Electric locomotive storage battery charging device and electric locomotive

Abstract

The utility model discloses an electric locomotive storage battery charging device and an electric locomotive, and relates to the field of charging. The device comprises a plurality of ACDC modules, a first current sensor, a second current sensor, a voltage sensor and a monitoring module, the ACDC modules are connected in parallel to a first node and a second node, outputs of the ACDC modules are respectively connected with a load and a storage battery, and the two current sensors are respectively added to an output main circuit and a storage battery branch circuit. The output of the current sensor is connected with a monitoring module, and each ACDC module is in communication connection with the monitoring module; each ACDC module comprises an active power factor correction unit and an LLC resonance unit. Thus, redundant backup is achieved, reliability is high, charging efficiency is high, the charging current and the charging voltage of the storage battery can be accurately controlled, and current and voltage data at the fault moment can be recorded.

Description

Technical Field

[0001] This utility model relates to the field of charging, and in particular to a battery charging device for electric locomotives and an electric locomotive. Background Technology

[0002] With the development of electric locomotives, the requirements for the charging of batteries used in electric locomotives are becoming increasingly stringent. Currently, the battery charging devices of electric locomotives typically use semiconductor device hard switching units and lack power factor correction units, resulting in low charging efficiency and large size and weight. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a charging device for electric locomotive batteries, which can improve the charging efficiency of electric locomotive batteries and reduce the size and weight of the charging device.

[0004] This utility model provides the following technical solution:

[0005] This utility model proposes a charging device for electric locomotive batteries, the device including multiple ACDC modules, a first current sensor, a second current sensor, a voltage sensor and a monitoring module;

[0006] Each of the ACDC modules is communicatively connected to the monitoring module. Each of the ACDC modules is connected in parallel to the first node and the second node. The first node is electrically connected to the power supply, and the second node is electrically connected to the load and the battery, respectively.

[0007] The second node is electrically connected to the monitoring module via the first current sensor and the voltage sensor, respectively, and the battery is electrically connected to the monitoring module via the second current sensor;

[0008] Each of the aforementioned ACDC modules includes a PFC unit and an LLC resonant unit. For each ACDC module, the input terminal of the PFC unit is electrically connected to the power supply terminal, the output terminal of the PFC unit is electrically connected to the input terminal of the LLC resonant unit, and the output terminal of the LLC resonant unit is electrically connected to the load, the battery, and the monitoring module, respectively.

[0009] The monitoring module is used to control the output voltage and output current of each ACDC module to achieve current sharing among the ACDC modules, control the charging current and charging voltage of the battery, and record the fault data of each ACDC module.

[0010] The PFC unit is used to rectify and boost the three-phase AC power output from the power supply terminal to obtain stable DC power, and to correct the input current waveform to improve the power factor.

[0011] The LLC resonant unit is used to convert the DC power into isolated low-voltage DC power and transmit the isolated low-voltage DC power to the battery and the load.

[0012] In one embodiment, the PFC unit includes a three-phase rectifier subunit, a precharge subunit, and a boost subunit;

[0013] The input terminal of the three-phase rectifier subunit is electrically connected to the power supply terminal, the output terminal of the three-phase rectifier subunit is electrically connected to the input terminal of the pre-charge subunit, the output terminal of the pre-charge subunit is electrically connected to the input terminal of the boost subunit, and the output terminal of the boost subunit is electrically connected to the input terminal of the LLC resonant unit.

[0014] In one embodiment, each of the ACDC modules further includes a main control unit, a first voltage sampling unit, a second voltage sampling unit, and a current sampling unit;

[0015] The first output terminal of the LLC resonant unit is electrically connected to the input terminal of the main control unit through the first voltage sampling unit, the second output terminal of the LLC resonant unit is electrically connected to the input terminal of the main control unit through the current sampling unit, and the third output terminal of the LLC resonant unit is electrically connected to the input terminal of the main control unit.

[0016] The output terminal of the boost subunit is electrically connected to the input terminal of the main control unit through the second voltage sampling unit, and the output terminal of the main control unit is electrically connected to the input terminal of the LLC resonant unit.

[0017] In one embodiment, the main control unit includes a microcontroller.

[0018] In one embodiment, each of the ACDC modules further includes a third voltage sampling unit, and the PFC unit further includes a PFC control chip;

[0019] The output terminal of the three-phase rectifier subunit is electrically connected to the input terminal of the third voltage sampling unit. The output terminals of the second voltage sampling unit and the third voltage sampling unit are both electrically connected to the input terminal of the PFC control chip. The output terminal of the PFC control chip is electrically connected to the boost subunit.

[0020] In one embodiment, the LLC resonant unit includes a switching subunit and a resonant converter subunit;

[0021] The input terminal of the switching subunit is electrically connected to the output terminal of the boost subunit and the main control unit, respectively. The output terminal of the switching subunit is electrically connected to the input terminal of the resonant converter subunit, and the output terminal of the resonant converter subunit is electrically connected to the load, the battery and the monitoring module, respectively.

[0022] In one embodiment, the LLC resonant unit is a three-phase half-bridge LLC circuit.

[0023] In one embodiment, the LLC resonant unit further includes an output filter subunit;

[0024] The output terminal of the resonant converter subunit is electrically connected to the load, the battery, and the monitoring module through the output filter subunit.

[0025] In one embodiment, the output filter subunit includes a common-mode inductor, a first Y capacitor, a second Y capacitor, and a varistor.

[0026] The input terminal of the common-mode inductor is electrically connected to the output terminal of the resonant converter subunit. The output terminal of the common-mode inductor is electrically connected to the first terminal of the first Y capacitor and the first terminal of the second Y capacitor. The second terminal of the first Y capacitor is electrically connected to the second terminal of the second Y capacitor. The first terminal of the varistor is electrically connected to the first terminal of the first Y capacitor, the load, the battery, and the monitoring module. The second terminal of the varistor is electrically connected to the first terminal of the second Y capacitor, and the second terminal of the varistor is grounded.

[0027] Secondly, this utility model proposes an electric locomotive, including the electric locomotive battery charging device described in the first aspect.

[0028] This utility model discloses an electric locomotive charging device and an electric locomotive, comprising multiple ACDC modules, a first current sensor, a second current sensor, a voltage sensor, and a monitoring module. Each ACDC module is connected in parallel to a first node and a second node. The input is three-phase AC power, and the output is DC 110V. The output is divided into two paths: one connected to the load, and the other connected to the battery. Two current sensors are respectively applied to the main output line and the battery branch line. The current sensor outputs are connected to the monitoring module, and each ACDC module is communicatively connected to the monitoring module. Each ACDC module includes an active power factor correction (PFC) unit and an LLC resonant unit. The monitoring module controls the output voltage and current of each ACDC module to achieve current sharing among them. Thus, the power factor of the electric locomotive charging device can be improved through the PFC unit and LLC resonant unit, with redundancy backup. It can accurately control the charging current and voltage of the battery, record current and voltage data at fault times, improve charging efficiency, shorten charging time, and reduce energy waste. Attached Figure Description

[0029] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and therefore should not be regarded as a limitation on the protection scope of this utility model. In the various drawings, similar components are numbered similarly.

[0030] Figure 1 A schematic diagram of the structure of the electric locomotive battery charging device proposed in this utility model is shown.

[0031] Figure 2 A schematic diagram of the structure of the PFC unit proposed in this utility model is shown;

[0032] Figure 3 A schematic diagram of the structure of the ACDC module proposed in this utility model is shown;

[0033] Figure 4 A schematic diagram of the LLC resonant unit proposed in this invention is shown.

[0034] Figure 5 A schematic diagram of the structure of the first voltage sampling module proposed in this utility model is shown;

[0035] Figure 6 A schematic diagram of the structure of the second voltage sampling module and the third voltage sampling module proposed in this utility model is shown;

[0036] Figure 7 A schematic diagram of the structure of the PFC control chip proposed in this utility model is shown.

[0037] Explanation of reference numerals in the attached diagram:

[0038] 100-ACDC module; 200-Monitoring module; 300-First current sensor; 400-Second current sensor; 500-Voltage sensor; 101-PFC unit; 102-LLC resonant unit; 103-Main control unit; 104-First voltage sampling unit; 105-Second voltage sampling unit; 106-Current sampling unit; 107-Third voltage sampling unit; 1011-Three-phase rectifier subunit; 1012-Precharge subunit; 1013-Boost subunit; 1021-Switching subunit; 1022-Resonant converter subunit; 1023-Transformer subunit; 1024-Rectifier subunit; 1025-Output filter subunit; 1026-Discharge unit. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0040] The components of the present invention, as described and illustrated in the accompanying drawings, can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] In the following, the terms “comprising,” “having,” and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as excluding, firstly, the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations thereof.

[0042] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0043] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this invention pertain. The terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this invention.

[0044] Example 1

[0045] This disclosure provides a battery charging device for electric locomotives, which improves the charging efficiency of electric locomotive batteries.

[0046] Please see Figure 1 A battery charging device for electric locomotives includes multiple AC-DC modules 100, a monitoring module 200, a first current sensor 300, a second current sensor 400, and a voltage sensor 500.

[0047] Each of the ACDC modules 100 is communicatively connected to the monitoring module 200. Each of the ACDC modules 100 is connected in parallel to the first node A and the second node B. The first node A is electrically connected to the power supply, and the second node B is electrically connected to the load and the battery, respectively.

[0048] The second node B is electrically connected to the monitoring module 200 through the first current sensor 300 and the voltage sensor 500, respectively, and the battery is electrically connected to the monitoring module 200 through the second current sensor 400.

[0049] Each of the ACDC modules 100 includes a PFC unit 101 and an LLC resonant unit 102. For each ACDC module 100, the input terminal of the PFC unit 101 is electrically connected to the power supply terminal, the output terminal of the PFC unit 101 is electrically connected to the input terminal of the LLC resonant unit 102, and the output terminal of the LLC resonant unit 102 is electrically connected to the load, the battery, and the monitoring module 200, respectively.

[0050] The monitoring module 200 is used to control the output voltage and output current of each ACDC module 100 to achieve current sharing among each ACDC module 100, control the charging current and charging voltage of the battery, and record the fault data of each ACDC module 100.

[0051] The PFC unit 101 is used to rectify and boost the three-phase AC power output from the power supply terminal to obtain stable DC power, and to correct the input current waveform to improve the power factor.

[0052] The LLC resonant unit 102 is used to convert the DC power into isolated low-voltage DC power and transmit the isolated low-voltage DC power to the battery and the load.

[0053] In this embodiment, the electric locomotive charging device includes multiple AC-DC converter modules 100, a monitoring module 200, a first current sensor 300, a second current sensor 400, and a voltage sensor 500. Through the parallel connection of the AC-DC modules 100, the charging device can still operate even if one AC-DC module fails. The damaged component can then be replaced promptly, ensuring the charging device's operation and thus achieving reliability. The monitoring module 200 has functions such as hot standby redundancy, automatic current sharing, battery charging management, and fault storage. It transmits the current from each AC-DC module 100 to the monitoring module 200, which then calculates the average current and sends it to each AC-DC module 100. Each AC-DC module 100 controls its output average current, ensuring consistent output current across all modules, maximizing energy utilization, and improving battery charging efficiency.

[0054] Specifically, the total current output of the second node B is sampled by the first current sensor 300 and sent to the monitoring module 200. The monitoring module 200 calculates the average current and sends it to each ACDC module 100, so that the ACDC module 100 outputs the same current.

[0055] The second current sensor 400 samples the battery charging current and sends it to the monitoring module 200. The voltage sensor 500 samples the battery charging voltage and sends it to the monitoring module 200. The monitoring module 200 calculates the charging current and charging voltage deviation based on the battery charging curve, and then sends a new charging voltage command to each ACDC module 100 through a PID control algorithm.

[0056] Each AC-DC module 100 includes two parts: an active power factor correction (PFC) unit 101 and an LLC resonant unit 102. The PFC unit 101 receives three-phase AC power from the power supply, rectifies it into DC power, and performs power factor correction on the DC power to obtain power factor-corrected DC power, which helps reduce the generation of ineffective power and reduce energy waste. Then, the output of the PFC unit 101 transmits the power factor-corrected DC power to the LLC resonant unit 102. The LLC resonant unit 102 isolates the power factor-corrected DC power from the high-voltage to the low-voltage, and outputs isolated low-voltage DC power to the locomotive's 110V load and battery for charging, thereby improving electrical isolation performance. This, in turn, improves the charging efficiency of the electric locomotive charging device by reducing power waste and improving electrical isolation. Generally, the power supply is 3AC 380V.

[0057] It should be noted that there are five ACDC modules in this embodiment, but there can be multiple modules in other embodiments, such as six or seven.

[0058] Please see Figure 2 In one specific embodiment, the PFC unit 101 includes a three-phase rectifier subunit 1011, a precharge subunit 1012, and a boost subunit 1013.

[0059] The input terminal of the three-phase rectifier subunit 1011 is electrically connected to the power supply terminal, the output terminal of the three-phase rectifier subunit 1011 is electrically connected to the input terminal of the pre-charge subunit 1012, the output terminal of the pre-charge subunit 1012 is electrically connected to the input terminal of the boost subunit 1013, and the output terminal of the boost subunit 1013 is electrically connected to the input terminal of the LLC resonant unit 102.

[0060] In this embodiment, the three-phase rectifier subunit 1011 includes fuses F1, F2, and F3, and a rectifier bridge D1. VIN_A, VIN_B, and VIN_C are the three-phase AC power output from the power supply terminal; fuses F1, F2, and F3 prevent fire caused by internal short circuits in the module; six diodes are combined to form the rectifier bridge D1, which converts the three-phase AC power output from fuses F1, F2, and F3 into DC power, and transmits the rectified DC power to the pre-charge subunit 1012.

[0061] The input terminals of fuses F1, F2 and F3 serve as the input terminals of the three-phase rectifier sub-unit 1011, and the output terminal of the rectifier bridge serves as the output terminal of the three-phase rectifier sub-unit 1011.

[0062] The pre-charge sub-unit 1012 includes a pre-charge relay J1 and a short-circuit relay J2; the input terminals of both the pre-charge relay J1 and the short-circuit relay J2 are electrically connected to the first output terminal of the rectifier bridge D2, and the output terminals of both the pre-charge relay J1 and the short-circuit relay J2 are electrically connected to the input terminal of the boost sub-unit.

[0063] The input terminals of the pre-charge relay J1 and the short-circuit relay J2 serve as the input terminals of the pre-charge sub-unit 1012, and the output terminals of the pre-charge relay J1 and the short-circuit relay J2 serve as the output terminals of the pre-charge sub-unit 1012.

[0064] The boost sub-unit 1013 includes a boost inductor L1, a diode D2, a MOSFET Q1, a first current sampling transformer T1, a second current sampling transformer T2, and bus capacitors C1, C2, C3, and C4. The input terminal of the boost inductor L1 is electrically connected to the output terminal of the precharge electronic unit 1012. The output terminal of the boost inductor L1 is electrically connected to the first terminal of the first current sampling transformer T1 and the first terminal of the second current sampling transformer T2. The second terminal of the first current sampling transformer T2 is electrically connected to the positive terminal of the diode D2. The negative terminal of the diode D2 is electrically connected to the first terminal of the bus capacitor C1, the first terminal of the bus capacitor C2, and the input terminal of the LLC resonant unit 102. The second terminal of the second current sampling transformer T2 is electrically connected to the second output terminal of the rectifier bridge D2 through the MOSFET Q1. The second terminal of the second current sampling transformer T2 is grounded through the MOSFET Q1, the first terminal of the bus capacitor C3, and the first terminal of the bus capacitor C4. The second terminal of the bus capacitor C1 is electrically connected to the second terminals of the bus capacitor C2, the second terminals of the bus capacitor C3, and the second terminals of the bus capacitor C4. The second terminal of the bus capacitor C2 is electrically connected to the second terminals of the bus capacitor C1, the second terminals of the bus capacitor C3, and the second terminals of the bus capacitor C4.

[0065] The second terminal of the second current sampling transformer is electrically connected to the drain of the MOSFET Q1, and the source of the MOSFET Q1 is electrically connected to the second output terminal of the rectifier bridge D2 and the first terminal of the bus capacitor C3.

[0066] When the voltage output from the precharge electronic unit 1012 passes through the boost inductor L1, the boost inductor L1 generates a magnetic field. This magnetic field stores energy. During the off-state of the MOSFET Q1, the magnetic field in the boost inductor L1 changes, generating an induced electromotive force (EMF). This induced EMF is superimposed on the input voltage, causing the output voltage to increase. Simultaneously, the impedance of the boost inductor L1 is related to the current; as the current increases, the inductor's impedance also increases, thus limiting the current and helping to maintain the stability of the output voltage. Furthermore, the boost inductor L1 has a certain suppression effect on high-frequency noise and fluctuations, reducing output voltage ripple and improving output voltage quality.

[0067] MOSFET Q1 acts as a switch in the boost subunit 1013. By adjusting the duty cycle, precise control of the output voltage can be achieved.

[0068] During the off-state of MOSFET Q1, the current in boost inductor L1 cannot change abruptly, resulting in a reverse electromotive force. Diode D2 conducts at this time, providing a discharge path for the current in boost inductor L1 and preventing damage to the unit from the reverse current. Furthermore, diode D2 also acts as a rectifier, ensuring the correct polarity of the output voltage.

[0069] During the conduction of MOSFET Q1, instantaneous energy is provided to bus capacitors C1, C2, C3, and C4 to ensure the unit can operate normally during voltage rise. Simultaneously, the output voltage is filtered to further reduce output voltage ripple and improve output voltage stability. Furthermore, the parallel connection of bus capacitors C1, C2, C3, and C4 helps balance the voltage, ensuring uniform voltage distribution across all capacitors.

[0070] It should be noted that PFC unit 101 also includes capacitor C5, diode D3, thermistor NTC1, discharge resistors (R1, R2, R3, R4), and antenna PE1. Capacitor C5 is used to filter out the high-frequency ripple current generated by the switching of MOSFET Q1. Diode D3 is a bypass diode of PFC unit 101, which charges the bus capacitor at power-on and prevents surge current from flowing through boost inductor L1 and diode D, thus preventing inductor saturation and damage to MOSFET Q1. Discharge resistors (R1, R2, R3, R4) are used for discharge. Thermistor NTC1 mainly serves to suppress surge current and provide overheat protection. Antenna PE1 is used for electrical safety.

[0071] Please see Figure 3 In one specific embodiment, each of the ACDC modules 100 further includes a main control unit 103, a first voltage sampling unit 104, a second voltage sampling unit 105, and a current sampling unit 106.

[0072] The first output terminal of the LLC resonant unit 102 is electrically connected to the input terminal of the main control unit 103 through the first voltage sampling unit 104. The second output terminal of the LLC resonant unit 102 is electrically connected to the input terminal of the main control unit 103 through the current sampling unit 106. The third output terminal of the LLC resonant unit 102 is electrically connected to the input terminal of the main control unit 103.

[0073] The output terminal of the boost subunit 1013 is electrically connected to the input terminal of the main control unit 103 through the second voltage sampling unit 105, and the output terminal of the main control unit 103 is electrically connected to the input terminal of the LLC resonant unit 102.

[0074] The main control unit 103 includes a microcontroller.

[0075] In this embodiment, please refer to Figure 4 and Figure 5The voltage signal Vout1 output from the first output terminal of the LLC resonant unit 102 after rectification is sampled by the first voltage sampling unit 104, and the sampled signal Vout1 is input to the main control unit 103; the current signal output from the second output terminal of the LLC resonant unit 102 after rectification is sampled by the current sampling unit 106, and the sampled signal IOUT is input to the main control unit 103; the voltage signal VOUT output from the LLC resonant unit 102 after resonance processing is also input to the main control unit 103.

[0076] In addition, please see Figure 6 The power factor correction DC voltage signal VBUS+ output from the boost subunit 1013 is sampled by the second voltage sampling unit 105, and the sampled signal V_busFB is also input to the main control unit 103. The first output terminal of the boost subunit 1013 is the first terminal of the bus capacitor C2.

[0077] The main control unit 103 generates a control signal based on the received voltage and current signals and inputs the control signal to the LLC resonant unit 102 to control the LLC resonant unit 102 in processing the voltage and current signals.

[0078] It should be noted that microcontrollers (MCUs) play an important role as the main control unit in data processing and control, system integration and simplification, low power consumption and high efficiency, flexibility and scalability, reliability and stability, and wide range of applications.

[0079] Please see Figure 7 In one specific embodiment, each of the ACDC modules 100 further includes a third voltage sampling unit 107, and the PFC unit 101 further includes a PFC control chip U1.

[0080] The output terminal of the three-phase rectifier subunit 1011 is electrically connected to the input terminal of the third voltage sampling unit 107. The output terminals of the second voltage sampling unit 105 and the third voltage sampling unit 107 are both electrically connected to the input terminal of the PFC control chip U1. The output terminal of the PFC control chip U1 is electrically connected to the boost subunit 1013.

[0081] In this embodiment, each ACDC module 100 further includes a third voltage sampling unit 107, and the PFC control chip U1 includes an IAC pin, a VRMS pin, a VSENSE pin, a PKLMT pin, a MOUT pin, and a GTDRV pin. The IAC pin, VRMS pin, VSENSE pin, PKLMT pin, and MOUT pin are the input terminals of the PFC control chip U1, and the GTDRV pin is the output terminal of the PFC control chip U1.

[0082] The voltage signals +DC and -DC output from the three-phase rectifier subunit 1011 are sampled by the third voltage sampling unit 107 to obtain sampled voltage signals VR, Vin11, and VRMS. Voltage signals VR and VRMS are input to the PFC control chip U1 via the IAC pin and VRMS pin, respectively. Voltage signal Vin11 is transmitted to the main control unit 103 to participate in the generation of control signals.

[0083] The second voltage sampling unit 105 also generates a voltage signal V_busFB1 based on the voltage signal V BUS+. The voltage signal V_busFB1 is input to the PFC control chip U1 through the VSENSE pin.

[0084] Furthermore, the first current sampling transformer T1 and the second current sampling transformer T2 sample the boosted DC current and transmit the sampled current signals IS and I_D to the PFC control chip U1 via the PKLMT pin and MOUT pin, respectively. The PFC control chip U1 then performs power factor correction based on the current signals IS and I_D, as well as the voltage signals VR, VRMS, and V_busFB1, to obtain the voltage signal PFC_PWMA2_1. Here, the voltage signal VR is the transient sampling signal of the rectified DC voltage, and the signal VRMS is the RMS sampling signal.

[0085] The PFC control chip U1 is electrically connected to the gate of the MOSFET Q1 in the boost sub-unit 1013 through the GTDRV pin. The PFC PWMA2 1 signal is transmitted through the GTDRV pin to control the conduction and turn-off of the MOSFET Q1, thereby controlling the change of current in the boost inductor L1, and thus controlling the increase of the output voltage.

[0086] In one specific embodiment, the LLC resonant unit 102 includes a switching subunit 1021 and a resonant transformation subunit 1022.

[0087] The input terminal of the switching subunit 1021 is electrically connected to the output terminal of the boost subunit 1013 and the main control unit 103, respectively. The output terminal of the switching subunit 1021 is electrically connected to the input terminal of the resonant converter subunit 1022. The output terminal of the resonant converter subunit 1022 is electrically connected to the load, the battery and the monitoring module 200, respectively.

[0088] In this embodiment, the LLC resonant unit 102 can be a three-phase half-bridge LLC circuit.

[0089] The switching subunit 1021 includes three switching groups, each of which includes two MOSFETs. The drain of each MOSFET receives the voltage signal VBUS+ output by the PFC control unit 101, and the source of each MOSFET receives the control signals (PWMA1_1, PWMA2_1, PWMB1_1, PWMB2_1, PWMC1_1, PWMC2_1) output by the main control unit 103. These signals are used to control the conduction of each MOSFET in the switching subunit 1021, thereby controlling the flow of electrical energy and achieving effective regulation of the output voltage and current. When the current is too high, the MOSFETs in the switching subunit 1021 may enter the overcurrent protection state and automatically cut off the circuit to prevent damage to the circuit components.

[0090] The resonant transformer subunit 1022 includes three resonant cavities. In addition, the LLC resonant unit 102 also includes a transformer subunit 1023 and a rectifier subunit 1024.

[0091] Each resonant cavity is electrically connected to an independent half-bridge, and each resonant cavity consists of an inductor and a capacitor connected in series. These resonant converter subunits 1022 and 1023 work together to amplify or reduce the voltage and current of the high-frequency alternating current through the resonance effect, thereby achieving voltage transformation. The design of the resonant converter subunit 1022 optimizes circuit transmission efficiency, reduces energy loss, and lowers electromagnetic interference.

[0092] The transformer subunit 1023 includes three transformers, each electrically connected to a resonant cavity. It utilizes the principle of electromagnetic induction to transform the high-frequency AC output from the resonant transformer subunit 1022 to meet the voltage requirements of different loads. Simultaneously, the transformer subunit 1023 also achieves electrical isolation between the input and output, improving the system's safety and stability.

[0093] The rectifier unit 1024 includes 12 diodes used to convert the high-frequency AC power output from the transformer unit 1023 into DC power. The rectifier unit 1024 is a key component in ensuring that the output voltage is DC.

[0094] In one specific embodiment, the LLC resonant unit further includes an output filter subunit 1025;

[0095] The output terminal of the resonant converter subunit 1022 is electrically connected to the load, the battery and the monitoring module 200 respectively through the output filter subunit 1025.

[0096] In this embodiment, the output filter subunit 1025 is used to filter out high-frequency noise and ripple in the DC output of the rectifier subunit 1024, making the output voltage purer and more stable. The output filter subunit 1025 is typically composed of inductors, capacitors, and other components, forming a low-pass filter to filter out high-frequency components while retaining the DC component. The performance of the output filter subunit 1025 directly affects the stability of the output voltage and its adaptability to the load. Specifically, the output filter subunit 1025 includes multiple capacitors and a common-mode inductor, as well as multiple antenna grounds and diodes for parallel operation. The voltage signal VOUT output by the output filter subunit 1025 can be used to power the battery.

[0097] In one specific embodiment, the output filter subunit 1025 includes a common-mode inductor L2, a first Y capacitor C6, a second Y capacitor C7, and a varistor R5.

[0098] The input terminal of the common-mode inductor L2 is electrically connected to the output terminal of the resonant converter subunit 1022. The output terminal of the common-mode inductor L2 is electrically connected to the first terminal of the first Y capacitor C6 and the first terminal of the second Y capacitor C7. The second terminal of the first Y capacitor C6 is electrically connected to the second terminal of the second Y capacitor C7. The first terminal of the varistor R5 is electrically connected to the first terminal of the first Y capacitor C6, the load, the battery, and the monitoring module 200. The second terminal of the varistor R5 is electrically connected to the first terminal of the second Y capacitor C7, and the second terminal of the varistor R5 is grounded.

[0099] In this embodiment, the output terminal of the resonant transformer subunit 1022 is electrically connected to the input terminal of the common-mode inductor L2 through the transformer subunit 1023 and the rectifier subunit 1024.

[0100] The first Y capacitor C6 and the second Y capacitor C7 work together with the common-mode inductor L2 to suppress common-mode interference and improve the anti-interference capability of the LLC resonant unit 102. When the power line and long-distance signal line encounter lightning strikes or surge pulses, the varistor R5 can effectively absorb these energies and protect the electronic equipment in the circuit from damage.

[0101] It should be noted that the LLC resonant unit 102 also includes an electron discharge unit 1026. The first end of the electron discharge unit 1026 is electrically connected to the first end of the first Y capacitor C7, and the second end of the electron discharge unit 1026 is electrically connected to the first end of the second Y capacitor C8.

[0102] The discharge unit 1026 includes multiple discharge resistors, and discharge is performed through the discharge unit 1026 for safety purposes.

[0103] The electric locomotive charging device proposed in this embodiment includes multiple ACDC modules, a first current sensor, a second current sensor, a voltage sensor, and a monitoring module. Each ACDC module is connected in parallel to a first node and a second node. The input is three-phase AC power, and the output is DC 110V. The output is divided into two paths: one connected to the load, and the other connected to the battery. Two current sensors are respectively applied to the main output line and the battery branch line. The current sensor outputs are connected to the monitoring module, and each ACDC module is communicatively connected to the monitoring module. Each ACDC module includes an active power factor correction (PFC) unit and an LLC resonant unit. The monitoring module controls the output voltage and current of each ACDC module to achieve current sharing among them. Thus, the PFC unit and LLC resonant unit can improve the power factor of the electric locomotive charging device and provide redundancy backup. It can accurately control the charging current and voltage of the battery, record current and voltage data at fault times, improve charging efficiency, shorten charging time, and reduce energy waste.

[0104] Example 2

[0105] This embodiment proposes an electric locomotive, including the electric locomotive charging device described in Embodiment 1. To avoid repetition, it will not be described again here.

[0106] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0107] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0108] The embodiments described above are merely examples of several implementations of the utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the protection scope of the utility model.

Claims

1. A charging device for an electric locomotive battery, characterized in that, The device includes multiple ACDC modules, a first current sensor, a second current sensor, a voltage sensor, and a monitoring module; Each of the ACDC modules is communicatively connected to the monitoring module. Each of the ACDC modules is connected in parallel to the first node and the second node. The first node is electrically connected to the power supply, and the second node is electrically connected to the load and the battery, respectively. The second node is electrically connected to the monitoring module via the first current sensor and the voltage sensor, respectively, and the battery is electrically connected to the monitoring module via the second current sensor; Each of the aforementioned ACDC modules includes a PFC unit and an LLC resonant unit. For each ACDC module, the input terminal of the PFC unit is electrically connected to the power supply terminal, the output terminal of the PFC unit is electrically connected to the input terminal of the LLC resonant unit, and the output terminal of the LLC resonant unit is electrically connected to the load, the battery, and the monitoring module, respectively. The monitoring module is used to control the output voltage and output current of each ACDC module to achieve current sharing among the ACDC modules, control the charging current and charging voltage of the battery, and record the fault data of each ACDC module. The PFC unit is used to rectify and boost the three-phase AC power output from the power supply terminal to obtain stable DC power, and to correct the input current waveform to improve the power factor. The LLC resonant unit is used to convert the DC power into isolated low-voltage DC power and transmit the isolated low-voltage DC power to the battery and the load.

2. The electric locomotive battery charging device according to claim 1, characterized in that, The PFC unit includes a three-phase rectifier subunit, a precharge subunit, and a boost subunit; The input terminal of the three-phase rectifier subunit is electrically connected to the power supply terminal, the output terminal of the three-phase rectifier subunit is electrically connected to the input terminal of the pre-charge subunit, the output terminal of the pre-charge subunit is electrically connected to the input terminal of the boost subunit, and the output terminal of the boost subunit is electrically connected to the input terminal of the LLC resonant unit.

3. The electric locomotive battery charging device according to claim 2, characterized in that, Each of the aforementioned ACDC modules further includes a main control unit, a first voltage sampling unit, a second voltage sampling unit, and a current sampling unit; The first output terminal of the LLC resonant unit is electrically connected to the input terminal of the main control unit through the first voltage sampling unit, the second output terminal of the LLC resonant unit is electrically connected to the input terminal of the main control unit through the current sampling unit, and the third output terminal of the LLC resonant unit is electrically connected to the input terminal of the main control unit. The output terminal of the boost subunit is electrically connected to the input terminal of the main control unit through the second voltage sampling unit, and the output terminal of the main control unit is electrically connected to the input terminal of the LLC resonant unit.

4. The electric locomotive battery charging device according to claim 3, characterized in that, The main control unit includes a microcontroller.

5. The electric locomotive battery charging device according to claim 3, characterized in that, Each of the aforementioned ACDC modules further includes a third voltage sampling unit, and the PFC unit further includes a PFC control chip; The output terminal of the three-phase rectifier subunit is electrically connected to the input terminal of the third voltage sampling unit. The output terminals of the second voltage sampling unit and the third voltage sampling unit are both electrically connected to the input terminal of the PFC control chip. The output terminal of the PFC control chip is electrically connected to the boost subunit.

6. The electric locomotive battery charging device according to claim 3, characterized in that, The LLC resonant unit includes a switching subunit and a resonant transformation subunit; The input terminal of the switching subunit is electrically connected to the output terminal of the boost subunit and the main control unit, respectively. The output terminal of the switching subunit is electrically connected to the input terminal of the resonant converter subunit, and the output terminal of the resonant converter subunit is electrically connected to the load, the battery and the monitoring module, respectively.

7. The electric locomotive battery charging device according to claim 1, characterized in that, The LLC resonant unit is a three-phase half-bridge LLC circuit.

8. The electric locomotive battery charging device according to claim 6, characterized in that, The LLC resonant unit also includes an output filter subunit; The output terminal of the resonant converter subunit is electrically connected to the load, the battery, and the monitoring module through the output filter subunit.

9. The electric locomotive battery charging device according to claim 8, characterized in that, The output filter subunit includes a common-mode inductor, a first Y capacitor, a second Y capacitor, and a varistor; The input terminal of the common-mode inductor is electrically connected to the output terminal of the resonant converter subunit. The output terminal of the common-mode inductor is electrically connected to the first terminal of the first Y capacitor and the first terminal of the second Y capacitor. The second terminal of the first Y capacitor is electrically connected to the second terminal of the second Y capacitor. The first terminal of the varistor is electrically connected to the first terminal of the first Y capacitor, the load, the battery, and the monitoring module. The second terminal of the varistor is electrically connected to the first terminal of the second Y capacitor, and the second terminal of the varistor is grounded.

10. An electric locomotive, characterized in that, Includes the electric locomotive battery charging device as described in any one of claims 1 to 9.

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