JPS63298511A - Power unit - Google Patents

Abstract

PURPOSE:To easily realize a maintenance operation by separately providing a power supply control circuit from an electronic circuit on a printed board. CONSTITUTION:When a power source disconnecting switch 14-1 is set to the position of the disconnection of a power source, a power source disconnecting signal is transmitted of a power circuit 16-1. The power lowers the level of a power source definition signal 21 from '1' to '0'. Accordingly, since an external interface circuit on the printed board 13-1 is reset, the electronic circuit on the printed board 13-1 is electrically separated from an electronic device unit 11 and the level of an output voltage signal 22 outputted from the power circuit 16-1 is lowered from '1' to '0'. Accordingly, the power circuit 16-1 stops the supply of a power to the electronic circuit on the printed board 13-1. In such a way, when a signal cable 17 is connected, the printed board 13-1 can be removed from the electronic device unit 11 to change to the printed board 13 of good quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply device used as a power source for, for example, a computer or an electronic exchange.

[Conventional technology]

There is a strong demand for maintenance, inspection, or replacement of parts of electronic devices such as computers or electronic switching equipment while these devices are in operation. By the way, an electronic exchange is composed of a communication path section and a control section, which are made of magnetic parts. However, recently these have been digitized,
Electronic circuits are increasingly being used. Electronic circuits used in electronic exchanges are constructed on printed circuit boards, and are connected to motherboards installed in electronic equipment racks of the electronic exchange.

Generally, an electronic exchange is equipped with a common power supply circuit for supplying power to each of a plurality of printed circuit boards. When the electronic exchange is operating, the electronic circuit may stop due to program malfunction, or the IC in the electronic circuit may
(integrated circuit) may be damaged. In this case, even if some of the electronic circuits fail, the defective printed circuit board can be replaced with a good one without interrupting the operation of the electronic exchange.

A connector is attached to the motherboard as a circuit connection means for connecting a printed circuit board. This includes a pin for supplying a signal of a path line connecting the communication path unit and the control unit, a pin for supplying power, and a pin for supplying an internal control signal of the electronic circuit. The length of the pins is set such that the pin that supplies the pass line signal is the shortest, the pin that supplies the internal control signal of the electronic circuit is the longest, and the pin that supplies the power is set to an intermediate length between the two. Therefore, when starting to unplug the connector, the pin that supplies the signal of the pass line is disconnected first, so that it is possible to prevent the adverse effects of noise on other electronic circuits.

Furthermore, since the structure is such that the pins that supply power are removed earlier than the pins that supply internal control signals of the electronic circuit, there is no danger of the electronic circuit being destroyed.

[Problem that the invention seeks to solve]

However, such a connector has a complicated structure, and it is difficult for general maintenance personnel to insert and remove the connector.

For this reason, the work of inserting and removing printed circuit boards during online repair cannot be performed smoothly, and chattering may occur, which may interfere with the operation of electronic circuits on other printed circuit boards. Furthermore, if the speed of insertion and removal of printed circuit boards is not constant, there is a risk that electronic circuits on other printed circuit boards that are in operation may be stopped.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power supply device that can be used to insert and remove a printed circuit board without having to consider handling when inserting and removing the printed circuit board.

[Means for solving problems]

The present invention provides (i) an electronic device rack, (ii) circuit connection means arranged for each system on the electronic device rack, and (iii)
) A power supply control circuit that is detachably attached to each circuit connection means for each system, and includes an electronic circuit, a power cutoff switch that instructs to turn off the power to this electronic circuit, and a power supply control circuit that controls the supply of power to this electronic circuit. and (iv) a printed circuit board prepared for each system and supplying power to the printed circuit board of that system,
When the power cutoff switch in that system instructs to connect the power, the power supply control circuit outputs a signal to supply power to the electronic circuit, and when the power cutoff switch instructs to cut off the power, this power supply control circuit outputs a signal to supply power to the electronic circuit. A power supply circuit that outputs a signal that cuts off the power supply from the circuit to the electronic circuit, (
and v) in the power supply device.

In the present invention, since the power supply is made independent for each electronic circuit, it is possible to insert and remove the printed circuit board without impairing the function of the electronic circuit during operation or adversely affecting the function of the electronic circuits on other printed circuit boards. Become.

〔Example〕

The present invention will be described in detail with reference to Examples below.

FIG. 1 shows an online repair type power supply device according to an embodiment of the present invention. A motherboard 12 is attached to the back side of the electronic device rack 11. On the motherboard 12, n connectors are arranged in parallel at predetermined intervals, and one ends of n printed circuit boards are respectively attached to these connectors in one-to-one correspondence.

These printed circuit boards 13-113-2...13
Near the other end of the switch 14-n, corresponding power cutoff switches 14-1, 14-2, .

The remaining portion of the board surface of each printed circuit board includes a power supply control circuit (hereinafter referred to as an external interface circuit).

) on the right, and the original circuit part of the electronic exchange (hereinafter referred to as the electronic circuit) is located. The power supply rack 15 has n power supply circuits 16-1, 16-2 corresponding to each other.
...16-n is stored. Printed circuit board 13
A signal cable 17-1 and a power cable are connected between the corresponding electronic circuits and the power supply circuits 14-1 and 14-1 for each system. 18-1... are connected.

Next, a procedure for replacing the printed circuit board 13-1 will be described in the case where the electronic circuit on the printed circuit board 13-1 stops.

The operator sets the power cutoff switch 14-1 attached to the printed circuit board 13-1 of the electronic device rack 11 to the power cutoff position. This power cutoff switch 14-1 is generally a toggle switch.

At time t1 in FIG.
1 is set to the power-off position, the power-off signal passes through the signal cable 17-1 to the power supply circuit 16-1.
sent to. The power supply circuit 16-1 receives this power cutoff signal and causes the level of the power confirmation signal 21 (FIG. 2a) to fall from "1" to "0" as shown by the signal 21-1.

As a result, the external interface circuit (not shown) on the printed circuit board 13-1 is placed in a reset state. Therefore,
The electronic circuit on the printed circuit board 13-1 is electrically disconnected from the electronic device rack 11. Power confirmation signal 21
After falling, the level of the output voltage signal 22 (FIG. 2b) of the power supply voltage output by the power supply circuit 16-1 falls from "1" to "0". As a result, power supply circuit 16-1
stops the power supply to the electronic circuit on the printed circuit board 13-1. In this way, the printed circuit board 13-1 can be removed from the electronic device rack 11 and replaced with a good printed circuit board 13 while the signal cable 17 remains connected.

A separate power supply (not shown) for controlling an external interface circuit is connected to the printed circuit board 13-1. Since this separate power supply is used only to drive the external interface circuit, the current that flows when replacing the printed circuit board 13-1 is very small.

Therefore, not only the electronic circuit of the printed circuit board 13-1 itself but also other printed circuit boards 13-2...13-
It has no effect on the electronic circuit of n.

When a non-defective printed circuit board 13 is installed in the electronic device rack 11 and the power cut-off switch 14-1 is turned to the power-on side, a power-on signal is output from the external interface circuit on the printed circuit board 13 by the aforementioned separate power supply. , are sent to the power supply circuit 16-1 through the signal cable 17-1.

As a result, at time t2 in FIG. 2, the level of the output voltage signal 22 (FIG. 2 b) of the power supply voltage output from the power supply circuit 16-1 rises from "0" to "1", and the power supply enters the output state. Become. After a predetermined time after the output voltage signal 22 of the power supply voltage rises, the level of the power supply confirmation signal 21 (FIG. 2a) falls from "ON" to "1".

This releases the reset state of the external interface circuit of the replaced printed circuit board 13-1, allowing the printed circuit board 13-1 to be used.

〔Effect of the invention〕

As described above, by providing a power supply control circuit separately from the electronic circuit on the printed circuit board, it is possible to instruct the electronic circuit to supply or cut off power using a signal. Therefore, when a maintenance person performs replacement work, it is possible to prevent chuckling from occurring, and furthermore, the trouble of removing a connector with a complicated terminal structure can be saved, and maintenance work can be performed easily.

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the present invention. Among them, Fig. 1 is a schematic configuration diagram of an online repair type power supply device, and Fig. 2 shows the timing of the power confirmation signal and the output voltage signal of the power supply voltage. FIG. 11...Electronic device rack, 13...Electronic circuit, 14...Power cut-off switch, 16...
...Power circuit. Applicant: NEC Corporation Agent
Patent Attorney Umeo Yamauchi Figure 1 Figure 2

Claims (1)

[Scope of Claims] An electronic device rack; circuit connection means arranged for each system on the electronic device rack; an electronic circuit detachably attached to each of the circuit connection means for each system; A printed circuit board with a power cut-off switch that instructs to turn off the power to the electronic circuit, and a power supply control circuit that controls the supply of power to the electronic circuit, respectively, are arranged on the board, and a printed circuit board prepared for each of the above-mentioned systems, While supplying power to the board, when the power cut-off switch of the system instructs to connect the power supply, outputting a signal that causes the power supply control circuit to supply power to the electronic circuit;
A power supply device comprising: a power supply circuit that outputs a signal that causes the power supply control circuit to cut off the power supply to the electronic circuit when the power cutoff switch instructs to cut off the power supply.