Energy taking device for trigger circuit of power electronic device

Abstract

The utility model relates to the technical field of power electronic device energy taking, and discloses an energy taking device for a power electronic device trigger circuit. The energy taking device comprises a power supply device, a high-voltage conductor, current transformers and a rectification filter circuit, the high-voltage conductor is coated with a first insulating layer, the power supply device is electrically connected with the two ends of the high-voltage conductor so that alternating current can flow through the high-voltage conductor, and the current transformers are arranged on the high-voltage conductor at intervals in a sleeving mode and tightly attached to the first insulating layer. The output end of the current transformer is connected with the input end of the rectification filter circuit. The power electronic device trigger circuit is connected with the output end of the rectification filter circuit. According to the energy taking device, the current transformer is tightly attached to the first insulating layer of the high-voltage conductor, so that no air gap exists between the current transformer and the high-voltage conductor, the problems of corona, partial discharge and the like at the air gap position are avoided, the power supply reliability of a trigger circuit of a power electronic device is improved, and long-term reliable operation of a direct-current power transmission system is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model embodiment relates to power electronic device energy taking technical field, concretely relates to a kind of energy taking device for power electronic device trigger circuit. BACKGROUND

[0002] High-voltage direct-current transmission system has the advantages of long transmission distance, large transmission capacity and low loss, and is one of the important ways to realize the optimization of China's energy resources.

[0003] Currently, in high-voltage direct-current transmission system, the trigger circuit of power electronic device mostly uses through cable and supporting frame fixed current transformer as the power taking mode of power electronic device. A number of primary windings of current transformer are sleeved on high-voltage cable, and the secondary winding outputs low-voltage alternating voltage signal, which is processed by subsequent rectifier filter circuit to output direct-current voltage to power the trigger circuit of power electronic device.

[0004] The inventors of the present application found that when the current transformer is arranged on the high-voltage cable, there will be an air gap between the current transformer and the cable. Because the dielectric constant of air is low, when the cable is subjected to high voltage, corona, partial discharge and other phenomena are likely to occur at the air gap. Under the long-term effect, the high-voltage cable can be aged, the normal power supply of the power electronic device trigger circuit is affected, the abnormal accident of the power electronic device on the direct-current valve side occurs, and the stable operation of the direct-current transmission is affected. UTILITY MODEL CONTENT

[0005] The utility model aims to provide an energy taking device for power electronic device trigger circuit to solve the problems in the background art.

[0006] The utility model embodiment provides an energy taking device for power electronic device trigger circuit, comprising: a power supply device, a high-voltage conductor, a current transformer and a rectifier filter circuit.

[0007] The outer side of the high-voltage conductor is covered with a first insulating layer;

[0008] The high-voltage conductor is electrically connected to the power supply device at both ends, so that the high-voltage conductor flows through alternating current;

[0009] The current transformer and the rectifier filter circuit are each provided with a plurality of;

[0010] A plurality of current transformers are sleeved on the high-voltage conductor at intervals and tightly fit with the first insulating layer;

[0011] The input ends of a plurality of rectifier filter circuits are electrically connected to the output ends of a plurality of current transformers, respectively;

[0012] A plurality of power electronic device trigger circuits are electrically connected to the output ends of the plurality of rectification filter circuits respectively, and the current transformer and the rectification filter circuit are used for sensing the alternating current flowing through the high-voltage conductor and converting the sensed alternating current into direct current voltage to be transmitted to the trigger circuit of the power electronic device.

[0013] Based on the above scheme, the power taking device for the power electronic device trigger circuit is provided with the power supply device, the high-voltage conductor, the current transformer and the rectification filter circuit, the outer side of the high-voltage conductor is covered with the first insulation layer, the high-voltage conductor is electrically connected to the power supply device at both ends, the plurality of current transformers are spaced apart and sleeved on the high-voltage conductor and tightly attached to the first insulation layer, the input ends of the plurality of rectification filter circuits are electrically connected to the output ends of the plurality of current transformers respectively, and the plurality of power electronic device trigger circuits are electrically connected to the output ends of the plurality of rectification filter circuits respectively. The power taking device for the power electronic device trigger circuit has the first insulation layer covering the outer side of the high-voltage conductor, the current transformer is tightly attached to the first insulation layer when being arranged on the high-voltage conductor, and there is no air gap between the current transformer and the high-voltage conductor, so that the problems of high voltage borne by air at the air gap position and corresponding corona and partial discharge are avoided, the power supply reliability of the power electronic device trigger circuit is improved, and the long-term reliable operation of the direct current transmission system is facilitated.

[0014] In an available scheme, the high-voltage conductor is further provided with a second insulation layer;

[0015] The second insulation layer is spaced apart and covers the outer side of the first insulation layer to separate the high-voltage conductor into a plurality of independent areas;

[0016] The plurality of current transformers are arranged in the plurality of independent areas respectively and tightly attached to the second insulation layer.

[0017] In an available scheme, the material of the first insulation layer and the second insulation layer is one of aramid epoxy polyester, silicone rubber, polyurethane, butyl rubber, epoxy resin or glass fiber.

[0018] In an available scheme, the power electronic device is one or more of IGCT, IGBT or thyristor.

[0019] In an available scheme, the current transformer comprises a magnetic core and a coil;

[0020] The coil is wound on the magnetic core, and both ends of the coil are connected to two input ends of the rectification filter circuit respectively.

[0021] In an available scheme, the rectification filter circuit comprises a rectification bridge, a voltage stabilizing diode, a filter capacitor, a current limiting resistor and a diode.

[0022] Two input ends of the rectifier bridge are connected with two ends of the coil respectively;

[0023] An anode output end of the rectifier bridge is connected with a cathode of the voltage stabilizing diode, one end of the filter capacitor and one end of the current limiting resistor;

[0024] A cathode output end of the rectifier bridge is connected with an anode of the voltage stabilizing diode and the other end of the filter capacitor;

[0025] The other end of the current limiting resistor is connected with the anode of the diode;

[0026] Two ends of a power electronic device trigger circuit are connected with the cathode of the diode and the cathode output end of the rectifier bridge respectively.

[0027] In a feasible scheme, the power supply device is an isolation transformer or a high-frequency alternating current power supply. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0029] Figure 1 It is a schematic diagram of the power taking device for the power electronic device trigger circuit in the present application;

[0030] Figure 2 It is a schematic diagram of the high-voltage conductor in the embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the current transformer in the embodiment of the present application; Figure 2 It is a partial enlarged view of the embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the current transformer in the embodiment of the present application;

[0033] Reference numerals in the drawings:

[0034] 1, power supply device; 2, high-voltage conductor; 21, first insulating layer; 22, second insulating layer; 3, current transformer; 31, magnetic core; 32, coil; 4, rectifier filter circuit; 41, rectifier bridge; 42, voltage stabilizing diode; 43, filter capacitor; 44, current limiting resistor; 45, diode. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0036] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0037] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, can also be detachable connection, can also be integrated; can be mechanical connection, can also be electrical connection, can also be communication connection; can be direct connection, can also be indirect connection through an intermediate medium, can be the communication or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] The technical scheme of the utility model will be described in detail below with specific embodiments. The following several specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in some embodiments.

[0039] As described in the background art of the present application, in a high-voltage direct-current power transmission system, the trigger circuit of power electronic devices usually uses a current transformer with a through cable and a supporting frame fixed type as a power taking mode of the power electronic devices. A plurality of primary windings of the current transformer are sleeved on a high-voltage cable, and a secondary winding outputs a low-voltage alternating voltage signal, which is processed by a subsequent rectifier filter circuit to output a direct-current voltage to the trigger circuit of the power electronic devices for power supply.

[0040] The inventor of the present application finds that when the current transformer is arranged on the high-voltage cable, there is an air gap between the current transformer and the cable. Because the dielectric constant of air is low, when the cable bears a high voltage, corona, partial discharge and other phenomena are prone to occur at the air gap, which can cause the high-voltage cable to age under long-term action, affect the normal power supply of the power electronic device trigger circuit, cause abnormal accidents of the power electronic device on the DC valve side, and affect the stable operation of the DC power transmission.

[0041] In order to solve the above problems, the inventor of the present application proposes the technical scheme of the present application, and the specific implementation is as follows:

[0042] Figure 1 It is a schematic view of the energy taking device for the power electronic device trigger circuit in the utility model, Figure 2 It is a schematic view of the high-voltage conductor in the embodiment of the utility model, Figure 3 It is a schematic view of the current transformer in the embodiment of the utility model, Figure 2 It is a partial enlarged view of the current transformer in the embodiment of the utility model, Figure 4 It is a schematic view of the current transformer in the embodiment of the utility model.

[0043] As shown in Figures 1 to 4 The energy taking device for the power electronic device trigger circuit in the embodiment includes a power supply device 1, a high-voltage conductor 2, a current transformer 3 and a rectifier filter circuit 4.

[0044] The outer surface of the high-voltage conductor 2 is covered with a first insulating layer 21 (equivalent to a high-voltage cable), and the first insulating layer 21 can be covered on the outer side of the high-voltage conductor 2 in a pouring manner. The first insulating layer 21 is tightly attached to the high-voltage conductor 2, and the high-voltage conductor 2 is tightly wrapped.

[0045] The two ends of the high-voltage conductor 2 are electrically connected with the power supply device 1 respectively, and the power supply device 1 outputs a suitable alternating voltage. In normal operation, the power supply device 1 makes the high-voltage conductor 2 pass through an alternating current.

[0046] The current transformer 3 and the rectifier filter circuit 4 are each provided with a plurality of.

[0047] The input end of the current transformer 3 is sleeved on the high-voltage conductor 2 and is tightly attached to the first insulating layer 21 of the high-voltage conductor 2, and there is no air gap between the current transformer 3 and the first insulating layer 21. The plurality of current transformers 3 are arranged on the high-voltage conductor 2 in a length direction, that is, the high-voltage conductor 2 passes through the plurality of current transformers 3, and then the two ends are connected to the power supply device 1.

[0048] The input ends of the plurality of rectifier filter circuits 4 are electrically connected with the output ends of the plurality of current transformers 3 respectively.

[0049] The trigger circuits of the plurality of power electronic devices are respectively connected with the output ends of the plurality of rectification filter circuits 4, that is, the two ends of the trigger circuits are respectively electrically connected with the two output ends of the rectification filter circuits 4.

[0050] In the embodiment, the two ends of the high-voltage conductor are electrically connected with the power supply device, and an alternating current flows through the high-voltage conductor in normal operation. The input end of the current transformer is sleeved on the high-voltage conductor, the current transformer senses the alternating current flowing through the high-voltage conductor, the rectification filter circuit converts the sensed alternating current into a direct current voltage, and then the direct current voltage is transmitted to the trigger circuit of the power electronic device, so as to realize power supply for the power electronic device.

[0051] As can be seen from the above, the energy taking device for the trigger circuit of the power electronic device in the embodiment is provided with a power supply device, a high-voltage conductor, current transformers and rectification filter circuits. The outer side of the high-voltage conductor is covered with a first insulation layer, the two ends of the high-voltage conductor are electrically connected with the power supply device, the plurality of current transformers are spaced apart and sleeved on the high-voltage conductor and tightly fit with the first insulation layer, the input ends of the plurality of rectification filter circuits are electrically connected with the output ends of the plurality of current transformers, and the trigger circuits of the plurality of power electronic devices are respectively electrically connected with the output ends of the plurality of rectification filter circuits. The energy taking device for the trigger circuit of the power electronic device in the embodiment has the following advantages. The outer side of the high-voltage conductor is covered with the first insulation layer, and when the current transformers are arranged on the high-voltage conductor, the current transformers tightly fit with the first insulation layer. There is no air gap between the current transformers and the high-voltage conductor, which avoids the problems of high voltage borne by air at both ends of the air gap and corresponding corona and partial discharge, and improves the power supply reliability of the trigger circuit of the power electronic device, which is conducive to the long-term reliable operation of the direct current transmission system.

[0052] Optionally, as shown in Figure 2 and Figure 3 In the embodiment, the high-voltage conductor 2 is further provided with a second insulation layer 22.

[0053] The second insulation layer 22 is spaced apart and arranged on the high-voltage conductor 2 and located at the middle section of the high-voltage conductor 2 in the length direction. The second insulation layer 22 tightly covers the outer side of the first insulation layer 21, and the second insulation layer 22 separates the high-voltage conductor 2 into a plurality of (multiple sections) independent areas along the length direction, that is, the two adjacent independent areas of the high-voltage conductor 2 are separated by the second insulation layer 22 with a certain thickness.

[0054] The plurality of current transformers 3 are respectively arranged in the plurality of independent areas of the high-voltage conductor 2, and one current transformer 3 is arranged in each independent area. The current transformers 3 tightly fit with the first insulation layer 21 and the second insulation layer 22 of the high-voltage conductor 2, and the air tightness between the current transformers 3 and the high-voltage conductor 2 is enhanced to ensure the insulation requirement between the adjacent high-voltage power electronic devices.

[0055] Further, the power taking device for the power electronic device trigger circuit in the embodiment, the material of the first insulating layer 21 and the second insulating layer 22 of the high-voltage conductor 2 is one of aramid epoxy polyester, silicone rubber, polyurethane, butyl rubber, epoxy resin or glass fiber material, and the first insulating layer 21 and the second insulating layer 22 can be wrapped on the outer side of the high-voltage conductor 2 by means of potting. Of course, the first insulating layer 21 and the second insulating layer 22 can also use other insulating materials that meet the insulation requirements.

[0056] Further, the power taking device for the power electronic device trigger circuit in the embodiment, the power electronic device is one or more of IGCT (integrated gate-commutated thyristor), IGBT (insulated gate bipolar transistor) or thyristor.

[0057] Further, the power taking device for the power electronic device trigger circuit in the embodiment, the current transformer 3 includes a magnetic core 31 and a coil 32.

[0058] The magnetic core 31 of the current transformer 3 is a magnetic ring, that is, the magnetic core 31 is in the form of a circular ring, and the material thereof is silicon steel sheet.

[0059] The coil 32 is wound on the magnetic core 31, and the two ends of the coil 32 are respectively connected with the two input ends of the rectification and filtering circuit 4, and the two output ends of the rectification and filtering circuit 4 are respectively connected with the two ends of the power electronic device trigger circuit.

[0060] In the embodiment, the current transformer 3 is sleeved on the high-voltage conductor 2, and is tightly fitted with the first insulating layer 21 and the second insulating layer 22 of the high-voltage conductor 2, so that there is no air gap between the current transformer 3 and the high-voltage conductor 2. The magnetic core 31 and the coil 32 of the current transformer 3 induce the alternating current flowing through the high-voltage conductor 2, and convert the induced alternating current into alternating voltage, and the rectification and filtering circuit 4 is used to convert the alternating voltage into direct voltage.

[0061] Further, the power taking device for the power electronic device trigger circuit in the embodiment, the rectification and filtering circuit 4 includes a rectification bridge 41, a voltage stabilizing diode 42, a filtering capacitor 43, a current limiting resistor 44 and a diode 45.

[0062] The two input ends of the rectification bridge 41 are respectively connected with the two ends of the coil 32.

[0063] The anode output end of the rectification bridge 41 is connected with the cathode of the voltage stabilizing diode 42, one end of the filtering capacitor 43 and one end of the current limiting resistor 44.

[0064] The cathode output end of the rectification bridge 41 is connected with the anode of the voltage stabilizing diode 42 and the other end of the filtering capacitor 43.

[0065] The other end of the current limiting resistor 44 is connected with the anode of the diode 45.

[0066] The two ends of the power electronic device trigger circuit are connected with the cathode of the diode 45 and the cathode output end of the rectifier bridge 41 respectively.

[0067] Further, the power supply device 1 in the embodiment for the power electronic device trigger circuit is one of an isolation transformer or a high-frequency alternating current power supply.

[0068] In the utility model, unless another definite provision and limitation, first feature is on second feature "on" or "under", can be first feature and second feature direct contact, or first feature and second feature indirectly contact through intermediate medium.

[0069] And, first feature is on second feature "on", "above" and "on", can be first feature is on second feature directly or obliquely, or just indicate first feature horizontal height is higher than second feature. First feature is on second feature "under", "below" and "under", can be first feature is on second feature directly or obliquely, or just indicate first feature horizontal height is lower than second feature.

[0070] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model.

Claims

1. A power harvesting device for a trigger circuit of a power electronic device, characterized in that, include: Power supply unit, high-voltage conductor, current transformer and rectifier filter circuit: The high-voltage conductor is covered with a first insulating layer on its outer side; The two ends of the high-voltage conductor are electrically connected to the power supply device, so that alternating current flows through the high-voltage conductor; Both the current transformer and the rectifier filter circuit are provided with multiple units; Multiple current transformers are spaced apart and sleeved on the high-voltage conductor, tightly fitting the first insulating layer; The input terminals of the plurality of rectifier and filter circuits are respectively electrically connected to the output terminals of the plurality of current transformers; Multiple power electronic device trigger circuits are electrically connected to the output terminals of multiple rectifier and filter circuits respectively. The current transformer and the rectifier and filter circuits are used to sense the AC current flowing through the high-voltage conductor and convert the sensed AC current into DC voltage and then send it to the trigger circuit of the power electronic device.

2. The energy harvesting device for trigger circuits of power electronic devices according to claim 1, characterized in that, The high-voltage conductor is also provided with a second insulating layer; The second insulating layer covers the outside of the first insulating layer at intervals, dividing the high-voltage conductor into multiple independent regions; The multiple current transformers are respectively disposed in the multiple independent regions and are closely attached to the second insulating layer.

3. The energy harvesting device for trigger circuits of power electronic devices according to claim 2, characterized in that, The materials of the first insulating layer and the second insulating layer are one of aramid epoxy polyester, silicone rubber, polyurethane, butyl rubber, epoxy resin or glass fiber.

4. The energy harvesting device for a trigger circuit of a power electronic device according to claim 1, characterized in that, The power electronic device is one or more of IGCT, IGBT, or thyristor.

5. The energy harvesting device for a trigger circuit of a power electronic device according to claim 2, characterized in that, The current transformer includes: a magnetic core and a coil; The coil is wound around the magnetic core, and the two ends of the coil are respectively connected to the two input terminals of the rectifier and filter circuit.

6. The energy harvesting device for a trigger circuit of a power electronic device according to claim 5, characterized in that, The rectifier and filter circuit includes: a rectifier bridge, a Zener diode, a filter capacitor, a current-limiting resistor, and a diode; The two input terminals of the rectifier bridge are respectively connected to the two ends of the coil; The anode output terminal of the rectifier bridge is connected to the cathode of the Zener diode, one end of the filter capacitor, and one end of the current limiting resistor. The cathode output terminal of the rectifier bridge is connected to the anode of the Zener diode and the other end of the filter capacitor; The other end of the current-limiting resistor is connected to the anode of the diode; The two ends of the trigger circuit of the power electronic device are respectively connected to the cathode of the diode and the cathode output terminal of the rectifier bridge.

7. The energy harvesting device for a trigger circuit of a power electronic device according to any one of claims 1 to 6, characterized in that, The power supply device is an isolation transformer or a high-frequency AC power supply.

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