Live-line state display device for rail transit overhead line system

Abstract

The utility model provides a live state display device for a rail transit overhead line system, which belongs to the technical field of rail transit electricity testing and comprises a case. The first high-voltage fuse, the first direct-current current transmitter, the first I / V converter, the first signal amplifier, the first signal isolator, the second high-voltage fuse, the second direct-current current transmitter, the second I / V converter, the second signal amplifier, the second signal isolator, the A / D converter, the microprocessor, the display and the red / green double-color indicator lamp are located in the case. And a yellow indicating lamp and a dot-matrix LED screen. According to the utility model, the simple operation of the detection device is realized, the potential safety hazard is thoroughly eliminated, and the operation time is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transit electricity testing, in particular to a rail transit contact network live state display device. Background Art

[0002] Nowadays, many subway vehicle depots and parking lots still use the traditional method of residual voltage testing for traction networks: manual testing is performed using a DC tester, which consists of a DC measuring device and an operating rod. A high-voltage current limiting element and a grounding lead-in port are added to the first section of the insulating rod, and the terminal has positive and negative poles. Before the test, the tester should be self-checked to ensure that the tester functions properly. During the test, it is also necessary to check whether the grounding lead-in is intact and whether the contact point is reliable.

[0003] The order of electrical testing operations is:

[0004] (1) Clamp the grounding lead securely to a good grounding rail or grounding electrode;

[0005] (2) Insert the plug at the upper end of the grounding lead securely into the socket at the end of the first section of the rod;

[0006] (3) Turn on the electrical test indicator and perform a self-test;

[0007] (4) Stretch all insulating operating rods until they are fully extended and positioned;

[0008] (5) The operator should first test the electricity at the energized part of the tester to prove that the performance of the tester is intact, and then test the electricity at the construction site to confirm whether the construction site has electricity. Finally, the operator should return to the energized part for retesting to ensure the integrity of the tester.

[0009] The main problems and defects of DC electroscopes are as follows: a. To ensure the safety of people and equipment, electroscopes must be subject to regular preventive tests every six months as required;

[0010] b. The electrical testing process is cumbersome, time-consuming and labor-intensive, which is a waste of time for maintenance work, increases manpower waste and leaves safety hazards during the electrical testing process. Utility Model Content

[0011] In response to the above-mentioned deficiencies in the prior art, the present invention provides a rail transit contact network live status display device, which solves the problems of the prior art detection device being cumbersome to operate, taking a long time to operate, and being unable to completely eliminate safety hazards.

[0012] In order to achieve the above objectives, the technical solution adopted by the utility model is: a rail transit contact network live status display device, the display device is connected to the traction power grid, including: a chassis, and a first high-voltage fuse, a first DC current transmitter, a first I / V converter, a first signal amplifier, a first signal isolator, and a second high-voltage fuse, a second DC current transmitter, a second I / V converter, a second signal amplifier, a second signal isolator, and a first signal isolator, a second signal isolator and a microprocessor all connected to the A / D converter, as well as a display, a red / green two-color indicator light, a yellow indicator light and a dot matrix LED screen all connected to the microprocessor; wherein, the traction power grid is respectively connected to the first high-voltage fuse and the second high-voltage fuse.

[0013] The beneficial effects of the present invention are as follows: the present invention is electrically connected to the traction power grid through a power cable, realizes automatic detection and automatic display within the range of the traction power supply voltage, sets a safe residual voltage value according to industry standards, realizes automatic alarm, and does not require manual operation.

[0014] Furthermore, the microprocessor is connected to the display via RS485; the microprocessor is connected to the red / green dual-color indicator light via a first power drive circuit; the microprocessor is connected to the yellow indicator light via a second power drive circuit; and the microprocessor is connected to the dot matrix LED screen via a third power drive circuit.

[0015] Furthermore, the microprocessor includes a control chip U10;

[0016] The PC13 pin of the control chip U10, the PC14 pin of the control chip U10, and the PC15 pin of the control chip U10 are all connected to the A / D converter; the PA2 pin of the control chip U10 and the PA3 pin of the control chip U10 are both connected to RS485; the 29th pin of the control chip U10 is connected to the second power drive circuit; the 30th pin of the control chip U10 and the 31st pin of the control chip U10 are both connected to the first power drive circuit; the 32nd pin of the control chip U10 and the 33rd pin of the control chip U10 are both connected to the third power drive circuit.

[0017] Furthermore, the first I / V converter includes: a resistor R10 and a resistor R11;

[0018] One end of the resistor R10 is connected to the first signal amplifier and the first DC current transmitter respectively; one end of the resistor R11 is connected to the first signal amplifier and the first DC current transmitter respectively; the other end of the resistor R10 is connected to the other end of the resistor R11;

[0019] The first signal amplifier includes: an operational amplifier U1A, a resistor R12, a resistor R13, a resistor R14, a resistor R55, a capacitor C1, and a capacitor C2;

[0020] The output end of the operational amplifier U1A is respectively connected to one end of the resistor R14 and the first signal isolator; the inverting input end of the operational amplifier U1A is respectively connected to one end of the resistor R13 and the other end of the resistor R14; the non-inverting input end of the operational amplifier U1A is respectively connected to one end of the resistor R12 and one end of the resistor R55; the positive power input end of the operational amplifier U1A is connected to one end of the capacitor C1 and is connected to the +5BV power signal; the negative power input end of the operational amplifier U1A is grounded; the other end of the capacitor C1 is connected to the other end of the resistor R55 and is also grounded; the other end of the resistor R12 is respectively connected to one end of the capacitor C2, one end of the resistor R10 and the first DC current transmitter; the other end of the resistor R13 is respectively connected to the other end of the capacitor C2, one end of the resistor R11 and the first DC current transmitter;

[0021] The first signal isolator includes an optical coupler U5;

[0022] The first pin of the optocoupler U5 is connected to one end of the resistor R19; the second pin of the optocoupler U5 is connected to the +5BV power supply signal; the third pin of the optocoupler U5 is respectively connected to the inverting input terminal of the operational amplifier U1D, one end of the capacitor C11, one end of the resistor R15 and the grounded capacitor C9; the fourth pin of the optocoupler U5 is grounded; the fifth pin of the optocoupler U5 is connected to the non-inverting input terminal of the operational amplifier U2A and grounded; the sixth pin of the optocoupler U5 is respectively connected to the inverting input terminal of the operational amplifier U2A, one end of the resistor R16 and one end of the capacitor C8; the output terminal of the operational amplifier U1D is respectively connected to the other end of the resistor R19 and the other end of the capacitor C11; the operational amplifier U1D The non-inverting input terminal of the operational amplifier U1A is grounded; the other end of the resistor R15 is connected to the output terminal of the operational amplifier U1A; the output terminal of the operational amplifier U2A is respectively connected to one end of the resistor R21, one end of the resistor R59 and the other end of the capacitor C8; the positive power input terminal of the operational amplifier U2A is connected to the grounded capacitor C5 and connected to the +5V power signal; the negative power input terminal of the operational amplifier U2A is grounded; the other end of the resistor R16 is connected to the other end of the resistor R59; the other end of the resistor R21 is respectively connected to one end of the resistor R30, one end of the capacitor C26, the positive electrode of the polarized capacitor EC3 and the A / D converter; the other end of the resistor R30 is respectively connected to the other end of the capacitor C26 and the negative electrode of the polarized capacitor EC3 and grounded.

[0023] Furthermore, the second I / V converter includes: a resistor R77 and a resistor R78;

[0024] One end of the resistor R77 is connected to the second signal amplifier and the second DC current transmitter respectively; one end of the resistor R78 is connected to the second signal amplifier and the second DC current transmitter respectively; the other end of the resistor R77 is connected to the other end of the resistor R78;

[0025] The second signal amplifier includes: an operational amplifier U1B, a resistor R39, a resistor R40, a resistor R41, a resistor R42 and a capacitor C3;

[0026] The output end of the operational amplifier U1B is respectively connected to one end of the resistor R41 and the second signal isolator; the non-inverting input end of the operational amplifier U1B is respectively connected to one end of the resistor R39 and one end of the resistor R42; the inverting input end of the operational amplifier U1B is respectively connected to the other end of the resistor R41 and one end of the resistor R40; the other end of the resistor R42 is grounded; the other end of the resistor R39 is respectively connected to one end of the capacitor C3, one end of the resistor R77, and the second DC current transmitter; the other end of the resistor R40 is respectively connected to the other end of the capacitor C3, one end of the resistor R78, and the second DC current transmitter;

[0027] The second signal isolator includes an optical coupler U6;

[0028] The first pin of the optical coupler U6 is connected to one end of the resistor R20; the second pin of the optical coupler U6 is connected to the +5BV power signal; the third pin of the optical coupler U6 is respectively connected to the inverting input terminal of the operational amplifier U1C, one end of the capacitor C12, one end of the resistor R17 and the grounded capacitor C4; the fourth pin of the optical coupler U6 is grounded; the fifth pin of the optical coupler U6 is connected to the non-inverting input terminal of the operational amplifier U2B and is connected to the +5BV power signal; the sixth pin of the optical coupler U6 is respectively connected to the inverting input terminal of the operational amplifier U2B, one end of the resistor R18 and one end of the capacitor C17; the output terminal of the operational amplifier U1C is respectively connected to the +5BV power signal. The other end of the resistor R20 is connected to the other end of the capacitor C12; the non-inverting input end of the operational amplifier U1C is grounded; the other end of the resistor R17 is connected to the output end of the operational amplifier U1B; the output end of the operational amplifier U2B is respectively connected to one end of the resistor R22, one end of the resistor R60 and the other end of the capacitor C17; the other end of the resistor R18 is connected to the other end of the resistor R60; the other end of the resistor R22 is respectively connected to one end of the resistor R53, one end of the capacitor C27, the positive electrode of the polarized capacitor EC7 and the A / D converter; the other end of the resistor R53 is respectively connected to the other end of the capacitor C27 and the negative electrode of the polarized capacitor EC7 and grounded.

[0029] Furthermore, the A / D converter includes a chip U14;

[0030] The IN0 pin of the chip U14 is connected to the positive pole of the polarized capacitor EC3; the IN1 pin of the chip U14 is connected to the positive pole of the polarized capacitor EC7; the 12th pin of the chip U14 is connected to the PC15 pin of the control chip U10; the 13th pin of the chip U14 is connected to the PC14 pin of the control chip U10; the 14th pin of the chip U14 is connected to the PC13 pin of the control chip U10.

[0031] Furthermore, the RS458 includes a chip U13;

[0032] The 7th pin of the chip U13 is respectively connected to the 1st pin of the display connector XS2, one end of the bidirectional voltage regulator diode D13, one end of the bidirectional voltage regulator diode D14, one end of the resistor R50 and one end of the resistor R51; the 6th pin of the chip U13 is respectively connected to the 2nd pin of the display connector XS2, the other end of the bidirectional voltage regulator diode D13, one end of the bidirectional voltage regulator diode D15, the other end of the resistor R50 and one end of the resistor R52; the other end of the resistor R52 is connected to the +5AV power signal; the bidirectional voltage regulator diode D The other end of 14 is connected to the other end of the resistor R51 and grounded; the other end of the bidirectional voltage regulator diode D15 is grounded; the RO pin of the chip U13 is connected to the 7th pin of the chip U12; the RE pin of the chip U13 is respectively connected to the DE pin of the chip U13 and the 4th pin of the chip U9; the DI pin of the chip U13 is connected to the 6th pin of the chip U12; the VoA pin of the chip U12 is connected to the PA2 pin of the control chip U10; the ViB pin of the chip U12 is connected to the PA3 pin of the control chip U10.

[0033] Furthermore, the red / green indicator light connector includes a connector XS5; pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7, pin 8, pin 9, pin 10, pin 11, and pin 12 of the connector XS5 are all connected to the first power drive circuit;

[0034] The dot matrix LED screen includes a connector XS4; pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7, pin 8, pin 9, pin 10, pin 11 and pin 12 of the connector XS4 are all connected to the third power driving circuit.

[0035] Furthermore, the first power driving circuit includes: an optical coupler U24 and an optical coupler U25;

[0036] The first pin of the optocoupler U24 is connected to one end of the resistor R37; the other end of the resistor R37 is connected to the 30th pin of the control chip U10; the second pin of the optocoupler U24 is grounded; the third pin of the optocoupler U24 is connected to a 0V power signal; the fourth pin of the optocoupler U24 is connected to the 12th pin of the relay K3; the fourth pin of the relay K3 is connected to the 7th pin of the connector XS5; the ninth pin of the relay K3 is connected to the 8th pin of the connector XS5; the 10th pin of the relay K3 is connected to the 9th pin of the connector XS5; the 8th pin of the relay K3 is connected to the 10th pin of the connector XS5; the third pin of the relay K3 is connected to the 11th pin of the connector XS5; and the fifth pin of the relay K3 is connected to the 12th pin of the connector XS5.

[0037] The first pin of the optocoupler U25 is connected to one end of the resistor R38; the other end of the resistor R38 is connected to the 31st pin of the control chip U10; the second pin of the optocoupler U25 is grounded; the third pin of the optocoupler U25 is connected to a 0V power signal; the fourth pin of the optocoupler U25 is connected to the 12th pin of the relay K4; the fourth pin of the relay K4 is connected to the first pin of the connector XS5; the ninth pin of the relay K4 is connected to the second pin of the connector XS5; the tenth pin of the relay K4 is connected to the third pin of the connector XS5; the eighth pin of the relay K4 is connected to the fourth pin of the connector XS5; the third pin of the relay K4 is connected to the fifth pin of the connector XS5; and the fifth pin of the relay K4 is connected to the sixth pin of the connector XS5.

[0038] The second power driving circuit includes: a chip U16 and an optical coupler U26;

[0039] Pin 5 of the chip U16 is respectively connected to pin 6 of the chip U16, pin 7 of the chip U16, pin 8 of the chip U16 and pin 1 of the yellow indicator light connector XS7; pin 3 of the yellow indicator light connector XS7 is connected to a 0V power supply signal; pin 1 of the optocoupler U26 is connected to one end of the resistor R73; the other end of the resistor R73 is connected to pin 29 of the control chip U10.

[0040] Furthermore, the third power driving circuit includes: an optical coupler U22 and an optical coupler U23;

[0041] The first pin of the optocoupler U22 is connected to one end of the resistor R27; the other end of the resistor R27 is connected to the 33rd pin of the control chip U10; the second pin of the optocoupler U22 is grounded; the third pin of the optocoupler U22 is connected to a 0V power signal; the fourth pin of the optocoupler U22 is connected to the 12th pin of the relay K1; the fourth pin of the relay K1 is connected to the first pin of the connector XS4; the ninth pin of the relay K1 is connected to the second pin of the connector XS4; the tenth pin of the relay K1 is connected to the third pin of the connector XS4; the eighth pin of the relay K1 is connected to the fourth pin of the connector XS4; the third pin of the relay K1 is connected to the fifth pin of the connector XS4; and the fifth pin of the relay K1 is connected to the sixth pin of the connector XS4.

[0042] The first pin of the optocoupler U23 is connected to one end of the resistor R35; the other end of the resistor R35 is connected to the 32nd pin of the control chip U10; the second pin of the optocoupler U23 is grounded; the third pin of the optocoupler U23 is connected to a 0V power supply signal; the fourth pin of the optocoupler U23 is connected to the 12th pin of the relay K2; the fourth pin of the relay K2 is connected to the 7th pin of the connector XS4; the 9th pin of the relay K2 is connected to the 8th pin of the connector XS4; the 10th pin of the relay K2 is connected to the 9th pin of the connector XS4; the 8th pin of the relay K2 is connected to the 10th pin of the connector XS4; the 3rd pin of the relay K2 is connected to the 11th pin of the connector XS4; and the 5th pin of the relay K2 is connected to the 12th pin of the connector XS4.

[0043] The beneficial effects of the above-mentioned further scheme are as follows: the utility model integrates voltage conversion, isolation and measurement, realizes the convenient setting of the safety residual pressure safety threshold, computer-controlled voltage value calculation and process, and online installation and operation are simple; the utility model uses a DC current transmitter to perform differential mode voltage division on the traction network voltage through a resistor to output a safe voltage, thereby improving the safety of the electrical testing device; the utility model integrates an A / D converter with a microprocessor to improve the anti-interference and reliability of signal processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a structural diagram of the utility model.

[0045] Figure 2 4 is a circuit diagram of the microprocessor in this embodiment.

[0046] Figure 3 FIG. 4 is a circuit schematic diagram of the first I / V converter and the first signal amplifier in this embodiment.

[0047] Figure 4 2 is a circuit schematic diagram of the first signal isolator in this embodiment.

[0048] Figure 5 is a circuit schematic diagram of the second I / V converter and the second signal amplifier in this embodiment.

[0049] Figure 6 2 is a circuit schematic diagram of the second signal isolator in this embodiment.

[0050] Figure 7 4 is a circuit diagram of the A / D converter in this embodiment.

[0051] Figure 8 This is the circuit schematic diagram of RS485 and display in this embodiment.

[0052] Figure 9 : is the circuit principle diagram of the red / green indicator light connector in this embodiment.

[0053] Figure 10 This is a circuit schematic diagram of the dot matrix LED screen connector in this embodiment.

[0054] Figure 11 FIG. 4 is a circuit schematic diagram of the first power driving circuit in this embodiment.

[0055] Figure 12 FIG. 4 is a circuit schematic diagram of the second power driving circuit in this embodiment.

[0056] Figure 13 FIG. 4 is a circuit schematic diagram of the third power driving circuit in this embodiment.

[0057] Among them, 1. the first high-voltage fuse, 2. the first DC current transmitter, 3. the first I / V converter, 4. the first signal amplifier, 5. the first signal isolator, 6. the second high-voltage fuse, 7. the second DC current transmitter, 8. the second I / V converter, 9. the second signal amplifier, 10. the second signal isolator, 11. the A / D converter, 12. the single-chip microcomputer, 13. the RS485, 14. the 4-digit digital display, 15. the first power drive circuit, 16. the red / green two-color indicator light, 17. the second power drive circuit, 18. the yellow indicator light, 19. the third power drive circuit, 20. the dot matrix LED screen. DETAILED DESCRIPTION

[0058] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.

[0059] Example

[0060] like Figure 1 As shown, the utility model provides a rail transit contact network live state display device, which is connected to the traction power grid and includes: a chassis, and a first high-voltage fuse 1, a first DC current transmitter 2, a first I / V converter 3, a first signal amplifier 4, a first signal isolator 5, a second high-voltage fuse 6, a second DC current transmitter 7, a second I / V converter 8, a second signal amplifier 9, a second signal isolator 10, an A / D converter 11, a microprocessor 12, a display 14, a red / green two-color indicator light 16, a yellow indicator light 18, and a dot matrix LED screen 20 located inside the chassis;

[0061] The first high-voltage fuse 1, the first DC current transmitter 2, the first I / V converter 3, the first signal amplifier 4 and the first signal isolator 5 are electrically connected in sequence; the second high-voltage fuse 6, the second DC current transmitter 7, the second I / V converter 8, the second signal amplifier 9 and the second signal isolator 10 are electrically connected in sequence;

[0062] The traction grid is connected to the first high-voltage fuse 1 and the second high-voltage fuse 6 respectively; the A / D converter 11 is connected to the first signal isolator 5, the second signal isolator 10 and the microprocessor 12 respectively; the microprocessor 12 is connected to the display 14, the red / green two-color indicator light 16, the yellow indicator light 18 and the dot matrix LED screen 20 respectively.

[0063] In this embodiment, one end of the first high-voltage fuse is connected to the contact rail 1500VDC in the traction grid; the other end of the first high-voltage fuse is connected to the first DC current transmitter, and the first DC current transmitter is connected to the running rail 0VDC in the traction grid; one end of the second high-voltage fuse is connected to the contact rail 1500VDC in the traction grid; the other end of the second high-voltage fuse is connected to the second DC current transmitter, and the second DC current transmitter is connected to the running rail 0VDC in the traction grid; the normal operation of the circuit is achieved to prevent excessive voltage from damaging the circuit.

[0064] In this embodiment, the physical quantity measured by the rail transit contact network live status display device is a voltage value. The traction voltage is converted into a signal current through a DC current transmitter. The principle is that the traction voltage is input into the transmitter input terminal, and the voltage divider circuit inside the transmitter divides the traction voltage DC0~2000V to a safe voltage of DCO~5V. The contact network is electrically isolated from the live status display device through a differential amplifier and an analog photoelectric isolator to resolve the safety hazards of equipment and operators. In order to eliminate the safety hazards of equipment and operators, the traction grid and the live status display device are electrically isolated through an analog photoelectric isolator.

[0065] In this embodiment, the signal amplifier uses the LMV324-SR linear signal amplifier, and the signal isolator uses the HCNR201, a high-performance, high-electrical-isolation analog optoelectronic isolator; the A / D converter is integrated with the microprocessor to improve the anti-interference and reliability of signal processing, and the A / D converter uses an integrated 12-bit A / D converter; the microprocessor uses an ARM-MO single-chip microcomputer.

[0066] In this embodiment, the operating environment of the rail transit contact network live state display device is harsh and has strong interference, so V out Converted into 4~20mA current I out Output, I out It is connected to the detection device by a wire, and power amplification and isolation are performed through an I / V converter. The input signal is converted into a digital signal through an A / D converter. The measurement steps and calculation methods are program software.

[0067] The microprocessor 12 is connected to the display 14 via RS485 communication 13; the microprocessor 12 is connected to the red / green dual-color indicator light 16 via a first power drive circuit 15; the microprocessor 12 is connected to the yellow indicator light 18 via a second power drive circuit 17; the microprocessor 12 is connected to the dot matrix LED screen 20 via a third power drive circuit 19.

[0068] In this embodiment, the first power driving circuit 15 and the third power driving circuit 19 are the same power driving circuits mainly including two optocouplers and relays connected to the optocouplers, and the second power driving circuit 17 mainly includes a chip U16 and an optocoupler U26.

[0069] In this embodiment, the display 14 is connected to the microprocessor 12 via RS485 communication 13. The display 14 uses a 4-digit digital display screen to display the voltage value of the traction network in real time. A red / green dual-color indicator light 16 and a yellow indicator light are installed on the front panel of the device. The red / green dual-color indicator light 16 is connected to the microprocessor 12 through a first power drive circuit 15, and the microprocessor 12 is connected to the dot matrix LED screen 20 through a third power drive circuit 19. The microprocessor 12 transfers the digital electrical signal to the display 14 in a communication manner, directly displaying the voltage value of the traction power grid, which is compared with the residual pressure safety threshold value. The red / green dual-color indicator light 16 displays safety or alarm through different colors. If the measured voltage value of the traction network is an abnormal value, the yellow indicator light flashes to alarm, and at the same time, the signal is amplified by the drive circuit and output through the device terminal to drive the background computer or display device. An 8-bit DIP switch is connected to the input pin of the microprocessor 12. The state of each bit of the DIP switch read by the microprocessor 12 corresponds to a residual voltage safety threshold value, which has a range of 400-1000V (step size 100V) and a total of 7 gears (the default value is 600V, and the residual voltage is lower than 60% of the rated voltage as a safety value). During normal operation, the traction network voltage value is higher than 1000V. It is only confirmed as a residual voltage value when the traction network voltage is lower than 1000V.

[0070] When the residual voltage value of the traction network is higher than the safety voltage, the red / green dual-color indicator light 16 displays red, and the dot-matrix LED screen 20 displays "power on" in red Chinese characters; when the residual voltage value of the traction network is lower than the safety voltage, the red / green dual-color indicator light 16 displays green, and the dot-matrix LED screen 20 displays "no power" in green Chinese characters. The yellow indicator light 18 is connected to the microprocessor 12 through the second power drive circuit 17. When the voltage input signal of the equipment fails, the yellow indicator light flashes, and the dot-matrix LED screen 20 displays "fault" in yellow Chinese characters. When the traction network voltage value is higher than the residual voltage safety value and the equipment fails at the same time, the dot-matrix LED screen 20 displays "power on" in red Chinese characters. Only when the residual voltage of the traction network is lower than the safety threshold value is the grounding switch allowed to be grounded, and maintenance work can be carried out after the grounding switch is grounded.

[0071] When the voltage of the traction grid changes, the input voltage connected to the DC current transmitter 2 changes. After differential mode resistor voltage division, isolation and I / V conversion by the I / V converter 3, a current signal proportional to the voltage is output. This signal is input to the detection equipment through a wire, and after I / V conversion, amplification, A / D conversion and microprocessing, the corresponding traction grid voltage value is displayed on the display.

[0072] like Figure 2As shown, the microprocessor 12 includes: a control chip U10, a program downloader XS6, a resistor 46, a grounding resistor R23, a grounding resistor R80, a capacitor C13, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C21, a capacitor C46, ​​a grounding capacitor C34 and a crystal oscillator CR1;

[0073] The PC13 pin of the control chip U10, the PC14 pin of the control chip U10 and the PC15 pin of the control chip U10 are all connected to the A / D converter 11 to realize the input and output of the serial port connection; the PA2 pin of the control chip U10 and the PA3 pin of the control chip U10 are both connected to the RS485 communication 13 to realize the input and output of data; the 29th pin of the control chip U10 is connected to the second power drive circuit 17 to correctly transmit the data of the control chip U10 to the display light; the 30th pin of the control chip U10 and the 31st pin of the control chip U10 are both connected to the first power drive circuit 15 to correctly transmit the data of the control chip U10 to the red / green two-color indicator light 16 and provide correct circuit signals; the 32nd pin of the control chip U10 and the 33rd pin of the control chip U10 are both connected to the third power drive circuit 19 to correctly display the data of the control chip U10 on the dot matrix LED screen 20.The 34th pin of the control chip U10 is connected to the 3rd pin of the program downloader XS6 to provide program data download for the control chip; the 35th pin of the control chip U10 is connected to one end of the capacitor C46 and is grounded; the 36th pin of the control chip U10 is connected to the other end of the capacitor C46 and is connected to the +3.3V power signal; the 37th pin of the control chip U10 is connected to the 2nd pin of the program downloader XS6, acting on the program download clock engine; the 1st pin of the program downloader XS6 is connected to the +3.3V power signal; the 4th pin of the program downloader XS6 is grounded; the 44th pin of the control chip U10 is connected to the grounding resistor R23 for program startup boot; the 47th pin of the control chip U10 is grounded; the 48th pin of the control chip U10 is respectively connected to the VBAT pin of the control chip U10 and the grounding capacitor C34 and is connected to the +3.3V power signal; the PD0 pin of the control chip U10 is respectively connected to one end of the capacitor C18 and one end of the crystal oscillator CR1 for the controller system Oscillation input; the PD1 pin of the control chip U10 is connected to one end of the capacitor C19 and the other end of the crystal oscillator CR1 respectively, for controlling the oscillation of the controller system; the other end of the capacitor C18 is connected to the other end of the capacitor C19 and grounded; the NRST pin of the control chip U10 is connected to one end of the resistor R46 and one end of the capacitor C13 respectively, for resetting the controller; the other end of the resistor R46 is connected to the +3.3V power supply signal; the VSS_1 pin of the control chip U10 is grounded; the control chip The VDD_1 pin of the chip U10 is connected to one end of the capacitor C20 and connected to the +3.3V power supply signal to provide chip voltage; the other end of the capacitor C13 is connected to the other end of the capacitor C20 and is grounded; the PB2 pin of the control chip U10 is connected to one end of the grounding resistor R80 to guide the program startup; the VSS_2 pin of the control chip U10 is connected to one end of the capacitor C21 and connected to the +3.3V power supply signal; the VDD_2 pin of the control chip U10 is connected to the other end of the capacitor C21 and is grounded.

[0074] like Figure 3 As shown, the first I / V converter 3 includes: a resistor R10 and a resistor R11; the first DC current transmitter 2 includes a connector XS1;

[0075] One end of the resistor R10 is connected to the first signal amplifier 4 and the first pin of the connector XS1 respectively; one end of the resistor R11 is connected to the first signal amplifier 4 and the second pin of the connector XS1 respectively; the other end of the resistor R10 is connected to the other end of the resistor R11;

[0076] The first signal amplifier 4 includes: an operational amplifier U1A, a resistor R12, a resistor R13, a resistor R14, a resistor R55, a capacitor C1 and a capacitor C2;

[0077] The output end of the operational amplifier U1A is respectively connected to one end of the resistor R14 and the first signal isolator to filter the output signal; the inverting input end of the operational amplifier U1A is respectively connected to one end of the resistor R13 and the other end of the resistor R14; the non-inverting input end of the operational amplifier U1A is respectively connected to one end of the resistor R12 and one end of the resistor R55; the positive power input end of the operational amplifier U1A is connected to one end of the capacitor C1 and connected to the +5BV power signal; the negative power input end of the operational amplifier U1A is grounded; the other end of the capacitor C1 is connected to the other end of the resistor R55 and is grounded; the other end of the resistor R12 is respectively connected to one end of the capacitor C2, one end of the resistor R10 and the first pin of the connector XS1; the other end of the resistor R13 is respectively connected to the other end of the capacitor C2, one end of the resistor R11 and the second pin of the connector XS1 to amplify the input signal.

[0078] like Figure 4 As shown, the first signal isolator 5 includes an optical coupler U5;

[0079] The first pin of the optocoupler U5 is connected to one end of the resistor R19; the second pin of the optocoupler U5 is connected to the +5BV power supply signal; the third pin of the optocoupler U5 is respectively connected to the inverting input terminal of the operational amplifier U1D, one end of the capacitor C11, one end of the resistor R15 and the grounded capacitor C9; the fourth pin of the optocoupler U5 is grounded; the fifth pin of the optocoupler U5 is connected to the non-inverting input terminal of the operational amplifier U2A and grounded; the sixth pin of the optocoupler U5 is respectively connected to the inverting input terminal of the operational amplifier U2A, one end of the resistor R16 and one end of the capacitor C8; the output terminal of the operational amplifier U1D is respectively connected to the other end of the resistor R19 and the other end of the capacitor C11; The non-inverting input terminal is grounded; the other end of the resistor R15 is connected to the output terminal of the operational amplifier U1A; the output terminal of the operational amplifier U2A is respectively connected to one end of the resistor R21, one end of the resistor R59 and the other end of the capacitor C8; the positive power input terminal of the operational amplifier U2A is connected to the grounded capacitor C5 and connected to the +5V power signal; the negative power input terminal of the operational amplifier U2A is grounded; the other end of the resistor R16 is connected to the other end of the resistor R59; the other end of the resistor R21 is respectively connected to one end of the resistor R30, one end of the capacitor C26, the positive electrode of the polarized capacitor EC3 and the A / D converter 11; the other end of the resistor R30 is respectively connected to the other end of the capacitor C26 and the negative electrode of the polarized capacitor EC3 and grounded.

[0080] like Figure 5 As shown, the second I / V converter 8 includes: a resistor R77 and a resistor R78; the second DC current transmitter 7 includes a connector XS3;

[0081] One end of the resistor R77 is connected to the second signal amplifier 9 and the first pin of the connector XS3 respectively; one end of the resistor R78 is connected to the second signal amplifier 9 and the second pin of the connector XS3 respectively; the other end of the resistor R77 is connected to the other end of the resistor R78;

[0082] The second signal amplifier 9 includes: an operational amplifier U1B, a resistor R39, a resistor R40, a resistor R41, a resistor R42 and a capacitor C3;

[0083] The output end of the operational amplifier U1B is respectively connected to one end of the resistor R41 and the second signal isolator 10 to filter the output signal; the non-inverting input end of the operational amplifier U1B is respectively connected to one end of the resistor R39 and one end of the resistor R42; the inverting input end of the operational amplifier U1B is respectively connected to the other end of the resistor R41 and one end of the resistor R40; the other end of the resistor R42 is grounded; the other end of the resistor R39 is respectively connected to one end of the capacitor C3, one end of the resistor R77 and the first pin of the connector XS3; the other end of the resistor R40 is respectively connected to the other end of the capacitor C3, one end of the resistor R78 and the second pin of the connector XS3 to amplify the input signal.

[0084] like Figure 6 As shown, the second signal isolator 10 includes an optical coupler U6;

[0085] The first pin of the optical coupler U6 is connected to one end of the resistor R20; the second pin of the optical coupler U6 is connected to the +5BV power signal; the third pin of the optical coupler U6 is respectively connected to the inverting input terminal of the operational amplifier U1C, one end of the capacitor C12, one end of the resistor R17 and the grounding capacitor C4; the fourth pin of the optical coupler U6 is grounded; the fifth pin of the optical coupler U6 is connected to the non-inverting input terminal of the operational amplifier U2B and is connected to the +5BV power signal; the sixth pin of the optical coupler U6 is respectively connected to the inverting input terminal of the operational amplifier U2B, one end of the resistor R18 and one end of the capacitor C17; the output terminal of the operational amplifier U1C is respectively connected to the resistor R18 and one end of the capacitor C17. The other end of R20 is connected to the other end of capacitor C12; the non-inverting input end of the operational amplifier U1C is grounded; the other end of the resistor R17 is connected to the output end of the operational amplifier U1B; the output end of the operational amplifier U2B is respectively connected to one end of the resistor R22, one end of the resistor R60 and the other end of the capacitor C17; the other end of the resistor R18 is connected to the other end of the resistor R60; the other end of the resistor R22 is respectively connected to one end of the resistor R53, one end of the capacitor C27, the positive electrode of the polarized capacitor EC7 and the A / D converter 11; the other end of the resistor R53 is respectively connected to the other end of the capacitor C27 and the negative electrode of the polarized capacitor EC7 and grounded.

[0086] like Figure 7As shown, the A / D converter 11 includes a chip U14; the IN0 pin of the chip U14 is respectively connected to the positive electrode of the polarized capacitor EC3, one end of the capacitor C26, one end of the resistor R30 and the other end of the resistor R21; the IN1 pin of the chip U14 is respectively connected to the positive electrode of the polarized capacitor EC7, one end of the capacitor C27, one end of the resistor R53 and the other end of the resistor R22; the 12th pin of the chip U14 is connected to the PC15 pin of the control chip U10 for synchronous serial port input; the 13th pin of the chip U14 is connected to the PC14 pin of the control chip U10 for clock output; the 14th pin of the chip U14 is connected to the PC13 pin of the control chip U10 for synchronous serial port output; the IN2 pin of the chip U14 is respectively connected to the PC15 pin of the control chip U10 for synchronous serial port input. One end of the resistor R24, the INPUT pin of the chip U15 and one end of the capacitor C36 are connected; the other end of the resistor R24 ​​is connected to the +3.3V power supply signal; the GND pin of the chip U15 is connected to the other end of the capacitor C36 and is grounded; the REF pin of the chip U14 is respectively connected to the REFIN pin of the chip U14, the 1st pin of the chip U14, the 15th pin of the chip U14 and the 20th pin of the chip U14 and are connected to the +3.3V power supply voltage; the IN3 pin of the chip U14 is respectively connected to the IN4 pin of the chip U14, the IN5 pin of the chip U14, the IN6 pin of the chip U14, the IN7 pin of the chip U14 and the COM pin of the chip U14 and are grounded; the 4th pin of the chip U14 is connected to the 5th pin of the chip U14 and is grounded.

[0087] like Figure 8 As shown, the microprocessor 12 is connected to the display 14 via RS485 communication 13; the RS485 communication 13 includes: chip U9, chip U12 and chip U13;

[0088] The 7th pin of the chip U13 is respectively connected to the 1st pin of the connector XS2 of the display 14, one end of the bidirectional voltage regulator diode D13, one end of the bidirectional voltage regulator diode D14, one end of the resistor R50, and one end of the resistor R51; the 6th pin of the chip U13 is respectively connected to the 2nd pin of the connector XS2 of the display 14, the other end of the bidirectional voltage regulator diode D13, one end of the bidirectional voltage regulator diode D15, the other end of the resistor R50, and one end of the resistor R52; the other end of the resistor R52 is connected to the +5AV power signal; The other end of the bidirectional voltage regulator diode D14 is connected to the other end of the resistor R51 and is grounded; the other end of the bidirectional voltage regulator diode D15 is grounded; the 5th pin of the chip U13 is grounded; the 8th pin of the chip U13 is connected to one end of the capacitor C51 and is connected to the +5AV power supply voltage; the other end of the capacitor C51 is grounded; the RO pin of the chip U13 is connected to the 7th pin of the chip U12; the RE pin of the chip U13 is respectively connected to the DE pin of the chip U13 and the 4th pin of the chip U9; the The DI pin is connected to the 6th pin of the chip U12 and one end of the resistor R44 respectively; the 5th pin of the chip U9 is connected to the +5AV power signal; the A pin of the chip U9 is connected to the B pin of the chip U9, one end of the resistor R45, one end of the capacitor C31 and the emitter of the transistor VD4 respectively; the GND pin of the chip U9 is connected to the other end of the capacitor C31 and the collector of the transistor VD4 and grounded; the other end of the resistor R45 is connected to the +5AV power signal; the base of the transistor VD4 is connected to the resistor R4 4; the 5th pin of the chip U12 is grounded; the 8th pin of the chip U12 is connected to the grounding capacitor C23 and connected to the +5AV power signal; the VDD1 pin of the chip U12 is connected to the grounding capacitor C22 and connected to the +3.3V power signal; the GND1 pin of the chip U12 is grounded; the VoA pin of the chip U12 is connected to the PA2 pin of the control chip U10 for asynchronous serial port input; the ViB pin of the chip U12 is connected to the PA3 pin of the control chip U10 for asynchronous serial port output.

[0089] like Figure 9 and Figure 10 As shown, the red / green indicator light connector 16 includes a connector XS5;

[0090] Pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7, pin 8, pin 9, pin 10, pin 11 and pin 12 of the connector XS5 are all connected to the first power driving circuit 15;

[0091] The dot matrix LED screen includes a connector XS4;

[0092] Pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7, pin 8, pin 9, pin 10, pin 11 and pin 12 of the connector XS4 are all connected to the third power driving circuit 19 .

[0093] like Figure 11 As shown, the first power driving circuit includes: an optical coupler U24, an optical coupler U25, a relay K3, a relay K4, a resistor R33, a resistor R34, a resistor R37, a resistor R38, a diode D11, a diode D12, a light emitting diode D4 and a light emitting diode D5;

[0094] The first pin of the optical coupler U24 is connected to one end of the resistor R37; the other end of the resistor R37 is connected to the 30th pin of the control chip U10 to start or stop the red / green indicator light on the panel; the second pin of the optical coupler U24 is grounded; the third pin of the optical coupler U24 is connected to a 0V power supply signal; the fourth pin of the optical coupler U24 is respectively connected to the 12th pin of the relay K3, the positive electrode of the diode D11 and the negative electrode of the light-emitting diode D4; the fourth pin of the relay K3 is connected to the 7th pin of the connector XS5; the relay K3 The 9th pin of the relay K3 is connected to the 8th pin of the connector XS5; the 10th pin of the relay K3 is connected to the 9th pin of the connector XS5; the 8th pin of the relay K3 is connected to the 10th pin of the connector XS5; the 3rd pin of the relay K3 is connected to the 11th pin of the connector XS5; the 5th pin of the relay K3 is connected to the 12th pin of the connector XS5; the 1st pin of the relay K3 is respectively connected to the cathode of the diode D11 and one end of the resistor R33 and connected to the 24V power supply signal; the other end of the resistor R33 is connected to the anode of the light-emitting diode D4;

[0095] The first pin of the optical coupler U25 is connected to one end of the resistor R38; the other end of the resistor R38 is connected to the 31st pin of the control chip U10 to start or stop the red / green indicator light on the panel; the second pin of the optical coupler U25 is grounded; the third pin of the optical coupler U25 is connected to a 0V power supply signal; the fourth pin of the optical coupler U25 is respectively connected to the 12th pin of the relay K4, the positive electrode of the diode D12 and the negative electrode of the light-emitting diode D5; the fourth pin of the relay K4 is connected to the first pin of the connector XS5; the fourth pin of the relay K4 is connected to the first pin of the connector XS5; the fourth pin of the relay K4 is connected to the first pin of the connector XS5. Pin 9 is connected to pin 2 of connector XS5; pin 10 of the relay K4 is connected to pin 3 of connector XS5; pin 8 of the relay K4 is connected to pin 4 of connector XS5; pin 3 of the relay K4 is connected to pin 5 of connector XS5; pin 5 of the relay K4 is connected to pin 6 of connector XS5; pin 1 of the relay K4 is respectively connected to the cathode of diode D12 and one end of resistor R34 and connected to a 24V power supply signal; the other end of the resistor R34 is connected to the anode of light-emitting diode D5.

[0096] like Figure 12 As shown, the second power driving circuit 17 includes: a chip U16, an optical coupler U26, a resistor R71, a resistor R72 and a resistor R73;

[0097] The 5th pin of the chip U16 is respectively connected to the 6th pin of the chip U16, the 7th pin of the chip U16, the 8th pin of the chip U16 and the 1st pin of the yellow indicator light 18 connector XS7 to control the switch of the yellow indicator light 18; the 3rd pin of the yellow indicator light 18 connector XS7 is connected to the 0V power supply signal; the S1 pin of the chip U16 is respectively connected to the S2 pin of the chip U16, the S3 pin of the chip U16 and one end of the resistor R71 and connected to the 24V power supply signal; the G pin of the chip U16 is connected to one end of the resistor R72; the other end of the resistor R72 is respectively connected to the other end of the resistor R71 and the 4th pin of the optocoupler U26; the 1st pin of the optocoupler U26 is connected to one end of the resistor R73; the other end of the resistor R73 is connected to the 29th pin of the control chip U10 to start or stop the alarm light; the 2nd pin of the optocoupler U26 is grounded; the 3rd pin of the optocoupler U26 is connected to the 0V power supply signal.

[0098] like Figure 13 As shown, the third power driving circuit includes: an optical coupler U22 and an optical coupler U23;

[0099] The first pin of the optical coupler U22 is connected to one end of the resistor R27; the other end of the resistor R27 is connected to the 33rd pin of the control chip U10 to start or stop the high-voltage warning light; the second pin of the optical coupler U22 is grounded; the third pin of the optical coupler U22 is connected to the 0V power signal; the fourth pin of the optical coupler U22 is respectively connected to the 12th pin of the relay K1, the positive electrode of the diode D9 and the negative electrode of the light-emitting diode D2; the fourth pin of the relay K1 is connected to the first pin of the connector XS4; the fourth pin of the relay K1 is connected to the first pin of the connector XS4; the fourth pin of the relay K1 is connected to the first pin of the connector XS4. Pin 9 of the relay K1 is connected to pin 2 of the connector XS4; pin 10 of the relay K1 is connected to pin 3 of the connector XS4; pin 8 of the relay K1 is connected to pin 4 of the connector XS4; pin 3 of the relay K1 is connected to pin 5 of the connector XS4; pin 5 of the relay K1 is connected to pin 6 of the connector XS4; pin 1 of the relay K1 is respectively connected to the cathode of the diode D9 and one end of the resistor R31 and a 24V power signal; the other end of the resistor R31 is connected to the anode of the light-emitting diode D2;

[0100] The first pin of the optical coupler U23 is connected to one end of the resistor R35; the other end of the resistor R35 is connected to the 32nd pin of the control chip U10 to start or stop the low-voltage indicator light; the second pin of the optical coupler U23 is grounded; the third pin of the optical coupler U23 is connected to a 0V power supply signal; the fourth pin of the optical coupler U23 is respectively connected to the 12th pin of the relay K2, the positive electrode of the diode D10 and the negative electrode of the light-emitting diode D3; the fourth pin of the relay K2 is connected to the 7th pin of the connector XS4; the ninth pin of the relay K2 is connected to the 12th pin of the relay K2 ... first pin of the relay K2 is connected to the 12th pin of the relay K The first pin of the relay K2 is connected to the 8th pin of the connector XS4; the 10th pin of the relay K2 is connected to the 9th pin of the connector XS4; the 8th pin of the relay K2 is connected to the 10th pin of the connector XS4; the 3rd pin of the relay K2 is connected to the 11th pin of the connector XS4; the 5th pin of the relay K2 is connected to the 12th pin of the connector XS4; the 1st pin of the relay K2 is respectively connected to the cathode of the diode D10 and one end of the resistor R32 and connected to the 24V power supply signal; the other end of the resistor R32 is connected to the anode of the light-emitting diode D3.

[0101] In this embodiment, the device integrates voltage conversion, isolation and measurement, the safety residual pressure safety threshold is easy to set, the voltage value calculation and process are computer controlled, and it is installed online without complicated operations.

[0102] In this embodiment, as shown in Table 1, Table 1 is a main connection table of the microprocessor 12.

[0103] Table 1

[0104]

[0105]

[0106] In this embodiment, as shown in Table 2, Table 2 is a wiring diagram of the first DC current transmitter 2 and the second DC current transmitter 7.

[0107] Table 2

[0108]

[0109]

Claims

1. A rail transit contact network live state display device, characterized in that: The display device is connected to the traction power grid and includes: a chassis, and a first high-voltage fuse (1), a first direct current transmitter (2), a first I / V converter (3), a first signal amplifier (4), a first signal isolator (5) located inside the chassis and connected in sequence, as well as a second high-voltage fuse (6), a second direct current transmitter (7), a second I / V converter (8), a second signal amplifier (9), a second signal isolator (10), and the first signal isolator (5), the second signal isolator (10) and a microprocessor (12) all connected to the A / D converter (11), and a display (14), a red / green two-color indicator light (16), a yellow indicator light (18) and a dot matrix LED screen (20) all connected to the microprocessor (12); wherein the traction power grid is connected to the first high-voltage fuse (1) and the second high-voltage fuse (6) respectively.

2. The rail transit contact network live state display device according to claim 1, characterized in that: The microprocessor (12) is connected to the display (14) via RS485 (13); the microprocessor (12) is connected to the red / green dual-color indicator light (16) via a first power drive circuit (15); the microprocessor (12) is connected to the yellow indicator light (18) via a second power drive circuit (17); and the microprocessor (12) is connected to the dot matrix LED screen (20) via a third power drive circuit (19).

3. The rail transit contact network live state display device according to claim 2, characterized in that: The microprocessor (12) includes a control chip U10; The PC13 pin of the control chip U10, the PC14 pin of the control chip U10, and the PC15 pin of the control chip U10 are all connected to the A / D converter (11); the PA2 pin of the control chip U10 and the PA3 pin of the control chip U10 are both connected to the RS485 (13); the 29th pin of the control chip U10 is connected to the second power drive circuit (17); the 30th pin of the control chip U10 and the 31st pin of the control chip U10 are both connected to the first power drive circuit (15); the 32nd pin of the control chip U10 and the 33rd pin of the control chip U10 are both connected to the third power drive circuit (19).

4. The rail transit contact network live state display device according to claim 3, characterized in that: The first I / V converter (3) comprises: a resistor R10 and a resistor R11; One end of the resistor R10 is connected to the first signal amplifier (4) and the first DC current transmitter (2), respectively; one end of the resistor R11 is connected to the first signal amplifier (4) and the first DC current transmitter (2), respectively; the other end of the resistor R10 is connected to the other end of the resistor R11; The first signal amplifier (4) comprises: an operational amplifier U1A, a resistor R12, a resistor R13, a resistor R14, a resistor R55, a capacitor C1 and a capacitor C2; The output end of the operational amplifier U1A is connected to one end of the resistor R14 and the first signal isolator respectively; the inverting input end of the operational amplifier U1A is connected to one end of the resistor R13 and the other end of the resistor R14 respectively; the non-inverting input end of the operational amplifier U1A is connected to one end of the resistor R12 and one end of the resistor R55 respectively; the positive power input end of the operational amplifier U1A is connected to one end of the capacitor C1 and is connected to the +5BV power signal; the negative power input end of the operational amplifier U1A is grounded; the other end of the capacitor C1 is connected to the other end of the resistor R55 and is grounded; the other end of the resistor R12 is connected to one end of the capacitor C2, one end of the resistor R10 and the first DC current transmitter (2); the other end of the resistor R13 is connected to the other end of the capacitor C2, one end of the resistor R11 and the first DC current transmitter (2); The first signal isolator (5) comprises an optical coupler U5; The first pin of the optocoupler U5 is connected to one end of the resistor R19; the second pin of the optocoupler U5 is connected to the +5BV power supply signal; the third pin of the optocoupler U5 is respectively connected to the inverting input terminal of the operational amplifier U1D, one end of the capacitor C11, one end of the resistor R15 and the grounded capacitor C9; the fourth pin of the optocoupler U5 is grounded; the fifth pin of the optocoupler U5 is connected to the non-inverting input terminal of the operational amplifier U2A and grounded; the sixth pin of the optocoupler U5 is respectively connected to the inverting input terminal of the operational amplifier U2A, one end of the resistor R16 and one end of the capacitor C8; the output terminal of the operational amplifier U1D is respectively connected to the other end of the resistor R19 and the other end of the capacitor C11; the non-inverting input terminal of the operational amplifier U1D is connected to the ground. The phase input terminal is grounded; the other end of the resistor R15 is connected to the output terminal of the operational amplifier U1A; the output terminal of the operational amplifier U2A is respectively connected to one end of the resistor R21, one end of the resistor R59 and the other end of the capacitor C8; the positive power input terminal of the operational amplifier U2A is connected to the grounded capacitor C5 and connected to the +5V power signal; the negative power input terminal of the operational amplifier U2A is grounded; the other end of the resistor R16 is connected to the other end of the resistor R59; the other end of the resistor R21 is respectively connected to one end of the resistor R30, one end of the capacitor C26, the positive electrode of the polarized capacitor EC3 and the A / D converter (11); the other end of the resistor R30 is respectively connected to the other end of the capacitor C26 and the negative electrode of the polarized capacitor EC3 and grounded.

5. The rail transit contact network live state display device according to claim 4, characterized in that: The second I / V converter (8) includes: a resistor R77 and a resistor R78; One end of the resistor R77 is connected to the second signal amplifier (9) and the second DC current transmitter (7) respectively; one end of the resistor R78 is connected to the second signal amplifier (9) and the second DC current transmitter (7) respectively; the other end of the resistor R77 is connected to the other end of the resistor R78; The second signal amplifier (9) comprises: an operational amplifier U1B, a resistor R39, a resistor R40, a resistor R41, a resistor R42 and a capacitor C3; The output end of the operational amplifier U1B is respectively connected to one end of the resistor R41 and the second signal isolator (10); the non-inverting input end of the operational amplifier U1B is respectively connected to one end of the resistor R39 and one end of the resistor R42; the inverting input end of the operational amplifier U1B is respectively connected to the other end of the resistor R41 and one end of the resistor R40; the other end of the resistor R42 is grounded; the other end of the resistor R39 is respectively connected to one end of the capacitor C3, one end of the resistor R77 and the second DC current transmitter (7); the other end of the resistor R40 is respectively connected to the other end of the capacitor C3, one end of the resistor R78 and the second DC current transmitter (7); The second signal isolator (10) includes an optical coupler U6; The first pin of the optocoupler U6 is connected to one end of the resistor R20; the second pin of the optocoupler U6 is connected to the +5BV power supply signal; the third pin of the optocoupler U6 is respectively connected to the inverting input terminal of the operational amplifier U1C, one end of the capacitor C12, one end of the resistor R17 and the grounded capacitor C4; the fourth pin of the optocoupler U6 is grounded; the fifth pin of the optocoupler U6 is connected to the non-inverting input terminal of the operational amplifier U2B and is grounded; the sixth pin of the optocoupler U6 is respectively connected to the inverting input terminal of the operational amplifier U2B, one end of the resistor R18 and one end of the capacitor C17; the output terminal of the operational amplifier U1C is respectively connected to the inverting input terminal of the resistor R20 The other end of the resistor R17 is connected to the other end of the capacitor C12; the non-inverting input end of the operational amplifier U1C is grounded; the other end of the resistor R17 is connected to the output end of the operational amplifier U1B; the output end of the operational amplifier U2B is respectively connected to one end of the resistor R22, one end of the resistor R60 and the other end of the capacitor C17; the other end of the resistor R18 is connected to the other end of the resistor R60; the other end of the resistor R22 is respectively connected to one end of the resistor R53, one end of the capacitor C27, the positive electrode of the polarized capacitor EC7 and the A / D converter (11); the other end of the resistor R53 is respectively connected to the other end of the capacitor C27 and the negative electrode of the polarized capacitor EC7 and grounded.

6. The rail transit contact network live state display device according to claim 5, characterized in that: The A / D converter (11) includes a chip U14; The IN0 pin of the chip U14 is connected to the positive pole of the polarized capacitor EC3; the IN1 pin of the chip U14 is connected to the positive pole of the polarized capacitor EC7; the 12th pin of the chip U14 is connected to the PC15 pin of the control chip U10; the 13th pin of the chip U14 is connected to the PC14 pin of the control chip U10; the 14th pin of the chip U14 is connected to the PC13 pin of the control chip U10.

7. The rail transit contact network live state display device according to claim 6, characterized in that: The RS485 (13) includes a chip U13; The 7th pin of the chip U13 is connected to the display (14), one end of the bidirectional voltage regulator diode D13, one end of the bidirectional voltage regulator diode D14, one end of the resistor R50 and one end of the resistor R51 respectively; the 6th pin of the chip U13 is connected to the display (14), the other end of the bidirectional voltage regulator diode D13, one end of the bidirectional voltage regulator diode D15, the other end of the resistor R50 and one end of the resistor R52 respectively; the other end of the resistor R52 is connected to the +5AV power supply signal; the other end of the bidirectional voltage regulator diode D14 is connected to the +5AV power supply signal The other end of the resistor R51 is connected and grounded; the other end of the bidirectional voltage regulator diode D15 is grounded; the RO pin of the chip U13 is connected to the 7th pin of the chip U12; the RE pin of the chip U13 is respectively connected to the DE pin of the chip U13 and the 4th pin of the chip U9; the DI pin of the chip U13 is connected to the 6th pin of the chip U12; the VoA pin of the chip U12 is connected to the PA2 pin of the control chip U10; and the ViB pin of the chip U12 is connected to the PA3 pin of the control chip U10.

8. The rail transit contact network live state display device according to claim 7, characterized in that: The red / green dual-color indicator light (16) includes a connector XS5; The first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, the eighth pin, the ninth pin, the tenth pin, the eleventh pin and the twelfth pin of the connector XS5 are all connected to the first power drive circuit (15); The dot matrix LED screen (20) includes a connector XS4; The first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, the eighth pin, the ninth pin, the tenth pin, the eleventh pin and the twelfth pin of the connector XS4 are all connected to the third power drive circuit (19).

9. The rail transit contact network live state display device according to claim 8, characterized in that: The first power driving circuit (15) includes: an optical coupler U24 and an optical coupler U25; The first pin of the optocoupler U24 is connected to one end of the resistor R37; the other end of the resistor R37 is connected to the 30th pin of the control chip U10; the second pin of the optocoupler U24 is grounded; the third pin of the optocoupler U24 is connected to a 0V power signal; the fourth pin of the optocoupler U24 is connected to the 12th pin of the relay K3; the fourth pin of the relay K3 is connected to the 7th pin of the connector XS5; the ninth pin of the relay K3 is connected to the 8th pin of the connector XS5; the 10th pin of the relay K3 is connected to the 9th pin of the connector XS5; the 8th pin of the relay K3 is connected to the 10th pin of the connector XS5; the third pin of the relay K3 is connected to the 11th pin of the connector XS5; and the fifth pin of the relay K3 is connected to the 12th pin of the connector XS5. The first pin of the optocoupler U25 is connected to one end of the resistor R38; the other end of the resistor R38 is connected to the 31st pin of the control chip U10; the second pin of the optocoupler U25 is grounded; the third pin of the optocoupler U25 is connected to a 0V power signal; the fourth pin of the optocoupler U25 is connected to the 12th pin of the relay K4; the fourth pin of the relay K4 is connected to the first pin of the connector XS5; the ninth pin of the relay K4 is connected to the second pin of the connector XS5; the tenth pin of the relay K4 is connected to the third pin of the connector XS5; the eighth pin of the relay K4 is connected to the fourth pin of the connector XS5; the third pin of the relay K4 is connected to the fifth pin of the connector XS5; and the fifth pin of the relay K4 is connected to the sixth pin of the connector XS5. The second power driving circuit (17) includes: a chip U16 and an optical coupler U26; The 5th pin of the chip U16 is connected to the 6th pin of the chip U16, the 7th pin of the chip U16, the 8th pin of the chip U16 and the 1st pin of the yellow indicator light (18) connector XS7 respectively; the 3rd pin of the yellow indicator light (18) connector XS7 is connected to the 0V power signal; the 1st pin of the optocoupler U26 is connected to one end of the resistor R73; the other end of the resistor R73 is connected to the 29th pin of the control chip U10.

10. The rail transit contact network live state display device according to claim 8, characterized in that: The third power driving circuit (19) includes: an optical coupler U22 and an optical coupler U23; The first pin of the optocoupler U22 is connected to one end of the resistor R27; the other end of the resistor R27 is connected to the 33rd pin of the control chip U10; the second pin of the optocoupler U22 is grounded; the third pin of the optocoupler U22 is connected to a 0V power signal; the fourth pin of the optocoupler U22 is connected to the 12th pin of the relay K1; the fourth pin of the relay K1 is connected to the first pin of the connector XS4; the ninth pin of the relay K1 is connected to the second pin of the connector XS4; the tenth pin of the relay K1 is connected to the third pin of the connector XS4; the eighth pin of the relay K1 is connected to the fourth pin of the connector XS4; the third pin of the relay K1 is connected to the fifth pin of the connector XS4; and the fifth pin of the relay K1 is connected to the sixth pin of the connector XS4. The first pin of the optocoupler U23 is connected to one end of the resistor R35; the other end of the resistor R35 is connected to the 32nd pin of the control chip U10; the second pin of the optocoupler U23 is grounded; the third pin of the optocoupler U23 is connected to a 0V power supply signal; the fourth pin of the optocoupler U23 is connected to the 12th pin of the relay K2; the fourth pin of the relay K2 is connected to the 7th pin of the connector XS4; the 9th pin of the relay K2 is connected to the 8th pin of the connector XS4; the 10th pin of the relay K2 is connected to the 9th pin of the connector XS4; the 8th pin of the relay K2 is connected to the 10th pin of the connector XS4; the 3rd pin of the relay K2 is connected to the 11th pin of the connector XS4; and the 5th pin of the relay K2 is connected to the 12th pin of the connector XS4.

Images