Energy taking circuit of overhead line system fault monitoring device and overhead line system fault monitoring device

Abstract

The utility model discloses an energy taking circuit of a contact network fault monitoring device and a monitoring device, and the energy taking circuit comprises a first harmonic filtering module which is used for obtaining a DC signal from the circuit and carrying out harmonic filtering processing; the inversion module is electrically connected with the first harmonic filtering module, and the inversion module receives the electric signal processed by the first harmonic filtering module and inverts the electric signal; the first rectification module is electrically connected with the inversion module, and the first rectification module receives the alternating current signal of the inversion module and converts the alternating current signal into a direct current signal; and the second harmonic filtering module is electrically connected with the first rectification module and is used for carrying out harmonic filtering processing on the direct current signal processed by the rectification module and then supplying power to the monitoring device. The energy taking circuit can solve the technical problem that harmonic components caused by a non-linear load in the circuit are difficult to be eliminated by a simple harmonic filtering circuit, and provides stable power supply for a terminal.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power supply, in particular to an energy taking circuit of a contact network fault monitoring device and a contact network fault monitoring device. Background Art

[0002] Railway contact network fault monitoring devices are usually installed in outdoor environments, and electric energy is a necessary condition for the monitoring device to work continuously and stably. Since the contact network works in a strong electromagnetic environment for a long time, when a train is running on the line, a large current of 800 to 1200A will flow through the contact line to maintain the operation of the train. Therefore, most fault monitoring devices use current induction to obtain power, and use energy extraction coils to provide external power to the device.

[0003] However, the overhead line is a traction power supply system. It only generates large current when the train is running in the line section. When there is no train running, the current in the line is usually less than 10A. At this time, the energy-taking coil can basically not be coupled to the AC voltage, the external power supply is in the off state, and no power flows through the energy-taking circuit. The overhead line is mostly built in sections. With the increase in the number of trains running, the frequency of occasional current on the line increases. The overhead line is repeatedly connected and disconnected. The AC power coupled by the energy-taking coil of the energy-taking circuit is difficult to be eliminated by a simple filter circuit even after a series of treatments such as noise suppression and surge protection. It has a great impact on the quality of power conversion. In severe cases, it even causes the monitoring equipment to be paralyzed and the fault monitoring function of the overhead line is lost. Utility Model Content

[0004] The utility model designs an energy-taking circuit of a contact network fault monitoring device, aiming to solve the technical problem that harmonic components caused by nonlinear loads in the energy-taking circuit are difficult to be eliminated by a simple filter harmonic circuit.

[0005] To achieve the above-mentioned purpose, the utility model provides an energy-taking circuit of a contact network fault monitoring device, comprising: a first filter module, used to obtain a DC signal from a circuit and perform filter processing; an inverter module, the inverter module is electrically connected to the first filter module, the inverter module receives the electrical signal processed by the first filter module and performs inversion processing on the electrical signal; a first rectifier module, the first rectifier module is electrically connected to the inverter module, the first rectifier module receives the AC signal of the inverter module and converts the AC signal into a DC signal; a second filter module, the second filter module is electrically connected to the first rectifier module, used to filter the DC signal processed by the rectifier module and then supply power to the monitoring device; and a second rectifier module, the second rectifier module is electrically connected to the first filter module, the second rectifier module is used to obtain the DC signal from the circuit and transmit it to the first filter module;

[0006] The first filter module includes a fifth anti-reverse diode, a first inductor, a second inductor, a fifth capacitor and a sixth capacitor, a first electrolytic capacitor and a second electrolytic capacitor, an operational amplifier, a first resistor and a second resistor; one end of the fifth anti-reverse diode and the first inductor connected in series is positively connected to the negative output end of the second rectifier module, and the other end is connected to one end of the second inductor; the other end of the second inductor is connected to the positive input end of the operational amplifier; one end of the fifth capacitor and the first electrolytic capacitor connected in parallel is connected to one end of the second inductor, and the other end is connected to the positive output end of the second rectifier module; one end of the sixth capacitor and the second electrolytic capacitor connected in parallel is connected to the positive input end of the operational amplifier, and the other end is connected to the positive output end of the second rectifier module; one end of the first resistor is connected to the negative input end of the operational amplifier, and the other end is connected to the positive output end of the second rectifier module; one end of the second resistor is connected to the negative input end of the operational amplifier, and the other end is connected to the output end of the operational amplifier; the output end of the operational amplifier is connected to the positive input end of the inverter module;

[0007] The second filter module includes a third inductor, a seventh capacitor and a third electrolytic capacitor, one end of the third inductor is connected to the positive output end of the first rectifier module, and the other end is connected to the positive input end of the filter module; the seventh capacitor and the third electrolytic capacitor are connected in parallel, and one end is connected to the negative output end of the first rectifier module, and the other end is connected to the other end of the third inductor.

[0008] Furthermore, before obtaining the DC signal, an anti-shock protection module and a switching noise and surge current suppression module are electrically connected in sequence. The anti-shock protection module is used to obtain an electrical signal from an external energy extraction coil, and the switching noise and surge current suppression module is electrically connected to the second rectifier module.

[0009] Furthermore, the anti-shock protection module includes a varistor, and two ends of the varistor are connected in parallel to two ends of the energy extraction coil.

[0010] Furthermore, the switching noise and surge current suppression module includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor. The first capacitor and the second capacitor are connected in parallel and then connected in parallel to the two ends of the energy extraction coil. The third capacitor and the fourth capacitor are connected in parallel and then connected in parallel to the two ends of the energy extraction coil.

[0011] Furthermore, before power is supplied to the monitoring device, a filter module and a voltage stabilizing module are electrically connected in sequence, the filter module is electrically connected to the second filter module, and the voltage stabilizing module is used to supply power to the monitoring device.

[0012] Furthermore, the inverter module is a bridge inverter circuit, the positive input terminal of the inverter module is connected to the output terminal of the operational amplifier, and the negative input terminal of the inverter module is connected to the negative output terminal of the second rectifier module.

[0013] Furthermore, the first rectifier module is a full-bridge rectifier circuit, and two ends of the input of the first rectifier module are respectively connected to two ends of the output of the inverter module.

[0014] The utility model also provides a contact network fault monitoring device, including a monitoring unit and the above-mentioned energy extraction circuit, wherein the energy extraction circuit is electrically connected to the monitoring unit, and the energy extraction circuit processes the acquired electrical signal and provides stable power supply to the monitoring unit.

[0015] By adopting the energy-taking circuit of the utility model, the harmonic components in the circuit are filtered due to the use of the first filtering module, and then the electric signal is inverted and rectified, and then filtered by the second filtering module, thereby effectively filtering out the harmonic components caused by the nonlinear load, providing a stable and reliable guarantee for the power supply of the monitoring terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of an energy extraction circuit according to an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of an energy extraction circuit according to another embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the structure of a monitoring device according to an embodiment of the utility model;

[0020] Description of reference numerals:

[0021]

[0022] The purpose of the present invention, its energy supply characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The railway overhead contact network is a traction power supply system that relies on the movement of trains to generate induced current, thereby providing power to equipment that does not have a power supply environment. However, due to the discontinuity of the trains passing through, the overhead contact network line is repeatedly switched on and off, and the alternating current obtained by coupling the energy-taking coil of the energy-taking circuit often contains certain harmonic components, which have a great impact on the quality of power conversion. Therefore, the utility model provides an energy-taking circuit for an overhead contact network fault monitoring device, which aims to solve the technical problem that the harmonic components caused by nonlinear loads in the energy-taking circuit are difficult to be eliminated by simple filtering circuits.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Embodiment 1

[0026] See also Figure 1 , 2 As shown, an energy taking circuit of a contact network fault monitoring device comprises:

[0027] A first filter module 4, used for acquiring a DC signal from a circuit and performing filter processing;

[0028] An inverter module 5, wherein the inverter module 5 is electrically connected to the first filter module 4, and the inverter module 5 receives the electrical signal processed by the first filter module 4 and performs an inversion process on the electrical signal;

[0029] A first rectifier module 6, wherein the first rectifier module 6 is electrically connected to the inverter module 5, and the first rectifier module 6 receives an AC signal from the inverter module 5 and converts the AC signal into a DC signal;

[0030] The second filtering module 7 is electrically connected to the first rectifying module 6 and is used for filtering the direct current signal processed by the rectifying module and then supplying power to the monitoring device.

[0031] When in use, the first filter module 4 obtains a DC signal from the front-end circuit, performs filtering and harmonic processing, and then transmits it to the inverter module 5. The inverter module 5 converts the DC signal after the first filtering and harmonic processing into an AC signal, and then the first rectifier module converts the AC signal into a DC signal, and finally passes through the second filter module for harmonic filtering processing, thereby achieving effective suppression of harmonic components caused by nonlinear loads in the circuit, and providing stable power supply guarantee for subsequent monitoring devices.

[0032] Embodiment 2

[0033] See also Figure 1 , 2 As shown, on the basis of embodiment 1, further, before obtaining the DC signal, an anti-shock protection module 1, a switching noise and surge current suppression module 2, and a second rectifier module 3 are electrically connected in sequence, wherein the anti-shock protection module 1 is used to obtain an electrical signal from an external energy extraction coil, and the second rectifier module 3 is electrically connected to the first filter module 4.

[0034] In order to further improve the power supply stability and reliability of the power supply circuit, before obtaining the DC signal and inputting it into the first filter and tuner module, an anti-shock protection module 1, a switching noise and surge current suppression module 2, and a second rectifier module 3 are also provided. The output end of the anti-shock protection module 1 is connected to the input end of the switching noise and surge current suppression module 2, the output end of the switching noise and surge current suppression module 2 is connected to the input end of the second rectifier module 3, and the output end of the second rectifier module 3 is connected to the input end of the first filter and tuner module.

[0035] The anti-shock protection module 1 can prevent and reduce the impact on components in the circuit caused by sudden changes in current; the switching noise and surge current suppression module can suppress the problem of large voltage fluctuation range caused by switching noise and surge current, and further protect the power supply stability of the energy extraction circuit.

[0036] Embodiment 3

[0037] See also Figure 1 , 2 As shown, on the basis of the second embodiment, the anti-shock protection module 1 further comprises a varistor, and two ends of the varistor MOV are connected in parallel to two ends of the energy taking coil.

[0038] When using the anti-shock protection module 1 of this embodiment, the resistance of the varistor MOV changes with the voltage. Under normal working conditions, the resistance of the varistor is very high and hardly affects the normal operation of the circuit. However, when the circuit is impacted or over-voltage occurs, the resistance of the varistor will drop sharply, allowing it to absorb excessive voltage and current to protect the circuit from damage.

[0039] When an overvoltage occurs in the circuit, the varistor will quickly conduct, absorb the overvoltage and disperse it to the ground, thereby protecting other components in the circuit from damage. The working principle of the varistor is similar to that of a gas discharge tube, but its response speed is faster and its response to voltage is more sensitive. This further ensures the power supply stability of the energy extraction circuit of the utility model.

[0040] Embodiment 4

[0041] See also Figure 1, 2 As shown, on the basis of the second embodiment, the switching noise and surge current suppression module 2 further includes a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4. The first capacitor C1 and the second capacitor C2 are connected in parallel and then connected in parallel to the two ends of the energy taking coil. The third capacitor C3 and the fourth capacitor C4 are connected in parallel and then connected in parallel to the two ends of the energy taking coil.

[0042] Capacitors have the characteristics of storing and releasing electric charge, and can play a role in filtering and suppressing noise in the circuit. In the switching circuit, the switching of the switch will produce sudden changes in voltage and current, which will cause noise and surge current. Using multiple capacitors can suppress switching noise: capacitors can filter high-frequency noise, because the impedance of capacitors to high-frequency signals is very small, so high-frequency signals can pass through, and the impedance to low-frequency signals is very large, which can prevent low-frequency signals from passing through. Therefore, when there are noise signals in the switching circuit, capacitors can filter these noise signals, thereby reducing interference to the circuit.

[0043] On the other hand, in a switching circuit, the switching of the switch will cause instantaneous changes in current and generate surge current. By adding capacitors to the circuit, it can absorb and release charges when the voltage suddenly changes, thereby alleviating the instantaneous changes in current, reducing the amplitude of the surge current, and protecting other components in the circuit from damage.

[0044] By using the switching noise and surge current suppression module formed by the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 of this embodiment, the power supply stability of the energy harvesting circuit can be further improved.

[0045] Embodiment 5

[0046] See also Figure 1 , 2 As shown, before power is supplied to the monitoring device, a filter module 8 and a voltage stabilizing module 9 are electrically connected in sequence. The filter module 8 is electrically connected to the second filter and tuning module 7. The voltage stabilizing module 9 is used to supply power to the monitoring device.

[0047] In order to further enhance the stability of the energy extraction circuit, a filter module 8 and a voltage stabilizing module 9 are provided before power is supplied to the monitoring device. The input end of the filter module 8 is connected to the output end of the second filter module 7, and the output end of the filter module is connected to the input end of the voltage stabilizing module. Finally, the voltage stabilizing module 9 outputs an electrical signal to the monitoring device.

[0048] The filter module 8 includes an eighth capacitor C8, which is connected in parallel to both ends of the input end of the voltage stabilizing module 9. The capacitor has different impedance characteristics for electrical signals of different frequencies. Specifically, the capacitor has a lower impedance to high-frequency signals and a higher impedance to low-frequency signals. This characteristic enables the capacitor to play a filtering role in the circuit, passing high-frequency signals and blocking low-frequency signals. Therefore, by using the filter module, the electrical signals in the energy extraction circuit of the utility model can be filtered, further improving the stability of the power supply.

[0049] The voltage stabilizing module 9 adopts a DC / DC circuit design. A DC / DC converter is an electronic device that converts a DC voltage into another DC voltage. Since most DC / DC converters use feedback control technology, by continuously monitoring the output voltage and comparing it with the set target voltage, the on-time of the switch tube is adjusted to keep the output voltage near the set value. This feedback control mechanism can achieve voltage regulation of the output voltage so that it is not affected by input voltage fluctuations and load changes. Therefore, the use of this voltage stabilizing module can further improve the power supply stability of the energy extraction circuit of the utility model.

[0050] Embodiment 6

[0051] See also Figure 2 As shown, on the basis of the fifth embodiment, further, the first filter module 4 includes a fifth anti-reverse diode D5, a first inductor L1, a second inductor L2, a fifth capacitor C5 and a sixth capacitor C6, a first electrolytic capacitor E1 and a second electrolytic capacitor E2, an operational amplifier A, a first resistor R1 and a second resistor R2; the fifth anti-reverse diode D5 and the first inductor L1 are connected in series, and one end of the positive electrode is connected to the negative output end of the second rectifier module 3, and the other end is connected to one end of the second inductor L2; the other end of the second inductor L2 is connected to the positive input end of the operational amplifier A; the fifth capacitor L5 and the first electrolytic capacitor E1 are connected in parallel. One end of the connection is connected to one end of the second inductor L2, and the other end is connected to the positive output end of the second rectifier module 3; one end of the sixth capacitor C6 and the second electrolytic capacitor E2 after being connected in parallel is connected to the positive input end of the operational amplifier A, and the other end is connected to the positive output end of the second rectifier module 3; one end of the first resistor R1 is connected to the negative input end of the operational amplifier A, and the other end is connected to the positive output end of the second rectifier module 3; one end of the second resistor R2 is connected to the negative input end of the operational amplifier A, and the other end is connected to the output end of the operational amplifier A; the output end of the operational amplifier A is connected to the positive input end of the inverter module 5.

[0052] The benefit of using two sets of capacitors and electrolytic capacitors in parallel is not only to increase the total capacitance, but also to improve the frequency response efficiency, reduce voltage fluctuations and noise interference, and improve the stability of the circuit.

[0053] Embodiment 7

[0054] The inverter module is a bridge inverter circuit, the positive input terminal of the inverter module is connected to the output terminal of the operational amplifier, and the negative input terminal of the inverter module is connected to the negative output terminal of the second rectifier module.

[0055] Embodiment 8

[0056] The first rectifier module is a full-bridge rectifier circuit, and two ends of the input of the first rectifier module are respectively connected to two ends of the output of the inverter module.

[0057] Embodiment 9

[0058] The second filter module includes a third inductor, a seventh capacitor and a third electrolytic capacitor, one end of the third inductor is connected to the positive output end of the first rectifier module, and the other end is connected to the positive input end of the filter module; the seventh capacitor and the third electrolytic capacitor are connected in parallel, and one end is connected to the negative output end of the first rectifier module, and the other end is connected to the other end of the third inductor.

[0059] Embodiment 10

[0060] A contact network fault monitoring device comprises a monitoring unit and the above-mentioned energy extraction circuit, wherein the energy extraction circuit is electrically connected to the monitoring unit, and the energy extraction circuit processes the acquired electrical signal and then provides stable power supply to the monitoring unit.

[0061] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An energy taking circuit of a contact network fault monitoring device, characterized in that: include: A first filter module, used for acquiring a DC signal from a circuit and performing filter processing; An inverter module, the inverter module is electrically connected to the first filter and harmonic module, the inverter module receives the electrical signal processed by the first filter and harmonic module and performs inversion processing on the electrical signal; A first rectifier module, the first rectifier module is electrically connected to the inverter module, the first rectifier module receives the AC signal of the inverter module and converts the AC signal into a DC signal; A second filter module, which is electrically connected to the first rectifier module and is used to filter the DC signal processed by the rectifier module and then supply power to the monitoring device; a second rectifier module, the second rectifier module is electrically connected to the first filter module, and the second rectifier module is used to obtain a direct current signal from a circuit and transmit it to the first filter module; and Before supplying power to the monitoring device, a filter module and a voltage stabilizing module are electrically connected in sequence, the filter module is electrically connected to the second filter module, and the voltage stabilizing module is used to supply power to the monitoring device; The first filter module includes a fifth anti-reverse diode, a first inductor, a second inductor, a fifth capacitor and a sixth capacitor, a first electrolytic capacitor and a second electrolytic capacitor, an operational amplifier, a first resistor and a second resistor; one end of the fifth anti-reverse diode and the first inductor connected in series is positively connected to the negative output end of the second rectifier module, and the other end is connected to one end of the second inductor; the other end of the second inductor is connected to the positive input end of the operational amplifier; one end of the fifth capacitor and the first electrolytic capacitor connected in parallel is connected to one end of the second inductor, and the other end is connected to the positive output end of the second rectifier module; one end of the sixth capacitor and the second electrolytic capacitor connected in parallel is connected to the positive input end of the operational amplifier, and the other end is connected to the positive output end of the second rectifier module; one end of the first resistor is connected to the negative input end of the operational amplifier, and the other end is connected to the positive output end of the second rectifier module; one end of the second resistor is connected to the negative input end of the operational amplifier, and the other end is connected to the output end of the operational amplifier; the output end of the operational amplifier is connected to the positive input end of the inverter module; The second filter module includes a third inductor, a seventh capacitor and a third electrolytic capacitor, one end of the third inductor is connected to the positive output end of the first rectifier module, and the other end is connected to the positive input end of the filter module; the seventh capacitor and the third electrolytic capacitor are connected in parallel, and one end is connected to the negative output end of the first rectifier module, and the other end is connected to the other end of the third inductor.

2. The energy taking circuit of the overhead line fault monitoring device according to claim 1, characterized in that: Before obtaining the DC signal, an anti-shock protection module and a switching noise and surge current suppression module are electrically connected in sequence. The anti-shock protection module is used to obtain an electrical signal from an external energy extraction coil, and the switching noise and surge current suppression module is electrically connected to the second rectifier module.

3. The energy taking circuit of the overhead line fault monitoring device according to claim 2 is characterized in that: The anti-shock protection module includes a varistor, and two ends of the varistor are connected in parallel to two ends of the energy extraction coil.

4. The energy taking circuit of the overhead line fault monitoring device according to claim 2, characterized in that: The switching noise and surge current suppression module includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor. The first capacitor and the second capacitor are connected in parallel and then connected in parallel to the two ends of the energy extraction coil. The third capacitor and the fourth capacitor are connected in parallel and then connected in parallel to the two ends of the energy extraction coil.

5. The energy taking circuit of the overhead line fault monitoring device according to claim 1, characterized in that: The inverter module is a bridge inverter circuit, the positive input terminal of the inverter module is connected to the output terminal of the operational amplifier, and the negative input terminal of the inverter module is connected to the negative output terminal of the second rectifier module.

6. The energy taking circuit of the overhead line fault monitoring device according to claim 2, characterized in that: The first rectifier module is a full-bridge rectifier circuit, and two ends of the input of the first rectifier module are respectively connected to two ends of the output of the inverter module.

7. A contact network fault monitoring device, characterized in that: It comprises a monitoring unit and an energy extraction circuit as claimed in any one of claims 1 to 6, wherein the energy extraction circuit is electrically connected to the monitoring unit, and the energy extraction circuit processes the acquired electrical signal and then provides stable power supply to the monitoring unit.

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