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Power module for inverter switching devices having gate coils shielded from eddy currents

A power module, eddy current technology, used in electric solid devices, AC power input conversion to DC power output, electrical components and other directions

Active Publication Date: 2018-07-20
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Power module for inverter switching devices having gate coils shielded from eddy currents
  • Power module for inverter switching devices having gate coils shielded from eddy currents
  • Power module for inverter switching devices having gate coils shielded from eddy currents

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Embodiment Construction

[0052] Common source inductance is the inductance shared by the main power loop and the gate drive loop for transistor switching devices. Common source inductance typically comes from parasitic inductance associated with the device package and traces on the printed circuit board. In the case of switching bridges for DC to AC power conversion, the presence of common source inductance is beneficial. figure 1 An example of a phase leg 10 of the type commonly used in an inverter drive system in an electric vehicle driving an electric motor is shown, where the upper transistor 11 is shown as an IGBT with upper gate, collector, and emitter terminals. Other types of semiconductor devices, such as MOSFETs, may also be used. As used herein, the gate, collector, and emitter terminals of an IGBT also refer to the gate, drain, and source terminals of a MOSFET. A lower transistor 12 having lower gate, collector, and emitter terminals is connected in series with an upper transistor 11 bet...

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PUM

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Abstract

An inverter for an electric vehicle drive has a bridge configuration using power transistors packaged in actively cooled power modules. Control electrodes in the power modules carrying gate signals todrive the transistors contain inductive coils to increase a common source inductance in order to reduce power losses. Each inverter power module comprises a pair of transistor dies with output electrodes defining a power loop. The control electrodes with inductive coils carrying respective gate signals are arranged to be magnetically coupled with the power loop. For active cooling, a heat conductive plate underlies the dies. A magnetic interrupter is disposed at the heat conductive plate. A localized eddy current preventer is interposed at the heat conductive plate in alignment with the inductive coils to avoid eddy currents that could otherwise reduce the coupling of the inductive coils with the power loop.

Description

technical field [0001] The present invention relates generally to power switching devices in inverter bridges, and more particularly, to inverter drive systems for electric vehicles using discrete power switching circuits with structures that increase common source inductance. Background technique [0002] Electric vehicles such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and a battery electric vehicle (BEV) are driven using an inverter. motor to provide traction torque. A typical electric drive system may include a direct-current (DC) power source, such as a battery pack or a fuel cell, connected through a contactor switch to a variable voltage converter (VVC) to regulate the main DC link The main bus voltage across the circuit capacitor. An inverter is connected between the main bus and the traction motors to convert the DC bus power to an alternating current (AC) voltage that is connected to the motor windings to propel the vehicle. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00H01L23/367
CPCH01L23/3672H02M7/003H05K7/20927H01L2224/40245H01L2224/48091H01L2224/48137B60L15/007B60L3/003B60L2210/40H01L25/072H01L2924/181Y02T10/64Y02T10/72H01L2224/48247H01L2224/0603H01L2924/19107H05K7/14329H01L2924/00014H01L2924/00012H02M7/44H01L25/07H05K7/1432
Inventor 徐竹娴雷光寅陈清麒
Owner FORD GLOBAL TECH LLC
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