JPH0478765A - Controller of ventilating fan for vehicle - Google Patents

Abstract

PURPOSE:To reduce the size and weight of a controller and improve its economy and reliability by arranging a dc - ac converting circuit in a box which stores a ventilating fan so that beat radiation by heat radiation fins for semiconductor cooling may be promoted utilizing air flow generated by the ventilating fan. CONSTITUTION:A dc - ac converting circuit 11 is housed with a ventilating fan 6 in a box 3, and heat radiation by heat radiation fins 5 for semiconductor cooling is promoted by utilizing air flow generated by the ventilating fan 6. Therefore, there is no need of installing an air blower for cooling separately or mounting large-sized heat radiation fins, or increasing the capacity of a semiconductor for electric power to restrain heat generation loss. It is thus possible to reduce the size and weight of the controller 4 and improve its economy reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a device for controlling a ventilation fan in a passenger compartment of a vehicle such as a railway vehicle.

[Prior Art] FIG. 4(a) is a longitudinal cross-sectional view of a railway vehicle equipped with a conventional vehicle ventilation fan control device, and FIG. 4(b) is a cross-sectional view of the same railway vehicle. , 1 is a car body of a railway vehicle, 2 is a cooling device, and 3 is a ventilation fan 6 installed on the top of the car body 1.
4A is a control device for a ventilation fan 6 installed under the floor of the vehicle body 1.

7 is an external decorative cover of the ventilation fan box body 3.

In addition, both FIGS. 5 and 6 show a control device 4 for a vehicle ventilation fan.
6 is a circuit diagram showing the configuration of A, in which either the device shown in FIG. 5 or FIG. 6 is used.

In FIG. 5, 8 is a battery device (DC power supply), 9 is a start switch, 10 is a DC-DC step-up conversion circuit, 11 is a DC-AC conversion circuit, and in FIG. 6, 12 is a DC-AC conversion circuit. , 13 is a boosting conversion circuit.

Next, the operation will be explained. In a vehicle, an evaporator blower (not shown) of the cooling bag M2 is normally operated by a separately installed AC power supply (not shown).
Ventilation is carried out by means of introducing fresh outside air, but due to an accident in which a train overhead wire is cut, a malfunction of the AC power supply device, the effect of the voltage on the train overhead wire, etc., the power supply to the cooling device 2 becomes unpowered, making ventilation impossible. It may happen. To deal with such a case, conventionally, a separate ventilation fan 6 is operated by the on-board battery device 8 via the control device 4A to ensure the amount of ventilation necessary for the passengers.

Note that the conventional control device 4A is shown in FIG. 4(a).

As shown in (b), it is suspended and mounted under the floor of the vehicle body 1.

[Problems to be Solved by the Invention] Since the conventional control device for a vehicle ventilation fan is configured as described above, the power semiconductor of the DC-AC converter 11 or 12 constituting the control device 4A is not activated during operation. In order to suppress the generated heat to below a specified temperature, a separate cooling fan (not shown) is provided, or large radiating fins are provided for cooling by natural heat radiation, and The capacity of power semiconductors has been increased to suppress generated heat loss. For this reason, there were problems such as the device becoming extremely large and the manufacturing cost increasing.

This invention was made in order to solve the above-mentioned problems, and by configuring the device integrally with a ventilation fan, it is possible to reduce the size and weight of the device, and to create a control device for a vehicle ventilation fan that is highly economical. The purpose is to obtain.

[Means for Solving the Problems] A control device for a vehicle ventilation fan according to the present invention disposes a DC-AC conversion circuit inside a box housing the ventilation fan, and generates a direct current in the airflow generated by the operation of the ventilation fan. - The heat dissipation fin for cooling the semiconductor of the AC conversion circuit is exposed.

[Function] In the vehicle ventilation fan control device according to the present invention, the direct current
The AC conversion circuit is housed inside a ventilation fan storage box, and the airflow created by the ventilation fan is used to promote heat radiation by the semiconductor cooling heat radiation fins.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In Figures 1 to 3, 1 is the body of a railway vehicle, 2 is an air conditioner, 3 is a box provided on the top of the car body 1 and houses a ventilation fan 6, and 4 is a ventilation fan that is housed inside this box 3 together with the ventilation fan 6. 6, this control bag M4 is configured similarly to that shown in FIG. 5 or 6, and has a DC-AC conversion circuit 11 or 12 using a power semiconductor.
By.

The direct current from the battery device (DC power supply) 8 is converted into alternating current to drive and control the ventilation fan 6.

Further, numeral 5 designates a heat dissipation fin for semiconductor cooling of the DC-AC conversion circuit 4, which is provided so as to be exposed in the airflow generated by the operation of the ventilation fan 6, and 7 designates an external decorative cover of the ventilation fan box body 3.

Next, the operation of the apparatus of this embodiment will be explained.

The operation of the ventilation fan 6 is the same as that of the conventional device described above. For example, in the control device 4 configured as shown in FIG. 5, the AC power supply device (not shown) for the cooling bag N2 is used.
At the time of failure or power outage, the start switch 9 is closed and the battery device M8 is connected to the input terminal of the DC-DC boost conversion circuit 10.
battery voltage is applied. This battery voltage varies depending on the type of vehicle, but usually DC24V, DC37V
Either ゜5V or DClooV is used. On the other hand, the ventilation fan 6 serving as a load is AClooV or AC
A 200V single-phase motor or a three-phase induction motor is used. FIG. 5 shows an example using a three-phase induction motor.

For example, the ventilation fan 6 used is AC200V.

If it is 3 phase and the battery used is DClooV,
Considering voltage fluctuations during charging and discharging of the battery device 8, 70
~110% variation range, the DC output voltage is
A DC-DC step-up conversion circuit 10 having an automatic voltage adjustment function so as to maintain a constant voltage of 300V is used. Next, D.C.
The 300V power supply is connected to the 6-phase PW of the DC-AC conversion circuit 11.
The M inverter function converts the power into a three-phase, AC200V power supply, and supplies the power to the ventilation fan 6.

At this time, since semiconductors such as power transistors are used in the DC-DC boost conversion circuit 10 and the DC-AC conversion circuit 11, the elements generate heat during operation. Cooling is performed by dissipating the heat generated by the element by heat conduction using the heat dissipating fins 5, thereby suppressing the element temperature to a specified value or less.

Particularly, in this embodiment, the DC-AC conversion circuit 11 is housed in a box 3 together with a ventilation fan 6, and the semiconductor cooling heat dissipation fins 5 are
Since heat dissipation is promoted, there is no need to install a separate cooling fan, large heat dissipation fins, or increase the capacity of power semiconductors to suppress generated heat loss.
The device can be made smaller and lighter, and its economical efficiency and reliability can be improved.

Note that the heat generated before the ventilation fan 6 starts operating does not pose a particular problem because the time required for the ventilation fan 6 to generate airflow is short.

Further, in the above embodiment, a case has been described in which the heat dissipation fins 5 are arranged on the airflow discharge side of the ventilation fan 6, but the heat dissipation fins 5 may be disposed on the intake side of the ventilation B6, and in this case, it is the same as in the above embodiment. The effects of this can be obtained.

[Effects of the Invention] As described above, according to the present invention, the DC-AC conversion circuit is housed inside the ventilation fan storage box, and the airflow generated by the ventilation fan is used to radiate heat by the heat radiation fins for cooling semiconductors. Since the structure is configured to promote this, the device can be made smaller and lighter, as well as being inexpensive and highly reliable.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a control device for a vehicle ventilation fan according to an embodiment of the present invention, FIG. 2 is a perspective view showing the device of the above embodiment, and FIGS. 3(a) and (b) are A longitudinal cross-sectional view and a cross-sectional view of a railway vehicle equipped with the device of the above embodiment, respectively;
Figures 4(a) and (b) are longitudinal and cross-sectional views, respectively, of a railway vehicle equipped with a conventional vehicle ventilation fan control device, and Figures 5 and 6 are configurations of the vehicle ventilation fan control device. FIG. In the figure, 3-ventilation fan box, 4-control device, 5-semiconductor cooling heat dissipation fins, 6-ventilation fan, 8 battery device, 1
．． 1.12-DC-AC conversion circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 1

Claims (1)

[Claims] With a DC-AC conversion circuit using power semiconductors,
In a control device for a ventilation fan for a vehicle that converts DC power into AC to drive and control the ventilation fan, the DC-AC conversion circuit is arranged inside a box housing the ventilation fan, and the airflow generated by the operation of the ventilation fan. Inside, said DC-
A control device for a ventilation fan for a vehicle, characterized in that a radiation fin for semiconductor cooling of an AC conversion circuit is provided to be exposed.