JPH06348368A - Hot line insertion dealing circuit for electronic circuit device - Google Patents

Abstract

PURPOSE:To prevent the damage of a connector and the drop of the power voltage in a hot line insertion state of an electronic circuit board which consumes the large power. CONSTITUTION:An electronic circuit board 50 has a male connector 32 consisting of the 1st - 3rd pins 33-35 connected to a load circuit 31 at one of its both ends. A female connector 21 of a back board 20 to which a hot line of the connector 52 is inserted has the 1st - 3rd contacts 22-24 corresponding to the pins 33-35 respectively. The pins 55 end 35 have the same length, end the pin 34 has the smaller length than both pins 33 end 35. A power circuit board 10 which supplies the power to the connector 21 includes 8 constant voltage source 12 and a constant current source 11 which defines the voltage level of the source 12 as its upper limit level. Then the board 30 first receives the power from the source 11 in a hot line insertion state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit device,
In particular, the present invention relates to a hot-line insertion supporting circuit of an electronic circuit device in which an electronic circuit board is inserted while the power is on.

[0002]

2. Description of the Related Art Conventionally, in an electronic circuit device in which an electronic circuit board is inserted while the power is on, the electronic circuit board is mounted on the electronic circuit board in a transient state until the voltage value reaches a predetermined value. A phenomenon occurs in which current flows into a large number of bus capacitors that are installed. Therefore, a large current flows in the electronic circuit board as a temporary rush current. The rush current at this time causes a problem that the load instantaneously increases in the power supply circuit in the electronic circuit device, and the voltage value of the power supply circuit temporarily drops.

As a conventional example for solving this problem,
As described in Japanese Patent Application Laid-Open No. 3-171214, a plurality of long pins and short pins are set and used separately for a power supply terminal of a connector of an electronic circuit board or a backboard, and long terminals are set on the electronic circuit board. There is a power supply line to which a pin is connected, in which a choke coil and a diode for limiting the inrush current value are connected in parallel.

Similarly, as disclosed in Japanese Patent Application Laid-Open No. 1-253995, a plurality of long pins and short pins are properly set and set in a power supply terminal of an electronic circuit or a connector of a backboard, and an electronic circuit On some boards, there is one in which a resistor for limiting the inrush current value is connected to a power supply line to which the long pin is connected.

[0005]

SUMMARY OF THE INVENTION In the above-described conventional hot-line insertion supporting circuit for an electronic circuit device, when the power consumption of the electronic circuit board to be inserted is large, a plurality of long pins for inrush current are provisionally provided and dispersed. Even if the connector of the electronic circuit board and the connector of the backboard come into contact with each other due to the manufacturing variation of the long pin and the insertion angle of the electronic circuit board, a large-current rush current must always be present in one connector pin first. Since it flows in, there is a problem that the connector pin may be damaged. In particular, a connector for high-density mounting is designed with a small pin shape, so that the maximum permissible current value becomes small and the risk of damage increases.

When the power consumption of the electronic circuit board to be inserted is large, a large current flows. Therefore, a plurality of choke coils each having a large allowable current value for each electronic circuit board to be hot-plugged are provided according to the inrush current value. There is a problem that it has to be implemented. Even if an attempt is made to control the inrush current value by mounting the choke coil to solve this problem, there is also a problem in that the current value is largely different for each electronic circuit board, so that sufficient control cannot actually be performed.

The present invention has been made in view of the above problems, and corresponds to hot insertion of an electronic circuit device which prevents connector damage and power supply voltage drop when hot-inserting a high power consumption electronic circuit board. It is intended to provide a circuit.

[0008]

The present invention for achieving the above object comprises a load circuit and a male connector including at least first, second and third pins, which is connected to the load circuit. A plurality of electronic circuit boards provided and a plurality of female connectors including at least first, second, and third contacts corresponding to the first, second, and third pins into which the male connector is hot-inserted are provided. A backboard having the electronic circuit board mounted on the female connector and a power supply circuit board for supplying power to the electronic circuit board mounted on the backboard, and supplying power from the power supply circuit board through a male connector A hot-line insertion supporting circuit of an electronic circuit device for operating a load circuit of a plurality of electronic circuit boards according to claim 1, wherein the power supply circuit board has a constant voltage source and a voltage value having a power supply voltage value of the constant voltage source as an upper limit. Limited A current source, wherein one output terminal of the constant current source is connected to a first contact of a female connector of the backboard into which the first pin of the male connector is inserted; The positive terminal of the constant voltage source is connected to the second contact of the female connector into which the second pin is inserted, and the third contact of the female connector into which the third pin of the male connector is inserted is referred to above. The other terminal of the constant current source and the negative terminal of the constant voltage source are connected, and the first and second pins are formed to have the same length and longer than the third pin. And

[0009]

According to the present invention having the above-described structure, a plurality of electronic circuit boards in the electronic circuit device are already powered by the power supply circuit board and are operating, and the male connector of the electronic circuit board is live-wired to the female connector of the backboard. When inserting, first the first pin contacts the first contact and the third pin contacts the third contact. At this time, the downstream terminal of the constant current source of the power circuit board is connected to the first contact, and the upstream terminal of the constant current source is connected to the third contact, so that the electronic circuit board Current begins to flow in the load circuit and the voltage value gradually rises.

Then, when the electronic circuit board is gradually inserted into the female connector of the backboard, the second pin of the male connector starts to come into contact with the second contact of the female connector.

At this time, since the voltage of the electronic circuit board has already reached the output voltage value of the constant current source, the rush current from the constant voltage source of the power circuit board to the electronic circuit board becomes very small, and it has already been inserted. Almost no voltage drop occurs in the electronic circuit board.

Since the output voltage of the constant current source does not exceed the power supply voltage value of the constant voltage source, no current flows from the constant current source to the constant voltage source at the end of mating of all pins, and power is supplied by the constant voltage source. Is performed stably.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of a circuit for hot-line insertion of an electronic circuit device according to the present invention.

As shown in FIG. 1, the electronic circuit board 30 is
At least one of the first and first ends connected to the load circuit 31
It has a male connector 32 including second and third pins 33, 34, 35. The female connector 21 of the backboard 20 into which the male connector 32 is hot inserted is fitted to at least the first, second, and third pins 33, 34, and 35, respectively, and electrically connected to the first and first pins. 2, third contact 22,2
3,24. First pin 33 and third pin 35
Have the same length and are formed longer than the second pin 34. The power supply circuit board 10 that feeds power to the female connector 21 of the backboard 20 has a constant voltage source 12 and a constant current source 11 having a voltage value limitation whose upper limit is the power supply voltage value of the constant voltage source 12. The first contact 22 of the female connector 21 is connected to the first output terminal of the constant current source 11 of the power circuit board 10, and the second contact 23 of the constant voltage source 1 of the power circuit board 10.
The third contact 24 is connected to the positive terminal of 2 and the second output terminal of the constant current source 11 of the power circuit board 10 and the negative terminal of the constant voltage source 12.

FIG. 2 is a perspective view showing the configuration of an electronic circuit device for mounting the electronic circuit board 30 shown in FIG. 1 on the backboard 20 to operate it.

In the electronic circuit device of this embodiment, as shown in FIG. 2, a plurality of female connectors 21A, 21B, 21C of the backboard 20 are supplied with electric power from the power circuit board 10, respectively. 30C is for hot insertion.

In FIG. 2, the electronic circuit boards 30A and 30B mounted on the backboard 20 are in operation by power supply. At this time, the electronic circuit board 30C is attached to the female connector 21C which is supplied with power from the power circuit board 10. The operation in the case of hot insertion as shown by the arrow will be described below with reference to FIG.

FIG. 3 is a graph showing a voltage change in the electronic circuit board 30C when the electronic circuit board 30C shown in FIG. 2 is hot-inserted into the backboard 20.

As shown in FIG. 2, the male connector 32C of the electronic circuit board 30C, that is, the electronic circuit board 3 shown in FIG.
When the male connector 32 of No. 0 is hot-inserted into the female connector 21C of the backboard 20, that is, the female connector 21 shown in FIG. 1, first, the first pin 33 shown in FIG. The third pin 35 and the third contactor 24 start contacting each other. This time is time T0 shown in FIG. At this time, current starts to flow from the constant current source 11 to the load circuit of the electronic circuit board 30C, and as shown in FIG.
The voltage in 0C rises. Since the inrush current of the current value at this time is limited by the constant current source 11, a large current does not flow.

When the electronic circuit board 30C is gradually inserted into the female connector 21C of the backboard 20, the electronic circuit board 30C, that is, the second pin 34 of the electronic circuit board 30 shown in FIG. Starts to make contact with the second contact 23 of the female connector 21 of the backboard 20, which is time T1 shown in FIG.

At this time, the voltage in the electronic circuit board 30C has already reached a predetermined voltage value, and the members constituting the circuit are in a stable state.
The rush current to 0C becomes very small, and the voltage drop of the circuit of the already inserted electronic circuit boards 30A and 30B hardly occurs.

[0023]

As described above, according to the present invention, the constant current source is provided on the power supply circuit board, so that the inrush current when the electronic circuit board is attached to the backboard is a constant value which does not exceed the power supply voltage value. Can be set to. Therefore, even if the electronic circuit board consumes a large amount of power, there is no possibility of damaging the connector.

Further, since the constant current source and the constant voltage source are provided separately, the power supply voltage does not drop with respect to the circuit of the electronic circuit board other than the inserted one when the hot line is inserted.

Then, the trouble of controlling the current for each of the plurality of electronic circuits is eliminated.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an embodiment of a circuit for hot-line insertion of an electronic circuit device of the present invention.

FIG. 2 is a perspective view showing a configuration of an electronic circuit device for mounting the electronic circuit board shown in FIG. 1 on a backboard to operate the electronic circuit board.

FIG. 3 is a graph showing voltage changes in the electronic circuit board when the electronic circuit board shown in FIG. 2 is hot-inserted into a backboard.

[Explanation of symbols]

 10 Power Circuit Board 11 Constant Current Source 12 Constant Voltage Source 20 Backboard 21, 21A, 21B, 21C Female Connector 22 First Contact 23 Second Contact 24 Third Contact 30, 30A, 30B, 30C Electron Circuit board 31 Load circuit 32, 32A, 32B, 32C Female connector 33 First pin 34 Second pin 35 Third pin

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[Procedure amendment]

[Submission date] November 9, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

The present invention for achieving the above object comprises a load circuit and a male connector including at least first, second and third pins, which is connected to the load circuit. A plurality of electronic circuit boards provided and a plurality of female connectors including at least first, second, and third contacts corresponding to the first, second, and third pins into which the male connector is hot-inserted are provided. A backboard having the electronic circuit board mounted on the female connector and a power supply circuit board for supplying power to the electronic circuit board mounted on the backboard, and supplying power from the power supply circuit board through a male connector A hot-line insertion supporting circuit of an electronic circuit device for operating a load circuit of a plurality of electronic circuit boards according to claim 1, wherein the power supply circuit board has a constant voltage source and a voltage value having a power supply voltage value of the constant voltage source as an upper limit. Limited A current source, wherein one output terminal of the constant current source is connected to a first contact of a female connector of the backboard into which the first pin of the male connector is inserted; The positive terminal of the constant voltage source is connected to the second contact of the female connector into which the second pin is inserted, and the third contact of the female connector into which the third pin of the male connector is inserted is referred to above. The other terminal of the constant current source and the negative terminal of the constant voltage source are connected, and the first and third pins have the same length and are formed longer than the second pin. And Also,
The second pin is connected to the second contactor in the electronic circuit board.
After reaching the output voltage value of the constant current source,
And are characterized.

Claims (1)

[Claims] 1. A load circuit and connected to the load circuit,
A plurality of electronic circuit boards including at least a male connector including first, second, and third pins, and at least a first pin corresponding to the first, second, and third pins for hot insertion of the male connector , A backboard in which a plurality of female connectors including second and third contacts are provided, and the electronic circuit board is mounted on the female connectors, and for supplying power to the electronic circuit board mounted on the backboard A hot-plugging compatible circuit of an electronic circuit device, comprising a power supply circuit board, and operating load circuits of a plurality of electronic circuit boards by supplying power from the power supply circuit board through a male connector, wherein the power supply circuit board is a fixed circuit board. A voltage source and a constant current source with a voltage value limit having a power supply voltage value of the constant voltage source as an upper limit, wherein the female connector of the backboard into which the first pin of the male connector is inserted First One of the output terminals of the constant current source is connected to the contact, and the positive terminal of the constant voltage source is connected to the second contact of the female connector into which the second pin of the male connector is inserted. The other terminal of the constant current source and the negative terminal of the constant voltage source are connected to the third contact of the female connector into which the third pin of the connector is inserted, and the first and second pins are the same. The length of the third
A hot-plugging compatible circuit for an electronic circuit device, characterized in that it is formed longer than the pin.