Charging and discharging control method and power supply controller for new energy motor home

Abstract

The invention provides a charging and discharging control method and a power supply controller for a new energy motor home, and belongs to the technical field of new energy motor homes. In order to solve the problem that a power supply controller for a new energy motor home cannot provide alternating current while charging, the invention provides a charging and discharging control method which comprises the following steps: responding to a vehicle charging port complete connection signal, synchronizing a bidirectional vehicle-mounted charger and a mains supply phase, after the phase synchronization, the power supply of the alternating current electric appliance in the vehicle is switched from the inversion power supply of the bidirectional vehicle-mounted charger to the commercial power supply; in response to a charging permission instruction, charging a vehicle power battery through the bidirectional vehicle-mounted charger; and obtaining the total power of the in-vehicle alternating current electric appliance, and adjusting the charging power of the bidirectional vehicle-mounted charger or the total power of the in-vehicle alternating current electric appliance based on a first threshold value. According to the invention, the problem of simultaneous working of charging and inversion is solved, and the situation of interruption and restart of the electric devices in the vehicle in the charging and inversion switching process is ensured not to occur.

Description

Technical Field

[0001] The present application relates to the technical field of new energy recreational vehicles, and in particular to a charging and discharging control method and a power supply controller for new energy recreational vehicles. Background Art

[0002] RV power controllers generally include a charger and an inverter. When the RV is connected to the mains (such as the campground power supply), the charger converts 220V / 110V AC power into 12V / 24V DC power to charge the battery pack (such as lead-acid batteries, lithium batteries) in the RV living area, and directly powers the DC electrical appliances in the car (such as lighting, water pumps, etc.), but the AC appliances cannot work at this time; in an off-grid environment (such as camping in the wild), the DC power of the RV battery is converted into 220V / 110V AC power to drive high-power appliances (such as induction cookers, rice cookers, kettles, etc.).

[0003] In addition, most of the existing RV power controller products are single chargers and inverters, which are large in size, heavy in weight, have low protection levels, and have messy component wiring harnesses. They are usually suitable for low-voltage energy storage batteries (12V / 24V / 48V), with low power (2-5kWh) and low inverter power (3kW). When camping in the wild, they cannot meet the owner's simultaneous power consumption needs of high-power electrical appliances, seriously affecting the camping experience.

[0004] At present, major new energy vehicle manufacturers are actively promoting new energy or extended-range RVs, removing the low-voltage energy storage batteries of traditional RVs, and directly using high-voltage power battery packs to provide RVs with daily electricity. At the same time, charging piles are used to recharge the RVs, but existing RV chargers and inverters cannot meet the demand.

[0005] In addition, although the on-board chargers with V2L function on the market meet the charging and inverter functions of RVs, when the charger is in the process of inverting and discharging externally, when the charging gun is inserted to charge the vehicle, the charging and inverter functions of the charger cannot work at the same time. The charger will stop the inverter output before starting charging, resulting in the interruption of the use of AC electrical appliances in the car (such as induction cookers, rice cookers, air conditioners, etc.). Users need to restart the electrical equipment, which seriously affects the RV camping experience. Summary of the Invention

[0006] The purpose of this application is to solve the problem in the prior art that power controllers for new energy RVs cannot simultaneously charge and provide AC power. Therefore, this application provides a charge and discharge control method and a power controller for new energy RVs to solve the scenario of simultaneous charging and inverter operation, and ensure that the electrical components in the vehicle will not be interrupted and restarted during the charging and inverter switching process.

[0007] The present application provides a charge and discharge control method for a power supply controller for a new energy RV, wherein the power supply controller includes a bidirectional on-board charger. When the bidirectional on-board charger inverts and supplies power to AC electrical appliances in the vehicle, the method includes:

[0008] In response to a vehicle charging port fully connected signal, synchronizing the phases of the bidirectional on-board charger and the mains power supply, and switching the power supply of the AC electrical appliances in the vehicle from the inverter power supply of the bidirectional on-board charger to the mains power supply after the phase synchronization;

[0009] In response to the charging permission instruction, charging the vehicle power battery through the bidirectional on-board charger;

[0010] The total power of the AC electrical appliances in the vehicle is obtained, and the charging power of the bidirectional on-board charger or the total power of the AC electrical appliances in the vehicle is adjusted based on a first threshold.

[0011] In some embodiments, adjusting the charging power of the bidirectional onboard charger or the total power of the AC electrical appliances in the vehicle based on the first threshold includes:

[0012] Determine P_charge according to P_charge=P-P_house, where P is the first threshold, and the first threshold is the maximum charging power of the bidirectional on-board charger, P_charge is the adjusted charging power of the bidirectional on-board charger, and P_house is the total power of the AC electrical appliances in the vehicle;

[0013] If P_house is greater than P, adjust P_charge to 0 and trigger an overload alarm;

[0014] Otherwise, continue charging according to the current P_charge.

[0015] In some embodiments, in response to the overload alarm, a list of AC electrical appliances in the vehicle is displayed on a display screen, and a disconnection option is provided;

[0016] If any of the in-vehicle AC electrical appliances is disconnected from power supply, then return to confirm P_charge;

[0017] Otherwise, the bidirectional on-board charger is controlled to enter a standby mode.

[0018] In some embodiments, in response to a stop charging instruction, the bidirectional on-board charger is controlled to enter a sleep mode.

[0019] In some embodiments, the power controller for new energy RVs further includes a DC / DC module connected in parallel with the bidirectional on-board charger, and the DC / DC module is connected to the vehicle power battery, and further includes:

[0020] The DC / DC module is used to supply power to the DC electrical appliances in the vehicle.

[0021] The present application also provides a power supply controller for a new energy RV, which is used to connect to the vehicle power battery and the vehicle controller, and is characterized by including:

[0022] Bidirectional on-board charger, used to convert mains electricity into high-voltage direct current (HVDC), or convert HVDC into 220V AC;

[0023] a bypass switching module, configured to synchronize the bidirectional onboard charger and the mains phase in response to a vehicle charging port fully connected signal;

[0024] Power detection module, used to obtain the total power of AC electrical appliances in the car;

[0025] a controller configured to switch the power supply of the in-vehicle AC electrical appliances from the inverter power supply of the bidirectional on-board charger to the mains power supply after phase synchronization, and to adjust the charging power of the bidirectional on-board charger or the total power of the in-vehicle AC electrical appliances based on a first threshold; and

[0026] One end of the bidirectional on-board charger is used to be connected to the mains, and the other end is connected to the power detection module;

[0027] One end of the bypass switching module is used to be connected to the mains, and the other end is connected to the power detection module;

[0028] The power detection module is connected to all AC electrical appliances in the vehicle;

[0029] The controller is connected to the bypass switching module and the bidirectional on-board charger.

[0030] In some embodiments, the bypass switching module includes a phase-locked loop circuit and a static switch connected in sequence.

[0031] In some embodiments, further comprising:

[0032] The DC / DC module is used to power the DC electrical appliances in the vehicle; and

[0033] One end of the DC / DC module is connected to the power battery in the vehicle, and the other end is connected to the DC electrical appliance in the vehicle.

[0034] Beneficial effects:

[0035] This application meets the charging, power distribution and power consumption needs of new energy or extended-range RVs, solves the scenario where charging and inversion work at the same time, and ensures that the electrical devices in the vehicle will not be interrupted and restarted during the charging and inversion switching process.

[0036] Other features and corresponding beneficial effects of the present application are described in the latter part of the specification, and it should be understood that at least some of the beneficial effects become obvious from the description in the specification of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the method flow of this application;

[0038] Figure 2 This is a structural diagram of the power controller for the new energy RV of this application. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0041] Example 1:

[0042] See Figure 1 , Figure 1 Schematic diagram of the method flow of this application.

[0043] This embodiment of the present application provides a charge and discharge control method for a power controller for a new energy RV. The power controller includes a bidirectional onboard charger (OBC). This OBC, also known as a V2L (Vehicle-to-Live) mode onboard charger, converts the DC power from the vehicle's power battery into household 220V AC power for external devices. Preferably, the OBC has a charging power of 6.6kW and an inverter discharge power of 6kW.

[0044] This method is particularly suitable for when a bidirectional on-board charger (OBC) is used to invert and supply power to AC electrical appliances in a vehicle. The method includes:

[0045] S1 responds to the vehicle charging port fully connected signal, synchronizes the bidirectional vehicle charger and the mains phase, and after the phase synchronization, switches the power supply for the AC electrical appliances in the vehicle from the bidirectional vehicle charger inverter power supply to the mains power supply.

[0046] Usually, when a new energy RV needs to be charged, the charging gun is inserted into the charging port, the CC resistance is detected to be normal, and the electronic lock locks the connection between the charging gun and the charging port to achieve full connection of the vehicle charging port.

[0047] This step synchronizes the inverter output of the bidirectional on-board charger with the mains phase to ensure that the voltage waveforms are aligned during switching to avoid shock or power outage.

[0048] Preferably, this step is accomplished by a phase-locked loop (PLL) circuit in conjunction with a static switch.

[0049] S2 responds to the charging permission instruction and charges the vehicle power battery through the bidirectional on-board charger.

[0050] Among them, whether charging is allowed is usually controlled by the vehicle controller VCU.

[0051] If the vehicle controller VCU issues a command not to allow charging, preferably, the bidirectional on-board charger is controlled to enter a standby mode (STANDBY mode).

[0052] S3 obtains the total power of the AC electrical appliances in the vehicle and adjusts the charging power of the bidirectional onboard charger or the total power of the AC electrical appliances in the vehicle based on the first threshold.

[0053] In one embodiment, adjusting the charging power of the bidirectional onboard charger or the total power of AC electrical appliances in the vehicle based on the first threshold includes:

[0054] P_charge is determined based on P_charge = P - P_house, thereby ensuring the safe current of the wiring harness as much as possible and improving safety.

[0055] Wherein, P is a first threshold value. Preferably, the first threshold value is the maximum charging power of the bidirectional on-board charger, P_charge is the adjusted charging power of the bidirectional on-board charger, and P_house is the total power of the AC electrical appliances in the vehicle.

[0056] If P_house is greater than P, adjust P_charge to 0 and trigger an overload alarm.

[0057] Otherwise, continue charging according to the current P_charge.

[0058] In one embodiment, in response to the overload alarm, a list of AC electrical appliances in the vehicle is displayed on a display screen, and a disconnection option is provided.

[0059] If any AC appliance in the vehicle is disconnected from power supply, the system returns to confirm P_charge, thereby repeatedly determining the size of P_house and P and whether to continue charging based on the current P_charge.

[0060] Otherwise, without disconnecting any AC electrical appliances in the vehicle, the bidirectional on-board charger is controlled to enter the standby mode (STANDBY mode), at which time the OBC stops outputting.

[0061] Preferably, this step is completed by cooperation between the power detection module and the controller.

[0062] In one embodiment, in response to the stop charging instruction, the bidirectional onboard charger is controlled to enter a sleep mode.

[0063] Whether to stop charging is usually determined by the vehicle controller VCU based on the power battery SOC. When the power battery SOC is 100%, the VCU issues a stop charging instruction.

[0064] In one embodiment, the power controller for a new energy RV also includes a DC / DC module connected in parallel to a bidirectional onboard charger, and the DC / DC module is connected to the vehicle's power battery. The method also includes powering in-vehicle DC electrical appliances, preferably voltage-sensitive electrical appliances, via the DC / DC module, thereby enabling the method to meet both high and low voltage power requirements.

[0065] Example 2:

[0066] See Figure 2 , Figure 2 This is a structural diagram of the power controller for the new energy RV of this application.

[0067] An embodiment of the present application also provides a power controller for a new energy RV, which is used to connect to the vehicle's power battery and the vehicle controller VCU.

[0068] The power supply controller for the new energy RV includes a bidirectional on-board charger, a bypass switching module, a power detection module and a controller.

[0069] Among them, the bidirectional on-board charger is used to convert AC power into high-voltage direct current, or convert high-voltage direct current into 220V alternating current.

[0070] The bypass switching module is used to synchronize the bidirectional vehicle charger and the mains phase in response to the vehicle charging port fully connected signal.

[0071] The power detection module is used to obtain the total power of the AC electrical appliances in the vehicle.

[0072] The controller is used to switch the power supply of the AC electrical appliances in the vehicle from the inverter power supply of the bidirectional on-board charger to the mains power supply after phase synchronization, and to adjust the charging power of the bidirectional on-board charger or the total power of the AC electrical appliances in the vehicle based on a first threshold.

[0073] The bidirectional onboard charger is connected to the mains at one end and to the power detection module at the other. The bypass switching module is connected to the mains at one end and to the power detection module at the other. The power detection module is connected to all AC electrical appliances in the vehicle. The controller is connected to the bypass switching module and the bidirectional onboard charger.

[0074] Preferably, the controller can be integrated on a PCB board of the bypass switching module.

[0075] In one embodiment, the bypass switching module includes a phase-locked loop circuit and a static switch connected in sequence.

[0076] Preferably, the phase-locked loop (PLL) circuit is implemented by constructing a phase detector, a loop filter and a voltage-controlled oscillator through FPGA, and further, XA Artix-7 (automotive grade) is adopted.

[0077] Preferably, the static switch adopts an IGBT+SCR combination, which can ensure that the action time is ≤2ms, thereby making the total switching time no more than 10ms.

[0078] Preferably, the bypass switching module further includes a snubber circuit, ie, a parallel RC (100Ω+0.1μF) to absorb switching surges.

[0079] In one embodiment, the phase detector in a phase-locked loop (PLL) circuit uses an edge-triggered flip-flop. By comparing the rising edge phase difference between a reference signal and a feedback signal, it generates a pulse signal with a duty cycle proportional to the phase error. The loop filter uses adaptive proportional-integral (PI) control, dynamically adjusting filter parameters based on the phase error. For example, when the error is large, the proportional coefficient is increased to accelerate convergence, while when the error is small, the filter switches to integral mode to suppress steady-state jitter. The voltage-controlled oscillator is implemented using a digitally controlled oscillator within an FPGA. The output frequency is adjusted by a digital control word, supporting wide-range frequency tracking.

[0080] In addition, the phase-locked loop (PLL) circuit can achieve (1) adaptive bandwidth adjustment, that is, dynamically adjusting the PLL bandwidth according to the system load and noise level. For example, in a high-noise environment, the loop filter bandwidth is increased to improve the response speed, and in a low-noise environment, the bandwidth is reduced to reduce the phase noise. (2) Fast locking, that is, using a multi-phase capture algorithm to accelerate phase alignment through high-frequency sampling in the initial stage, shortening the locking time to the microsecond level. (3) Anti-interference mechanism, that is, dynamically adjusting the counter step size according to the phase error size to suppress high-frequency jitter.

[0081] In one embodiment, the static switch is driven by IGBT+SCR in a coordinated manner, and its trigger timing is controlled as follows:

[0082] The SCRs use a bidirectional parallel structure (e.g., a T1 / T2 combination), and the FPGA generates complementary PWM signals to control the firing angles. The positive half-cycle triggers SCR1, while the negative half-cycle triggers SCR2, ensuring seamless switching.

[0083] The IGBT is used to maintain the bypass state. The drive signal must be strictly synchronized with the SCR trigger pulse to avoid circulating current. The IGBT switching frequency is set to 2kHz, meeting the ≤2ms operation time requirement.

[0084] Furthermore, the synchronous switching conditions are:

[0085] Voltage / frequency synchronization: The phase difference (Δφ<±1°) and frequency difference (Δf<±0.5Hz) between the inverter and the mains are compared in real time through PLL, and switching is initiated when the conditions are met.

[0086] Zero Current Switching (ZCS): Triggers switching at the load current zero-crossing point, reducing arc losses. A hardware comparator detects the current zero-crossing signal, with trigger delay limited to 10μs.

[0087] The entire switching process includes five operating states: normal operation (Active), pre-switching (Pre-Switch), switching (Switchover), bypass operation (Bypass), and reset (Restore). Timing control is achieved through a state machine.

[0088] In one embodiment, the power controller for the new energy RV further includes a DC / DC module.

[0089] The DC / DC module is used to power the DC electrical appliances in the vehicle. One end of the DC / DC module is connected to the vehicle's power battery, and the other end is connected to the DC electrical appliances in the vehicle.

[0090] Preferably, the DC / DC module is 1.5kW, which can provide electricity for low-voltage electrical appliances in the RV, such as refrigerators, lighting, table and chair lifting, etc.

[0091] In one embodiment, the components in the power controller for the new energy RV are all designed with automotive-grade components. Compared with traditional consumer-grade or industrial-grade components, the system is stable and reliable.

[0092] This power controller for new energy RVs can enable seamless switching of AC high-power electricity. That is, when the new energy / extended-range RV is not connected to the mains, the household appliances in the car are powered by the inverter function of the on-board charger; when the new energy / extended-range RV is charged using a slow charging pile, the mains power enters this new energy RV power controller through the slow charging gun and slow charging socket. Part of the AC power is used to charge the battery pack through the on-board charger, and part of the AC power is directly used to power the household appliances in the car. The power supply for the household appliances is switched from the on-board charger to the grid output, and the switching time is ≤10ms, ensuring that the appliances in the car (such as kettles and rice cookers) are not disconnected during the switching process.

[0093] At the same time, through power distribution during the charging process, that is, the input power of the charging gun (output of the on-board charger) + the power of household appliances ≤ the first threshold, it ensures that the charger will not have an input overcurrent fault. At the same time, the charging power is dynamically adjusted to give priority to household appliances and meet the simultaneous operation of high-power appliances such as rice cookers, induction cookers, and water heaters.

[0094] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or modules can be electrical, mechanical or other forms.

[0095] The modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules; they may be located in one place or distributed on multiple network modules; some or all of the modules may be selected according to actual needs to achieve the purpose of this embodiment.

[0096] In addition, all functional modules in the embodiments of the present invention can be integrated into one processing module, or each module can be a separate module, or two or more modules can be integrated into one module; the above-mentioned integrated modules can be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0097] Those skilled in the art will appreciate that all or part of the steps of the above-mentioned method embodiments may be implemented by hardware associated with program instructions, and the aforementioned program may be stored in a computer-readable storage medium. When the program is executed, the program executes the steps of the above-mentioned method embodiments. The aforementioned storage medium includes various media that can store program codes, such as mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0098] Alternatively, if the above-mentioned integrated module of the present invention is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

[0099] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A charge and discharge control method, characterized in that: The method is applied to a power controller for a new energy RV, wherein the power controller includes a bidirectional on-board charger; and when the bidirectional on-board charger inverts and supplies power to AC electrical appliances in the vehicle, the method includes: In response to a vehicle charging port fully connected signal, synchronizing the phases of the bidirectional on-board charger and the mains power supply, and switching the power supply of the AC electrical appliances in the vehicle from the inverter power supply of the bidirectional on-board charger to the mains power supply after the phase synchronization; In response to the charging permission instruction, charging the vehicle power battery through the bidirectional on-board charger; The total power of the AC electrical appliances in the vehicle is obtained, and the charging power of the bidirectional on-board charger or the total power of the AC electrical appliances in the vehicle is adjusted based on a first threshold.

2. The charge and discharge control method according to claim 1, wherein: Adjusting the charging power of the bidirectional on-board charger or the total power of the AC electrical appliances in the vehicle based on the first threshold includes: Determine P_charge according to P_charge=P-P_house, where P is the first threshold, and the first threshold is the maximum charging power of the bidirectional on-board charger, P_charge is the adjusted charging power of the bidirectional on-board charger, and P_house is the total power of the AC electrical appliances in the vehicle; If P_house is greater than P, adjust P_charge to 0 and trigger an overload alarm; Otherwise, continue charging according to the current P_charge.

3. The charge and discharge control method according to claim 2, wherein: In response to the overload alarm, a list of AC electrical appliances in the vehicle is displayed on a display screen, and a disconnection option is provided; If any of the in-vehicle AC electrical appliances is disconnected from power supply, then return to confirm P_charge; Otherwise, the bidirectional on-board charger is controlled to enter a standby mode.

4. The charge and discharge control method according to claim 2, wherein: In response to the stop charging instruction, the bidirectional on-board charger is controlled to enter a sleep mode.

5. The charge and discharge control method according to claim 1, wherein: The power controller for the new energy RV also includes a DC / DC module connected in parallel with the bidirectional on-board charger, and the DC / DC module is connected to the vehicle power battery, and further includes: The DC / DC module is used to supply power to the DC electrical appliances in the vehicle.

6. A power controller for new energy RV, used to connect with the vehicle power battery and the vehicle controller, characterized in that: include: Bidirectional on-board charger, used to convert mains electricity into high-voltage direct current (HVDC), or convert HVDC into 220V AC; a bypass switching module, configured to synchronize the bidirectional onboard charger and the mains phase in response to a vehicle charging port fully connected signal; Power detection module, used to obtain the total power of AC electrical appliances in the car; a controller configured to switch the power supply of the in-vehicle AC electrical appliances from the inverter power supply of the bidirectional on-board charger to the mains power supply after phase synchronization, and to adjust the charging power of the bidirectional on-board charger or the total power of the in-vehicle AC electrical appliances based on a first threshold; and One end of the bidirectional on-board charger is used to be connected to the mains, and the other end is connected to the power detection module; One end of the bypass switching module is used to be connected to the mains, and the other end is connected to the power detection module; The power detection module is connected to all AC electrical appliances in the vehicle; The controller is connected to the bypass switching module and the bidirectional on-board charger.

7. The power controller for new energy RV according to claim 6, characterized in that: The bypass switching module includes a phase-locked loop circuit and a static switch connected in sequence.

8. The power controller for new energy RV according to claim 6, characterized in that: Also includes: DC / DC module, used to power DC electrical appliances in the vehicle; and, One end of the DC / DC module is connected to the power battery in the vehicle, and the other end is connected to the DC electrical appliance in the vehicle.

Images