368 results about "Stray inductance" patented technology

The invention particularly relates to a high-power converter based on parallel IGBT (insulated gate bipolar transistor) modules, belonging to the technical field of power electronic. Metal-film capacitors of the high-power converter adopt the high-power converter structure of a heteropolarity manner; and the polarities of the capacitors are staggered with each other. The high-power converter is featured with symmetrical circuit structure, good module current equalizing effect and low loop stray inductance so that the high-power converter is convenient for cascading chain joint modules so as to realize large power application. According to the invention, the problems that the capacity of the single IGBT module cannot meet the requirements of the high-power converter, and the current equalization of the parallel IGBT modules are solved.

The invention discloses a high power IGBT module operation junction temperature on-line detection system and a detection method thereof. The system utilizes the largest collector current droop rate of an IGBT module with approximately linear negative temperature dependency as a device junction temperature sensing parameter, and based on the Kelvin emitter packaging concept of a current mainstream high power IGBT module, converts largest collector current change information into induced voltage information on device internal stray inductance in a turn-off process of the IGBT module. The system does not need extra high voltage passive auxiliary elements, starts capturing the induced voltage caused by the collector current change rate of the IGBT module when a driving circuit sends a turn-off signal, extracts a peak value, and possesses higher precision and instantaneity.

Bumps are formed on electrodes of semiconductor elements, and moreover, the semiconductor elements with the bumps are electrically connected to metallic members having installation members, whereby wiring lines are eliminated. Stray inductance and conduction resistance resulting from wiring lines can be reduced. A conventional dented connector and a projecting connector are eliminated by connecting the installation members to a second circuit board, thereby enabling an electronic circuit device of a power control system to be made compact.

The present invention relates to a method and a control system for driving a three-strand brushless, electronically commutated electric motor (2), wherein a line AC voltage (UN) is rectified and fed via a slim DC link (8) with minimum DC link reactance as a DC link voltage (UZ) to an inverter (10) that can be driven to supply and commutate the electric motor (2). A pulsating DC voltage (UG) initially generated by rectifying the line AC voltage (UN) is dynamically increased with respect to its instantaneous values by a step-up chopper (18) in such a manner that the resulting DC link voltage (UZ) with a reduced ripple always lies above a defined limit voltage (U18 / U1) over time. The control system consists of a network rectifier (6), a downstream slim DC link (8) with minimum DC link reactance and a controllable inverter (10) that can be supplied via the DC link and driven to commutate the electric motor (2). A step-up chopper (18) is integrated therein with a controller (20) designed in such a manner that, the pulsating DC voltage (UG) rectified by the network rectifier (6) is dynamically increased with respect to its instantaneous values in such a manner that the resulting DC link voltage (UZ) with a reduced ripple always lies above a defined limit voltage (U20 / U1) over time. Stray inductances (Ls1-Ls3) of the motor winding heads present in the electric motor (2) are used as inductor (L) for the step-up chopper (18).

In a low voltage, high current power supply having very fast transitions of the load current, as in certain power supplies for microprocessors, the circuit impedances, particularly the stray inductance of the connector, are a major problem. If the voltage regulator circuits are separated from the output capacitor and brought to separate contacts in the connector, only connecting together on the load side, the voltage regulator will be much better able to overcome the connector impedance. The connector may be a printed connector, in which the metal surfaces of the internal layers of a multilayer printed circuit card are extended successively and mate with a similar complementary printed connector. To overcome high frequency effects, the power bus is a multilayer interleaved bus. Vias conduct the high frequency component of the current much more effectively at the edge of a stack of foil layers, so the power bus is strongly digitated to increase the periphery.

The invention provides a semiconductor device power module and belongs to the technical field of semiconductors. The power module comprises supporting structures which are arranged on the two sides and are used for fixing the power module, and a power component which is arranged between the supporting structures and extends along the longitudinal direction. The power component comprises a plurality of semiconductor devices which are press-fit through a press fitting mechanism. Each semiconductor device comprises an IGCT (Integrated Gate Commutated Thyristor), a clamping absorber diode, a neutral-point-clamped diode and a freewheel diode. The semiconductor device power module provided by the invention has the advantages that the electrical performance is excellent, the potential of an IGCT device is fully realized, the structure is compact, the stray inductance is small, the heat dissipation capability is strong, the power module is easy to maintain and the like.

The invention relates to a water-cooling power module of a medium-voltage high-power frequency changer, in particular to a uniphase H-bridge power unit of a series-wound H-bridge multi-level inverter, and belongs to the technical field of electric propulsion. The water-cooling power module of the medium-voltage high-power frequency changer comprises a module framework, a positive power component, a negative power component, two water-cooling inductances, two water-cooling resistances, five sets of high-voltage large-current connector, a power module, a power conversion terminal, a photoelectricity connector and sliding rails, wherein the five sets of high-voltage large-current connector are used for providing channels for the module to input and output current. The positive power component and the negative power component are respectively positioned on the top of the module and on the bottom of the module, and are installed fixedly and symmetrically on the framework by means of a T-shaped water-cooling heat dissipation plate inside the power components. Two water division pipes used for allowing water of the T-shaped water-cooling heat dissipation plate to passing in and out are directly installed on the framework at the right front portion of the module. The module is installed in a cabinet body by means of the pair of precise heavy-load sliding rails. The water-cooling power module of a medium-voltage high-power frequency changer has the advantages of being low in stray inductance, large in power density, compact in structure, capable of being maintained from the front side, high in reliability, good in maintainability and the like, and capable of being used in the medium-voltage high-power propulsion frequency changer.