JPH0743942Y2 - Power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A Field of Industrial Application The present invention relates to a power supply device, and is suitable for application to, for example, a portable still image transmission device adapted to transmit a still image via a telephone line. is there.

B Outline of the Invention In the power supply device according to the present invention, a plurality of batteries that are detachably held are connected in parallel through parallel circuits of a diode and a switching switch, respectively.
The battery can be replaced without interrupting the power supply.

C Conventional Technology Conventionally, in this type of still image transmission device, it is arranged to be installed at a construction site, a store or the like in a remote place and used for monitoring or the like.

That is, in the still image transmission device, for example, the image data sequentially output from the imaging device is stored in the image memory circuit at a predetermined timing to store the still image in the image memory circuit, and then the image data of the still image is stored. Are sequentially read, data is compressed, and the data is transmitted using a dedicated line.

D Problems to be Solved by the Invention By the way, while the conventional still image transmission device is large and is an installed type that uses a dedicated line, if a portable still image transmission device that uses a telephone line can be obtained. , Considered practical and convenient.

That is, according to the portable still image transmission device that uses a telephone line, a still image can be transmitted even from a destination.
For example, it is possible to directly transmit a still image immediately after the interview from the interview site by using a telephone line near by.

Furthermore, even in a construction site that moves according to the progress of construction such as railway construction, the construction site can be monitored in real time by connecting to a portable telephone or the like.

Further, since it can be easily installed with only a telephone line, it is considered that the still image transmission device can be applied to various fields.

To this end, it is necessary to reduce the size of the still image transmission device and reduce the overall power consumption so that it can be driven even in batteries.

Further, in order to be applicable to various fields, it is necessary to reduce the size of the battery itself and improve portability.

However, in such a still image transmission device that is actually carried and used as described above, one of the methods of use is to continuously transmit a number of still images. In such a case, still images are transmitted. There is a risk that the battery will be consumed during the operation.

In this case, it becomes difficult to transmit valuable still images,
The characteristics of the portable still image transmission device are not utilized.

One way to solve this problem is, for example, Shoukaisho 58.
A method of holding the battery in a replaceable manner is conceivable by using the method disclosed in Japanese Patent Publication No. 130361.

However, even if the battery is exchanged using this method, there is a problem that the power supply is temporarily interrupted during the battery exchange, and it becomes difficult to transmit a still image during that time.

Especially, for example, when the line condition changes momentarily and the time required for the transmission of still images changes, the transmission interruption itself must be avoided as much as possible. In this case, the transmission of temporary still images is interrupted. The method of exchanging batteries is not practical.

As a method for solving this problem, a method of increasing the capacity of the battery can be considered, but the portability of the still image transmission device is impaired by that amount, which is not practical.

The present invention has been made in consideration of the above points, and an object thereof is to propose a power supply device capable of replacing batteries without interruption of power supply.

E Means for Solving the Problems In order to solve the above problems, in the present invention, in the power supply device 60 configured to detachably hold the plurality of batteries 41, 42, the plurality of batteries 40, 41 are provided. The power output from is connected in parallel via a parallel connection circuit of diodes 48 and 49 and switching switches 61 and 62, and is output to a predetermined electronic device 50.

F action By connecting a plurality of batteries 40, 41 held in a detachable manner in parallel through the parallel connection circuit of the diodes 48, 49 and the switching switches 61, 62, the battery 40, 40 can be supplied without interruption of power supply. 41 can be exchanged.

G Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(G1) Basic Configuration In FIG. 1, reference numeral 10 denotes a portable still image transmission device which is driven by a battery as a whole, and selects a predetermined video signal to capture a still image, It is designed to be transmitted.

That is, in the still image transmission device 10, the input terminal 12, 13 and 14 arranged on the side surface, the video of the component composed of a composite video signal in which the chroma signal is superimposed on the luminance signal, the luminance signal and the color difference signal respectively. A signal and a color signal are received, so that a still image is taken in from three types of video signals.

Further, output terminals 25, 26, and 27 are provided on the side surface of the still image transmission apparatus 10, and the video signals input from the input terminals 12, 13 and 14 are directly output from the output terminals 25, 26 and 27 and are also captured. The still image or the still image transmitted from the transmission target is converted into a video signal and output from the output terminals 25, 26 and 27.

Further, on the front surface of the still image transmission device 10, operating elements 30A to 30E and a numeric keypad 32 are arranged together with a power switch 29, and the operation mode is switched according to the operation of the operating elements 30A to 30E and the numeric keypad 32 to perform a desired transmission. The still image is transmitted to the target and the still image is received from the transmission target.

Further, the liquid crystal display 33 is arranged above the operators 30A to 30E to display the functions of the operators 30A to 30E which are switched according to the operation mode, and to display an error message or the like. The operators 30A to 30E are effectively used to improve the usability of the still image transmission device 10.

Two nickel cadmium batteries 40 and 41 are detachably held on the back surface of the still image transmission device 10, so that the batteries 40 or 41 can be exchanged while transmitting still images as needed. It is done like this.

That is, as shown in FIG. 2, when the batteries 40 and 41 are guided to a guide (not shown) provided on the rear surface of the still image transmission apparatus 10 and fixed at a predetermined holding position, the still images 40 and 41 are fixed. The positive and negative electrodes provided on the surface facing the transmission device 10 have terminals 43 and 4 protruding from the still image transmission device 10.
It is designed to touch 4, 45, 46.

Thereby, the batteries 40 and 41 can be attached and detached by a simple operation, and the batteries 40 and 41 can be exchanged even when the still image transmission device 10 is used, for example.

Further, in the still image transmission device 10, the batteries 40 and 41 are connected in parallel via the diodes 48 and 49, respectively, and when the power switch 29 is turned on,
The power of the batteries 40 and 41 is supplied to the built-in DC-DC converter circuit 50, so that the DC-DC converter circuit 50 supplies the power supply voltage held at a predetermined voltage.

Furthermore, in the still image transmission device 10, the voltage on the cathode side of the diodes 48 and 49 is monitored using the voltage detection circuit 52, and when the voltage decreases below a predetermined value,
A warning message is displayed on the liquid crystal display unit 33.

Here, the nickel cadmium batteries 40 and 41 detect the consumption of the batteries 40 and 41 by monitoring the voltage on the cathode side of the diodes 48 and 49 because the terminal voltage of the batteries 40 and 41 drops when the power supply is consumed. You can

Therefore, the operator can confirm the consumption of the batteries 40 and 41 through the display of the liquid crystal display unit 33.

At this time, in the still image transmission device 10, the battery 40
Since 41 and 41 are connected in parallel via diodes 48 and 49, respectively, when only one battery 40 or 41 is mounted to drive the still image transmission apparatus 10, after the battery 41 or 40 is mounted. The batteries 40 and 41 can be exchanged without interrupting the supply of power by removing the batteries 40 or 41 that have been installed until then.

Therefore, the battery 40 can be used without interrupting the transmission of still images.
And 41 can be exchanged, and the usability of the still image transmission device 10 can be further improved.

Further, at this time, the batteries are connected via the diodes 48 and 49.
Since 40 and 41 are connected in parallel, when a fully charged battery 41 or 40 is installed, the battery 41 or 40
It is possible to effectively avoid the backflow of the power source to the battery 40 or 41 which has been used until then.

Therefore, the batteries 40 and 41 are connected to the diodes 48 and
If it is connected in parallel via
It is also possible to drive by mounting two of them, and in this case, the operation time can be extended as compared with the case of driving with only one.

According to the above configuration, the two batteries 40 and 41 are detachably held and are connected in parallel via the diodes 48 and 49, so that the batteries 40 and 41 can be connected without interruption of power supply. Can be exchanged, which effectively avoids the interruption of the still image transmission due to the consumption of the batteries 40 and 41.

(G2) Configuration of Embodiment In FIG. 3 in which parts corresponding to those in FIG. 2 are denoted by the same reference numerals, 60 indicates the power supply device according to the embodiment as a whole, and the switching switches 61 and 62 allow the battery 40 or The power supplied from 41 is switched.

The switching switches 61 and 62 are configured so that their contacts are complementarily switched, and are connected in parallel with the diodes 48 and 49, respectively.

Therefore, by mounting the batteries 40 and 41, the switching switch 61 and
If 62 is set to the ON state and the OFF state, respectively, the still image transmission device 10 can be driven by the battery 40, whereas if the switching switches 61 and 62 are set to the OFF state and the ON state, the battery 41 is driven. be able to.

Further, for example, when the battery 40 is consumed while the still image transmission device 10 is being driven by the battery 40, the voltage of the battery 40 drops, and the cathode side voltage of the diode 49 drops.

Therefore, when the voltage drop becomes larger than a predetermined voltage, the diode 49 is switched to the ON state, and power is supplied from the battery 41 instead of the battery 40.

Thus, when the battery 40 or 41 is consumed, the battery 40 and 41 can be automatically switched, and the usability of the still image transmission apparatus 10 can be improved.

Further, in this embodiment, the voltage on the cathode side of the diodes 48 and 49 and the voltage on the anode side of the diodes 48 and 49 are detected by the voltage detection circuit 63, whereby the potential difference between the terminals of the diode 48 or 49 is detected. When the voltage exceeds a predetermined voltage, a warning message is displayed on the liquid crystal display unit 33.

Incidentally, in this embodiment, the potential difference between the terminals is a diode.
When the voltages at which 48 and 49 are switched to the ON state are selected, and when the batteries 40 and 41 are switched by this, a warning message is displayed on the liquid crystal display unit 33.

Therefore, when a warning is issued, the operator interrupts the power supply by switching the switching circuits 61 and 62, removing the battery that has been used until then, and replacing it with a fully charged battery. The batteries 40 and 41 can be replaced without doing so.

Further, in the power supply device 60 of the embodiment, the switching switches 61 and 62 are provided, and the voltage of the batteries 40 and 41 is supplied via the switching switches 61 and 62. Since the voltage drop due to the diodes 48 and 49 can be avoided as compared with the case where the voltage is supplied, the batteries 40 and 41 can be effectively used.

Incidentally, in place of the diodes 48, 49 and the switching switches 61, 62, for example, a method of switching the batteries 40 and 41 by using a switching switch of make-before-break contact, a relay, etc. is conceivable. When it is applied to the portable still image transmission device 10 which becomes complicated, reliability may not be ensured.

Thus, according to this embodiment, the interruption of the still image transmission can be effectively avoided, and the usability of the still image transmission device 10 can be further improved.

According to the above configuration, the two detachably held batteries 40 and 41 are connected in parallel through the parallel connection circuit of the diodes 48 and 49 and the switching switches 61 and 62 whose contacts are complementarily switched. As a result, the batteries 40 and 41 can be exchanged without interrupting the power supply, and the interruption of the still image transmission due to the consumption of the batteries 40 and 41 can be effectively avoided.

Further, since the switching switches 61 and 62 are provided, the voltage of the batteries 40 and 41 can be applied to the electronic device without dropping.

(G3) Other Embodiments In the embodiment described above, two batteries 40 and 41 are used.
However, the present invention is not limited to two, but a plurality of batteries may be detachably held and connected in parallel as necessary.

Furthermore, in the above-described embodiment, the case where the consumption of the batteries 40 and 41 is detected by detecting the voltage between the terminals of the diodes 48 and 49 is described, but the method of detecting the consumption of batteries is not limited to this, and for example, the diode The forward currents of 48 and 49 may be detected.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the portable still image transmission device driven by battery is described, but the present invention is not limited to this, and the stationary still image transmission device is driven by battery. It can be widely applied to the case.

Further, in the above-described embodiments, the case where the present invention is applied to the still image transmission device has been described, but the present invention is not limited to this and can be widely applied to power supply devices of various electronic devices.

H Effect of the Invention As described above, according to the present invention, the plurality of batteries are detachably held and are connected in parallel through the parallel connection circuit of the diode and the switching switch, thereby interrupting the power supply. Batteries can be exchanged without.

[Brief description of drawings]

FIG. 1 is a perspective view showing a still image transmission device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a power supply circuit thereof, and FIG.
The drawing is a block diagram showing the second embodiment. 10 …… Still image transmission device, 29 …… Power switch, 40, 41…
… Batteries, 48,49… Diodes, 61,62… Switching switches.

Claims (1)

[Scope of utility model registration request] 1. A power supply device configured to hold a plurality of batteries in a detachable manner, wherein power supplies output from the plurality of batteries are connected in parallel via a parallel connection circuit of a diode and a switching switch,
A power supply device characterized by outputting to a predetermined electronic device.