Emergency power supply suitable for electric mine truck

Abstract

The utility model relates to an emergency power supply suitable for an electric mine truck, which is characterized by comprising a high-voltage battery input side and a low-voltage battery output side, the input side of the high-voltage battery comprises a capacitor C1, a discharge resistor R1, a power module VQ1, a power module VQ2 and a coupling inductor L1; the output side of the low-voltage battery comprises a capacitor C2, a discharge resistor R2, a current detection circuit, a voltage detection circuit and a control unit; wherein a capacitor C1 and a discharge resistor R1 at the input side of the high-voltage battery are connected in parallel through a composite busbar and are simultaneously connected to C1 poles and E2 poles of the power modules VQ1 and VQ2, E1 poles and C2 poles of the power modules VQ1 and VQ2 are respectively connected in series and are connected to the coupling inductor L1, the other end of the coupling inductor L1 is connected in series with a positive electrode of the low-voltage side, and the E2 poles of the power modules VQ1 and VQ2 are connected in series with a negative electrode of the low-voltage side. A capacitor C2 and a discharge resistor R2 on the output side of the low-voltage battery are connected in parallel between the positive and negative electrodes of the low-voltage side.

Description

Technical Field

[0001] This utility model relates to the field of electrification of mining machinery, and in particular to an emergency power supply suitable for electric mining trucks. Background Technology

[0002] The electrification of mining machinery is an inevitable trend in the transformation and upgrading of the mining industry, and also a goal for achieving green, intelligent, and efficient mining. Compared with traditional fuel-powered equipment, electrified mining machinery has advantages such as being environmentally friendly, intelligent, efficient, and sustainable, which can greatly enhance the competitiveness of mining machinery. The electrification of mining trucks can effectively reduce operating costs, improve transportation efficiency, and reduce fuel consumption.

[0003] Mining trucks require a continuous power supply during operation. A sudden power outage could lead to equipment damage, personnel injuries, and other accidents. Emergency power supplies ensure the mining trucks can continue operating in the event of a power outage, providing power to onboard communication equipment, maintaining communication between personnel and the ground, and providing necessary lighting and ventilation to prevent accidents. Emergency power supplies can provide additional power to mining trucks, effectively preventing downtime due to power outages, improving production efficiency, and extending working hours.

[0004] A bidirectional DC-DC (Direct Current to Direct Current) converter, as the name suggests, is a DC power converter capable of bidirectional energy conversion. Compared to traditional unidirectional DC-DC converters, bidirectional DC-DC converters can simultaneously achieve forward and reverse energy flow and perform energy conversion between different voltage levels.

[0005] Current technology typically involves connecting two DC-DC converters, each connected to an inductor, and then in parallel to the circuit, such as... Figure 1 As shown, this method uses the same structure as this patent, but employs two independent inductors. Discrete inductors increase circuit size Larger circuits are required for multi-phase interleaved parallel DC-DC converters, as the overall circuit size will be larger.

[0006] Therefore, there is an urgent need for a new type of emergency power supply that can optimize the above-mentioned technical problems. Utility Model Content

[0007] Exemplary embodiments of this application provide an emergency power supply suitable for electric mining trucks, so as to at least achieve the technical effect of providing the required power to electric mining trucks in emergency situations and being able to transfer power from the power grid to the backup battery.

[0008] Exemplary embodiments of this application provide an emergency power supply suitable for electric mining trucks, including:

[0009] High-voltage battery input side and low-voltage battery output side;

[0010] The high-voltage battery input side includes capacitor C1 and discharge resistor R1, power module VQ1, power module VQ2, and coupling inductor L1; the low-voltage battery output side includes capacitor C2 and discharge resistor R2, current detection circuit, voltage detection circuit, and control unit.

[0011] On the input side of the high-voltage battery, capacitor C1 and discharge resistor R1 are connected in parallel via a composite busbar. At the same time, C1 and E2 terminals of power modules VQ1 and VQ2 are connected. E1 and C2 terminals of power modules VQ1 and VQ2 are connected in series and connected to coupling inductor L1. The other end of coupling inductor L1 is connected in series to the positive terminal of the low-voltage side. E2 terminals of power modules VQ1 and VQ2 are connected in series to the negative terminal of the low-voltage side. On the output side of the low-voltage battery, capacitor C2 and discharge resistor R2 are connected in parallel between the positive and negative terminals of the low-voltage side.

[0012] Preferably, the detection circuit is configured to detect the bus voltage on the high-voltage side and the low-voltage side, the temperature of the power module, and the bus current.

[0013] Preferably, the voltage detection circuit and the current detection circuit are configured to detect the voltage and current signals of the emergency power supply, respectively.

[0014] Preferably, the control unit is connected to power modules VQ1 and VQ2 respectively, and is configured to acquire the voltage signal detected by the voltage detection circuit and control the opening and closing of the power modules.

[0015] Preferably, the low-voltage side of the emergency power supply is connected to the backup battery, and the high-voltage side is connected to the vehicle power supply. The emergency power supply is configured to use the power in the vehicle's electrical grid to charge and store energy for the backup battery. When the main power battery is abnormal or its charge is too low, the backup battery supplies power to the vehicle's electrical grid. Beneficial effects

[0016] This application discloses an emergency power supply applicable to electric mining trucks, with the aim of providing the necessary power to the electric mining trucks in emergency situations and transmitting power from the power grid to the backup battery. It can simultaneously meet the emergency power requirements of electric mining trucks. The use of coupling capacitors significantly reduces the overall circuit size, occupies less space, and facilitates easy installation, wiring, and fabrication at a low cost.

[0017] This power supply employs a bidirectional DC-DC design, allowing the energy generated by the traction motor braking to be fed back to the grid or energy storage batteries, reducing energy consumption. The use of interleaved parallel coupled inductors effectively reduces inductor current ripple, suppresses current circulation, significantly reduces the size of the emergency power supply, and increases power density. The power supply requires minimal installation space, offering greater installation flexibility. The interaction of the coupled inductors also improves the stability and reliability of the power supply, extending its lifespan. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the emergency power supply system structure of this utility model;

[0020] Figure 3 This is a schematic diagram showing the flow of the backup battery energy storage current in this utility model.

[0021] Figure 4 A schematic diagram showing the flow of emergency power supply current according to this utility model;

[0022] Figure 5 This is a schematic diagram of the energy flow direction of the vehicle system of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] In one embodiment, such as Figures 2 to 5 As shown, this utility model proposes an emergency power supply suitable for electric mining trucks, comprising:

[0025] High-voltage battery input side and low-voltage battery output side;

[0026] The high-voltage battery input side includes capacitor C1 and discharge resistor R1, power module VQ1, power module VQ2, and coupling inductor L1; the low-voltage battery output side includes capacitor C2 and discharge resistor R2, current detection circuit, voltage detection circuit, and control unit.

[0027] On the input side of the high-voltage battery, capacitor C1 and discharge resistor R1 are connected in parallel via a composite busbar. At the same time, C1 and E2 terminals of power modules VQ1 and VQ2 are connected. E1 and C2 terminals of power modules VQ1 and VQ2 are connected in series and connected to coupling inductor L1. The other end of coupling inductor L1 is connected in series to the positive terminal of the low-voltage side. E2 terminals of power modules VQ1 and VQ2 are connected in series to the negative terminal of the low-voltage side. On the output side of the low-voltage battery, capacitor C2 and discharge resistor R2 are connected in parallel between the positive and negative terminals of the low-voltage side.

[0028] The detection circuit is configured to detect the bus voltage on the high-voltage side and the low-voltage side, the temperature of the power module, and the bus current.

[0029] The voltage detection circuit and the current detection circuit are respectively configured to detect the voltage and current signals of the emergency power supply.

[0030] The control unit is connected to power modules VQ1 and VQ2 respectively, and is configured to acquire the voltage signal detected by the voltage detection circuit and control the opening and closing of the power modules.

[0031] The emergency power supply is connected to the backup battery on the low-voltage side and to the vehicle power supply on the high-voltage side. The emergency power supply is configured to use the power in the vehicle's electrical grid to charge and store energy for the backup battery. When the main power battery is abnormal or its charge is too low, the backup battery supplies power to the vehicle's electrical grid.

[0032] Among them, coupled inductance: When the magnetic flux generated by each of two or more coils is linked to that of another coil, these coils are said to have magnetic coupling, or mutual inductance. If we assume that these coils are stationary and ignore the resistance in the coils and the distributed capacitance between the turns, the coils with magnetic coupling can be represented as idealized coupled inductor elements, or simply coupled inductors.

[0033] Bidirectional DC-DC converter: A bidirectional DC-DC converter that changes the direction of the current according to actual needs while keeping the polarity of the input and output voltage constant, thus achieving dual-quadrant operation.

[0034] Figure 1 In current technologies, two-phase interleaved parallel DC-DC circuits, as can be seen from the interleaved parallel circuit, all power devices are composed of two phases connected in parallel, and theoretically the total power is twice that of a single-phase circuit. Due to the increase in magnetic components, if discrete inductors are used, the circuit size will increase, and for multi-phase interleaved parallel DC-DC circuits, the overall circuit size will be even larger.

[0035] And through Figures 2-5 The power supply solution of this application employs interleaved parallel connection of coupled inductors in a bidirectional DC-DC emergency power supply for electric mining trucks. It provides the necessary power to the electric mining trucks in emergencies and can transfer power from the grid to the backup battery. This provides an emergency power supply solution that simultaneously meets the needs of electric mining trucks. The use of coupled capacitors significantly reduces the overall circuit size, occupies less space, and facilitates easy installation, wiring, and fabrication at a low cost. The bidirectional DC-DC design allows the energy generated by the traction motor braking to be fed back to the grid or energy storage battery, reducing energy consumption. The interleaved parallel connection of coupled inductors effectively reduces inductor current ripple, suppresses current circulation, greatly reduces the size of the emergency power supply, and increases power density. The power supply requires little installation space and offers greater installation flexibility. The interaction of the coupled inductors also improves the stability and reliability of the power supply and extends its service life.

[0036] The above description is merely a preferred embodiment of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0037] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications based on these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of this application.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An emergency power supply for an electric mine truck, characterized in that The application relates to an emergency power supply. The high-voltage battery input side comprises a capacitor C1 and a discharge resistor R1, a power module VQ1, a power module VQ2, a coupling inductor L1, the low-voltage battery output side comprises a capacitor C2 and a discharge resistor R2, a current detection circuit, a voltage detection circuit and a control unit; wherein, The high-voltage battery input side is connected to the capacitor C1 and the discharge resistor R1 of the high-voltage battery input side in parallel through a composite busbar, and the C1 pole and the E2 pole of the power modules VQ1 and VQ2 are simultaneously connected, the E1 pole and the C2 pole of the power modules VQ1 and VQ2 are respectively connected in series and connected to the coupling inductor L1, the other end of the coupling inductor L1 is connected to the positive pole of the low-voltage side in series, the E2 poles of the power modules VQ1 and VQ2 are connected to the negative pole of the low-voltage side in series, and the capacitor C2 and the discharge resistor R2 of the low-voltage battery output side are connected in parallel between the positive pole and the negative pole of the low-voltage side. The detection circuit is configured to detect the bus voltage of the high-voltage side and the low-voltage side, the temperature of the power module and the bus current.

2. An emergency power supply for an electrically powered mine truck as claimed in claim 1, characterised in that, The voltage detection circuit and the current detection circuit are respectively configured to detect the voltage signal and the current signal of the emergency power supply.

3. An emergency power supply for an electrically powered mine truck as claimed in claim 2, characterised in that, The control unit is connected with the power modules VQ1 and VQ2 respectively, and is configured to acquire the voltage signal detected by the voltage detection circuit and control the opening and closing of the power modules.

4. An emergency power supply for an electrically powered mine truck as claimed in claim 3, characterised in that, The emergency power supply is connected to a standby battery on the low-voltage side and connected to a whole-vehicle power supply on the high-voltage side, the emergency power supply is configured to charge the standby battery with the power supply in the whole-vehicle power grid and store energy, and when the main power battery is abnormal or the power is too low, the standby battery supplies power to the whole-vehicle power grid.

5. An emergency power supply for an electrically powered mine truck as claimed in claim 1, characterised in that, ​

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