JPH07320828A - Detachable power source adapter - Google Patents

Abstract

PURPOSE:To provide a power source adaptor which has a simple switching mechanism and can perform on/off control from a device main body allowing no chance of occurrence of electrical damage when the adaptor is attached to and detached from the main body. CONSTITUTION:A power source adaptor 1, of which an output connector 11 and a slide switch 12 performing power source on/off control are provided in the housing, is a detachable type mounted in an equipment main body 2 so as to be free in detaching therefrom. The slide switch 12 is controlled by an operation rod 22 connected to a power switch 21 provided in the equipment main body 2, and has two fixed terminals and moving contactors contact sliding on them. The slide switch 12 takes an on state in the middle of the moving range of the moving contactor and an off state at both ends thereof. Position relationship between the slide switch 12 and the operation rod 22 is set so that the slide switch 12 takes the on state when the output connector 11 is connected to the equipment main body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detachable power supply adapter which is detachably mounted on a device body.

[0002]

2. Description of the Related Art Removable power adapters are often used in various electronic devices such as game machines, personal computers, and video decks. In such a detachable power adapter, if the power switch is provided on the device side, the DC output connection is made with the output connector, and the power on / off operation is provided on the power switch on the body side and the adapter housing. It is preferable to realize it by mechanical interlocking with the switch. As a switch on the power adapter side for that purpose, for example, 3
A terminal slide switch is used.

By the way, when the power adapter is attached to the main body of the equipment, it is necessary that the output connector is first connected to the main body circuit and then the power output is controlled to be turned on. The power adapter must be removed after the power output has been turned off. This is because, if the adapter power supply is turned on and removed, the circuits inside the device body and the adapter, especially the IC, are electrically damaged.

[0004]

However, the ordinary three-terminal slide switch can only be switched between two stages of ON (unlock) and OFF (lock). Therefore, even if this slide switch is attached to the adapter housing so that it can be mechanically turned on / off from the device body side, there is still a possibility that the adapter will be attached / detached while the power output is on.

The present invention is a simple switch mechanism and
It is an object of the present invention to provide a removable power adapter that can be turned on / off from the main body of the device without causing electrical damage due to removal.

[0006]

According to the present invention, there is provided a detachable power supply adapter which is detachably mounted on a device body, wherein an output connector and a switch means for controlling power on / off are provided in a housing. Is a slide switch controlled by an operation rod connected to a power on / off operation means provided on the equipment main body side, and includes two fixed terminals and a movable contact piece that slides in contact with these fixed terminals. The movable contact piece has a first state of ON or OFF at a central portion of a movable range of the movable contact piece and a second state opposite to the first state at both end portions, and the output connector is connected to the device body. It is characterized in that the positional relationship between the switch means and the operating rod is set so as to exhibit the first state.

[0007]

According to the present invention, as a switch means on the adapter side, a slide having a two-terminal structure in which the central portion of the movable range of the movable contact piece is in a first state of on or off and both ends are in a second state. By using a switch, for example, when the adapter is attached or detached, the slide switch must be turned off, and after the adapter is attached to the device body and the output connector is connected, the slide switch must be turned on and the power supply output turned on. You can Therefore, it is possible to prevent the situation where the adapter is removed and electrically damaged in the switch-on state.

In order to realize the same function by using the conventional three-terminal slide switch, for example, the power adapter may be provided with a slide switch for position detection in addition to a slide switch for powering on / off. At this time, the slide switch for position detection is a non-locking type, and when the adapter is mounted on the main body of the device, the output connector is mechanically connected and then comes into contact with the side wall of the main body to be turned on to connect the DC line. Good. However, this complicates the switch mechanism on the adapter side, which is a problem in terms of space and cost. The present invention can be said to be a combination of the functions of the two slide switches described above with one slide switch, and a great advantage can be obtained in terms of space and cost.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a relationship between a removable power supply adapter 1 according to an embodiment of the present invention and a device body 2 to which the removable power supply adapter 1 is attached. The power supply adapter 1 is provided with an output connector 11 in its housing, and a slide switch 12 for performing on / off control of power supply output. The slide switch 12 is of a two-terminal type, the details of which will be described later.
A push button type power switch 21 for turning the power on / off is provided on the device body 2 side, and the slide switch 12 of the mounted power adapter 1 is mechanically controlled in conjunction with the power switch 21. Operation rod 22 for
Is provided.

FIG. 2 is an equivalent circuit of the power adapter 1. A primary rectifier circuit including a diode D1 and a capacitor C1 is provided on the AC line, and a transformer T and an NPN transistor Q1 which is a main switch are connected to the output of the primary rectifier circuit. An oscillator OSC for controlling ON / OFF of the transistor Q1 at a predetermined frequency is provided between the base and the emitter. A rectifying / smoothing circuit including a diode D2 and a capacitor C2 is provided on the secondary side of the transformer T, and its output line is connected to the output connector 11. Between the base and emitter of the transistor Q1,
An NPN transistor Q2, whose base is biased by a resistor R, is inserted. The slide switch 12 is inserted between the base and emitter of the transistor Q2.

When the slide switch 12 is off, the transistor Q2 is on and therefore the main transistor Q1.
Is off, and at this time, the adapter output is off, that is, the power output is not output to the connector 11. Slide switch 12
Is turned on, the transistor Q2 is turned off, and the main transistor Q1 is on / off controlled by the oscillator OSC to obtain a predetermined power supply output.

FIG. 3 shows the construction of the slide switch 12 in this embodiment. As shown in the figure, the slide switch 12 has two fixed terminals 31 and 32 and a movable contact piece 33 that slides on them. The movable contact piece 33 is supported by an insulative slider 34 in the chassis and can be operated by the end of the slider 34 protruding outside the chassis. The slider 34 is biased by a coil spring 35, and its end portion faces the tip end portion of the operating rod 22 that interlocks with the power switch 22 shown in FIG.

A self-locking mechanism using a cam 37 is provided above the slider 34. The locking claw 38 pressed by the spring 39 is operated by the cam 37 by pressing the slider 34, so that two stable points A (as indicated by a broken line in FIG. The lock release state) and B (lock state) are alternately held. After the device is mounted, it is impossible to reach the stable point A of the cam 37 due to the restriction of the device main body wall. Thus, the pseudo stable point A'and the stable point B are alternately held.

FIG. 4 shows three possible states of the slide switch 12 in this embodiment. Attaching the power adapter 1 to the device body 2 and the power switch 21
3 states of (a), (b), and (c) can be taken according to the operation state of. In the movable range of the movable contact piece 33, there are off states shown in (a) and (c) at both ends thereof, and in the central portion, the movable contact piece 33 connects the two fixed terminals 31 and 32 to (b). There is an ON state shown. The off state in FIG. 4A is the self-locking state. 4 (a) (b) (c)
Correspond to the stable points B, A ′, and A, respectively, in correspondence with the cam state shown in FIG.

More specifically, the operation of the slide switch 12 will be described in relation to the connection state of the power adapter. When the power adapter 1 is not attached to the device body 2 alone, the slide switch 12 is shown in FIG.
It is in the non-pressed off state of (c) or in the self-locked off state of FIG. 4 (a). At this time, the transistor Q2 in FIG. 2 is off, and there is no adapter output.

When the power adapter 1 is attached to the device body 2, if the slide switch 12 is originally in the non-pressed state, the slider 34 of the movable contact piece 33 moves the operating rod 22.
4B is brought into contact with the tip of the sheet and is half-pressed, and the state shown in FIG. When the slide switch 12 is turned on, the transistor Q2 in FIG. 2 is turned off and the adapter output is turned on. However, at this time, before the output connector 11 of the adapter 1 is electrically connected to the device main body,
It is necessary that the dimensions and the positional relationship of each part are adjusted so that the state (b) is not turned on.

Normally, the power adapter 1 is the output connector 1
1 can be further pushed in about several mm from the state in which 1 is mechanically and electrically connected to the device body 2. Therefore, in this embodiment, the positional relationship of each part is adjusted so that the slide switch 12 is in the ON state in FIG. 4B when the power adapter 1 is completely attached to the device body 2. Alternatively, the on state of FIG. 4B may be obtained only after the power switch 21 is turned on after the power adapter is attached.

The slide switch 12 is originally shown in FIG.
In the self-locking state (stable point B in FIG. 3) of (a), the slide switch 12 does not become the on state of FIG. 4 (b) only by mounting the power adapter 1. At this time, the power switch 21 is operated to unlock the lock, and the half-pressed state of FIG. 4B turns ON (stable point A ′ in FIG. 3).
Return to. Thereafter, by pressing the power switch 21, the two states of the off state of FIG. 4A and the on state of FIG. 4B are alternately repeated, so that these can be selected at any time. Further, when the power adapter 1 is removed, if the state immediately before that is the OFF state of FIG. 4A, it is removed while holding the state as it is.
If it is in the on state of (b), it shifts to the off state of FIG. 4 (c) in the removal process, and then the connector becomes the non-connection state.

More specifically, FIGS. 5 and 6 show the power switch 21 on the equipment main body side and the operation rod 2 connected to the power switch 21.
FIG. 6 is a diagram for explaining the operation of the slide switch 12 in relation to 2. FIG. 5A shows a state in which the power adapter is not connected, that is, the main body of the device. The movable contact piece 33 is biased to the fixed terminal 32 side by the coil spring 35 and is in a switch-off state, and the end of the slider 34 of the movable contact piece 33 is 1.5 mm away from the adapter case shown by a broken line.
It is out.

When the adapter 1 is attached to the device body 2, as shown in FIG. 5B, the output connector is first turned on (connected state), and the end of the slider 34 comes into contact with the tip of the operating rod 2. The slide switch 12 is turned on. In this state, when the power switch 21 on the main body side is lightly pressed, for example, by 1.5 mm, the slide switch 12 is turned off as shown in FIG. 5 (c), and when the power switch 21 is released, FIG. 6 (a) is displayed. As shown, the slide switch 12 is locked in the off state. When the power switch 21 is strongly pressed, for example, by 2.5 mm as shown in FIG. 6B, the slide switch 12 is unlocked and returns to the ON state of FIG. 5B.

As described above, according to this embodiment, the switch on the adapter housing is used as a two-terminal type slide switch, and the slide switch is turned on after the adapter is mounted on the device body and the output connector is connected. can do. Therefore, it is possible to prevent the situation where the adapter is removed and electrically damaged while the switch is on.

In the above embodiment, the first slide switch is used.
The case where the slide switch is turned on and the power supply output is turned on has been described with the state of 1 being turned on and the second state being turned off.
Depending on the power supply circuit configuration, a combination in which the slide switch is off and the power supply output is on is possible. In this case, the slide switch may be configured to have a first off state at the central portion and a second on state at both ends.

FIG. 7 shows an example of such a slide switch. In this example, two movable contact pieces 33a, 33b are provided corresponding to the two fixed terminals 31, 32. The illustrated state is the central portion of the movable range and is in the switch-off state, and the movable contact pieces 3 are provided at both ends of the movable range.
The fixed terminals 31 and 32 are short-circuited by 3a or 33b to be turned on.

FIG. 8 shows an example of a slide switch having the same function as in FIG. This slide switch includes three fixed terminals 30, 31, 32 and two movable contact pieces 33.
a and 33b. This structure is obtained by a slight improvement in that the movable contact piece of the conventional three-terminal slide switch is separated into two and the cam shape is slightly deformed as necessary. However, the three fixed terminals 30, 3
Of the 1, 32, actually used are the two fixed terminals 31 and 32. The illustrated state is the OFF state at the center of the movable range, and the movable contact pieces 33a are provided at both ends of the movable range.
Alternatively, by 33b, the fixed terminals 31 and 32 are short-circuited and turned on.

The present invention is not limited to the above embodiment. For example, in the embodiment, the slide switch having the self-locking mechanism is used, but a non-locking type slide switch may be used. In this case, a lock mechanism is provided on the power switch on the main body side.

[0026]

As described above, according to the present invention, the switch on the adapter housing is used as a two-terminal slide switch, and the power supply output is turned on after the adapter is mounted on the device body and the output connector is connected. With such a configuration, it is possible to obtain a removable power adapter capable of reliably preventing the situation where the adapter is removed and electrically damaged due to being switched on.

[Brief description of drawings]

FIG. 1 shows a relationship between a power adapter according to an embodiment of the present invention and a device body to which the power adapter is attached.

FIG. 2 shows an example of a power supply circuit of a power supply adapter in the embodiment.

FIG. 3 shows a configuration of a slide switch according to the same embodiment.

FIG. 4 shows an operating state of the slide switch in the embodiment.

FIG. 5 is a diagram for explaining the operation of the slide switch in the embodiment.

FIG. 6 is a diagram for explaining the operation of the slide switch according to the embodiment.

FIG. 7 shows a configuration of a slide switch according to another embodiment.

FIG. 8 shows a configuration of a slide switch according to another embodiment.

[Explanation of symbols]

1 ... Power adapter, 2 ... Device body, 11 ... Output connector, 12 ... Slide switch, 21 ... Power switch, 2
2 ... Operation rod, 31, 32 ... Fixed terminal, 33 ... Movable contact piece, 34 ... Slider.

Claims (1)

[Claims] 1. A removable power adapter detachably attached to a device body, wherein an output connector and a switch device for controlling power on / off are provided in a housing, wherein the switch device is provided on the device body side. A slide switch controlled by an operation rod connected to the power on / off operation means provided, which has two fixed terminals and a movable contact piece that slides in contact with these fixed terminals. The central part of the range has a first state of on or off, both ends have a second state opposite to the first state, and the output connector is connected to the device body to exhibit the first state. A removable power adapter, wherein the positional relationship between the switch means and the operating rod is set as described above.