JP2000152655A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive power converter by preventing insulation deterioration through external air of electrical equipment components. SOLUTION: An air flow path 4, consisting of a cooling body 18 having a ventilation path 21 and ducts 31, 41, is provided through a casing 17, a ventilating fan 35, a DC reactor 34 and an AC reactor 44 are provided within ducts 31, 41, a semiconductor switch element 22 is loaded to the external surface of the cooling body 18 and electrical equipment components such as a drive control board 23 of the element 22 and capacitor 24 and a circuit breaker for a wiring 36 or the like are provided inside the casing 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a distributed power supply system, and more particularly to a power conversion device in a small-capacity distributed installation type photovoltaic power generation system having an independent operation function.

[0002]

2. Description of the Related Art A conventional power converter for photovoltaic power generation is shown in FIG.
This will be described with reference to FIG. In the figure, 1 is a housing, 2 is a ventilation filter below the front plate of the housing 1, 3 is a DC reactor for chopper, 4 is an AC reactor for filter, 5 is a filter capacitor, and 6 is an AC output electromagnetic contactor. And 7, a circuit breaker for DC input wiring, and 8 a circuit breaker for AC output wiring.

[0003] Reference numeral 9 denotes a duct provided in the rear portion of the casing 1 in the vertical direction, 10 denotes a cooling body provided as a cooling radiator provided in the duct 9, and 11 denotes an outer surface of the duct 9 close to the cooling body 10. The semiconductor switch element provided as
, A driving substrate 13 provided above and below the substrate 12, a control substrate 14 provided separately from the front of the driving substrate 12, and each electric device component It is mounted in the housing 1 by respective mounting means.

[0004] Reference numeral 15 denotes a duct fan provided at the lower entrance of the duct 9, and 16 denotes a ceiling fan for exhaust provided at the front of the lower surface of the top plate of the housing 1.
, The outside air from the ventilation filter 2 is drawn into the casing 1, and the air passing through the two reactors 3, 4 is drawn in from the lower part of the duct 9 by the duct fan 15, and cools the cooling body 10 through the duct 9. Then, the air from above the duct 9 and the air that has passed through the inside of the housing 1 by the ceiling fan 16
It is exhausted outside.

[0005] The conversion efficiency of the power converter for photovoltaic power generation is about 90%, and the remaining power is lost and becomes heat to heat the inside of the power converter.

[0006] In general, devices in the housing of the power converter are susceptible to heat, and it is necessary to suppress a rise in temperature in the housing by ventilation such as forced air cooling. Therefore, a problem is that dust, salt, moisture, and the like due to air cooling enter the housing.

In order to prevent the dust and the like from being sucked into the housing, a ventilation filter is effective. However, a filter having good ventilation filter performance has a large pressure loss, and tends to reduce the fan air volume. Therefore, in order to keep the inside of the housing clean, it is essential to increase the air volume of the fan and to provide a high-performance filter.

[0008]

In the case of the conventional power converter, a duct fan 15 for discharging heat of the reactors 3 and 4 is required in addition to the ceiling fan 16 for exhaust. Further, since the outside air is sucked into the housing 1 by the two fans 15 and 16, the electric device components in the housing 1 may be
The insulation deteriorates due to salt and moisture. In addition, a high-performance ventilation filter 2 must be used, and the airflow of both fans 15 and 16 must be increased due to pressure loss, resulting in high costs and a large external size. is there.

The present invention has been made in consideration of the above points, and is not necessarily limited to 2
A power conversion device that does not require individual fans, prevents outside air from passing through electrical equipment components other than the two reactors, prevents insulation degradation of electrical equipment components due to external air, uses inexpensive filters and fans, and prevents large size. The purpose is to provide.

[0010]

According to a first aspect of the present invention, there is provided a power conversion device, comprising: a ventilation passage formed by a cooling body having a ventilation passage and a duct; A ventilation fan, a DC reactor and an AC reactor are provided in the duct, a semiconductor switch element is mounted on an outer surface of the cooling body, and a drive control board for the element and a capacitor, a circuit breaker, etc. are provided in the housing. Electrical equipment parts are provided.

[0011] In the power converter according to the first aspect of the present invention, a ventilation path including a ventilation path and a duct for the cooling body is provided to penetrate the casing, and a DC reactor,
Because an AC reactor and a ventilation fan are provided,
The outside air sucked by the fan passes only through the two reactors and does not pass through the electrical equipment components other than the two reactors, preventing the electrical equipment components from being deteriorated by the outside air, and it is sufficient that at least one ventilation fan is provided. Further, it can be made inexpensive and small without using expensive filters and fans.

Next, in the power conversion apparatus according to the second aspect of the present invention, a power conversion unit is formed by mounting a semiconductor switch element, a drive control board, and a capacitor outside a cooling body having an air passage. A ventilation fan and a DC reactor are provided in the unit duct, and a circuit breaker for wiring is provided outside the DC unit duct to form a DC circuit unit,

An AC reactor is provided in the AC duct, and a circuit breaker and an electromagnetic contactor are provided outside the AC reactor to form an AC circuit unit. The ventilation path formed by the two ducts is provided to penetrate the housing.

According to a second aspect of the present invention, there is provided a power conversion unit comprising a cooling body, a semiconductor switch element, a drive control board, and a capacitor, a DC section duct, a ventilation fan, a DC reactor, and wiring. Circuit unit consisting of an AC circuit breaker and an AC circuit unit consisting of an AC section duct, an AC reactor, a circuit breaker, and an electromagnetic contactor. A ventilation path consisting of a road and both ducts,
Since it is provided penetrating through the housing, in addition to the effects of the above-mentioned claim 1, it is possible to perform the mounting and assembly of each electric device component for each unit without performing the assembly inside the housing. The weight can be reduced, and workability such as assembly, maintenance and inspection can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. Reference numeral 17 denotes a housing of the power conversion device, and reference numeral 18 denotes a cooling body as a cooling radiator mounted on an upper central portion of a rear plate 19 of the housing 17, and as shown in FIG. 20 and an air passage 21 is formed. Reference numeral 22 denotes a semiconductor switch element mounted on the front surface of the cooling body 18, and reference numeral 23 denotes a drive control board for the element 22, which is mounted on the front surface of the element 22.

Reference numeral 24 denotes a smoothing condenser supported by a support plate 25 mounted on the front surface of the substrate 23, and 26 denotes a smoothing condenser mounted on the lower part of the rear surface of the substrate 23.
8, the element 22, the substrate 23, the capacitors 24 and 26, etc., form a power conversion unit A.

Reference numeral 27 denotes a DC substrate, which comprises a U-shaped portion 28 and an upper plate 29 and a lower plate 30 from both ends of the U-shaped portion 28 as shown in FIG. The lower plate 30 is joined to the left side of the rear plate 19, and the DC portion duct 31 is formed by the U-shaped portion 28 and the rear plate 19, and the right side of the DC portion duct 31 communicates with the air passage 21 of the cooling body 18. The left side is joined to the filter 33 of the left side plate 32 of the housing 17.

Reference numeral 34 denotes a chopper DC reactor provided in the DC duct 31; 35, a ventilation fan provided on the left side of the DC duct 31; 36, a DC input wiring breaker mounted on the lower plate 30; Yes, DC part substrate 27, DC part duct 31, DC reactor 34, ventilation fan 35,
A DC circuit unit B is formed by the wiring circuit breaker 36 and the like.

Reference numeral 37 denotes an AC unit substrate, which has substantially the same shape as the DC unit substrate 27 and comprises a U-shaped portion 38, an upper plate 39, and a lower plate 40, as shown in FIG. And rear plate 19
And the AC section duct 41 is formed by the
1 has a left side communicating with the air passage 21 of the cooling body 18 and a right side joined to the filter 43 of the right side plate 42 of the housing 17.

Reference numeral 44 denotes an AC reactor for a filter provided in the AC duct 41, and reference numerals 45, 46, and 47 denote circuit breakers for AC output wiring, filters, and AC output electromagnetic contactors mounted on the lower plate 40. AC part substrate 37, AC part duct 41, AC reactor 44, circuit breaker 4 for wiring
5, an AC circuit unit C is formed by the electromagnetic contactor 46 and the like.

A ventilation section 48 composed of the ventilation path 21 of the cooling body 18, the DC section duct 31, and the AC section duct 41.
Are provided to penetrate the housing 17 in the left-right direction.

In the above embodiment, the ventilation path 48 including the ventilation path 21 of the cooling body 18 and the DC section duct 31 and the AC section duct 41 is provided to penetrate the housing 17.
8 is provided with a DC reactor 34, an AC reactor 44, and a ventilation fan 35, so that the outside air sucked by the fan 35 passes only through the reactors 31 and 41,
The heat of the two reactors 31 and 41 can be smoothly discharged, the outside air does not pass through the electric equipment parts other than the two reactors 31 and 41, the insulation deterioration of the electric equipment parts due to the outside air is prevented, and the ventilation fan is used. Need only be at least one, and at low cost without using expensive filters and fans.
And it can be miniaturized.

Further, the housing 17 has three units A,
B, C, that is, the power conversion unit A, the DC circuit unit B, and the AC circuit unit C, so that each unit A, B , C for each unit, the work is easy, the weight of each unit A, B, C can be reduced, and the workability such as assembly, maintenance and inspection can be improved.

Further, since the conventional drive board 12 and control board 14 are integrated into one drive control board 23 without being separated, wiring between the conventional boards 12 and 14 can be omitted. Yes, it can be cheaper.

[0025]

Since the present invention is configured as described above, it has the following effects. In the power converter according to the first aspect, a ventilation path 48 including the ventilation path 21 of the cooling body 18 and the ducts 31 and 41 is provided through the housing 17, and the DC reactor 34, the AC reactor 44, and the ventilation path 48 are provided in the ventilation path 48. Since the ventilation fan 35 is provided, the outside air sucked by the fan 35 passes only through the two reactors 34 and 44 and passes through the two reactors 34 and 4.
4 does not pass through the electrical equipment components other than the above, the electrical equipment components are prevented from being deteriorated by the outside air, and at least one ventilation fan is required. Further, it is inexpensive without using expensive filters and fans, and Can be small.

Next, a power converter according to a second aspect of the present invention includes a cooling unit, a semiconductor switch element, and a drive control board.
3, a power conversion unit A including a condenser 24, a DC section duct 31, a ventilation fan 35, and a DC reactor 3.
4, a DC circuit unit B including a circuit breaker 36;
AC circuit unit C of AC section duct 41, AC reactor 44, circuit breaker 45, and electromagnetic contactor 47
Units A, B,
C, the air passage 21 of the cooling body 18 and both ducts 31,
Since the ventilation path 48 composed of the through-holes 41 is provided so as to penetrate the housing 17, the units A and B can be installed without performing the mounting and assembly of each electric device component in the housing 17, in addition to the effects of the first embodiment. , C for each unit, the work is easy, the weight of each unit A, B, C can be reduced, and the workability such as assembly, maintenance and inspection can be improved.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a sectional side view of a conventional example.

[Explanation of symbols]

 Reference Signs List 17 housing 18 cooling body 21 air passage 22 semiconductor switch element 23 drive control board 24 capacitor 31 DC section duct 34 DC reactor 35 ventilation fan 36 wiring breaker 41 AC section duct 44 AC reactor 45 wiring breaker 47 electromagnetic contact Container 48 Ventilation path A Power conversion unit B DC circuit unit C AC circuit unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Norio Sakae Inventor No. 47 Umezu Takaune-cho, Ukyo-ku, Kyoto-shi F-term in Nissin Electric Co., Ltd. (reference) 5H007 AA06 BB07 CA00 CB00 CC00 HA03 HA05 HA07

Claims (2)

[Claims] 1. A ventilation path comprising a cooling body having a ventilation path and a duct is provided penetrating a housing, a ventilation fan, a DC reactor and an AC reactor are provided in the duct, and a semiconductor switch is provided on an outer surface of the cooling body. A power converter, comprising: an element mounted thereon; and a drive control board for the element, and electric device parts such as a capacitor and a circuit breaker provided in the housing. 2. A power conversion unit is formed by mounting a semiconductor switch element, a drive control board, and a capacitor outside a cooling body having an air passage, and a ventilation fan and a DC reactor are provided in a DC section duct. A DC circuit unit is formed by providing a circuit breaker outside the DC section duct, and an AC reactor is provided inside the AC section duct, and a circuit breaker and an electromagnetic contactor are provided outside the AC section reactor to form an AC circuit. A power converter, wherein a circuit unit is formed, and the respective units are joined to each other, and a ventilation path including the ventilation path and the two ducts is provided through the housing.