confirm that the converter operation is consistent with the theoretical analysis.
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Analysis and Design of a Tapped Inductor Boost Converter
(2023-01-01)
Tattiwong, Kaweewat
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Trakuldit, Siripan
;
Bunlaksananusorn, Chanin
This paper presents an analysis and design of a Tapped Inductor Boost Converter (TBC). The converter operation is analyzed, resulting in key voltage and current expressions for the circuit. Based on the derived equations, a prototype converter is designed and subsequently used for experiment. It is found that the experimental results are consistent with the analytical values.
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Analysis and Experimental Verification of a Tapped Inductor Buck Converter
(2023-01-01)
Trakuldit, Siripan
;
Tattiwong, Kaweewat
;
Bunlaksananusorn, Chanin
Modern electronic and information technology equipment require a low DC voltage for operation. Therefore, a power supply used in these devices must be capable of a wide voltage conversion. This paper presents an analysis and experimental verification of a Tapped Inductor Buck Converter (TIBC), which employs a coupled inductor to realize a steep voltage step-down gain. A prototype TIBC is built and tested. The measurement confirms that experimental results are consistent with the analytical ones.
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Design and evaluation of a Quadratic Buck Converter
(2022-04-01)
Trakuldit, Siripan
;
Tattiwong, Kaweewat
;
Bunlaksananusorn, Chanin
This paper presents design and evaluation of a Quadratic Buck Converter (QBC). A step-by-step procedure to select the converter's component values and semiconductor device ratings is demonstrated. A prototype QBC with a simple closed loop output voltage control is constructed and experimentally evaluated. It is shown that the converter performs well within the design specification, has good output voltage regulation and fast transient response, and achieves the highest efficiency of 82%.
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A Simplified Analysis and Design of an RCD Clamp Forward Converter
(2022-01-01)
Wuti, Virot
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Trakuldit, Siripan
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Luangpol, Amata
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Tattiwong, Kaweewat
;
Taylim, Alisala
A conventional forward converter requires a transformer having an extra winding to assist in magnetic core reset, thus complicating the design and increasing the production cost. These shortcomings can be overcome by using an RCD clamp forward converter. This article presents a simplified analysis and design of the RCD clamp forward converter. The laboratory prototype is constructed. Experimental results demonstrates that the prototype converter is capable of providing a constant output voltage throughout its operating condition and has the maximum efficiency of 85%.
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Dynamic modeling and closed-loop control of a tapped inductor buck converter
(2021-06-02)
Trakuldit, Siripan
;
Bunlaksananusorn, Chanin
Modern smart electronic and information technology (IT) devices require a low DC voltage for operation. The low supply voltage is typically provided by a dedicated DC−DC converter by stepping down the system's bus voltage (e.g., 12 V). It is essential that the converter possesses a large voltage step-down gain and, at the same time, operates at high efficiency. A tapped inductor buck converter (TIBC) is a topology that has a potential to meet these requirements. It has a simple circuit structure and high efficiency similar to a buck converter, but can give a larger voltage step-down gain. This paper presents a dynamic modeling and closed-loop control of a TIBC. The state space averaging (SSA) method is adopted for the dynamic modeling to derive small-signal transfer functions of the converter. Based on the duty-cycle-to-output voltage transfer function, a closed-loop control is designed to keep the converter's output voltage constant. To verify the design, a prototype TIBC with closed-loop control is implemented. Experimental results show that the prototype converter has good output voltage regulation and fast transient response when subject to a step load. The effect of the crossover frequency and phase margin on the converter's transient response is also illustrated.
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Analysis and design of a zero-voltage-switched (ZVS) quasi-resonant buck converter operating in full-wave mode
(2020-07-01)
Wuti, Virot
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Luangpol, Amata
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Tattiwong, Kaweewat
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Trakuldit, Siripan
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Taylim, Alisala
Hard-switching is typically used in most DC-DC converters, where transition of a power switch occurs when it still carries current and is subject to voltage at the same time. The hard-switching operation incurs high stress and switching losses to the device. These problems can be alleviated by zero voltage switching in which a power switch is made to turn on and off at zero voltage. This paper presents analysis and design of a Zero-Voltage-Switched (ZVS) quasi-resonant buck converter operating in full-wave mode. The prototype converter is designed and built. Test results show that the designed converter achieves zero voltage switching and possesses good output regulation throughout its operating range.
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Compensator design for a peak current mode controlled buck converter
(2019-07-01)
Trakuldit, Siripan
;
Bunlaksananusorn, Chanin
This paper presents compensator design for a peak current mode controlled buck converter. Given the closed-loop converter model, the open loop and output impedance transfer functions are derived. Based on the open loop transfer function, the compensator design is carried out to yield the open loop frequency response with a desired gain, crossover frequency, and phase margin. The well designed compensator also results in small output impedance, which is an indicator for good output voltage regulation. Both simulated and experimental results are presented to validate the compensator design.

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