MPPT control system, control method and cold chain vehicle for cold chain vehicle

Abstract

The present invention belongs to the field of power generation technology, and relates to an MPPT control system, a control method and a cold chain vehicle for a cold chain vehicle, wherein the MPPT control system for a cold chain vehicle comprises: a control module configured to control a photovoltaic power generation device to charge a power battery, and to control a generator mechanism to charge the power battery at the same time when the power of the power battery is less than a preset power; wherein the photovoltaic power generation device comprises: a plurality of photovoltaic power generation panels, and a power module corresponding to and electrically connected to the photovoltaic power generation panels; a MOS tube is provided in the power module; the control module is configured to obtain real-time disturbance time according to the parameters of the photovoltaic power generation panel and the parameters of the MOS tube, and to regulate the voltage and current output by the photovoltaic power generation panel according to the real-time disturbance time, thereby realizing the acquisition of real-time disturbance time according to the parameters of the MOS tube, so that the MOS tube can complete a complete workflow, and avoid the abnormal current caused by the inability to complete the complete workflow affecting the MOS tube.

Description

Technical Field

[0001] The present invention belongs to the field of power generation technology, specifically to a power supply system, and more particularly to an MPPT control system, a control method, and a cold chain vehicle for a cold chain vehicle. Background Art

[0002] The cold chain vehicle is equipped with a photovoltaic power generation device and a generator mechanism to meet the cooling and refrigeration needs of the cold chain vehicle. MPPT (MPPT stands for "Maximum Power Point Tracking") needs to be dynamically adjusted with the light, but when the dynamic adjustment speed is too fast, the power module cannot keep up with the response, especially the MOS tube inside the power supply, that is, the MOS tube responsible for the step-up and step-down part of the power module. The time required for the MOS tube to fully turn on from receiving the start signal, and the time required for the MOS tube to fully turn off from receiving the shutdown signal. The disturbance is too fast and the MOS tube cannot complete a complete work process and is passively cut off. At this time, there will be a certain abnormal current when the MOS tube works again. As time accumulates, the aging of the MOS tube will be accelerated, resulting in a decrease in the working efficiency of the power module. As a result, although the MPPT is at the optimal efficiency point MPP, the overall working efficiency is reduced.

[0003] Therefore, due to the technical problem that the MOS tube cannot complete a complete workflow due to excessive disturbance, which accelerates the aging of the MOS tube, it is necessary to design an MPPT control system, control method and cold chain vehicle for cold chain vehicles.

[0004] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the Invention

[0005] The embodiments of the present disclosure provide at least one MPPT control system, a control method, and a cold chain vehicle for a cold chain vehicle.

[0006] In a first aspect, an embodiment of the present disclosure provides an MPPT control system for a cold chain vehicle, comprising:

[0007] A control module, and a photovoltaic power generation device and a generator mechanism electrically connected to the control module;

[0008] The photovoltaic power generation device and the generator mechanism are connected to the power battery, and the control module is configured to control the photovoltaic power generation device to charge the power battery, and to control the generator mechanism to charge the power battery at the same time when the power battery power is less than a preset power;

[0009] The photovoltaic power generation device includes: a plurality of photovoltaic power generation panels, and a power supply module corresponding to and electrically connected to the photovoltaic power generation panels;

[0010] The power module and the photovoltaic panel are electrically connected to the control module;

[0011] The power module is provided with a MOS tube;

[0012] The control module is configured to obtain the real-time disturbance time according to the parameters of the photovoltaic power generation panel and the parameters of the MOS tube in real time, and regulate the voltage and current output by the photovoltaic power generation panel according to the real-time disturbance time.

[0013] In an optional embodiment, the control module is configured to obtain the real-time disturbance time in real time according to the parameters of the photovoltaic panel and the parameters of the MOS tube, and the method includes:

[0014] The parameters of the photovoltaic panel include: output voltage;

[0015] The parameters of the MOS tube include: on-resistance;

[0016] The control module first obtains the efficiency decay:

[0017] ;

[0018] Where n is the efficiency attenuation; R DS(on) is the on-resistance; I is the output current of the power module; V in is the output voltage of the photovoltaic panel, that is, the input voltage of the power module;

[0019] The control module then obtains the real-time disturbance time:

[0020] ;

[0021] Where T is the real-time disturbance time; T 出厂 This is the working time of the MOS tube in the power module when it leaves the factory.

[0022] In an optional embodiment, the method for regulating the voltage and current output by the photovoltaic panel according to the real-time disturbance time includes:

[0023] The control module is configured to obtain an initial step size, then obtain a disturbance strategy according to a load state, and regulate the voltage and current output by the photovoltaic panel according to the disturbance strategy;

[0024] The power battery is connected to a load, and the load status is obtained through the control module;

[0025] The load state includes: light load state, steady state and heavy load state;

[0026] The light load state is when the proportion of the load real-time power to the maximum power is less than or equal to a first preset proportion;

[0027] The steady state is when the real-time power of the load occupies a proportion of the maximum power that is greater than a first preset proportion and less than or equal to a second preset proportion;

[0028] The proportion of the real-time power of the load in the heavy-load state to the maximum power is greater than the second preset proportion.

[0029] In an optional embodiment, the step size is the value of one increase or decrease of the voltage or current within the disturbance time;

[0030] The disturbance strategy includes: the change amount of the load state corresponding to the step size, and the efficiency of the power module.

[0031] In an optional embodiment, when the load is in a light load state, the control module is configured to double the current in the initial step, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to a first preset efficiency, and stop the disturbance after the efficiency of the power module reaches the first preset efficiency.

[0032] In an optional embodiment, when the load is in a steady state, the control module is configured to keep the initial step size unchanged, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to a second preset efficiency, and stop the disturbance after the efficiency of the power module reaches the second preset efficiency.

[0033] In an optional embodiment, when the load is in a heavy load state, the control module is configured to reduce the initial step size by half, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to the maximum preset efficiency, and stop the disturbance after the efficiency of the power module reaches the maximum preset efficiency.

[0034] In a second aspect, the present disclosure also provides a method for obtaining real-time disturbance time using the above-mentioned MPPT control system for cold chain vehicles, comprising:

[0035] The method for obtaining the real-time disturbance time in real time according to the parameters of the photovoltaic panel and the parameters of the MOS tube by the control module includes:

[0036] The parameters of the photovoltaic panel include: output voltage;

[0037] The parameters of the MOS tube include: on-resistance;

[0038] The control module first obtains the efficiency decay:

[0039] ;

[0040] Where n is the efficiency attenuation; RDS(on) is the on-resistance; I is the output current of the power module; V in is the output voltage of the photovoltaic panel, that is, the input voltage of the power module;

[0041] The control module then obtains the real-time disturbance time:

[0042] ;

[0043] Where T is the real-time disturbance time; T 出厂 This is the working time of the MOS tube in the power module when it leaves the factory.

[0044] In a third aspect, the present disclosure also provides a control method using the above-mentioned MPPT control system for cold chain vehicles, including:

[0045] The control module obtains the real-time disturbance time according to the parameters of the photovoltaic panel and the parameters of the MOS tube in real time, and adjusts the voltage and current output by the photovoltaic panel according to the real-time disturbance time.

[0046] In an optional embodiment, the control module controls the photovoltaic power generation device to charge the power battery, and controls the generator mechanism to charge the power battery simultaneously when the power of the power battery is less than a preset power.

[0047] In a fourth aspect, the disclosed embodiment also provides a cold chain vehicle, which adopts the above-mentioned MPPT control system for cold chain vehicles. The beneficial effect of the present invention is that the MPPT control system for cold chain vehicles comprises: a control module, and a photovoltaic power generation device and a generator mechanism electrically connected to the control module; the photovoltaic power generation device and the generator mechanism are connected to a power battery, and the control module is configured to control the photovoltaic power generation device to charge the power battery, and when the power of the power battery is less than a preset power, the generator mechanism is controlled to charge the power battery at the same time; wherein the photovoltaic power generation device comprises: a plurality of photovoltaic power generation panels, and a power module corresponding to and electrically connected to the photovoltaic power generation panels; the power module and the photovoltaic power generation panels are electrically connected to the control module; a MOS tube is provided in the power module; the control module is configured to obtain the real-time disturbance time in real time according to the parameters of the photovoltaic power generation panel and the parameters of the MOS tube, and regulate the voltage and current output by the photovoltaic power generation panel according to the real-time disturbance time, thereby realizing the acquisition of the real-time disturbance time according to the parameters of the MOS tube, so that the MOS tube can complete a complete workflow, and avoid the abnormal current formed by the inability to complete the complete workflow affecting the MOS tube.

[0048] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 A block diagram of the MPPT control system for cold chain vehicles provided in an embodiment of the present disclosure;

[0052] Figure 2 A circuit diagram of an MPPT control system for cold chain vehicles provided in an embodiment of the present disclosure;

[0053] Figure 3 This is a schematic diagram comparing the photovoltaic MPPT and power efficiency curves. DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0055] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0056] The optimal MPPT point isn't necessarily the optimal power supply efficiency point. However, the power supply is the final output and needs to drive other loads, so its efficiency must be maintained. Prolonged operation at the maximum power point (MPP) can shorten the lifespan of photovoltaic panels. This operation, nearing the electrical stress limit, can accelerate the aging of semiconductor materials (silicon wafers, doping layers) and packaging materials (EVA film, backsheet), leading to increased defects within the wafer, increased carrier recombination rates, and decreased efficiency. The packaging material can also crack and yellow, affecting light transmittance and mechanical strength. The MPPT needs to dynamically adjust according to light intensity, but if the dynamic adjustment speed is too fast, the power module cannot keep up. This is especially true for the MOSFETs within the power supply. The time it takes for a MOSFET to fully turn on after receiving a turn-on signal, and the time it takes to fully turn off after receiving a turn-off signal, can be too fast to allow the MOSFETs to complete a complete process and be forced to shut down. When the MOSFETs resume operation, they will draw a certain amount of abnormal current. Over time, this accelerates aging, reducing the efficiency of the power module. Consequently, even though the MPPT is at the optimal efficiency point (MPP), overall efficiency is reduced.

[0057] The defects in the above solutions are the results obtained by the inventors after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present disclosure in this article should be the contributions made by the inventors to the present disclosure during the disclosure process.

[0058] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0059] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0060] like Figure 1As shown, at least one disclosed embodiment provides an MPPT control system for cold chain vehicles, comprising: a control module, and a photovoltaic power generation device and a generator mechanism electrically connected to the control module; the photovoltaic power generation device and the generator mechanism are connected to a power battery, and the control module is configured to control the photovoltaic power generation device to charge the power battery, and to control the generator mechanism to charge the power battery at the same time when the power of the power battery is less than a preset power; wherein the photovoltaic power generation device comprises: a plurality of photovoltaic power generation panels, and a power module corresponding to and electrically connected to the photovoltaic power generation panels; the power module and the photovoltaic power generation panels are electrically connected to the control module; a MOS tube is provided in the power module; the control module is configured to obtain real-time disturbance time according to the parameters of the photovoltaic power generation panel and the parameters of the MOS tube, and to regulate the voltage and current output by the photovoltaic power generation panel according to the real-time disturbance time, thereby realizing the acquisition of real-time disturbance time according to the parameters of the MOS tube, so that the MOS tube can complete a complete workflow, and avoid the abnormal current caused by the inability to complete the complete workflow affecting the MOS tube.

[0061] like Figure 3 As shown, in this embodiment, the photovoltaic power generation panel adopts medium-to-high efficiency photovoltaic power generation panels to meet the efficiency requirements of the power module. The service life is long and meets the use requirements of the cold chain vehicle. The life of the photovoltaic power generation panel is inversely proportional to its power generation efficiency. When high-efficiency power generation is performed, its service life will be greatly reduced. Therefore, in this embodiment, the power generation efficiency is adjusted to meet the corresponding efficiency of the power module. When the power module is at maximum efficiency, the power generation efficiency of the photovoltaic power generation panel is not at maximum efficiency. Continuously improving the power generation efficiency of the photovoltaic power generation panel, the efficiency of the power module will not increase, and the output will not increase, resulting in only the service life of the photovoltaic power generation panel being affected. Therefore, a lower efficiency photovoltaic power generation panel can be used to both meet the output of the power module and extend the service life of the photovoltaic power generation panel.

[0062] In an optional embodiment, the control module is configured to obtain the real-time disturbance time in real time based on the parameters of the photovoltaic panel and the parameters of the MOS tube. The method includes: the parameters of the photovoltaic panel include: output voltage; the parameters of the MOS tube include: on-resistance; the control module first obtains the efficiency attenuation:

[0063] ;

[0064] Where n is the efficiency attenuation; R DS(on) is the on-resistance, which adopts a preset fixed value that can be obtained from the technical manual; I is the output current of the power module; V in is the output voltage of the photovoltaic panel, that is, the input voltage of the power module;

[0065] The control module then obtains the real-time disturbance time:

[0066] ;

[0067] Where T is the real-time disturbance time; T 出厂 It is the working time of the MOS tube in the power module when it leaves the factory, that is, the sum of the time required for the corresponding MOS tube to be fully turned on after receiving the turn-on signal and the time required for the corresponding MOS tube to be fully turned off after receiving the turn-off signal.

[0068] In this embodiment, the real-time disturbance time is obtained according to the parameters of the MOS tube, which can ensure that the MOS tube can complete a complete workflow in one disturbance, thereby avoiding the abnormal current caused by the inability to complete the complete workflow from affecting the MOS tube.

[0069] In this embodiment, the method for regulating the voltage and current output by the photovoltaic panel may be to set a voltage regulating module and a current limiting module at the input end of the power module to regulate the voltage and current output from the photovoltaic panel to the power module.

[0070] In an optional embodiment, the method for regulating the voltage and current output by the photovoltaic panel according to the real-time disturbance time includes: the control module is configured to obtain an initial step size, and then obtain a disturbance strategy according to the load state, and regulate the voltage and current output by the photovoltaic panel according to the disturbance strategy; the power battery is connected to the load, and the load state is obtained through the control module; the load state includes: light load state, steady state and heavy load state; the light load state is that the real-time power of the load occupies a maximum power ratio less than or equal to a first preset ratio; the steady state is that the real-time power of the load occupies a maximum power ratio greater than the first preset ratio and less than or equal to the second preset ratio; the heavy load state is that the real-time power of the load occupies a maximum power ratio greater than the second preset ratio.

[0071] In this embodiment, the first preset ratio can be 30%, and the second preset ratio can be 70%. That is, when the ratio of the real-time power of the load to the maximum power is less than or equal to 30, the load is judged to be in a light load state; when it is greater than 30% and less than or equal to 70%, the load is judged to be in a steady state; when it is greater than 70% and less than or equal to 100%, the load is judged to be in a heavy load state.

[0072] In an optional embodiment, the step size is the value of one increase or decrease of the voltage or current within the disturbance time; the disturbance strategy includes: the change amount of the load state corresponding to the step size, and the efficiency of the power module.

[0073] In this embodiment, the current and voltage may each have a corresponding initial step size.

[0074] In an optional embodiment, when the load is in a light load state, the control module is configured to double the current in the initial step, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to a first preset efficiency, and stop the disturbance after the efficiency of the power module reaches the first preset efficiency.

[0075] In this embodiment, the first preset efficiency of the power module may be 50%. Power efficiency refers to the efficiency ratio of a power device when converting input electrical energy into output electrical energy, typically expressed as a percentage. A high power efficiency indicates that the device has less energy loss during energy conversion and can use electrical energy more efficiently.

[0076] In this embodiment, under light load conditions, the initial step size corresponding to the current is doubled, and then disturbance is performed according to the real-time disturbance time, i.e., MPPT is performed, and during the disturbance process, the current is first adjusted, and the input voltage and input current of the power module, i.e., the output voltage and output current of the photovoltaic panel, are continuously adjusted until the efficiency of the power module is adjusted to the first preset efficiency.

[0077] In an optional embodiment, when the load is in a steady state, the control module is configured to keep the initial step size unchanged, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to a second preset efficiency, and stop the disturbance after the efficiency of the power module reaches the second preset efficiency.

[0078] In this embodiment, the second preset efficiency of the power module may be 80%.

[0079] In this embodiment, in a steady state, the initial step size of the voltage and current is maintained, and then disturbances are performed according to the real-time disturbance time, and the input voltage and input current of the power module, that is, the output voltage and output current of the photovoltaic panel, are continuously adjusted until the efficiency of the power module is adjusted to the second preset efficiency.

[0080] In an optional embodiment, when the load is in a heavy load state, the control module is configured to reduce the initial step size by half, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to the maximum preset efficiency, and stop the disturbance after the efficiency of the power module reaches the maximum preset efficiency.

[0081] In this embodiment, under heavy load conditions, the initial step sizes of current and voltage are reduced to half of their original values, and then disturbances are performed according to the real-time disturbance time, i.e., MPPT is performed, and the input voltage and input current of the power module, i.e., the output voltage and output current of the photovoltaic panel, are continuously adjusted until the efficiency of the power module is adjusted to the maximum preset efficiency.

[0082] like Figure 2 As shown, in this embodiment, the main circuit sequence from the photovoltaic panel to the power battery is: photovoltaic input 1, inverter 1, voltage transformation / isolation, full-bridge rectifier 1, backflow prevention, and power battery. Four independent photovoltaic inputs can be provided, each capable of independent operation without interfering with each other. After the photovoltaic input and full-bridge rectification, voltage is collected and used as input for the control module (MCU). The control module outputs control signals to control the full-bridge rectifier, controlling whether the photovoltaic panel is enabled, controlling MPPT maximum power point tracking, and controlling the voltage and current output to the battery. As the battery voltage increases, the output voltage increases accordingly, achieving constant voltage and constant current charging. If the battery is fully charged, the output is immediately cut off, stopping battery charging. During photovoltaic charging, the control module collects the power battery CAN signal in real time to determine whether the power battery is allowed to charge and respond promptly. In this embodiment, the main circuit sequence from the range extender (generator mechanism) to the power battery is: three-phase AC generator input, rectifier 5, inverter 5, voltage transformation / isolation 5, full-bridge rectifier 5, and power battery. The control module collects the three-phase AC input, the output of the rectifier 5, and the output of the full-bridge rectifier 5 as inputs. The control module then outputs control signals to control the rectifier 5, inverter 5, and full-bridge rectifier 5. When the range extender starts, energy first flows from the power battery to the three-phase AC to start the generator. After successful startup, energy flows from the three-phase AC to the power battery to charge the power battery. The control module also controls the air damper (servo M1) and the throttle (servo M2). These two servos are turned on when starting is required and turned off after the generator stops. The control module also connects to the flameout control line. When the generator needs to be shut down, the control module controls the flameout control line to ground, shorting the generator high-voltage transformer to ground and stopping the generator ignition, thus shutting down the generator. Once the generator has completely shut down, the flameout control line to ground is internally disconnected.

[0083] In this embodiment, a light sensor can be installed at the photovoltaic panel to detect light intensity. During photovoltaic power generation, the control module can monitor and obtain the power battery status in real time. If the SOC is greater than 95% or there is no light (insufficient light), the photovoltaic power generation will enter the shutdown mode and provide feedback on the photovoltaic operation status.

[0084] In this embodiment, regardless of whether the photovoltaic system is working, when the SOC is less than 20%, the control module controls the range extender to automatically start, and when the SOC is greater than 80%, the range extender automatically stops.

[0085] At least one other disclosed embodiment further provides a method for obtaining real-time disturbance time using the above-mentioned MPPT control system for cold chain vehicles, including: a method for obtaining real-time disturbance time in real time according to the parameters of the photovoltaic panel and the parameters of the MOS tube by a control module, including: the parameters of the photovoltaic panel include: output voltage; the parameters of the MOS tube include: on-resistance; the control module first obtains efficiency attenuation:

[0086] ;

[0087] Where n is the efficiency attenuation; R DS(on) is the on-resistance; I is the output current of the power module; V in is the output voltage of the photovoltaic panel, that is, the input voltage of the power module;

[0088] The control module then obtains the real-time disturbance time:

[0089] ;

[0090] Where T is the real-time disturbance time; T 出厂 This is the working time of the MOS tube in the power module when it leaves the factory.

[0091] At least one other disclosed embodiment further provides a control method using the above-mentioned MPPT control system for cold chain vehicles, including:

[0092] The control module obtains the real-time disturbance time according to the parameters of the photovoltaic panel and the parameters of the MOS tube in real time, and adjusts the voltage and current output by the photovoltaic panel according to the real-time disturbance time.

[0093] In an optional embodiment, the control module controls the photovoltaic power generation device to charge the power battery, and controls the generator mechanism to charge the power battery simultaneously when the power of the power battery is less than a preset power.

[0094] At least one other disclosed embodiment also provides a cold chain vehicle that adopts the above-mentioned MPPT control system for cold chain vehicles.

[0095] To sum up, the MPPT control system for cold chain vehicles includes: a control module, and a photovoltaic power generation device and a generator mechanism electrically connected to the control module; the photovoltaic power generation device and the generator mechanism are connected to the power battery, and the control module is configured to control the photovoltaic power generation device to charge the power battery, and to control the generator mechanism to charge the power battery at the same time when the power of the power battery is less than the preset power; wherein the photovoltaic power generation device includes: a number of photovoltaic power generation panels, and a power module corresponding to and electrically connected to the photovoltaic power generation panels; the power module and the photovoltaic power generation panels are electrically connected to the control module; a MOS tube is provided in the power module; the control module is configured to obtain the real-time disturbance time in real time according to the parameters of the photovoltaic power generation panel and the parameters of the MOS tube, and regulate the voltage and current output by the photovoltaic power generation panel according to the real-time disturbance time, thereby realizing the acquisition of the real-time disturbance time according to the parameters of the MOS tube, so that the MOS tube can complete a complete workflow, avoiding the abnormal current caused by the inability to complete the complete workflow affecting the MOS tube.

[0096] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0097] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0098] Spatially relative terms, such as "inside," "outside," "below," "beneath," "below," "above," "upper," etc., may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures were turned over, elements described as "below" or "beneath" other elements or features would be oriented "above" the other elements or features. Thus, the example term "below" can encompass both above and below orientations.

[0099] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A MPPT control system for cold chain vehicles, characterized in that: include: A control module, and a photovoltaic power generation device and a generator mechanism electrically connected to the control module; The photovoltaic power generation device and the generator mechanism are both electrically connected to the power battery, and the control module is configured to control the photovoltaic power generation device to charge the power battery, and to control the generator mechanism to charge the power battery at the same time when the power battery power is less than a preset power; The photovoltaic power generation device includes: a plurality of photovoltaic power generation panels, and a power supply module corresponding to and electrically connected to the photovoltaic power generation panels; The power module and the photovoltaic power generation panel are both electrically connected to the control module; The power module is provided with a MOS tube; The control module is configured to obtain the real-time disturbance time in real time according to the parameters of the photovoltaic power generation panel and the parameters of the MOS tube, and regulate the voltage and current output by the photovoltaic power generation panel according to the real-time disturbance time; The control module is configured to obtain the real-time disturbance time in real time according to the parameters of the photovoltaic panel and the parameters of the MOS tube, including: The parameters of the photovoltaic panel include: output voltage; The parameters of the MOS tube include: on-resistance; The control module first obtains the efficiency decay: ； Where n is the efficiency attenuation; R DS(on) is the on-resistance; I is the output current of the power module; V in is the output voltage of the photovoltaic panel, that is, the input voltage of the power module; The control module then obtains the real-time disturbance time: ； Where T is the real-time disturbance time; T 出厂 This is the working time of the MOS tube in the power module when it leaves the factory.

2. The MPPT control system for cold chain vehicles according to claim 1, characterized in that: The method for regulating the voltage and current output by the photovoltaic panel according to the real-time disturbance time includes: The control module is configured to obtain an initial step size, then obtain a disturbance strategy according to a load state, and regulate the voltage and current output by the photovoltaic panel according to the disturbance strategy; The power battery is connected to a load, and the load status is obtained through the control module; The load state includes: light load state, steady state and heavy load state; The light load state is when the proportion of the load real-time power to the maximum power is less than or equal to a first preset proportion; The steady state is when the load real-time power accounts for a proportion of the maximum power that is greater than a first preset proportion and less than or equal to a second preset proportion; The proportion of the real-time power of the load in the heavy-load state to the maximum power is greater than the second preset proportion.

3. The MPPT control system for cold chain vehicles according to claim 2, characterized in that: The step size is the value of one increase or decrease of the voltage or current within the disturbance time; The disturbance strategy includes: the change amount of the load state corresponding to the step size, and the efficiency of the power module.

4. The MPPT control system for cold chain vehicles according to claim 3, characterized in that: When the load is in a light load state, the control module is configured to double the current in the initial step size, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to a first preset efficiency, and stop the disturbance after the efficiency of the power module reaches the first preset efficiency.

5. The MPPT control system for cold chain vehicles according to claim 3, characterized in that: When the load is in a steady state, the control module is configured to keep the initial step size unchanged, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to a second preset efficiency, and stop the disturbance after the efficiency of the power module reaches the second preset efficiency.

6. The MPPT control system for cold chain vehicles according to claim 3, characterized in that: When the load is in a heavy load state, the control module is configured to reduce the initial step size by half, and then perform disturbances at a real-time disturbance time to regulate the voltage and current output by the photovoltaic panel so that the efficiency of the power module is adjusted to the maximum preset efficiency, and stop the disturbance after the efficiency of the power module reaches the maximum preset efficiency.

7. A method for obtaining real-time disturbance time using the MPPT control system for cold chain vehicles according to claim 1, characterized in that: include: The method for obtaining the real-time disturbance time in real time according to the parameters of the photovoltaic panel and the parameters of the MOS tube by the control module includes: The parameters of the photovoltaic panel include: output voltage; The parameters of the MOS tube include: on-resistance; The control module first obtains the efficiency decay: ； Where n is the efficiency attenuation; R DS(on) is the on-resistance; I is the output current of the power module; V in is the output voltage of the photovoltaic panel, that is, the input voltage of the power module; The control module then obtains the real-time disturbance time: ； Where T is the real-time disturbance time; T 出厂 This is the working time of the MOS tube in the power module when it leaves the factory.

8. A control method using the MPPT control system for cold chain vehicles according to claim 1, characterized in that: include: The control module obtains the real-time disturbance time according to the parameters of the photovoltaic panel and the parameters of the MOS tube in real time, and adjusts the voltage and current output by the photovoltaic panel according to the real-time disturbance time; The control module controls the photovoltaic power generation device to charge the power battery, and controls the generator mechanism to charge the power battery at the same time when the power battery power is less than the preset power.

9. A cold chain vehicle, characterized in that: The MPPT control system for cold chain vehicles as described in claim 1 is adopted.

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