JPH0348844Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rechargeable power supply device using a storage battery.

[Conventional technology]

Many portable electronic devices use batteries as their power source. For example, standard dry batteries such as JIS standards are generally used as a power source for portable stereo cassette recorders, portable video tape recorders, and small cameras, etc., and the range of their applications has been expanding with recent computerization.

[Problem that the invention attempts to solve]

Among electronic devices that use standard dry cell batteries as a power source, the difference between the output voltage of the dry cell battery and the voltage required for the electronic device to operate normally is small, and the battery is near the limit of its capacity. Some of them operate these electronic devices. for example,
Some portable stereo cassette recorders contain AA
Some devices are operated by a single dry cell battery, and these single AA battery power sources have a nominal voltage of 1.5V, which is dependent on the threshold voltage and operation of elements such as transistors in the internal amplifier circuit. Considering the voltage,
There is little voltage margin with respect to the nominal voltage, and when used continuously, problems such as deterioration of sound quality occur in a shorter time than ordinary electronic devices. In other words, when a dry cell battery is used continuously, a voltage drop occurs due to discharge of the dry cell battery, and the output voltage of the dry cell battery drops below the voltage required for these electronic devices in a short period of time, resulting in a deterioration of the SN ratio. The torque of the tape drive motor may decrease, resulting in abnormal playback sound. Therefore, when using these electronic devices, especially if you want normal operation without noise, the output voltage that decreases with use is necessary for normal operation of these electronic devices. The battery must be replaced when the specified voltage has been reached, which consumes many dry batteries, which is not economical.

On the other hand, ordinary devices, not electronic devices such as the portable stereo cassette recorder mentioned above, have a nominal voltage of 1.2V, are in the form of standard dry batteries, and can be used multiple times by charging. By using nickel-cadmium storage batteries, you can save on battery costs by not consuming multiple dry batteries. However, in electronic equipment such as the portable stereo cassette recorder mentioned above, the output voltage of the nickel-cadmium storage battery is
At 1.2V, there may be insufficient voltage compared to the voltage required for electronic equipment to operate properly.
It has not been possible to apply it to these electronic devices.

In view of the above points, it is an object of the present invention to provide a rechargeable power supply device that can be used in electronic devices that use dry batteries as a power source, and that can operate normally for a longer period of time than ordinary dry batteries.

[Means for solving problems]

In order to solve the above-mentioned problems, the rechargeable power supply device of the present invention houses a plurality of storage batteries connected in series in a casing having the external dimensions and shape of a standard dry cell battery. First and second current paths, which are switched and used, are formed between one terminal of the storage battery and the electrode of the casing. Here, the first current path is a current path mainly used for discharging, and a diode for adjusting the discharge voltage is housed and disposed within the housing. A switch, a rectifying element, or the like for switching and using is provided in the second current path.

[Effect]

By housing the power supply device in a casing that has the external dimensions and shape of a standard dry battery, it can be used in equipment that uses dry batteries as a power source. By connecting a plurality of storage batteries in series and providing a diode in the first current path between the terminals of the storage batteries and the electrodes of the casing, a voltage equivalent to the terminal voltage of the dry battery can be obtained during discharge. Here, the diode functions as a voltage drop element, and by using this diode, a constant voltage drop can be obtained, especially with respect to changes in current value. That is, unlike a resistor, the voltage that drops does not fluctuate depending on the current, but the voltage can be dropped stably. In contrast to the first current path that has a diode that provides a stable voltage drop during discharge, the second current path uses the voltage of the storage battery connected in series during charging or as it is to the voltage of the electrode of the casing. Used when a discharge occurs.

〔Example〕

A preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of a rechargeable power supply device according to a first embodiment of the present invention. This rechargeable power supply device includes two nickel cadmium storage batteries 4 and 5 electrically connected in series as voltage generation sources,
The above-mentioned parts of the rechargeable power supply device are housed in a casing 1 which has a diode 9 for adjusting the discharge voltage and a changeover switch 8, and has substantially the same external dimensions and shape as a standard dry battery.

FIG. 2 shows the external shape of this rechargeable power supply device. Figure 2 shows the external shape of a standard size AA dry battery. In this case, like a normal AA battery, the casing 1 of the rechargeable power supply is cylindrical. It has the shape of , and has electrodes 2 and 3 on the top surface and the bottom surface of the cylinder, respectively. In addition, it has a switch such as a changeover switch 8, which has approximately the same external dimensions as a standard dry cell battery.
Notch 1 to prevent the shape from protruding
4 is provided on the side of the cylinder.

Furthermore, to explain the structure of the rechargeable power supply device in detail, the housing 1 is made of synthetic resin, metal, etc.
Inside this housing 1, two nickel-cadmium storage batteries 4, 5 electrically connected in series are arranged, and the nickel-cadmium storage battery 4, which is the high voltage side of the nickel-cadmium storage batteries 4, 5, is arranged. The terminal 6a is connected to a positive electrode 2 provided on the cylindrical upper surface of the housing 1 and made of a pressed metal material or the like. On the other hand, the nickel cadmium storage battery, which is the low voltage side of the nickel cadmium storage batteries 4 and 5,
The terminal 6b of the cadmium storage battery 5 is connected to the notch 1
It is electrically connected to an electrode piece 7 fixed to a portion of synthetic resin or the like filled inside the electrode 4. The electrode piece 7 is connected to the changeover switch 8 provided in contact with the back surface of the notch 14 formed in the housing 1.
A diode lead terminal 10 and an electric wiring 11 are connected to the changeover switch 8. The diode lead terminal 10 is connected to the diode 9 that is engaged with the synthetic resin filled inside the notch 14 at the bottom of the housing 1, while the electrical wiring 11 is provided on the cylindrical bottom of the housing 1. Similarly to the positive electrode 2, the negative electrode 3 is connected to a negative electrode 3 which is made of a pressed metal material or the like. The other diode lead terminal 12 of the diode 9 that is not connected to the changeover switch 8 is connected to the negative electrode 3 in the same way as the electric wiring 11 described above. In addition, when the housing 1 is formed of a material such as metal, the above-mentioned positive electrode 2 and negative electrode 3 can be used by interposing an insulator between these electrodes 2, 3 and the housing 1 to prevent short-circuiting between the two. It can be prevented.

The operation of this rechargeable power supply device will be explained with reference to the equivalent circuit shown in FIG. Since the voltage supply source of the rechargeable power supply device according to the present invention is based on a nickel-cadmium storage battery 4,5, compared to a commonly used manganese dry battery, it can be used many times, that is, in a normal case.
It is possible to repeat charging and discharging approximately 300 to 500 times. Also, due to the characteristics of nickel-cadmium storage batteries, the voltage drop is less than that of manganese dry batteries even during continuous discharge. Therefore, it can withstand continuous discharge for a long time. Since the nickel-cadmium storage batteries 4 and 5 are electrically connected in series, the voltage at both ends becomes approximately 2.4V, and in electronic equipment whose power source is a dry cell battery with a rated voltage of 1.5V, the voltage will drop. Therefore, a diode 9 arranged in the first current path is used to obtain the desired voltage. A changeover switch 8 as shown in FIG. 3 is provided between the nickel-cadmium storage battery 5 and the electrode 3, and this changeover switch 8 enables switching to the second current path 11. This second current path 11 functions as a bypass, and by using this second current path 11, charging without waste of voltage is possible, and the 2.4 V of the nickel cadmium storage batteries 4 and 5 connected in series is possible. It is also possible to extract a voltage of approximately As a modification of the circuit configuration shown in FIG. 3, a switch 18 may be provided in parallel with the diode 9 as shown in FIG.
These switch 8 and switch 18 are
As shown in FIG. 2, the switching operation can be performed using the tip of a writing instrument 15 such as a ballpoint pen or a sharpie pen.

FIG. 5 shows a second embodiment of the present invention;
The difference from the above embodiment is that a changeover switch is not used in the circuit, and two diodes 24 and 25 are connected with opposite polarity terminals to form a voltage drop element. In this case, a changeover switch is not required and a simpler structure can be achieved.

The rechargeable power supply device according to the present invention can be used as a power source for the above-mentioned portable stereo cassette recorder, portable videotape recorder, small camera, etc., and can be used for a sufficiently long time. . In addition, if the electronic device is a device that requires 6V, for example, it is designed to be able to store four dry batteries, and at least one of them should use the rechargeable power supply device of the present invention, and the switch 8 or switch 18,
You can set it on the side where the voltage of the nickel-cadmium storage batteries 4 and 5 can be extracted directly, or use a nickel-cadmium storage battery with a nominal voltage of 1.2V in the shape of a standard dry battery, a dummy battery with the positive and negative electrodes shorted, or a normal battery. It is also possible to use a dry battery and a rechargeable power supply device according to the present invention in combination and adjust the voltage to a desired voltage.

In addition, the storage battery explained in the embodiment of the present invention is
It is not limited to nickel-cadmium storage batteries, and other alkaline storage batteries such as lead-acid batteries can also be used, and two or more storage batteries can be connected in series as required. It is. Further, as the diode, not only the diode as described in the embodiment, but also a diode-connected element such as a transistor can be used.

In addition, the changeover switch 8 and switch 18 are
As described above, the notch 14 is provided, but as shown in FIG. The bottom of the cylinder itself can also be used as a rotary switch 19. In this case, the switch 19 is opened and closed by rotating the switch 19, which is a cylindrical bottom part, left and right with respect to the housing 16.

JIS used for the shape of casing 1 and casing 16
Standard dry batteries include so-called AA, AA, AA, AAA, AAA, and AAA batteries (UM-1 to UM-5), as well as 006P type dry batteries with a nominal voltage of 9V. can give.

[Effect of idea]

By using the rechargeable power supply device according to the present invention in places where dry batteries were conventionally used, electronic devices and the like can be operated normally for a sufficiently long time compared to dry batteries, which have a significant voltage drop. Furthermore, by using the diode that adjusts the discharge voltage, a voltage equivalent to the terminal voltage of the dry battery can be obtained relatively stably against changes in the current value. Furthermore, a second current path switchable for the first current path is provided with a diode functioning as such a voltage drop element.
Since the current path is provided, the diode in the first current path can be protected and sufficiently charged, and the voltage of the storage battery can also be directly taken out to the electrode of the casing.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure of a rechargeable power supply device explained in the first embodiment of the present invention, FIG. 2 is an external perspective view of the rechargeable power supply device, and FIGS. is an equivalent circuit diagram of the rechargeable power supply device described above, FIG. 5 is an equivalent circuit diagram of the rechargeable power supply device explained in the second embodiment of the present invention, and FIG. 6 is an equivalent circuit diagram of the rechargeable power supply device described in the second embodiment of the present invention. It is an external perspective view of the rechargeable power supply device. 1... Housing, 4, 5... Nickel cadmium storage battery, 8... Changeover switch, 9... Voltage drop element (diode).

Claims (1)

[Scope of utility model registration request] Multiple storage batteries connected in series are housed in a housing that has the external dimensions and shape of standard dry batteries,
First and second current paths that are switched between one terminal of the storage battery and the electrode of the housing are formed, and a diode that adjusts the discharge voltage is installed in the first current path within the housing. A rechargeable power supply device that is housed and installed.