JP2000112571A - Power supply starting device on mounting board in electronic equipment - Google Patents

Abstract

(57) Abstract: In an electronic device in which a plurality of sub-boards are detachably mounted on a main board, an abnormal operation of a power supply unit which may occur when the sub-board is inserted is avoided. The present invention provides a male or female connector for mounting a sub-board provided on a main board, and a plurality of connectors provided on predetermined sides of each sub-board and electrically connected to the main board side. The female or male connector 11 fitted with the connector on the main board and the plurality of electrodes C1 and C2 on the sub-board 10 which are spaced apart are arranged on the main board side. Mounting detecting means 31 for detecting that the connection is established
And a control unit 32 for activating the power supply 12 of the sub-substrate based on the detection of the connection of the electrodes on the predetermined sub-substrate 10 by the mounting detection unit 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply starting device on a mounting board in an electronic apparatus in which a plurality of sub-boards are detachably mounted on a main board.

[0002]

2. Description of the Related Art In recent years, in many electronic devices, a system in which a plurality of sub-boards are detachably mounted on a main board has been widely adopted. This type of system has the advantage that the system can be easily changed by selectively mounting sub-boards having different types, functions, performances, etc. on the main board according to changes in user requirements and specifications. There is. This main system is also widely used in communication equipment such as multiplex converters and repeaters, and the number of lines accommodated is changed by replacing a sub-board called a package with a main board generally called a back wire board. The change of the redundant configuration can be easily achieved.

FIGS. 4 and 5 show a block diagram and a circuit diagram on the package side in a conventional multiplex converter. As shown in the figure, in the multiplex converter and other communication devices, each package 10 has a connector section 11 for mounting on a back wire board. A large number of electrodes are arranged in a row along the sides of the connector portion 11. By fitting the connector portion 11 to the female connector on the back wire board side, the electrodes on the package 10 side are connected to the back wire board. The electrodes provided in the female connector on the board side come into contact, and the electrical connection between the back wire board and the package 10 is achieved.

As shown in FIG. 4, in a multiplex conversion device and other communication equipment, each package 10 includes a power supply unit 12 for operating electronic components in each package. When the package 10 is mounted, the power supply unit 12 is supplied with a predetermined voltage (48 V in this example) from the back wire board through the electrodes VA and VB, and the electrode OBPEN
Is connected to the ground terminal on the back wire board side to start up. In such a system, as shown in the figure, usually,
Electrodes VAPre and VBPre configured to achieve conduction before the electrodes VA and VB are provided to avoid overcurrent when the package 10 is inserted.

[0005]

However, if the package is not sufficiently mounted on the back wire board or if the package 10 is fitted to the connector while the package 10 is tilted at the time of mounting, the power supply unit 12 may start up. Had a problem. That is, usually, in this type of mounting structure, care is taken so that the activation electrode OBPEN is not conducted before the power supply electrodes VA and VB are conducted. Depending on the manner, the electrode OBPEN may accidentally conduct before the electrodes VA and VB. In such a case, the electrodes VAPre and VBP
The power supply unit 12 starts up with the voltage of 48 V supplied from re. As a result, a voltage drop occurs at the resistors R1 and R2, and the voltage at the input terminal of the power supply unit 12 rises by the above-mentioned voltage drop, causing abnormal operation, that is, repeated power on and off.

Accordingly, an object of the present invention is to avoid an abnormal operation of the power supply unit which may occur when the package is inserted.

[0007]

In order to achieve the above object, the present invention provides an electronic apparatus in which a plurality of sub-boards are detachably mounted on a main board. Male and female connectors, and a plurality of electrodes provided on a predetermined side of each of the sub-boards and electrically connected to the main board side are arranged along the side, and are fitted to connectors on the main board. A female or male connector to be combined, a plurality of electrodes in the sub-substrate that are spaced apart from each other, mounting detection means for detecting that the electrodes are electrically connected to the main board side, and the mounting detection means And control means for activating a power supply of the sub-substrate based on detection of connection of the electrode on a predetermined sub-substrate.

Here, the plurality of electrodes on each of the sub-boards are first electrically connected to the main board side when the connector on the sub-board is fitted to the connector on the main board. , A second group to be connected next, and a third group to be connected last, and the plurality of electrodes to be detected by the mounting detecting means are those of the third group. It is preferable that

In the present invention, the mounting detection means and the control means may be provided on a predetermined sub-board.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings. FIGS. 1 and 2 show a block diagram and a circuit diagram on the package side in a multiplex conversion device equipped with a power supply starting device according to the present invention. In these figures, the multiplex converter can mount a large number of packages 10 on a back wire board 20. Each package 10 includes a power supply unit 12 for operating electronic components in each package, as in the conventional case. The power supply unit 12 includes the package 10
When mounted, the electrodes VA and from the back wire board
A predetermined voltage (48 V in this example) is supplied through VB. Further, as in the conventional case, this electrode VA
And an electrode configured to achieve conduction prior to VB
VAPre and VBPre are provided to avoid overcurrent when the package 10 is inserted.

Each package 10 has a connector section 11 as a connection structure to the back wire board 20.
A large number of electrodes are arranged in a row along the sides of the connector portion 11. By fitting the connector portion 11 to the female connector on the back wire board 20 side, the electrodes on the package 10 side are The electrode provided in the female connector on the wire board side comes into contact, and the electrical connection between the back wire board and the package 10 is achieved.

FIG. 3 shows a connector 1 of each package 10.
1 is an enlarged view of FIG. As you can see in this figure,
In the connector section 11, three types of electrodes having different lengths (hereinafter, referred to as electrodes L, M, and S, respectively, from long ones) are arranged. As shown in the figure, the electrode L reaches the end of the package 10, and the distance from the end of the package 10 is increased in the order of the electrodes M and S. As described above, by changing the lengths of the electrodes, when the package 10 is inserted into the back wire board 20, the order in which electrical continuity is established, that is, the order in which the electrodes are brought into contact with each other is set in three stages. It becomes possible to divide. That is, when the package 10 is inserted, first, the electrode L is connected to the back wire board 2.
Conduction is performed to the 0 side, then the electrode M, and finally, the electrode S is conducted.

FIGS. 1 and 2 show which of the above-mentioned electrodes in the package 10 belongs to which of the above-mentioned electrodes by adding symbols L, M and S. As shown in the figure, the ground G is L, and is first conducted when the package is mounted. Next, the electrodes VAPre and VBPre are at M, and are then turned on. And finally, electrodes VA, VB, OBPRC and electrode C
1, C2 is conducted. Here, the electrode OBPRC is C
These electrodes are used to activate the power supply unit 12 from the PU mounting package 30.
0 is connected to the electrode OBPEN via the line 21 on the back wire board 20. The electrodes C1 and C2 are connected on the package 10, and when mounted on the back wire board 20, the electrode C1 is grounded, and the electrode C2 is connected to the electrode LV of the CPU mounting package 30. Connector part 11
The electrode C1 and the electrode C2 are arranged at positions sufficiently separated from each other. In one embodiment, both electrodes
C1 and C2 can be used as electrodes on both ends of the connector section 11.

In the present embodiment, the back wire board 20 can mount the CPU mounting package 30 on its predetermined connector. The CPU-equipped package 30
This package has a function for activating the power supply unit 12 mounted on the package 10. That is, C
The PU mounting package 30 includes an operational amplifier 31 as mounting detection means, a CPU 32 as control means, and a switch 33. The operational amplifier 31 is for detecting that the package 10 is securely mounted on the back wire board 20. The input terminal of the operational amplifier 31 is connected to the electrode LV. This electrode LV is formed by securely mounting the package 10 on the back wire board 20 and conducting the electrodes C1 and C2 to the back wire board side. , Grounded. As a result, the input of the operational amplifier 31 becomes the ground level.

The CPU 32 controls on / off of the switch 33 according to the output level from the operational amplifier 31.
When the output level from the operational amplifier 31 is higher than a predetermined threshold, that is, “High”, the switch 3
3 is turned off, and when it is low, that is, when it is "Low", the switch 33 is turned on. Package 10
Is securely mounted on the back wire board 20,
The input terminal of the operational amplifier 31 becomes the ground level, which is amplified and given to the CPU 32, and the switch 33 is turned on. The switch 33 is connected to an electrode OBPEN that is electrically connected to the electrode OBPRC of the package 10. When the switch 33 is turned on, the power supply unit 12 on the package 10 is activated.

In the above configuration, it is assumed that the package 10 is incompletely inserted into the back wire board 20. When the package 10 is inserted obliquely with respect to the connector of the back wire board 20, some electrodes of the connector portion 11
May not be conducted to the side. In the package 10 according to the present embodiment, the electrodes C1 and C2 are arranged at positions separated from each other, and since the electrodes C1 and C2 are the electrodes S of the group that is finally conducted, the mounting of the package 10 is incomplete. In this case, at least one of them does not conduct.
In this case, the operational amplifier 31 of the CPU mounting package 30
Output the "High" level, and the CPU 32
Keeps the switch 33 in the off state. Therefore, when the package 10 is not sufficiently mounted, the power supply unit 12 is not activated, and an operation abnormality due to a voltage drop does not occur.

On the other hand, when the package 10 is completely mounted on the back wire board 20, both the electrodes C1 and C2 conduct. As a result, the output of the operational amplifier 31 of the CPU-mounted package 30 changes to “Low” level, and the CPU 32 detects this and switches the switch 33 on. When the switch 33 is turned on, the power supply unit 12 of the package 10 is started for the first time.

The embodiment of the present invention has been described with reference to the drawings. However, it is apparent that the present invention is not limited to the matters described in the above embodiments, and that changes, improvements, and the like can be made based on the description in the claims. In the above embodiment, the operational amplifier 31, the CPU 32, and the switch 3
Although the example in which 3 is mounted on another package is shown, these may be provided on the back wire board 20 to constitute the present invention.

[0019]

As described above, according to the present invention, when the sub-substrate is not securely mounted on the main substrate, the power supply on the sub-substrate is not activated, so that the incomplete Abnormal operation of the power supply due to mounting can be avoided.

[Brief description of the drawings]

[0020]

FIG. 1 is a configuration block diagram on a package side in a multiplex conversion device equipped with a power supply activation device according to the present invention.

FIG. 2 is a circuit diagram of FIG.

FIG. 3 is an enlarged view showing a connector portion of the package.

FIG. 4 is a configuration block diagram on the package side in a conventional multiplex conversion device.

FIG. 5 is a circuit diagram of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Package 11 Connector part 12 Power supply unit 20 Back wire board 30 CPU mounting package 31 Operational amplifier 32 CPU 33 Switch

Claims (3)

[Claims] An electronic device in which a plurality of sub-boards are detachably mounted on a main board, wherein the male or female connector for mounting the sub-board provided on the main board, and a predetermined connector of each of the sub-boards are provided. A female or male connector fitted to a connector on the main board, wherein a number of electrodes provided on the side and electrically connected to the main board side are arranged along the side; and a position on the sub-board. Mounting detection means for detecting that a plurality of electrodes that are electrically separated from each other are electrically connected to the main board side; and that the connection of the electrodes on a predetermined sub-board is detected by the mounting detection means. And a control unit for activating the power supply of the sub-board based on the following. 2. A method according to claim 1, wherein a plurality of electrodes on each of the sub-boards are first electrically connected to the main board when the connector on the sub-board is fitted to the connector on the main board. A plurality of electrodes which are divided into a group, a second group to be connected next, and a third group to be connected last, and a plurality of electrodes to be detected by the mounting detection means are referred to as those of the third group. 2. The power supply starting device on a mounting board in an electronic device according to claim 1, wherein: 3. The mounting detection means and the control means,
3. The power supply starting device on a mounting board in an electronic device according to claim 1, wherein the power starting device is provided on a predetermined sub-board.