Train high and low voltage terminal component intelligent detection circuit

Abstract

The application discloses a kind of train high-low voltage terminal component intelligent detection circuit scheme, it is related to train instrument intelligent detection field, mainly realize the intelligent detection of AC network voltage table, auxiliary voltage table, train DC network voltage table, high voltage DC converter.The application simulates the input voltage of train DC network voltage table, AC network voltage table, auxiliary voltage table, high voltage DC converter using programmable controller PLC, touch screen and switching power supply, compare the voltage of simulation table on touch screen with the voltage shown by measured train DC network voltage table, AC network voltage table, auxiliary voltage table, realize fault judgment by calculating whether the difference between them is within the required range;The output voltage of high voltage DC converter is fed back to programmable controller PLC, and the difference is calculated by comparing the reference voltage and the feedback voltage conversion value by programmable controller PLC, and whether it is within the required range is judged, and whether it is "fault" or "normal" is displayed on touch screen, to realize intelligent detection.

Description

Technical Field

[0001] The invention discloses an intelligent detection circuit for high and low voltage terminal components of a train, and relates to the field of intelligent detection of train instruments. Background Art

[0002] The grid voltage used in my country's trains is mainly 25000VAC or 1500VDC. Due to the defects of high voltage, complicated operation procedures and high risk, terminal equipment such as DC high-voltage meters, AC high-voltage meters, DC auxiliary voltage meters, and high-voltage DC converters are not convenient to be directly connected to the train grid voltage for use.

[0003] The present invention utilizes a programmable controller (PLC) and touch screen technology, combined with a switching power supply, to simulate the voltages of different high-voltage components, and simultaneously simulates the input voltages of an AC grid voltage meter, an auxiliary voltage meter, a high-voltage DC converter, and a train DC grid voltage meter. Faults are detected by comparing the voltage values ​​displayed by the simulated AC grid voltage meter, the auxiliary voltage meter, the DC grid voltage meter, and the meter under test. The detection of the high-voltage DC converter adopts fully intelligent detection. The programmable controller (PLC) automatically calculates the difference and determines the fault by comparing the converted values ​​of the simulated voltage and the feedback voltage, thus realizing intelligent detection. Summary of the Invention

[0004] In response to the above-mentioned problems, the present invention utilizes a programmable controller (PLC), a touch screen, and a switching power supply to simulate the input voltages of the train's DC network voltage meter, AC network voltage meter, auxiliary voltage meter, and high-voltage DC converter, compares the voltage on the touch screen with the voltages displayed on the three physical meters of the tested train's DC network voltage meter, AC network voltage meter, and auxiliary voltage meter, and calculates whether the difference between them is within the required range to achieve fault judgment; the output voltage of the high-voltage DC converter is fed back to the programmable controller (PLC), which calculates the difference by comparing the reference voltage and the feedback voltage value, and automatically determines whether it is within the required range, and displays "fault" or "normal" on the touch screen, thereby achieving intelligent detection.

[0005] The technical solution adopted in the present invention is as follows:

[0006] The invention discloses an intelligent detection circuit for high and low voltage terminal components of a train, mainly comprising a power supply circuit, a programmable controller, a touch screen, a plurality of switching power supply modules, a DC network voltage meter to be tested, an AC network voltage meter to be tested, an auxiliary voltage meter to be tested, and a high voltage DC converter to be tested.

[0007] The programmable controller and touch screen are the core of this intelligent detection circuit. The programmable controller is connected to the touch screen via an Ethernet port. The touch screen simulates a virtual AC network voltage meter, auxiliary voltage meter, DC network voltage meter, and high-voltage DC converter, and displays the voltage values ​​of the AC network voltage meter, auxiliary voltage meter, DC network voltage meter, and high-voltage DC converter in the programmable controller in real time. The voltage values ​​of the AC network voltage meter, auxiliary voltage meter, and DC network voltage meter under test can be input through a virtual keyboard on the touch screen working interface. By comparing the voltage values ​​of the AC network voltage meter, auxiliary voltage meter, and DC network voltage meter on the touch screen with the voltage values ​​of the AC network voltage meter, auxiliary voltage meter, and DC network voltage meter under test, if the difference is within a specified value range, the device under test is judged to be "normal", otherwise it is "faulty". The programmable controller compares the voltage value of the virtual high-voltage DC converter with the output voltage value of the high-voltage DC converter under test. If the difference is within the specified value range, the touch screen displays "normal" for the high-voltage DC converter under test; otherwise, it displays "faulty".

[0008] The power control circuit consists of a leakage protection circuit breaker QF, a self-locking illuminated pushbutton SB, a contactor KM, and wires. The incoming wires L and N of the leakage protection circuit breaker QF are connected to a 220VAC power supply. The outgoing wire L' of the leakage protection circuit breaker QF is divided into two paths, one connected to the self-locking illuminated pushbutton SB, and the other connected to the main contact 1 of the contactor KM. The outgoing wire L" of the self-locking illuminated pushbutton is connected to the L end of the contactor KM coil. The N end of the contactor KM coil is connected in parallel to the outgoing wire N' of the leakage protection circuit breaker QF and the main contact 3 or 5 of the contactor KM through a wire. The main contacts 2, 4, or 6 of the contactor KM are connected to wires L1 and N1, respectively.

[0009] The multiple switching power supply modules include switching power supply 1, switching power supply 2, switching power supply 3, switching power supply 4, and switching power supply 5; wherein, L and N of the switching power supply 5 are respectively connected to the main contact output lines L1 and N1 of the contactor KM through wires, the output end + of the switching power supply 5 is connected to the COM end of the programmable controller through a wire, one end of the digital output port 1, digital output port 2, digital output port 3, and digital output port 4 of the programmable controller is connected to the COM end of the programmable controller, and the other ends of the digital output port 1, digital output port 2, digital output port 3, and digital output port 4 of the programmable controller are respectively connected to the relays KA1, KA2, KA3, and KA4 through wires. The coil 1 end is connected, and the coil 2 ends of the relays KA1, KA2, KA3, and KA4 are connected in parallel and connected to the output terminal - of the switching power supply 5; the normally open contact input ends of the relays KA1, KA2, KA3, and KA4 are connected in parallel and connected to L1 through a wire, and the normally open contact output ends of the relays KA1, KA2, KA3, and KA4 are respectively connected to the L ends of the switching power supply 1, the switching power supply 2, the switching power supply 3, and the switching power supply 4 through a wire; the backlight interfaces + and - of the AC network voltage meter, the DC network voltage meter, and the auxiliary voltage meter are connected in parallel with wires and connected to the output terminals + and - of the switching power supply 1. The output voltage of the switching power supply 1 is consistent with the backlight lighting voltage of the AC network voltage meter, the DC network voltage meter, and the auxiliary voltage meter.

[0010] The programmable controller, switching power supply 2, switching power supply 3, switching power supply 4 and the measured AC network voltage meter, auxiliary voltage meter, high-voltage DC converter, and DC network voltage meter have the following specific relationship:

[0011] (1) The + and - terminals of the analog output port 1 of the programmable controller are connected to the + and - terminals of the control port of the switching power supply 2 through wires. The analog output port signal of the programmable controller matches the nominal signal of the control port of the switching power supply 2. The + and - terminals of the output port of the switching power supply 2 are connected to the + and - terminals of the measuring port of the AC network voltage meter. The output voltage of the switching power supply 2 matches the nominal input voltage of the AC network voltage meter.

[0012] (2) The + and - terminals of the analog output port 2 of the programmable controller are connected to the + and - terminals of the control port of the switching power supply 3 through wires. The analog output port signal of the programmable controller matches the nominal signal of the control port of the switching power supply 3. The + and - terminals of the output port of the switching power supply 3 are connected to the + and - measuring ports of the auxiliary pressure meter. The output voltage of the switching power supply 3 matches the nominal input voltage of the auxiliary pressure meter.

[0013] (3) PLC analog output port 3 +, - end through the wire and the switch power supply 4 control port +, - end connected, this PLC analog output port signal and switch power supply 4 control end nominal signal is matched; Switch power supply 4 output +, - through the wire and high voltage DC converter input +, - connected, switch power supply 4 output voltage and high voltage DC converter nominal input voltage is matched; High voltage DC converter output +, - through the wire and PLC analog input port 1 +, - connected, high voltage DC converter output voltage and PLC analog input port signal is matched;

[0014] (4) PLC analog output port 4 +, - end through the wire and DC network voltage table measurement end +, - end connected, this PLC analog output voltage and DC network voltage table nominal input voltage is matched. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the power supply circuit working principle Figure 1 .

[0016] Figure 2 is the power supply circuit working principle Figure 2 .

[0017] Figure 3 is the high and low voltage terminal component control diagram.

[0018] Figure 4 is the high and low voltage terminal component intelligent detection circuit principle diagram.

[0019] Figure 5 is an example of the actual application circuit working principle diagram. DETAILED DESCRIPTION

[0020] The embodiment is only for one of the train high and low voltage terminal component intelligent detection circuit working principle of an example, and does not limit the scope of the present invention.

[0021] In order to make the purpose, technical scheme and advantages of the present invention more clear and obvious, the present invention is further described in detail below in combination with the drawings and examples.

[0022] A train high and low voltage terminal component intelligent detection circuit, further, the above scheme is applied to the example, described as follows:

[0023] A train high and low voltage terminal component intelligent detection circuit, mainly by power supply circuit, PLC, touch screen, a plurality of switch power supply module and measured DC network voltage table, measured AC network voltage table, measured auxiliary voltage table, measured high voltage DC converter.

[0024] The programmable controller (S7-1200) and touch screen are the core of this intelligent detection circuit. The S7-1200 is connected to the touch screen via an Ethernet port. The touch screen simulates a virtual AC mains voltage meter, auxiliary voltage meter, DC mains voltage meter, and high-voltage DC converter. The S7-1200 displays the voltage values ​​of the simulated AC mains voltage meter, auxiliary voltage meter, DC mains voltage meter, and high-voltage DC converter in real time. The voltage values ​​of the AC mains voltage meter, auxiliary voltage meter, and DC mains voltage meter under test can be input through a virtual keyboard on the touch screen working interface. By comparing the voltage values ​​of the AC mains voltage meter, auxiliary voltage meter, and DC mains voltage meter on the touch screen with the voltage values ​​of the AC mains voltage meter, auxiliary voltage meter, and DC mains voltage meter under test, if the difference is within ±5%, the device under test is judged to be "normal"; otherwise, it is "faulty." The S7-1200 compares the voltage value of the virtual high-voltage DC converter with the output voltage value of the high-voltage DC converter under test. If the difference is within ±5%, the touch screen displays the voltage value of the high-voltage DC converter under test as "normal"; otherwise, it displays "faulty."

[0025] The power control circuit consists of a leakage protection circuit breaker QF, a self-locking illuminated pushbutton SB, a contactor KM, and wires. The incoming wires L and N of the leakage protection circuit breaker QF are connected to a 220VAC power supply. The outgoing wire L' of the leakage protection circuit breaker QF is divided into two paths, one connected to the self-locking illuminated pushbutton SB, and the other connected to the main contact 1 of the contactor KM. The outgoing wire L" of the self-locking illuminated pushbutton is connected to the L end of the contactor KM coil. The N end of the contactor KM coil is connected in parallel to the outgoing wire N' of the leakage protection circuit breaker QF and the main contact 3 or 5 of the contactor KM through a wire. The main contacts 2, 4, or 6 of the contactor KM are connected to wires L1 and N1, respectively.

[0026] Multiple switching power supply modules include switching power supply 1, switching power supply 2, switching power supply 3, switching power supply 4, and switching power supply 5; wherein, L and N of switching power supply 5 are connected to main contact output lines L1 and N1 of contactor KM respectively through wires, output terminal + of switching power supply 5 is connected to COM terminal of programmable controller through wires, one end of Q0.0, Q0.1, Q0.2, Q0.3 of programmable controller is connected to COM terminal of programmable controller, the other end of Q0.0, Q0.1, Q0.2, Q0.3 of programmable controller is connected to coil 1 end of relay KA1, KA2, KA3, KA4 respectively through wires, relay KA 1. The 2 ends of the coils KA2, KA3, and KA4 are connected in parallel and connected to the output terminal - of the switching power supply 5; the normally open contact input terminals of the relays KA1, KA2, KA3, and KA4 are connected in parallel and connected to L1 through wires, and the normally open contact output terminals of the relays KA1, KA2, KA3, and KA4 are respectively connected to the L terminals of the switching power supply 1, the switching power supply 2, the switching power supply 3, and the switching power supply 4 through wires; the backlight interfaces + and - of the AC network voltmeter, DC network voltmeter, and auxiliary voltmeter are connected in parallel with wires and connected to the output terminals + and - of the switching power supply 1. The 110VDC output of the switching power supply 1 is consistent with the backlight lighting requirement voltage of the AC network voltmeter, DC network voltmeter, and auxiliary voltmeter.

[0027] The programmable controller, switching power supply 2, switching power supply 3, switching power supply 4 and the measured AC network voltage meter, auxiliary voltage meter, high-voltage DC converter, and DC network voltage meter have the following specific relationship:

[0028] (1) The + and - terminals of the S7-1200 analog output port AQO are connected to the + and - terminals of the switch power supply 2 control port through wires. The output signal of AQO (0-10V) matches the input signal of the switch power supply 2 control port (0-10V). The + and - terminals of the switch power supply 2 output are connected to the + and - terminals of the AC network voltage meter. The output voltage range of the switch power supply 3 is 0-150VDC. The output voltage of the switch power supply 2 (0-150V) matches the nominal input voltage of the AC network voltage meter (0-150V).

[0029] (2) The + and - terminals of the S7-1200 analog output port AQ1 are connected to the + and - terminals of the switch power supply 3 control port through wires. The output signal of AQ1 (0-10V) matches the input signal of the switch power supply 3 control port (0-10V). The output terminals of the switch power supply 3 (+ and -) are connected to the measurement terminals of the auxiliary pressure meter (+ and -). The output voltage of the switch power supply 3 (0-150V) matches the nominal input voltage of the auxiliary pressure meter (0-150V).

[0030] (3) The + and - terminals of the analog output port AQ2 of the S7-1200 are connected to the + and - terminals of the control port of the switching power supply 4 through wires, and the output signal of AQ2 (0-10V) matches the input signal of the control port of the switching power supply 4 (0-10V); the output terminals + and - of the switching power supply 4 are connected to the + and - input terminals of the high-voltage DC converter, and the output voltage of the switching power supply 4 (0-600V) matches the nominal input voltage of the high-voltage DC converter (0-600V); the output terminals + and - of the high-voltage DC converter are connected to the + and - terminals of the analog input port AWO of the S7-1200, and the output voltage of the high-voltage DC converter (0-10V) matches the analog input port 0-10V of the programmable controller;

[0031] (4) The + and - terminals of the analog output port AQ3 of the S7-1200 are connected to the + and - terminals of the DC network voltage meter through wires. The output voltage 0~10V of the analog output port AQ3 of the S7-1200 matches the input voltage 0~10V of the DC network voltage meter.

[0032] See the attached circuit diagram of the embodiment. Figure 5 .

[0033] The above are preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An intelligent detection circuit for high and low voltage terminal equipment on a train, characterized in that: include: Power supply circuit; a programmable controller electrically connected to the power supply circuit; A touch screen in communication with the programmable controller; A plurality of switching power supply modules are electrically connected to the programmable controller respectively; The DC network voltage meter under test, the AC network voltage meter under test, the auxiliary voltage meter under test and the high-voltage DC converter under test are electrically connected to the corresponding switching power supply module and the programmable controller respectively; The programmable controller controls the output of each switching power supply module and collects feedback signals from each device under test to achieve intelligent detection of each device under test. Wherein, the touch screen is configured as follows: Displays virtual AC grid voltage meter, auxiliary voltage meter, DC grid voltage meter and high-voltage DC converter interface; Displaying in real time the voltage value of each device under test collected by the programmable controller; Provides a virtual keyboard interface for inputting the preset voltage value of each device under test; Wherein, the programmable controller is configured as follows: The preset voltage value is compared with the actually collected voltage values ​​of each device under test. When the difference is within a preset threshold range, the device under test is determined to be normal; otherwise, it is determined to be faulty.

2. The intelligent detection circuit according to claim 1, characterized in that: The power supply circuit includes: The circuit breaker QF with leakage protection has its input connected to a 220V AC power supply; A self-locking illuminated button SB, the input end of which is connected to one output of the circuit breaker; The contactor KM has a coil loop connected in series with the self-locking illuminated button, a main contact input end connected to another output of the circuit breaker, and a main contact output end providing working power L1 and N1 for the intelligent detection circuit.

3. The intelligent detection circuit according to claim 1, wherein: The plurality of switching power supply modules include: A switching power supply 5, whose input end is connected to the output ends L1 and N1 of the power supply circuit, and whose output end supplies power to the programmable controller; Switching power supplies 2-4 are connected to the power supply circuit through corresponding relays KA1-KA4 respectively; The programmable controller controls the on and off of each relay through a digital output port, thereby controlling the operation of each switching power supply; The switching power supply 1 provides power for the backlighting of each meter under test.

4. The intelligent detection circuit according to claim 1, wherein: The programmable controller controls the output of the switching power supplies 2-4 respectively through the analog output ports; The output end of the switching power supply 2 is connected to the measuring end of the AC network voltage meter under test; The output end of the switching power supply 3 is connected to the measuring end of the auxiliary pressure meter under test; The output end of the switching power supply 4 is connected to the input end of the high-voltage DC converter under test; The programmable controller also collects the output voltage of the high-voltage direct current converter through an analog input port; The programmable controller also directly provides a test voltage to the DC network voltage meter under test through an analog output port.

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