A filter for an electric machine is disclosed. The filter has an inductor, which is a coil, and a capacitor. The coil has multiple windings, and each turn of the windings includes at least one conductor which is designed to be flat. By virtue of the flat conductor of the coil, the capacitance of the filter is thus formed in the coil itself In the process, the surface of one conductor is arranged opposite the surface of an adjacent conductor.

An isolated power supplies converts an input power source in a primary side into an output power source in a secondary side, capable of transmitting a signal from the secondary side to the primary side via a transformer. The transformer has a primary winding connected with a main switch, and a secondary winding connected with a secondary-side switch. A primary-side controller controls the main switch. A secondary-side controller controls the secondary-side switch and detects a demagnetization time of the transformer. Before the end of the demagnetization time, the secondary-side controller turns OFF the secondary-side switch to signal, via the transformer, the primary-side controller, which in response turns ON the main switch to operate the isolated power supply in a continuous-conduction mode or in a boundary mode.

An isolated DC-DC converter includes a non-isolated DC-DC converter as a primary side. The non-isolated DC-DC converter includes a first inductor, a switch controller, and first and second switches. The non-isolated DC-DC converter is configured to receive an input voltage. The non-isolated DC-DC converter also includes a secondary side including a second inductor, a full wave rectifying circuit, and a filter circuit. The second inductor in the secondary side is coupled with the first inductor in the primary side to define a transformer. The secondary side is electrically isolated from the primary side by the transformer and is configured to output a DC voltage based on a voltage induced in the second inductor via the transformer.

The present invention relates to a system and method for the monitoring and detection of insulation degradation in electric systems. The system comprises a controller for an electric motor (3), including input circuitry (2a) for connecting the controller to a power supply (1), power conversion circuitry (2b) for providing a power output for the electric motor (3), and sensing circuitry (2c) for monitoring a current inside the controller that is representative of a return leakage current from the electric motor to the motor controller. A condition of the insulation may be determined based on the monitored current.

A dual-input power conversion system includes a first primary side power network comprising a first hold-up capacitor, wherein the first primary side power network has inputs configured to be coupled to a first power source, and outputs coupled to a transformer, a second primary side power network comprising a second hold-up capacitor, wherein the second primary side power network has inputs configured to be coupled to a second power source, and outputs coupled to the transformer, and a secondary side power network having inputs coupled to a secondary side of the transformer, and outputs coupled to a load, wherein the first primary side power network and the second primary side power network are configured such that a voltage across one of the first hold-up capacitor and the second hold-up capacitor is maintained by a voltage reflected from the secondary side to a corresponding primary side.

A power converter includes: a switching transistor, a transformer, a control circuit; the control circuit is configured to determine a target voltage in a process that the switching transistor is driven to conduct; the target voltage can represent a voltage change of an input terminal of the switching transistor; when the target voltage starts to drop but is higher than a reference voltage, drive a control terminal of the switching transistor with a first driving current; when the target voltage decreases to be lower than the reference voltage, drive the switching transistor with a second driving current; the second driving current is higher than the first driving current; the switching transistor is driven by the first driving current for part or all of the time before entering the Miller plateau stage, and is driven by the second driving current after starting to enter the Miller plateau stage.

A dual-input power conversion system includes a first primary side power network coupled between a first ac power source and a first primary winding of a transformer, a second primary side power network coupled between a second ac power source and a second primary winding the transformer, a secondary side power network coupled to a secondary side of the transformer, and a power converter coupled between the secondary side power network and a load.

A switching mode power supply preventing a first switch from being falsely triggered. The switching mode power supply detects a peak of an input signal and starts timing a period of time since the arrival of the peak of the input signal is detected. The first switch starts performing the on and off switching operations when the period of time expires.

Apparatus for power conversion are provided. One apparatus includes a power converter including an input circuit and an output circuit. The power converter is configured to receive power from a source for providing power at a DC source voltage V.sub.S. The power converter is adapted to convert power from the input circuit to the output circuit at a substantially fixed voltage transformation ratio K.sub.DC=V.sub.OUT/V.sub.IN at an output current, wherein V.sub.IN is an input voltage and V.sub.OUT is an output voltage. The input circuit and at least a portion of the output circuit are connected in series across the source, such that an absolute value of the input voltage V.sub.IN applied to the input circuit is approximately equal to the absolute value of the DC source voltage V.sub.S minus a number N times the absolute value of the output voltage V.sub.OUT, where N is at least 1.

An electrical power converter with segmented windings is provided. Comprises a transformer or autotransformer including a magnetic core (3) and at least a primary winding (51) and at least a secondary winding (52) arranged around the magnetic core (3). The primary winding and/or the secondary winding have at least one full turn that includes at least one power switch (10) and at least one capacitor (12) connected in series and arranged respectively opposite each other and facing opposite sides of the magnetic core, defining a cell (4) that is divided in four segments, a first segment (23) including said at least one switch, a second opposite segment (24) including said at least one capacitor, and two other connecting segments (21, 22) providing electrical connection between the first segment and the second segment, and each of said two other connecting segments having opposite electrical polarity.