Introduction to A New Single Phase Soft-Switching Power Factor Correction Converter:
From several years, the power electronic systems and devices have been playing important role in our day-to-day life activities. By using these electronic devices frequently, they should generate harmonic current because of their destroying or damaging the electricity network. Receiver should be affected by the harmonics while doing the operation on receiver. To overcome this effect our engineers are creating electronic devices.
The main role of this project is, by using low harmonic and High-power factor converters with soft-switching (SS) techniques improve the efficiency, high reliability and decrease the cost of components. These converters are used because of the previous used converters (A-D converters) have some disadvantages are low power factor and voltage distortion, slow varying ripples at output dc load, low efficiency and large size of ac and dc filters because of low power quality in terms of injected harmonics. High-switching frequencies are being required by these converters. High switching losses, increased electromagnetic efficiency (EMI) and reduced converter efficiency all these drawbacks are caused by the operation of high-switching frequency. To overcome these drawbacks we should use those SS techniques.
In the working principle, mainly SS has four types of groups are zero-voltage switching (ZVS), zero-current switching (ZCS), zero-voltage transition (ZVT), and zero-current transition (ZCT) with pulse width modulation(PWM) control. In this operation we have switching power loss; it has current and voltage losses during switching period. Power diode’s reverse recovery loss and discharge energy loss of the main switch parasitic capacitance. Compare to previous converters ZVS and ZCS are advanced, compare to these converters ZVT and ZCT are more advanced. So switching power loss is completely overcome.
In this we have mainly two switches. One is Main switch with main diode consists of one parasitic capacitance of main switch and diode, upper and lower snubber inductances, One snubber capacitance. Another switch is Auxiliary switch consists of four auxiliary diodes; One is magnetization inductance, output and input leakage inductances of the transformer respectively. For one cycle twelve stages will be taken by the proposed converter. To achieve this SS there must be four conditions; Main switch is turning ON with ZVT and turn OFF with ZCT. Auxiliary switch is turn ON&OFF with ZCS.
The features of proposed converter are there is no extra current or voltage stress on the main switch and main diode, all semiconductors and other components work with SS, passive snubber is not required, a common ground is used for both main and auxiliary switches so easily control the converter, by using silicon carbide (SIC) diode’s reverse recovery problem will be recovered, etc.
Finally by using this new proposed converter (PFC) realized with 200v ac, getting output is 400v dc , It is switched with 100kHz for 300W output load. For full load 98% of efficiency will achieved. Finally 0.99 value of power factor was reached by our new PFC converter with sharp sinusoidal signal.
Download ECE Project Report on A New Single Phase Soft-Switching Power Factor Correction Converter.