JPH0786772A - Circuit board equipment - Google Patents

Abstract

PURPOSE:To provide a circuit board equipment capable of reducing noise which is generated by inserting and extracting the contactor for voltage supplying at the time of the hot-line insertion and extraction of a daughter board, and of preventing the malfunction of other circuits. CONSTITUTION:A voltage applying pin 4, a ground pin 6, a plurality of signal pins 8..., and a surge absorber pin 21 are mounted on a mortar board 1. The surge absorber pin 21 is the largest and arranged in the vicinity of the voltage applying pin 4. In addition to an electronic circuit 12, a voltage applying socket 14, a ground socket 16, a plurality sockets 18..., and a surge absorber socket 22 are mounted on a daughter board 10. Further, a surge absorber 24 is mounted, which absorbs a current (noise) produced at the time of the not-line insertion and extraction of the voltage applying pin 4 via the surge absorber pin 21 and the surge absorber socket 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc discharge generated when a contact for a power supply on the mother board side and a contact for grounding and a contact for power supply on the daughter board side and a contact for grounding are connected. The present invention relates to a circuit board device including a surge absorber that absorbs electricity via a dedicated contactor.

[0002]

2. Description of the Related Art FIG. 7 is a conceptual diagram of a conventional circuit board device. A voltage application pin 4 connected to the anode side of the power supply 2, a ground pin 6 connected to the cathode side, and a plurality of signal pins 8 are mounted on the motherboard 1. on the other hand,
An electronic circuit 12, a voltage application socket 14 connected to the electronic circuit 12, a ground socket 16, and a plurality of signal sockets 18 are mounted on the daughter board 10.

When the daughter board 10 is hot-plugged in and removed from the mother board 1, in order to prevent the signal line (not shown) on the mother board 1 from being affected by arc discharge, IEEE
As shown in the standard 896.2, as shown in the drawing, the lengths of the voltage application pin 4 and the ground pin 6 are such that the signal pin 8 for the signal of the plug for connecting the mother board 1 and the daughter board 10 is formed.
It is designed to be longer than the length of.

At the time of insertion, the voltage applying pin 4 and the ground pin 6
Is first inserted and connected to the voltage application socket 14 and the grounding socket 16, so that power is supplied to the electronic circuit 12 and the electronic circuit 12 becomes stable. Then, the signal pins 8 are inserted and connected to the signal socket 18. To be done. On the other hand, at the time of extraction, the signal pins 8 are disconnected from the signal sockets 18 so that the signal lines (not shown) on the motherboard 1 are not affected, and then the voltage application pin 4 and the ground pin 6 apply the voltage. It is separated from the socket 14 and the ground socket 16.

[0005]

However, in the conventional circuit board device, when the daughter board 10 is hot-swapped, the voltage application pins 4 are connected or disconnected while causing the bounding, so that the daughter board 10 is connected.
The rapid conduction interruption of the current flowing through is repeated. Since the mother board 1 or daughter board 10 has some inductive load, a high voltage proportional to dI / dt is generated between the voltage applying pin 4 and the voltage applying socket 14.

An equivalent circuit model of this phenomenon is shown in FIG.
R1 and L1 are mother board 1 or daughter board 1
0 is a resistance and inductance, and R0 is a resistance when the voltage applying pin 4 is not connected, and its value is very large. The transient response of this equivalent circuit model is converted into the back circuit model of FIG. 9 and expressed by the following equation in the frequency domain.

[0007]

[Equation 1] The voltage V (s) generated between the voltage application pin 4 and the voltage application socket 14 can be expressed by the following two equations.

[0008]

[Equation 2] The change v (t) of the voltage in the time domain is expressed by the following three expressions from the first expression and the second expression.

[0009]

[Equation 3] From these three expressions, it can be seen that v (+0) approaches ∞ when R0 approaches ∞.

The voltage generated between the voltage application pin 4 and the voltage application socket 14 due to this phenomenon generates arc discharge or high-frequency electromagnetic wave, propagates on the mother board 1, and becomes arc discharge to become the arc discharge on the mother board 1. A malfunction occurs in a circuit or another circuit on the daughter board 10 in operation.

The present invention has been made in view of the above problems, and reduces arc discharge caused by insertion / removal of a contact for a power supply during hot insertion / removal of a daughter board and prevents malfunction of other circuits. An object of the present invention is to provide a circuit board device that can be used.

[0012]

In order to achieve the above object, the invention according to claim 1 provides a first contactor for power supply to an electronic circuit mounted on a daughterboard side on a mother board side, and a signal contact for signalling. A first contactor is provided on each side of the daughterboard, and a second contactor for the power source that can be inserted into and removed from the first contactor for the power source and a first contactor for the signal are provided on the daughter board side.
In a circuit board device, each of which is provided with a removable second contactor for a signal, an arc discharge is generated when the first and second contactors for the power supply are hot-plugged or hot-plugged. An arc discharge suppressing means for suppressing the arc discharge, a first contact for arc discharge suppressing which is connected to the arc discharge suppressing means and is mounted on either the motherboard side or the daughter board side, and the first contact A second contactor capable of being inserted / removed and mounted on the other of the motherboard side or the daughterboard side for suppressing arc discharge, and the first contactor and the second contactor for suppressing arc discharge are: When the hot wire is inserted, the other first and second contact elements for the power source and the signal are contacted before each other, and when the hot wire is removed, the other first and second contact elements are contacted after the other first and second contact elements. Doing It is characterized by being configured so.

More specifically, the total length obtained by adding the length of the first contactor for suppressing the arc discharge and the length of the second contactor is the first and the first for the other power source and the signal, respectively. It is characterized in that it is set longer than any of the total lengths including the lengths of the two contacts.

Further, according to a fourth aspect of the present invention, the first contactor for grounding is arranged on the mother board side, and the second contactor for grounding can be inserted into and removed from the first contactor for grounding. Is disposed on the daughter board side, and the first grounding is provided.
The contactor and the second contactor come into contact with each other before the first and second contactors for suppressing the arc discharge at the time of inserting the hot wire, and the first for suppressing the arc discharge at the time of removing the hot wire. -It is characterized in that the second contactors are set so that they are in contact with each other further than the second contactors.

[0015]

According to the circuit board device of the first aspect of the present invention configured as described above, when the daughter board is hot-plugged into the mother board, the first and second arc discharge suppressing means are provided.
The contacts are connected to each other prior to the connection of the contacts for power supply and signal. Therefore, the arc discharge (noise or chattering) that occurs when the first and second contacts for the power supply are connected is suppressed by the arc discharge suppressing means, is not propagated to other members, and malfunctions of the electronic circuit are prevented. It can be avoided.

Further, when the daughter board is hot-plugged from the mother board, the first and second contacts for suppressing arc discharge remain connected to each other when the contacts for power supply and for signals are separated. Therefore, the arc discharge generated when the first and second contacts for the power supply are extracted is suppressed by the arc discharge suppressing means and is not propagated to other members as in the case of hot line insertion, so that the electronic circuit Malfunctions can be avoided.

According to the fourth aspect of the circuit board device of the present invention, the first and second contacts for grounding are inserted between the first and second contacts for suppressing arc discharge when the hot wire is inserted. It is done before the connection. And, the first and second for grounding
First and second for suppressing arc discharge after contact is connected
The contacts are connected to each other, and then the power contacts are connected. Therefore, the electronic circuit is prevented from being destroyed by the voltage imbalance that occurs when the contact for the power supply is connected, and the arc discharge is suppressed by the arc discharge suppressing means as described above and propagated to other members. And the malfunction of the electronic circuit can be avoided.

Further, at the time of hot-line drawing, the first and second contacts for suppressing arc discharge remain connected when the contacts for the power supply and the signal are separated from each other, and further, the first contact for grounding. The second contactor and the second contactor remain connected to each other when the connection between the first and second contactors for suppressing arc discharge is separated.

Therefore, the electronic circuit is prevented from being destroyed by the voltage imbalance that occurs when the contact for the power source is connected as in the case of hot insertion, and the arc discharge is absorbed by the arc discharge suppressing means. Therefore, the electronic circuit is prevented from being propagated to other members and the malfunction of the electronic circuit can be avoided.

On the other hand, FIG. 5 shows an equivalent circuit model of the power supply circuit of the mother board and the daughter board using the arc discharge suppressing means (surge absorber) according to the present invention. Arc discharge suppression means by R0 and C0 is surge
It is a typical circuit used as an absorber. R1 and L1 are the resistance and inductance of the daughter board or motherboard. The transient response of FIG. 5 is converted to the back circuit of FIG. 6 and expressed by the following four equations in the frequency domain.

[0021]

[Equation 4] Voltage V (s) generated between male and female contacts for power supply
Is expressed by the following five equations in the frequency domain.

[0022]

[Equation 5] By choosing the values of R0 and C0 from equations 4 and 5,
It is stable under the conditions of the following 6 equations.

[0023]

[Equation 6] The change v (t) of the voltage in the time domain is obtained by the following 7 equations.

[0024]

[Equation 7] In Type 7, the voltage v (+0) generated between the male and female contacts for power supply is applied to both ends of the arc discharge absorption circuit (surge absorber) immediately after the male contact for power supply is disconnected. Then, the generation of voltage is suppressed by passing a current through the arc discharge suppressing means for a moment. The initial value of the voltage at this time is the current i (-
0) and R0 are given by the following eight equations, which can be controlled by appropriately selecting the value of R0.

[0025]

[Equation 8]

[0026]

The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a conceptual diagram showing a schematic structure of a circuit board device according to a first embodiment of the present invention. On the motherboard 1, a voltage application pin 4 connected to the anode side of the power supply 2,
A ground pin 6 connected to the cathode side and a plurality of signal pins 8 ... Are mounted, and a surge absorber pin 21 connected to the anode side of the power supply 2 is also mounted. The surge absorber pin 21 has the longest length, is arranged in the vicinity of the voltage applying pin 4, and allows a current (arc discharge) to flow only momentarily, so a thin pin may be used. The voltage applying pin 4 and the grounding pin 6 are long next to the surge absorber pin 21 and become thick pins to allow a large amount of current to flow. Signal pin 8 ...
Is the shortest and finest pin.

On the other hand, the daughter board 10 has an electronic circuit 12
Is mounted, a voltage application socket 14 connected to the electronic circuit 12, a ground socket 16, and a plurality of signal sockets 18 are mounted, and a surge absorber socket 22 is further mounted. Each socket 14, 1
6 and 18 may have the same stroke. Further, between the surge absorber socket 22 and the electronic circuit 12, a surge absorber 24 that absorbs a current (arc discharge) generated when the voltage application pin 4 is connected is connected. Although the surge absorber 24 is composed of a series circuit of a resistor and a capacitor in this embodiment, it may have another structure.

When the daughter board 10 is hot-plugged into the motherboard 1, first, the surge absorber pins 21 are connected to the surge absorber sockets 22, and the paths connecting the surge absorbers 24 are connected. Next, the voltage application pin 4 and the ground pin 6 are connected, and the arc discharge due to chattering that occurs at this time is absorbed by the surge absorber 24 that is connected in advance, and after the power is stably supplied to the electronic circuit 12, The signal pins 8 ... Are connected.

When the daughter board 2 is hot-plugged from the mother board 1, first, the signal pin 7 is brought into non-contact and the voltage pin 4 and the ground pin 5 are brought into contact with each other before the power supply to the electronic circuit 8 becomes unstable. The surge absorber 24 that is connected to the end absorbs the noise that occurs when disconnected.

FIG. 2 is a conceptual diagram showing a schematic structure of a circuit board device according to a second embodiment of the present invention. In the case of this embodiment, two types of voltage application pins 4a and 4b are provided on the motherboard 1.
Is mounted, and the grounding pin 6'is configured to be the longest, and the two surge absorbers 24 are mounted on the daughter board 10, which is different from the first embodiment.

That is, on the motherboard 1, a voltage applying pin 4a connected to the anode side of the power source 2, a voltage applying pin 4b connected to the anode side of the power source 2 ', a ground pin 6', and a plurality of signal pins 8 are provided. Are mounted, and surge absorber pins 21a connected to the anode side of the power source 2 and the power source 2 are further mounted.
The surge absorber pin 21b connected to the anode side of the 'is mounted. The ground pin 6'is the longest and prevents the electronic circuit 12 'from being destroyed due to voltage imbalance during hot plugging and unplugging due to a plurality of voltages. A thick pin is used as the ground pin 6'for passing a current. The surge absorber pins 21a and 21b are next long, and they are arranged in the vicinity of the voltage applying pins 4a and 4b, respectively, and a current (arc discharge) flows only momentarily. The voltage applying pins 4a and 4b are next to the surge absorber pins 21a and 21b, and are thick pins for supplying a large amount of current. The signal pins 8 ... Are the shortest and thinnest pins.

On the other hand, the daughter board 10 has an electronic circuit 12
′ Is mounted, voltage application sockets 14a and 14b connected to the electronic circuit 12 ′, a ground socket 16 ′,
, A plurality of signal sockets 18 ... Are mounted, and surge absorber sockets 22a and 22b are further mounted. Each socket 14a, 14b, 16 ', 18 ...
22a and 22b may have the same stroke. Further, between the surge absorber socket 22a and the electronic circuit 12 ', a surge absorber 24a that absorbs a current (arc discharge) generated when the voltage applying pin 4a is connected.
Is connected between the surge absorber socket 22b and the electronic circuit 12, and a surge absorber 24b that absorbs a current (arc discharge) generated when the voltage application pin 4b is connected is connected. Surge absorbers 24a, 2
Although 4b is composed of a series circuit of a resistor and a capacitor in the present embodiment, other structures may be used.

When the daughter board 10 is hot-plugged into the mother board 1, the ground pin 6'is first connected to the electronic circuit 12 when a plurality of voltages are unstablely applied.
Prevent the destruction of ´. Next, two surge absorber pins 21
a and 21b are surge absorber sockets 22a and 22b
And the paths connecting the surge absorbers 24a and 24b, respectively. Next, two types of voltage application pins 4a
, 4b are connected, the arc discharge caused by chattering at this time is absorbed by the surge absorbers 24a, 24b connected in advance, and the signal pins 8 are connected after the electric power is stably supplied to the electronic circuit 12 '. To be done.

When the daughter board 10 is hot-plugged from the motherboard 1, first, the signal pins 8 are brought into non-contact with each other before the power supply to the electronic circuit 12 'becomes unstable, and the voltage pins 4a, 4b. The arc discharge generated when the ground pin 6'and the ground pin 6'are disconnected is absorbed by the surge absorbers 24a, 24b connected to the end. After that, the surge absorber pins 21a and 21b are disconnected, and finally the ground pin 6'is disconnected to prevent the destruction of the electronic circuit 12 '.

FIG. 3 is a conceptual diagram showing a schematic structure of a circuit board device according to a third embodiment of the present invention. In the case of this embodiment, the surge absorber pins 21a and 21b are arranged near the voltage application pin 4 and the ground pin 6, respectively, and the surge absorber sockets 22a and 22b corresponding thereto are arranged.
The difference from the first embodiment is that the surge absorbers 24a and 24b are individually connected to each of them.

That is, a voltage application pin 4, a ground pin 6, and a plurality of signal pins 8 connected to the anode side of the power supply 2 are mounted on the motherboard 1, and the power supply is provided near the voltage application pin 4. 2, a surge absorber pin 21a connected to the anode side and a surge absorber pin 21b connected to the cathode side near the ground pin 6 are mounted. The surge absorber pins 21a and 21b have the longest length, and since current (arc discharge) flows only momentarily, thin pins may be used. The voltage applying pin 4 and the grounding pin 6 are surge absorber pins 21a.
, 21b, which is the next longest pin and is a thick pin for passing a large amount of current. In particular, the length of the ground pin 6 may be equal to or longer than that of the voltage applying pin 4. Signal pin 8 ... is the shortest,
It is a thin pin.

On the other hand, the daughter board 10 has an electronic circuit 1
2 ″ is mounted, a voltage applying socket 14 connected to the electronic circuit 12 ″, a grounding socket 16, and a plurality of signal sockets 18 are mounted, and the vicinity of the voltage applying socket 14 and the grounding socket 16 is further mounted. The surge absorber sockets 22a and 22b are mounted on the. The sockets 14, 16, 18, ..., 22a, 22b may have the same stroke. Further, a surge absorber 24a that absorbs a current (arc discharge) generated when the voltage application pin 4 is connected is connected between the surge absorber socket 22a and the electronic circuit 12 ″, and the surge absorber socket 22b and the electronic circuit 12 are connected. A surge absorber 24b that absorbs a current (arc discharge) generated when the ground pin 6 is connected is connected between the "and". Although the surge absorbers 24a and 24b are composed of a series circuit of a resistor and a capacitor in this embodiment, they may have another structure.

When the daughter board 10 is hot-plugged into the mother board 1, first, the two surge absorber pins 21a and 21b are connected to the surge absorber sockets 22a and 2b.
2b, and a path connecting the two surge absorbers 24a and 24b on the voltage application side and the ground side is connected. Next, the ground pin 6 and the voltage application pin 4 are connected, and the arc discharge due to the chattering generated at this time is absorbed by the surge absorbers 24a and 24b connected in advance. At this time, the lengths of the ground pin 6 and the voltage application pin 4 are not equal due to manufacturing error, and even if they are not connected at the same time,
The arc discharge generated by chattering is the ground pin 6
And surge absorber pins 21a and 21b arranged near the voltage applying pin 4 respectively. After the power supply 2 is stably supplied to the electronic circuit 12 ″, the signal pins 8 ... Are connected.

When the daughter board 10 is hot-plugged from the mother board 1, first, the signal pins 8 are brought into non-contact with each other before the electric power supplied to the electronic circuit 12 "becomes unstable, and the voltage pin 4 and the ground pin. The arc discharge generated when 6 is disconnected is independently absorbed on the voltage application side and the ground side by the two surge absorbers 24a and 24b connected to the end.

FIG. 4 is a conceptual diagram showing a schematic structure of a circuit board device according to a fourth embodiment of the present invention. In the case of the present embodiment, the first point is that the surge absorber 24 is connected between the power supply 2 of the motherboard 1 and the surge absorber pin 21.
Is different from the embodiment of FIG.

That is, a voltage applying pin 4 connected to the anode side of the power source 2, a ground pin 6 connected to the cathode side, and a plurality of signal pins 8 are mounted on the motherboard 1.
Further, a surge absorber pin 21 connected to the anode side of the power source 2 is mounted. The surge absorber pin 21 has the longest length, is arranged in the vicinity of the voltage applying pin 4, and allows a current (arc discharge) to flow only momentarily, so a thin pin may be used. The voltage applying pin 4 and the ground pin 6 are surge absorber pins 21.
It is the second longest and becomes a thick pin for flowing a large amount of current, and in particular, the length of the ground pin 6 may be equal to or longer than that of the voltage applying pin 4. The signal pins 8 ... Are the shortest and thinnest pins. A surge absorber 24 is connected between the power source 2 and the surge absorber pin 21. Although the surge absorber 24 is composed of a series circuit of a resistor and a capacitor in this embodiment, it may have another structure.

On the other hand, the daughter board 10 has an electronic circuit 12
Is mounted, a voltage application socket 14 connected to the electronic circuit 12, a ground socket 16, and a plurality of signal sockets 18 are mounted, and a surge absorber socket 22 is further mounted. Each socket 14, 1
6, 18, ..., 22 may have equal strokes.

When the daughter board 10 is hot-plugged into the motherboard 1, first, the surge absorber pins 21 are connected to the surge absorber sockets 22, and the paths connecting the surge absorbers 24 mounted on the motherboard 1 are connected. Next, the ground pin 6 and the voltage application pin 4 are connected, and the arc discharge due to chattering that occurs at this time is absorbed by the surge absorber 24 connected in advance, and after the power is stably supplied to the electronic circuit 12, the signal is output. Pins 8 ... Are connected.

When the daughter board 10 is hot-plugged from the mother board 1, first, the signal pins 8 are brought into non-contact with each other before the power supply to the electronic circuit 12 becomes unstable, and the voltage pin 4 and the ground pin 6 are disconnected. The arc discharge generated when disconnected is absorbed by the surge absorber 24 mounted on the motherboard 1 that is connected to the end.

[0046]

As described above, according to the circuit board device of the first aspect, the arc discharge generated at the time of hot line insertion / extraction is suppressed by the arc discharge suppressing means and is propagated to other members. And the malfunction of the electronic circuit can be avoided.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a schematic configuration of a circuit board device according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a schematic configuration of a circuit board device according to a second embodiment of the present invention.

FIG. 3 is a conceptual diagram showing a schematic configuration of a circuit board device according to a third embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a schematic configuration of a circuit board device according to a fourth embodiment of the present invention.

FIG. 5 is an equivalent circuit model representing the time domain of the circuit board device of the present invention.

FIG. 6 is a back circuit model showing the frequency domain of the circuit board device of the present invention.

FIG. 7 is a conceptual diagram showing a schematic configuration of a conventional circuit board device.

FIG. 8 is an equivalent circuit model representing a time domain of a conventional circuit board device.

FIG. 9 is a back circuit model showing the frequency domain of the conventional circuit board device.

[Explanation of symbols]

 1 Motherboard 2, 2'Power Supply 4, 4a, 4b Voltage Application Pin 6, 6 'Ground Pin 8 Signal Pin 10 Daughter Board 12, 12', 12 "Electronic Circuit 14, 14a, 14b Voltage Application Socket 16, 16 'Ground Socket 18 Signal socket 21, 21a, 21b Surge absorber pin 22, 22a, 22b Surge absorber socket 24 Surge absorber

Claims (4)

[Claims] 1. A first contactor for power supply to an electronic circuit mounted on a daughterboard side on a motherboard side, and a first contactor for a signal.
And a contactor, respectively, and is inserted into the first contactor for the power source on the daughter board side.
A circuit board device comprising a second contactor for a power source that can be pulled out and a second contactor for a signal that can be inserted and pulled out in the first contactor for a signal. Arc discharge suppressing means for suppressing arc discharge generated during hot insertion or hot drawing of the first and second contacts, and either the motherboard side or the daughter board side connected to the arc discharge suppressing means A first contact for suppressing arc discharge mounted on one of them, and a second contact for suppressing arc discharge that can be inserted into and removed from the first contact and is mounted on the other of the motherboard side and the daughter board side. The first contactor and the second contactor for suppressing arc discharge contact each other before the other first and second contactors for power supply and signal when the hot wire is inserted. , Again The circuit board and wherein the constructed as contact until after the first and second contacts to each other of the other when the line sampling. 2. A first contactor for grounding is arranged on the mother board side, and a second contactor for grounding which can be inserted into and removed from the first contactor for grounding is arranged on the daughter board side. If the electronic circuit has a plurality of power supplies, the total length of the arc contact suppression first contact and the second contact is the first for the signal, respectively.・ The total length of the first contactor for grounding and the total length of the second contactors, which are set longer than the total length of the second contactors, are respectively set for the signals. When the total length of the first and second contactors is set to be longer than that of the first contactor and a single power source is provided for the electronic circuit, the first contactor for suppressing the arc discharge is provided. The total length, which is the sum of the length and the length of the second contactor, is the first and second contacts for other grounding and signals, respectively. The circuit board device according to claim 1, characterized in that it is longer than any of the total length obtained by adding the length of the. 3. The arc discharge suppressing means and the first and second contact elements for suppressing arc discharge are both arranged in the vicinity of the first and second contact elements for the power source, and the arc discharge is provided. The circuit board device according to claim 1, wherein the suppressing means is mounted on at least one of the motherboard side and the daughter board side. 4. A grounding first contactor is disposed on the motherboard side, and a grounding second contactor which can be inserted into and removed from the grounding first contactor is disposed on the daughter board side. At the same time, the grounding first contactor and the second contactor contact each other before the arc discharge suppressing first and second contactors when the hot wire is inserted, and when the hot wire is removed. The circuit board device according to claim 1, wherein the circuit board device is configured such that the first and second contactors for suppressing the arc discharge are set to be in contact with each other further than the first and second contactors.