JPH01254445A - Electric power source device - Google Patents

Abstract

PURPOSE:To obtain a simple electric power source device for the equipment mounted onto a vehicle by applying the voltage equal to the voltage which is obtained by smoothing-rectifying the commercial electric power by connecting a DC/DC converter with a dc power source and connecting the dc and ac power sources to the rectifying and output circuits through a same input terminal. CONSTITUTION:A DC/DC converter 22 is connected with a dc power source of a battery 21 mounted on a vehicle, and the voltage (140V) which is obtained by smoothing-rectifying the commercial electric power source in AC 100V can be applied, permitting the connection with the input terminals 24a and 24b. The commercial electric power source can be connected with input terminals 26a and 26b. Each input terminal can be selected by the switch pieces 28a and 28b, and the commercial power source is smoothing-rectified to 140V by a rectifying circuit 16, and the dc power source in 140V is inputted, and a prescribed electric power source is obtained by a switching circuit 18 and a transformer 16. ln order to use a facsimile, etc., with a dc power source in a vehicle, the constitution of the electric power source in the facsimile can be made simple.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply device, and particularly to a power supply device that is simple in structure and has excellent versatility.

BACKGROUND OF THE INVENTION In recent years, with the spread of car phones, it has become possible to use the functions of car phones to load data communication equipment such as facsimiles into cars and send and receive image information and other data. There is.

A general example of such a vehicle-mounted data transmission/reception system is shown in FIG. This data transmission and reception system
A facsimile device 3 is placed on a sheet 2, and image information is transmitted and received by operating a car battery 4 as a power source.

The connection between the battery 4 and the facsimile device 3 is
This is done via a key switch 5 installed near the driver's seat of the vehicle 1 and a DC/DC converter 6 placed at a predetermined position inside the vehicle 1. A connector member 7 is provided.

As a power supply device used in such a data transmission/reception system (hereinafter typified by a facsimile machine), there is a power supply device as shown in FIG. 10, for example. That is,
A battery 4 provided outside the facsimile device 3;
A DC/DC converter 6 connected to this battery 4 and a facsimile +
) An AC/DC power supply 9 provided in the device 3 and connected to the AC power supply connection terminal 8, and a DC power supply connection terminal provided separately from the AC/DC power supply 9 and the AC power supply connection terminal 8. ] A second DC/DC converter 1 connected to
1 and the input to this DC/DC converter 11 is
/ A switch mechanism 12 for switching between the DC power source 9 and the DC power source is provided. And facsimile +) device 3
When connected to the AC power supply 13, the switch mechanism 12 is activated to convert the DC/DC converter to the AC/D converter.
The facsimile device 3 is connected to the C power source 9 side, and the facsimile device 3 is operated by the power taken in from the AC power source 13. On the other hand, when the facsimile device 3 is connected to the battery 4, the switch mechanism 12 is operated to configure the power supply circuit of the battery 4, the DC/DC converter 6, and the second DC/DC converter 11. The facsimile machine 3 is operated by electric power.

Problems to be Solved by the Invention However, in such conventional power supply devices,
In order to operate the facsimile device 3 using either an AC power source or a DC power source, an AC/DC power source 9 and a second DC/DC converter 11 are provided in the facsimile device 3.
In addition, there are problems in that the cost increases because a switch mechanism 12 and a switch mechanism 12 must be incorporated, and the device becomes complicated due to the configuration for switching circuits.

The present invention has been made in view of these conventional problems, and its purpose is to provide a power supply device that has a simple and inexpensive configuration and that can be used by connecting data communication equipment to a commercial power source and a battery power source. The goal is to provide the following.

Means for Solving the Problems In order to achieve the above object, the present invention provides a DC/DC converter that outputs a voltage equivalent to a voltage obtained by rectifying and smoothing a commercial power source, and a terminal that can be connected to either a DC or an AC power source. ,
The gist of the present invention is a power supply device that includes means for rectifying terminal input, and means for transforming the output from the rectifying means into a device operating voltage and outputting the voltage.

The working terminal input is rectified by a rectifier circuit. The rectified voltage is intermittent at a high frequency and applied to the primary side of the transformer, and the output on the secondary side is smoothed to obtain an output.

Since the terminal input is equal to the commercial power supply and the battery input, the input from either power source can be applied to the primary side of the transformer after rectification, making it possible to use both AC and DC sources. becomes.

Embodiment FIGS. 1 and 2 are diagrams showing an embodiment of a portion of a power supply device according to the present invention on the side of a facsimile machine 3 as an operating device.

The facsimile side portion of the power supply device according to this embodiment includes a rectifier circuit 15 that rectifies power input from input terminals 14a and 14b, a transformer 16 to which a primary coil is connected to the output side of the rectifier circuit 15, and a rectifier circuit 16 that rectifies power input from input terminals 14a and 14b. A capacitor circuit 17 connected in parallel between the circuit 15 and the primary coil of the transformer 16
, a switching circuit 18 connected in series between the rectifier circuit 15 and the primary coil of the transformer 16, and a switching control circuit 19 that controls the operation of the switching circuit.
It consists of an output circuit connected to the secondary coil of the transformer 15. The rectifier circuit 15 has four diodes arranged according to a predetermined rule, and current is conducted in the same direction in the primary coil of the transformer 16 regardless of whether the input terminal 14a or 14b is the positive (or negative) terminal. It is supposed to be done.

The capacitor circuit 17 has a function of smoothing the output of the rectifier circuit 15 when the input terminals 14a and 14b are connected to an AC power source. Furthermore, a transistor is used as the switching circuit 18.

In contrast to such a facsimile side partial power supply device, the facsimile external partial power supply device includes a battery 21 as a DC power source, a DC/DC converter n connected to the battery 21, and It consists of a 100 volt AC power source used indoors. D C/D
The C converter n is set to have a bare output whose output voltage is equal to the voltage obtained by rectifying and smoothing the commercial power supply, and a DC power supply output terminal 24a124b is provided on the output side of the DC/DC converter n. A plug 5 is still provided for connecting the facsimile machine to an alternating current power supply,
An AC power output terminal 26as26b is provided at its base end. And terminals 24a, 24b and terminal 26a12
A switch piece 28aX28b is provided to switch the connection of the terminals 14a and 14b between the terminals 6b and 6b.

In the configuration of the facsimile side portion of the power supply device, output terminals 27aX27b are provided on the output side of the output circuit for supplying power to each operating portion of the facsimile device.

27c and 27d are provided.

In a power supply device having such a configuration, operations associated with use of a facsimile device will be described.

First, when the facsimile machine is used indoors such as in an office, when the plug 5 is connected to a 100 volt AC power source, the switch pieces 28a-, 28b are connected to the AC power output terminals 26a, 26b, as shown in FIG. come into contact with. As a result, power from the commercial power source is transferred to the input terminal 14a.
, 14b into the facsimile machine, passes through the rectifier circuit 15 to a voltage of around 140 volts, and is input to the switching circuit 18.

In the switching circuit 18, the switching control circuit 19
A switching operation is performed under the control of the output terminals 27as, 27bs, 27cXZ7d, and each output is sent out from the output terminals 27as, 27bs, 27cXZ7d.

Next, when the facsimile device is used outdoors, when the facsimile device is connected to the basoli 21 by the connector 7 connection as shown in FIG. 3, the switch pieces 28a,
28b are in contact with the DC power output terminals 24a and 124b, respectively, to form a circuit. As a result, power from the battery 21 is transferred to the input terminal 1 via the DC/DC converter n.
4a and 14b. The voltage of the battery 21 is D
A voltage of around 140 volts is generated by the C/DC converter η, and is input to the switching circuit 18 via the rectifier circuit 15. In the switching circuit 18, a switching operation is performed under the control of the switching control circuit 19, and each output is sent out from the output terminals 27a, 27bX27cX27d.

In this way, regardless of whether the facsimile device is connected to the DC power supply 21 or the AC power supply B, the same input terminal 14a,
Power is introduced into the facsimile machine from 14b,
Further, the same rectifier circuit 15 performs rectification operation and switching operation.

As described in detail, according to the present invention, a DC/DC converter that outputs a voltage equivalent to a voltage obtained by rectifying and smoothing a commercial power supply is connected to a DC power supply, so that AC power and DC power are the same. Since it is introduced into the same rectifier circuit through the input terminal of the power supply circuit and used as the power supply circuit output, it is possible to input both direct current and alternating current to the same power supply circuit. This simplifies the configuration of the power supply device, resulting in miniaturization and cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the configuration of the facsimile device side portion of the power supply device according to the present invention, and FIG. 2 is a block diagram showing the overall configuration of the power supply device according to the embodiment.
FIG. 3 is a diagram showing an example of a case where a facsimile machine is used outdoors using a DC power supply, and FIG. 4 is a block diagram showing an example of a conventional power supply device. 14a, 14b...input terminal, 15...rectifier circuit,
16... Transformer, 18... Switching circuit, 19
...Switching control circuit, addition...output circuit, 21
...Battery (DC power supply L22...DC/DC converter, n...AC power supply. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st)
Figure q Figure 2 Figure 4

Claims (1)

[Claims] A DC/DC converter that is connected to a DC power source and applies a voltage equivalent to a voltage obtained by rectifying and smoothing a commercial power source, an input terminal that can be connected to a DC power source and an AC power source, and means for rectifying the current introduced into the input terminal. and means for converting the output of the rectifier circuit into a voltage for operating an actuator and outputting the voltage.