Vehicle-mounted multifunctional power supply system and output control method

Abstract

The invention discloses a vehicle-mounted multifunctional power supply system and an output control method. The system is composed of a power supply input device, an energy storage conversion power supply and a power distribution unit. The power supply input device is used for power supply input and automatic switching of power supply input channels. The power supply input comprises commercial power input and 20kW three-phase self-generating power input. The energy storage conversion power supply is used for power supply input conversion, power supply storage, power supply management, power supply output conversion, direct current conversion and low-temperature heating; the power distribution unit is used for multi-path power distribution, multi-path power input and output protection and power remote control. The power supply system is composed of a power supply input device, an energy storage conversion power supply and a power distribution unit, and through power supply input conversion, power supply storage, power supply management, power supply output conversion, direct current conversion and low-temperature heating, multi-path power supply distribution, multi-path power supply input and output protection and power supply remote control are achieved. And the control requirement of vehicle-mounted high-power equipment on the electric quantity is met.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted power supply, and in particular to a vehicle-mounted multifunctional power supply system and an output control method. Background Art

[0002] High-power equipment on vehicles has higher requirements for power, output power, charging power, safety protection, environmental adaptability and ease of operation. Conventionally, a separate power supply vehicle is used to generate power through a diesel generator to achieve power output. This usage method not only requires additional equipment configuration units, but also brings additional workload for equipment cable connection and equipment control, and also affects the road passability of the vehicle-mounted equipment.

[0003] Therefore, this solution proposes a vehicle-mounted multi-functional power system and an output control method to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a vehicle-mounted multifunctional power supply system and an output control method to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a vehicle-mounted multifunctional power supply system, the power supply system comprising a power input device, an energy storage conversion power supply and a power distribution unit;

[0006] The power input device is used for power input and automatic switching of power input channels, and the power input includes mains input and 20kW three-phase self-generated power input;

[0007] The energy storage conversion power supply is used for power input conversion, power storage, power management, power output conversion, DC conversion and low-temperature heating;

[0008] The power distribution unit is used for multi-channel power distribution, multi-channel power input and output protection, and power remote control.

[0009] Preferably, the power input device includes a 20kW three-phase self-generating unit and a power supply combination;

[0010] The 20kW three-phase self-generating unit is arranged on the vehicle chassis and is used for charging the energy storage conversion power supply;

[0011] The power supply is arranged at the rear of the vehicle and is used for input protection and input channel switching when the vehicle is charging.

[0012] Preferably, the power supply unit comprises a ground connection module, a mains input port and a power distribution switching module;

[0013] The ground wire connection module is used to connect the ground wire when parking;

[0014] The output end of the mains input port is electrically connected to the input end of the power distribution switching module, and the output end of the 20kW three-phase self-generating unit is electrically connected to the input end of the power distribution switching module;

[0015] The power distribution switching module is used for input switching between mains power and self-generated power.

[0016] Preferably, when the mains power and self-generated power are connected to the power distribution switching module at the same time, the mains power is output first and then the self-generated power is output, and the power output is provided with a circuit breaker and a leakage protector for overcurrent protection.

[0017] Preferably, the energy storage conversion power supply is arranged in the middle of the vehicle-mounted cabin, and the energy storage conversion power supply includes a charger, an inverter module, a DC / DC module, a battery management unit and a lithium battery pack, and CAN communication is arranged between the vehicle-mounted charger, the inverter module, the DC / DC module, the battery management unit and the lithium battery pack for interaction, and the battery management unit main control node is arranged in the lithium battery pack, and interacts with the battery management system central control through a control interface.

[0018] Preferably, the charger converts AC power into DC power for charging the lithium battery pack, the lithium battery pack and the inverter module convert DC power into AC power for output, and the DC / DC module is used for DC output.

[0019] Preferably, the energy storage conversion power supply also includes a temperature sensor, an electric heating film and an air cooling unit. The temperature sensor is used to monitor the temperature of the lithium battery pack. The power ends of the electric heating film and the air cooling unit are electrically connected to the output ends of the charger respectively. The electric heating film and the air cooling unit are used for heating and heat dissipation of the lithium battery pack respectively through temperature feedback from the temperature sensor.

[0020] Preferably, the power distribution unit comprises a power distribution box and a remote control box;

[0021] The remote control box is provided with a control switch for output control of the energy storage conversion power supply, and the power supply of the remote control box is provided by the distribution box;

[0022] The distribution box is used for distribution, control and detection of input power.

[0023] Preferably, the distribution box is provided with a phase sequence protector, an AC contactor, a DC contactor, a current transmitter and a plurality of electrical parameter inspection modules.

[0024] An output control method for a vehicle-mounted multifunctional power supply system adopts the power supply system, and the control method comprises the following steps:

[0025] In the first step, the software in the energy storage conversion power supply detects that the discharge switch signal is valid;

[0026] The second step is to determine whether the battery is normal and the emergency switch is invalid;

[0027] The third step is to determine whether the temperature of the energy storage conversion power supply is lower than -20°C. If it is lower than -20°C, start heating;

[0028] The fourth step is to determine whether the temperature is greater than 5°C. If it is greater than 5°C, stop heating;

[0029] The fifth step is to control the output of the energy storage conversion power supply by controlling the discharge after the discharge signal is detected.

[0030] Technical effects and advantages of the present invention:

[0031] The power supply system of the present invention is composed of a power input device, an energy storage conversion power supply and a distribution unit. Through power input conversion, power storage, power management, power output conversion, DC conversion and low-temperature heating, multi-channel power distribution, multi-channel power input and output protection and power remote control are realized, which solves the requirements of vehicle-mounted high-power equipment for power, output power, charging power, safety protection, environmental adaptability and operational convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the system composition of the present invention.

[0033] Figure 2 The figure is a schematic diagram of the composition principle of the system of the present invention.

[0034] Figure 3 Output control flow chart for the present invention.

[0035] Figure 4 It is a schematic diagram of the composition principle of power closure of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1, the present invention provides as follows Figure 1 and Figure 2 The vehicle-mounted multifunctional power supply system shown is composed of a power input device, an energy storage conversion power supply and a power distribution unit;

[0038] The power input device is used for power input and automatic switching of power input channels. The power input includes AC input and 20kW three-phase self-generated power input;

[0039] Specifically, the power input device includes a 20kW three-phase self-generating unit and a power supply combination;

[0040] The 20kW three-phase self-generating unit is installed on the vehicle chassis and is used to charge the energy storage conversion power supply;

[0041] It should be noted that the 20kW three-phase self-generating unit in the power input device is attached to the vehicle chassis, which does not change the basic performance of the vehicle or the driving characteristics of the vehicle. It has the characteristics of small size, light weight, high reliability and good environmental adaptability. Under outdoor parking conditions, it can meet the charging needs of energy storage conversion power supply, etc. The output voltage is 380V, 20KW. The 20kW three-phase self-generating unit consists of 1 output type power take-off device (power take-off), speed adaptive device (PTO speed controller), fixed steering support frame, BJ212 transmission shaft, rare earth permanent magnet synchronous power frequency generator and fixed installation structure;

[0042] Pull up the handbrake and start the vehicle. When the vehicle air pressure is greater than 0.6MPa, put the vehicle transfer case in neutral; step on the clutch pedal, shift the transmission to fifth gear, and close the PTO switch. At this time, the power take-off should engage. Slowly release the clutch pedal and the engine speed will automatically increase to the set speed (1467rpm); the rare earth permanent magnet synchronous industrial frequency generator stably outputs three-phase AC400V / 50Hz alternating current.

[0043] The power supply is installed at the rear of the vehicle and is used for input protection and input channel switching when the vehicle is charging.

[0044] Furthermore, the power supply unit includes a ground connection module, a mains input port and a power distribution switching module;

[0045] The ground connection module is used to connect the ground wire when parking;

[0046] The output end of the mains input port is electrically connected to the input end of the power distribution switching module, and the output end of the 20kW three-phase self-generating unit is electrically connected to the input end of the power distribution switching module;

[0047] The power distribution switching module is used for input switching between mains power and self-generated power.

[0048] When the AC power and self-generated power are connected to the power distribution switching module at the same time, the AC power is output first and then the self-generated power. The power output is equipped with a circuit breaker and a leakage protector for overcurrent protection.

[0049] It should be noted that the reference Figure 4As shown, the power input device is installed at the rear of the vehicle. When the vehicle is parked, it is connected to the ground wire and the AC input connection port. It also has input protection and input channel switching functions. The AC power is output to the power distribution switching module through the AC input port; the on-board self-generated power generated by the 20kW three-phase self-generating unit is output to the power distribution switching module. When the two input power supplies of the power distribution switching module exist at the same time, the AC input has priority output; when there is only one input power supply, this power supply is output; the power output is protected by the circuit breaker / leakage protection, and the output is protected from overcurrent. The ground wire connection of the power input needs to be safely grounded to ensure the safe operation of the on-board multi-functional power supply system.

[0050] Energy storage conversion power supply is used for power input conversion, power storage, power management, power output conversion, DC conversion and low temperature heating;

[0051] Specifically, the energy storage conversion power supply is arranged in the middle of the vehicle-mounted cabin. The energy storage conversion power supply includes a charger, an inverter module, a DC / DC module, a battery management unit and a lithium battery pack. CAN communication is arranged between the vehicle-mounted charger, the inverter module, the DC / DC module, the battery management unit and the lithium battery pack for interaction. The main control node of the battery management unit is arranged in the lithium battery pack and interacts with the battery management system central control through a control interface.

[0052] It should be noted that the energy storage conversion power supply is installed in the middle of the vehicle-mounted cabin. The charger converts 380VAC AC power into 320V DC power to charge the lithium battery. The lithium battery module converts 320VDC DC power into 380VAC AC power output through the inverter module. At the same time, the DC / DC module converts 320VDC into 24VDC output through DC-DC conversion to meet the power supply needs of the entire load equipment. CAN communication is used for interaction within the system. The system master control node is located in the lithium battery pack and interacts with the central control through the control interface.

[0053] The on-board charger consists of an input filter, a three-phase power factor correction rectifier module and an interleaved parallel phase-shifted full-bridge. The input filter is used to improve the battery compatibility of the entire machine. The input three-phase 380V AC is corrected by a three-phase power factor correction rectifier module to convert the AC into ±400V DC as the bus voltage. In order to improve the efficiency of the charger and reduce the filter volume, an interleaved parallel phase-shifted full-bridge is adopted, the converter adopts a peak current control method, and the two automatic balanced outputs adopt a full-wave rectification method. The overall output is 320V DC to charge the lithium battery.

[0054] The inverter module is an AC380V inverter, which is mainly composed of a buck-boost circuit and a three-level half-bridge inverter circuit.

[0055] The DC-DC module adopts a two-stage design mode. In order to reduce the radiation problem caused by the input cable, a BOOST boost stage is added to the input. Using continuous input current, the BOOST circuit raises the battery voltage to a constant 380V, and then converts it into a 24V DC output through the second-stage LLC resonant change circuit.

[0056] Furthermore, the charger converts AC power into DC power for charging the lithium battery pack, the lithium battery pack and the inverter module convert DC power into AC power output, and the DC / DC module is used for DC output.

[0057] The energy storage conversion power supply also includes a temperature sensor, an electric heating film and an air cooling unit. The temperature sensor is used to monitor the temperature of the lithium battery pack. The power ends of the electric heating film and the air cooling unit are electrically connected to the output ends of the charger respectively. The electric heating film and the air cooling unit are used for heating and heat dissipation of the lithium battery pack respectively through the temperature feedback of the temperature sensor.

[0058] It should be noted that the lithium battery pack includes a battery management unit (also known as: BMS control unit) and 7 battery cells. Each battery cell contains 13 lithium iron phosphate cells, 14 heating films, 4 temperature acquisition units, a cell balancing module and an AFE cell status acquisition unit.

[0059] As the main control unit of the lithium battery pack, the BMS control unit has the functions of single cell voltage collection, passive balancing, regional temperature collection, heater control, heat dissipation control, total voltage and total current collection, SOC estimation, output relay drive and interaction with the vehicle interface.

[0060] It should be noted that the operating principle of the heating method is:

[0061] The lithium battery pack is powered by mains electricity or a generator. Under low temperature conditions, the electric heating film is directly powered by the charger, ensuring the output of energy storage conversion power under low temperature conditions.

[0062] There are 4 temperature sensors in each battery cell, one temperature sensor on each PCB board, a total of 36 temperature sensors, and the temperature sensors are assigned to each battery cell module where the temperature changes. The temperature value in each battery cell module is accurately detected through the AFE front-end acquisition chip, and each temperature point is monitored in real time through the BMS control unit. When the temperature is -40°C and the charger is connected to the output, the BMS control unit controls the heating relay to close and quickly heat the battery cell until the temperature reaches -20°C. The BMS control unit controls the discharge relay to close, and the battery pack can discharge normally. When the detected temperature reaches above 0°C, the BMS control unit controls the charging relay to close, and the charger can charge the lithium battery pack normally, while turning off the heating relay.

[0063] The operating principle of the heat dissipation method is:

[0064] At high temperatures, the lithium battery pack uses an air cooling system to dissipate heat, using the forced flow of air to cool the battery pack. The components include fans, flow channels and radiators, which are processed by circuit board optimization and heat conduction. All internal power modules use mature heat conduction methods to dissipate heat. In order to improve the external radiation and conduction heat dissipation capabilities of the casing, the following measures are taken:

[0065] The module heat dissipation surface is in direct contact with the housing to ensure low thermal resistance of the heat conduction path of the main heat-generating components.

[0066] When designing a printed circuit board, high-power chips such as power modules and other components should be dispersed to make the heat inside the device as even as possible and avoid thermal effects between high-power modules.

[0067] The power distribution unit is used for multi-channel power distribution, multi-channel power input and output protection, and power remote control.

[0068] Specifically, the power distribution unit includes a distribution box and a remote control box;

[0069] A control switch is provided at the remote control box for output control of the energy storage conversion power supply, and the power supply of the remote control box is provided by the distribution box;

[0070] It should be noted that the remote control box is provided with switches 1 to 11. Switch 1 (system main power switch) realizes the output control of the energy storage conversion power supply. After receiving the system main power switch signal, the energy storage conversion power supply starts working and sends a group of AC380V, a group of DC24V and a group of DC285V power supplies to the distribution box; switches 2 to 11 respectively control the power consumption of multiple loads. The switch command on the remote control box is sent to the distribution box through RS485. After receiving the command, the distribution box performs power on / off operations on the corresponding load equipment. The power supply of the remote control box is provided by the distribution box.

[0071] The distribution box is used for the distribution, control and detection of input power.

[0072] The distribution box is equipped with a phase sequence protector, an AC contactor, a DC contactor, a current transmitter and multiple electrical parameter inspection modules.

[0073] It should be noted that the distribution box is equipped with a phase sequence protector, AC contactor, DC contactor, current transmitter and multiple electrical parameter inspection modules to distribute, control and detect the input power, and transmit the relevant data to the remote control box via RS485. When any output is over-current protected, the corresponding output is automatically shut down without affecting other outputs.

[0074] The operating principle is that the charging process is as follows: the power input device inputs the input charging power into the distribution box, which automatically switches the input power and distributes it to the charger. The charger receives the power control signal output by the lithium battery pack through the communication interface to control the charging, and finally outputs high-voltage DC power to the lithium battery pack.

[0075] The power distribution process is as follows: the lithium battery pack receives an external control signal and starts the high-voltage DC discharge output of the lithium battery pack. The high-voltage DC power output of one set of discharge interfaces is output to the AC380V inverter to output AC380V power; the high-voltage DC power output of another set of discharge interfaces is output to the DC-DC module to output DC24V power. The AC380V power supply, the DC24V power supply, and the high-voltage DC power output of the lithium battery pack discharge interface are sent to the distribution box, which is controlled by the remote control box to realize the output of power distribution and the distribution function of AC380V power supply, DC24V power supply and high-voltage DC.

[0076] Embodiment 2, the present invention provides as follows Figure 3 The output control method of a vehicle-mounted multifunctional power supply system shown in the figure adopts the power supply system of the first embodiment, and the control method comprises the following steps:

[0077] In the first step, the software in the energy storage conversion power supply detects that the discharge switch signal is valid;

[0078] The second step is to determine whether the battery is normal and the emergency (emergency stop) switch is invalid;

[0079] The third step is to determine whether the temperature of the energy storage conversion power source (lithium battery pack) is lower than -20°C. If it is lower than -20°C, start heating;

[0080] The fourth step is to determine whether the temperature is greater than 5°C. If it is greater than 5°C, stop heating;

[0081] The fifth step is to control the output of the energy storage conversion power supply by controlling the discharge after the discharge signal is detected.

[0082] It should be noted that the specific operation of the fifth step is to determine whether the discharge contactor is closed. If not, close the charging relay, close the discharge relay after 3 seconds, and then disconnect the pre-charging relay to allow the device to output.

[0083] After the software detects that the discharge switch signal is valid, it controls the discharge relay to realize the output control function of the lithium battery pack. When the lithium battery pack has no faults, the discharge relay is closed (the specific process is: first close the pre-charge relay, then close the discharge relay after 3 seconds, and then disconnect the pre-charge relay; this process needs to be executed each time the discharge relay changes from the open state to the closed state), allowing the device to output; when the battery fails or the discharge switch signal is invalid, the discharge relay is controlled to turn off and the device output is disconnected.

[0084] The power output control method needs to judge the external control command and detect the temperature of the lithium battery pack. When the battery temperature is detected to be too low (5°C), the heating process should be started and stopped when it reaches 20°C.

[0085] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle-mounted multifunctional power supply system, characterized in that: The power supply system is composed of a power input device, an energy storage conversion power supply and a power distribution unit; The power input device is used for power input and automatic switching of power input channels, and the power input includes mains input and 20kW three-phase self-generated power input; The energy storage conversion power supply is used for power input conversion, power storage, power management, power output conversion, DC conversion and low-temperature heating; The power distribution unit is used for multi-channel power distribution, multi-channel power input and output protection, and power remote control.

2. The vehicle-mounted multifunctional power supply system according to claim 1, characterized in that: The power input device includes a 20kW three-phase self-generating unit and a power supply combination; The 20kW three-phase self-generating unit is arranged on the vehicle chassis and is used for charging the energy storage conversion power supply; The power supply is arranged at the rear of the vehicle and is used for input protection and input channel switching when the vehicle is charging.

3. The vehicle-mounted multifunctional power supply system according to claim 2, characterized in that: The power supply unit includes a ground connection module, a mains power input port and a power distribution switching module; The ground wire connection module is used to connect the ground wire when parking; The output end of the mains input port is electrically connected to the input end of the power distribution switching module, and the output end of the 20kW three-phase self-generating unit is electrically connected to the input end of the power distribution switching module; The power distribution switching module is used for input switching between mains power and self-generated power.

4. The vehicle-mounted multifunctional power supply system according to claim 3, characterized in that: When the mains power and self-generated power are connected to the power distribution switching module at the same time, the mains power is output first and then the self-generated power is output, and the power output is provided with a circuit breaker and a leakage protector for overcurrent protection.

5. The vehicle-mounted multifunctional power supply system according to claim 1, characterized in that: The energy storage conversion power supply is arranged in the middle of the vehicle-mounted cabin, and the energy storage conversion power supply includes a charger, an inverter module, a DC / DC module, a battery management unit and a lithium battery pack. CAN communication is arranged between the vehicle-mounted charger, the inverter module, the DC / DC module, the battery management unit and the lithium battery pack for interaction. The main control node of the battery management unit is arranged in the lithium battery pack, and interacts with the battery management system central control through a control interface.

6. The vehicle-mounted multifunctional power supply system according to claim 5, characterized in that: The charger converts AC power into DC power for charging the lithium battery pack, the lithium battery pack and the inverter module convert DC power into AC power for output, and the DC / DC module is used for DC output.

7. The vehicle-mounted multifunctional power supply system according to claim 5, characterized in that: The energy storage conversion power supply also includes a temperature sensor, an electric heating film and an air cooling unit. The temperature sensor is used to monitor the temperature of the lithium battery pack. The power supply ends of the electric heating film and the air cooling unit are electrically connected to the output ends of the charger respectively. The electric heating film and the air cooling unit are used for heating and dissipating heat of the lithium battery pack respectively through temperature feedback from the temperature sensor.

8. The vehicle-mounted multifunctional power supply system according to claim 1, characterized in that: The power distribution unit includes a distribution box and a remote control box; The remote control box is provided with a control switch for output control of the energy storage conversion power supply, and the power supply of the remote control box is provided by the distribution box; The distribution box is used for distribution, control and detection of input power.

9. The vehicle-mounted multifunctional power supply system according to claim 8, characterized in that: The distribution box is provided with a phase sequence protector, an AC contactor, a DC contactor, a current transmitter and a plurality of electrical parameter inspection modules.

10. An output control method for a vehicle-mounted multifunctional power supply system, using the power supply system according to any one of claims 1 to 9, characterized in that: The control method comprises the following steps: In the first step, the software in the energy storage conversion power supply detects that the discharge switch signal is valid; The second step is to determine whether the battery is normal and the emergency switch is invalid; The third step is to determine whether the temperature of the energy storage conversion power supply is lower than -20°C. If it is lower than -20°C, start heating; The fourth step is to determine whether the temperature is greater than 5°C. If it is greater than 5°C, stop heating; The fifth step is to control the output of the energy storage conversion power supply by controlling the discharge after the discharge signal is detected.

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