JP2009027901A - Power conversion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power conversion device for integrating an inverter body with a cooling system and suppressing propagation of vibration generated from the periphery of an inverter. <P>SOLUTION: An inverter device 100 includes: an IPM 26 which is a power module; a DC/DC converter 22; a reactor 24; a control substrate 28; a capacitor 20; a first cooler 30; a second cooler 40; a first radiator 11; a second radiator 12; a water pump 44; a reservoir tank 42; and a cooling fan 52, and an inverter case 60 is composed of upper and lower parts. Moreover, on an upper surface of the first cooler 30, the DC/DC converter 22 and the reactor 24 are disposed, and on a lower surface of the first cooler 30, the IPM 26 is disposed which is relatively large in calorific value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power conversion device including a case in which an inverter and a converter are integrally stored, and cooling means for circulating the refrigerant to cool the inverter and the converter.

  In recent years, fuel cell vehicles, electric vehicles, and the like have been developed, including hybrid vehicles that use an engine and an electric motor as power sources. Here, in addition to the engine, the hybrid vehicle or the like includes a DC power source such as a battery, a converter that boosts the battery voltage, and an inverter that converts the boosted power into AC power and rotates the motor. .

  In such a hybrid vehicle, in addition to the engine, a power element and a function for driving the power element are detected, and an overpower, overcurrent, overvoltage, etc. are detected, and an IPM (Intelligent Power Module) which is a component having a self-protection function. It is necessary to cool power converters such as inverters and converters including an appropriate temperature.

  However, since the temperature of the engine cooling water generally rises to about 110 ° C., when the engine cooling water is used as it is for cooling the power conversion device, the power element used in the power conversion device is a general silicon system. Therefore, it is difficult to share the engine cooling water and the cooling water of the power conversion device as a result.

  Therefore, Patent Document 1 discloses a configuration of a cooling system in which a coolant for the engine, the motor generator, and the inverter is shared in a vehicle drive system that includes an engine, a motor generator, and an inverter that controls the motor generator. A technique for cooling engine cooling water with a radiator is shown.

  FIG. 4 shows a configuration of an inverter device 200 as an example of the power conversion device disclosed in Patent Document 1. The inverter device 200 roughly includes an inverter case 60 and a radiator 10. Further, inverter case 60 includes boost converter 14, inverter 16, motor generator ECU 18 (hereinafter referred to as MG-ECU), capacitor 20, and cooler 30 for cooling them. .

  The inverter device 200 is supplied with cooling water from the engine to the refrigerant path 32. The radiator 10 of the inverter device 200 cools the cooling water supplied from the refrigerant path 32 and supplies the cooled cooling water to the cooler 30 via the refrigerant path 34. The cooler 30 cools the boost converter 14, the inverter 16, the MG-ECU 18, and the capacitor 20 using cooling water, and discharges it from the refrigerant path 36. By using such an inverter device 200, engine cooling water of about 110 ° C. is cooled to about 65 ° C. by the radiator 10, so that it can be used for cooling the inverter device 200 that is a power conversion device. .

  In recent years, an increase in the output of an inverter device has been demanded in order to improve the running performance of hybrid vehicles. For this reason, the vibration level of vibration generated from an electric element such as a reactor incorporated in the inverter tends to increase. Therefore, Patent Document 2 discloses a technique related to an inverter that can suppress vibration from an electric element serving as a vibration source from propagating to the outside.

JP 2006-264473 A JP 2005-32830 A

  By using the technology of Patent Document 1 described above, it is possible to cool the inverter device, which is a power conversion device, using the cooling water from the engine, but there are considerations such as introduction of outside air to the cooling water piping and the radiator. Necessary. In addition, it is necessary to suppress the propagation of vibrations generated from the periphery of the inverter that controls the high-voltage AC power and to consider sufficient cooling.

  Then, the power converter device which concerns on this invention aims at providing the power converter device which can suppress the propagation of the vibration which unifies an inverter main body and a cooling system, and generate | occur | produces from an inverter periphery.

  In order to achieve the above object, a power conversion device according to the present invention includes a case in which an inverter and a converter are integrally stored, and cooling means for circulating the refrigerant to cool the inverter and the converter. In the power conversion device, the cooling means includes a first cooler that circulates the refrigerant by a pump and exchanges heat with the heat generating portions of the inverter and the converter, and a first cooler that cools the refrigerant heated by the first cooler. A refrigerant flows in the order of a radiator and a second radiator provided on the downstream side of the first radiator, and air cooling means for cooling these devices with air. The inverter and the converter face each other. It is arrange | positioned between a 1st radiator and a 2nd radiator, and is cooled by a refrigerant | coolant and air cooling, It is characterized by the above-mentioned.

  In the power conversion device according to the present invention, the air cooling means cools the heat generating portions of the inverter and the converter and the first radiator with the air that has passed through the second radiator.

  Further, in the power conversion device according to the present invention, the cooling means further includes a second cooler between the first radiator and the second radiator.

  In the power converter according to the present invention, the first radiator and the second radiator are further provided with adjusting means for adjusting the cooling performance.

  Although it is necessary to consider the introduction of outside air by using the present invention, power conversion that integrates the inverter main body, which is a power converter, and a cooling system, and can suppress the propagation of vibration generated from the periphery of the inverter. An apparatus can be provided.

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

  FIG. 1 shows a configuration of an inverter (hereinafter referred to as an inverter device) that is a power conversion device. In addition, the same code | symbol is provided to the part same as a conventional structure, and duplication description is abbreviate | omitted. Here, the inverter device 100 roughly includes an electronic element part, a cooling part, and an inverter case 60. Here, the electronic element unit includes an IPM 26 that is a power module, a DC / DC converter 22, a reactor 24, a control board 28, and a capacitor 20.

  The cooling unit includes a first cooler 30, a second cooler 40, a first radiator 11, a second radiator 12, a water pump 44, a reserve tank 42 in which cooling water is stored, an air cooling The first radiator 11 and the second radiator 12 are provided with flow path regulating valves (not shown) for controlling the flow rate. The water pump 44 is driven by the output of the DC / DC converter 22.

  The inverter case 60 is composed of an upper part and a lower part. The upper part of the inverter case 60 covers the DC / DC converter 22 and the reactor 24 which is a so-called winding transformer. This cover prevents vibration from propagating from the reactor 24 that generates vibration, and the lower portion of the inverter case 60 protects the lower surface of the second cooler 40.

  A DC / DC converter 22 and a reactor 24 are disposed on the upper surface of the first cooler 30, and an IPM 26 having a relatively large amount of heat generation is disposed on the lower surface of the first cooler 30. The outside air and the vehicle interior air sucked from the duct 50 on the right side of FIG. 1 by the fan 52 cools the second radiator and cools the IPM 26, the control board 28, and the capacitor 20. The outside air / vehicle interior air that has cooled them cools the first radiator and is exhausted to the left in FIG. A control board 28 is disposed between the IPM 26 and the capacitor 20, and the capacitor 20 is provided on the upper surface of the second cooler 40.

  FIG. 2 shows the cooling water temperature of each refrigerant path in the inverter device, and the change in the cooling water temperature will be described with reference to FIGS. 1 and 2. From the left side of FIG. 2, the coolant temperature from the reserve tank 42, the first cooler 30, etc. to the second radiator 12 and the reserve tank 42 is shown.

  In the reserve tank 42 (A) in FIG. 2, the water temperature is the lowest, and in the first cooler 30 (B), the DC / DC converter 22, the reactor 24, and the IPM 26 that generates a relatively large amount of heat compared to these are used. The water temperature rises due to heat conduction and becomes the highest water temperature. This cooling water is sucked into the water pump 44 (C) through the rubber hose 45, and the cooling water discharged from the water pump 44 is similarly sent to the first radiator through the rubber hose 46. The pulsation generated by the water pump 44 is absorbed by the rubber hoses 45 and 46.

  In the first radiator 11 (D), the water temperature is lowered by air cooling by the fan 52. The cooling water whose water temperature has decreased is sent to the second cooler 40 (E). Here, although the water temperature rises again due to heat conduction from the condenser 20, it is returned to the initial water temperature by being air-cooled again by the second radiator (F).

  FIG. 3 shows two changes in the temperature in the case of the inverter device. Pattern 1 in the figure is when the outside air / vehicle interior temperature is low, and pattern 2 is when the outside air / vehicle interior temperature is high. One of the characteristic matters of the present invention is that the cooling capacity is varied by adjusting the flow path lengths of the second radiator and the first radiator in accordance with the outside air / interior temperature of the vehicle interior, so that each electronic component It is possible to reduce the temperature change.

  As shown in pattern 1 of FIG. 3, when the outside air / vehicle interior temperature is low, the cooling capacity of the second radiator is increased to increase the temperature of the electronic components, and the cooling capacity of the first radiator is decreased. Let In addition, when the outside air / vehicle interior temperature is high, the cooling capacity of the second radiator is lowered so that the temperature of the electronic components does not rise too much, and the cooling capacity of the first radiator is increased, thereby dissipating heat. Promote. Further, one of the characteristic matters of the present invention is that the cooling effect is improved by cooling the power module such as IPM by combining cooling water and air cooling.

  As described above, the use of this embodiment requires consideration of the introduction of outside air. However, the inverter main body, which is a power conversion device, and the cooling system are integrated, and vibration generated from the periphery of the inverter is propagated. Can be suppressed.

  In addition, although this embodiment demonstrated the inverter apparatus, it cannot be overemphasized that it can use for a power converter device which is not limited to an inverter apparatus and requires other heat generating measures.

It is the block diagram which showed the structure of the inverter apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the cooling water temperature of each cooling path in the inverter apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the change of the temperature in a case in the inverter apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the conventional power converter device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Radiator, 11 1st radiator, 12 2nd radiator, 14 Boost converter, 16 Inverter, 18 Motor generator ECU, 20 Capacitor, 22 DC / DC converter, 24 Reactor, 26 IPM, 28 Control board, 30 1st cooler, 32, 34, 36 Refrigerant path, 40 Second cooler, 42 Reserve tank, 44 Water pump, 45, 46 Rubber hose, 50 Duct, 52 Fan, 60 Inverter case, 100, 200 Inverter device.

Claims (4)

In a power conversion device comprising a case in which an inverter and a converter are integrally stored, and cooling means for circulating the refrigerant to cool the inverter and the converter,
The cooling means includes a first cooler in which the refrigerant is circulated by the pump and exchanges heat with the heat generating portions of the inverter and the converter, a first radiator that cools the refrigerant heated by the first cooler, and a first A second radiator provided on the downstream side of the radiator, and an air cooling means for cooling the devices with air, in which the refrigerant flows in this order,
An inverter and a converter are arrange | positioned between the 1st radiator and 2nd radiator which mutually oppose, and are cooled by a refrigerant | coolant and air cooling, The power converter device characterized by the above-mentioned. The power conversion device according to claim 1,
An air cooling means cools the heat generating part of an inverter and a converter, and the 1st radiator with the air which passed the 2nd radiator, The power converter characterized by things. The power conversion device according to claim 1,
The cooling means further includes a second cooler between the first radiator and the second radiator. The power converter according to any one of claims 1 to 3,
Further, the first and second radiators are provided with adjusting means for adjusting the cooling performance.

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