KR20220113190A - Relay contact error detection - Google Patents

Abstract

The present invention relates to a relay contact error detector, comprising: a main plate; a printed circuit board provided on an upper surface of the main plate; a plurality of Hall effect current sensors mounted on the upper surface of the printed circuit board; a first cable terminal block having a plurality of channels in a lower part and mounted on one end of the upper surface of the printed circuit board; a second cable terminal block having a plurality of channels respectively energized with the channels of the first cable terminal block and mounted on one end of the upper surface of the printed circuit board; an upper casing provided on the upper surface of the printed circuit board to accommodate the current sensors; a display part energized with the printed circuit board; a socket mounting rail provided on the other end of the upper surface of the upper casing; a relay socket mounted on the socket mounting rail and energized with channels of the second cable terminal block; a relay mounted on the relay socket; and a controller mounted on the printed circuit board to control the printed circuit board, the display part and the relay. Therefore, a sensor cable for checking operation is unnecessary, a sensing device for checking operation inside an electric load can be removed, the structure of the electric load device is simplified, and an installation distance is extended owing to the removal of the sensor cable.

Description

Relay contact error detection {Relay contact error detection}

The present invention relates to a relay contact abnormality detector.

In particular, the present invention relates to a relay contact abnormality detector capable of reducing damage (defective products) caused by abnormal operation caused by electric loads operating with power supplied through a relay contact receiving insufficient power.

Republic of Korea Patent No. 1712258 (registration date: February 24, 2017, title of invention: relay fusion detection device and method) is a positive relay that is the voltage between the positive electrode of the battery and one end of the inverter connected through the positive relay and the negative electrode of the battery a measuring unit for measuring one or more of a voltage, a negative relay voltage that is a voltage between the other end of the inverter connected through a negative and negative relay of the battery and a positive electrode of the battery, a voltage of the battery, and a voltage of the inverter; and a determination unit determining whether the positive relay and the negative relay are fused by comparing the magnitude of the voltage values measured by the measurement unit, wherein the determination unit includes a product of a preset first constant and the voltage value of the battery If it is less than the inverter voltage value, the product of a preset second constant and the voltage value of the battery and the negative relay or the positive relay voltage value are compared, and the product of the preset second constant and the inverter voltage value and the There is disclosed a relay fusion detection device, characterized in that by comparing the voltage values of the positive relay or the negative relay, it is determined whether the positive relay or the negative relay is fused.

While this prior art claims that it is possible to provide a relay fusion detection device and method that can determine the fusion of the relay even in a state where the relay is not turned on, it detects that the relay is fused by detecting the power of the power relay. This method measures the potential difference between two points without measuring the circulating current, which has the disadvantage of causing errors such as short circuit, short circuit, and increased resistance of the cable contact.

In addition, Republic of Korea Patent No. 1321387 (Registration Date: October 17, 2013, Title of Invention: Welding Detection Device of Relay) switches relay contacts based on a switching signal input from a power supply unit and a control unit supplying power used inside the relay. A first relay unit that maintains or cuts off an electrical connection state with the load, and is connected to the output side of the first relay unit, and outputs a signal for controlling the operation of the load side by switching the relay contact based on a switching signal input from the control unit a second relay unit that is connected to the output side of the second relay unit, and generates a sensing signal according to whether the second relay unit is switched and feeds it back to the control unit; A switching power generation unit that oscillates and outputs the switching power for use in the welding detection unit while disconnecting the external power, and a switching signal for electrical connection with a load based on an operation signal input from the outside to the first relay unit At the same time as outputting, a switching signal for outputting a signal for controlling the operation of the load is output to the second relay unit, and based on the detection signal fed back from the welding detection unit, it is determined whether the contact of the second relay unit is welded, , a welding detection device of a relay including a control unit for outputting a switching signal for blocking electrical connection with a load to the first relay unit when it is determined that the contact of the second relay unit is welded is disclosed.

In this prior art, the welding detection circuit is directly connected to the output side of the relay, and through this, the welding of the relay contact is detected by overcurrent, heat, etc., so that the control unit blocks the operation error of the relay. It is claimed that it is possible to prevent accidents that may occur on the load side due to this, and thus has the effect of increasing the quality of relays used in various industrial equipment. It is a method that can be used only in a limited environment, and there is a fundamental problem in that the use is limited according to the type of load.

The purpose of the present invention, created to solve the above problems, is to recognize the rated current value for each type of electric load, display the abnormality of the electric loads with an LED, and fundamentally solve the chattering that occurs during relay operation. Of course, it is to provide a relay contact abnormality detector that can be installed without replacing the cables connected to the existing relay sockets.

This object of the present invention, the main plate and; a printed circuit board provided on an upper surface of the main plate; a plurality of Hall effect current sensors mounted on the upper surface of the printed circuit board; a first cable terminal block having a plurality of channels at a lower portion and mounted on one end of an upper surface of the printed circuit board; a second cable terminal block having a plurality of channels respectively energized with the channels of the first cable terminal block and mounted on one end of the upper surface of the printed circuit board; an upper casing provided on an upper surface of the printed circuit board to accommodate the current sensor; a display unit energized with the printed circuit board; a socket mounting rail provided on the other end of the upper surface of the upper casing; a relay socket mounted on the socket mounting rail and energized with channels of the second cable terminal block; a relay mounted on the relay socket; It may be achieved by a relay contact abnormality detector comprising a controller mounted on the printed circuit board to control the printed circuit board, the display unit, and the relay, respectively.

Preferably, the present invention is characterized in that it further comprises a rail mount provided on the lower surface of the main plate.

Preferably, it further comprises a volume switch for inputting the set value of the controller of the present invention, characterized in that it further comprises the push button to select the analog signal of the current sensor input to the controller.

In the present invention as described above, the sensor cable for operation confirmation is unnecessary, the sensing device for operation confirmation inside the electric load can be removed, the structure of the electric load apparatus is simplified, and the installation distance is extended due to the removal of the sensor cable. It works. In addition, the present invention does not have any restrictions on space and number of installations, and since the state information of the monitored load is transmitted to the upper system, unlimited real-time multi-channel monitoring is possible with the edging computer function, as well as a current measurement method using a Hall sensor. Due to this, it can be manufactured in the same size as the relay base, so it can be installed under the relay base by applying a DIN rail and a jannel clamp.

1 is a front view showing a relay contact abnormality detector according to the present invention.
FIG. 2 is a block diagram of FIG. 1 ;
FIG. 3 is a flowchart illustrating the control method of FIG. 1 .
4A is a circuit diagram showing a method for monitoring an electric load according to the prior art.
Figure 4b is a circuit diagram showing a method of monitoring an electrical load using the relay contact abnormality detector of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 , the relay contact abnormality detector 100 according to the present invention includes a main plate 10 , a printed circuit board 30 , an upper casing 50 , a relay socket 70 , and a relay 90 . , Rail Mount (RM), Socket Mount Rail (RL), Current Sensor (CT), Cable Terminal Block (T1) (T2), Display (DP), Volume Switch (VS), Push Button (PB) and Controller (CTB) ) consists of

The main plate 10 consists of a plate-shaped structure.

The rail mount RM is provided on the lower surface of the main plate 10 .

The printed circuit board 30 is provided on the upper surface of the main plate 10 . Here, the printed circuit board 30 is a board on which electric and electronic components such as an integrated circuit, a resistor, a small battery (coin type), a tab connected to a connector (TAB) or a switch are mounted. A detailed description or illustration thereof will be omitted.

A plurality of current sensors CT are mounted on the upper surface of the printed circuit board 30 .

Although only one current sensor CT of this embodiment is shown to be mounted on the upper surface of the printed circuit board 30, this is only shown for convenience, and is a Hall effect current sensor.

In addition, the current sensor CT in this embodiment can measure without loss of current flowing through the relay contact point during measurement due to the Hall effect current sensor among various types of current sensors. When the measured voltage is less than AC 220V and the current is less than 30A, the size can be manufactured to be 30mm wide.

The first and second cable terminal blocks T1 and T2 are respectively energized and mounted on one end of the upper surface of the printed circuit board 30 .

The first cable terminal block T1 has a plurality of channels at the bottom and is mounted on one end of the upper surface of the printed circuit board, and the second cable terminal block T2 conducts electricity with the channels of the first cable terminal block T1, respectively. It has a plurality of channels and is mounted on one end of the upper surface of the printed circuit board (30).

The upper casing 50 is provided on the upper surface of the printed circuit board 30 to accommodate the current sensor CT.

The display unit DP is provided to conduct electricity with the printed circuit board 30 .

Here, the display unit DP is composed of an LED display lamp, and it is clarified in advance that a general LCD panel can be used.

The socket mounting rail RL is provided at the other end of the upper surface of the upper casing 50 .

The relay socket 70 is mounted on the socket mounting rail RL, and is electrically connected to the second cable terminal block T2. Here, the relay socket 70 is provided with channels that conduct one-to-one conduction with the channels of the second cable terminal T2, respectively. Unexplained code "CT1" is a cable for relay connection.

The relay 90 is mounted on the relay socket 70 .

Here, since the relay socket 70 and the relay 90 are well-known components, detailed description or illustration thereof will be omitted.

The first cable terminal block T1 is connected to a cable for relay coil operation, and the current passing through the current sensor CT is connected to the relay coil connection terminal of the relay socket 90 through a first cable (not shown). The second cable terminal block T2 is connected to the cable connected to the relay contact common, and the current passing through the current sensor CT is transferred to the relay contact common terminal of the relay socket 90 through the second cable (not shown). connected

The controller CTB is mounted on the printed circuit board 30 to control the printed circuit board 30 , the display unit DP, and the relay 90 , respectively.

Here, it further includes a volume switch (VS) for inputting a set value of the controller (CTB). In addition, the controller (CTB) further includes two push buttons (PB) for instructing a setting operation and a reset operation.

The relay contact abnormality detector 100 of this embodiment has a hall effect current sensor that can detect abnormal operations of electric load devices installed at remote points without a sensor cable, and can be integrated into a relay socket size.

The conventional method of monitoring an electrical load shown in FIG. 4A is a method of determining whether an operation is performed by a sensor signal returned from the electrical load, whereas the monitoring method of the present invention shown in FIG. 4B shows that the electrical load performs electrical work. This is a method that measures the phenomenon (the flow of electric charge) that occurs during operation and judges that the operation is abnormal if it is less than the minimum amount required for operation.

Therefore, in the monitoring method of the present invention, first, the sensor cable for operation confirmation is unnecessary, second, the sensing device for operation confirmation inside the electric load can be removed, thirdly, the structure of the electric load apparatus is simple, and fourth, due to the removal of the sensor cable There is an effect that the installation separation distance can be extended.

The method using the relay contact abnormality detector 100 according to the present invention to detect an abnormal operation of an electric load measures the magnetic field generated inside the semiconductor, so there is no change in inductance and reactance in the line, and a signal amplifier inside the sensor is built-in, so PLC can measure directly without signal conversion as well as measure directly without signal conversion.

The method of judging abnormal operation by the measured current signal is as follows.

1. Convert the sensor signal to the controller (CTB)

The analog signal input from the current sensor (CT) is converted into a digital signal, and at this time, a filter program is used to compensate for the distortion of the noise signal.

2. Process current signal (analog signal) as RMS value

Measurement of AC and DC can be performed in a single device.

3. Current signal analysis

The current generated during operation is defined by simultaneously measuring the current applied to the relay operation coil and the current passing through the relay contact point.

4. Set value adjustment volume

Acquire 2 cycles of the current in the open and closed state of the relay contact, measure the average value, rms value, maximum value, and minimum value and set it as a standard Thus, the increase/decrease and decrease are identified and defined as an abnormal state.

5. Display operation and status display

Step 1. Current measurement with relay contact open by setting button

Step 2. Current measurement with relay contact closed by setting button

Step 3. Set the magnification with the set volume (check the status with the 3 color LEDs present in each channel)

Step 4. When current is applied to the relay operation coil by the setting button, the current passing through the relay contact is automatically measured.

Step 5. When an abnormality is detected, the abnormality is transmitted to the upper system and the abnormal state is displayed using the three-color LED.

Step 6. When the user checks the status, the situation is released with the reset button

Step 7. Restart automatic monitoring by setting button

Although the present invention as described above is limited to one embodiment, it is clear that all embodiments modified based on the technical idea of the present invention are not limited thereto and fall within the scope of the present invention.

10: main plate 30: printed circuit board
50: upper casing 70: relay socket
90: relay
CTB : Controller
100: relay contact abnormality detector

Claims (3)

main plate;
a printed circuit board provided on an upper surface of the main plate;
a plurality of Hall effect current sensors mounted on the upper surface of the printed circuit board;
a first cable terminal block having a plurality of channels at a lower portion and mounted on one end of an upper surface of the printed circuit board;
a second cable terminal block having a plurality of channels respectively energized with the channels of the first cable terminal block and mounted on one end of the upper surface of the printed circuit board;
an upper casing provided on an upper surface of the printed circuit board to accommodate the current sensor;
a display unit energized with the printed circuit board;
a socket mounting rail provided on the other end of the upper surface of the upper casing;
a relay socket mounted on the socket mounting rail and energized with channels of the second cable terminal block;
a relay mounted on the relay socket;
A relay contact abnormality detector comprising a controller mounted on the printed circuit board to control the printed circuit board, the display unit, and the relay, respectively.
The method of claim 1,
Relay contact abnormality detector, characterized in that it further comprises a rail mount provided on the lower surface of the main plate.
The method of claim 1,
Further comprising a volume switch for inputting the set value of the controller,
Relay contact abnormality detector, characterized in that it further comprises the push button to select the analog signal of the current sensor input to the controller.

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