The invention comprises a method for manufacturing an inductor, comprising the steps of: casting a first cast winding section; casting a second cast winding section; and mechanically coupling the first cast winding section to the second cast winding section to form a section of a winding about a core of the inductor. Optionally, a first end of a connector section is welded to the first cast winding section and a second end of the connector section is welded to the second cast winding section, where the first and second cast winding sections have a common cast shape.

A rectifier has at least three outputs at which the rectifier provides a high potential, a low potential and at least one medium potential. Phase voltages of a supply grid can be supplied to the rectifier via feed lines. Inductors are arranged in the feed lines. A clamping circuit has two diode circuits that are connected in series. One of the end points of the series circuit is connected to an output at which the rectifier provides one of the medium potentials. The other end point is connected to another output. The node is connected to a reference potential via an overall capacitor circuit.

The invention comprises a method, including the steps of: providing an inductor core and longitudinally joining a first electrical turn section to a second electrical turn section to form at least part of an electrical turn of a winding about the inductor core and optionally including at least one of the steps of: (1) additive manufacturing, casting, stamping from metal stock, cutting material, and/or bending metal to form the first electrical turn section and/or (2) welding and/or mechanically joining the first electrical turn section to the second electrical turn section.

A rectifier circuit includes a first diode-connected transistor coupled to a first voltage terminal and a second diode-connected transistor coupled to a second voltage terminal. A switch network is coupled between the first diode-connected transistor and the second diode-connected transistor. The switch network has a first switch network terminal adapted to be coupled to a first terminal of a secondary winding of a transformer and has a second switch network terminal adapted to be coupled to a second terminal of the secondary winding of the transformer.

Described herein is a multi-level power convertor and a method for a multi-level power convertor. The multi-level power convertor includes a DC port; an AC port; a first power converting unit, a second power converting unit, a coupling inductor, and an inductive filtering unit. The first power converting unit is coupled to the DC port and includes a first AC terminal adapted to provide a first plurality of voltage levels. The second power converting unit is coupled to the DC port and includes a second AC terminal adapted to provide a second plurality of voltage levels, where the second plurality of voltage levels are phase-shifted by 90 degrees with respect to the first plurality of voltage levels. The coupling inductor includes first and second windings with a same number of turns. The inductive filtering unit is arranged between the AC port and ends of the first and second windings.

An EMI filter for an inverter may include a choke including a magnetic inner core, a magnetic outer core, and at least one conductor pair. The at least one conductor pair may include an electrically conductive positive conductor and an electrically conductive negative conductor. The inner core, the outer core, the positive conductor, and the negative conductor may extend along a longitudinal central axis of the choke. The inner core may be arranged in the outer core. The positive conductor and the negative conductor may be arranged between the inner core and the outer core. The positive conductor and the negative conductor may be arranged spaced apart from one another in a circumferential direction extending around the longitudinal central axis. A gap may be formed between the inner core, the outer core, the positive conductor, and the negative conductor, which are adjacent in the circumferential direction.

A control device for a power conversion apparatus and a resistor for a power conversion apparatus that can suppress a cross current between a plurality of power converters. A control device for a power conversion apparatus includes, in a state that AC sides of a plurality of power converters are connected in parallel without DC sides of the plurality of power converters being connected in parallel: a voltage recognition unit configured to recognize a voltage to ground on a DC side of a power converter, being an object to be controlled; and a controller configured to control, based on the voltage to ground on the DC side recognized by the voltage recognition unit, a DC voltage of the power converter, being the object to be controlled, such that the voltage to ground on the DC side of the power converter, being the object to be controlled, is further reduced.

The invention comprises a method for forming an inductor, comprising the steps of: providing an inductor core and fastening at least ten sections of a winding together to form a winding, the winding comprising a formed wound shape about the inductor core. Optionally and preferably the step of fastening repeats steps of joining a member of a first set of winding parts to an element of a second set of winding parts, where the two sets of winding parts have different cast or formed shapes.

An in-vehicle motor-driven compressor includes a common mode choke coil including an annular core having a through-hole, a first winding and a second winding wound around the core, and an annular conductor. The second winding is opposed to the first winding while being spaced apart from the first winding. The conductor surrounds the first and second windings, and the core. The conductor includes sections opposed to each other with the through-hole in between. The core is symmetrical with respect to at least one symmetry axis when the through-hole is viewed from the front. The first winding is located on one side of the at least one symmetry axis, and the second winding is located on the other side of the symmetry axis, so that the at least one symmetry axis is located between the first and second windings. The core includes an exposed section not covered with the conductor.

A current limiting circuit of a switching circuit, and a switching circuit are provided. The switching circuit uses a gallium nitride (GaN) power transistor as a main power transistor. The current limiting circuit includes a first terminal connected with a drain of the GaN power transistor, and a second terminal connected with a controller of the switching circuit. The current limiting circuit is configured to limit a current flowing out of a power supply terminal of the controller. The current limiting circuit suppresses a negative current flowing through the controller.