A cascaded architecture composed of interconnected blocks that are each designed to process constant power and eliminate bulk energy storage are provided. Further, local controls within each block natively achieve both block- and system-level aims, making the system modular and scalable. Further methods of providing power conversion using such interconnected clocks are also provided.

A motor drive system includes a power source unit configured to supply DC power to a DC link, a servo-amplifier for drive configured to convert the DC power in the DC link into AC power and supply the AC power as drive power to a servomotor for drive, a power storage device configured to store the DC power from the DC link or supply the DC power to the DC link, a power consumption calculation unit configured to calculate total power consumption as the sum of power consumed by the servomotor for drive, the servo-amplifier for drive and the power source unit, and a power storage device control unit configured to control power storage and power supply of the power storage device according to the total power consumption, wherein the power storage device control unit determines start and end of power storage or power supply, based on different thresholds.

A resonance power conversion device includes a bridge circuit, a transformer, a current detection circuit, and a control circuit. The bridge circuit includes a plurality of switching elements and receives a DC power. The transformer is connected to an output side of the bridge circuit. The current detection circuit detects a value of a current flowing through at least one of the plurality of switching elements. The control circuit determines whether or not an abnormality is occurring in the resonance power conversion device, based on the value detected by the current detection circuit at a predetermined time during a switching control.

An electrified vehicle capacitor assembly including a film capacitor assembly and a support structure is provided. The film capacitor assembly may include a stack of alternating electrodes and film layers. The electrodes may be offset from one another to alternatively contact opposing terminals. The support structure may include coolant channels and may be arranged to orient the film capacitor assembly adjacent an inverter assembly and such that each is in conductive thermal communication with at least one of the coolant channels. The film capacitor assembly further includes a stack of alternating metal foils and film layers disposed between a pair of contact layers, a pair of terminals, and a first thermal plate. Each of the pair of terminals is disposed on an outer side of one of each of the pair of contact layers.

A device for protecting an inverter include a first power switch configured to be turned on when a first voltage signal from a first switch of a safety relay is applied thereto; a second power switch connected in series with the first power switch, wherein the second power switch is configured to be turned on when a second voltage signal from a second switch of a safety relay is applied thereto; and a power line for connecting the first power switch and the second power switch to each other in series and for connecting the series of the first power switch and the second power switch to a buffer of the inverter, wherein a third voltage signal is applied via the power line to the buffer.

A drive circuit for an electromagnetic brake is used in a circuit including a motor, a converter converting a DC voltage into an AC voltage to be generated between a pair of DC link buses, and an inverter converting the DC voltage into an AC voltage and driving the motor. A full-bridge circuit has a pair of power supply terminals connected to the pair of DC link buses, and a pair of output terminals connected to the electromagnetic brake.

The invention relates to a device for converting voltage comprising a converter and a controller, wherein the converter has three half bridges, each with four transistors, and at least one half bridge has two switching elements, wherein by means of a first switching element, a central tap between two diodes is connected in a first switched position to a neutral point of a DC link capacitor and, in a second switched position, to a positive charging connection for an external DC voltage source, and by means of a second switching element, a central tap of the half bridge is connected in a first switched position to a pole of an AC voltage connection, and in a second switched position to a negative pole of a DC voltage connection. Moreover, the invention relates to a traction network as well as a method for charging a battery of a traction network by means of an external DC voltage source.

A control unit of a power conversion device calculates a current target value and a voltage target value for a DC/AC converter on the basis of an output current target value, to control the DC/AC converter, and calculates a current target value for the DC/DC converter on the basis of the current target value and the voltage target value, and a voltage target value for the DC/DC converter, to control the DC/DC converter, thereby controlling output of an AC power. The control unit selects, as the voltage target value for the DC/DC converter, a greatest value at a present time, from among a DC voltage value of the DC power supply, an absolute value of a voltage target value for an AC side of the DC/AC converter, and a DC voltage lower limit value which is a predetermined value smaller than a peak value of the absolute value.

A track-bound vehicle converter comprises a block-wave generator (20) configured to be connected to a direct voltage source (21) and connected to a series resonance link (34), or to an inductive link, for providing the input of a direct converter (41) with semi sinusoidal current pulses. The direct converter has at least one phase leg (42-44) having on one hand one switch (45-47) connected to the link (34) and able to block voltages in both directions thereacross and conduct current in both directions therethrough and on the other a capacitor (48-50) connected in series therewith. The voltage across the capacitor (48-50) of the direct converter is used to provide a converter output with an alternating voltage.

The invention relates to a device for converting voltage comprising a converter and a controller, wherein the converter has three half bridges, each with four transistors, and at least one half bridge has two switching elements, wherein by means of a first switching element, a central tap between two diodes is connected in a first switched position to a neutral point of a DC link capacitor and, in a second switched position, to a positive charging connection for an external DC voltage source, and by means of a second switching element, a central tap of the half bridge is connected in a first switched position to a pole of an AC voltage connection, and in a second switched position to a negative pole of a DC voltage connection. Moreover, the invention relates to a traction network as well as a method for charging a battery of a traction network by means of an external DC voltage source.