Induction energy-taking circuit of contact network fault on-line monitoring device

Abstract

The utility model relates to the technical field of electric energy conversion and energy supply, in particular to an induction energy taking circuit of an overhead line system fault on-line monitoring device, which is characterized in that an energy taking sensor is firstly electrically connected with an impact protection circuit and a surge suppression and noise elimination circuit, and then is connected with a rectifying circuit, an energy taking circuit and an energy storage circuit; a voltage control switch is arranged between the energy taking circuit and the energy storage circuit, the voltage control switch is adjusted and controlled by a charging and discharging control circuit, the energy storage circuit is connected to a voltage stabilizing circuit, and the voltage stabilizing circuit is provided with an interface matched with a load. The online fault monitoring device has the advantages that long-term, stable and reliable electric energy supply of the online fault monitoring device on the contact network can be ensured for the operation state of the sectionalized contact network.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy conversion and energy supply, and in particular to an induction energy acquisition circuit of an online monitoring device for contact network faults. Background Art

[0002] Typically, online monitoring devices for railway overhead line faults are installed directly on high-potential conductors. The power supply often utilizes a magnetic field coupling method. The AC signal coupled from the energy harvesting sensor is rectified, filtered, and stabilized before being converted into the DC voltage required by the device. To increase the output power of the energy harvesting power supply, current approaches often optimize the design of the energy harvesting sensor to improve its coupled output value, while ignoring the fact that the subsequent inductive energy harvesting circuit is also a key factor affecting the output power of the energy harvesting power supply. Furthermore, most existing energy harvesting circuits utilize a direct full discharge method for the capacitors, resulting in low power consumption. Therefore, a rational design of the energy harvesting circuit's drive method can effectively increase the output power of the energy harvesting power supply.

[0003] Furthermore, the railway overhead contact network is constructed in multiple sections. When a train is running, a high current of approximately 1000A is generated on the conductors. When no train is running, the current on the conductors is less than 10A, which is considered to be zero current. Therefore, when using magnetic field coupling for energy extraction, no coupling can be achieved when no train is present, and the energy extraction circuit is in a stopped state. As the number of trains crossing each other increases, the overhead contact network in the same section is intermittently used by multiple trains, causing the high-potential conductors to alternate between high current and zero current. This causes the monitoring device's inductive energy extraction circuit to be passively switched on and off, making it significantly affected by surge currents. Over time, this situation cannot guarantee the normal operation of the energy extraction circuit components, affecting energy extraction stability. Summary of the Invention

[0004] The purpose of the present utility model is to provide an inductive energy-taking circuit for an online monitoring device for a contact network fault, based on the deficiencies of the above-mentioned prior art, which can suppress the influence of surge currents caused by multiple current flows through the contact network on the equipment components, and improve the stability of the power conversion of the monitoring device; in addition, taking into account the occasional operation of the contact network line current, in order to improve the output power of the energy-taking power supply, a charge and discharge control circuit is used to adjust the output power of the power conversion, thereby improving the control ability and storage efficiency of the electric energy during the line current flow time, and ensuring the power reliability of the monitoring device.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] An inductive energy-sourcing circuit for an online monitoring device for contact network faults includes an energy-sourcing sensor, and is characterized in that: the energy-sourcing sensor is first electrically connected to an impact protection circuit and a surge suppression and noise reduction circuit, and is then connected to a rectifier circuit, an energy-sourcing circuit, and an energy storage circuit; a voltage-controlled switch is provided between the energy-sourcing circuit and the energy storage circuit; the voltage-controlled switch is regulated and controlled by a charge and discharge control circuit; the energy storage circuit is connected to a voltage-stabilizing circuit, and the voltage-stabilizing circuit has an interface that matches the load.

[0007] The impact protection circuit adopts a varistor.

[0008] The surge suppression and noise elimination circuit is composed of two capacitors connected in parallel.

[0009] The rectifier circuit is a full-bridge rectifier circuit, and the full-bridge rectifier circuit is composed of four diodes.

[0010] The charge and discharge control circuit includes a resistor and an operational amplifier.

[0011] The voltage controlled switch adopts a field effect tube.

[0012] The energy storage circuit is composed of a freewheeling diode, a reactance and a capacitor.

[0013] The voltage stabilizing circuit adopts a switch integrated voltage stabilizer.

[0014] Advantages of this utility model:

[0015] 1) Applied in railway contact networks, it can suppress the impact of surge current on equipment components and improve the power conversion stability of monitoring devices;

[0016] 2) When used in railway contact networks, it can improve the control capability and storage efficiency of electric energy during the line flow time, thereby increasing the output power of the energy source and ensuring the power reliability of the monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a processing flow chart of the utility model;

[0018] Figure 2 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0020] Example: Figure 2 As shown, the inductive energy acquisition circuit of the online monitoring device for contact network faults in this embodiment includes an energy acquisition sensor, which has the following functions:

[0021] (1) Impact protection circuit: completed by varistor MOV;

[0022] (2) Surge suppression and noise elimination circuit: completed by capacitors C1 and C2;

[0023] (3) Rectification circuit: Completed by a full-bridge rectifier circuit, which is completed by diodes D1, D2, D3, and D4;

[0024] (4) Energy taking circuit: It is completed by anti-reverse diode D5, inductor L1 and capacitor C3;

[0025] (5) Charge and discharge control circuit: It is completed by resistors R1, R2, R3, R4, R5, R6 and operational amplifiers A1 and A2, where resistor R3 is connected to the external reference voltage Ug;

[0026] (6) Voltage controlled switch: completed by field effect transistor Q1;

[0027] (7) Energy storage circuit: composed of freewheeling diode D6, reactance L2, and capacitor C4;

[0028] (8) Voltage stabilization circuit: completed by a switch integrated voltage stabilizer.

[0029] like Figure 1 As shown, the inductive energy harvesting circuit in this embodiment has the following working process:

[0030] The energy-taking sensor is coupled to obtain the protection effect of the impact protection circuit on the AC signal and the processing of the surge suppression and consumption circuit, which suppresses the impact of the surge current on the equipment components caused by multiple currents in the contact network; the AC signal is converted into a DC voltage after rectification and transmitted to the energy-taking circuit. The voltage control switch connected to the energy-taking circuit is controlled by the charging and discharging control circuit to adjust the output power of the electric energy conversion to the energy storage circuit, and the energy storage circuit is provided to the power load after voltage stabilization.

[0031] Although the above embodiments have described the concepts and embodiments of the present invention in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described here one by one.

Claims

1. An inductive energy-harvesting circuit for an online monitoring device for a contact network fault, comprising an energy-harvesting sensor, characterized in that: The energy acquisition sensor is first electrically connected to an impact protection circuit and a surge suppression and noise reduction circuit, and then connected to a rectifier circuit, an energy acquisition circuit and an energy storage circuit. A voltage control switch is arranged between the energy acquisition circuit and the energy storage circuit. The voltage control switch is regulated and controlled by the charge and discharge control circuit. The energy storage circuit is connected to a voltage stabilizing circuit, and the voltage stabilizing circuit has an interface that matches the load.

2. The inductive energy-harvesting circuit of the online monitoring device for overhead line faults according to claim 1, characterized in that: The impact protection circuit adopts a varistor.

3. The inductive energy-harvesting circuit of the online monitoring device for overhead line faults according to claim 1, characterized in that: The surge suppression and noise elimination circuit is composed of two capacitors connected in parallel.

4. The inductive energy-harvesting circuit of the online monitoring device for overhead line faults according to claim 1, characterized in that: The rectifier circuit is a full-bridge rectifier circuit, and the full-bridge rectifier circuit is composed of four diodes.

5. The inductive energy-harvesting circuit of the online monitoring device for overhead line faults according to claim 1, characterized in that: The charge and discharge control circuit includes a resistor and an operational amplifier.

6. The inductive energy-harvesting circuit of the online monitoring device for overhead line faults according to claim 1, characterized in that: The voltage controlled switch adopts a field effect tube.

7. The inductive energy-harvesting circuit of the online monitoring device for overhead line faults according to claim 1, characterized in that: The energy storage circuit is composed of a freewheeling diode, a reactance and a capacitor.

8. The inductive energy-harvesting circuit of the online monitoring device for overhead line faults according to claim 1, characterized in that: The voltage stabilizing circuit adopts a switch integrated voltage stabilizer.

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