The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
According to the requirements of the power factor and the dynamic performance of the asynchronous machine tools, an asynchronous motor inverter with three-channel interleaved PFC module is proposed. The proposed inverter is a 5kW asynchronous motor drive control system. The firstly discussed was hardware design of the drive system, especially PFC module. In the end, experimental results in different...
In this paper, a flexible absolute circuit of advanced power factor correction (PFC) control for a bridgeless boost converter is proposed. The proposed circuit are able to eliminate the diode-bridge short-circuit problem if negative sensing signal is required by the power factor correction (PFC) controller. The polarity of the absolute circuit output could be changed just by reversing the polarity...
This work presents a driver for High-Brightness Light-Emitting Diodes (HB-LED) in three-phase grids, which complies with IEC 1000-3-2 Class C requirements, achieves high Power Factor (PF), low Total Harmonic Distortion (THD), as well as, the capability to achieve full dimming while disposing of the bulk capacitor and having galvanic isolation. The HB-LED driver is based on the use of six four-port...
This paper deals with a modular, isolated-output, polyphase, AC/DC converter based on the use of Resistor Emulators (REs). A RE is a DC/DC converter that behaves as a resistor at its input port. The value of this resistor (input impedance) is controlled by the converter duty cycle. In the proposed topology, all the REs are controlled to have the same input impedance, whose value is determined by the...
This paper presents a modified Valley-Fill (VF) ballast circuit to combine with a current fed resonant inverter as the power circuit for a high power factor VF electronic ballast. The original VF circuit permit input current conduction from 30° to 150°, and then from 210° to 330°. Due to this discontinuity, high total harmonic distortion (THD) results into the input current waveform. The modified...
The main contribution of this paper is an extension of the recently introduced result that recasts the problem of power factor compensation for nonlinear loads with non-sinusoidal source voltage in terms of the property of cyclo-dissipativity. Using the cyclo-dissipativity framework the classical capacitor and inductor compensators can be interpreted in terms of energy equalization. Unfortunately,...
Recently, it has been established that the problem of power factor compensation for nonlinear loads with non-sinusoidal source voltage can be recast in terms of the property of cyclo-dissipativity. Using this framework the classical capacitor and inductor compensators can be interpreted in terms of energy equalization. Unfortunately, the supply rate is a function of the load, which is usually unknown,...
This paper introduces the new PFC integration control chip-UCC28019, provides the PFC circuit based on UCC28019 and the essential circuit parameter computation method. The actual power factor is 0.998 through testing a 350 W prototype, this paper presents the experimental waveforms. The experimental results have proved that the PFC circuit has these characteristics: simple circuit, conveniently to...
For years, many authors have done new proposals about the use of single-stage solutions to meet IEC 61000-3-2 regulations. These kinds of topologies can reduce the harmonic content without excessively penalizing the efficiency of the converter. Furthermore, although they are called single-stage topologies, actually, they are not exactly single-stage converters because a part of the energy is processed...
A new application of power source element in power factor correction is proposed. The power source is inserted between the bridge rectifier diodes and a large bulk capacitor to increase the conduction angle of the rectifier diodes. The power from the DC bus is transferred to power the source via a loss free resistor connected with the DC bus. Analysis, design example, control scheme, and simulation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.