Power converter
First Claim
1. A power converter for an AC generator for motor vehicles for converting a generated voltage of the AC generator driven by an engine into a DC voltage to feed to a battery, comprising at least one of:
- 1) a first group of high-side MOS power transistors for connecting an output end of an armature coil which generates said generated voltage with a high potential end of said battery; and
2) a second group of low-side MOS power transistors for connecting said output end with a low potential end of said battery, wherein;
said high-side and/or said low-side MOS power transistors each have a source region, a well region, and a drain region; and
each transistor in at least one of said first group and said second group of MOS power transistors has a high resistance connected in parallel with either a parasitic diode generated between said source region and well region or a parasitic diode generated between said drain region and well region for preventing conductance of current through said parasitic diode.
1 Assignment
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Accused Products
Abstract
A power converter for an AC generator for motor vehicles for converting a generated voltage of the AC generator driven by an engine into a DC voltage to feed to a battery includes at least either high-side MOS power transistors for connecting an output end of an armature coil which generates the generated voltage of the AC generator with a high potential end of a battery or low-side MOS power transistors for connecting the output end of the armature coil with a low potential end of the battery. The MOS power transistors each has a source region, a well region and a drain region. A high resistance connected with either a parasitic diode on the side connected with the source generated between the source region and well region or a parasitic diode on the side connected with the drain generated between the drain region and well region in parallel is formed in the MOS power transistors. Thereby, it allows blocking a reverse current produced by the parasitic diode and giving a necessary potential to the well region. Further, SiC is used in the MOS power transistors rather than Si.
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Citations
18 Claims
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1. A power converter for an AC generator for motor vehicles for converting a generated voltage of the AC generator driven by an engine into a DC voltage to feed to a battery, comprising at least one of:
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1) a first group of high-side MOS power transistors for connecting an output end of an armature coil which generates said generated voltage with a high potential end of said battery; and 2) a second group of low-side MOS power transistors for connecting said output end with a low potential end of said battery, wherein; said high-side and/or said low-side MOS power transistors each have a source region, a well region, and a drain region; and each transistor in at least one of said first group and said second group of MOS power transistors has a high resistance connected in parallel with either a parasitic diode generated between said source region and well region or a parasitic diode generated between said drain region and well region for preventing conductance of current through said parasitic diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification