KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 17

Some of the metrics are blocked by your
consent settings
A novel Zero-Current-Switching of leading and lagging-leg switches for full-bridge phase-shifted PWM DC-DC converter
(2015-08-17)
Songboonkaew, J.
;
Jangwanitlert, A.
This paper presents a novel Zero-Current-Switching(ZCS) technique of the leading and lagging-leg switches. The leading-leg switches are achieved under ZCS by using an active auxiliary circuit and the lagging-leg switches are achieved under the ZCS by using a blocking capacitor voltage in primary side for decreasing the primary current. Moreover, the leading-lag switches are still achieved under the ZVS condition by using the energy of the leakage inductance. In this paper, the DC-DC full-bridge converter operation is described. Experimental results provided from a 1 kW 30 kHz prototype and validated the feasibility.
Some of the metrics are blocked by your
consent settings
Fuzzy phase-lock-loop for a two-output high-frequency series-resonant induction heater
(2015-01-26)
Kongsakorn, P.
;
Jangwanitlert, A.
This paper presents the design and concept of fuzzy phase-lock loop for a two-output high-frequency series-resonant induction heater. This conceptual controller is applied for an unknown mathematical model as well as this prototype, which is used to maintain Zero-Voltage Switching condition along with the period by automated adjusting switching frequency. The power of the prototype can be controlled by using 3 branches of full bridge series-resonant inverter: one branch for common controlled and others controlled for each independently two-output. The simulation result is verified by MATLAB/Simulink®.
Some of the metrics are blocked by your
consent settings
Analysis of a wide load variation of ZVZCS phase-shifted PWM full-bridge DC-DC converter
(2014-10-15)
Jangwanitlert, A.
This paper presents a wide load variation of the improved ZVZCS phase-shifted PWM full-bridge dc-dc converter, which can deliver power efficiently. The key operation waveforms of the full-bridge converter from absolutely no-load to full-load conditions are described. In order to confirm wide load variations, the converter should not only operate with soft-switching from full load to no-load condition with satisfactory efficiency for the full range of operation, but the voltage across the output diode bridge also needs to be clamped to keep away from any reverse voltage overshoots arising during turn-off of the output rectifying diodes. In order to achieve zero-voltage switching (ZVS) at turn-on for all load conditions, the converter employs auxiliary coupled inductors near lossless auxiliary circuit. Moreover, the proposed topology is based on a current driven rectifier in order to clamp the voltage of the output rectifying diodes and also obtain ZVZCS of the converter operation, resulting in superior efficiency for all load conditions. In this paper, the converter operation is described. Experimental results provided from a 1 kW prototype validate the feasibility.
Some of the metrics are blocked by your
consent settings
An improved Three-Level Zero-Voltage and Zero-Current Switching PWM DC-DC converter for battery charger
(2014-01-01)
Jangwanitlert, A.
This paper describes a 2-kW Three-Level Zero-Voltage and Zero-Current Switching (TL-ZVZCS) PWM dc-dc converter for battery charger. To solve the disadvantages from TL-Zero-Voltage Switching (ZVS) such as a circulating primary current and parasitic voltage ringing on the dual diodes rectifier, a proposed simple auxiliary circuit is composed of a small capacitor with two small diodes is put on the transformer secondary side to achieve ZVZCS conditions of primary switches and to clamp secondary voltage rectifier. The auxiliary circuit does not give any losses in components and additional active switches, which provides the proposed circuit converter more effective and efficient. Moreover, this paper describes the key operation waveforms, operational modes and design considerations. The concept idea is verified by the MATLAB simulation. © 2014 IEEE.
Some of the metrics are blocked by your
consent settings
Fuzzy logic control of a two-output high-frequency series-resonant induction heater
(2014-01-01)
Kongsakorn, P.
;
Jangwanitlert, A.
This paper presents the design and concept of fuzzy logic controller analysis of two-output high-frequency series-resonant induction heater. The fuzzy logic controller is applied for non-linear load and unknown mathematical model as well as this prototype, which is used to control the duty-cycle of power switch to maintain current output. The power of the prototype can be controlled by using 3 branches of full bridge series resonant inverter: one branch for common controlled and others controlled for each independently two output. The power for others can be controlled by the asymmetrical voltage cancellation methodology. © 2014 IEEE.
Some of the metrics are blocked by your
consent settings
Small signal modeling of a two-output high-frequency series-resonant induction heater
(2014-01-01)
Kongsakorn, P.
;
Jangwanitlert, A.
This paper proposes the analysis of a small-signal model of two-output high-frequency series-resonant induction heater. There are 2 control loops: power control by duty-cycle and frequency control to maintain the zero-voltage switching condition for all operating period. This prototype controls power by using 3 branches of full bridge series-resonant inverter: one branch for common control and others for each independently two-output whose power controlled by the asymmetrical voltage cancellation methodology. The small-signal equivalent circuit model is confirmed by PSpice with good agreement in simulation data. © 2014 IEEE.
Some of the metrics are blocked by your
consent settings
Analysis of three-level full -bridge ZVZCS PWM converter with simple auxiliary circuit
(2012-10-02)
Songboonkaew, J.
;
Jangwanitlert, A.
This paper proposes a three-level full-bridge ZVZCS converter with ZVS turn on and ZCS turn off conditions using a simple auxiliary circuit on secondary side. The primary current is reset in order to reduce circulating current in transformer and voltage stress and spike voltage of diode bridge rectifier on secondary side. The control strategy uses double phase-shift PWM to control output voltage. Therefore, the lower breakdown voltage of diodes, the smaller LC filter. The simple auxiliary circuit can help to maintain output voltage. Also, The experimental and simulation results from a 100 V/10 A, 60 kHz are also presented, which is used to verify the theoretical analysis. © 2012 IEEE.
Some of the metrics are blocked by your
consent settings
A series-resonant half-bridge inverter for induction-iron appliances
(2011-12-01)
Sanajit, N.
;
Jangwanitlert, A.
This paper presents a series-resonant half-bridge inverter for induction iron appliances. The series-resonant inverter is implemented to provide Zero Current Switching (ZCS) for all the switches at turn off conditions and Zero Voltage Switching (ZVS) at diode turn on. The main features of the proposed inverter are simple PWM control strategy and high efficiency. The operation mode of the inverter will be evaluated corresponding to the duty cycle of the switch. The experimental results verify the advantages of the proposed topology. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
A fixed frequency PWM induction shower using the duty cycle
(2010-12-01)
Sanajit, N.
;
Jangwanitlert, A.
This paper presents a 2 kW, 36.5 kHz induction shower using a duty cycle control. The principle of this depends on induction heating from high frequency electromagnetic induction. The high frequency electric current passes through two induction coils connected in parallel so as to induce current at work piece that uses a stainless steel box and transfer heat to water inside it. The control uses the duty cycle which is generated from integrated circuit. In addition, this paper analysis output power and efficiency compared with the duty cycle. The results waveform shown as a ZVS condition is agreed with the theory one. A fixed PWM induction shower gives the rated output power and makes the temperature rise to 41 °C at the work piece in steady state within 2 min. ©2010 IEEE.
Some of the metrics are blocked by your
consent settings
An asymmetrical half-bridge forward converter with current doubler
(2010-07-30)
Jangwanitlert, A.
;
Songboonkaew, J.
This paper presents the analysis and design of an asymmetrical half-bridge forward converter with current doubler. This converter can minimize the switching power loss by realizing the zero-voltage-switching (ZVS) during the turn-on conditions. The principle of the converter operation is explained and analyzed. In order to achieve the ZVS conditions, the required interlock delay time between gate signals of two switches, the leakage transformer inductance is needed. The simulation results from a 30 V/20 A 80 kHz are also presented, which is used to verify the theoretical analysis.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results