JPH01253995A - How to insert live wires into an electronic circuit board - Google Patents

Abstract

PURPOSE:To prevent a rush current generated in the case of inserting a hot-wire by providing two types of long and short terminals of a connector for current supply, and energizing the long terminal to be engaged earlier through an electric resistor. CONSTITUTION:The lengths of connector terminals 4, 6 of an electronic circuit board 1 which are mounted on a main printed circuit board 2, connected through the board 2 and a connector 3 and supplied from a power source include two types of long and short ones. The long terminal 4 is connected to the power terminal 11 of the board 2, supplied through an electric resistor 5, a bypass capacitor 10 which may cause a rush current is charged to suppress the flow of a large current by the resistor 5, and then the short terminal 6 is connected to the terminal 12 of the board 2 to be normally supplied. Thus, a rush current at the time of inserting the hot-wire can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to electronic equipment, and in particular, when an electronic circuit board is inserted or removed while the electronic equipment is in operation, the influence on other circuits is minimized. The present invention relates to an electronic circuit board suitable for.

[Conventional technology]

A generally known method for inserting live wires was to control the connection order between power supply, ground wires, and general signals by changing the length of the connector on the electronic circuit board.

On the other hand, as described in Japanese Unexamined Patent Publication No. 188998/1983, a power supply connector is installed in addition to the connector with the main printed circuit board, and when inserting a live wire, connect the power supply connector to supply power to the electronic circuit board in advance. There was a method of inserting it into the main printed wiring board in the state that it was left in place, but as a means to prevent the rush current that occurs when the supply line is connected to
As described in Japanese Patent No. 00, a method of controlling the inrush 11t flow using a transistor or the like has been considered.

[Problem to be solved by the invention]

In recent years, as electronic circuit boards have become larger and more compactly integrated, the amount of bypass capacitors provided in electronic circuit boards for preventing power supply noise has tended to increase.

For this reason, simply controlling the connection order of the power supply, ground line, and signal line cannot follow the rapid fluctuations in the power supply caused by the rush current flowing into the bypass capacitor, resulting in noise. Furthermore, JP-A No. 61-188998 v
The method described in c requires complicated manual operations and cannot be used as a countermeasure against the rush current. Furthermore, JP-A-62-
The inrush current prevention method described in 76800VC not only complicates the circuit, but also requires a semiconductor element between the connector and the electronic circuit, which causes electronic drop and makes voltage setting complicated.
Particularly when a large number of similar electronic circuit boards are mounted on a main printed wiring board, there are problems such as variations in the vct pressure for each electronic circuit board due to the voltage drop.

It is an object of the present invention to provide an electronic circuit board for hot wire insertion which has a mechanism for eliminating these problems and preventing the inrush current caused by the insertion of a hot wire.

Means for Solving the C-Line Problem] The above purpose is to provide two types of long and short terminals for the connector that is mounted on the printed wiring board and supplies power to the printed wiring board through it, so that the connector can be connected quickly. This is achieved by a hot insertion method for electronic circuit boards in which long mating terminals supply power to the printed wiring board via electrical resistance, and time delays (short mating terminals continue to supply power as is).

[Effect]

In other words, the longer terminal is first connected to the IT terminal of the main printed wiring board, and this tVC, which supplies power through electrical resistance, charges the bypass capacitor that causes the inrush current. Prevents the dog from flowing. Thereafter, the short terminal is connected to the terminal of the main printed wiring board to carry out full-scale power supply, but since the VC bypass capacitor is already charged, no large current flows and inrush current can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

1 is an electronic 1i21'NI board according to the present invention. Reference numeral 2 denotes a main printed wiring board, which is a backboard on which the electronic circuit board 1 is mounted and operates. 5 is a connector for connecting the electronic circuit board 1 and the main printed wiring board 2.

Reference numeral 4 denotes a long terminal connected to the connector 5, and power is supplied from the terminal 4 to the internal circuit via the electrical resistor 5.

Reference numeral 6 denotes a terminal connected to the connector 5VC, which is shorter than terminal 4 by α. The terminal 6 is directly connected to the internal circuit.

8 is a terminal for connecting a grounding wire (GRD) and has the same length as terminal 4. 9 is an electronic circuit consisting of logic elements, etc., which receives power and GRD from terminals 4, 6, and B;
It operates by inputting and outputting signals.

Reference numeral 10 denotes a bypass capacitor whose purpose is to remove noise from the power supply supplied to the electronic circuit at 9Vc. 11°12
Terminal 4.6 is a terminal of the connector 5, which is a power supply terminal for supplying power to the IC, and is connected on the main printed wiring board 2, and outputs the same power supply tllIE.

Since the configuration is as described above, the following operation is performed when a hot line is inserted.

When the electronic circuit board 1 is inserted into the main printed wiring board 2, the - long terminal 4 comes into contact with the terminal 11vc, which supplies power to the electronic circuit 9 and charges the bypass capacitor 10 via the electrical resistor 5. At this time, the current is limited by the electric resistor 5 in degrees Celsius.

Next, when the electronic circuit board 1 is further pushed in, the terminal 6 will be connected to the terminal 1.
1 VC, but since the bypass capacitor IDK is already charged via terminal 4, a large inrush current can be prevented.

〔Effect of the invention〕

Because of the operation described above, the present invention has an extremely simple structure and can reduce the inrush current when a live wire is inserted, and does not require any circuitry in the power supply system during normal operation. Since the voltage applied to the terminal 6V'c is transmitted to the electronic circuit without dropping, it does not affect the electrical IEEEu constant.Therefore, it is possible to provide an electronic circuit board that can be inserted into a live wire, which is excellent in terms of temperature and economy.

[Brief explanation of the drawing]

FIG. 1 is a beak configuration diagram for explaining one embodiment of the present invention. 1...Electronic circuit board 2...Main printed wiring board 5...Connector 4...Long terminal 5...Electric resistor 6...Short terminal Fig. 1

Claims (1)

[Claims] 1. An electronic circuit mounted on a main printed wiring board, connected to the main printed wiring board via a connector, connected to signals and powered by the connector, and operated by mounting electronic components such as logic elements. In the board live wire insertion method, the length of the terminal of the connector is at least longer. Two types of short terminals are provided, and the mating time of the connector terminals is changed, and the long terminal that is mated quickly is connected to supply power to the electronic component through electrical resistance, and the other terminal is mated slowly. The electronic device is characterized in that the mating short terminals have two power supply circuits that are directly connected to supply power to the electronic components, thereby preventing disturbance to the power supply system of the main printed wiring board when a live wire is inserted. How to insert live wires into a circuit board.