KR100577135B1 - Apparatus for generating bad contactor at connectors - Google Patents

Abstract

The present disclosure relates to a device for generating a contact failure of a terminal, and easily reproduces a change in contact resistance due to a contact failure of each input / output connection terminal of an electronic control board, and thus, various malfunctions of the electronic control board based on the change in the contact resistance value. Quickly analyze the data and easily remove the cause of the malfunction according to the analyzed result.

Therefore, the present invention can enhance the reliability of the electronic control board, and provides an effect that can significantly reduce the maintenance period and cost.

Electronic Control Board, Poor Contact, Multi Turn Variable Resistor, High Speed Analog Switch, Magnetic Relay

Description

Apparatus for generating bad contactor at connectors}

1 is a circuit diagram showing an embodiment using an analog switch of the contact failure generating device of the terminal according to the present invention,

Figure 2 is a circuit diagram showing an embodiment using a magnetic relay of the contact failure generating device of the terminal according to the present invention,

3 is a detailed circuit diagram of an excitation coil driving circuit of FIG.

4 and 5 are diagrams showing an experimental waveform of the contact failure generating device of the terminal according to the present invention.

Explanation of symbols on the main parts of the drawings

11: high speed analog switch

12, 23: multi-turn variable resistor

13, 24: Dip Switch

14, 25: terminal for variable resistance measurement

21: magnetic relay

21a: Female coil

22; Excitation coil drive circuit

The present invention relates to an apparatus for generating a contact failure of a terminal.

More particularly, the present invention relates to a contact failure generating device of a terminal which enables to easily reproduce the change in the contact resistance value due to the contact failure of each input / output connection terminal of the electronic control board.

In general, a malfunction of the electronic control board may occur due to various causes such as noise caused by electromagnetic waves, component defects, poor contact between the input and output terminals, and among these causes, malfunction of the electronic control board occurs frequently. have.

For example, when contact failure due to impurities such as dust of the terminal occurs, the contact resistance of the terminal increases, and the contact resistance value changes considerably according to the contact failure state of the terminal.

Then, malfunctions of the electronic control board appear in various ways according to the change of the contact resistance. In the related art, since there was no equipment for analyzing the malfunction of the electronic control board due to the contact failure, as described above, When a malfunction occurs by the cause, it was very difficult to find and remove the cause, and this caused a problem that the reliability of the electronic control board was lowered and the maintenance period and the cost were greatly increased.

In addition, the conventional method has been limited to the technology for minimizing the contact resistance as a solution related to the contact failure of the electronic control board, there was a limit in finding the cause of the malfunction of the electronic control board due to the contact failure.

An object of the present invention is to easily reproduce the change of the contact resistance value due to the contact failure of each input and output connection terminal of the electronic control board, so that the various problems of the operation of the electronic control board based on the change of the contact resistance value It is to provide a contact failure generating device of the terminal that can quickly analyze the, and can easily eliminate the cause of the malfunction according to the analysis results.

The apparatus for generating a contact failure of a terminal according to the present invention for achieving the above object is composed of two input terminals and one output terminal for outputting a normal signal and a contact failure signal, and having a 1 or 0 state input from the outside. A high speed analog switch which performs a switching operation for outputting a normal signal or a defective contact signal to the electronic control board according to the control signal; A multi-turn variable resistor connected to one input terminal for outputting a bad contact signal of a high-speed analog switch, and continuously changing contact resistance by adjusting a variable resistance value to observe an operation state of the electronic control board; It is connected between two input terminals of high-speed analog switch.In the off state, the multiturn variable resistor is separated from the external circuit to measure the variable resistance value of the multiturn variable resistor.In the on state, the multiturn variable resistor is connected to the external circuit. And a dip switch connected to the output signal through the multi-turn variable resistor to output to the output terminal. When the dip switch is in the off state, the multi-turn is configured to include a variable resistance measurement terminal for adjusting the variable resistance value to the desired contact resistance value while measuring the variable resistance value of the variable resistor.

In addition, the contact failure generating device of the terminal according to the present invention, in order to reproduce the contact failure of the differential signal, high current or high voltage signal, two input terminals and one output terminal for the normal signal output, the contact bad signal output, and the excitation A magnetic relay comprising a coil and performing a relay operation for outputting a normal signal or a defective contact signal to the electronic control board depending on whether the excitation coil is excited by a current input from the outside; An excitation coil drive circuit for outputting a current for controlling the relay operation of the magnetic relay to an excitation coil of the magnetic relay according to a control signal of a 1 or 0 state input from the outside; A multi-turn variable resistor connected to one input terminal for outputting a bad contact signal of the magnetic relay, and continuously changing the contact resistance by adjusting the variable resistance value so as to observe an operation state of the electronic control board; It is connected between the two input terminals of the magnetic relay.In the off state, the multiturn variable resistor is separated from the external circuit to measure the variable resistor value of the multiturn variable resistor.In the on state, the multiturn variable resistor is connected to the external circuit. A dip switch connected to the contact failure signal to be output to an output terminal through a multiturn variable resistor; Another aspect of the present invention is configured to include a variable resistance measurement terminal for adjusting the variable resistance value to a desired contact resistance value while measuring the variable resistance value of the multi-turn variable resistor when the dip switch is in an off state.

Hereinafter, with reference to the accompanying drawings will be described in detail the contact failure generating device of the terminal of the present invention.

First, in order to reproduce the various contact resistances of the contact failure situation of each input / output connection terminal of the electronic control board, a wide range of contact resistances must be made, and the switch can be switched together with a switch that can select a normal signal and a bad contact signal. A control signal is needed.

In the present invention, a multi-turn variable resistor having a size of 1 MΩ is used to reproduce a wide range of contact resistance, and a high speed analog switch is used to easily switch from a normal signal to a bad contact signal or vice versa using a control signal.

When the input / output signal is a signal sensitive to noise, it is used as a differential signal resistant to common mode noise, that is, a difference signal between two terminals (+ and-). However, since the differential signal does not use a ground line, the above-described analog switch using a common ground cannot be used. Also, if the signal voltage or current is higher than the maximum voltage or current of the analog switch, the analog switch cannot be used. In order to reproduce the contact failure of the differential signal, the high current or the high voltage signal, a magnetic relay is used instead of an analog switch. The current of the excitation coil of the relay is controlled to select a normal signal or a bad contact signal, that is, one of the two signals. .

1 is a circuit diagram showing an embodiment using an analog switch of the contact failure generating device of the terminal according to the present invention as described above.

As shown, the high-speed analog switch 11 is composed of two input terminals (SA, SB) and one output terminal (D) for the normal signal output, contact failure signal output, 1 ( A switching operation is performed to output a normal signal or a bad contact signal to the electronic control board according to a control signal of + 5V) or 0 (0V).

That is, when the control signal is 1 (+ 5V), the upper input terminal SA is connected to the output terminal D (Fig. 1A), and when the control signal is 0 (0V), the lower input terminal SB is connected to the output terminal D. Connected (FIG. 1B).

The multi-turn variable resistor 12 is connected to one input terminal SB for outputting a bad contact signal of the high-speed analog switch 11, and continuously changes the contact resistance by adjusting the variable resistance value to operate the electronic control board. Observe the state.

In this case, the multi-turn variable resistor 12 described above is described by using a 10-turn variable resistor having a capacity of 1 MΩ, and the same applies to FIG. 2 described later.

The dip switch 13 is connected between two input terminals SA and SB of the high speed analog switch 11, and in the off state, the dip switch 13 is used to measure the variable resistance value of the multi-turn variable resistor 12. The turn variable resistor 12 is separated from the external circuit, and in the on state, the multi turn variable resistor 12 is connected to the external circuit so that a contact failure signal is output to the output terminal D through the multi turn variable resistor 12. do.

The variable resistance measuring terminal 14 adjusts the variable resistance value to a desired contact resistance value while measuring the variable resistance value of the multi-turn variable resistor 12 when the dip switch 13 is in an off state.

Figure 2 is a circuit diagram showing an embodiment using a magnetic relay of the contact failure generating device of the terminal according to the present invention.

As shown, the magnetic relay 21 has two input terminals (A, B) and one output terminal (A, B) for the normal signal output, the contact bad signal output to reproduce the contact failure of the differential signal, high current or high voltage signal ( C) and an excitation coil 21a, for outputting a normal signal or a defective contact signal to the electronic control board depending on whether the excitation coil 21a is excited by a current input from the excitation coil driving circuit 22. Perform relay operation.

That is, when the control signal 1 (+ 5V) is input to the excitation coil drive circuit 22, the excitation coil drive circuit 22 is driven to supply the current to the excitation coil 21a, whereby the excitation coil 21a is excited. When the input terminal A is connected to the output terminal C (FIG. 2A), when the control signal 0 (0V) is input to the excitation coil driving circuit 22, the excitation coil driving circuit 22 is opened so that the current is excitation coil 21a. The excitation coil 21a is not driven accordingly, so that the input terminal B is connected to the output terminal C (FIG. 2B).

The excitation coil drive circuit 22 outputs a current for controlling the relay operation of the magnetic relay 21 to the excitation coil 21a of the magnetic relay 21 according to a control signal of a 1 or 0 state input from the outside.

The multi-turn variable resistor 23 is connected to one input terminal B for outputting a bad contact signal of the magnetic relay 21, and the contact resistance is continuously changed by adjusting the variable resistance value, thereby operating the electronic control board. Observe that.

The dip switch 24 is connected between two input terminals A and B of the magnetic relay 21. In the off state, the dip switch 24 is used to measure the variable resistance value of the multi turn variable resistor 23. 23) is separated from the external circuit, and in the on state, the multi-turn variable resistor 23 is connected to the external circuit so that the contact failure signal is output to the output terminal C through the multi-turn variable resistor 23.

The variable resistance measuring terminal 25 adjusts the variable resistance value to a desired contact resistance value while measuring the variable resistance value of the multi-turn variable resistor 23 when the dip switch 24 is in an off state.

FIG. 3 is a detailed circuit diagram of the excitation coil driving circuit 22 of FIG. 2 and is connected to or opened in accordance with a control signal in a state of 1 or 0 input from the outside, and is applied to the excitation coil 21a of the magnetic relay 21. Excitation coil driving transistor (Q) for supplying or interrupting the current, and diode (D) for preventing the generation of spikes by refluxing the current flowing in the excitation coil (21a) when the excitation coil driving transistor (Q) is off. .

That is, when the control signal 1 (+ 5V) is input, the excitation coil driving circuit 22 conducts the excitation coil driving transistor Q to supply current to the excitation coil 21a, and the control signal 0 (0V) is input. When the excitation coil driving transistor Q is opened, a current is not supplied to the excitation coil 21a to perform a relay operation depending on whether the excitation coil 21a is excited.

Next, the operation of the contact failure generating device of the terminal according to the present invention configured as described above will be described in more detail with reference to the accompanying drawings.

First, an operation process of FIG. 1 showing a contact failure generating device of a terminal using an analog switch will be described in detail.

1A is a circuit diagram illustrating an operation state of a contact failure generating device when a normal signal is output. When control signal 1 (+ 5V) is input, the input terminal SA and the output terminal D of the high-speed analog switch 11 are connected to each other. The normal signal, which is inputted to, is output to the electronic control board through the output terminal D.

1B is a circuit diagram illustrating an operation state of a contact failure generating device for generating a contact failure in an input signal. First, the dip switch 13 is adjusted to an off state to separate the multiturn variable resistor 12 from an external circuit. The variable resistance value is adjusted to the desired contact resistance value while the variable resistance value is measured by the variable resistance measurement terminal 14.

Thereafter, the dip switch 13 is turned on to connect the multi-turn variable resistor 12 with an external circuit, and when the control signal 0 (0V) is input, the input terminal SB and the output terminal D of the high speed analog switch 11 are input. Is connected, and a contact failure signal input to the input terminal SB via the multi-turn variable resistor 12 (that is, the contact resistance) is output to the electronic control board through the output terminal D. In this state, it is possible to observe the operating state of the electronic control board by adjusting the variable resistance value and continuously changing the contact state.

FIG. 2A is a circuit diagram illustrating an operation state of a connection failure generating device when a normal signal is output. When the control signal 1 (+ 5V) is input to the exciting coil driving circuit 22, the exciting coil driving transistor Q of FIG. Is energized so that an electric current flows through the excitation coil 21a of the magnetic relay 21, and an input terminal A and an output terminal C of the magnetic relay 21 are connected to the input terminal A according to the excitation of the excitation coil 21a. The normal signal is output to the electronic control board through the output terminal C.

FIG. 2B is a circuit diagram illustrating an operation state of a contact failure generating device for generating a contact failure in an input signal using a relay. First, the dip switch 24 is adjusted to an off state so that the multiturn variable resistor 23 is connected to an external circuit. After separating from and, the variable resistance value is adjusted to the desired contact resistance value while the variable resistance value is measured by the variable resistance measuring terminal 25.

Thereafter, the dip switch 24 is adjusted to an on state to connect the multiturn variable resistor 23 to an external circuit, and then when the control signal 0 (0V) is input to the excitation coil driving circuit 22, the excitation coil driving of FIG. Since the transistor Q is turned off, no current is supplied to the excitation coil 21a of the magnetic relay 21, and the excitation coil 21a is not excited so that the input terminal B and the output terminal C of the magnetic relay 21 are not excited. Is connected to the contact bad signal input to the input terminal B via the multi-turn variable resistor 23 is output to the electronic control board through the output terminal C.

At this time, when the excitation coil driving transistor Q is turned off as the control signal 0 (0V) is input to the excitation coil driving circuit 22, spikes may be generated by the energy accumulated in the excitation coil 21a. In this case, as shown in FIG. 3, the diode D is connected and configured at both ends of the excitation coil 21a to prevent the same. In other words, when the excitation coil driving transistor Q is turned off, the current flowing through the excitation coil 21a is returned to the diode D to prevent the occurrence of spikes.

FIG. 4 shows an experimental waveform of a contact failure of an analog signal among input signals of an actual electronic control board. When the input signal gradually increases the multi-turn variable resistor 12 of FIG. When the resistance is increased), the voltage value input to the electronic control board is continuously decreased due to the voltage drop caused by the contact resistance.

5 shows an experimental waveform of a contact failure of a differential digital signal that is changed by ± 2.5V among input signals of an actual electronic control board. The input signal is a multiturn variable resistor 23 at a voltage value of ± 2.5V. When gradually increasing, the magnitude of the differential voltage value input to the electronic control board also decreases gradually.

As described above, according to the contact failure generating device of the terminal of the present invention, by analyzing a database of various malfunctions of the electronic control board for the contact failure (that is, the change in the contact resistance value) of each input and output signal of the electronic control board, The cause of malfunction of the electronic control board can be analyzed quickly and the cause can be easily removed, and the reliability of the electronic control board can be improved by quickly removing the cause of the malfunction, and the maintenance period and cost can be greatly reduced. .

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

Claims (4)

It consists of two input terminals and one output terminal for normal signal output and contact bad signal output.It is for outputting normal signal or bad contact signal to the electronic control board according to the control signal of 1 or 0 state input from outside. A high speed analog switch performing a switching operation; A multi-turn variable resistor connected to one input terminal for outputting a bad contact signal of the high-speed analog switch, and continuously changing the contact resistance by adjusting a variable resistance value to observe an operation state of the electronic control board; The multi-turn variable resistor is separated from an external circuit to measure a variable resistance value of the multi-turn variable resistor in an off state, and is configured between two input terminals of the high-speed analog switch. A dip switch connecting a resistor to an external circuit so that a contact failure signal is output to an output terminal through the multi-turn variable resistor; And Contact resistance generation of the terminal, characterized in that it comprises a variable resistance measuring terminal for adjusting the variable resistance value to the desired contact resistance value while measuring the variable resistance value of the multi-turn variable resistor when the dip switch is off Device. In order to reproduce the poor contact of the differential signal, high current or high voltage signal, it consists of the normal signal output, two input terminals and one output terminal for outputting the contact bad signal, and the excitation coil, and the excitation by the current input from the outside A magnetic relay configured to perform a relay operation for outputting a normal signal or a bad contact signal to the electronic control board depending on whether the coil is excited; An excitation coil driving circuit for outputting a current for controlling the relay operation of the magnetic relay to an excitation coil of the magnetic relay according to a control signal of a state of 1 or 0 input from an external device; A multi-turn variable resistor connected to one input terminal for outputting a bad contact signal of the magnetic relay and continuously changing the contact resistance by adjusting a variable resistance value to observe an operation state of the electronic control board; It is connected between the two input terminals of the magnetic relay, and in the off state to separate the multi-turn variable resistor from the external circuit to measure the variable resistance value of the multi-turn variable resistor, in the on state the multi-turn variable resistor A dip switch for connecting a contact failure signal to an output terminal through the multi-turn variable resistor by connecting a signal to an external circuit; And Contact resistance generation of the terminal, characterized in that it comprises a variable resistance measuring terminal for adjusting the variable resistance value to the desired contact resistance value while measuring the variable resistance value of the multi-turn variable resistor when the dip switch is off Device. The method of claim 2, The excitation coil drive circuit, An excitation coil driving transistor configured to conduct or open according to a control signal in a state of 1 or 0 input from the outside to supply or block a current to an excitation coil of the magnetic relay; And And a diode which prevents spikes by refluxing current flowing through the excitation coil when the excitation coil driving transistor is turned off. The method according to claim 1 or 2, The multi-turn variable resistor, Contact failure generator of a terminal, characterized in that the 10-turn variable resistor with a capacity of 1 MΩ (MΩ).

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