US 7,547,987 B2Granted

EMI reduced power inverter

AssigneeHitachi, Ltd.

InventorsMakato Torigoe, Liang Shao, George Saikalis, Hiroki Funato, Takayoshi Nakamura

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Abstract

A power inverter of the type used with hybrid electric vehicles having a circuit board with a power layer having a first and second section which are electrically separated using slits from each other on the power layer. A control circuit is connected to and powered by the first section of the power layer while a switching power supply is connected to and powered by the second section of the power layer. An electromagnetic filter is electrically connected between the sections of the power layer. This electromagnetic filter blocks high frequency noises of the type generated by the switching power supply while enabling the sections to be maintained at the same DC voltage level. Optionally, a ferrite covering is provided around a current bus bar of the power inverter to contain magnetic fields generated by current flow through the bus bar.

Claims13

Dependent claims

A power inverter comprising:

a printed circuit board having at least one power layer with at least a first and a second section, said sections being electrically separated from each other on said power layer and maintained at different voltages in operation,
a circuit component connected to and powered by said first section of the power layer,
a PWM switching power supply mounted in and powered by said second section of the power layer,
an electromagnetic filter electrically connected between said sections of said power layer, said filter configured to block at least a portion of high frequency signals between said sections while enabling said sections to be maintained at the same DC voltage level, wherein said printed circuit board comprises:
a ground layer having a first section and a second section electrically separated from each other on said ground layer,
a load circuit, functioning as control or signal conditioning, connected to said first section of the ground layer,
a PWM switching power supply module connected to said second section of the ground layer,
a second electromagnetic filter electrically connected between said sections of said ground layer, said filter configured to block a portion of high frequency noise from said sections of the ground layer while enabling said sections to be maintained at the same DC voltage level.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/425,751Filed 22 Jun 2006
Published: US 2007/0296271 A127 Dec 2007
Granted: 16 Jun 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02M 1/44
Details of apparatus for conversion: circuits or arrangements for compensating for electromagnetic interference in converters or inverters
H02M 7/003
Conversion of AC power input into DC power output; Conversion of DC power input into AC power output: constructional details, e.g. physical…
B60L 2270/147
Of noise: electro magnetic [EMI]
H02M
Apparatus for conversion between ac and ac, between ac and dc, or