JPH04281333A - Power supply system - Google Patents

Abstract

PURPOSE:To provide an external power supply system for an electronic appliance employing a battery in which the battery is operated efficiently and the operating time of the electronic appliance is prolonged. CONSTITUTION:The power supply system comprises a first internal/external switch 2 and a first input switch 12 for switching between a battery 11 and a built-in battery 1, and a second internal/external switch 7 and a second input switch 9 for switching between a battery 8 and a power supply comprising a DC-DC converter 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying an external power source to electronic equipment using a battery as a power source.

0002

[Prior technology] Pocket radio, headphone stereo,
Portable CD players and the like are rapidly becoming popular and these devices are becoming smaller and lighter. As a result, the number of devices powered by one or two dry batteries is also increasing. However, dry battery 1
Since the voltage is low in the case of only 300 volts, there are limits to the configuration of the electric circuit, and there are also restrictions on the design of the mechanism drive system. Therefore, a DC-DC converter is usually used to boost the voltage to the required level and also to stabilize it.

0003

[Problems to be Solved by the Invention] The step-up DC-DC converters that are often used in such conventional battery-powered small devices are expensive even though they have a high conversion effect, and generally have a considerable amount of conversion loss. occurs. On the other hand, since the battery itself has been miniaturized, its capacity is small. These lead to a reduction in the operating time of the equipment.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a power supply device that increases the efficiency of using batteries and enables long-term operation of equipment.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a first internal/external switch and a first input switch for switching the first battery to the built-in battery, and a second input switch.
The device is equipped with a second internal/external switch and a second input switch for switching between the battery and the power generated within the device.

[0006]

[Operation] With the above-described structure, the present invention can directly supply power to equipment without loss when using the second battery.

[0007]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 3. In FIG. 1, when the power switch 3 is closed, the built-in battery 1 is boosted by the DC-DC converter 4 via the first input switch 12, and is supplied to the load 6 via the second input switch 9. Here, the DC-DC converter output voltage will be referred to as the second power supply voltage, and the built-in battery voltage will be referred to as the first power supply voltage. The second battery 8 is a battery having a terminal voltage equivalent to the second power supply voltage, and when this second battery 8 is inserted into the jack of the second internal/external switch 7, the second input switch 9 is opened, and the second battery 8 supplies power to the load 6 instead of the DC-DC converter 4. In this way, the second power supply voltage can be supplied by the external second battery 8. In this case, since the load 6 is directly connected to the second battery 8, the battery usage efficiency is high.

On the other hand, the first power supply voltage can also be supplied from outside. The first battery 11 is a battery having a terminal voltage equivalent to the first power supply voltage, and when this first battery 11 is inserted into the jack of the first internal/external switch 2, the first input switch 12 contacts are opened, and the first battery 11 can replace the built-in battery 1 and supply power to the DC-DC converter 4.

As described above, according to the power supply device of the embodiment of the present invention, the internal/external switch and the input switch are connected to the first power supply voltage (low voltage) side and the second power supply voltage (high voltage) side, respectively. This makes it possible to supply power from an external battery. In particular, when the second power supply voltage is provided by an external battery, the battery is used more efficiently because it is directly connected to the load.

FIG. 2 is a perspective view showing the external appearance of an embodiment of the present invention, in which external batteries 8, 11 for battery-driven equipment 10 are shown.
The connection method is illustrated. Jack 2a is battery 11
The jack 7a is for connecting the battery 8.

[0011]

[Effects of the Invention] As is clear from the above embodiments, according to the present invention, two types of external power sources can be easily used, and especially when a high voltage power source is provided by an external battery, it does not pass through a DC-DC converter. Therefore, it is possible to provide a power supply device that has no conversion loss, has high battery usage efficiency, and has a long battery life.

[Brief explanation of the drawing]

FIG. 1: Circuit diagram of a power supply section of an electronic device using a power supply device according to an embodiment of the present invention.

[Fig. 2] A perspective view showing the external appearance to explain the connection between an electronic device using the device and an external battery.

[Figure 3] Power supply circuit diagram of conventional battery-powered electronic equipment

[Explanation of symbols]

2 First internal/external switch 4 DC-DC converter 7 Second internal/external switch 9 Second input switch 12 First input switch

Claims (2)

[Claims] 1. A first internal/external switch and a first input switch for switching a first battery to a built-in battery;
A power supply device comprising a second internal/external switch and a second input switch for switching between a battery and a power source generated within the device. 2. The power supply device according to claim 1, wherein the power generated within the device is an output voltage source of a DC-DC converter.