Locomotive emergency power supply system

Abstract

The embodiment of the application discloses a locomotive emergency power supply system, which is used for outputting high-quality sine voltage waveform when the locomotive is in emergency power supply. The system comprises a host computer, a direct current power supply, a single-phase inverter, a first controller, a first filter and a second filter. The direct current power supply is connected in series with the single-phase inverter, and the first filter and the second filter are connected in parallel. The host computer is connected with the first controller in signal connection. The first controller closes the first filter and disconnects the second filter when receiving a first control signal of the host computer. The first controller closes the second filter and disconnects the first filter when receiving a second control signal of the host computer. The single-phase inverter is connected in series with the first filter or the second filter, and is connected with a corresponding locomotive power supply circuit through the first filter and the second filter.

Description

Technical Field

[0001] This application relates to the field of railway locomotive power supply technology, and in particular to an emergency power supply system for locomotives. Background Technology

[0002] The auxiliary power supply system of Shenhua series (e.g., HXD1) AC drive electric locomotives and SS series (e.g., SS4B) DC drive electric locomotives is a crucial component, providing power to all auxiliary motors and various equipment in the driver's cab. In recent years, locomotive emergency auxiliary power supply systems have been developed, using lithium-ion batteries as energy storage components and combined with power electronic converters to achieve emergency auxiliary power supply. This is an important supplement to the locomotive auxiliary power supply system, enabling comprehensive auxiliary power supply covering all operating conditions, without dead zones or power islands.

[0003] However, when an electric locomotive is without overhead contact line, the contact line is de-energized, and the pantograph cannot be raised to collect current, the original auxiliary power supply system cannot supply power to the auxiliary electrical equipment (locomotive auxiliary electrical appliances) in the locomotive driver's cab. The onboard locomotive emergency power supply system's single-phase inverter is required to provide full power. However, the sinusoidal voltage waveform generated by the single-phase inverter contains high-order harmonics and cannot output a high-quality sinusoidal voltage waveform. Therefore, there is a problem that a high-quality sinusoidal voltage waveform cannot be output during locomotive emergency power supply. Utility Model Content

[0004] The purpose of this application is to provide a locomotive emergency power supply system that outputs a high-quality sinusoidal voltage waveform.

[0005] To solve the above-mentioned technical problems, the embodiments of this application are implemented as follows: In a first aspect, embodiments of this application provide a locomotive emergency power supply system, characterized in that the system comprises: a host computer, a DC power supply, a single-phase inverter, a first controller, a first filter, and a second filter. The DC power supply is connected in series with the single-phase inverter, and the first filter and the second filter are connected in parallel. The host computer is signal-connected to the first controller. When the first controller receives a first control signal from the host computer, it closes the first filter and opens the second filter; when it receives a second control signal from the host computer, the first controller closes the second filter and opens the first filter. The single-phase inverter is connected in series with the first filter or the second filter, and is connected to the corresponding locomotive power supply circuit through the first filter and the second filter.

[0006] The locomotive emergency power supply system provided in this application includes: a host computer, a DC power supply, a single-phase inverter, a first controller, a first filter, and a second filter. The DC power supply and the single-phase inverter are connected in series, and the first filter and the second filter are connected in parallel. The host computer is signal-connected to the first controller. When the first controller receives a first control signal from the host computer, it closes the first filter and opens the second filter. When it receives a second control signal from the host computer, it closes the second filter and opens the first filter. It is known that the first filter and the second filter are connected in series, and they do not close simultaneously. When the first filter is closed, the second filter is open; when the first filter is open, the second filter is closed. The first and second filters are closed, and their closed / open states are controlled by the first controller receiving control signals sent from the host computer. Different control signals can control different filters to open or close. The single-phase inverter is connected in series with the first or second filter, and is connected to the corresponding locomotive power supply circuit through the first and second filters. It can be seen that the first and second filters are connected in parallel, and only one of the first and second filters is in the closed state. Therefore, the single-phase inverter can only be connected to one of the first and second filters at the same time. Thus, the voltage output by the single-phase inverter is filtered through the connected filter, and a high-quality sinusoidal voltage waveform can be output. Attached Figure Description

[0007] Figure 1 This is a schematic block diagram of a locomotive emergency power supply system provided in an embodiment of this application; Figure 2A This is a schematic block diagram of a locomotive emergency power supply system provided in an embodiment of this application; Figure 2B This is a schematic block diagram of another locomotive emergency power supply system provided in the embodiments of this application; Figure 2C This is a schematic diagram of a filter circuit provided in an embodiment of this application; Figure 3A This is a schematic block diagram of a single-phase inverter provided in an embodiment of this application; Figure 3B This is a schematic diagram of the structure of a single-phase inverter circuit provided in an embodiment of this application; Figure 4 This is a schematic block diagram of another locomotive emergency power supply system provided in the embodiments of this application; Figure 5 This is a schematic block diagram of another locomotive emergency power supply system provided in the embodiments of this application; Figure 6A This is a schematic block diagram of another locomotive emergency power supply system provided in the embodiments of this application; Figure 6B This is a schematic diagram of the structure of an emergency power supply circuit for a locomotive provided in an embodiment of this application. Detailed Implementation

[0008] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0009] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0010] Figure 1 This is a schematic block diagram of a locomotive emergency power supply system according to an embodiment of this application, such as... Figure 1 As shown, the system includes: a host computer 11, a DC power supply 12, a single-phase inverter 13, a first controller 14, a first filter 15, and a second filter 16.

[0011] The DC power supply 12 is connected in series with the single-phase inverter 13, and the first filter 15 and the second filter 16 are connected in parallel.

[0012] DC power supply 12 is a module that can provide DC power, including a positive power supply terminal and a negative power supply terminal. It is connected to a single-phase inverter and is used to input a stable DC voltage or DC power supply to the single-phase inverter 13.

[0013] The single-phase inverter 13 is a module that converts direct current (DC) to single-phase alternating current (AC). It typically includes full-bridge inverters, plate-bridge inverters, push-pull inverters, single-ended inverters, and multi-level inverters. The single-phase inverter 13 can convert the DC power supplied by the DC power source 12 into AC power.

[0014] The first controller 14 is a control module that can control the opening and closing of the single-phase inverter 13 and the first filter 15, as well as the opening and closing of the single-phase inverter 13 and the second filter 16. However, when the first controller 14 controls the connection between the single-phase inverter 13 and the first filter 15 or the second filter 16, it can only connect one of the first filter 15 or the second filter 16 at the same time.

[0015] Specifically, when the first controller 14 connects the single-phase inverter 13 to the first filter 15, the first controller 14 can connect the single-phase inverter 13 to the first filter 15 so that the first filter 15 can filter harmonics from the AC voltage output by the single-phase inverter 13. When the first controller 14 connects the single-phase inverter 13 to the second filter 16, the first controller 14 can connect the single-phase inverter 13 to the second filter 16 so that the second filter 16 can filter harmonics from the AC voltage output by the single-phase inverter 13. Furthermore, when the single-phase inverter 13 inverts DC power into AC power, the output AC voltage can change. When the output AC voltage is different, the host computer 11 can select the corresponding filter for harmonic filtering according to the different output AC voltages, thereby ensuring a high-quality output AC voltage.

[0016] Both the first filter 15 and the second filter 16 are modules for harmonic filtering of AC voltage. They contain different capacitors and inductors, therefore, their filtering quality differs depending on the value of the AC voltage's harmonics. When the first filter 15 is connected to the single-phase inverter 13, they are connected in series; when the second filter 16 is connected to the single-phase inverter 13, they are connected in series.

[0017] The host computer 11 is connected to the first controller 14 via a signal. The host computer 11 can be a computer or other device terminal. It can send a first control signal and a second control signal to the first controller 14, so that the first controller 14 sends a first control sub-signal or a second control sub-signal corresponding to the first control signal to the single-phase inverter 13. The first control sub-signal is used to instruct the single-phase inverter 13 to connect with the first filter 15, and the second control sub-signal is used to instruct the single-phase inverter 13 to connect with the second filter 16.

[0018] The first control signal is a signal instructing the first controller 14 to connect the single-phase inverter 13 to the first filter 15. According to the first control signal, the single-phase inverter 13 connects to the first filter 15 and disconnects from the second filter 16. The second control signal is a signal instructing the first controller 14 to connect the single-phase inverter 13 to the second filter 16. According to the second control signal, the single-phase inverter 13 connects to the second filter 16 and disconnects from the first filter 15.

[0019] Specifically, in the initial state, the single-phase inverter 13 is not connected to either the first filter 15 or the second filter 16. When the first controller 14 receives the first control signal from the host computer 11, it controls the single-phase inverter 13 to connect to the first filter 15. When the first controller 14 receives the second control signal from the host computer 11, it controls the single-phase inverter 13 to connect to the second filter 16. When the single-phase inverter 13 is connected to the first filter 15 and the first controller 14 receives the second control signal from the host computer 11, the first controller 14 controls the single-phase inverter 13 to connect to the second filter 16 and disconnect the first filter 15. When the single-phase inverter 13 is connected to the second filter 16 and the first controller 14 receives the first control signal from the host computer 11, the first controller 14 controls the single-phase inverter 13 to connect to the first filter 15 and disconnect the second filter 16.

[0020] Furthermore, the inductor and capacitor parameters of the first filter 15 and the second filter 16 are different. The host computer generates a first control signal and a second control signal based on the AC voltage value and frequency output by the single-phase inverter. That is, according to different AC voltage values ​​and frequencies, it determines the inductor and capacitor parameters of the filter that match the AC voltage value and frequency, and then determines whether to send the first control signal or the second control signal to the single-phase inverter, so that the connected filter can perform high-quality harmonic filtering on the AC voltage output by the single-phase inverter.

[0021] The locomotive power supply circuit 110 supplies power to equipment in the locomotive, such as air conditioners, hair dryers, and water heaters. A single-phase inverter 13 is connected in series with either the first filter 15 or the second filter 16, and is connected to the locomotive power supply circuit 110 corresponding to filter 16 via the first filter 15 and the second filter. Therefore, when the single-phase inverter 13 is connected to the first filter 15, the single-phase inverter 13 is connected in series with the first filter 15, and the first filter 15 is connected in series with the locomotive power supply circuit 110; when the single-phase inverter 13 is connected to the second filter 16, the single-phase inverter 13 is connected in series with the second filter 16, and the second filter 16 is connected in series with the locomotive power supply circuit 110. Both the first filter 15 and the second filter 16 are connected to an auxiliary power supply circuit, ensuring that the equipment in the locomotive power supply circuit 110 can be powered regardless of whether the single-phase inverter 14 is connected to either the first filter 15 or the second filter 16.

[0022] The locomotive emergency power supply system provided in this application embodiment includes: a host computer 11, a DC power supply 12, a single-phase inverter 13, a first controller 14, a first filter 15, and a second filter 16. The DC power supply 12 and the single-phase inverter 13 are connected in series, and the first filter 15 and the second filter 16 are connected in parallel. The host computer 11 is signal-connected to the first controller 14. When the first controller 14 receives a first control signal from the host computer 11, it closes the first filter 15 and opens the second filter 16. When it receives a second control signal from the host computer, the first controller closes the second filter 16 and opens the first filter 15. It can be seen that the first filter 15 and the second filter 16 are connected in series, and they will not close simultaneously. When the first filter 15 is closed, the second filter 16 is open. When the first filter 15 is open, the second filter 16 is closed. The opening and closing states of the first filter 15 and the second filter 16 are controlled by the first controller 14 receiving control signals sent by the host computer 11. Different control signals can control different filters to open or close. The single-phase inverter 13 is connected in series with the first filter 15 or the second filter 16, and is connected to the corresponding locomotive power supply circuit through the first filter 15 and the second filter 16. It can be seen that the first filter 15 and the second filter 16 are connected in parallel, and only one of the first filter 15 and the second filter 16 is in the closed state. Therefore, the single-phase inverter can only be connected to one of the first filter 15 and the second filter 16 at the same time. Thus, the voltage output by the single-phase inverter 13 is filtered through the connected filter, and a high-quality sinusoidal voltage waveform can be output.

[0023] In one embodiment, such as Figure 2AAs shown, the first filter 15 of the locomotive emergency power supply system includes a first switch 151, a first control inductor 152, a second switch 153, and a first control capacitor 154. The second filter 16 includes a third switch 161, a second control inductor 162, a fourth switch 163, and a second control capacitor 164. The first control inductor 152 and the second control inductor 162 are connected in series, and the first control capacitor 154 and the second control capacitor 164 are connected in parallel.

[0024] The first switch 151 is connected in parallel with the first control inductor 152, the third switch 161 is connected in parallel with the second control inductor 162, the second switch 153 is connected in series with the first control capacitor 154, and the fourth switch 163 is connected in series with the second control capacitor 164. When the first controller receives the first control signal, the first controller closes the first switch 151 and the second switch 153, and opens the third switch 161 and the fourth switch 163. When the first controller 14 receives the second control signal, the first controller closes the first switch 151, the second switch 153, the third switch 161, and the fourth switch 163.

[0025] The first switch 151, the second switch 153, the third switch 161 and the fourth switch 163 are switch modules, and the first controller 14 can control the closing and opening of the first switch 151, the second switch 153, the third switch 161 and the fourth switch 163.

[0026] The first control inductor 152 and the second control inductor 162 are inductor modules, and the first control capacitor 154 and the second control capacitor 164 are capacitor modules.

[0027] When the first controller 14 receives the first control signal, it controls the first switch 151 and the second switch 153 to close, and controls the third switch 161 and the fourth switch 163 to open. At this time, the first switch 151, the first control inductor 152, the second switch 153, and the first control capacitor 154 together form the first filter 15, which filters the AC voltage output by the single-phase inverter 13. When the first controller 14 receives the second control signal, it controls the first switch 151 and the second switch 153 to close, and controls the third switch 161 and the fourth switch 163 to close. At this time, the first switch 151, the first control inductor 152, the second switch 153, the first control capacitor 154, the third switch 161, the second control inductor 162, the fourth switch 163, and the second control capacitor 164 together form the second filter 16, which filters the AC voltage output by the single-phase inverter 13.

[0028] Specifically, the filter inductance parameter of the first control inductor 152 is 0.6mH, the filter inductance parameter of the second control inductor 162 is 0.6mH, the filter capacitance parameter of the first control capacitor 154 is 2.0μF, and the filter capacitance parameter of the second control capacitor 164 (which is the capacitor module) is 2.0μF. That is, when the first controller 14 receives the first control signal, the filter inductance parameter of the first filter 15 is the same as that of the first control inductor 152 (0.6mH), and the filter capacitance parameter is the same as that of the second control inductor 162 (0.6mH). When the first controller 14 receives the second control signal, the filter inductance parameter of the second filter 16 is the sum of the filter inductance parameters of the first control inductor 152 and the second control inductor 162 (0.6mH + 0.6mH = 1.2mH), and the filter capacitor parameter is the sum of the filter capacitor parameters of the first control capacitor 154 and the second control capacitor 164 (2.0μF + 2.0μF = 4.0μF).

[0029] In one embodiment, such as Figure 2B As shown, the locomotive emergency power supply system also includes a third filter 17. The third filter 17 includes a fifth switch 171, a third control inductor 172, a sixth switch 173, and a third control capacitor 174. The third control inductor 172 is connected in series with the second control inductor 173, and the third control capacitor 174 is connected in parallel with the second control capacitor 174. The fifth switch 171 is connected in parallel with the third control inductor 172, and the sixth switch 173 is connected in series with the third control capacitor 174. When the first controller receives the fourth control signal sent by the host computer, it closes the first switch 151, the second switch 153, the third switch 161, the fourth switch 163, the fifth switch 171, and the sixth switch 173.

[0030] like Figure 2CThe diagram shows the circuit structure of the first filter 15, the second filter 16, and the third filter 17. The AC voltage output by the single-phase inverter 13 is input from the input terminal and is output from the output terminal after being processed by the first filter 15, the second filter 16, or the third filter 17 for harmonic filtering. When the first switch 151 and the second switch 153 are closed, the filter circuit is configured as the first filter 15, with the first inductor 152 and the first capacitor 154 as the filter inductor. When the first switch 151, the second switch 153, the third switch 161, and the fourth switch 163 are closed, the filter circuit is configured as the second filter 16, with the first inductor 152 and the second inductor 162 as the filter inductors, and the first capacitor 154 and the second capacitor 164 as the filter capacitors. When the first switch 151, the second switch 153, the third switch 161, the fourth switch 163, the fifth switch 171, and the sixth switch 173 are closed, the filter circuit is configured as the third filter 17, with the first inductor 152, the second inductor 162, and the third inductor 172 as the filter inductors, and the first capacitor 154, the second capacitor 164, and the third capacitor 174 as the filter capacitors.

[0031] The fourth control signal is a signal sent by the host computer 11, which is used to instruct the first controller 14 to control the single-phase inverter 13 to connect with the third filter 17. According to the third control signal, the single-phase inverter 13 and the third filter 17 are connected.

[0032] The third control inductor 172 is an inductor module, and the third control capacitor 174 is a capacitor module. The first control inductor 152, the second control inductor 162, and the third control inductor 172 are connected in series, and the first control capacitor 154, the second control capacitor 164, and the third control capacitor 174 are connected in parallel.

[0033] When the first controller 14 receives the fourth control signal, the first controller 14 controls the first switch 151, the second switch 153, the third switch 161, the fourth switch 163, the fifth switch 171, and the sixth switch 173 to close. At this time, the first switch 151, the first control inductor 152, the second switch 153, the first control capacitor 154, the third switch 161, the second control inductor 162, the fourth switch 163, the second control capacitor 164, the fifth switch 171, the third control inductor 172, the sixth switch 173, and the third control capacitor 174 together form the third filter 17, and perform filtering operation on the AC voltage output by the single-phase inverter 13.

[0034] Specifically, the filter inductance parameter of the third control inductor 172 is 0.3mH, and the filter capacitance parameter of the third control capacitor 174 is 0.5μF. When the first controller 14 receives the fourth control signal, the filter inductance parameter of the third filter 17 is the sum of the filter inductance parameters of the first control inductor 152, the second control inductor 162, and the third control inductor 172 (0.6mH + 0.6mH + 0.3mH = 1.5mH), and the filter capacitance parameter is the sum of the filter capacitance parameters of the first control capacitor 154, the second control capacitor 164, and the third control capacitor (2.0μF + 2.0μF + 0.5μF = 4.5μF).

[0035] In this embodiment, the locomotive emergency power supply system generates different filters, i.e. filters with different filtering parameters, by controlling the closing and opening of multiple switches. This enables high-quality harmonic filtering for various AC voltage values ​​when the single-phase inverter outputs different AC voltages.

[0036] In one embodiment, the single-phase inverter 13 in the locomotive emergency power supply system is a full-bridge inverter 131, such as... Figure 3A The diagram shown is a schematic of a full-bridge inverter.

[0037] The full-bridge inverter 131 is a common power electronic converter topology used to convert direct current (DC) to alternating current (AC). The full-bridge inverter 131 consists of four switching transistors (first switching transistor 132, second switching transistor 133, third switching transistor 134, and fourth switching transistor 135) and three capacitors (first capacitor 136, second capacitor 137, and third capacitor 138).

[0038] One end of the full-bridge inverter 131 is connected in series with the DC power supply 12 to receive the DC voltage input from the DC power supply 12. The other end of the full-bridge inverter 131 is connected to an external filter, which is a first filter 15 and a second filter 16, i.e., the first filter 15 and the second filter 17 are connected in parallel, and then both are connected in series with the full-bridge inverter 131 to input the AC voltage generated by the inverter into the first filter 15 or the second filter 16 for filtering.

[0039] like Figure 3BThe diagram shows the circuit structure of a full-bridge inverter 131. A DC power supply 12 inputs DC voltage to the full-bridge inverter 131 through its input terminal. The full-bridge inverter 131 converts the DC voltage into AC voltage and outputs it through its output terminal. The full-bridge inverter includes a first switch 132, a second switch 133, a third switch 134, a fourth switch 135, a first capacitor 136, a second capacitor 137, and a third capacitor 138. The first switch 132 and the fourth switch 135 are a pair of complementary switches, and the second switch 133 and the third switch 134 are also a pair of complementary switches.

[0040] In one embodiment, such as Figure 4 As shown, the locomotive emergency power supply system also includes a second controller 18, a single-phase inverter 13 including multiple switching transistors, a host computer 11 connected to the second controller 18, and the second controller 18 receiving a third control signal sent by the host computer 11 to adjust the parameters of the multiple switching transistors.

[0041] The single-phase inverter 13 includes multiple switching transistors. The parameters of the switching transistors are closely related to the value and frequency of the AC voltage output by the single-phase inverter. Therefore, by adjusting the parameters of the multiple switching transistors in the single-phase inverter 13, the value and frequency of the AC voltage output by the single-phase inverter 13 can be adjusted.

[0042] The host computer 11 sends a third control signal to the second controller 18. This third control signal is used to control the second controller 18 to adjust the parameters of multiple switching transistors in the single-phase inverter 13, so as to adjust the AC voltage and frequency output by the single-phase inverter 13. That is, the host computer 11 adjusts the parameters of multiple switching transistors in the single-phase inverter 13 through the second controller 18, thereby realizing the adjustment of the AC voltage and frequency output by the single-phase inverter 13.

[0043] In one embodiment, such as Figure 1 As shown, the first controller 14 is connected to the single-phase inverter 13, which includes multiple switching transistors. When the first controller 14 receives a first control signal, it adjusts the parameters of the multiple switching transistors to the first parameter; when it receives a second control signal, it adjusts the parameters of the multiple switching transistors to the second parameter.

[0044] In the locomotive emergency power supply system, the switching parameters and filter opening / closing of the single-phase inverter 13 can be controlled by different controllers, or the same controller can control the switching parameters and filter opening / closing of the single-phase inverter 13. When the switching parameters and filter opening / closing of the single-phase inverter 13 are controlled by the same controller, the first controller 14, through connection with the single-phase inverter 13, can not only control the opening / closing state of the first filter 15 and the second filter 16, but also adjust the parameters of multiple switching transistors in the single-phase inverter 13.

[0045] Specifically, when the parameters of the switching transistors of the single-phase inverter 13 are different, the AC voltage value and frequency output by the single-phase inverter 13 will also be different. Therefore, when performing harmonic filtering on the different AC voltages output by the single-phase inverter 13, different filters are required.

[0046] The first parameter is the switching transistor parameter corresponding to the first filter 15. When the switching transistor parameter of the single-phase inverter 13 is the first parameter, the AC voltage and frequency output by it can obtain a high-quality harmonic voltage after harmonic filtering by the first filter 15. The second parameter is the switching transistor parameter corresponding to the second filter 16. When the switching transistor parameter of the single-phase inverter 13 is the second parameter, the AC voltage and frequency output by it can obtain a high-quality harmonic voltage after harmonic filtering by the second filter.

[0047] When the host computer 11 sends a first control signal to the first controller 14, the first controller 14 sets the switching transistor parameters of the single-phase inverter 13 to the first parameter, closes the first filter 15, and opens the second filter 16, so that the first filter 15 performs high-quality harmonic filtering on the AC voltage output by the single-phase inverter 13 when the switching transistor parameters of the single-phase inverter 13 are set to the first parameter. When the host computer 11 sends a second control signal to the first controller 14, the first controller 14 sets the switching transistor parameters of the single-phase inverter 13 to the second parameter, closes the second filter 16, and opens the first filter 15, so that the second filter 16 performs high-quality harmonic filtering on the AC voltage output by the single-phase inverter 13 when the switching transistor parameters of the single-phase inverter 13 are set to the second parameter.

[0048] In other words, the first controller 14 can control the switching parameters of the single-phase inverter 13 and the closed / open state of the filter so that the closed filter can perform high-quality harmonic filtering operation on the output AC voltage regardless of the AC voltage output by the single-phase inverter 13.

[0049] In this embodiment, the locomotive emergency power supply system adjusts the switching parameters of the single-phase inverter 13 and controls the opening and closing of the first filter 15 and the second filter 16 through the first control signal and the second control signal. When the switching parameters in the single-phase inverter 13 change, the AC voltage output by the single-phase inverter 13 is filtered by the filter corresponding to the changed switching parameters, so as to ensure that high-quality harmonic voltage can be output when the single-phase inverter 13 outputs different AC voltages.

[0050] In one embodiment, such as Figure 5 As shown, the locomotive emergency power supply system also includes a third filter 17. The first filter 15, the second filter 16 and the third filter 17 are connected in parallel. When the first controller 14 receives the fourth control signal sent by the host computer 11, it adjusts the switching tube parameters to the third parameter, closes the third filter 17, and disconnects the first filter 15 and the second filter 16.

[0051] The first filter 15, the second filter 16 and the third filter 17 are connected in parallel. When the first controller 14 receives the fourth control signal sent by the host computer 11, it controls the single-phase inverter 13 to connect with the third filter 17.

[0052] The fourth control signal is a signal sent by the host computer 11, which is used to instruct the first controller 14 to control the single-phase inverter 13 to connect with the third filter 17. According to the third control signal, the single-phase inverter 13 and the third filter 17 are connected.

[0053] When the first controller 14 receives the third control signal sent by the host computer 11, the first controller 13 controls the single-phase inverter 13 to disconnect the first filter 15 and the second filter 15, and close the third filter 17, so that the third filter 17 performs harmonic filtering on the AC voltage output by the single-phase inverter 13. The third parameter is the switching transistor parameter corresponding to the third filter 17. When the switching transistor parameter of the single-phase inverter 13 is the third parameter, the AC voltage and frequency output by it can obtain a high-quality harmonic voltage after harmonic filtering by the first filter 17.

[0054] In one embodiment, when the multiple switching transistors of the single-phase inverter 13 are set to the first parameter, the single-phase inverter outputs an AC voltage of 110V and a frequency of 25Hz; when the multiple switching transistors of the single-phase inverter are set to the second parameter, the single-phase inverter outputs an AC voltage of 220V and a frequency of 50Hz; and when the multiple switching transistors of the single-phase inverter are set to the third parameter, the single-phase inverter outputs an AC voltage of 255V and a frequency of 60Hz.

[0055] The output AC voltage and frequency differ depending on the parameters of the switching transistor in single-phase inverter 13. When the input DC voltage is 320V and the switching transistor parameter of single-phase inverter 13 is set to the first parameter, the output AC voltage after inversion is 110V with a frequency of 25Hz. When the input DC voltage is 320V and the switching transistor parameter of single-phase inverter 13 is set to the second parameter, the output AC voltage is 220V with a frequency of 50Hz. When the input DC voltage is 320V and the switching transistor parameter of single-phase inverter 13 is set to the third parameter, the output AC voltage is 255V with a frequency of 60Hz.

[0056] In one embodiment, the locomotive emergency power supply system further includes a boost chopper 19, one end of which is connected to a single-phase inverter 13 and the other end is connected to a DC power supply 12.

[0057] The boost chopper 19 is a module that increases the DC voltage. One end of the boost chopper 19 is connected to the DC power supply 12 to increase the DC voltage output by the DC power supply 12, for example, increasing the 110V DC voltage output by the DC power supply to 320V DC voltage. The other end of the boost chopper is connected to the single-phase inverter 13 to input the boosted DC voltage into the single-phase inverter 13 for inversion processing, so as to convert the 320V DC voltage into the required AC voltage.

[0058] In one embodiment, the locomotive emergency power supply system further includes a battery charging module 20, where the DC power supply 12 is a DC battery, and the charging module 20 is connected to the DC battery.

[0059] The battery charging module 20 is a charger used to charge the DC power supply 12. The battery charging module can be connected to an external AC power source and convert the AC power to DC voltage to charge the DC power supply 12.

[0060] The DC power supply 12 can be a DC battery, such as a lithium-ion battery pack, which is used to provide emergency power when the locomotive needs emergency power.

[0061] like Figure 6AAs shown, the battery charging module 20 is connected in series with the DC power supply 12, and is used to charge the DC power supply 12. The DC power supply 12 is connected in series with the boost chopper 19, which is used to boost the DC voltage output by the DC power supply 12 so that the DC voltage output by the DC power supply 12 meets the input requirements of the single-phase inverter 13. The host computer 11 determines the control signal according to the switching transistor parameters of the single-phase inverter 13 and sends the determined control signal to the first controller 14, so that the first controller controls the opening and closing of the first filter 15 and the second filter 16, so that the closed filter can perform high-quality harmonic filtering on the AC voltage output by the single-phase inverter. The first filter 15 and the second filter 16 are connected in series with the locomotive power supply circuit 110, and are used to input the filtered high-quality sinusoidal voltage waveform into various power-consuming devices of the locomotive to complete the high-quality emergency power supply of the locomotive.

[0062] like Figure 6B The diagram shows the structure of the locomotive's emergency power supply circuit. The battery charging module 20 charges the DC power supply 12. One end of the battery charging module 20 is connected to an external AC power source, and the other end is connected to the DC power supply 12. It converts AC power to DC power and charges the DC power supply 12. The DC power supply 12 inputs DC voltage to the boost chopper 19, which boosts the received DC voltage, converting it into a higher voltage. The host computer 11 sends a control signal to the first controller 14, which controls the opening and closing states of the single-phase inverter 13 with the first filter 15 and the second filter 16. The single-phase inverter 13 inverts the DC power input to the boost chopper 19 into AC power. The single-phase inverter connects to either the first filter 15 or the second filter 16 according to the control signal, thereby connecting to the locomotive's power supply circuit and supplying power to the locomotive's power-consuming equipment.

[0063] In summary, specific embodiments of this subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing can be advantageous.

[0064] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0065] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A locomotive emergency power supply system, characterized in that, include: Host computer, DC power supply, single-phase inverter, first controller, first filter and second filter, The DC power supply is connected in series with the single-phase inverter, and the first filter and the second filter are connected in parallel. The host computer is signal-connected to the first controller. When the first controller receives a first control signal from the host computer, it closes the first filter and opens the second filter; when it receives a second control signal from the host computer, the first controller closes the second filter and opens the first filter. The single-phase inverter is connected in series with the first filter or the second filter, and is connected to the corresponding locomotive power supply circuit through the first filter and the second filter.

2. The system according to claim 1, characterized in that, The first filter includes a first switch, a first control inductor, a second switch, and a first control capacitor. The second filter includes a third switch, a second control inductor, a fourth switch, and a second control capacitor. The first and second control inductors are connected in series, and the first and second control capacitors are connected in parallel. The first switch is connected in parallel with the first control inductor, the third switch is connected in parallel with the second control inductor, the second switch is connected in series with the first control capacitor, and the fourth switch is connected in series with the second control capacitor. When the first controller receives the first control signal, the first controller closes the first switch and the second switch and opens the third switch and the fourth switch. When the first controller receives the second control signal, the first controller closes the first switch, the second switch, the third switch, and the fourth switch.

3. The system according to claim 2, characterized in that, The system further includes a third filter, which comprises a fifth switch, a third control inductor, a sixth switch, and a third control capacitor. The third control inductor is connected in series with the second control inductor, and the third control capacitor is connected in parallel with the second control capacitor. The fifth switch is connected in parallel with the third control inductor, and the sixth switch is connected in series with the third control capacitor. When the first controller receives a fourth control signal sent by the host computer, it closes the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the sixth switch.

4. The system according to claim 1, characterized in that, The single-phase inverter is a full-bridge inverter.

5. The system according to claim 1, characterized in that, The system also includes a second controller. The single-phase inverter includes multiple switching transistors. The host computer is signal-connected to the second controller. The second controller is used to receive a third control signal sent by the host computer through the signal connection, which instructs to adjust the parameters of the multiple switching transistors.

6. The system according to claim 1, characterized in that, The first controller is connected to the single-phase inverter, which includes multiple switching transistors. When the first controller receives the first control signal, it adjusts the parameters of the multiple switching transistors to a first parameter; when it receives the second control signal, it adjusts the parameters of the multiple switching transistors to a second parameter.

7. The system according to claim 6, characterized in that, The system further includes a third filter. The first filter, the second filter, and the third filter are connected in parallel. When the first controller receives a fourth control signal sent by the host computer, it adjusts the switching transistor parameter to the third parameter, closes the third filter, and disconnects the first filter and the second filter.

8. The system according to claim 7, characterized in that, When the multiple switching transistors of the single-phase inverter are set to the first parameter, the single-phase inverter outputs an AC voltage of 110V and a frequency of 25Hz. When the multiple switching transistors of the single-phase inverter are set to the second parameter, the single-phase inverter outputs an AC voltage of 220V and a frequency of 50Hz. When the multiple switching transistors of the single-phase inverter are set to the third parameter, the single-phase inverter outputs an AC voltage of 255V and a frequency of 60Hz.

9. The system according to claim 1, characterized in that, The system also includes a boost chopper, one end of which is connected to the single-phase inverter and the other end of which is connected to the DC power supply.

10. The system according to claim 1, characterized in that, The system also includes a battery charging module, wherein the DC power source is a DC battery, and the charging module is connected to the DC battery.

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