JPS58127224A - Power bus coupling construction - Google Patents

Abstract

PURPOSE:To protect a power bus and a circuit operated at low voltages, by connecting an overcurrent protecting means between the power bus and each card, and also connecting said means in parallel with a circuit operated at low voltage. CONSTITUTION:A current limiting means 602 is connected between cards 101a- 101n and the power bus 302. Even if a fault due to short-circuit relating to the common potential takes place in the cards 101a-101n, the overcurrent flows due to the short-circuiting, the means 602 is activated to interrupt the overcurrent and the failed part is disconnected from the bus 302 to protect the bus 302. Then, the effect to be exerted on other parts is blocked. Further, if a high voltage line 502 and a low voltage line 503 are contacted, a voltage limit means 604 is activated, allowing to prevent a voltage over the limit voltage of the circuit 603 of a low voltage from being fed to the circuit 603. Thus, the reliability of the bus 302 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention is directed to a14 used for example for process control.
Electronic ml like yurichu! This paper aims to propose a power path coupling structure in which a failure of one unit does not spread to other units, and therefore provides a highly reliable bower node. Ruru.

<6 Background> In general, as shown in FIG. 1, as a configuration method for electronic devices, the KIgl paths for each function or control system are stored on a single printed sheet, and the printed board unit 101 is mounted on a backboard. Normally, the devices 101 are attached to a wiring board 102 (called a rattan) via a connector 103, connected to each other via a backboard 102, and housed in a housing 201 as shown in the figure. This configuration method is called a multi-card system and is widely used. Therefore, below, the unit 101 will be referred to as a card.

Broadly speaking, multi-card electronic equipment can be divided into those such as computers, where if one card fails, the entire equipment will stop functioning, and those such as process control equipment, where each card is highly independent. When a single card malfunctions, only the control system that is in charge of that card may stop functioning.

This invention is aimed at the latter type of electronic device, and proposes a power path coupling structure in which a failure of one card does not affect other cards.

Description of Power Bus> When a multi-card system is adopted, power is supplied to each card 101a to 101n via a power supply block 301 and a power path 302, as shown in FIG.

For example, if card 1011 malfunctions, other card 101
Card 101 when it does not affect the operation of b to 101n.
Muranae can maintain the operation of the process by removing * a and replacing it with a normal crystal. In this case, Chokameito block 3
In order to maintain the operation of the process even in the event of a breakdown of
, 301b, parallel attM is sufficient. 401 shown in FIG. 4 indicates a power receiving terminal. This power receiving terminal 401 is provided, for example, on the back side of the unit 201 shown in FIG. 2.

The electric wire blocks 301 and 301b receive the same voltage, va, and vb through two power supply lines 501& and 501b, as shown in FIG. 5, for example, and the output lines 502.50
Mutual KJ at 3.504! It outputs voltages vm, vm, and Vs. Furthermore, the output shaft of the output lll1!505a alarm signal P,
b06 is a common potential line. These outputs #502-50
6 constitutes the power path 302 shown in FIG. A card 101 that is connected to this power path 302
m, 101b, ***5lQln as shown in Figure 4.
l! will be combined.

If a short-circuit accident with respect to the common potential occurs in the cards 101a to 101n, the power path 302 will lose its function even if the power supply system pulls are duplicated as shown in FIG. It affects the whole. Also power pass 30
2. In a situation where different voltages are supplied to the cards 101 & -101nK, if a lower voltage power supply line comes into contact with a lower voltage power supply line, and 9, all cards 101m-10
If the voltage is set within 1n, there is a risk of damage to circuits that operate at low voltages.

<Object of the Invention> This invention is applicable even when a short circuit accident occurs in a card where a power line comes into contact with a common potential.
□Provides a power path coupling structure that protects the power path 302 even if it comes into contact with other components and does not affect other components.

<41 spent on invention> Power pass 30 for ζO invention! An overcurrent protection means such as a fuse or a no-fuse breaker is connected between each card and each card, and an overvoltage protection means is connected at least in parallel with a circuit that operates at a low voltage to prevent any failure within the card. Even if a cross-contact accident occurs outside the important card, the power path 302 and the circuits that operate at low voltage can be protected.

<Configuration of the Invention> FIG. 6 shows an embodiment of the invention. 5oiat301
b indicates a power supply system block, a power supply system booter 301a;
Output III of 301b! 02. SO8 and common potential 95
06 are commonly connected to each other and derived as a power path 302. In this example, power supply II! Receives 24 volt DC voltage from 501& and 501b and outputs @502 and common [5
06rtlJK24dtk 0 DC voltage is output, and a 5 volt DC voltage is output between the output *SOS and the common potential @SO. Reference numeral 601 indicates a voltage regieleno for stepping down a voltage of 24 volts to a voltage of 5 volts.

In this invention, the power node 302 and each card 10
A current limiting means 602 is connected between the cards 1a to 101n, and a voltage limiter R604 is connected in parallel with the low voltage circuit 603 provided in each card 101a to 101n. For example, a TTF fuse or a no-fuse breaker can be used as the current limiter R602. The voltage limit check 604 can use a Zener diode or a relay contact that creates an overvoltage and turns off.

A specific example is shown in FIG. In the example shown in Figure wiJ7, a fuse is used as the current limiting means 602, and the voltage limiting device 60
4 shows the case where a zenata' diode is used.

<Operation and Effect of the Invention> - In this way, each card 101a to 101m)
Even if a short circuit to the common potential occurs in the p cards 101a to 101n by connecting the current limiting means 602 between the terminals 302, if an overcurrent flows due to the short circuit, the current limiting means 602 will respond. At the same time as disconnecting the current, the faulty part is disconnected from the bus 302 to protect the power bus 3o8. Therefore, each card 101
A short-circuit accident in the power supply line occurs within 101 m of a to 101m, and the 9th card malfunctions, and the 9th card is dynamically disconnected from the power bus jO2, preventing the impact on others.

On the other hand, 9502 on the high pressure side and 40 on the low pressure side! If 503 is in contact, KFi voltage limiting means 04 responds and limits the voltage of circuit 603, which operates at low voltage! 0 voltage above E is circuit 60
To prevent it from being given to 3. Therefore, even if such a cross-contact accident occurs, the reliability of the power path 302 can be improved by maintaining the circuit 603 that operates at low voltage.

Note that current limiting means 602 and voltage limiting means 9604 are also provided in the power supply ports 301m and 30ib.

0 current limiting means 6 in power supply system block 301m, 30ib
02 is the card and the bus 3
Similarly to 2, a fuse or no fuse breaker that turns off when it detects a 5fk overcurrent such as a short circuit current can be used. Specifically, as shown in FIG. 7, a fuse is used, which turns off in response to an overcurrent and maintains the power supply connected to the power supplies 501m and 501b. The voltage limiting means 604 provided in the power supply system blocks 301 and 301bK limits the voltage of the output pin 503 from rising above the specified value due to a failure of the voltage regulator 601, and limits the overvoltage that enters from the bus 302@. This protects the voltage regulator 601 and the circuit 603 that operates at low voltage within the card.

In addition, there is a power supply edge 5 in the power supply system blocks 301m and 301b.
A series protection means 605 is connected in series with 01 m, 50 lb and the output @503. Jin's serial hold hands *60
5Fi, for example, a diode can be used as shown in FIG. 7, and is provided to prevent a failure in either the power supply 9501a or the Fi 501b from spreading to the other power supply system. Further, a series protection means 605 connected in series with the output edge 503 operates to prevent the voltage drop from being output to the bus 302 when the output voltage of the oscillator 601 drops abnormally due to a failure of the voltage regulator 601, for example.

As described above, according to the present invention, in an electronic device that operates by being divided into O cards, the power path 302 can be maintained even if a short circuit occurs within the card.

The nine high voltage and low voltage electricity! Even if 1502.503 comes into contact, the enclosure 603, which operates at low voltage, can be destroyed, and a highly reliable electronic device can be provided.

4, )-11jil CO*+ 4L Explanation Figure 1 is a perspective view to explain the structure of a multi-card electronic device, Figure 2 is a perspective view showing the external appearance of the electronic device, Figure @3 and JlJ The figure is a block diagram for explaining the power bus of a multi-card type electronic power supply device, FIG. 7 are connection diagrams showing a concrete implementation of the present invention.

101 a to 101 n: Card, 102: Bank plate, 103: Connector, 201: Housing, 302: Power bus, 301m, 301b: Power supply system block, 6
01: % pressure regulator, 602: Current 11III limit'
=F-whale, 603: Circuit that operates at low voltage, 604: Voltage limiting means, 605: Series bonding agent Taku Single Needle, Applicant Hokushin Electric Works Co., Ltd.

Claims (1)

[Claims] (1) A co-contributor unit with multiple circuits that operate at different voltages, a power path that supplies these multiple units with the different voltages required by the bamboo units, and a power I (9 current limiting means inserted in 11 rows between the above-mentioned units and 9' voltage limiting means connected in parallel to at least the low voltage operating circuit of each unit).