Semiconductor module for a power conversion device
First Claim
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1. A power conversion device having a predetermined number of phases comprising:
- an intermediate node at a potential intermediate between potentials of a pair of d.c. terminals;
a.c. terminals equal in number to the number of phases of the power conversion device;
a plurality of arms each connected between one of said d.c. terminals and one of said a.c. terminals, each of said arms comprising two parallel circuits connected in series, each parallel circuit including a switching device and a diode opposite in conductive direction to said switching device; and
a plurality of diodes each connected between said intermediate node and a node between said two parallel circuits,wherein different lifetimes are set for said switching device and said diode of each of said parallel circuits to decrease power loss in the power conversion device,wherein lifetimes of said diodes and said switching devices are set to equalize recovery losses and forward voltage losses for said diodes, or switching losses and on-state voltage losses for said switching devices in the power conversion device.
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Abstract
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second switching device and a second diode, allowing a reduced size, high reliability, high frequency switching and low noise.
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Citations
19 Claims
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1. A power conversion device having a predetermined number of phases comprising:
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an intermediate node at a potential intermediate between potentials of a pair of d.c. terminals; a.c. terminals equal in number to the number of phases of the power conversion device; a plurality of arms each connected between one of said d.c. terminals and one of said a.c. terminals, each of said arms comprising two parallel circuits connected in series, each parallel circuit including a switching device and a diode opposite in conductive direction to said switching device; and a plurality of diodes each connected between said intermediate node and a node between said two parallel circuits, wherein different lifetimes are set for said switching device and said diode of each of said parallel circuits to decrease power loss in the power conversion device, wherein lifetimes of said diodes and said switching devices are set to equalize recovery losses and forward voltage losses for said diodes, or switching losses and on-state voltage losses for said switching devices in the power conversion device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14)
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12. A power conversion device having a predetermined number of phases comprising:
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a pair of d.c. terminals; an intermediate node at a potential intermediate between potentials of said pair of d.c. terminals; a.c. terminals equal in number to the number of phases of the power conversion device; a plurality of arms each connected between one of said d.c. terminals and one of said a.c. terminals, each of said arms comprising two parallel circuits connected in series, each parallel circuit including a switching device and a diode opposite in conductive direction to said switching device; and a plurality of diodes each connected between said intermediate node and a node between said two parallel circuits, wherein a lifetime control is applied to at least one of said diodes connected between said intermediate node and a node between said two parallel circuits so that a lifetime of said at least one diode connected between said intermediate node and a node between said two parallel circuits is shorter than a lifetime of at least one of said diodes of said parallel circuits coupled to one of said a.c. terminals to decrease switching loss and switching time, wherein lifetimes of said diodes and said switching devices are set to equalize recovery losses and forward voltage losses for said diodes, or switching losses and on-state voltage losses for said switching devices in the power conversion device. - View Dependent Claims (13)
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15. A power conversion device having a predetermined number of phases comprising:
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an intermediate node at a potential intermediate between potentials of a pair of d.c. terminals; a.c. terminals equal in number to the number of phases of the power conversion device; a plurality of arms each connected between one of said d.c. terminals and one of said a.c. terminals, each of said arms comprising two parallel circuits connected in series, each parallel circuit including a switching device and a diode opposite in conductive direction to said switching device; and a plurality of diodes each connected between said intermediate node and a node between said two parallel circuits, wherein a lifetime control is applied to at least one of said diodes of one of said parallel circuits coupled to one of said d.c. terminals so that a lifetime of said at least one diode of said parallel circuit coupled to the d.c. terminal is shorter than a lifetime of said diode connected between said intermediate node and a node between said two parallel circuits to decrease switching loss and switching time, wherein lifetimes of said diodes and said switching devices are set to equalize recovery losses and forward voltage losses for said diodes, or switching losses and on-state voltage losses for said switching devices in the power conversion device. - View Dependent Claims (16, 17)
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18. A power conversion device having a predetermined number of phases comprising:
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a pair of d.c. terminals; an intermediate node at a potential intermediate between potentials of said pair of d.c. terminals; a.c. terminals equal in number to the number of phases of the power conversion device; a plurality of arms each connected between one of said d.c. terminals and one of said a.c. terminals, each of said arms comprising two parallel circuits connected in series, each parallel circuit including a switching device and a diode opposite in conductive direction to said switching device; and a plurality of diodes each connected between said intermediate node and a node between said two parallel circuits, wherein lifetimes of the diodes and switching devices are set to equalize losses in the power conversion device. - View Dependent Claims (19)
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Specification