Train power supply cabinet of electric locomotive

[0032] Example one:

[0033] Aiming at the defect that the existing train power supply cabinets of electric locomotives cannot meet the increasing power consumption requirements of electric loads, the present invention provides a new train power supply cabinet for electric locomotives. figure 1 The schematic diagram of the structure of the train power supply cabinet of the electric locomotive provided by this embodiment is shown.

[0034] Such as figure 1 As shown, the train power supply cabinet 101 provided in this embodiment includes a first switch 102 and at least three power supply branches with the same structure (for example, power supply branch 103a, power supply branch 103b, ..., power supply branch 103n, etc.). One end of the first switch 102 is connected to the AC input power source 100 (such as a silicon unit, etc.), and the other end is connected to each power supply branch through each port, so as to switch the required power supply branch from each power supply branch. As a conducting branch, it is connected to the AC input power source 100. The power supply branch connected to the AC power supply, that is, the conduction branch, can convert the input AC power supply into a DC power supply for output, thereby ensuring the normal power supply to the electric locomotive.

[0035] For example, the current conducting branches are the power supply branch 103a and the power supply branch 103b, and when the power supply branch 103a is abnormal, the first switch 102 can cut out the power supply branch 103a and cut the power supply branch 103n in. Because the power supply branch 103n and the power supply branch 103a have the same structure and performance, the power supply cabinet has the same capacity for power conversion and output after switching, thereby ensuring the normal power supply to the electric load of the electric locomotive.

[0036] At the same time, in an embodiment of the present invention, multiple power supply branches can also be used to supply power to the electrical load at the same time, which helps to reduce the performance requirements of each power supply branch and expand the components in each power supply branch. The range of model selection can help reduce the cost of the power supply cabinet, reduce the failure rate of the power supply cabinet, and improve the reliability of the power supply cabinet.

[0037] Because the existing electric locomotives have a large number of electric loads, and different electric loads have different power requirements. For example, some electric loads need AC power to drive, while some electric loads need DC power to drive . The output of the conduction branch provided in this embodiment is direct current, so in order to provide power to some electrical equipment driven by alternating current, the train power supply cabinet provided in this embodiment further includes a second switch 104 and an inverter unit 105.

[0038] Such as figure 1 As shown, one end of the second switch 104 is correspondingly connected to each power supply branch through each port, and the other end is connected to the inverter unit 105. The second changeover switch 104 can switch out a branch for supplying power to the inverter device 105 (that is, an AC power supply branch) from each conductive branch. The inverter unit 105 receives the direct current transmitted from the second switch 104, converts the direct current into alternating current, and outputs it to the corresponding electrical load, thereby driving the electrical load to operate normally.

[0039] It should be noted that the second switch and the inverter unit can be configured according to the electric load of the electric locomotive. For example, for electric loads that do not require AC power supply, they can be directly provided by the DC power supply provided by each conduction branch. For some electric loads that require AC power supply, the second switch and inverter unit can be configured accordingly to obtain the required AC power to power these electric loads. The present invention is not limited to this.

[0040] In addition, because the AC power supply required by different electrical loads may also be different, in other embodiments of the present invention, multiple AC power supply branches composed of a switch and an inverter unit can also be configured. Different electrical loads are supplied with power. The alternating current output by each AC power branch can be configured with different inverter unit parameters to output the required alternating current, thereby realizing power supply to multiple alternating current loads at the same time. The present invention is not limited to this.

[0041] In this embodiment, the function of each power supply branch is to convert the input AC power into DC power for output. Because the current structure of each power supply branch is the same, the following is figure 2 The circuit structure diagram of one of the power supply branches is shown as an example to further explain the working principle and process of each power supply branch.

[0042] Such as figure 2 As shown, the power supply branch provided in this embodiment includes a second filter circuit 201, a rectifier circuit 202, a reactor 203, and a first filter circuit 204. Wherein, the second filter circuit 201 is connected to the first switch 102 and is used to filter the AC power provided by the AC input power transmitted from the first switch. The rectifier circuit 202 is connected to the second filter circuit 201, and is used to convert the filtered alternating current transmitted from the second filter circuit 201 into direct current and output it. The reactor 203 and the second filter circuit 204 are connected in series at the output end of the rectifier circuit 202, and are used to filter the DC power output by the rectifier circuit to improve the quality of the DC power, thereby ensuring reliable power supply to the electric load of the electric locomotive.

[0043] It can be seen from the above description that in this embodiment, the number of reactors is equal to the number of power supply branches, so that each power supply branch includes a reactor. However, in other embodiments of the present invention, a reasonable circuit structure can also be used, such as connecting each reactor with the power supply branch through a third switch, and through the switching and conduction of the third switch, each reactor Connect with the conduction branch. Since the conduction branch is switched from each power supply branch, and its number is less than the total number of power supply branches, the number of reactors that need to be configured is also less than the total number of power supply branches. This effectively reduces the number of reactors used, reduces the volume of the entire power supply cabinet, reduces the cost of the power supply cabinet, and improves market competitiveness.

[0044] In this embodiment, the AC input power supply 100 provides two-phase AC power, so the first switch is a double-pole switch. Because for each power supply branch, the connection state of its input terminal and the AC input power supply 100 is the same (that is, connected or disconnected at the same time), the use of a double-pole switch can simplify the control process, which helps reduce The failure rate of the entire power supply cabinet improves the reliability of the power supply cabinet.

[0045] Based on the above principles, the second switch can also be a double-pole switch. Of course, in other embodiments of the present invention, the first switch and/or the second switch can also be other reasonable forms of switches, and the present invention is not limited to this.

[0046] It can be seen from the above description that the train power supply cabinet for electric locomotives provided in this embodiment is provided by setting at least three power supply branches with the same structure, and using a switch to switch the required power supply branches from these power supply branches. The circuit serves as a conducting branch to supply power to the electric load of the electric locomotive, which improves the output capacity of the power supply cabinet. When an abnormality occurs in one or several power supply branches, the power supply cabinet can maintain the same output capacity, thereby ensuring the normal power supply to each electrical load.

[0047] Embodiment two:

[0048] image 3 Shows the circuit schematic diagram of the train power supply cabinet for electric connection provided by this embodiment.

[0049] It can be seen from the figure that the train power supply cabinet provided in this embodiment includes three power supply branches with the same structure, namely, the power supply branch 103a, the power supply branch 103b, and the power supply branch 103c. In this embodiment, the power supply branch 103a and the power supply branch 103b are used as the default power supply branch, and the power supply branch 103c is the backup power supply branch. When the power supply branch 103a or the power supply branch 103b fails, the failed power supply The branch circuit is cut out, and the power supply branch circuit 103c, which is the backup power supply branch, is cut in, thus ensuring that the power supply branch circuit in the working state of the train power supply cabinet still has two circuits, so that the performance of the train power supply cabinet remains unchanged, thereby ensuring the external The normal power supply of the electric load.

[0050] Specifically, such as image 3 As shown, the changeover switches used in this embodiment are all double-pole three-position switches. Wherein, the E port of the switch K1 is connected to the positive output terminal of the first power supply winding (ie, the a8 port), and the F port is connected to the negative output terminal of the power supply winding (ie, the x8 port). The E1 port and F1 port of the switch K1 are respectively connected to the two ports of the input end of the power supply branch 103b, the E2 port and the F2 port are respectively connected to the two ports of the input end of the power supply branch 103a, and the E1 port of the switch K1 The state is the same as that of the F1 port, E2 port and F2 port, that is, simultaneous conduction or simultaneous port.

[0051] Therefore, in this embodiment, when the switch K1 is in the first state, that is, when the E port and the F port are respectively connected to the E1 port and the F1 port, the two input ports G11 and G12 of the power supply branch 103b are connected to the power supply windings. The a8 port and the x8 port are connected, so that the AC power provided by the AC input power is transmitted to the power supply branch 103b.

[0052] When the switch K1 is in the second state, that is, when the E port and the F port are respectively connected to the E2 port and the F2 port, the two input ports G31 and G32 of the power supply branch 103a are respectively at the a8 port and the x8 port of the power supply winding. In this way, the AC power provided by the AC input power source is transmitted to the power supply branch 103a.

[0053] When the switch K1 is in the third state, the E port and the F port are in a floating state. At this time, the power supply branch 103a and the power supply branch 103b have no power input.

[0054] Such as image 3 As shown, the E port of the switch K4 is connected to the positive output end of the second power supply winding (ie, the a9 port), and the F port is connected to the negative output end of the power supply winding (ie, the x9 port). The E1 port and F1 port of the switch K4 are respectively connected to the two ports of the input end of the power supply branch 103c, the E2 port and the F2 port are respectively connected to the two ports of the input end of the power supply branch 103a, and the E1 port of the switch K4 The state is the same as that of the F1 port, E2 port and F2 port, that is, simultaneous conduction or simultaneous port.

[0055] Similar to the switch K1, the switch K4 can also connect the power supply branch 103a or the power supply branch 103c with the AC input power, and can also make the power supply branch 103a and the power supply branch 103c be in a state of no power input.

[0056] As can be seen from the above description, in this embodiment, the power supply branch 103b and the power supply branch 103c are used as the default power supply branch. When one of the two power supply branches is abnormal, the switch K1 or the switch According to the corresponding action of K4, the abnormal power supply branch is cut out, and the backup power supply branch 103a is cut in, thus ensuring that the power supply branch of the train power supply cabinet is still in working condition, so that the performance of the train power supply cabinet is not maintained. Change, thereby ensuring the normal power supply to external electrical loads.

[0057] The following takes the power supply branch 103a as an example to further explain the principle and process of AC-DC conversion of each power supply branch.

[0058] Such as image 3 As shown, in this embodiment, when the connection between the power supply branch 103a and the AC input power is turned on, the input end of the power supply branch 103a receives the AC power provided by the AC input power, and transmits the AC power to the second filter The circuit is filtered by the second filter circuit.