JPH04150728A - Power supply - Google Patents

Abstract

PURPOSE:To make possible to charge a battery while feeding power to an electric appliance by providing means for charging a battery to be mounted when an electric appliance is carried. CONSTITUTION:A power supply circuit 21 converts a commercial power supply V1 into a DC power supply 11 which then feeds power through a DC cable 5 to a DAT 10 body and a charging current control circuit(CCC) 23. A current detecting circuit 24 detects current flowing when the DC cable 5 is connected with the DAT 10 and the DAT 10 is operating and the current detecting circuit 24 delivers a current detection signal 12 to a timer circuit 25. Furthermore, a safety switch 28 detects mounting of 8 battery 2 and delivers a mounting detection signal C3 to the timer circuit 25. which then delivers a charge control signal C1 to the CCC 23 for a predetermined time. Consequently, the CCC 23 generates a predetermined charging current for an interval corresponding to the charge control signal C1 thus charging the battery 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply device, and is particularly applicable to a device that converts a commercial power source into a DC power source and supplies it to a portable electronic device.

B Summary of the Invention The present invention provides a power supply device that controls the supply of charging current to a battery according to the supply status of DC power to electronic equipment, thereby converting commercial power and supplying DC power to electronic equipment. The battery can be charged while supplying power, and a safety switch that is operated when the battery is installed detects that the battery is securely installed and supplies charging current to the battery, making it safer. It can significantly improve your sexuality.

C. Prior Art Conventionally, portable electronic devices such as camera-type video tape recorders (VTRs) have been equipped with rechargeable batteries that generate the desired DC power, making them easy to use outdoors when commercial power is not available. It is designed to allow you to enjoy shooting and playing back recordings.

Conversely, indoors where commercial power can be used, a power supply device called a power adapter is used to convert the commercial power into the desired DC power and supply it to the camera-integrated VTR, without worrying about battery consumption. It is designed to allow you to enjoy long-term shooting and recording playback.

In addition, such a power supply device has a configuration in which a battery can be installed in the same way as a camera-integrated VTR, so that by installing a battery while power is not being supplied to the camera-integrated VTR, , a predetermined charging current is supplied to the battery so that the battery can be charged.

By adding a battery charging function to the power supply device in this way, it is possible to reduce the number of accessories for the camera-integrated VTR, thereby improving usability for the user.

Problem to be Solved by the Invention However, in the power supply device having such a configuration, the battery can be charged even when power is not being supplied to the camera-integrated VTR. When using a VTR, there is a problem in that another charged battery must be used, and the usability for the user is still insufficient.

In addition, in a power supply device with such a configuration, a camera-integrated V
There are some that use a switch to switch between supplying power to the TR or charging the battery.
In such a case, if the changeover switch is switched to the battery charging side with no battery installed, a person may come into contact with the exposed contact pins or other electrodes and receive an electric shock, or a metal object may come into contact with them and cause a short circuit. There was a problem with the power supply itself being damaged.

The present invention has been made in consideration of the above points, and aims to solve the conventional problems at once and propose a power supply device that can charge a battery while supplying power to an electronic device.

Ell! Means for Solving In order to solve the problem, in the first invention, the commercial power supply v1 is converted into the desired DC power supply ■1 to power the electronic device 10.
In the power supply device 1, a battery 2 that is attached when the electronic device 10 is carried is attached, and charging means 21.23.
25 is provided, and the battery 2 is charged at the same time as the DC power supply 1 is supplied to the electronic device 10.

Further, in the second invention, the charging means 21.23.24
．． 25 controls the supply of the charging current I3 to the battery 2 in accordance with the supply status (2) of the DC power supply 11 to the electronic device 10.

By charging the battery 2 at the same time that the 1-acting DC power source 11 is supplied to the electronic device 10, user-friendliness can be improved, and the charging current I3 for the battery 2 can be improved.
Supply status I of DC power supply ■1 to electronic equipment 10
By controlling according to 2, the commercial power supply v
1, the battery 2 can be charged at the same time while reliably supplying the DC power source 1 to the electronic device IO.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a power supply device, and a battery 2 is attached to the upper end surface.By inserting a power plug 4A provided at the end of a power cable 4 into an indoor power outlet 3, a predetermined charging current is applied to the battery 2. The battery 2 can be charged by supplying the same.

In addition, in this power supply device 1, even when the battery 2 is being charged, the DC
By inserting the plug 5A into the power input terminal 11 of a digital audio tape recorder (DAT) 10 as a portable electronic device, a desired direct current source can be supplied to the DATIO.

Note that this DATIO is provided with a top lid 12 that can be opened and closed at the center of the top surface, and a user opens this top lid 12 to load a tape cassette.

In addition, controls 13A to 13H for playback, recording, fast forwarding, rewinding, etc. are arranged at the tip of the top surface of the DATIO, and by operating these controls 13A to 13H as necessary, the user can open the tape cassette. It is possible to record and play back desired music programs and the like.

In addition, a window 1 bored in the center of the upper cover 12 of DATl 0.
4 is fitted with a liquid crystal display panel 15, and this liquid crystal display panel 15 displays the remaining amount of tape in the loaded tape cassette, the overall operation mode of DATIO, etc., so that the user can easily check the remaining amount of tape and the operating mode of the entire DATIO. The operating mode etc. can be visually confirmed.

In addition, the front of DATIO is provided with a power switch 16, an earphone jack 17, and playback and recording volume adjustment controls 18A and 18B, and on the left side, a plug terminal 19 for analog audio signal input/output and a plug terminal 19 for digital audio signal input/output are provided. A 7-pin terminal 20 is provided so that audio signals input and output through the plug terminal 19 or the 7-bin terminal 20 can be recorded and reproduced.

Also, the battery 2 can be attached to the back of this DATl 0, and if the battery 2 is attached like this,
Instead of the power supplied from the power supply device 1 via the power input terminal 11, the DC power supplied from the battery 2 is used to
ATIO is driven.

As a result, this DATIO allows you to easily enjoy photographing and playing back recordings even when you carry it outdoors where commercial power is not available.

Here, the power supply device 1 of this embodiment has a circuit configuration as shown in FIG. It is input to the supply circuit 21.

The power supply circuit 21 connects the commercial power supply ■1 to a predetermined DC power supply 11.
This is supplied to the DATIO main body through one end 22A of the power output terminal and the DC cable 5, and is also supplied to the charging current control circuit 23.

Note that the other end 22B of the power output terminal is grounded through a current detection circuit 24 including a current detection resistor, so that the current detection circuit 24 connects the DC cable 5 to DATl.
0 and detects the current flowing when DATIO is in the operating state, and sends this to the timer circuit 25 as the current detection signal I2.

This timer circuit 25 is configured to send a first charging control signal C1 to the charging current control circuit 23 during a predetermined charging period, and as a result, the charging current control circuit 23 receives the first charging control signal C1. A predetermined charging current I3 is generated for a period corresponding to C1 and is supplied to the battery 2 through one end 26A of the charging terminal, whereby the battery 2 is charged with the charging current 13.

The other end 26B of the charging terminal is connected to the battery 2 and grounded, and the charging current I3 is also supplied to the voltage detection circuit 27, so that when it is detected that an overvoltage has occurred based on the discharge state of the battery 2, etc. , charging current control circuit 2
A second charging control signal C2 is sent to the battery 2 to limit the value of the charging current I3, thereby preventing the possibility of overvoltage being applied to the battery 2.

In addition, the power supply device 1 of this embodiment is configured with a safety switch 28 that detects that the battery 2 is attached, and this safety switch 28 detects that the battery 2 is attached and generates an attachment detection signal. Generate C3 and timer circuit 2
Send on 5th.

In practice, the timer circuit 25 starts a timer counting operation corresponding to a predetermined charging period based on this attachment detection signal C3, and also starts a timer count operation corresponding to a predetermined charging period based on the first current detection signal I2.
It detects whether or not l0 is in an operating state, generates a first charging control signal CI that limits the charging current according to this, and sends it to the charging current control circuit 23.

In this way, in the ta device l of this embodiment, the DAT
The DC power supply ■1 is supplied to the IO and the battery 2 can be charged at the same time, but if these are carried out at the same time, the charging current I3 to the battery 2 is limited and the DATl 0 The DC power supply 11 for the DATl 0 is secured preferentially so that the normal operation of the DATl 0 is not hindered.

Therefore, DATIO is simultaneously and continuously charged as battery 2 is charged.
When the DC power supply 11 is supplied to the battery 2, the battery 2 is normally sufficiently charged in about one hour.
Charging time of about 2 hours is required.

Also, while charging the battery 2, for example, DAT for about 10 minutes.
When DC power supply 11 is supplied to IO, this! 1 DAT
The charging time becomes longer depending on the amount of time 10 is used.

Here, a substantially rectangular recess 30 is formed in the upper end surface IA of this power supply device 1 to attach the battery 2 thereto.

In this concave portion 30, a contact pin 31 is planted in the center thereof and is pushed upward according to the charging terminals 26A and 26B and is urged upward by a spring, and locking portions 32A in the shape of predetermined claws are provided at the four corners. ~32D are integrally formed.

Further, on the lower end surface 2A of the battery 2, a protrusion 33 having a substantially rectangular shape corresponding to the recess 30 formed on the upper end surface IA of the power supply device 1 is formed.

In this convex portion 33, a contact plate 34 is arranged in the center at a position corresponding to the contact pin 31 of the concave portion 30, and locking portions are provided at the four corners with predetermined claw shapes corresponding to the locking portions 32A to 32D of the concave portion 30. 35A to 35D are integrally formed.

As a result, the lower end surface 2A of the battery 2 is pressed against the upper end surface IA of the power supply device 1 as shown by arrow a, thereby engaging the concave portion 30 of the power supply device 1 and the convex portion 33 of the battery 2. By shifting in the direction indicated by the arrow, the locking portions 32A to 32D of the recess 30 lock to the locking portions 35A to 35D of the convex portion 33, and thus the battery 2 is reliably attached to the power supply device 1.

At this time, the contact pin 31 is pressed against the contact plate 34 of the battery 2, thereby electrically and reliably connecting the battery 2 to the power supply device 1.

In the case of this power supply device 1, as shown in FIG. 4, a slide bin 37 constituting the operator of the safety switch 28 is protruded into the mold hole 36 when molding the locking part 32B of the recess 30. There is.

As a result, when the battery 2 is installed as described above, the locking portion 35B of the battery 2 slides the slide bin 37 in the direction of the arrow C, thus making it possible to reliably detect that the battery 2 is installed. There is.

In the above configuration, by attaching the battery 2 to the upper end surface IA of the power supply device 1 and inserting the power plug 4A of the power cable 4 into the indoor power outlet 3, a predetermined charging current 3 is supplied to the battery 2. Then, the battery 2 can be charged.

Also, at this time, connect the DC plug 5A of the DC cable 5 to DAT.
By inserting it into the power input terminal 11 of the IO, it is possible to charge the battery 2 and simultaneously supply the desired DC power 11 to the DATiO.

Note that this power supply device l supplies DC power to DATIO.
i It is controlled within the device 1, thus greatly improving usability for the user.

This power supply device 1 also has a safety switch 28, which detects that the battery 2 is securely attached and supplies charging current I3 to the charging terminals 26A and 26B, thereby supplying the exposed contact bin 31 with the charging current I3. Even if a human body or a metal object comes into contact with it, the risk of electric shock or the risk of circuit short-circuiting and damage to the power supply device 1 can be prevented.

According to the above configuration, the battery 2 is charged at the same time as the DC current 11 is supplied to DATIO, which improves the usability of the user. The power supply device 1 is capable of reliably charging the battery 2 while converting the commercial power source ■1 and supplying the DC power source ■1 to DATIO by controlling it according to the supply status of the power source ■1.
0 can be achieved.

Furthermore, according to the above-described configuration, a safety switch 28 is provided which is operated in accordance with the attachment of the battery 2, detects that the battery 2 is securely attached, and supplies the charging current ■3 to the battery 2.
By supplying power to the power source, it is possible to realize a power supply device 10 that can significantly improve safety.

In the above-described embodiment, the present invention is applied to a power supply device for a digital audio recorder, but the present invention is not limited to this, and can be applied to a camera-integrated video tape recorder, a wireless device, etc., which can be powered by a battery when carried. The present invention is suitable for wide applications in power supply devices for various electronic devices.

H Effects of the Invention As described above, according to the present invention, the battery is charged at the same time as the DC current is supplied to the electronic device, thereby improving usability for the user. By performing control according to the supply status of DC power to the electronic device, it is possible to realize a power supply device that can convert commercial power, reliably supply DC power to the electronic device, and simultaneously charge the battery.

Furthermore, by providing a safety switch means that is operated according to the attachment of the battery, and detecting that the battery is securely attached, charging current is supplied to the battery.
A power supply device that can significantly improve safety can be realized.

In this way, it is possible to obtain a power supply device that can significantly improve usability for the user.

[Brief explanation of the drawing]

FIG. 1 is a route diagram showing an embodiment of the power supply device according to the present invention, and FIG. 2 is a block diagram showing the circuit configuration of the power supply device.
FIG. 3 is a perspective view for explaining how to attach a battery to the power supply device, and FIG. 4 is a sectional view taken along line IV--IV of the power supply device. 1...Power supply device, 2...Battery, 1
0...Digital audio chip recorder,
21... Power supply circuit, 23... Charging current control circuit, 24... Current detection circuit, 25...
...Timer circuit, 28...Safety switch.

Claims (2)

[Claims] (1) In a power supply device that converts a commercial power source into a desired DC power source and supplies it to an electronic device, a battery that is attached when the electronic device is carried is attached, and a charging means that supplies a charging current to the battery to charge the battery. A power supply device, comprising: supplying the DC power to the electronic device and charging the battery at the same time. (2) The charging means is configured to control the supply of the charging current to the battery in accordance with the supply status of the DC power to the electronic device. power supply.