An interleaved bridgeless power factor correction (PFC) converter-based motor drive system is provided. The system includes a first inductor coupled to a second inductor. The coupled first and second inductors are coupled to a first input configured to be coupled to a first line of an alternating current (AC) power supply. The system also includes a third inductor coupled to a fourth inductor. The coupled third and fourth inductors are coupled to a second input configured to be coupled to a second line of the AC power supply. The system further includes a digital active power factor correction (PFC) controller configured to cause current in at least one of the coupled first and second inductors and the coupled third and fourth inductors to be interleaved.

A converter configured to supply an energy consuming element during an operating phase and may charge a capacitor during a pre-charging phase prior to the operating phase. The converter may have a power factor correction circuit having the capacitor and thyristors. The converter may also have a control system configured to control the pre-charging phase. The control system may have a control unit configured to, during the operating phase, detect the state of charge of the capacitor, and generate a control signal configured to control the thyristors as a function of the state of charge of the capacitor.

An AC-DC converter can include: a rectifying circuit configured to convert an AC input voltage into a DC voltage, where at least one active switching device is included in one conductive rectifying loop of the rectifying circuit; a control circuit configured to control switching states of the active switching devices according to an output voltage of the AC-DC converter and the AC input voltage, in order to decrease an error between the DC voltage and the output voltage of the AC-DC converter; and a DC-DC converter configured to convert the DC voltage into the output voltage of the AC-DC converter.

A short-circuit device and a protection method for a submodule for a power converter are disclosed. The submodule includes a bridge circuit having at least one power semiconductor branch extending between a first and a second DC voltage node and at least one controllable power semiconductor switch disposed therein to which a freewheeling diode is connected in anti-parallel, and a capacitor connected in parallel to the bridge circuit. The short-circuit device has at least one selected of the freewheeling diodes anti-parallel to the power semiconductor switches of the bridge circuit, wherein the at least one selected freewheeling diode is manufactured in press pack design and rated such that, when a fault occurs in the submodule, the at least one selected freewheeling diode breaks down due to the fault conditions and provides a durable, stable, low-impedance short circuit path between a first and a second AC voltage connection of the submodule.

A converter comprises a first switch, a second switch, a first blocking device and a second blocking device connected in series between two terminals of an output capacitor, an inductor coupled between a dc input source and a common node of the second switch and the first blocking device and a capacitor coupled between a common node of the first switch and the second switch, and a common node of the first blocking device and the second blocking device, wherein a voltage across the capacitor is configured to be adjustable through adjusting duty cycles of the first switch and the second switch.

A power factor correction circuit includes a rectifier that rectifies AC power supply voltage, a series circuit of an inductor and a semiconductor switch connected between the rectifier circuit output terminals, and a series circuit of a diode and a smoothing capacitor connected to both ends of the semiconductor switch, a load connected to both ends of the smoothing capacitor, so that the power factor on the input side of the rectifier circuit is corrected by the switching operation of the semiconductor switch. This power factor correction circuit includes a control circuit that controls the switching frequency of the semiconductor switch such that the switching frequency becomes maximum when the ripple of a current flowing through the inductor becomes maximum. According to this power factor correction circuit, normal mode noise can be reduced, and the size of a filter circuit can be decreased.

A power converting device, in one possible configuration, includes a chopper circuit with a first semiconductor switching device, a fast recovery diode, and an inductor of which one end is connected to a connection point connecting between the first semiconductor switching device and fast recovery diode; a series circuit, connected in parallel with the fast recovery diode, including a rectifying diode with a greater reverse recovery loss and a smaller forward voltage drop than those of the fast recovery diode, and a second semiconductor switching device. The second semiconductor switching device has a lower breakdown voltage and a smaller forward voltage drop than those of the first semiconductor switching device, is configured to turn on when the first semiconductor switching device is turned off, and is configured to turn off at a timing before the first semiconductor switching device shifts from an off-state to an on-state.

A power factor correction circuit includes: a coil and MOSFETs that boost an input voltage to generate a boosted voltage; a first capacitor having one end connected to a first output terminal, and the other end connected to an intermediate node; and a second capacitor having one end connected to the intermediate node, and the other end connected to a second output terminal. In a first operation mode, the boosted vol tage is applied to the two ends of the first capacitor when a positive voltage is input, and applied to the two ends of the second capacitor when a negative voltage is input. In a second operation mode, the boosted voltage is applied to two ends of the first and second capacitors connected in series. Thus, there is provided a power factor correction circuit which has a high efficiency and is compatible with an input voltage in a broad range.

According to one embodiment, there is provided a power converter including a totem-pole power factor correction circuit that can achieve reduction in recovery loss with a simple structure. A power converter according to an embodiment includes a totem-pole power factor correction circuit, a series connection of a first current detector and a second current detector, and a control circuit.

An arrangement for providing a vehicle, in particular a track bound and/or road vehicle, with electric energy, comprising a receiving device 1 adapted to receive an alternating electromagnetic field and produce an alternating electric current by electromagnetic induction. The receiving device comprises three phase lines, 2a, 2b, 2c, connected on one side to a common star point 5, and on the other side to a bridge rectifier 10. Each phase line includes an inductance 3a, 3b, 3c and a capacitance 4a, 4b, 4c having a resonant frequency. The rectifier comprises a number of controllable switches 12, 13 and a control device to switch the switches on and off at a frequency smaller than the resonant frequency. During operation the incident electromagnetic field induces a voltage in the inductances and a corresponding alternating current flows through the phase lines, is rectified by the rectifier, and is provided to the load 17.