A power conversion device and a press apparatus capable of preventing an excessive current in a DC-link capacitor are provided. The power conversion device 10 includes a voltage-doubling rectifier circuit 12. In the voltage-doubling rectifier circuit 12, in a voltage-doubling rectification mode, a common connection node Nc between two capacitors 102a and 102b is connected to a predetermined node. A current detector circuit 107 detects a switching current (IL) flowing in the switching elements SW1 and SW2, and a current detector circuit 108 detects a load current Ild of a load 15. In a mode switching period from a full-wave rectification mode to a voltage-doubling rectification mode, a controller circuit 110 controls the switching of the switching elements SW1 and SW2, based on the switching current (IL) and the load current Ild.

Embodiments of present disclosure relates to a power factor correction circuit and an industrial robot. The power factor correction circuit has first and second AC terminals, first and second DC terminals, a first input inductor connected to the first AC terminal, a second input inductor connected to the second AC terminal, a first coupling inductor, configured to suppress a leakage current of the power factor correction circuit.

Embodiments of present disclosure relates to a power factor correction circuit and an industrial robot. The power factor correction circuit has first and second AC terminals, first and second DC terminals, a first input inductor connected to the first AC terminal, a second input inductor connected to the second AC terminal, a first coupling inductor, configured to suppress a leakage current of the power factor correction circuit.

A system comprises a first 3-phase rectifier having a positive DC lead and a negative DC lead and a second 3-phase rectifier having a positive DC lead and a negative DC lead. The system also includes a 4-phase, 3-level inverter connected to the first and second 3-phase rectifiers. A method comprises receiving variable frequency, 3-phase power from a first generator, receiving variable frequency, 3-phase power from a second generator, rectifying the variable frequency, 3-phase power from each of the first and second generators into DC power. And inverting the DC power into 4-phase, constant frequency power for powering a load.

Power converters with power factor correction circuits and controllers thereof that are configured to generate frequency-adjustable first and second pulsed signals having respective and complementary phases separated by an adjustable deadtime. For example, a power converter may be configured to receive an alternating current (AC) input signal and output a direct current (DC) output signal. The power converter may include a transformer and a power factor correction circuit. The power factor correction circuit may include: a first switching transistor and a second switching transistor in series with the first switching transistor; and a controller configured to generate first and second pulsed signals having respective and complementary phases and separated by an adjustable deadtime and apply the generated first and second pulsed signals to the first and second transistors, respectively. A primary side of the transformer may be coupled to a node between the first and second switching transistors.

An electronic device according to various embodiments of the present invention comprises: a receiving circuit for outputting an AC power received wirelessly; and a rectifier circuit for rectifying the AC power being output from the power receiving circuit. The rectifier circuit comprises a forward rectifier circuit and a reverse rectifier circuit. A first terminal of the forward rectifier circuit is connected to the receiving circuit and the reverse rectifier circuit, a second terminal of the forward rectifier circuit is connected to an output terminal, and the forward rectifier circuit comprises first transistors for rectifying the AC power during a first period. A first terminal of the reverse rectifier circuit is connected to the receiving circuit and the forward rectifier circuit, a second terminal of the reverse rectifier circuit is connected to a ground, and the reverse rectifier circuit can comprise second transistors for preventing the AC power from being transmitted to the forward rectifier circuit during a second period.

An electronic device according to various embodiments of the present invention comprises: a receiving circuit for outputting an AC power received wirelessly; and a rectifier circuit for rectifying the AC power being output from the power receiving circuit. The rectifier circuit comprises a forward rectifier circuit and a reverse rectifier circuit. A first terminal of the forward rectifier circuit is connected to the receiving circuit and the reverse rectifier circuit, a second terminal of the forward rectifier circuit is connected to an output terminal, and the forward rectifier circuit comprises first transistors for rectifying the AC power during a first period. A first terminal of the reverse rectifier circuit is connected to the receiving circuit and the forward rectifier circuit, a second terminal of the reverse rectifier circuit is connected to a ground, and the reverse rectifier circuit can comprise second transistors for preventing the AC power from being transmitted to the forward rectifier circuit during a second period.

A rectifier arrangement (20) for rectifying an AC voltage into a DC voltage has connections, circuit arrangements, an interconnection apparatus (26) and an intermediate circuit (50). The connections include first and second connections (22, 21). The intermediate circuit (50) has a first line (51), a second line (52) and at least one capacitor (61, 62) between the first and second lines (51, 52). The circuit arrangements (31, 32, 33, 34, 35, 36) each have a first circuit arrangement connection (A) and a second circuit arrangement connection (B), between which a changeover arrangement (92) and a coil (91) are connected in series. The interconnection apparatus (26) enables at least: a first configuration in which the first connection (22) is connected to at least one first circuit arrangement connection (A), and a second configuration in which the first connection (22) is connected to at least one second circuit arrangement connection (B).

A wind power converting device includes a plurality of grid-side converters, a plurality of generator-side converters and a plurality of DC buses. The grid-side converters are connected with each other in series and electrically coupled to a power grid. The generator-side converters are connected with each other in series and electrically coupled to a generator device. The DC buses are electrically coupled between the grid-side converters and the generator-side converters. The DC buses include a positive DC bus, a negative DC bus and at least one intermediate DC bus between the positive DC bus and the negative DC bus. A cross section area of a conductor of the intermediate DC bus is smaller than 30% of a cross section area of a conductor of the positive DC bus or smaller than 30% of a cross section area of a conductor of the negative DC bus.

The present application provides a power supply apparatus, a three-phase power supply system and a control method, including N modules, where N is a positive integer greater than or equal to 2, and each module includes: a transformer, including a primary winding and a first secondary winding; and a first switch unit connected to the first secondary winding of the transformer, where primary windings of transformers of the N modules are connected in series, the first switch unit operates in one of a bypass mode, an open-circuit mode and a modulation mode, an output of each module is controlled by the first switch unit, so as to make the power supply apparatus provide voltages of different amplitudes according to power demand, and transformers with large volume and heavy weight, such as a centralized line frequency transformer or a multiple-winding transformer, are no longer required.