JPS62150412A - Electronic equipment - Google Patents

Abstract

PURPOSE:To minimize the system damage by applying on/off control to each power supply unit taking the importance of a shelf of each unit into account based on the result of detection of temperature sensors of the same number of power units. CONSTITUTION:A case 1 of a private branch of digital exchange has plural shelves 2, a card-shaped electronic device is contained in each port, power supply units 3 are arranged at both ends and a fan unit 4 is provided on the case 1. The power supply units 3 are constituted to be turned on/off individually and a temperature sensor 6 detecting its internal temperature is provided and connected to a power supply control unit 7. In this case, the information of mounted position of the electronic devices and of the rank of their importance is stored in a ROM table 10 of the unit 7 and wen an abnormal temperature is detected by the plural power supply units 3, the temperature is referenced to decide the order of OFF of the power units 3. As a result, the system damage due to the power OFF is minimized.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides a digital private branch exchange that can be configured by stacking shelves each having a plurality of electronic devices and a common power supply unit in the same housing. The present invention relates to an electronic device having a building block structure such as the above, and particularly relates to a temperature control means for suppressing a rise in temperature within the housing in the event of a failure of a fan for forced air cooling.

(Prior Art) Generally, electronic devices that generate a large amount of heat are equipped with a fan for forced air cooling in order to prevent the device from malfunctioning due to heat generation. However, since the fan is a mechanical component, it is necessary to consider countermeasures in case it breaks down. As a countermeasure against this, for example, a temperature sensor is installed at an appropriate location within the equipment, and when the temperature detected by the temperature sensor exceeds a certain threshold, it is determined that the fan has stopped working, and the equipment There is a way to turn off the power. However, this method has the following problems.

In electronic devices such as telephone exchanges, e.g. digital private branch exchanges, the same shelf is installed in four layers, each having a card-shaped electronic device (circuit board) and a common power supply unit that supplies power to these electronic devices. A configuration in which the device is housed within a housing is often adopted. In electronic devices with this type of structure, when the fan stops due to a failure, etc., the location where the most heat is generated is not fixed, but varies depending on the combination of shelves, that is, in which tier each shelf is placed, and it also depends on the location within each shelf. It also depends on the placement of the electronic emitter.

Therefore, if an electronic device in a shelf located away from the location where the temperature sensor is installed generates heat when the fan fails, it cannot be detected and there is a risk that the device may be destroyed. This problem can be solved by providing temperature sensors throughout the device, but this requires installing an extremely large number of temperature sensors, which makes wiring and management complicated.

In addition, in such electronic devices, the functions of the electronic devices provided on each shelf generally differ, and their importance also differs. Therefore, it is important to immediately turn off the power of the entire device when the temperature detected by the temperature sensor exceeds the H value, even though the temperature near relatively important equipment is low. This is not preferable because it also causes the operation to stop. That is, there is a problem in that the system damage is large when the fan fails.

(Problems to be Solved by the Invention) As described above, with the conventional technology, it is difficult to reliably detect a shelf whose temperature has increased due to fan failure, and it is difficult to reliably detect a shelf whose temperature has increased due to a fan failure. There was a problem in that the system became inoperable and the system damage during m-degree control was large.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic device that can reliably detect a shelf where a temperature increase has occurred using a limited number of temperature detection means, and that can perform temperature control with little damage to the system.

[Configuration 1 of the Invention (Means for Solving the Problems) The present invention is configured by MIMing a shelf that is provided in the same housing and each has a plurality of electronic units and a common power supply unit that supplies power to these units. In an electronic device such as a digital private branch exchange with a so-called building block structure, 'r! Each of the power supply units is provided with a temperature detection means, and the power supply unit is controlled to be turned on or off based on the detection results of these temperature detection means, considering the importance of each shelf on which it is installed. be.

(Function) The temperature detected by the temperature detector E2 provided in each power supply unit corresponds to the power consumption of the electronic equipment in the same shelf to which the power supply unit supplies power. Since the amount of heat generated by a single electronic device depends on its power consumption, detecting 3 degrees Celsius of a power supply unit is equivalent to detecting the temperature of a card in the same shelf. By providing the temperature detection means in the power supply unit in this way, it is possible to monitor the temperatures of all cards in the device using a relatively small number of temperature detection means.

On the other hand, the power supply units are configured so that they can be individually controlled on and off, unlike in the past, and are controlled based on the detection result of the temperature detection means in relation to the importance of the shelf in which the power supply units are installed. The importance of a shelf is determined by the importance of the electronic devices within the shelf. For example, if abnormal temperatures exceeding the same value are detected in multiple power supply units continuously for a certain period of time, the power supply unit of the least important shelf will be turned off, and even after a certain period of time has elapsed, If there is still a power supply unit with an abnormal temperature, the power supply unit on the next least important shelf is turned off. Such temperature control minimizes the harm caused by turning off the power supply unit of a highly important shelf, that is, system damage. Note that the degree of importance can also be considered as the degree of priority.

(Embodiment) FIG. 1 is a schematic configuration diagram of a digital private branch exchange as an electronic device according to an embodiment of the present invention.

As shown in FIG. 1, the housing 1 has multiple stages (four stages in this example) of shelves 2a to 2e. these shelves 2
Each of a to 2e has a plurality of boats, and each boat houses a card-shaped electronic device (hereinafter referred to as a card) mounted on a board in a boat-free manner, that is, in a removable manner. The power supply unit 3 is arranged at the . Further, a fan unit 4 is arranged at the top of the housing 1.

Here, the shelves 2a to 2d are line 7' trunks (which are interfaces for various terminals such as telephones and various office lines).
The shelf 2e accommodates a common control till (CC) card that controls the entire device.

The power supply unit 3 has a plurality of output systems with different voltages and polarities, and supplies them to the cards in each of the shelves 2a to 2e. The reason why two sets of power supply units 3 are provided in each shelf 2a to 2e is that they are used in parallel.
This is to maintain the operation of the cards in the corresponding shelf even if one of the power supply units fails or malfunctions for some reason.

Since the power supply units 3 are configured to be individually on/off controllable, they each have control input terminals 5 for receiving external control signals. Further, the power supply unit 3 is further provided with a temperature sensor 6 such as a mister for detecting its internal temperature. The temperature sensor 6 is attached to a heat sink on which these Sonoji elements are supported, so as to detect the temperature of circuit elements such as transistors and diodes constituting the power supply circuit.

The υJID input terminal 5 and temperature sensor 6 of the power supply unit 3 are connected to a power supply control unit 7.

This power supply control unit 7 is configured as a specific card in the shelf 2e using, for example, a common 1iIJW CPU or a dedicated CPU in the CG shelf 2e that accommodates a common control card.

FIG. 2 shows the specific configuration of the power supply control unit 7. By comparing the signal from the temperature sensor 6 with a predetermined equivalent value in the determination circuit 8, the temperature of the power supply unit 3 exceeds a threshold value and is abnormal. It is determined whether the temperature has reached the temperature, and the determination result is sent to the on/off control circuit 9. The on/off control circuit 9 turns off the power supply units in order from the card mounting position and importance rank information written in the ROM table 10 when abnormal temperatures are detected in a plurality of power supply units 3. and supplies a control signal to the control input terminal 5 of the power supply unit 3 accordingly.

The "card mounting position" written in the ROM table 10 is information indicating the position of the shelf where the card of each function is accommodated, and the "importance rank" indicates the importance of each shelf 2a to 2e. In other words, it shows the importance of the cards in that shelf.

Note that the degree of importance can be evaluated from two viewpoints. The first is the functional evaluation of the components of the exchange. For example, the CC shelf 2e housing the common control unit has the highest importance, while the L/T shelves 2a to 2d housing line/trunk cards have the lowest importance.

The second evaluation of importance is that even if the basic functions of the cards are the same,
The evaluation changes depending on what kind of object it is connected to. For example, in the L/T shelves 2a to 2d that house line/trunk cards, the importance of cards connected to switchboards is higher than that of cards connected to general telephone terminals. In addition, even if a card is connected to a general telephone terminal, for example, a card connected to a terminal in the president's office in a company office is not as important as a card connected to a terminal for general employees. It can be said that it is higher in comparison. These situations may vary depending on the user.

Next, the operation of this embodiment will be explained with reference to the flowchart in FIG. First, in step 11, it is determined whether abnormal temperature has been detected in the ii source unit of one shelf. For example, in FIG. 1, if the temperature of the power supply unit 3 of the L/T shelf 2a above the claw exceeds the threshold and becomes abnormal, the important You can check the degree. As a result, when it is determined that the importance of the shelf 2a is lower than the standard, in other words, the importance of the cards stored in the shelf 2a is all lower than a certain standard, the on/off control circuit 9 switches the power supply of the shelf 2a. Turn unit 3 off (step 17).

Further, if it is determined in step 12 that the importance levels of all the cards housed in the shelf 2a are higher than the standard, the power supply unit 1-3 of the shelf 2a remains on,
Turn off the power supply units 3 of other less important shelves (for example, any of 2b to 2d) (step 13)
). Next, after a predetermined period of time has elapsed since the power supply unit of the less important shelf is turned off, it is expected that the power supply unit that has been turned off will cool down to a temperature such that its thermal effect on other shelves can be ignored. After the time has elapsed, the temperature of the power supply unit of the shelf is checked again (step 14). As a result, if it is determined that the temperature of the power supply unit is still abnormal, the process returns to step 13.

By performing such control, even if all the power supply units 3 of all the shelves 2C to 2d, which are less important than the shelf 2a, are turned off, the power supply unit 3 of the shelf 2a
If the temperature remains abnormal, this shelf 2
Turn off the power supply unit 3 of a (step 16.17
).

On the other hand, if it is determined in step 18 that abnormal temperature has been detected in 88 units of multiple shelves, the power supply of the shelf with the lowest importance among the power units of the multiple shelves where the abnormal temperature was detected Turn off the unit (step 19).

Then, after a predetermined period of time has passed since the power supply unit of the least important shelf is turned off, it is expected that the power supply unit that has been turned off will cool down to a temperature such that its thermal influence on other shelves can be ignored. After the elapse of time, the temperature of the power supply unit of the shelf is checked again (step 20). If it is determined that there is still a power supply unit with an abnormal temperature, the process returns to step 19 and the same control is performed.

Note that the present invention is not limited to the above embodiments,
For example, the procedure for controlling the power supply unit shown in FIG. 3 is merely an example, and can be modified in various ways. It is also useful to store information such as the location of the shelf where an abnormal temperature of the power supply unit was detected or the shelf where the power supply unit was turned off in the power supply control unit, and to display this information during inspection or repair. . In addition, the present invention can be implemented with various modifications without departing from the scope.

[Effects of the Invention] According to the present invention, each power supply unit 1 can be controlled on and off based on the temperature detection results of the same number of temperature sensors as the power supply unit, taking into consideration the importance of the shelf in which it is installed. This reduces the need to stop the operation of highly important electronic devices in the shelf, and it is possible to prevent the temperature of the device from rising in the event of a fan failure or the like while minimizing system damage.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a digital private branch exchange, which is an electronic device according to an embodiment of the present invention, FIG. 2 is a diagram showing the internal configuration of a power supply control unit in the embodiment, and FIG. It is a figure for explaining the procedure of on/off control when the temperature of the power supply units 1 to 1 rises. DESCRIPTION OF SYMBOLS 1... Housing, 2a-2e... Shelf, 3... Power supply unit, 4... Fan unit, 5... Control input terminal, 6... Temperature sensor, 7... Power supply control Unit, 8... Judgment circuit, 9... On/off control circuit,
10...ROM table.

Claims (2)

[Claims] (1) In an electronic device configured by stacking shelves each having a plurality of electronic devices and a common power supply unit that supplies power to these electronic devices, each of which is provided in the same housing, temperature detection provided in each of the power supply units is provided. and control means for controlling the power supply unit on and off based on the detection results of the temperature detection means, taking into consideration the importance of each of the shelves in which the power supply unit is installed. electronic equipment that (2) The control means controls to turn off the power supply units of the less important shelves when the temperature detected by the temperature detection means in the power supply units of one or more shelves exceeds a threshold value. An electronic device according to claim 1, characterized in that the electronic device is an electronic device.