Direct current conversion device of microcomputer control circuit of HXD3C type locomotive

Abstract

The utility model discloses a DC conversion device of a microcomputer control circuit of an HXD3C type locomotive. The DC conversion device comprises a diode module; wherein the power supply side of a reconnection relay in the microcomputer control circuit of the HXD3C type locomotive is connected to a coil of the reconnection relay after passing through the diode module; and a coil of the reconnection relay is used for controlling the opening or closing of a contact of the reconnection relay so as to control whether the microcomputer control circuit of the HXD3C type locomotive is electrified or not. According to the scheme, the rectifier bridge at the end part of the reconnection relay of the microcomputer control circuit in the HXD3C type locomotive is replaced by the two diodes, so that the anti-interference capability of the reconnection relay can be improved, reconnection communication faults are avoided, and the running safety of the HXD3C type locomotive is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the locomotive technical field, concretely relates to a DC conversion device of microcomputer control circuit of HXD3C type locomotive, and especially relates to a full-wave reconstruction structure of microcomputer reconnection relay of HXD3C type locomotive. BACKGROUND

[0002] Some locomotive depots (such as Korla locomotive depot) present allocation HXD3C type locomotive operation interchanges are not fixed reconnection, and sections are each electrification section in the local management. In recent years, HXD3C type locomotive frequently occurs reconnection communication faults in reconnection operation, mainly in the form of two locomotives reconnection state loss, locomotive automatic drop bow, parking brake application and so on when locomotive is over phase, stops, and station stops change end, especially the problems of brake failure and parking brake application caused by locomotive reconnection loss, which brings great security risks to normal operation.

[0003] The above content is only used to assist in understanding the technical scheme of the utility model, and does not represent that the above content is prior art. UTILITY MODEL CONTENT

[0004] The utility model discloses a DC conversion device of microcomputer control circuit of HXD3C type locomotive, and the DC conversion device of microcomputer control circuit of HXD3C type locomotive is provided to solve the problem that locomotive frequently occurs reconnection communication faults, which brings great security risks to normal operation, and reach the effect that the rectifier bridge of the reconnection relay end of the microcomputer control circuit in the HXD3C type locomotive is replaced by two diodes, the anti-interference ability of the reconnection relay can be improved, reconnection communication faults can be avoided, and the safety of HXD3C type locomotive operation is improved.

[0005] The utility model provides a DC conversion device of microcomputer control circuit of HXD3C type locomotive, the microcomputer control circuit of HXD3C type locomotive includes: reconnection relay, the DC conversion device of microcomputer control circuit of HXD3C type locomotive is arranged in the power supply side of reconnection relay, the DC conversion device of microcomputer control circuit of HXD3C type locomotive includes: diode module, wherein the power supply side of reconnection relay is connected to the coil of reconnection relay after diode module, the coil of reconnection relay is used for controlling the opening or closure of the contact of reconnection relay to realize the control of the energization of the microcomputer control circuit of HXD3C type locomotive or not.

[0006] In some embodiments, the diode module includes a first diode and a second diode, and the power supply side of the reconnection relay is connected to the coil of the reconnection relay through the first diode and the second diode respectively.

[0007] In some embodiments, in the case that the power supply on the power supply side is a direct current power supply, the direct current power supply is connected to the anode of the first diode; the cathode of the first diode is connected to the first connection end of the coil of the reconnection relay; the direct current power supply is also connected to the anode of the second diode; and the cathode of the second diode is connected to the second connection end of the coil of the reconnection relay.

[0008] In some embodiments, in the case that the power supply on the power supply side is an alternating current power supply, the live wire of the alternating current power supply is connected to the anode of the first diode; the cathode of the first diode is connected to the first connection end of the coil of the reconnection relay; the zero line of the alternating current power supply is also connected to the anode of the second diode; and the cathode of the second diode is connected to the second connection end of the coil of the reconnection relay.

[0009] In some embodiments, the power of the first diode and the power of the second diode are both above a preset power threshold.

[0010] Therefore, the scheme of the utility model, through the microcomputer reconnection relay of the locomotive, two diodes are arranged to replace the rectifier bridge on the top of the reconnection relay; thus, by replacing the rectifier bridge at the end of the reconnection relay of the microcomputer control circuit in the HXD3C locomotive with two diodes, the anti-interference ability of the reconnection relay can be improved, the reconnection communication fault can be avoided, and the safety of the HXD3C locomotive operation is improved.

[0011] Other features and advantages of the utility model will be described in the subsequent description, and some of them will become apparent from the description, or be understood through the implementation of the utility model.

[0012] The technical scheme of the utility model will be further described in detail below by means of the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an embodiment structure schematic view of the direct current conversion device of the microcomputer control circuit of the HXD3C locomotive of the utility model.

[0014] Figure 2 It is an electrical principle schematic view of the control circuit of the reconnection relay.

[0015] Figure 3 It is a structure schematic view of the control circuit of the reconnection relay.

[0016] Figure 4 It is an interference point schematic view of the high-voltage circuit to the control circuit.

[0017] Figure 5A structure schematic diagram of the modified full-wave rectifier circuit;

[0018] Figure 6 A structure schematic diagram of the rectifier bridge;

[0019] Figure 7 A blocking characteristic schematic diagram of the diode. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model technical scheme will be described clearly and completely below by combining with the utility model specific embodiments and corresponding drawings. Obviously, the described embodiments are only a 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.

[0021] Considering that the HXD3C locomotive frequently occurs in the heavy-haul operation communication fault, the manufacturer has no clear cause analysis and rectification measures for the fault, which leads the locomotive into the vicious cycle of " fault - replacement of spare parts - fault again ". In addition, the fault often occurs in the heavy-haul fault at the moment of stopping, and the fault is that the heavy-haul train set automatically enters the heavy-haul connection interface after the microcomputer suddenly black screen at the moment of stopping, at this time, the main break automatically disconnects, the pantograph automatically lowers, and the brake automatically changes to " non-leading ". After the heavy-haul confirmation on the microcomputer screen, the fault phenomenon is eliminated, and the fault reason is all the heavy-haul relay burnout. When the fault occurs, because the brake automatically changes to " non-leading ", the brake valve loses control operation and does not produce punishment braking, and when the self-valve pressure reduction is insufficient before the fault, it will directly lead to the loss of control of the train, and the safety hidden danger is great.

[0022] For example: from March 2023 to November 2023, 128 HXD3C locomotives of the Korla locomotive depot were allocated, and the original factory relay counted 19 times of faults, and the section modified relay counted 4 times of faults, 4 times of faults were spring tube burnout, and all occurred in the cooperation with the original factory relay, and the section relay never occurred in the cooperation; three is from September 2023 to November 2023, the relay designed and modified by Dalian Locomotive and Rolling Stock Co., Ltd. and Dalian Toshiba Co., Ltd. is installed on 12 locomotives, and the cumulative fault is 2. The tracking effect comparison proves that the subject can effectively solve the problem of relay burnout in the heavy-haul operation of HXD3C locomotive.

[0023] The microcomputer heavy-haul relay of the HXD3C locomotive is connected to the DC110V negative end of the heavy-haul relay coil of another locomotive through the normally closed spring tube of the heavy-haul relay of one locomotive, and the positive end of the relay is the DC110V power supply of the microcomputer circuit of the locomotive. The specific circuit is as follows: Figure 2and Figure 3 as shown, Figure 2 is an electrical schematic diagram of the control circuit of the reconnection relay, Figure 3 is a structural schematic diagram of the control circuit of the reconnection relay.

[0024] In the microcomputer, the electrical structure of the microcomputer mainly includes a microcomputer signal processor M-CPU and a microcomputer signal conversion device INF.

[0025] In Figure 2 the example shown, the reconnection control circuit of the HXD3C locomotive mainly includes a one-end reconnection relay DBLHD12 and a two-end charging relay DBLHD34, both of which are RB-3P521-V2 type imported relays.

[0026] In Figure 3 the example shown, the signal of the DC110V DC power supply is input from the one-end of the vehicle to the anode of the first diode, the cathode of the first diode is connected to the reconnection socket numbered CZ2, and the terminal connection terminal can be connected to the reconnection socket numbered CZ1-R of the other vehicle and the reconnection socket numbered CZ3-R of the two-end of the other vehicle. The socket numbered CZ1-R of the one-end of the other vehicle is connected to the anode of the second diode, and the cathode of the second diode is connected to the output end of the DC110 power supply signal through the contact of the reconnection relay DBL12. The reconnection socket numbered CZ3-R of the two-end of the other vehicle is connected to the anode of the third diode, and the cathode of the third diode is connected to the output end of the DC110 signal through the contact of the reconnection relay DBL34. The signal of the P110V is input from the two-end of the vehicle to the anode of the fourth diode, and the cathode of the fourth diode is connected to the reconnection socket numbered CZ4-R. The terminal CZ4-R is connected to the one-end CZ1-R of the other vehicle and the two-end CZ3-R of the other vehicle. Among them, the first diode, the second diode, the third diode, and the fourth diode can all be selected as type 4100E diodes.

[0027] The power supply of the microcomputer reconnection relay is DC110V, and the power supply of the microcomputer reconnection relay is the same as that of other DC110V relays of the microcomputer. The only difference is that the negative end of the relay is the negative end of the other vehicle, and there may be a phenomenon that the circuit voltages of the negative ends of the two locomotives are inconsistent. However, through the control relationship of the reconnection circuit of the HXD3C locomotive, it can be seen that the negative end of the HXD3C locomotive is controlled to the ground, and there is also a negative end reconnection circuit in the reconnection circuit, so the possibility of overvoltage of the relay caused by inconsistent negative end circuit is excluded.

[0028] Through the performance analysis of the relay, it is found that:

[0029] ①HXD3C locomotive heavy-haul relay installed in Japan Xiguan RB-3P521 V2 (C) reed relay, the type of relay output power supply for AC 230V, coil operating voltage for DC 110V, rated current 0.5A.

[0030] ②HXD3C locomotive, each locomotive installed 32 RB-3P521 V2 (C) reed relay, such as air compressor contactor relay COMP, main break VCBA relay, etc. When the relay works, the action frequency is much higher than the action frequency of heavy-haul relay, but in actual use, in addition to the heavy-haul relay, the remaining relays have never been burned.

[0031] ③According to the manufacturer's data, RB-3P521 V2 (C) reed relay is a Japanese industrial relay, its input power supply is AC 230V / 60Hz, coil operating voltage is DC 110V. The working principle is that the input AC 230V power supply is rectified by the rectifier bridge and then input to the coil. The magnetic field generated by the coil current controls the on-off of the contact in the reed relay. The rectifier bridge uses a diode made in Japan with certain voltage reduction function, its basic parameters are 1000V / 4A.

[0032] HXD3C locomotive including microcomputer heavy-haul control DC 110V circuit, when designed, it adopts negative terminal grounding mode, in theory, the potential of negative terminal grounding is 0 voltage. However, because the return side of high-voltage circuit of the locomotive is also grounded through the vehicle body, when the high-voltage circuit is disconnected, a high-voltage surge phenomenon will occur in the vehicle body for a moment, which will cause a high voltage phenomenon in the negative terminal of DC 110V circuit of the locomotive. According to the power supply waveform measurement of the relay, ground simulation test, combined with the characteristics of relay failure, we analyze that because the locomotive I terminal heavy-haul wire harness is close to the high-voltage cable at terminal cabinet 1, when the pantograph rises and the main break closes, the magnetic field of high-voltage current in the high-voltage cable will interfere with the lower heavy-haul circuit. At the same time, because the control of heavy-haul relay is the negative terminal control of heavy-haul wire harness, when the main break closes, the high-voltage magnetic field will form positive interference to the negative terminal circuit of the relay. According to the actual measurement, the 0 potential of the negative terminal to the ground is more than 380V in the interference moment, which is much higher than the DC 110V power supply of the positive terminal, so that a potential difference is formed between the coils, and the coil is reversely connected and moves. The root cause of the problem is the interference and the design of the rectifier bridge in the front part of the imported relay of the original vehicle, so there is no positive and negative terminals relative to the control coil of the relay, so when the input end of the rectifier bridge appears power surge, the coil will move.

[0033] According to the measured waveform, the waveform of the relay negative end circuit at the moment of main disconnection and connection is an up-and-down fluctuating non-fixed waveform, and the voltage peak value is high. According to the actual measurement result analysis, in the online use of the locomotive, under the condition of passing through the phase more severely, the interference of the relay negative end is likely to exceed 600V. When the voltage of the relay negative end exceeds 600V, the pulse voltage borne by the cathode of the diode of the relay rectifier bridge is likely to cause the diode to break down. The burnout phenomenon of a large number of fault relay rectifiers in the field confirms that the interference voltage exceeds 600V, such as Figure 4 as shown in the example, Figure 4 is a schematic diagram of the interference point of the high-voltage circuit to the control circuit. In the example shown in Figure 4 , there is interference at 1023A of the A car and interference at 1023B of the B car.

[0034] When the HXD3C locomotive is used in the 1-end heavy coupling mode, both the locomotives are lifted by 1 bow, and the current introduced from the catenary of the corresponding locomotive is transmitted to the main transformer of the locomotive through the 1-end heavy coupling mode. As can be seen from the previous fault statistics, the heavy coupling fault of the HXD3C locomotive in the 1-end heavy coupling mode is very high, which also shows that the control of the high-voltage cable to the terminal cabinet 1 and the heavy coupling network wire harness constitute an interference. In the wiring of the heavy coupling circuit and the high-voltage circuit, the red line represents the I-end heavy coupling line path, the green line represents the II-end heavy coupling line path, and the brown line represents the high-voltage cable path. In the wiring of the heavy coupling circuit and the high-voltage circuit, the wiring of the heavy coupling circuit and the high-voltage circuit mainly involves the wiring of the microcomputer cabinet, the power supply cabinet 1, the converter cabinet 1, the dryer 1, the control electric appliance cabinet, the high-voltage electric appliance cabinet, the converter cabinet 2, the power supply cabinet 2, the air pipe cabinet, the dryer 2, the terminal cabinet 1, and the air compressor, etc.

[0035] Therefore, the scheme of the utility model provides a DC conversion device of a microcomputer control circuit of an HXD3C locomotive, in particular to a microcomputer heavy coupling relay full-wave modification structure of an HXD3C locomotive, which combines the characteristics of the bridge rectifier (i.e. the characteristics of the non-polarity of the input power supply) and the DC 110V condition of the locomotive control circuit, removes the rectifier bridge at the end of the top relay, and replaces it with two high-power diodes. In this way, the problem of the zero line being interfered by the pulse signal and then connecting the relay coil in the rectifier bridge control is mainly solved, and the anti-interference function of the relay coil power supply is realized.

[0036] According to the embodiment of the utility model, a DC conversion device of a microcomputer control circuit of an HXD3C locomotive is provided. Referring to Figure 1The utility model discloses an embodiment structure schematic diagram of the device. In the scheme of the utility model, the microcomputer control circuit of HXD3C type locomotive, include: the relay of reconnection;The direct current conversion device of microcomputer control circuit of HXD3C type locomotive is set up in the power side of relay of reconnection;The direct current conversion device of microcomputer control circuit of HXD3C type locomotive includes: diode module;Wherein, the power side of relay of reconnection is connected to the coil of relay of reconnection after diode module;The coil of relay of reconnection is used to control the opening or closure of the contact of relay of reconnection to realize the control of the energization of microcomputer control circuit of HXD3C type locomotive or not.

[0037] The utility model discloses a kind of microcomputer relay of reconnection full-wave reconstruction structure of HXD3C type locomotive in the scheme of the utility model, remove rectifier bridge in the end of locomotive top relay, replace with high-power diode, solve the problem that relay coil is connected after zero line is interfered by pulse signal in rectifier bridge control, realize the function of relay coil power anti-interference, improve the operation safety of locomotive.

[0038] In some embodiments, the diode module includes: a first diode and a second diode;Wherein, the power side of the relay of reconnection is connected to the coil of the relay of reconnection after the first diode and the second diode, respectively.

[0039] In the scheme of the utility model, remove rectifier bridge in the end of locomotive top relay, replace with two high-power diodes to solve the problem that relay coil is connected after zero line is interfered by pulse signal in rectifier bridge control, realize the function of relay coil power anti-interference, improve the operation safety of locomotive. Preferably, high-power diode uses 1000V / 4A diode.

[0040] In some embodiments, in the case that the power supply on the power side is a direct current power supply, the direct current power supply is connected to the anode of the first diode;The cathode of the first diode is connected to the first connection end of the coil of the relay of reconnection;The direct current power supply is also connected to the anode of the second diode;The cathode of the second diode is connected to the second connection end of the coil of the relay of reconnection.

[0041] In the scheme of the utility model, in the case that the power supply on the power side of the microcomputer control circuit of HXD3C type locomotive is a direct current power supply, the first diode and the second diode are arranged between the power side and the coil of the relay of reconnection, without affecting the reliable and safe power supply to the microcomputer control circuit of HXD3C type locomotive.

[0042] In some embodiments, when the power supply on the power supply side is an AC power supply, the live wire of the AC power supply is connected to the anode of the first diode; the cathode of the first diode is connected to the first connection terminal of the coil of the reconnection relay; the neutral wire of the AC power supply is also connected to the anode of the second diode; and the cathode of the second diode is connected to the second connection terminal of the coil of the reconnection relay.

[0043] In the present invention, when the power supply of the microcomputer control circuit of the HXD3C locomotive is AC power, the first diode and the second diode are provided between the power supply side and the coil of the reconnection relay to block the interference power in the neutral wire, so as to protect the relay and prevent the relay from malfunctioning.

[0044] In some implementations, the power of the first diode and the power of the second diode are both above a preset power threshold, which can improve the anti-interference capability of the relay.

[0045] Figure 5 This is a schematic diagram of the modified full-wave rectifier circuit. A1 represents power supply +, A2 represents power supply -, and B1 and B2 both represent relay coil leads. In the solution of this utility model, as... Figure 5 As shown, considering the characteristics of bridge rectifier (the input power supply is not polarity-sensitive) and the fact that the locomotive control circuit is DC110V, the rectifier bridge at the relay end in the microcomputer control circuit of the HXD3 locomotive is removed and replaced with two high-power diodes (such as diode V1 and diode V2). This mainly solves the problem of the relay coil being connected after the neutral line is subjected to pulse interference signal in the rectifier bridge control, and realizes the anti-interference function of the relay coil power supply.

[0046] exist Figure 5 In the example shown, terminal A1 is connected to the anode of diode V1, and the cathode of diode V1 is connected to the lead B1 of the coil; terminal A2 is connected to the cathode of diode V2, and the anode of diode V1 is connected to the lead B2 of the coil.

[0047] Figure 6 This is a schematic diagram of the rectifier bridge structure. (Example:) Figure 6 As shown, the rectifier bridge consists of a first diode, a second diode, a third diode, and a fourth diode. The anode of the first diode is connected to the cathode of the fourth diode, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the cathode of the third diode, and the anode of the third diode is connected to the anode of the fourth diode.

[0048] like Figure 6As shown, in a group of control circuit, the positive pole of input power DC110V is connected to the anode of the first diode in the rectifier bridge, the cathode of the first diode and the cathode of the second diode in the rectifier bridge are connected to the first connecting end of the DC coil (i.e. the coil of the relay), the anode of the third diode and the anode of the fourth diode in the rectifier bridge are connected to the second connecting end of the DC coil (i.e. the coil of the relay). The negative pole of DC110V is connected to the grounding point, and the negative pole of DC110V is also connected to the cathode of the third diode through the contact of the relay. The first connecting end of the coil of the high voltage transformer is connected to the grounding point, and the second connecting end of the coil of the high voltage transformer is connected to AC25KV high voltage. Among them, there is interference clutter between the grounding point of the first connecting end of the coil of the high voltage transformer and the grounding point of the negative pole of DC110V.

[0049] In another group of control circuit, the positive pole of input power DC110V is connected to the anode of the first diode in the rectifier bridge, the cathode of the first diode and the cathode of the second diode in the rectifier bridge are connected to the first connecting end of the DC coil (i.e. the coil of the relay), the anode of the third diode and the anode of the fourth diode in the rectifier bridge are connected to the second connecting end of the DC coil (i.e. the coil of the relay). The negative pole of DC110V is connected to the grounding point, and the negative pole of DC110V is also connected to the cathode of the third diode through the contact of the relay. The first connecting end of the coil of the high voltage transformer is connected to the grounding point, and the second connecting end of the coil of the high voltage transformer is connected to AC25KV high voltage. Among them, there is interference clutter between the grounding point of the first connecting end of the coil of the high voltage transformer and the grounding point of the negative pole of DC110V.

[0050] In a group of control circuit and another group of control circuit, there is interference clutter between the connecting end of the relay and the connecting end of the rectifier bridge in one group of control circuit and the connecting end of the relay and the connecting end of the rectifier bridge in another group of control circuit.

[0051] HXD3 series locomotive microcomputer reconnection relay in the control, adopts DC110V DC control, under normal circumstances, the input power of the relay rectifier bridge or diode is DC, and the action of the relay will not be different. However, through the test, it is proved that HXD3C type locomotive will produce interference to the DC100V control circuit of the locomotive when the high voltage alternating current (AC25KV) changes due to the circuit design problem. Specifically as follows:

[0052] (1) if the relay input adopts rectifier bridge, under the rectification characteristics of the rectifier bridge, the high voltage interference of the middle pulse of the control negative circuit (the middle live wire) Figure 6 of the rectifier bridge will be output to the control line of the load of the output coil (the negative load) Figure 6 , resulting in the error action of the relay.

[0053] (2) Figure 7The schematic diagram of the blocking characteristic of diode. The rectifier bridge at the end of the relay is replaced by two diodes. The interference power in the zero line is prevented by the reverse blocking characteristic of the diodes (as shown in Figure 7

[0054] As shown in Figure 6 , in a set of control circuits, the positive pole of the input power DC110V is connected to the anode of diode V1, the cathode of diode V1 is connected to the anode of diode V2 through the DC coil (i.e. the coil of the relay), and the cathode of diode V2 is connected to the negative pole of the input power DC110V through the contact of the relay. The negative pole of the input power DC110V is connected to the ground. The first connection end of the coil of the high voltage transformer is connected to the ground, and the second connection end of the coil of the high voltage transformer is connected to the AC25KV high voltage power. There is interference clutter between the ground of the first connection end of the coil of the high voltage transformer and the ground of the negative pole of the DC110V.

[0055] In another set of control circuits, the positive pole of the input power DC110V is connected to the anode of diode V1, the cathode of diode V1 is connected to the anode of diode V2 through the DC coil (i.e. the coil of the relay), and the cathode of diode V2 is connected to the negative pole of the input power DC110V through the contact of the relay. The negative pole of the input power DC110V is connected to the ground. The first connection end of the coil of the high voltage transformer is connected to the ground, and the second connection end of the coil of the high voltage transformer is connected to the AC25KV high voltage power. There is interference clutter between the ground of the first connection end of the coil of the high voltage transformer and the ground of the negative pole of the DC110V.

[0056] In a set of control circuits and another set of control circuits, there is interference clutter between the connection end of the relay and diode V2 in one set of control circuits and the connection end of the relay and diode V2 in another set of control circuits.

[0057] In Figure 7 the example shown, the positive pole of the DC110V power supply is connected to the anode of diode V1; the cathode of diode V1 is connected to the first connection end of the DC coil (i.e. the coil of the relay); the negative pole of the DC110V power supply is grounded; the negative pole of the DC110V power supply is also connected to the cathode of diode V2; the anode of diode V2 is connected to the second connection end of the DC coil (i.e. the coil of the relay), which can prevent the negative pole of the DC110V power supply from being disturbed by pulses, and the high voltage surge current of the AC25KV high voltage power supply at the moment of switching can enter the heavy-duty relay through the ground connection point and the negative end of the control circuit, and then break through the rectifier diode of the relay and the normally closed contact.

[0058] ​Through a large number of experiment verification, adopting the technical scheme of the utility model, through the microcomputer reconnection relay of the locomotive, two diodes are arranged to replace the rectifier bridge on the top of the reconnection relay, so that the rectifier bridge on the end of the reconnection relay of the microcomputer control circuit in the HXD3C locomotive is replaced by two diodes, the anti-interference ability of the reconnection relay can be improved, the reconnection communication fault can be avoided, and the safety of the HXD3C locomotive operation is improved.

[0059] In conclusion, those skilled in the art can understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0060] The above only describes the embodiments of the utility model and is not used to limit the utility model, and the utility model can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the scope of claims of the utility model.

Claims

1. A DC converter for a microcomputer control circuit of a HXD3C type locomotive, characterized in that, The microcomputer control circuit of the HXD3C locomotive comprises: a recombination relay; a direct current conversion device of the microcomputer control circuit of the HXD3C locomotive, which is arranged at a power supply side of the recombination relay; the direct current conversion device of the microcomputer control circuit of the HXD3C locomotive comprises: a diode module; wherein The power supply side of the recombination relay is connected to a coil of the recombination relay through the diode module; the coil of the recombination relay is used to control opening or closing of contacts of the recombination relay, so as to control whether the microcomputer control circuit of the HXD3C locomotive is powered or not; The diode module comprises: a first diode and a second diode; wherein the power supply side of the recombination relay is connected to the coil of the recombination relay through the first diode and the second diode respectively; In the case that the power supply at the power supply side is a direct current power supply, the direct current power supply is connected to an anode of the first diode; a cathode of the first diode is connected to a first connection end of the coil of the recombination relay; the direct current power supply is also connected to an anode of the second diode; a cathode of the second diode is connected to a second connection end of the coil of the recombination relay; Or, in the case that the power supply at the power supply side is an alternating current power supply, a live wire of the alternating current power supply is connected to the anode of the first diode; the cathode of the first diode is connected to the first connection end of the coil of the recombination relay; a zero line of the alternating current power supply is also connected to the anode of the second diode; the cathode of the second diode is connected to the second connection end of the coil of the recombination relay.

2. The DC converter of the microcomputer control circuit of the HXD3C type locomotive according to claim 1, characterized in that, The power of the first diode and the power of the second diode are both above a preset power threshold.

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