JPH03289332A - Onboard inverter unit for oa machine - Google Patents

Abstract

PURPOSE:To block noise produced in an automobile and to make it possible to use an inverter unit for OA machines by arranging batteries having predetermined capacity, to be connected in parallel, on the input side of a DC power supply for an inverter circuit. CONSTITUTION:Input side of an inverter circuit 40 is connected between the load side of a main switch 36 and the load side of one terminal 32B of a power supply input connector 32, and a battery pack 38 is connected in parallel with the inverter circuit 40 in proximate thereto. The battery pack 38 comprises a breaker 38C and a plurality of batteries 38D and has a predetermined electrical storage capacity. The plurality of batteries 38D serve as filters for blocking electrical noise produced in a generator 11A. According to such arrangement, noise produced in an automobile can be blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-vehicle inverter device for OA equipment, and can be used to supply power to OA equipment mounted on a car.

[Background technology]

2. Description of the Related Art Conventionally, there has been an inverter device that converts direct current to alternating current, and this inverter device is used as one of the devices constituting an uninterruptible power supply for a computer or the like. Such uninterruptible power supplies are also equipped with rectifiers, storage batteries, etc. During normal times, this storage battery is charged with electricity from the electric power company, etc., and during a power outage, the DC power stored in this storage battery is transferred to an inverter. converts into alternating current. This uninterruptible power supply system has made it possible to operate computers regardless of the presence or absence of power supply from the electric power company.

On the other hand, with the spread of OA equipment in recent years, there is a desire to use OA equipment not only indoors where electricity is supplied from electric power companies, but also outdoors where such electricity is not available, such as in cars. .

In response to this demand, it is conceivable to connect an inverter device to the DC electrical system of an automobile, etc., and convert the electric power obtained from the DC electrical system into alternating current with the inverter device to operate OA equipment and the like.

[Problem to be solved by the invention]

However, the reality is that there is almost no surplus power available directly from the car's storage battery system, except for the power required for the car's driving system.

For this reason, operate the OA equipment etc. as described above.
However, since the power supply capacity is small and the input impedance of the inverter is high, electrical noise from the car's generator passes through the inverter circuit and acts on the OA equipment, such as a CRT display device, causing There is a problem in that this noise has an adverse effect on OA equipment, such as disturbing the screen.

SUMMARY OF THE INVENTION An object of the present invention is to provide an in-vehicle in-vehicle computer that can block noise generated by a car and can be used for office automation equipment.

[Means to solve the problem]

The present invention was made by focusing on the fact that a storage battery of a predetermined capacity functions as a filter that blocks out noise. Specifically, an in-vehicle inverter device for OA equipment is configured by including storage batteries of a predetermined capacity connected in parallel to the DC power input side of an inverter circuit of the inverter device.

[Effect]

According to the present invention, when the generator of the automobile generates power, the inverter circuit converts the automobile's DC power into alternating current and supplies it to the OA equipment, and the storage battery stores the DC power from the automobile. At this time, since this storage battery functions as a capacitor, high frequency electrical noise is bypassed to the storage battery side. As a result, the noise generated by the automobile is not transmitted to the inverter circuit side, the noise is blocked, and the OA equipment operates normally.

On the other hand, when the car's generator is stopped, the inverter circuit converts the DC power stored in the storage battery into AC power and supplies it to the OA equipment.

In this way, regardless of the operating status of the car's generator, OA
Provides power to equipment.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a circuit diagram showing the schematic configuration of this embodiment, and
Each figure shows a front view of the apparatus of this embodiment.

In FIG. 1, an inverter device 30 of this embodiment is connected to the output side of a DC electrical system 10 of a vehicle. This DC electrical system 10 includes a power generation section 11 consisting of a generator 11A and a rectifying diode IIB, and a lead storage battery 12 as a main storage battery.

The inverter device 30 converts the DC power generated by the DC electrical system 10 into AC power, and the OA equipment 20 connected to the output side
supply AC power to the

Further, the inverter device 30 is connected to each electrode of the lead-acid battery 12 of the DC electrical system IO through a power input connector 32. One terminal 32 of the power input connector 32
A includes a fuse 33, an overcurrent protection resistor 34 at the time of short circuit,
A reverse connection protection diode 35 and a main switch 36 are connected in series.

The load side of the main switch 36 and the power input connector 32
The input side of an inverter circuit 40 that converts direct current to alternating current is connected between the load side of the other terminal 32B, and a storage battery pack 38 as an auxiliary storage battery is connected to the inverter circuit 40 in parallel with the inverter circuit 40. They are connected closely to each other so that the input wiring impedance is low.

The storage battery bag 38 includes a breaker 38C and a plurality of storage batteries 38'D, and has a predetermined electrical storage capacity. These plurality of storage batteries 38D serve as a filter that blocks electrical noise generated by the generator 11A.

The inverter circuit 40 includes a start push button switch 5.
1 is connected, and the primary winding 46A of the step-up transformer 46 is also connected. A secondary winding 46B of this step-up transformer 46 is connected to the OA equipment 20 via a power output connector 47.

FIG. 2 shows the appearance of the inverter device 30. In FIG. 2, a panel 31 provided on the front side of the inverter device 30 includes a fuse holder 33A1 housing the fuse 33 from above, a main switch 36, a start pushbutton switch 51, a power output connector 47, a power input connector 32, and An overcurrent protection breaker 38C is provided.

Next, the operation of this embodiment will be explained.

The inverter device 40 of this embodiment has two modes: an "auxiliary storage battery charging mode" in which the storage battery 38D, which is an auxiliary storage battery, is charged without using the OA equipment 20, and an "inverter operation mode" in which power is supplied to the OA equipment 20. Has standard operating modes.

In the "auxiliary storage battery charging mode", the main switch 36 of the inverter device 30 and the overcurrent protection breaker 3
Turn on 8C. As a result, the storage battery 3 is connected from the power input connector 32 via the fuse 33, the overcurrent protection resistor 34, the reverse connection protection diode 35, and the main switch 36.
8D is charged. At this time, the car's DC electrical system l
The generator 11A of O is activated and also charges the lead acid battery 12.

This auxiliary storage battery charging mode is performed when the car is running without using the OA equipment 20, and at this time the inverter circuit 40
is not working.

Next, in the "inverter operation mode", the power switch on the OA equipment 20 side is turned on while the main switch 36 and overcurrent protection breaker 38C of the inverter device 30 are kept on. In this state, push the start pushbutton switch 51 to the ON state.

As a result, DC power from the storage battery pack 38, which is an auxiliary storage battery, and DC power from the car's DC electrical system lO from the power supply input connector 32, fuse 33, overcurrent protection resistor 34, reverse connection protection diode 35, and main switch 36. are input to the inverter circuit 40 in parallel. Therefore,
The operation of the inverter circuit 40 supplies necessary AC power to the OA equipment 20 via the step-up transformer 40 and the output connector 47.

At this time, since the storage battery pack 38 is arranged near the inverter circuit 40 so that the input wiring impedance is low, the noise generated from the car's DC electrical system IO1, especially the generator llA, is absorbed by the storage battery pack which is the inverter input. 38, and the noise does not enter the load OA equipment 20.

Furthermore, in addition to the power from the DC electrical system 10 of the vehicle, power is supplied from the storage battery pack 38 built into the inverter device 30, so that the power necessary for the OA equipment 20 can be supplied without causing any trouble to the vehicle's running system. Supplied.

According to the above embodiment, the following effects can be achieved.

That is, the inverter device 30 includes the inverter circuit 4
Since the storage battery 38D is connected in parallel to the input side of 0,
This storage battery 38D acts as a noise filter and can block electrical noise generated by the car's generator 11A, etc., thereby preventing the OA equipment 20 from malfunctioning. Furthermore, there is no problem with the input power necessary for driving the vehicle.

Furthermore, the storage battery 38D can compensate for the lack of power storage capacity of the lead storage battery G12 for the OA equipment 20.

Since the output of the step-up transformer 46 or the inverter circuit 40 is boosted, the transformer 46 can also block noise generated by the generator 11A and the like. Therefore, double noise shielding can be achieved by the storage battery 38D and the step-up transformer 46, resulting in an extremely low-noise power source.

Note that the present invention is not limited to the above-described embodiments, but includes the following modifications.

That is, the inverter device 30 is not limited to the one provided with the step-up transformer 46, but may also be provided with a DC-DC converter for boosting the input voltage on the input side of the inverter circuit 40, and a smoothing circuit consisting of a capacitor or the like on the output side. It may also be something that was given to you. In this way, the heavy step-up transformer 46 can be omitted, and the weight of the inverter device 30 can be reduced.

Although the inverter device 30 is equipped with a storage battery pack 38 that includes a plurality of storage batteries 38D, the inverter device 30 may be configured with − storage batteries of a predetermined capacity, and the number and type of storage batteries are not limited. .

Further, the storage battery pack 38 may be separately provided to the inverter device 30 via a cable or the like so that it can be easily attached and detached. Furthermore, the storage battery pack 38 may be configured with a nickel cadmium battery and can be charged using a household power source. At this time, charging may be performed by switching between a household power source and an automobile power source such as a cigarette lighter.

What is connected to the terminals 32A and 32B is not limited to the DC electric system IO of the automobile, but may be any other DC power source or the like, such as a solar battery. If you connect a solar battery, you can create a generator 1
DC power can be obtained from solar radiation even when 1A is stopped, and solar energy can be used to operate the OA equipment 20 or to use the storage battery 38D.
Can be used for charging. At this time, even if the sun goes down while the OA equipment 20 is in operation, a constant voltage can be maintained by the storage battery pack 38, so an additional effect can be added that unstable solar energy can be effectively utilized.

FIG. 1 is a circuit diagram of one embodiment of the present invention, and FIG.
FIG. 3 is an external view of the embodiment shown in the figure.

10... Automobile DC electrical system, 20... OA equipment,
30... Inverter device, 38... Storage battery pack,
38D...Storage battery, 40...Inverter circuit.

Claims (1)

[Claims] (1) An in-vehicle inverter device for OA equipment that supplies power to OA equipment mounted on a car, characterized by being equipped with a storage battery of a predetermined capacity that is connected in parallel to the DC power input side of the inverter circuit of the inverter device. In-vehicle inverter device for OA equipment.