JPH09135532A - System board connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a necessity of canceling the power-supplied condition of a mother board in mounting and demounting a system board and improve the handling by mounting and demounting the system board on the mother board without generating discharging, etc., between connectors. SOLUTION: When a mother board 2 is installed on a system board 3, a feed line 13 is completely connected to a power supply line 21 first and then an installation detecting section 22 becomes conducting and then an SSR(solid state relay) 23 is turned on. On the other hand, when the system board 3 is detached from the mother board 2, the conduction of the installation detecting section 22 is canceled and the SSR 23 is turned off before the connection of the feed line 13 to the power supply line 21 is completely cut off. Therefore, the supply of power to the mother board is prohibited. After that, the system board 3 is detached from the mother board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system board connection system including a plurality of system boards and a motherboard to which each system board can be freely attached and detached.

[0002]

2. Description of the Related Art Conventionally, since system boards on which ICs (integrated circuits) and the like are mounted are combined to form one device, each system board can be connected to a motherboard via a connector. Well done. In such a system, each system board has
Usually, power is supplied from the motherboard. That is,
A power supply terminal for supplying power to the system board is provided for each connector on the motherboard. On the other hand, on the connector of the system board, a power supply line is patterned at a position corresponding to the power supply terminal. This power supply line is connected to the power supply circuit on the system board. This power supply circuit generally has a capacitor input type circuit configuration and generates a DC voltage for driving an IC or the like.

[0003]

By the way, when a system board having a capacitor input type power supply circuit is mounted on a mother board, when a power supply is possible on the mother board side, a large amount of power is supplied to the capacitor in the power supply circuit. Inrush current flows in. In such a case, a discharge phenomenon may occur between the power supply line and the power supply terminal during mounting, which may adversely affect the power supply terminal, the power supply line, or the like. Further, electromagnetic noise due to discharge may adversely affect the operation of the system.

On the other hand, in most cases, a plurality of other system boards are mounted on the mother board. Therefore, in order to prevent the operation of the system board from being purposefully stopped, the power supply on the mother board side when the system board is mounted is required. It is preferable not to release the enabled state. In addition, the above-mentioned problem may similarly occur when the mounted system board is removed from the motherboard. That is, discharge may occur between the power supply line and the power supply terminal during removal.

Therefore, an object of the present invention is to solve the above-mentioned technical problems and to allow a system board to be attached or detached without adversely affecting the system operation or the like even when the motherboard is in a power supply state. It is to provide a board connection system.

[0006]

In order to achieve the above object, a system board connection system according to claim 1 is connectable to a mother board having a power supply unit capable of supplying power and the power supply unit. A system board having a power supply unit, wherein the motherboard includes a connection detection unit for detecting a connection state between the power supply unit and the power supply unit, and the connection detection unit for connecting the power supply unit and the power supply unit. And a power switch that allows power to be supplied to the power supply unit in response to detection of completion of connection.

With this configuration, when the system board is mounted on the mother board, power supply is allowed after the connection between the power supply unit and the power supply unit is completed. Therefore, even if the system board is mounted on the mother board when the mother board is in a state where power can be supplied, electric discharge does not occur between the connectors. Therefore, the system board can be mounted without adversely affecting the system operation or the like.

A system board connection system according to a second aspect is the system board connection system according to the first aspect, wherein the power switch connects the power supply section and the power supply section by the connection detection means. It is characterized in that the supply of electric power to the electric power supply unit is prohibited in response to the detection that the space is about to be disconnected.

With this configuration, when the system board is removed from the mother board, power supply is prohibited before the power supply section and the power supply section are completely disconnected. That is, the system board comes off the motherboard after the power supply is cut off. Therefore, the system board can be removed without adversely affecting the system operation or the like.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a schematic configuration of a board connection system to which an embodiment of the present invention is applied, with a part cut away. The board connection system includes a rack 1. A motherboard 2 is fitted on the back surface of the rack 1. On the inner surface of the mother board 2, a plurality of mother side connectors Cm are provided so as to project. A plurality of system boards 3 can be mounted on the inner surface of the motherboard 2 via the mother-side connector Cm.

FIG. 2 is a perspective view showing a schematic structure of the system board 3. On the surface of the system board 3, IC
An electronic component 10 such as (integrated circuit) is mounted. A DC (direct current) power supply circuit 11 is provided on the surface of the system board 3. The DC power supply circuit 11 is for generating a DC voltage for driving the electronic component 10 based on the AC power supplied from the mother board 2, and has a capacitor input type circuit configuration.

A system side connector Cs is formed on one side of the system board 3. The system side connector 12 has two connector parts Cs1 and Cs2. There is a step between the two connector parts Cs1 and Cs2, and the connector part Cs1 projects more than the connector part Cs2. A pair of power supply lines 13 is patterned on the connector portion Cs1. The other end of the power supply line 13 is connected to the DC power supply circuit 11. The system-side mounting detection unit 14 is formed in a pattern on the connector Cs2.

The system board 3 can be mounted on the mother board 2 by fitting the system side connector Cs into the mother side connector Cm. FIG. 3 is a diagram conceptually showing the configuration of the mother board 2, particularly a part relating to any one mother-side connector Cm. The motherboard 2 is provided with a pair of AC power supply lines 20 connected to a commercial AC power supply.

The mother side connector Cm is provided with a contact 30 composed of a first contact 30a and a second contact 30b. The contact 30 includes a pair of patterned power supply lines 21.
And the mother side attachment detection unit 22 are connected to each other. The power supply lines 21 are respectively the power supply lines 1
It is formed at a position corresponding to 3. The mother side attachment detection unit 22 is formed at a position corresponding to the system side attachment detection unit 14. The mother-side attachment detection unit 22 further includes a power supply line 22a and a switch line 22b.

One line of the power supply line 21 is directly connected to one line of the AC power supply line 20. The other line of the power supply line 21 is connected to the other line of the AC power supply line 20 via a solid state relay (hereinafter referred to as “SSR”) 23. The SSR 23 is a contactless relay including a photocoupler and the like, and is turned on when power is supplied to the power supply terminal A. In this embodiment, the power supply to the power supply terminal A is achieved by electrically connecting the power supply line 22a and the switch line 22b that form the mother-side attachment detection unit 22. That is, the power supply line 22
a is connected to the power supply V _cc , and the switch line 22b is S
It is connected to the power supply terminal A of SR23.

FIG. 4 is a cross-sectional view of the mother side connector Cm. Inside the mother-side connector Cm, a contact (leaf spring) 30 including a first contact 30a and a second contact 30b is provided. The contact 30 is normally biased to stop in the state shown in FIG. A board insertion opening 31 having a width wider than the thickness of the system-side connector Cs is formed at the tip of the mother-side connector Cm.

When the system board 3 is mounted on the mother board 2, the system side connector C is inserted in the board insertion opening 31.
Insert while pushing s. As a result, contact 3
0 opens vertically in FIG. 4 and sandwiches the system-side connector Cs. As a result, the system side connector Cs
And the mother-side connector Cm can be electrically connected. At the same time, the system board 3 can be physically attached to the motherboard 2.

FIG. 5 is a diagram for explaining attachment / detachment of the system board 3 to / from the motherboard 2. When about half of the system side connector Cs of the system board 3 is attached to the mother side connector Cm, the power supply line 13 on the system board 3 side and the contact 30 of the mother side connector Cm are connected as shown in FIG. 5 (a). (The shaded area in the figure.) That is, the portion corresponding to the power supply line 13 of the system side connector Cs is the contact 30 (see FIG. 4).
It will be securely sandwiched by As a result, the power supply line 13 and the power supply line 21 are electrically connected.

On the other hand, at this time, the system side mounting detection unit 1
4 and the contact 30 are not connected. Therefore, since the mother side attachment detection unit 22 does not conduct, the SSR
23 is an off state. Therefore, the AC power supply line 20
Is not electrically connected to the power supply line 21, and no AC power is supplied to the power supply line 13. Then, when the system-side connector Cs is completely pushed into the mother-side connector Cm, the system-side mounting detection unit 14 and the contact 30 are connected as shown in FIG. 5B (hatched portion in the figure). As a result, the power supply line 22a and the switch line 22b are electrically connected, and the power supply _Vcc is applied to the power supply terminal of the SSR 23. This turns on the SSR 23. SSR23
When is turned on, the AC power supply line 20 and the power supply line 2
1 becomes conductive, and AC power starts to be supplied to the power supply line 13.

On the other hand, when removing the mounted system board 3 as shown in FIG. 5B from the mother board 2, first, as shown in FIG. Is released. As a result, the SSR 23 turns off. As a result, the electrical connection between the AC power supply line 20 and the power supply line 21 is released. That is, the supply of AC power to the power supply line 13 is prohibited. afterwards,
The power supply line 13 and the power supply line 21 are brought out of conduction.

As described above, according to this embodiment, when the system board 2 is mounted on the mother board 3, AC power is allowed to be supplied after the connection between the power supply line 13 and the power supply line 21 is completed. . Therefore, even if the system board 3 is mounted on the motherboard 2 while the AC power is being supplied to the AC power supply line 20, each connector C
No discharge occurs between s and Cm. Therefore, even when AC power is supplied to the AC power line 20,
The system board 3 can be mounted without adversely affecting the system operation or the like.

When the mounted system board 3 is removed from the motherboard 2, the power supply line 12 and the power supply line 21 are disconnected after the supply of AC power is prohibited. Therefore, even if the system board 3 is removed while AC power is being supplied to the AC power line 20, no discharge will occur between the connectors Cs and Cm. Therefore, even when the AC power is being supplied to the AC power line 20, the system board 3 can be removed without adversely affecting the system operation or the like.

Further, the SSR 23 functioning as a switch for determining whether to permit / prohibit the supply of AC power is provided on the motherboard 2. In other words, there is no need to add any special configuration to the system board 3. When the system board 3 is to be stored in the rack 1, the size of the system board 2 is limited by the standard or the like in most cases, and it may be difficult to mount additional electronic components. Therefore, by providing the SSR 23 on the motherboard 2, the size of the system board 3 can be easily adapted to the standard.

Although the embodiments of the present invention are as described above, the present invention is not limited to the above-mentioned embodiments. For example, in the above embodiment, the system-side connector C
By providing a step on s, the power supply is allowed after the connection between the power supply line 13 and the power supply line 21 is completed. For example, as shown in FIG. 6, the system side connector Cs has a step. Without mother side connector Cm
You may make a step. With this configuration,
Power supply is allowed after the connection between the power supply line 12 and the power supply line 21 is completed.

Further, instead of forming a step on the system side connector Cs, as shown in FIG.
The system-side mounting detection unit 14 may be patterned inside the power supply line 13 without changing the shape of s. Further, instead of forming a step on the mother side connector Cm, as shown in FIG. 8, the length of the contact 30 to which the mother side attachment detection unit 22 is connected is set to the power supply line 21 while the shape of the mother side connector Cm is unchanged. The length may be shorter than the length of the contact 30 connected to.

Further, in the above embodiment, the case where the AC power is supplied from the mother board 2 to the system board 3 is taken as an example, but the present invention is also applied to the case where the DC power is supplied from the mother board 2 to the system board 3. be able to. In addition, it is possible to make various design changes within the scope described in the claims.

[0027]

As described above, according to the first aspect of the invention, since the power supply is allowed after the connection between the power supply unit and the power supply unit is completed, when the motherboard is in the power supply ready state. No electric discharge occurs even if the system board is attached to the motherboard. Therefore, the system board can be mounted without adversely affecting the system operation or the like. Therefore, the system board can be mounted without purposely stopping the operation of other system boards mounted on the motherboard. Therefore, the board connection system can be easily used.

According to the second aspect of the present invention, since the power supply is prohibited before the connection between the power supply section and the power supply section is completely cut off, it is possible to prevent power supply to the motherboard. No electric discharge occurs even if the system board is removed from the motherboard. Therefore, the system board can be removed without adversely affecting the system operation or the like. Therefore, the system board can be removed without purposely stopping the operation of other system boards mounted on the motherboard. Therefore, the board connection system can be easily used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a board connection system to which an embodiment of the present invention is applied.

FIG. 2 is a perspective view showing a schematic configuration of a system board.

FIG. 3 is a diagram conceptually showing a configuration of a motherboard.

FIG. 4 is a cross-sectional view of a mother side connector.

FIG. 5 is a diagram for explaining attachment / detachment of a system board to / from a motherboard.

FIG. 6 is a diagram showing a configuration near a connector of a motherboard and a system board according to another embodiment of the present invention.

FIG. 7 is a diagram showing a configuration near a connector of a system board according to another embodiment of the present invention.

FIG. 8 is a diagram showing a configuration near a connector of a motherboard according to another embodiment of the present invention.

[Explanation of symbols] 2 Motherboard 3 System board 13 Power supply line 14 System side mounting detection unit 20 AC power supply line 21 Power supply line 22 Mother side mounting detection unit 23 SSR Cm Mother side connector Cs System side connector

Claims (2)

[Claims] 1. A mother board having a power supply unit capable of supplying power, and a system board having a power supply unit connectable to the power supply unit, wherein the mother board includes the power supply unit and the power supply unit. Connection detection means for detecting the connection state of, and in response to the completion of connection between the power supply section and the power supply section is detected by the connection detection means,
A system board connection system, comprising: a power switch that permits power supply to the power supply unit. 2. The power switch is connected to the power supply unit in response to the connection detecting means detecting that the connection between the power supply unit and the power supply unit is about to be disconnected. 2. The system board connection system according to claim 1, wherein the supply of electric power of the system board is prohibited.