JPH10285829A - Adaptor for ac power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable power supply to a load, even if the power feeding function of an AC power source adaptor stops by service interruption etc., by adding a backup power advice to an adaptor body. SOLUTION: A battery terminal 11 is formed on one side of a cam-operated coder 10. When an AC power source adaptor is used for a cam-operated coder in the curse of collecting data, the plug 14 of a power cable 13 is inserted into a plug socket for AC power sources, and an adaptor 12 is fitted to the battery terminal 11 of the cam-operated coder 10. Then a DC output outputted from the converter circuit of the adaptor 12 is supplied to a load when a secondary battery 16 is fitted to secondary battery connecting terminals 15, charging is performed to an extent capable of compensating the self discharge of the secondary battery 16 supplying power to the load. Power is supplied from the secondary battery 16, since the power supplying function of the adaptor 10 lowers, when the plug 14 of the power cable 13 comes off from an AC plug socket in the cource of collecting data, or when power fails. Consequently, it becomes possible to prevent the interruption of the load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC power adapter applied to portable AV equipment such as a television camera for broadcasting, and more particularly to a power supply for the equipment even when a power failure occurs or a power cord is accidentally unplugged. The present invention relates to an AC power adapter that can supply power.

[0002]

2. Description of the Related Art Conventionally, an AC power adapter used in portable AV equipment such as a television camera for broadcasting has a built-in rectifier circuit for converting AC such as commercial power into DC required for driving electric equipment. DC power can be supplied to an AV device by connecting the AC cable to an AC outlet and attaching the adapter body to a battery terminal of the AV device main body, comprising an adapter main body and an AC cable connected to the adapter main body. It has become.

[0003]

However, since such a conventional AC power adapter does not have a power supply backup function, for example, when an AC power adapter is used for AV equipment at a news gathering site or the like, an AC cable is required. If the AC cable is disconnected from the AC outlet or a power failure occurs, for example, the AV device stops, and the recording of the interview is interrupted. An object of the present invention is to provide an AC power adapter that can supply power to a load even when the power supply function of the AC power adapter is stopped due to a power failure or the like when the AC power adapter is used. With the goal.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a load body constituting a load and a battery terminal provided on the load body, which is detachably mounted to convert AC into DC. An AC power adapter having an adapter body having a built-in converter circuit for supplying the load to the load, wherein the adapter body has a power supply device for backing up power supply to the load when the adapter body is down due to a power failure or the like. It is added.

In the present invention, by adding a backup power supply to the adapter body, power can be supplied to the load from the backup power supply even if the adapter body goes down due to a power failure or the like.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an AC power adapter according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a main part showing a configuration of an AC power adapter, and FIG. 2 is a perspective view showing a state where an adapter main body and a secondary battery for backup are combined. In FIGS. 1 and 2,
Reference numeral 10 denotes a portable AV device such as a broadcast television camera, that is, a camcorder (camera-integrated video recorder) body (corresponding to a load body), and a battery terminal 11 is provided on one side of the camcorder body 10. Is formed. Reference numeral 12 denotes an adapter body detachably attached to the battery terminal 11. One end of a power cable 13 is connected to the adapter body 12, and a plug 14 inserted into an AC power outlet is connected to the other end. I have. A rechargeable battery connection terminal 15 also serving as a charging terminal is provided on a surface of the adapter body 12 opposite to a surface on which the camcorder body 10 is mounted. The rechargeable battery connection terminal 15 is provided with a lithium ion battery. A backup secondary battery (corresponding to a backup power supply) 16 including a battery and a nickel-cadmium battery is detachably mounted. 16A
Is a connection terminal provided on the secondary battery 16 and connected to the power supply connection terminal 15. In this embodiment, an AC power adapter is constituted by the adapter body 12 and the secondary battery 16.

The adapter body 12 has a built-in converter circuit 17 shown in FIG. The converter circuit 17 converts AC into DC and supplies the DC to a load.
After converting the AC of AC 100v to AC 240v to DC, the inverter circuit 171 chops this DC and converts it to AC, a transformer 172 having a primary side connected to an output terminal of the inverter circuit 171, and a transformer 1
The rectifier circuit 173 and the smoothing capacitor 174 for converting the alternating current output to the secondary side of the 72 into a direct current, and the DC output of the converter circuit 17 during normal operation of the converter circuit 17 (adapter body 12) cause the secondary battery 16 to operate. And a switching circuit 175 that supplies power to the load from the secondary battery 16 when the converter circuit 17 goes down. The DC output terminal 176 of the converter circuit 17
Is connected to the DC terminal 176 via the switching circuit 175, and the secondary battery 16 is connected to the connection terminal 178. Note that the connection terminal 178 corresponds to the secondary battery connection terminal 15 that is also used for charging.

The switching circuit 175 turns on when the terminal voltage of the identification resistance element 161 included in the secondary battery 16 is a voltage that identifies the battery as a lithium-ion battery, and charges the lithium-ion battery with an npn-type transistor TR ( And a rectifying element D for preventing backflow for supplying electric charge of a secondary battery (lithium ion battery) to a load by conducting when the adapter body 12 goes down.

In the AC power adapter configured as described above, when the AC power adapter is to be used for the camcorder body 10 during coverage, the plug 14 of the power cable 13 is used.
Into the AC power outlet, and the adapter body 1
2 is attached to the battery terminal 11 of the camcorder body 10. After that, the secondary battery 16 is attached to the secondary battery connection terminal 15 of the adapter body 12. In this state, the DC output from the converter circuit 17 of the adapter body 12 is supplied to the load 20 via the path 31 shown in FIG. At this time, assuming that the secondary battery 16 attached to the adapter body 12 is a lithium ion battery, the built-in identification resistance element 1
The terminal voltage of 61 turns on the transistor TR. Therefore, when the adapter main body 12 is operating normally, the secondary battery 16 is charged to the extent that the self-discharge is supplemented by the path 32 shown in FIG. When a secondary battery composed of a nickel-cadmium battery is mounted on the adapter main body 12, the transistor TR is turned off to prevent charging of the secondary battery.

On the other hand, the plug 14 of the power supply cable 13
When the power is removed from the outlet or the power is cut off, the power supply function of the adapter body 12 is down. Instead, the power is supplied from the secondary battery 16 to the load 20 via the path 33 shown in FIG. As described above, when the AC power adapter is used in a long-time news gathering site, even if the power cable 13 is disconnected from the AC outlet or the power supply function of the adapter body 12 is down due to a power failure or the like, the secondary battery 16 remains intact. Since backup is performed, troubles such as interruption of recording can be prevented.

FIG. 4 shows a converter circuit 1 according to the present invention.
FIG. 17 is a circuit diagram showing another embodiment 7; The difference between this circuit diagram and the converter circuit 17 shown in FIG.
The semiconductor switching element of the switching circuit 175 is MOSFE
It is composed of T. In this embodiment, the same operation and effect as those of the above embodiment can be obtained.

FIG. 5 is a perspective view showing another embodiment of the AC power adapter of the present invention. 5 differs from FIG. 1 in that a second adapter main body 40 is provided separately from the adapter main body 12, and this second adapter main body 40 is detachably attached to the secondary battery connection terminal 15 of the adapter main body 12. It is in the place where it is attached. Reference numeral 401 denotes a power cable of the second adapter main body 40, and 402 denotes a power cable 4
The second adapter main body 40 may have the same internal configuration as that of the adapter main body 12, or may have the switching circuit 175 omitted. In this embodiment, even if the power supply function of the adapter main body 12 goes down, the power can be backed up by the second adapter main body 40 and the adapter main body 12 and the second
Can be operated in parallel. Along with this, double power can be supplied to the camcorder body 10, and in addition to the normal operation of the camcorder body 10,
A certification device such as a spotlight can be used in parallel.

In the above embodiment, the case where the secondary battery 16 is detachably mounted on the adapter body 12 has been described. However, the present invention is not limited to this, and the secondary battery 16 is integrated with the adapter body 12. It may be configured to be assembled to In the above embodiment, the case where a lithium ion battery is used as the secondary battery 16 has been described. However, the present invention is not limited to this, and a nickel-cadmium battery may be used. However, in the case of the nickel-cadmium battery, the charge control is more complicated than that of the lithium-ion battery, and the cost is inferior to that of the lithium-ion battery.

[0014]

As described above, according to the present invention, a backup power supply device such as a secondary battery is added to the adapter body so that the backup power supply device can be used even if the adapter body goes down due to a power failure or the like. Power can be supplied to the load. As a result, even if the power cable is disconnected from the AC outlet or the power supply function of the adapter main unit is down due to a power failure or the like, a problem that the operation of the load is interrupted can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a configuration of an AC power adapter according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where an adapter body and a backup secondary battery are combined in the embodiment of the present invention.

FIG. 3 is a circuit diagram illustrating an example of a converter circuit according to the embodiment of the present invention.

FIG. 4 is a circuit diagram showing another example of the converter circuit according to the embodiment of the present invention.

FIG. 5 is a perspective view showing another embodiment of the AC power adapter of the present invention.

[Explanation of symbols]

10: Camcorder body, 11: Battery terminal, 1
2 adapter body, 15 connection terminal, 16 secondary battery, 17 converter circuit, 175 switching circuit, T
R: Transistor (semiconductor switching element), D:
... Rectifier element.

Claims (8)

[Claims] 1. A load main body comprising a load, and an adapter main body which is detachably attached to a battery terminal provided on the load main body and has a built-in converter circuit for converting AC into DC and supplying the DC to the load. An AC power adapter, characterized in that a power supply device for backing up power supply to the load when the adapter body is down due to a power failure or the like is added to the adapter body. 2. The AC power adapter according to claim 1, wherein the power supply device is constituted by a secondary battery. 3. The AC power adapter according to claim 2, wherein the secondary battery is detachably attached to a charge / connection terminal provided on the adapter body. 4. The AC power adapter according to claim 2, wherein the secondary battery comprises a lithium ion battery. 5. The AC power adapter according to claim 1, wherein the power supply device includes a second adapter body separate from the adapter body. 6. The AC power adapter according to claim 5, wherein the second adapter main body is detachably attached to a power supply connection terminal provided on the adapter main body. 7. The adapter body charges the secondary battery with a DC output of the converter circuit during normal operation of the converter circuit, and supplies power from the secondary battery to the load when the converter circuit goes down. 4. The AC power adapter according to claim 3, further comprising a switching circuit that performs switching. 8. A semiconductor switching element that turns on and charges the lithium ion battery when the terminal voltage of the identification resistance element included in the secondary battery is a voltage that identifies the battery as a lithium ion battery; The AC power adapter according to claim 7, further comprising a rectifying element that conducts when the adapter body goes down and supplies the charge of the lithium ion battery to a load.