Abstract:
According to at least one aspect, embodiments herein provide a method for providing regulated DC power to a load, the method comprising receiving input AC power, generating rectified AC power, the rectified AC power derived from the input AC power, converting the rectified AC power into regulated DC output power, and providing the regulated DC output power to an output coupled to the load.
Abstract:
According to at least one aspect, embodiments herein provide a UPS comprising an input to receive input power, an interface to receive DC battery power, a bi-directional converter coupled to the interface and configured to provide DC charging power, derived from the input power, to the battery in a first mode of operation and to convert the DC battery power into backup DC power in a second mode of operation, an output to provide output power to a load derived from at least one of the input power and the backup DC power, and a controller coupled to the bi-directional converter and configured to operate the bi-directional converter at a first frequency in the first mode of operation to generate the DC charging power and to operate the bi-directional converter at a second frequency in the second mode of operation to generate the backup DC power.
Abstract:
A high-frequency ac-dc power converter takes an input ac signal and converts it to an output dc signal. The converter has at least two front-end rectifier diodes arranged as a full wave rectifier of the input ac signal. A first inductor positioned at the output of the full wave rectifier. An output capacitor is connected across a load for the converter. There are at least one additional inductor and one additional capacitor. A switching circuit selectively forms different (LC) resonant circuits with the inductors and capacitors during a cycle of the input ac signal to form a dc-dc power converter.
Abstract:
An operating device (1) for at least one light emitting diode (21) comprises a power factor correction circuit (11) for supplying a DC voltage (V BUS ) as well as a control unit (13) for controlling the power factor correction circuit (11). The control unit (13) is designed to adjust the DC voltage (V BUS ) in accordance with an LED current (I LED ) in the at least one light emitting diode (21).
Abstract:
According to at least one aspect, embodiments herein provide a method for providing regulated DC power to a load, the method comprising receiving input AC power, generating rectified AC power, the rectified AC power derived from the input AC power, converting the rectified AC power into regulated DC output power, and providing the regulated DC output power to an output coupled to the load.
Abstract:
A bridgeless interleaved power factor correction (PFC) circuit using a single PFC choke having four windings formed on a single core to form the four input inductors of the PFC circuit. An AC-to-DC converter constructed using the bridgeless interleaved PFC circuit achieves high conversion efficiency with high power factor and low total harmonic distortion. Furthermore, the size of the PFC circuit is reduced by using a single PFC choke with quad-winding.
Abstract:
An electronic half-bridge ZETA converter may include a transformer, wherein a half-bridge is connected to the primary winding of transformer, and wherein a respective capacitance and a respective diode are associated with the half-bridge switches. Moreover, the converter includes a ZETA converter which is connected to secondary winding of transformer, so that the ZETA converter includes a first inductance, which includes the magnetization inductance of transformer, and a second inductance. Finally, the converter includes a control unit which drives the half-bridge switches with four time intervals that are repeated periodically. Specifically, during the fourth time interval the first and the second switch are opened, so that the capacitance associated with said second switch is charged and the capacitance associated with said first switch is discharged, enabling a zero voltage switching.
Abstract:
For the purpose of power factor correction, an inductance (21) is supplied with an input voltage (Vin), wherein a controllable switching means (24) that is coupled to the inductance (21) is actuated in order to selectively charge and discharge the inductance (21). A control device (14) for actuating the switching means (24) is designed such that it actuates the switching means (24) selectively on the basis of one of a plurality of modes of operation. In a first mode of operation, a switch-on time is stipulated for the switching means (24) on the basis of a minimum waiting time and on the basis of a voltage that drops across the switching means (24).
Abstract:
In an aspect, the present invention provides a high frequency switching power converter. The high frequency switching power converter may include a plurality of soft-switchable power cells flexibly connected to receive an input signal in series and provide an output. The high frequency switching power converter may further include a controller for configuring the flexible connection and for controlling the power cells to receive the input signal. In an embodiment, each of the plurality of power cells may be separately controllable by the controller. Further, a portion of the plurality of power cells may be arranged with parallel outputs. Additionally, at least one of the plurality of cells may include one or more switched capacitors. In another embodiment, the at least one of the plurality of cells may include at least one switched capacitor and a DC/DC regulating converter.
Abstract:
A switching power supply includes: a rectifier for generating an output between first and second polarity terminals; a first capacitor connected in parallel to the first and second polarity terminals of the rectifying circuit; an inductor connected to one polarity terminal at one end; second and third circuits connected to and in parallel to the other end and the second polarity terminal; a transformer including primary and secondary windings; and a smoothing circuit connected to the secondary winding. The first circuit includes first and second switches connected in series. The second circuit includes a third switch and a second capacitor connected in series; the third circuit includes the primary winding and a third capacitor connected in series and is connected in parallel to the second switch. In a method of switching the third switching element is turned off while the first and second switching elements are simultaneously turned on.