Relay monitoring device

Abstract

The utility model provides a relay monitoring device. The relay monitoring device comprises a single-chip microcomputer system, a coil voltage detection loop, a contact state detection loop, an address coding loop and a detection system power supply loop. The single-chip microcomputer system is connected with the coil voltage detection loop, the contact state detection loop and the address coding loop, and the single-chip microcomputer system, the coil voltage detection loop, the contact state detection loop and the address coding loop are all connected with the detection system power supply loop. The coil voltage detection loop and the contact state detection loop are connected with the relay. According to the invention, the coil voltage and contact level state of the relay can be detected in real time, and the contact actuation time and relay actuation times are calculated; if the relay breaks down, the relay with the fault can be positioned, the coil voltage of the relay with the fault, the level state of the corresponding contact and the action time of the contact can be obtained, and a reliable basis is provided for later vehicle state and fault analysis.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transportation control, and in particular relates to a relay monitoring device. Background Art

[0002] Relays are of irreplaceable importance in the rail vehicle industry. As a key component in the control circuit, relays are responsible for switching and protecting current to ensure safe and stable operation of trains. At the same time, relays can improve the level of automation of vehicles and reduce the complexity and errors of manual operations. In an emergency, relays can quickly cut off the power supply to prevent the accident from expanding and protect the lives of passengers. Relays play a vital role in the rail vehicle industry and provide a strong guarantee for the safe and efficient operation of trains.

[0003] The relay intelligent base product is an online monitoring device designed specifically for rail transit vehicles to monitor the relay coil voltage and contact level status in real time. By real-time monitoring and storing the relay coil voltage value and contact level status, it provides a reliable basis for later vehicle status and fault analysis.

[0004] The existing relay monitoring device cannot monitor the voltages of multiple relays at the same time, nor can it locate the faulty coil in time and detect the level state of the corresponding contact when a fault occurs. Therefore, it is urgent to solve these problems. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model provides a relay monitoring device to monitor multiple relays at the same time. The technical solution of this application is as follows:

[0006] A relay monitoring device comprises: a single chip computer system, a coil voltage detection circuit, a contact state detection circuit, an address coding circuit and a detection system power supply circuit;

[0007] The single-chip computer system is respectively connected to the coil voltage detection circuit, the contact state detection circuit and the address coding circuit, the single-chip computer system, the coil voltage detection circuit, the contact state detection circuit and the address coding circuit are all connected to the detection system power supply circuit, and the coil voltage detection circuit and the contact state detection circuit are both connected to the relay;

[0008] The contact state detection circuit is used to detect whether the relay coil, common, normally open and normally closed contacts are energized or de-energized. The address coding circuit is used to perform address coding on each relay when monitoring multiple relays.

[0009] Furthermore, the coil voltage detection circuit includes: a resistor R1, a resistor R2, a resistor R3, an input RC filter, an isolation chip and an output RC (Resistance Capacitance, resistor-capacitance) filter, the resistor R1, the resistor R2 and the resistor R3 are connected in series with each other, the resistor R1 is connected to the positive pole of the relay coil, the resistor R3 is connected to the negative pole of the relay coil, the input RC filter is connected in parallel to the resistor R2, the output end of the input RC filter is connected to the isolation chip and the output RC filter in sequence, the output end of the output RC filter is connected to the single-chip microcomputer in the single-chip microcomputer system, and the isolation chip is used to isolate the relay to be tested from the coil voltage detection circuit.

[0010] Furthermore, the contact state detection circuit includes: resistor R4, resistor R5, resistor R6, resistor R7 and a contact state detection chip, the input end VI1 (Voltage Input1) of the contact state detection chip is connected to one end of resistors R4 and R5, the other end of the resistor R4 is connected to the positive electrode of the relay coil, the other end of the resistor R5 is connected to the negative electrode of the relay coil, the input end VI2 (Voltage Input2) of the contact state detection chip is connected to one end of resistors R6 and R7, the other end of the resistor R6 is connected to the relay contact, the other end of the resistor R7 is connected to the negative electrode of the relay coil, and the output of the contact state detection chip uses SPI (Serial Peripheral interface) to connect to the single-chip microcomputer in the single-chip microcomputer system.

[0011] Furthermore, the address encoding loop includes multiple relay bases, which are connected in series in sequence; each relay base includes two optocouplers and a single-chip microcomputer; in each relay base, the first optocoupler, the single-chip microcomputer and the second optocoupler are connected in series in sequence.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] 1. This application can detect the relay coil voltage and contact level status in real time, calculate the contact action time and the number of relay actions; if the relay fails, it can also locate the faulty relay coil and obtain the coil voltage of the faulty relay, the level status of the corresponding contact and the contact action time, providing a reliable basis for the later vehicle status and fault analysis;

[0014] 2. This application can incorporate multiple relays into one system for monitoring, and perform address coding on multiple relays, thereby achieving accurate positioning of faulty relays, thereby improving monitoring efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural block diagram of a relay monitoring device of the utility model;

[0016] Figure 2 This is the circuit diagram of the coil voltage detection loop of the utility model;

[0017] Figure 3 This is the circuit diagram of the contact state detection circuit of the utility model;

[0018] Figure 4 This is the circuit diagram of the address encoding loop of the utility model. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, a relay monitoring device includes: a single chip computer system, a coil voltage detection circuit, a contact state detection circuit, an address encoding circuit and a detection system power supply circuit;

[0021] The single-chip computer system is respectively connected to the coil voltage detection circuit, the contact state detection circuit and the address coding circuit, the single-chip computer system, the coil voltage detection circuit, the contact state detection circuit and the address coding circuit are all connected to the detection system power supply circuit, and the coil voltage detection circuit and the contact state detection circuit are both connected to the relay;

[0022] The contact state detection circuit is used to detect whether the relay coil, common, normally open and normally closed contacts are energized or de-energized. The address coding circuit is used to perform address coding on each relay when monitoring multiple relays.

[0023] The power supply circuit of the detection system mainly reduces the external voltage to the voltage required for the operation of the system components and has an overvoltage protection function. The single-chip microcomputer system includes a single-chip microcomputer and peripheral components, processes the collected coil voltage and contact action time, calculates the coil voltage and the action time of the normally open / normally closed contacts, displays the current state of the contacts, and sends the above data to the designated location for display through the data bus.

[0024] Further, such as Figure 2As shown, the coil voltage detection circuit includes: a resistor R1, a resistor R2, a resistor R3, an input RC filter, an isolation chip of model AMC3301 and an output RC filter. The resistor R1, the resistor R2 and the resistor R3 are connected in series with each other, the resistor R1 is connected to the positive electrode of the relay coil, the resistor R3 is connected to the negative electrode of the relay coil, the input RC filter is connected in parallel to the resistor R2, the output end of the input RC filter is connected to the isolation chip and the output RC filter in sequence, the output end of the output RC filter is connected to the single-chip microcomputer in the single-chip microcomputer system, and the isolation chip is used to isolate the relay to be tested from the coil voltage detection circuit.

[0025] Specifically, the isolation chip used in the coil voltage detection circuit uses the chip's own capacitance isolation performance (isolation voltage 6000V) to isolate the on-board relay coil from the detection circuit, ensuring that the on-board relay contacts will not be affected when the detection circuit is abnormal. For details on the detection principle, see the attached Figure 2 : After collecting the relay coil voltage, the coil voltage is reduced through resistors R1~R3, and the signal is sent to the chip after passing through the input RC filter. The chip isolates and processes the signal and transmits it to the microcontroller through the output RC filter for calculation.

[0026] Further, such as Figure 3 As shown, the contact state detection circuit includes: a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a contact state detection chip, an input terminal VI1 of the contact state detection chip is connected to one end of the resistors R4 and R5, the other end of the resistor R4 is connected to the positive electrode of the relay coil, the other end of the resistor R5 is connected to the negative electrode of the relay coil, an input terminal VI2 of the contact state detection chip is connected to one end of the resistors R6 and R7, the other end of the resistor R6 is connected to the relay contact, the other end of the resistor R7 is connected to the negative electrode of the relay coil, and the output of the contact state detection chip uses SPI to connect the single-chip microcomputer in the single-chip microcomputer system.

[0027] Specifically, the detection principle of the contact state detection circuit is detailed in the attached Figure 3 : The contact status acquisition point is on the relay contact, and through two voltage-dividing resistors, such as R4 and R5, the contact voltage is reduced and sent to the input side of the contact status detection chip. The contact status detection chip converts the reduced contact voltage into a digital signal internally, that is, the current state of the relay contact is a high level or low level signal, and sends the digital signal to the single-chip computer system through the bus.

[0028] Normally open contact pull-in time logic: After the coil is powered on, the contact state detection chip collects the state of the positive pole of the coil from low level to high level, the single-chip microcomputer takes this as the start mark, and the system starts timing; wait for the contact state detection chip to collect the state of all normally open contacts from low level to high level, the single-chip microcomputer takes this as the end mark, stops timing, and calculates the time difference between the two. Normally closed contact pull-in time logic: After the coil is powered off, the contact state detection chip collects the state of the positive pole of the coil from high level to low level, the single-chip microcomputer takes this as the start mark, and the system starts timing; wait for the contact state detection chip to collect the state of all normally closed contacts from low level to high level, the single-chip microcomputer takes this as the end mark, stops timing, and calculates the time difference between the two. The contact state detection chip collects the contact signal, sends it to the single-chip microcomputer through the data bus after isolation, and the single-chip microcomputer calculates the normally open / normally closed contact pull-in time according to the above logic, and sends the calculated data to the designated location for display through the data bus. The single chip microcomputer system can also send the current state of the contact, that is, power on (the contact state detection chip detects that the contact is at a high level) or power off (the contact state detection chip detects that the contact is at a low level) to a designated location for display through the data bus.

[0029] Further, such as Figure 4 As shown, the address encoding circuit includes multiple relay bases, which are connected in series in sequence; each relay base includes two optocouplers and a single-chip microcomputer; in each relay base, the first optocoupler, the single-chip microcomputer and the second optocoupler are connected in series in sequence.

[0030] When monitoring multiple relays, the circuit can be used to encode the relays according to the quantity required by different customers, and multiple relays can be connected in series to one system. The detection principle is detailed in the attached Figure 4 : A pulse signal is provided externally, so that the first optocoupler of the first relay base is turned on, and the microcontroller 1 of the base receives the first optocoupler turn-on signal and writes the address to the base; after the address is written, the microcontroller outputs a high level, so that the second optocoupler is turned on, and a pulse signal is output to configure the next relay.

[0031] This application can detect the relay coil voltage and contact level status in real time, calculate the contact action time and the number of relay actions; if a relay fails, the faulty relay coil can be located in time, the relay voltage and contact level status at this time can be collected, and the contact action time can be calculated, providing a reliable basis for subsequent vehicle status and fault analysis.

[0032] The above embodiments are preferred examples for implementing the present invention, and the present invention is not limited to the above embodiments. Any non-essential additions and substitutions made by those skilled in the art based on the technical features of the present invention are within the protection scope of the present invention.

Claims

1. A relay monitoring device, characterized in that: include: Single chip computer system, coil voltage detection circuit, contact state detection circuit, address encoding circuit and detection system power supply circuit; The single-chip computer system is respectively connected to the coil voltage detection circuit, the contact state detection circuit and the address coding circuit, the single-chip computer system, the coil voltage detection circuit, the contact state detection circuit and the address coding circuit are all connected to the detection system power supply circuit, and the coil voltage detection circuit and the contact state detection circuit are both connected to the relay; The contact state detection circuit is used to detect whether the relay coil, common, normally open and normally closed contacts are energized or de-energized. The address coding circuit is used to perform address coding on each relay when monitoring multiple relays.

2. A relay monitoring device as claimed in claim 1, characterized in that: The coil voltage detection circuit includes: a resistor R1, a resistor R2, a resistor R3, an input RC filter, an isolation chip and an output RC filter. The resistor R1, the resistor R2 and the resistor R3 are connected in series with each other, the resistor R1 is connected to the positive electrode of the relay coil, the resistor R3 is connected to the negative electrode of the relay coil, the input RC filter is connected in parallel to the resistor R2, the output end of the input RC filter is connected to the isolation chip and the output RC filter in sequence, the output end of the output RC filter is connected to the single-chip microcomputer in the single-chip microcomputer system, and the isolation chip is used to isolate the relay to be tested from the coil voltage detection circuit.

3. A relay monitoring device as claimed in claim 1 or 2, characterized in that: The contact state detection circuit includes: resistor R4, resistor R5, resistor R6, resistor R7 and a contact state detection chip, the input end VI1 of the contact state detection chip is connected to one end of the resistors R4 and R5, the other end of the resistor R4 is connected to the positive electrode of the relay coil, the other end of the resistor R5 is connected to the negative electrode of the relay coil, the input end VI2 of the contact state detection chip is connected to one end of the resistors R6 and R7, the other end of the resistor R6 is connected to the relay contact, the other end of the resistor R7 is connected to the negative electrode of the relay coil, and the output of the contact state detection chip uses SPI to connect the single-chip microcomputer in the single-chip microcomputer system.

4. A relay monitoring device as claimed in claim 3, characterized in that: The address encoding loop includes a plurality of relay bases, which are connected in series in sequence; each relay base includes two optocouplers and a single-chip microcomputer; in each relay base, the first optocoupler, the single-chip microcomputer and the second optocoupler are connected in series in sequence.

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