Alternating current power supply equipment for mobile dining car

Abstract

The invention belongs to the technical field of mobile power supply equipment, and particularly relates to mobile dining car alternating current power supply equipment which comprises an electrical main loop and a matched BMS management system. The electrical main loop is divided into a direct current part, an inverter unit and an alternating current part; the direct current part is provided with an energy storage module and a direct current quick charging interface, and the direct current quick charging interface can quickly charge the energy storage module through an external charging pile under the current of 47A; the inverter unit can realize bidirectional AC / DC conversion. The charging efficiency is remarkably improved, the 47A direct-current quick charging interface is adopted to be matched with the current adaptation circuit, the single-time charging time is shortened to 1.5-2 hours and is improved by more than 60% compared with existing equipment, and the high-frequency energy charging requirement of the mobile dining car is met; safety protection is comprehensive and reliable, multi-parameter real-time monitoring and a three-level linkage protection mechanism are arranged, progressive protection of early warning, shutdown and outage is achieved, safety risks caused by single protection lag are avoided, and the equipment and personal safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mobile power supply equipment, in particular to an alternating current power supply equipment for a mobile food truck. BACKGROUND

[0002] As a flexible catering service carrier, the mobile food truck relies on stable alternating current power supply to drive electrical equipment such as refrigerators, microwave ovens, and electric fryers during operation. The alternating current power supply equipment commonly used in current mobile food trucks has two major problems:

[0003] Low efficiency of power supply: the existing equipment DC power supply interface is mostly adapted to 10-20A conventional current, and single power supply needs 3-5 hours, which is difficult to meet the demand of "short-time rapid power supply and high-frequency operation" of the mobile food truck, especially during peak operation period, and the time-consuming power supply easily leads to operation interruption;

[0004] Insufficient safety protection: the supporting management system mostly only monitors single parameters such as voltage or current, lacks multi-dimensional collaborative monitoring of temperature, leakage risk, etc., and the protection mechanism responds slowly (such as passive power-off only after parameter overrun), which is easy to cause fire or electric shock accidents due to equipment overheating and line leakage, threatening the safety of equipment and operators, so it is necessary to develop an alternating current power supply equipment for a mobile food truck. SUMMARY

[0005] This part aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract and title of the specification of the present application to avoid obscuring the purpose of this part, the abstract and the title of the specification, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0006] To solve the above technical problems, according to one aspect of the present application, the present application provides the following technical scheme:

[0007] The alternating current power supply equipment for a mobile food truck comprises an electrical main circuit and a supporting BMS management system;

[0008] The electrical main circuit is divided into a DC part, an inverter unit and an AC part;

[0009] The DC part is provided with an energy storage module and a DC fast charging interface, and the DC fast charging interface can quickly charge the energy storage module through an external charging pile under a current of 47A;

[0010] The inverter unit can realize bidirectional AC-DC conversion, convert external input AC into DC and store it in the energy storage module when charging the equipment, and convert the DC output by the energy storage module into AC when discharging the equipment;

[0011] The AC part is provided with an external discharge interface and integrates a leakage protection function;

[0012] The BMS management system is used for setting the charge-discharge power threshold of the equipment, collecting and monitoring the temperature, voltage and current parameters of the system in real time, and setting the protection parameters to realize the safety protection of the equipment and the operating personnel.

[0013] As a preferred scheme of the mobile dining car AC power supply equipment, the DC part further comprises a current adaptation circuit, and the current adaptation circuit is internally provided with a current limiting resistor and a voltage stabilizing chip, so as to adapt the 47A large current input by the charging pile to the rated charging demand of the energy storage module, and avoid damage of the energy storage module caused by current impact.

[0014] As a preferred scheme of the mobile dining car AC power supply equipment, the inverter unit is a single-phase hybrid inverter, and the control chip is a digital signal processor.

[0015] As a preferred scheme of the mobile dining car AC power supply equipment, the external discharge interface of the AC part is a plurality of specification interfaces, at least including a 220V specification interface, so as to adapt to different power electrical equipment such as the refrigerator, microwave oven and electric fryer of the mobile dining car.

[0016] The leakage protection function is realized by a residual current operating circuit breaker, and the rated residual operating current of the circuit breaker is ≤30mA.

[0017] As a preferred scheme of the mobile dining car AC power supply equipment, the protection parameter setting of the BMS management system forms a three-level progressive protection mechanism.

[0018] The preset high-low voltage three-level protection threshold is:

[0019] The first level of charging early warning is that when the temperature is greater than 48 DEG C, the voltage is greater than 388.8V or the current is greater than 65A, the system triggers the charging stop when any condition is met.

[0020] The second level of charging early warning is that when the temperature is greater than 56 DEG C, the voltage is greater than 394.2V or the current is greater than 68A, the system triggers the charging stop when any condition is met, and the battery pack connection is disconnected.

[0021] The third level of charging early warning is that when the temperature is greater than 61 DEG C, the voltage is greater than 399.6V or the current is greater than 70A, the system triggers the charging stop when any condition is met, and the battery pack connection is disconnected.

[0022] The first level of discharging early warning is that when the temperature is greater than 48 DEG C or the current is greater than 65A, the system triggers the discharging stop when any condition is met; and when the voltage is less than 313.2V, the low power alarm is triggered.

[0023] Level 2 Discharge Warning: When the temperature is >48℃ or the current is >65A, the system will trigger a discharge shutdown if either condition is met; if the voltage is <302.4V, the background system will trigger a strong charging indicator and then trigger a discharge shutdown.

[0024] Level 3 Discharge Warning: When the temperature is greater than 61℃ or the current is greater than 70A, the system will trigger a discharge shutdown and disconnect the battery pack when either condition is met; if the voltage is less than 291.6V, the background will trigger a strong charging indicator, trigger a discharge shutdown, and disconnect the battery pack.

[0025] As a preferred embodiment of the AC power supply equipment for mobile food carts described in this invention, it further includes a background interactive function. The interactive module is a mobile phone background, used to display the charging and discharging status of the device, real-time parameters of temperature, voltage, and current, as well as protection threshold settings, and to query parameters, modify protection thresholds, and view fault records for the past 30 days.

[0026] The beneficial effects of this invention are:

[0027] 1. The charging efficiency is significantly improved. With the adoption of a 47A DC fast charging interface and a current adapter circuit, the charging time for a single charge is shortened to 1.5 to 2 hours, which is more than 60% higher than the existing equipment, meeting the high-frequency charging needs of mobile food carts.

[0028] 2. Comprehensive and reliable safety protection: The multi-parameter real-time monitoring and three-level linkage protection mechanism enable progressive protection through early warning, shutdown, and power failure, avoiding safety risks caused by lagging single protection and ensuring the safety of equipment and personnel.

[0029] 3. High ease of operation: Parameter settings and status queries are displayed visually in the backend, eliminating the need for professional personnel and lowering the barrier to entry for mobile food truck operators. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0031] Figure 1 This is a circuit diagram of the present invention. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0036] Please see Figure 1 The diagram shown is a circuit diagram of an embodiment of the AC power supply device for a mobile food cart according to the present invention. Please refer to [link / reference]. Figure 1 This section provides a detailed introduction to the AC power supply equipment for mobile food trucks.

[0037] This invention provides an AC power supply device for mobile food trucks, including an electrical main circuit, a BMS intelligent management system, and a human-machine interaction module, with the specific structure as follows:

[0038] The main electrical circuit includes a current unit, an inverter unit, and an AC unit;

[0039] The DC unit includes an energy storage module, which uses a lithium iron phosphate battery pack with a capacity of 10kWh to 35kWh, a DC fast charging interface, and a current adaptation circuit. The DC fast charging interface has a rated current of 60A, is compatible with mainstream DC charging piles on the market, and can be directly connected to the charging pile for fast charging. The current is controlled by the BMS main controller in the product, which is model LM317. It can stably adapt the current input from the charging pile to the charging needs of the energy storage module, avoiding current surges that could damage the energy storage battery module.

[0040] The inverter unit is a single-phase hybrid inverter, with the core chip being TI's TMS320F28335DSP, used to achieve bidirectional conversion between AC and DC during charging and DC and AC during discharging, with a conversion efficiency of ≥98%.

[0041] The AC section has multiple external discharge interfaces, including at least a 220V interface, to facilitate compatibility with different power devices in mobile food carts. The interface also integrates a leakage protection module, which uses a residual current operated circuit breaker with a rated residual operating current ≤30mA to achieve rapid disconnection of leakage current in AC output.

[0042] The BMS intelligent management system includes a parameter monitoring module, a power setting module, and a multi-level protection module.

[0043] The parameter monitoring module uses a PT100 temperature sensor, an ACS712 voltage sensor, and an INA219 current sensor to collect the temperature of the energy storage module in real time. The monitoring range is -20℃ to 61℃, the voltage range is 0V to 500V, and the charging and discharging current range is -47A to 47A. The data sampling frequency is 1Hz to ensure the real-time performance of the parameters.

[0044] The power setting module supports setting the charging and discharging power thresholds via the human-machine interaction module and a touch screen. The upper limit of the charging power is 5kW and the upper limit of the discharging power is 3kW. The system automatically adjusts the charging and discharging current according to the set values ​​to avoid overload.

[0045] The multi-level protection module includes preset high and low voltage three-level protection thresholds:

[0046] Level 1 charging warning: When any of the following conditions are met (temperature > 48℃, voltage > 388.8V, or current > 65A), the system will trigger a charging shutdown.

[0047] Level 2 charging warning: When the temperature is greater than 56℃, the voltage is greater than 394.2V, or the current is greater than 68A, the system will trigger a charging shutdown and disconnect the battery pack when any of these conditions are met.

[0048] Three-level charging warning: When the temperature is >61℃, the voltage is >399.6V or the current is >70A, the system will trigger a charging shutdown and disconnect the battery pack when any of these conditions are met.

[0049] Level 1 Discharge Warning: When the temperature is >48℃ or the current is >65A, the system will trigger a discharge shutdown if either condition is met; if the voltage is <313.2V, a low battery alarm will be triggered.

[0050] Level 2 Discharge Warning: When the temperature is >48℃ or the current is >65A, the system will trigger a discharge shutdown if either condition is met; if the voltage is <302.4V, the background system will trigger a strong charging indicator and then trigger a discharge shutdown.

[0051] Level 3 Discharge Warning: When the temperature is greater than 61℃ or the current is greater than 70A, the system will trigger a discharge shutdown and disconnect the battery pack when either condition is met; if the voltage is less than 291.6V, the background will trigger a strong charging indicator, trigger a discharge shutdown, and disconnect the battery pack.

[0052] The present invention will be further described in detail below with reference to specific embodiments:

[0053] During equipment assembly, the energy storage module uses 108 100Ah lithium iron phosphate batteries connected in series, with a total voltage of 345.6V and a capacity of 34.56kWh.

[0054] The DC fast charging interface uses a waterproof aviation plug, model WS28, with a rated current of 80A. It is installed on the side of the device and equipped with a dust cover.

[0055] The inverter unit is based on the TMS320F28335DSP, with a half-bridge inverter circuit built on the periphery. The input voltage is 36V, the output voltage is 220VAC, and the frequency is 50Hz.

[0056] The BMS management system hardware uses an STM32F103C8T6 MCU, which connects to a PT100 temperature sensor, an ACS712 voltage sensor, and an INA219 current sensor. The software is developed based on the FreeRTOS system to realize parameter acquisition, logic judgment, and protection control.

[0057] The workflow includes a charging mode and a discharging mode;

[0058] In the replenishment mode: the device's DC fast charging interface is connected to a 50A DC charging pile. After the BMS system detects the charging signal, it inputs a stable 47A current to the energy storage module through the current adapter circuit, while monitoring the temperature and voltage in real time. When the energy storage module voltage reaches 388.8V and is fully charged, the system automatically cuts off the charging circuit to complete the replenishment.

[0059] Discharge mode: When the electrical equipment of the mobile food cart is connected to the AC output interface, the BMS system adjusts the inverter output according to the set discharge power (e.g., 12kW) and monitors the discharge current in real time; if leakage is detected (residual current > 30mA), the leakage protection module cuts off the AC output within 0.1 seconds, and the BMS background alarm is triggered at the same time.

[0060] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. Mobile trolley AC power supply equipment, comprising an electrical main circuit and a matching BMS management system, characterized in that ； The electrical main circuit is divided into a direct current part, an inverter unit and an alternating current part; The direct current part is provided with an energy storage module and a direct current fast charging interface, the direct current fast charging interface can quickly charge the energy storage module through an external charging pile under a 47A current; The inverter unit can realize bidirectional AC / DC conversion, convert external input AC into DC and store it in the energy storage module when charging the device, and convert the DC output by the energy storage module into AC when discharging the device; The alternating current part is provided with an external discharge interface and integrated leakage protection function; The BMS management system is used for setting the charge and discharge power threshold of the device, collecting and monitoring the temperature, voltage and current parameters of the system in real time, and setting protection parameters to realize safety protection of the device and operating personnel.

2. The mobile cart AC power supply of claim 1, wherein, The direct current part further includes a current adaptation circuit, the current adaptation circuit is internally provided with a current limiting resistor and a voltage stabilizing chip, which is used to stabilize and adapt the 47A large current input by the charging pile to the rated charging requirement of the energy storage module, so as to avoid damage to the energy storage module caused by current impact.

3. The mobile cart AC power supply of claim 1, wherein, The inverter unit is a single-phase hybrid inverter, including a control chip, and the control chip is a digital signal processor.

4. The mobile cart AC power supply of claim 1, wherein, The external discharge interface of the alternating current part is a plurality of specification interfaces, at least including a 220V specification interface, which is used to adapt to different power electrical equipment such as refrigerators, microwave ovens and electric fryers of mobile food trucks; The leakage protection function is realized by a residual current operating circuit breaker, and the rated residual operating current of the circuit breaker is ≤30mA.

5. The mobile cart AC power supply apparatus of claim 1, wherein, The protection parameter setting of the BMS management system forms a three-level progressive protection mechanism: The preset high and low voltage three-level protection threshold: Charging first warning: when the temperature is greater than 48℃, the voltage is greater than 388.8V or the current is greater than 65A, the system triggers charging stop when any condition is met; Charging second warning: when the temperature is greater than 56℃, the voltage is greater than 394.2V or the current is greater than 68A, the system triggers charging stop when any condition is met, and the battery pack connection is disconnected at the same time; Charging third warning: when the temperature is greater than 61℃, the voltage is greater than 399.6V or the current is greater than 70A, the system triggers charging stop when any condition is met, and the battery pack connection is disconnected at the same time; Discharge first warning: when the temperature is greater than 48℃ or the current is greater than 65A, the system triggers discharge stop when any condition is met; When the voltage is less than 313.2V, a low power alarm is triggered; Discharge second warning: when the temperature is greater than 48℃ or the current is greater than 65A, the system triggers discharge stop when any condition is met; if the voltage is less than 302.4V, the background triggers a strong charging mark, and discharge stop is triggered; Discharge third warning: when the temperature is greater than 61℃ or the current is greater than 70A, the system triggers discharge stop when any condition is met, and the battery pack connection is disconnected at the same time; if the voltage is less than 291.6V, the background triggers a strong charging mark, and discharge stop is triggered, and the battery pack connection is disconnected at the same time.

6. The mobile cart AC power supply apparatus of claim 1, wherein, It further includes a background interaction function, the interaction module is a mobile phone background, which is used to display the device charge and discharge state, temperature, voltage, current real-time parameters and protection threshold setting value in real time, as well as parameter query, protection threshold modification and near 30-day fault record viewing.

Images