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![Fig. 1. Boundary mode flyback converter [5]](profile/Kali-Nara/publication/343151184/figure/fig1/AS:916340906942464@1595484105485/Boundary-mode-flyback-converter-5_Q320.jpg)
![Fig. 2. Theoretical transformer peak and average currents [5]](profile/Kali-Nara/publication/343151184/figure/fig2/AS:916340906917888@1595484105616/Theoretical-transformer-peak-and-average-currents-5_Q320.jpg)
This paper discusses a 100 W single stage Power Factor Correction (PFC) flyback converter operating in boundary mode constant ON time methodology using a synchronous MOS-FET rectifier on the secondary side to achieve higher efficiency. Unlike conventional designs which use two stage approach such as PFC plus a LLC resonant stage or a two stage PFC...
Contexts in source publication
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... Fig. 1 the basic diagram of a single stage flyback converter is shown. When the primary MOSFET turns ON, the current in the transformer primary ramps up as shown in Fig. 2. During the primary MOSFET ON time, the voltage across the primary magnetizing inductance is equal to the input voltage. When primary MOSFET is ON, the secondary side diode ...
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... this paper a 100W PFC flyback design, on the secondary side a TL431 is used which has an internal 2.5 V reference (Fig. 11). When the output voltage goes higher than 2.5V, the TL431 starts sinking current, thereby modulating the current in the optocoupler diode which turns ON the internal BJT transistor. The collector of this BJT transistor is connected to the COMP pin of the IC IRS2982. Once the BJT turns ON, the COMP is pulled low, thereby limiting the ...
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... the schematic shown in Fig. 11, the output capacitance used is around 1410 µF. The higher the capacitance, the lower is the 120 Hz ripple. The leakage in a flyback transformer can be an issue for the operation of the primary MOSFET. When the primary MOSFET in the converter turns OFF, the leakage inductance of the transformer rings with the C oss of the MOSFET. The ...
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... Fig. 11 the snubber capacitor is a 2.2 nF/ 630 V and snubber resistor is a 2 W/ 75 kΩ Table II lists the power factor, THD, efficiency, and output voltage regulation at various loads starting from no load to a full load of 100 W at 120 V input AC line voltage. As it can be seen from the table, the output voltage regulation over the load is ...
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... of converter at 120 Vac and figure 7 show the waveforms at 230 Vac. The AC ripple on the output voltage can be reduced by adding extra capacitors. Fig. 6 shows the start-up of the converter. As it can be seen there is no overshoot on the output voltage at the start up. The Figs. 8 and 9 show the steady state waveforms of the designed converter. Figs. 11 and 12 show the complete schematic of the flyback converter. From figures 13 and 14, it is clear that the flyback converter is very stable as phase margin is 40 degrees at 120 VAC and 54 degrees at 230 VAC. Figure 10 illustrates the V DS and V GS waveforms of secondary side MOSFET at 230 VAC. When drain current on the secondary flows through ...
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... figures 13 and 14, it is clear that the flyback converter is very stable as phase margin is 40 degrees at 120 VAC and 54 degrees at 230 VAC. Figure 10 illustrates the V DS and V GS waveforms of secondary side MOSFET at 230 VAC. When drain current on the secondary flows through the body diode of the secondary MOSFET, the synchronous IC IR1161L uses the V DS sensing method to detect the negative V DS ( greater than -0.23 V) and turns ON the MOSFET gate to reduce the power losses in the diode. ...
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Citations
... Most plasma power supplies are based on stand-alone DC power combined with highvoltage power supplies [14,15] or Marx generators [16,17], and are thus bulky and heavy, with limited portability. To overcome these disadvantages, in this study, a flyback PFC converter [14,18] is use to replace the front-end DC power supply. Since the output voltage of a flyback converter is arbitrarily step-up/down, it is different from the boost system that is only used when the output voltage is higher than the input voltage. ...
... A high-power-factor power supply generally uses a boost topology to transform different AC inputs into a fixed high-voltage DC source. However, this study uses a flyback converter [18] that can perform output regulation and meets the universal AC voltage range. The designed power is approximately 60 W in the continuous output state. ...
... I s (t)=n·I p (t) (n: primary-to-secondary turns ratio) because this PFC converter operates in discontinuous current boundary mode [18], a single switching period Tsw equals the sum of the turn-on time ∆t on and the turn off time ∆t off , is shown by the current control condition in Figure 11. ...
This paper presents the design and implementation of a miniaturized high-voltage power supply with power factor correction (PFC) for atmospheric-pressure plasma jet (APPJ) applications. The sinusoidal output frequency and voltage of the power supply can be controlled independently from 16 to 24 kHz and from 1 to 10 kVpeak, respectively. A helium APPJ load is used to assess the performance of the developed power supply. It is shown that the developed high-voltage power supply operates effectively, and the designed PFC converter improves the input current distortion of the power supply. Not only the power factor of the power supply is increased from 0.41 to 0.95, but it also provides a low-ripple DC voltage, which reduces the high-voltage ripple of the output from 730 to 50 Vp-p. In this paper, the proposed design integrates the PFC converter into the high-voltage power supply so that the developed power supply has better electrical characteristics and the overall power supply can be significantly miniaturized.
This paper deals with a power factor corrected (PFC) flyback converter for high‐power light emitting diode lighting applications. This flyback converter is designed to operate in critical conduction mode to achieve improved power quality at universal AC mains and high efficiency with the low component count. The converter is analyzed using state‐space analysis with closed‐loop stability under varying input and output conditions. The PFC converter is designed and implemented with wide input and wide output variations. The performance of the prototype is also investigated for improved power quality such as power factor and harmonics distortion of AC mains current at universal AC mains of 85 to 265 V. The achieved efficiency of this converter is 92% and total harmonic distortion is less than 6% over universal AC mains for a prototype of 100 W, which are much improved results as compared to discontinuous conduction mode operation of the same converter.
