Power conversion apparatus

Abstract

A power conversion apparatus is disclosed. In the case where a coil is arranged in a power module, the circuit system between the ends of the coil in the power module, regardless of where the coil is located, is structurally isolated and insulated from each other. This isolation and insulation prevents the capacitance from being created across the coil, and the coil can exhibits the effect as a filter, thereby improving the characteristics of a noise filter.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing a configuration of the power conversion apparatus according to an embodiment of the invention.

FIG. 2 is a diagram for explaining the power module.

FIG. 3 is a diagram for explaining another embodiment.

FIG. 4 is a diagram for explaining still another embodiment.

FIG. 5 is a diagram for explaining yet another embodiment.

FIG. 6 is a diagram for explaining a further embodiment.

FIG. 7 is a diagram showing an equivalent circuit of FIG. 6.

FIG. 8 is a diagram for explaining the structure of the power module according to the invention.

FIGS. 9A and 9B show the result of a noise test conducted according to the prior art.

FIGS. 10A and 10B show the result of a noise test conducted by a method according to the invention.

FIG. 11 is a diagram for explaining a case in which a coil is arranged in the power module.

FIG. 12 is a diagram for explaining the structure of the power module according to another embodiment.

FIG. 13 is a diagram for explaining the insulation in the case where a coil is arranged between the power input unit and the rectifier portion.

FIG. 14 is a diagram for explaining the insulation in the case where a coil is arranged between the rectifier portion and the inverter portion.

FIG. 15 is a diagram for explaining the insulation in the case where a coil is arranged between the inverter portion and the output unit of an induction motor.

FIG. 16 is a diagram for explaining the case in which a coil is arranged between the power input unit and the rectifier portion.

Claims

1. A power conversion apparatus comprising: a rectifier circuit for converting the supplied AC power to the DC power;a smoothing circuit for smoothing the output of the rectifier circuit;an inverter circuit for outputting by converting the output of the smoothing circuit into the AC power;a control circuit for controlling the inverter circuit according to the pulse width modulation scheme;a first substrate on which the rectifier circuit is mounted;a second substrate on which the inverter circuit is mounted;a support unit for supporting the first substrate and the second substrate integrally; andan EMi filter having a coil inserted between the rectifier circuit and the inverter circuit;wherein the first substrate and the second substrate are electrically isolated from each other.

2. A power conversion apparatus according to claim 1, wherein the first substrate and the second substrate integrated with each other have an insulating layer formed on the surface of a conductor, andwherein the conductor is electrically isolated.

3. A power conversion apparatus according to claim 1, wherein the first substrate and the second substrate integrated with each other have an insulating layer formed on the surface of a conductor, andwherein the insulating layer is electrically isolated.

4. A power conversion apparatus according to claim 1, wherein an insulating plastic material is arranged in the portion for electrically isolating the first substrate and the second substrate from each other.

5. A power conversion apparatus according to claim 4, wherein the plastic material is has the same height as the insulating layer.

6. A power conversion apparatus according to claim 1, wherein an EMi filter having a coil is arranged on the surface of the first substrate and the second substrate.

7. A power conversion apparatus according to claim 2, wherein the conductor is aluminum.

8. A power conversion apparatus comprising: a rectifier portion for converting the supplied AC power to the DC power;a smoothing portion for smoothing the output of the rectifier portion;an inverter portion for outputting by converting the output of the smoothing portion into the AC power; anda control portion for controlling the inverter portion according to the pulse width modulation scheme;wherein a first substrate having the rectifier portion and a second substrate having the inverter portion are formed integrally with each other and are electrically isolated from each other, andwherein an EMi filter having a coil is arranged between the rectifier portion and the inverter portion.

9. A power conversion apparatus according to claim 8, wherein the first substrate and the second substrate integrated with each other have an insulating layer formed on the surface of a conductor, andwherein the conductor is electrically isolated.

10. A power conversion apparatus according to claim 8, wherein the first substrate and the second substrate integrated with each other have an insulating layer formed on the surface of a conductor, andwherein the insulating layer is electrically isolated.

11. A power conversion apparatus according to claim 8, wherein an insulating plastic material is arranged in the portion for electrically isolating the first substrate and the second substrate from each other.

12. A power conversion apparatus according to claim 11, wherein the plastic material has the same height as the insulating layer.

13. A power conversion apparatus according to claim 8, wherein an EMi filter having a coil is arranged on the surface of the first substrate and the second substrate.

14. A power conversion apparatus according to claim 9, wherein the conductor is aluminum.