Induction energy taking circuit of contact network

Abstract

The utility model discloses an inductive energy-taking circuit of a contact network. The inductive energy-taking circuit comprises an energy-taking coil, an anti-impact protection circuit, a denoising and anti-surge circuit, a rectifying circuit, a filter circuit and a voltage stabilizing circuit, the anti-impact protection circuit, the noise-eliminating and anti-surge circuit, the rectifying circuit, the filtering circuit and the voltage stabilizing circuit are connected in sequence; the energy taking coil is used for being connected to a contact wire and is used for obtaining an electric signal of the contact wire; the energy taking coil is connected to the input end of the anti-impact protection circuit, and the output end of the voltage stabilizing circuit is used for being connected with monitoring equipment needing power supply, so that obtained electric signals flow to the monitoring equipment through the voltage stabilizing circuit. According to the utility model, switching noise in induction electric signals is filtered out through the noise-eliminating and surge-preventing circuit, and high-amplitude and high-frequency electric signals generated by instant through-flow on a contact wire are suppressed, so that stable power supply to monitoring equipment is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of inductive energy harvesting, in particular to an inductive energy harvesting circuit for a catenary system. Background Art

[0002] A catenary system is a traction power supply system, which is mostly erected in a sectionalized manner. When a train runs in a certain section, an alternating current of about 1000 A will flow through the contact wire. In order to effectively utilize the large alternating current, inductive energy harvesting circuits are widely used in catenary systems. When a train runs in a certain section, the inductive energy harvesting circuit obtains the large alternating current through an energy harvesting coil. In this way, the obtained large alternating current can be used to supply power to monitoring devices. However, when there is no train passing through this section, the current flowing through the contact wire is usually less than 10 A, almost no current, and the energy harvesting coil cannot couple enough induced voltage, so there is no current flowing through the inductive energy harvesting circuit. Based on this, as the number of train trips increases, the number of trains entering the same catenary section continues to increase, which leads to the alternating presence of large current → no current → large current →... in the contact wire of this section, and further causes the increase in the frequency of "on" and "off" of the inductive energy harvesting circuit; this situation will cause a large switching noise in the alternating current induced by the energy harvesting coil, and is also greatly affected by surge current, making the electric energy in the circuit in an unstable transmission state many times, thus affecting the power supply stability of the monitoring device. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide an inductive energy harvesting circuit for a catenary system to achieve stable power supply to monitoring devices.

[0004] To achieve the above purpose, the inductive energy harvesting circuit for a catenary system proposed by the utility model includes an energy harvesting coil, an impact protection circuit, a noise and surge suppression circuit, a rectification circuit, a filtering circuit, and a voltage stabilization circuit; the impact protection circuit, the noise and surge suppression circuit, the rectification circuit, the filtering circuit, and the voltage stabilization circuit are connected in sequence; the energy harvesting coil is used to be connected to the contact wire to obtain the electrical signal of the contact wire; the energy harvesting coil is connected to the input end of the impact protection circuit, and the output end of the voltage stabilization circuit is used to be connected to the monitoring device to be powered, so that the obtained electrical signal flows to the monitoring device through the voltage stabilization circuit.

[0005] Optionally, the noise and surge suppression circuit includes two filtering modules connected in parallel, and one end of each of the two filtering circuits is respectively connected to the impact protection circuit, and the other end is respectively connected to the energy harvesting coil.

[0006] Optionally, each filtering module includes two capacitors connected in parallel, and the two capacitors of one filtering module are connected in parallel and then connected to the two capacitors connected in parallel of the other filtering module.

[0007] Optionally, a signal amplification circuit is further connected between the impact protection circuit and the noise elimination and surge protection circuit, and the two filter modules are respectively connected to the signal amplification circuit, so that the electrical signal of the impact protection flows to the noise elimination and surge protection circuit after signal amplification.

[0008] Optionally, the signal amplification circuit includes a first resistor, a first operational amplifier, a second resistor, and a third resistor. One end of the first resistor is connected to the energy-taking coil, and the other end of the first resistor is connected to an input terminal of the first operational amplifier. The other input terminal of the first operational amplifier is connected to the second resistor, and the other end of the second resistor is connected to the other end of the energy-taking coil; one end of the third resistor is connected to the output terminal of the first operational amplifier, and the other end of the third resistor is connected to the line between the first operational amplifier and the second resistor. The output terminal of the first operational amplifier is connected to the two filter modules.

[0009] Optionally, an AC harmonic elimination circuit is connected between the rectification circuit and the noise elimination and surge protection circuit, and the AC harmonic elimination circuit is connected to the output terminal of the first operational amplifier.

[0010] Optionally, the AC harmonic elimination circuit includes a sixth capacitor, a second operational amplifier, and a fourth resistor, a fifth resistor, and a fifth capacitor connected in sequence. The other end of the fourth resistor is connected to the output terminal of the first operational amplifier. The other end of the fifth capacitor is connected to the other end of the energy-taking coil. One input terminal of the second operational amplifier is connected to the line between the fifth resistor and the fifth capacitor. The other input terminal of the second operational amplifier is connected to one end of the sixth capacitor, and the other end of the sixth capacitor is connected to the line between the fifth resistor and the fourth resistor. The output terminal of the second operational amplifier is connected to the rectification circuit.

[0011] Optionally, the rectification circuit includes a rectification diode. One input terminal of the rectification diode is connected to the output terminal of the second operational amplifier, and the other input terminal of the rectification diode is connected to the other end of the energy-taking coil. The two output terminals of the rectification diode are respectively connected to the filter circuit.

[0012] Optionally, a DC harmonic elimination circuit is connected between the filter circuit and the rectification circuit, and the rectification circuit is connected to the filter circuit through the DC harmonic elimination circuit.

[0013] Optionally, the DC harmonic elimination circuit includes a fifth diode, an inductor, a seventh capacitor, and an electrolytic capacitor. The seventh capacitor is connected in parallel with the electrolytic capacitor. The fifth diode, the inductor, and the parallel-connected seventh capacitor and electrolytic capacitor are connected in sequence. The other end of the fifth diode is connected to one end of the rectifier circuit. The parallel-connected seventh capacitor and electrolytic capacitor are connected to the other end of the rectifier circuit. The inductor is connected to the filter circuit.

[0014] In the technical solution of the present utility model, an energy-taking coil is used to obtain the electrical signal of the contact wire. The obtained electrical signal is successively supplied to the monitoring device through an impact protection circuit, a noise elimination and surge protection circuit, a rectifier circuit, a filter circuit, and a voltage stabilization circuit. Since the flowing electrical signal filters out the switching noise in the induced electrical signal and suppresses the high-amplitude and high-frequency electrical signals generated by the instantaneous current passing through the contact wire through the noise elimination and surge protection circuit, stable power supply to the monitoring device is achieved. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0016] Figure 1 It is the electrical signal flow diagram of the induction energy-taking circuit of the catenary of the present utility model;

[0017] Figure 2 It is the circuit diagram of the induction energy-taking circuit of the catenary of the present utility model;

[0018] The realization of the purpose, functional features, and advantages of the present utility model will be further described with reference to the embodiments and the drawings. Detailed Embodiment

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will change accordingly.

[0021] See Figure 1 As shown, in an embodiment of the present utility model, an inductive energy-taking circuit for a catenary includes an energy-taking coil, an impact protection circuit, a noise elimination and surge protection circuit, a rectification circuit, a filtering circuit, and a voltage stabilization circuit; the impact protection circuit, the noise elimination and surge protection circuit, the rectification circuit, the filtering circuit, and the voltage stabilization circuit are connected in sequence; the energy-taking coil is used to be connected to a contact wire to obtain the electrical signal of the contact wire; the energy-taking coil is connected to the input end of the impact protection circuit, and the output end of the voltage stabilization circuit is used to be connected to a monitoring device to be powered, so that the obtained electrical signal flows to the monitoring device through the voltage stabilization circuit.

[0022] The technical solution of the present utility model obtains the electrical signal of the contact wire through the energy-taking coil, and the obtained electrical signal is successively supplied to the monitoring device through the impact protection circuit, the noise elimination and surge protection circuit, the rectification circuit, the filtering circuit, and the voltage stabilization circuit. Since the flowing electrical signal filters out the switching noise in the inductive electrical signal and suppresses the high-amplitude and high-frequency electrical signals generated by the instantaneous current conduction on the contact wire through the noise elimination and surge protection circuit, stable power supply to the monitoring device is achieved. In addition, the connection in the embodiments of the present utility model can be a direct connection or an indirect connection. For example, the connection between the impact protection circuit and the noise elimination and surge protection circuit can be a direct connection between the impact protection circuit and the noise elimination and surge protection circuit, or an indirect connection between the impact protection circuit and the noise elimination and surge protection circuit through a signal amplification circuit. The embodiments of the present utility model are not limited thereto, and the above are all within the protection scope of the present utility model.

[0023] It should be noted that the alternating current obtained by the energy-taking coil coupling contains high-frequency signals of fundamental waves and various harmonic components, and there are also harmonic components caused by non-linear loads during the power conversion process, which are difficult to be eliminated by a simple filter circuit. Harmonics have a great impact on the quality of power conversion. Seriously, they can directly cause the failure of the induction energy-taking module of the device, and cannot ensure the power supply stability of the on-line monitoring device. Therefore, the induction energy-taking circuit of the embodiment of the present invention further includes a signal amplification circuit, an AC harmonic elimination circuit, and a DC harmonic elimination circuit. The impact protection circuit, the signal amplification circuit, the noise elimination and surge protection circuit, the AC harmonic elimination circuit, the rectification circuit, the DC harmonic elimination circuit, the filter circuit, and the voltage stabilization circuit are arranged in sequence. In this way, the electrical signal of the impact protection is amplified by the signal amplification circuit and then flows to the noise elimination and surge protection circuit, thereby improving the signal-to-noise ratio of the electrical signal and reducing the degree of noise interference. Moreover, the AC harmonic elimination circuit and the DC harmonic elimination circuit are introduced to filter out the harmonic components in the process of induction alternating current and converted direct current respectively, ensuring the quality of power conversion, reducing the failure rate of the formed induction energy-taking circuit, and further improving the power supply stability of the monitoring device.

[0024] In an embodiment of the present invention, refer to Figure 2 As shown, the impact protection circuit includes a varistor MOV; both ends of the varistor MOV are respectively connected to both ends of the energy-taking coil. Of course, in the embodiment of the present invention, multiple varistors MOV can also be connected in series to form an impact protection circuit through the series-connected varistors MOV. The embodiment of the present invention is not limited thereto, and the above are all within the protection scope of the present invention.

[0025] In an embodiment of the present invention, refer to Figure 2 As shown, the signal amplification circuit includes a first resistor R1, a first operational amplifier A1, a second resistor R2, and a third resistor R3. One end of the first resistor R1 is connected to one end of the energy-taking coil, and the other end of the first resistor R1 is connected to an input terminal of the first operational amplifier A1. The other input terminal of the first operational amplifier A1 is connected to the second resistor R2, and the other end of the second resistor R2 is connected to the other end of the energy-taking coil; one end of the third resistor R3 is connected to the output terminal of the first operational amplifier A1, and the other end of the third resistor R3 is connected to the line between the first operational amplifier A1 and the second resistor R2. The output terminal of the first operational amplifier A1 is connected to a noise elimination and surge protection circuit. The embodiment of the present invention amplifies the induced voltage signal output by the energy-taking coil, improves the signal-to-noise ratio of the electrical signal, and reduces the degree of noise interference.

[0026] In an embodiment of the present invention, refer to Figure 2As shown, the noise cancellation and surge protection circuit includes two filter modules connected in parallel. One end of the two filter circuits is respectively connected to the output terminal of the first operational amplifier A1, and the other end of the two filter circuits is respectively connected to the other end of the energy harvesting coil. The filter module includes two capacitors connected in parallel. After the two capacitors of one filter module are connected in parallel, they are connected in parallel with the two capacitors connected in parallel of the other filter module. Specifically, the first capacitor C1 and the second capacitor C2 are connected in parallel to form a filter module, the third capacitor C3 and the fourth capacitor C4 are connected in parallel to form a filter module, and the two filter modules are connected in parallel. The two ends of the two filter modules are respectively connected to the output terminal of the first operational amplifier A1 and the other end of the energy harvesting module. In the embodiment of the present invention, since the flowing electrical signal filters out the switching noise in the induced electrical signal and suppresses the high-amplitude and high-frequency electrical signals generated by the instantaneous current conduction on the contact wire through the noise cancellation and surge protection circuit, the stable power supply for the monitoring device is realized.

[0027] In an embodiment of the present invention, refer to Figure 2 As shown, the AC harmonic cancellation circuit includes a fourth resistor R4, a fifth resistor R5, a fifth capacitor C5, a sixth capacitor C6, and a second operational amplifier A2. The fourth resistor R4, the fifth resistor R5, and the fifth capacitor C5 are connected in sequence. The other end of the fourth resistor R4 is connected to the output terminal of the first operational amplifier A1, the other end of the fifth capacitor C5 is connected to the other end of the energy harvesting coil, one input terminal of the second operational amplifier A2 is connected to the line between the fifth resistor R5 and the fifth capacitor C5, the other input terminal of the second operational amplifier A2 is connected to one end of the sixth capacitor R6, and the other end of the sixth capacitor R6 is connected to the line between the fifth resistor R5 and the fourth resistor R4. The output terminal of the second operational amplifier A2 is connected to the rectifier circuit. In the embodiment of the present invention, the harmonic components in the induced alternating current are filtered out, ensuring the quality of power conversion, reducing the failure rate of the formed inductive energy harvesting circuit, and further improving the stability of the power supply for the monitoring device.

[0028] In an embodiment of the present invention, refer to Figure 2 As shown, the rectifier circuit includes four diodes. The anode of diode D1 is connected to the cathode of diode D2, the anode of diode D2 is connected to the cathode of diode D3, the anode of diode D3 is connected to the cathode of diode D4, and the anode of diode D4 is connected to the cathode of diode D1. The anode of diode D1 is also connected to the output terminal of the second operational amplifier A2, and the cathode of diode D3 is also connected to the other end of the energy harvesting coil. The cathode of diode D1 and the anode of diode D3 are respectively connected to the DC harmonic cancellation circuit.

[0029] In an embodiment of the present invention, refer to Figure 2As shown, the DC harmonic elimination circuit includes a fifth diode C5, an inductor L1, a seventh capacitor C7, and an electrolytic capacitor E1. The seventh capacitor C7 is connected in parallel with the electrolytic capacitor E1. The fifth diode C5, the inductor L1, and the parallel-connected seventh capacitor C7 and the electrolytic capacitor E1 are connected in sequence. The other end of the fifth diode C5 is connected to the cathode of the diode D1. The parallel-connected seventh capacitor C7 and the electrolytic capacitor E1 are connected to the anode of the diode D3. The inductor L1 is connected to the filter circuit. The embodiment of the present invention filters the harmonic components during the conversion of direct current, ensuring the quality of power conversion, reducing the failure rate of the formed inductive energy harvesting circuit, and further improving the stability of power supply to the monitoring device.

[0030] In an embodiment of the present invention, refer to Figure 2 As shown, the filter circuit includes an eighth capacitor C8. One end of the eighth capacitor C8 is connected to the line between the inductor L1 and the parallel-connected electrolytic capacitor E1 and the seventh capacitor C7. The other end of the eighth capacitor C8 is connected to the anode of the diode D3.

[0031] In an embodiment of the present invention, refer to Figure 2 As shown, the voltage stabilizing circuit includes a voltage regulator DC / DC. One input terminal of the voltage regulator DC / DC is connected to the line between the inductor L1 and the eighth capacitor C8. The other end of the voltage regulator DC / DC is connected to the anode of the diode D3.

[0032] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An inductive energy acquisition circuit for an overhead contact line, characterized in that It includes an energy-taking coil, an impact protection circuit, a noise and surge suppression circuit, a rectification circuit, a filtering circuit, and a voltage stabilization circuit; the impact protection circuit, the noise and surge suppression circuit, the rectification circuit, the filtering circuit, and the voltage stabilization circuit are connected in sequence; the energy-taking coil is used to be connected to the contact wire to obtain the electrical signal of the contact wire; the energy-taking coil is connected to the input end of the impact protection circuit, and the output end of the voltage stabilization circuit is used to be connected to the monitoring device to be powered, so that the obtained electrical signal flows to the monitoring device through the voltage stabilization circuit.

2. The induction energy acquisition circuit of the catenary according to claim 1, characterized in that, The noise and surge suppression circuit includes two filtering modules connected in parallel. One end of the two filtering circuits is respectively connected to the impact protection circuit, and the other end is respectively connected to the energy-taking coil.

3. The inductive energy harvesting circuit of the catenary according to claim 2, characterized in that, The filtering module includes two capacitors connected in parallel. After the two capacitors of one filtering module are connected in parallel, they are connected to the two capacitors connected in parallel of the other filtering module.

4. The induction energy extraction circuit of the catenary according to claim 2, wherein A signal amplification circuit is also connected between the impact protection circuit and the noise and surge suppression circuit. The two filtering modules are respectively connected to the signal amplification circuit, so that the electrical signal of the impact protection is amplified and then flows to the noise and surge suppression circuit.

5. The inductive energy harvesting circuit of the catenary according to claim 4, characterized in that, The signal amplification circuit includes a first resistor, a first operational amplifier, a second resistor, and a third resistor. One end of the first resistor is connected to the energy-taking coil, the other end of the first resistor is connected to one input end of the first operational amplifier, the other input end of the first operational amplifier is connected to the second resistor, and the other end of the second resistor is connected to the other end of the energy-taking coil; one end of the third resistor is connected to the output end of the first operational amplifier, the other end of the third resistor is connected to the line between the first operational amplifier and the second resistor, and the output end of the first operational amplifier is connected to the two filtering modules.

6. The inductive energy extraction circuit of the catenary according to claim 5, characterized in that An AC harmonic elimination circuit is connected between the rectification circuit and the noise and surge suppression circuit, and the AC harmonic elimination circuit is connected to the output end of the first operational amplifier.

7. The inductive power acquisition circuit of the catenary according to claim 6, characterized in that, The AC harmonic elimination circuit includes a sixth capacitor, a second operational amplifier, and a fourth resistor, a fifth resistor, and a fifth capacitor connected in sequence. The other end of the fourth resistor is connected to the output end of the first operational amplifier, the other end of the fifth capacitor is connected to the other end of the energy-taking coil, one input end of the second operational amplifier is connected to the line between the fifth resistor and the fifth capacitor, the other input end of the second operational amplifier is connected to one end of the sixth capacitor, the other end of the sixth capacitor is connected to the line between the fifth resistor and the fourth resistor, and the output end of the second operational amplifier is connected to the rectification circuit.

8. The inductive power acquisition circuit of the catenary according to claim 7, characterized in that, The rectification circuit includes a rectifying diode. One input end of the rectifying diode is connected to the output end of the second operational amplifier, the other input end of the rectifying diode is connected to the other end of the energy-taking coil, and the two output ends of the rectifying diode are respectively connected to the filtering circuit.

9. The induction power-taking circuit of the catenary according to any one of claims 1 to 8, characterized in that, A DC harmonic elimination circuit is connected between the filtering circuit and the rectification circuit, and the rectification circuit is connected to the filtering circuit through the DC harmonic elimination circuit.

10. The induction power acquisition circuit of the catenary according to claim 9, characterized in that, The DC harmonic elimination circuit includes a fifth diode, an inductor, a seventh capacitor, and an electrolytic capacitor. The seventh capacitor is connected in parallel with the electrolytic capacitor. The fifth diode, the inductor, and the seventh capacitor and the electrolytic capacitor after parallel connection are connected in sequence. The other end of the fifth diode is connected to one end of the rectifier circuit. The seventh capacitor and the electrolytic capacitor after parallel connection are connected to the other end of the rectifier circuit. The inductor is connected to the filter circuit.

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