CN116238379B

CN116238379B - Charging adjustment method and device

Info

Publication number: CN116238379B
Application number: CN202310309117.7A
Authority: CN
Inventors: 敖翔
Original assignee: Avatr Technology Chongqing Co Ltd
Current assignee: Avatr Technology Chongqing Co Ltd
Priority date: 2023-03-27
Filing date: 2023-03-27
Publication date: 2023-09-26
Anticipated expiration: 2043-03-27
Also published as: CN116238379A

Abstract

The application provides a charging adjustment method and a charging adjustment device, wherein the method comprises the steps of obtaining current information of a charging port of powered equipment; determining an oscillation change parameter of the power receiving apparatus based on the current information; adjusting an expected current value of the power receiving device based on the current information to obtain an adjusted expected current value when the oscillation variation parameter is within a first preset range; taking the adjusted expected current value as a first target value, and carrying out charging adjustment on the power receiving equipment based on the current information so as to enable the oscillation change parameter to be in a second preset range; and under the condition that the oscillation change parameter is within the second preset range, taking the expected voltage value of the power receiving equipment as a second target value, and carrying out charging adjustment on the power receiving equipment.

Description

Charging adjustment method and device

Technical Field

The application relates to the field of motor control, in particular to a charging adjustment method and device.

Background

New energy electric vehicles are becoming more popular, the market occupation rate is becoming higher, and charging anxiety is a consequent industry problem. For charging anxiety, one solution is to continuously increase charging power so as to shorten charging time and reduce anxiety of vehicle owners; the two directions of boosting the charging power are boosting the charging current and boosting the charging voltage. Because the standardization of the charging port leads to the charging current not being able to be infinitely increased, the development trend of the high-voltage platform such as 800V is prominent, so as to increase the charging voltage to increase the charging power and shorten the charging time. However, as the passenger car is mainly below 450V in the early development of the market, the corresponding direct current power supply equipment is mainly below 500V, the development has an actual distribution proportion which cannot be ignored so far, and the problem of voltage discomfort is caused for charging the car with the 800V high-voltage platform. For this voltage-non-adaptation problem, the related art employs a motor as an inductor and a controller (Motor Control Unit, MCU) as a controller to perform boost charging, but the vehicle cannot be stably charged due to an inductance-capacitance (LC) oscillation problem during the boost charging.

Disclosure of Invention

The application mainly provides a charging adjustment method and a charging adjustment device, which can smoothly adjust the current total voltage and the current charging port voltage of powered equipment so as to reduce LC oscillation and realize stable boosting charging of the powered equipment.

The technical scheme of the embodiment of the application is realized as follows:

the embodiment of the application provides a charging adjustment method, which comprises the following steps:

acquiring current information of a charging port of the powered device;

determining an oscillation change parameter of the power receiving apparatus based on the current information;

adjusting an expected current value of the power receiving device based on the current information to obtain an adjusted expected current value when the oscillation variation parameter is within a first preset range;

taking the adjusted expected current value as a first target value, and carrying out charging adjustment on the power receiving equipment based on the current information so as to enable the oscillation change parameter to be in a second preset range;

and under the condition that the oscillation change parameter is within the second preset range, taking the expected voltage value of the power receiving equipment as a second target value, and carrying out charging adjustment on the power receiving equipment.

An embodiment of the present application provides a charge adjusting device, including:

The current information acquisition module is used for acquiring current information of a charging port of the powered device;

an oscillation change parameter determination module configured to determine an oscillation change parameter of the power receiving apparatus based on the current information;

the current value adjusting module is used for adjusting the expected current value of the power receiving equipment based on the current information to obtain an adjusted expected current value under the condition that the oscillation change parameter is within a first preset range;

the current loop adjusting module is used for taking the adjusted expected current value as a first target value, and carrying out charging adjustment on the power receiving equipment based on the current information so as to enable the oscillation change parameter to be in a second preset range;

and the voltage loop adjusting module is used for adjusting the charging of the power receiving equipment by taking the expected voltage value of the power receiving equipment as a second target value under the condition that the oscillation change parameter is within the second preset range.

The embodiment of the application has the following beneficial effects:

the embodiment of the application acquires current information of a charging port of the powered device; determining oscillation change parameters of the power receiving equipment through the current information; adjusting an expected current value of the powered device based on the current information to obtain an adjusted expected current value when the oscillation variation parameter is within a first preset range; in this way, by analyzing whether the oscillation change parameter is within the first preset range, the desired current value of the power receiving apparatus can be dynamically adjusted. Then, taking the adjusted expected current value as a first target value, and carrying out charging adjustment on the power receiving equipment based on the current information so as to enable the oscillation change parameter to be in a second preset range; in this way, by dynamically adjusting the adjusted desired current value to the first target value, the boosted charging of the power receiving apparatus can be achieved by the current loop adjustment mode. Under the condition that the oscillation change parameter is within a second preset range, taking the expected voltage value of the power receiving equipment as a second target value, and carrying out charging adjustment on the power receiving equipment; in this way, if the oscillation variation parameter is within the second preset range, the power receiving apparatus is boosted and charged with the desired voltage value as the second target value. Therefore, the target value is dynamically adjusted according to the preset range of the oscillation change parameter, so that the quick boost charging of the power receiving equipment can be realized, and the power receiving equipment can be protected from being damaged.

Drawings

Fig. 1 is a schematic diagram of an implementation flow of a charge adjustment method according to an embodiment of the present application;

FIG. 2A is a schematic flow chart of another implementation of a charge adjustment method according to an embodiment of the present application;

FIG. 2B is a flowchart illustrating another implementation of a charge adjustment method according to an embodiment of the present application;

FIG. 2C is a flowchart illustrating a charge adjustment method according to an embodiment of the present application;

fig. 3 is a schematic circuit topology diagram of boost charging using a charge adjustment method according to an embodiment of the present application;

fig. 4 is a schematic diagram of another vehicle topology for boost charging using a charge adjustment method according to an embodiment of the present application;

fig. 5 is a schematic diagram of an implementation framework of a charge adjustment method according to an embodiment of the present application;

FIG. 6 is a schematic flow chart of another implementation of a charge adjustment method according to an embodiment of the present application;

FIG. 7 is a schematic flow chart of another implementation of a charge adjustment method according to an embodiment of the present application;

FIG. 8 is a flowchart illustrating a charge adjustment method according to an embodiment of the present application;

FIG. 9 is a schematic flow chart of another implementation of a charge adjustment method according to an embodiment of the present application;

FIG. 10 is a flowchart illustrating another implementation of a charge adjustment method according to an embodiment of the present application;

FIG. 11 is a schematic diagram of another implementation framework of a charge adjustment method according to an embodiment of the present application;

Fig. 12 is a schematic diagram of a composition structure of a charge adjusting device 1200 according to an embodiment of the present application;

fig. 13 is a schematic diagram of a composition structure of a charge adjusting apparatus 1300 according to an embodiment of the present application.

Detailed Description

The technical scheme of the application is further elaborated below with reference to the drawings and specific embodiments.

In order that those skilled in the art will better understand the embodiments of the present disclosure, a technical solution in the embodiments of the present disclosure will be clearly described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments.

The terms first, second, third and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion, such as a series of steps or elements. The method, system, article, or apparatus is not necessarily limited to those explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.

The embodiment of the application provides a charging adjustment method, which can be applied to an MCU in a new energy vehicle, and the MCU executes the charging adjustment method in the embodiment of the application.

Fig. 1 is a schematic flow chart of an implementation of a charge adjustment method according to an embodiment of the present application, as shown in fig. 1, and the following description is made with reference to the steps shown in fig. 1:

step S101, current information of a charging port of a power receiving apparatus is acquired.

Here, the power receiving apparatus refers to a new energy vehicle to be charged, and the power receiving apparatus may also be a battery pack in the new energy vehicle to be charged, and the voltage of the battery pack may be higher than the maximum output voltage of the power supply apparatus (such as a charging pile). The current information of the powered device at the charging port may include a current value detected by the powered device at the charging port in a current period and a historical current control value stored in a previous period. The current period of the powered device may refer to a one-time cycle process in which the powered device is ready to start charging. The historical current control value is used for controlling the current value to gradually approach the target value; the historical current control value gradually increases the current value so that the current value slowly and smoothly approaches the target value. For example, the target value is 100, the present current value is 15, and then the history control current value may be an intermediate value that gradually increases from 15 to 100.

Step S102 of determining an oscillation change parameter of the power receiving apparatus based on the current information.

Here, by analyzing the current information, a current change coefficient of the current period with respect to the previous period is analyzed; and then, the current change coefficient is used for representing the range of the oscillation change parameter, namely, whether the oscillation change parameter is within a first preset range or not is determined.

In some possible implementations, the oscillation change parameter is used to characterize a change in the oscillation amplitude of the powered device. For example, the oscillation change parameter may be an oscillation amplitude change value or an oscillation slope. In this way, a change value of the oscillation amplitude of the power receiving apparatus can be obtained by determining the oscillation change parameter, thereby determining whether or not strong oscillation occurs in the power receiving apparatus.

In some possible implementations, the oscillation change parameter of the current of the powered device is analyzed by the current value of the powered device in the current information and the historical current control value stored in the previous period to determine a preset range in which the oscillation change parameter is located. For example, by monitoring a change value of an oscillation amplitude of a current of the power receiving apparatus, it is determined whether the oscillation amplitude belongs to strong oscillation in accordance with a range in which the change value of the oscillation amplitude exists.

Step S103, when the oscillation variation parameter is within a first preset range, adjusting an expected current value of the power receiving device based on the current information, to obtain an adjusted expected current value.

Here, if the oscillation change parameter is within the first preset range, it is indicated that the power receiving apparatus has strong oscillation at the present time. And then, dynamically adjusting the expected current value of the power receiving equipment according to the acquired current information to obtain an adjusted expected current value. The first preset range is a range of the variation value of the set oscillation amplitude. For example, a first preset range is set according to the variation amplitude of the strong oscillation. Thus, if the oscillation change parameter is within the first preset range, that is, the change value of the oscillation amplitude is within the first preset range, the change of the oscillation amplitude is larger; in this way, a larger value of the variation in the oscillation amplitude indicates a stronger oscillation of the power receiving apparatus, and thus it is determined that the power receiving apparatus has strong oscillation.

In some possible implementations, after determining that the powered device is in a state of strong oscillation, reducing the desired current value by the current information, resulting in a regulated desired current value; thus, the adjusted desired current value can achieve the purpose of suppressing strong oscillation.

And step S104, taking the adjusted expected current value as a first target value, and carrying out charging adjustment on the power receiving equipment based on the current information so as to enable the oscillation change parameter to be in a second preset range.

Here, in a state in which the power receiving apparatus is in strong oscillation, the power receiving apparatus is charge-adjusted with the adjusted desired current value as the first target value to suppress the strong oscillation of the power receiving apparatus; in this way, when strong oscillation occurs in the power receiving device, the current loop adjustment mode is adopted to boost the power receiving device, so that the oscillation variation parameter of the power receiving device can enter a second preset range.

Step S105, when the oscillation variation parameter is within the second preset range, performing charge adjustment on the power receiving device with the expected voltage value of the power receiving device as a second target value.

Here, the maximum value of the second preset range is smaller than the minimum value of the first preset range. The second preset range and the first preset range may be both set by user-defining an oscillation amplitude of the current of the power receiving device in the charging process. If the oscillation change parameter enters a second preset range, namely the oscillation change amplitude enters the second preset range, the change of the oscillation amplitude is smaller, and the condition that the power receiving equipment is in a weak oscillation state is further indicated, so that the expected voltage value of the power receiving equipment is taken as a second target value, and the voltage loop adjusting module is adopted to control the power receiving equipment to boost, so that boosting and charging are realized.

In the embodiment of the application, whether the oscillation change parameter is in the first preset range is analyzed through the current information, so that the expected current value of the power receiving equipment can be dynamically adjusted. Then, taking the adjusted expected current value as a first target value, and carrying out charging adjustment on the power receiving equipment based on the current information so as to enable the oscillation change parameter to be in a second preset range; in this way, by dynamically adjusting the adjusted desired current value to the first target value, the boosted charging of the power receiving apparatus can be achieved by the current loop adjustment mode. Under the condition that the oscillation change parameter is within a second preset range, taking the expected voltage value of the power receiving equipment as a second target value, and carrying out charging adjustment on the power receiving equipment; in this way, if the oscillation variation parameter is within the second preset range, the power receiving apparatus is boosted and charged with the desired voltage value as the second target value. Therefore, the target value is dynamically adjusted according to the preset range of the oscillation change parameter, so that the quick boost charging of the power receiving equipment can be realized, and the power receiving equipment can be protected from being damaged.

In some embodiments, by the current value of the power receiving apparatus and the historical current control value stored in the previous week, it can be accurately determined whether the oscillation frequency is within the first preset range, that is, the step S102 described above may be implemented by the steps shown in fig. 2A:

Step S201, determining a current change coefficient of a current period with respect to the previous period based on the current value and the historical current control value.

Here, the previous current value and the historical current control value are subtracted in the strong oscillation suppression adjustment module of the power receiving apparatus, and the resulting difference is taken as the current change coefficient of the present cycle with respect to the previous cycle.

Step S202, determining whether the oscillation variation parameter is within the first preset range based on the current variation coefficient and a preset current variation coefficient.

Here, if the current variation coefficient is larger than the preset current variation coefficient, it is determined that the oscillation variation parameter is within the first preset range, that is, that strong oscillation occurs in the power receiving apparatus. The preset current change coefficient is used for representing the magnitude of current change and can be set in a self-defined mode. If the current change coefficient is smaller than the preset current change coefficient, it is determined that the oscillation change parameter is not within the first preset range, that is, strong oscillation does not occur in the powered device. In this way, whether the current change coefficient of the current period relative to the previous period is larger than the preset current change coefficient is analyzed to determine whether the oscillation change parameter is within the first preset range, so that whether the power receiving equipment has strong oscillation can be accurately analyzed.

In some possible implementations, the current change coefficient is a current change slope, and the preset current change coefficient is a preset current change slope, so the step S202 may be implemented by the following processes: and if the current change slope is larger than the preset current change slope, determining that the oscillation change parameter is within the first preset range.

Here, the preset current change slope may be set according to the current difference value of adjacent two periods in the case where the strongest oscillation that can be tolerated occurs in the circuit. If the current change slope is larger than the preset current change slope, the current value in the current period is larger than the historical current control value stored in the previous period, so that the oscillation change parameter is in a first preset range, and the power receiving equipment is further indicated to generate strong oscillation. In this way, by analyzing whether the current change slope is excessively large, it is possible to quickly determine whether or not strong oscillation occurs in the power receiving apparatus.

In some embodiments, in the case where strong oscillation occurs in the power receiving apparatus, the desired current value of the power receiving apparatus is dynamically adjusted by the current information of the power receiving apparatus, that is, the above-described step S103 may be implemented by the steps shown in fig. 2B:

Step S221, comparing the current value with the historical current control value of the previous cycle.

Here, in the case where the oscillation change parameter is within the first preset range, the magnitude between the present current value and the history current control value of the previous cycle is compared.

Step S222, taking the historical current control value of the previous period as the current preset expected current value when the current value is greater than the historical current control value of the previous period.

Here, if the current value is greater than the historical current control value of the previous period, it is indicated that the slope of the current rise is too great, and the historical current control value is taken as the current preset expected current value, so that slope suppression of the current rise is realized to reduce the superposition of the oscillating currents to cause overcurrent and overvoltage protection or component failure damage.

Step S223, taking the current value as the current preset expected current value when the current value is less than or equal to the historical current control value of the previous period.

If the current value is smaller than or equal to the historical current control value of the previous period, the current falling slope is too large, the current value is taken as the current preset expected current value, so that the current falling is quickly followed, and the phenomenon that the current of the charging pile exceeds the current which can be output by the charging pile and the current is excessively flowed or limited is avoided.

Step S224, clipping the current preset expected current value to obtain the adjusted expected current value.

Here, the current preset desired current value is limited in accordance with the effective range of the charging current, thereby obtaining the adjusted desired current value such that the amplitude of the adjusted desired current value is within the effective range. The effective range may be 0 to a maximum boost charging current; that is, the adjusted desired current value is equal to or greater than zero and equal to or less than the maximum boost charging current that the boost charging system of the powered device can withstand.

In the embodiment of the application, the current preset expected current value of the current period is dynamically set by comparing the current value with the historical current control value of the previous period, so that the current preset expected current value can be more matched with the current value, and the strong oscillation can be restrained by the adjusted expected current value.

In some embodiments, after the strong oscillation of the powered device is suppressed, the current preset desired current value may be adjusted by:

and a first step of adjusting the historical current control value of the previous period by adopting a first preset adjustment amount under the condition that the oscillation change parameter is out of a first preset range to obtain a current preset expected current value.

And secondly, limiting the current preset expected current value to obtain the adjusted expected current value.

Here, in the case where the oscillation change parameter is out of the first preset range, description is made to a case where strong oscillation does not occur in the power receiving apparatus. The first preset adjustment amount is overlapped on the historical current control value to obtain a current preset expected current value, so that the rising slope of the boost charging current is limited by the first preset adjustment amount serving as the slow variable, the oscillation current can be restrained, and the occurrence of strong oscillation is reduced.

In some embodiments, the current loop adjustment mode is used to boost charge the powered device with the adjusted desired current value as the first target value to suppress strong oscillation of the powered device, that is, the step S104 may be implemented by the steps shown in fig. 2C:

step S231, determining a suppression duty cycle based on the present current value and the historical current control value in the current information.

Here, the current value of the power receiving apparatus is the current of the charging port of the power receiving apparatus during charging. Acquiring a current value of a power receiving apparatus, including: and collecting the current of the charging port of the power receiving equipment through a boosting charging current collecting module of the power receiving equipment to obtain the current value of the power receiving equipment.

In some possible implementations, in the strong oscillation suppression adjustment module of the powered device, the suppression duty cycle is determined based on the acquired current value of the powered device and the historical current control value stored in the last period. The suppression duty cycle includes: duty cycle for suppressing strong oscillations and duty cycle for adjusting weak oscillations. And proportional adjustment is carried out on the current value by taking the historical current control value stored in the previous period as a target to obtain a strong oscillation suppression duty ratio, and then current oscillation suppression is carried out when strong oscillation occurs in the circuit.

Step S232, determining an adjustment duty cycle based on the obtained current total voltage of the powered device, the current charging port voltage, and the desired charging port voltage of the powered device.

Here, the adjustment duty cycle is determined by a charging port coarse tuning module and a charging port fine tuning module based on the current total voltage, the current charging port voltage, and a desired charging port voltage of the powered device. The desired charging port voltage of the powered device refers to a desired input voltage of the boost charging module in the new energy vehicle, which is slightly lower than the maximum output voltage of the power supply device, and is the actual output voltage of the power supply device. The desired input voltage is a voltage determined according to a maximum output voltage of the power supply apparatus, and is the same as an actual output voltage of the power supply apparatus. Since in actual situations, the actual output voltage of the power supply device will not reach its own maximum output voltage, the expected input voltage is slightly lower than the maximum output voltage of the power supply device, and the specific difference between the expected input voltage and the maximum output voltage may be set according to the actual situations, which is not particularly limited in the embodiments of the present application.

In some embodiments, the power supply device may be a low voltage power supply device. Charging the new energy vehicle by the desired charging port voltage may improve charging efficiency.

In some embodiments, obtaining a desired charging port voltage of a powered device includes: and obtaining the maximum output voltage of the power supply equipment, and determining the expected charging port voltage of the power receiving equipment according to the maximum output voltage. In some embodiments, obtaining the maximum output voltage of the power supply device may include: sending a voltage acquisition request to power supply equipment; and receiving the maximum output voltage sent by the power supply equipment.

After the MCU acquires the maximum output voltage of the power supply device, a desired charging port voltage of the power receiving device may be determined according to the maximum output voltage. In an actual process, the actual output voltage of the power supply device often does not reach its own maximum output voltage, so the desired charging port voltage of the powered device needs to be determined according to the maximum output voltage. For example, when the maximum output voltage of the power supply device is 500V, the desired charging port voltage may be determined as 490V according to the maximum output voltage.

In some possible implementations, a duty cycle is used to indicate the percentage of time that the power switch of the motor winding is turned on over the entire circuit duty cycle. Adjusting the duty cycle includes: coarse and fine duty cycles. A coarse duty cycle between the current total voltage and a desired charging port voltage of the powered device is determined according to the type of circuit topology of the powered device. Adjusting the current charging port voltage by taking the expected charging port voltage as a target value, and determining a duty cycle between the adjusted current charging port voltage and the current charging port voltage; and then, according to the duty cycle and the voltage trimming duty cycle stored in the previous cycle, determining the trimming duty cycle of the current cycle. Thus, a rough adjustment of the current total voltage of the powered device can be achieved by the rough adjustment duty cycle, and a gradual adjustment of the voltage value of the charging port of the powered device can be achieved by the fine adjustment duty cycle.

Step S233, determining a chopping control duty cycle based on the adjustment duty cycle and the suppression duty cycle.

Here, when the oscillation change parameter of the power receiving apparatus is within the first preset range, that is, when strong oscillation occurs in the power receiving apparatus, in the adjustment signal combining module of the power receiving apparatus, the chopping control duty ratio is obtained by combining the adjustment duty ratio and the suppression duty ratio. The chopper control duty ratio is transmitted to a boost charging chopper control module of the power receiving apparatus, where a charging system of the power receiving apparatus is controlled in accordance with the chopper control duty ratio.

Step S234, when the chopper control duty ratio is in the current loop control mode, of setting the first target value to the adjusted desired current value and performing current loop control mode charge adjustment on the power receiving apparatus.

Here, the chopper control duty ratio is a current loop control mode, that is, when the oscillation change parameter of the power receiving apparatus is within a first preset range, that is, when strong oscillation occurs in the power receiving apparatus, the current loop control mode charge adjustment is performed on the power receiving apparatus with the adjusted desired current value as the target value. In the boost charging chopper control module, after receiving a chopper control duty cycle, a three-phase full bridge in a motor controller of the powered device, namely 6 switches, each phase of switch having a corresponding chopper control duty cycle; the three-phase switch controls the work of a charging system of the whole powered device according to the chopping control duty ratio; the control of the voltage and the current of the powered device is realized, a feedback regulation system is formed, and the boost charging is realized through the formed feedback loop. In this way, when strong oscillation occurs in the power receiving device, the duty ratio is adjusted and the duty ratio is restrained to perform combined calculation so as to obtain the chopping control duty ratio, and therefore the power receiving device is subjected to charging control through the chopping control duty ratio, and stable boosting charging of the power receiving device is achieved.

In the embodiment of the application, the current total voltage and the current charging port voltage of the power receiving equipment are obtained; determining an adjusting duty ratio through the current total voltage, the current charging port voltage and the expected charging port voltage of the powered device; determining an inhibition duty ratio through the current value of the power receiving equipment and the historical current control value stored in the previous period; setting a first target value as the regulated expected current value under the condition that the chopping control duty ratio is in a current loop control mode, and carrying out charging regulation on the current loop control mode of the power receiving equipment; in this way, by suppressing the duty ratio, current oscillation suppression is performed when strong oscillation occurs during charging of the power receiving apparatus. And the current total voltage and the current charging port voltage of the power receiving equipment can be smoothly regulated by combining the regulation duty ratio and the inhibition duty ratio so as to reduce LC oscillation and realize stable boosting charging of the power receiving equipment.

In some embodiments, after determining the chopping control duty cycle, the current value of the powered device is inversely adjusted based on the chopping control duty cycle, resulting in a current value of the powered device after the charge adjustment.

Here, in the boost charging chopper control module, the charging process of the powered device is controlled according to the chopper control duty ratio, and the current total voltage of the battery pack, the current charging port voltage of the powered device when the charging is disconnected and the current value are simultaneously influenced, so that the battery pack total voltage acquisition module, the charging port voltage acquisition module and the boost charging current acquisition module can acquire the current total voltage, the current charging port voltage and the current value after being influenced by the boost charging chopper control module; therefore, a circulating feedback loop can be formed in a charging system of the powered device, and further boosting and charging of the powered device can be achieved in the circulating feedback process of each period.

In some embodiments, the current total voltage is coarsely adjusted, and the current charging port voltage is finely adjusted, so as to obtain the adjusted duty cycle of the powered device, that is, the step S232 may be implemented by the following steps S2321 to S2323 (not shown in the drawing):

step S2321, determining a coarse voltage duty cycle based on the current total voltage and the desired charging port voltage.

Here, the coarse voltage duty cycle is obtained in the coarse charging port voltage adjustment module of the powered device by the ratio between the current total voltage and the desired charging port voltage. The coarse voltage duty cycle can characterize a difference between the current total voltage and the desired charging port voltage, such that the current total voltage can be adjusted by the coarse voltage duty cycle to cause the current total voltage to approach the desired charging port voltage.

In some possible implementations, the sampling rate of the current total voltage may be much lower than the period of determining the coarse voltage duty cycle, i.e. the current total voltage may be collected only once during a continuous number of periods of determining the coarse voltage duty cycle.

In some embodiments, by analyzing the type of circuit topology of the powered device, the coarse duty cycle is determined in such a manner that the type matches, i.e., step S2321 described above in the coarse charging port voltage adjustment module of the powered device may be implemented by the following steps S21 and S22 (not shown in the drawing):

step S21, acquiring a type of circuit topology of the powered device.

Here, the circuit topology is used for boost charging according to the current port voltage. Types of circuit topologies may include: common negative circuit topology and common positive circuit topology.

Step S22, determining the voltage coarse adjustment duty cycle between the current total voltage and the desired charging port voltage based on the type of the circuit topology.

Here, in the case where the type of the circuit topology is a common-negative-electrode circuit topology, the ratio of the current total voltage and the desired charging port voltage is taken as the voltage coarse adjustment duty ratio. Under the condition that the type of the circuit topology is a common positive circuit topology, determining the voltage coarse adjustment duty ratio according to the ratio of the voltage difference to the current total voltage of the powered device; the voltage difference is the difference between the current total voltage of the powered device and the desired charging port voltage. In this way, the coarse voltage duty cycle between the current total voltage and the desired charging port voltage is determined according to a calculation formula corresponding to the type of circuit topology. In this way, the accuracy of determining the coarse voltage duty cycle can be improved by determining different manners of determining the coarse voltage duty cycle according to different types of circuit topologies.

Step S2322, determining a voltage trimming duty cycle based on the current charging port voltage and the desired charging port voltage.

Here, the current charging port voltage is adjusted in the charging port voltage fine adjustment module of the powered device, so as to calculate and obtain the preliminary adjustment duty ratio. And then, the change slope between the historical voltage fine adjustment duty ratios stored in the previous period of the preliminary adjustment duty ratio is used for dynamically limiting the preliminary adjustment duty ratio so as to finally obtain the voltage fine adjustment duty ratio of the current period. Therefore, the adjustment amplitude of the voltage fine adjustment duty ratio in the current period does not exceed the effective range, and the smooth adjustment of the current charging port voltage is realized, so that the LC oscillation problem is reduced.

Step S2323, determining the adjustment duty cycle according to the voltage coarse adjustment duty cycle and the voltage fine adjustment duty cycle.

Here, adjusting the duty cycle includes: the voltage coarse-tuning duty cycle and the voltage fine-tuning duty cycle.

Through the steps S2321 to 2323, coarse adjustment is performed on the current total voltage to obtain a coarse voltage duty cycle, so that the MCU of the powered device can enable the current total voltage to be matched with the desired charging port voltage through the coarse voltage duty cycle, and boost charging can be performed on the powered device according to the desired charging port voltage. And fine-tuning the current charging port voltage to obtain a voltage fine-tuning duty cycle, and smoothly adjusting the current charging port voltage according to the voltage fine-tuning duty cycle to reduce LC oscillation problem.

In some embodiments, according to the duty cycle change slope of the current period relative to the previous period, determining the voltage trimming duty cycle of the current period so that the voltage trimming duty cycle of the current period does not exceed the effective range, and in the charging port voltage trimming module of the powered device, the step S2322 may be implemented by:

and a first step of setting the second target value as the expected charging port voltage, and adjusting the current charging port voltage to obtain an adjusted charging port voltage.

Here, the calculation of the Proportional Integral (PI) adjustment is performed on the current charging port voltage with the desired charging port voltage as the second target value, so that the voltage value after PI adjustment is taken as the adjusted charging port voltage. In this way, after PI adjustment of the current charge port voltage, the adjusted charge port voltage is made to approach the desired charge port voltage as the target value.

A second step of determining a preliminary adjustment duty cycle between the adjusted charge port voltage and the desired charge port voltage.

Here, the ratio between the adjusted charge port voltage and the desired charge port voltage is taken as the preliminary adjustment duty ratio.

And thirdly, determining the duty ratio change slope of the current period relative to the previous period based on the preliminary adjustment duty ratio and the history voltage fine adjustment duty ratio stored in the previous period.

Here, the preliminary adjustment duty ratio and the history voltage trimming duty ratio stored in the previous cycle are subtracted, and the result of the subtraction is taken as a duty ratio change slope.

And step four, under the condition that the change slope of the duty ratio is larger than or equal to the change slope of the preset duty ratio, adopting a second preset adjustment quantity to adjust the history voltage fine adjustment duty ratio to obtain the adjusted history voltage fine adjustment duty ratio.

Here, the positive and negative of the second preset adjustment amount are the same as the positive and negative of the duty ratio change slope, and the value of the second preset adjustment amount may be a smaller change amount. In some possible implementations, the second preset adjustment amount is a maximum change value under the slope of the duty cycle change, for example, the second preset adjustment amount is set to 1. The preset duty cycle change slope is the maximum change slope of the duty cycle change slope under the current period, the setting of the preset duty cycle change slope is associated with system parameters (such as the total voltage of a battery pack, the voltage of a charging port, the current of the charging port and the like) of the powered device, and the preset duty cycle change slopes corresponding to the powered devices of different system parameters are different.

If the absolute value of the duty cycle change slope is larger than or equal to the preset duty cycle change slope, the preliminary adjustment duty cycle of the current period is excessively large, and the preliminary adjustment duty cycle needs to be limited. Based on the direction of the change slope of the duty ratio, a second preset adjustment amount in the same direction is overlapped on the basis of the history voltage fine adjustment duty ratio stored in the previous period, and the adjusted history voltage fine adjustment duty ratio is obtained. For example, if the slope of the duty ratio change is positive, the second preset adjustment amount is positive, and the second preset adjustment amount which is positive is superimposed on the basis of the history voltage trimming duty ratio, so as to obtain the adjusted history voltage trimming duty ratio. If the change slope of the duty ratio is negative, the second preset adjustment quantity is also negative, and the second preset adjustment quantity which is negative is overlapped on the basis of the fine adjustment duty ratio of the historical voltage, so that the fine adjustment duty ratio of the adjusted historical voltage is obtained.

And fifthly, limiting the adjusted historical voltage trimming duty ratio to obtain the voltage trimming duty ratio.

Here, the amplitude of the trimming duty cycle of the adjusted history voltage is limited to obtain the trimming duty cycle of the current period, and the trimming duty cycle is stored so that the trimming duty cycle stored in the current period can be called in the next period. In some possible implementations, the amplitude of the adjusted historical voltage trim duty cycle may be limited by an amplitude range of 0 to 1 such that the trim duty cycle takes on a value between 0 and 1. In this way, in the charging port voltage fine adjustment module of the powered device, if the change slope of the duty ratio of the current period relative to the previous period is larger, the preliminary adjustment duty ratio of the current period is too large, so that an adjustment amount is superimposed on the basis of the historical fine adjustment duty ratio of the previous period, and the fine adjustment duty ratio of the adjusted historical voltage is limited, so that the fine adjustment duty ratio of the current period is obtained. Therefore, the fine adjustment duty ratio of the current period can be larger than the historical fine adjustment duty ratio of the previous period, so that the accuracy of the fine adjustment duty ratio of the current period is higher, and the fine adjustment duty ratio of the adjusted historical voltage is limited, so that the adjustment amplitude of the fine adjustment duty ratio of the current period cannot exceed the effective range.

And sixthly, limiting the preliminary adjustment duty ratio under the condition that the duty ratio change slope is smaller than or equal to a preset duty ratio change slope, so as to obtain the voltage fine adjustment duty ratio.

Here, if the duty cycle variation slope is smaller than the preset duty cycle variation slope, the value of the preliminary adjustment duty cycle is not limited, and the amplitude of the preliminary adjustment duty cycle may be directly limited so that the amplitude of the voltage fine adjustment duty cycle does not exceed the effective range. In this way, under the condition that the duty ratio change slope is smaller than the preset duty ratio change slope, the preliminary adjustment duty ratio is directly used as the voltage fine adjustment duty ratio of the current period; after the preliminary adjustment duty ratio is limited, the voltage trimming duty ratio which needs to be stored in the current period can be obtained, so that the voltage trimming duty ratio can more accurately reflect the difference between the voltage of the adjusted charging port and the voltage of the expected charging port.

In some embodiments, the current value is scaled by the historical current control value stored in the previous period, so that a strong oscillation suppression duty cycle can be obtained, which can be achieved by the following procedures:

and proportional adjustment is carried out on the current value according to the historical current control value, so that a strong oscillation suppression duty ratio is obtained.

Here, in the strong oscillation suppression adjustment module of the power receiving apparatus, the current value is adjusted with the use of the proportional adjustment loop with the history current control value as a target, resulting in a strong oscillation suppression duty ratio. In this way, the current value is scaled with the historical current control value as a target to obtain the strong oscillation suppression duty ratio, so that the strong oscillation in the circuit can be suppressed when the strong oscillation occurs in the power receiving apparatus by dynamically determining the strong oscillation suppression duty ratio of the current period.

In some embodiments, if the oscillation variation parameter of the powered device is within the second preset range, that is, if strong oscillation does not occur in the powered device, the voltage loop adjustment mode is used to perform boost charging adjustment on the powered device by suppressing a weak oscillation suppression duty cycle in the duty cycle, where the weak oscillation suppression duty cycle may be implemented by:

and step one, performing differential regulation on the current value to obtain a regulated charging current.

Here, the current value is adjusted in the weak oscillation suppression adjustment module of the power receiving apparatus according to the calculation formula of differential adjustment, and the obtained calculation result is the adjusted charging current.

And a second step of determining the weak oscillation suppression duty ratio based on the adjusted charging current and the present current value.

Here, the ratio of the adjusted charging current and the present current value is taken as the weak oscillation suppression duty ratio in the weak oscillation suppression adjustment module of the power receiving apparatus. In this way, by differentially adjusting the current value to determine the weak oscillation suppression duty ratio, the occurrence of oscillations in the circuit can be further reduced by performing boost charging adjustment on the power receiving apparatus by the weak oscillation suppression duty ratio.

In some embodiments, by clipping the duty cycle between the second modulated charging current and the present current value to obtain a weak oscillation suppression duty cycle, the "determining the weak oscillation suppression duty cycle based on the modulated charging current and the present current value in the above-mentioned second step" in the weak oscillation suppression accommodation module of the powered device "may be achieved by:

first, a duty cycle between the modulated charge current and the present current value is determined.

Here, the ratio between the adjusted charge current and the present current value is determined as the duty ratio between the adjusted charge current and the present current value.

And secondly, limiting the duty ratio to obtain the weak oscillation suppression duty ratio.

Here, the duty ratio is limited with a small amplitude, thereby obtaining a weak oscillation suppression duty ratio with a small amplitude range. For example, the duty ratio is limited with an amplitude of 0.1 so that the amplitude of the weak oscillation suppression duty ratio is 0.1, thereby making the weak oscillation suppression duty ratio less influencing the chopping control duty ratio. In this way, by limiting the duty ratio between the adjusted charging current and the present current value, the amplitude range of the obtained weak oscillation suppression duty ratio is smaller, so that the problem of strong oscillation again is not induced.

In some embodiments, in a case where the oscillation variation parameter of the power receiving apparatus is within the first preset range, the chopper control duty ratio is obtained by combining the adjustment duty ratio and the suppression duty ratio in the adjustment signal combining module of the power receiving apparatus, and the charge control is performed by the boost charge chopper control module, that is, the above-described step S233 may be achieved by the following steps S2331 to S2334 (not shown in the drawing):

in step S2331, a coarse voltage duty cycle is obtained.

Here, a voltage coarse adjustment duty cycle determined based on the current total voltage and the desired charging port voltage is obtained.

Step S2332, determining a strong oscillation difference duty cycle based on the coarse voltage duty cycle and the quench duty cycle.

Here, the voltage coarse-tuning duty cycle is subtracted from the voltage fine-tuning duty cycle to obtain the strong oscillation difference duty cycle.

And step S2333, limiting the strong oscillation difference duty ratio based on the preset port current of the power supply equipment to obtain the current limited duty ratio.

Here, the current limiting is performed on the strong oscillation difference duty ratio according to an upper limit current value and a lower limit current value in the preset port current of the power supply device; in this way, the limited duty cycle of the current does not cause the current to vary beyond the preset port current.

Step S2334, determining the chopping control duty cycle based on the current limited duty cycle and the regulation duty cycle.

Here, the chopping suppression duty cycle is obtained by combining the current limited duty cycle and the adjustment duty cycle. The chopper control duty cycle can be determined by comparing the obtained voltage limited duty cycle with the current limited duty cycle by voltage limiting the adjustment duty cycle. In some possible implementations, this can be achieved by:

first, a voltage limiting duty cycle is determined based on the current total voltage, the desired charging port voltage, and a preset limiting voltage.

Here, the preset limiting voltage is used to characterize a voltage range, the boundary voltage of which can be set according to the maximum voltage value and the minimum voltage value that the charging device can withstand.

In some possible implementations, a voltage limit duty cycle is determined in a charging port voltage clipping module of the powered device based on the current total voltage, the desired charging port voltage, a preset limit voltage. Determining an upward-deflectable voltage and a downward-deflectable voltage of the expected charging port voltage through two boundary voltages of a preset limiting voltage and the expected charging port voltage; and then, the duty ratios between the upper deviation value voltage and the lower deviation value voltage and the current total voltage are respectively determined to obtain the duty ratios corresponding to the two boundaries, namely the voltage limiting duty ratio.

And secondly, performing voltage limiting on the regulating duty ratio based on the voltage limiting duty ratio to obtain a voltage limited duty ratio.

Here, the adjustment duty ratio is voltage-limited in accordance with an upper limit duty ratio and a lower limit duty ratio among the voltage-limited duty ratios such that the voltage-limited duty ratio falls between the upper limit duty ratio and the lower limit duty ratio. In this way, the limited duty cycle of the voltage does not cause the voltage variation range to go beyond the expected range.

And thirdly, comparing the numerical relation between the voltage limited duty cycle and the current limited duty cycle.

Here, the magnitude of the voltage limited duty cycle and the magnitude of the current limited duty cycle are compared, that is, the voltage limited duty cycle is greater than or equal to the current limited duty cycle, or the voltage limited duty cycle is less than the current limited duty cycle.

And fourthly, determining that the chopping control duty ratio is a current loop control mode or a voltage loop control mode based on the type of the circuit topology of the powered device and the numerical relation.

Here, the target duty ratio is selected among the voltage limited duty ratio and the current limited duty ratio according to the type of the circuit topology of the power receiving apparatus. In some possible implementations, if the type of circuit topology is a common-anode connection, selecting a minimum duty cycle of the voltage limited duty cycle and the current limited duty cycle as the target duty cycle; at this time, if the current limited duty ratio is the minimum duty ratio, it is determined that the chopping control chopping ratio is the current loop control module, and the weak oscillation suppression duty ratio in the suppression duty ratio is subtracted from the voltage limited duty ratio to obtain the chopping control duty ratio, and the obtained chopping control duty ratio is transmitted to the boost chopping control module. If the type of the circuit topology is a common-negative connection mode, selecting the maximum duty ratio from the voltage limited duty ratio and the current limited duty ratio as a target duty ratio; at this time, if the voltage limited duty ratio is the maximum duty ratio, the chopping control chopping ratio is determined to be the voltage loop control module.

In the embodiment of the application, the voltage limiting duty ratio is used for carrying out voltage limiting on the regulating duty ratio to obtain the voltage limited duty ratio, so that the numerical relation between the voltage limited duty ratio and the current limited duty ratio can be determined. Then, determining a target duty cycle in the voltage limited duty cycle and the current limited duty cycle according to the type of the circuit topology of the powered device; fine tuning the target duty cycle by suppressing weak oscillation in the duty cycle to obtain a chopping control duty cycle; in this way, the boost charging system of the power receiving apparatus can be accurately controlled by the chopper control duty, and since the amplitude of the weak oscillation suppression duty is small, the amplitude of the variation of the chopper control duty does not induce the oscillation problem again.

The application of the charge adjusting method provided by the embodiment of the application in actual scenes is described below. Referring to fig. 3, fig. 3 is a schematic circuit topology diagram of boost charging using a charge adjustment method according to an embodiment of the present application, and the following description is made with reference to fig. 3. In fig. 3, the vehicle 30 is a vehicle that performs boost charging by sharing a motor and a motor controller (Motor Control Unit, MCU). The vehicle 30 includes: a battery pack 301, a motor controller 302, a motor 303, a capacitor C3, switches S3 and S4; also included in fig. 3 is a dc fast charge stake 304 for charging the battery pack 301. When boost charging is needed, the switch S4 is opened, the switch S3 is closed, the output voltage of the direct current fast charging pile is lower than the voltage of the battery pack, any phase of the motor is connected with the boost charging capacitor C3, in addition, the two phases are subjected to switch control, the motor inductance is utilized for boost, and the boost charging of the direct current fast charging pile to the battery pack is realized.

Fig. 4 is a schematic diagram of another vehicle topology for boost charging by using the charge adjustment method according to the embodiment of the present application, and the following description is made with reference to fig. 4. In fig. 4, when the vehicle 40 needs to be boosted and charged, the switch S4 is turned off, the switch S3 is turned on, the output voltage of the dc fast charging pile 304 is lower than the battery pack voltage, the neutral point of the motor 303 is turned on with the boost charging capacitor C3, the three phases are switched to control the switching, and the boost is performed by using the motor inductance, so that the boost and charge of the dc fast charging pile to the battery pack 301 is realized.

The charging adjustment method provided by the embodiment of the application can be implemented through a frame diagram shown in fig. 5, and in fig. 5, an implementation frame of the charging adjustment method includes: boost charge chopper control module 501, battery pack total voltage acquisition module 502, charge port voltage coarse adjustment module 503, charge port voltage limiting module 504, charge port voltage acquisition module 505, charge port voltage fine adjustment module 506, adjustment signal combination module 507, boost charge current acquisition module 508, weak oscillation suppression adjustment module 509, strong oscillation suppression adjustment module 510. Wherein: the boost charging chopper control module 501 is a boost charging execution module of the motor controller MCU, and during boost charging execution, the total voltage of the battery pack, the charging port voltage and the boost charging current are affected and can be detected by the corresponding acquisition module. The total battery pack voltage acquired by the total battery pack voltage acquisition module 502 can be provided for the rough voltage calculation of the charging port voltage rough adjustment module 503, and also provided for the voltage limiting duty ratio calculation of the charging port voltage limiting module 504, and the calculated values of the two modules can be provided for the adjustment signal combination module 507. The charging port voltage acquired by the charging port voltage acquisition module 505 can be provided for the charging port voltage trimming module 506 to perform voltage trimming calculation, and the calculated value can be provided for the adjustment signal combination module 507 to use. The boost charging current acquired by the boost charging current acquisition module 508 can be provided for the weak oscillation suppression adjustment module 509 to perform weak oscillation suppression calculation, and also provided for the strong oscillation suppression module 510 to perform strong oscillation suppression calculation, and the numerical value obtained after calculation of the two modules can be provided for the adjustment signal combination module to use. And after the adjustment signal merging module obtains the calculated values of the modules, signal calculation merging is carried out to obtain the required control duty ratio, the control duty ratio is provided for the boost charging chopper control module to execute, a complete feedback control loop is formed, and stable and reliable voltage transformation control type boost charging is realized.

In some embodiments, the implementation flow of the charging port voltage coarse adjustment module is shown in fig. 6, and may be implemented by the following steps:

step S601, receiving a current total voltage Ubat value of the battery pack, which is given by the total voltage acquisition module of the battery pack.

Step S602, reads the current desired charging port voltage uchg_ex.

Step S603, determining a rough voltage duty cycle according to a preset formula.

Here, the preset formula may be uchg_ex=ubat (1-D) or uchg_ex=ubat×d. The calculation formula corresponding to the common positive electrode connection is uchg_ex=ubat (1-D), and the calculation formula corresponding to the common negative electrode connection is uchg_ex=ubat×d.

In step S604, the output voltage coarsely adjusts the duty cycle.

In some embodiments, the implementation flow of the electric port voltage clipping module is shown in fig. 7, and may be implemented by the following steps:

step S701, receiving the current total voltage Ubat value of the battery pack given by the total voltage acquisition module of the battery pack.

Step S702, reads the current desired charging port voltage uchg_ex.

In step S703, an upgradeable value u_up of the control voltage is set.

In step S704, a downable value u_down of the control voltage is set.

Step S705, calculating the highest control voltage of the charging port.

Here, the highest control voltage is uchg_ exU =uchg_ex+u_up.

In step S706, the lowest control voltage of the charging port is calculated.

Here, the lowest control voltage is uchg_ exD =uchg_ex-u_down.

Step S707, a voltage upper limit duty cycle is determined.

In step S708, a voltage lower limit duty cycle is determined.

Here, the formula employed in determining the duty cycle is: the calculation formulas of the common positive electrode connection mode are uchg_ exU =ubat (1-Du) and uchg_ exD =ubat (1-Dd), and the calculation formulas of the common negative electrode connection mode are uchg_ exU =ubat×du and uchg_ exD =ubat×dd.

Step S709 outputs a voltage upper limit duty cycle and a voltage lower limit duty cycle.

In some embodiments, the implementation flow of the charging port voltage trimming module is shown in fig. 8, and may be implemented by the following steps:

step S801 receives the current voltage Uchg of the charging port given by the charging port voltage acquisition module.

Here, the Uchg numerical sampling rate may be low, typically between 50 microseconds (us) and 1 second(s).

Step S802, PI regulation is carried out by taking a preset current charging port voltage Uchg_ex as a target value, and a preliminary regulation duty ratio is obtained.

Here, after receiving the Uchg value, the charging port voltage fine adjustment module performs PI adjustment with the preset current charging port voltage uchg_ex as a target value, so as to obtain a preliminary adjustment duty cycle.

Step S803, determining a change slope of the preliminary adjustment duty ratio with respect to the previous period based on the preliminary adjustment duty ratio and the voltage fine adjustment duty ratio stored in the previous period.

Here, the change slope of the preliminary adjustment duty ratio with respect to the previous period may be calculated by subtracting the preliminary adjustment duty ratio from the voltage trimming duty ratio stored in the previous period.

Step S804, judging whether the change slope is larger than a preset maximum slope.

Here, the change slope is a current change slope, and if the current change slope is greater than the preset maximum slope, step S805 is performed; if the current variation slope is less than or equal to the preset maximum slope, the process proceeds to step S806.

Step S805, limiting the preliminary adjustment duty cycle slope.

Here, if the fruit current variation slope is greater than the preset maximum slope, the duty ratio is finely adjusted based on the voltage stored in the previous period, and the maximum variation value of the variation in the same direction as the preliminary adjustment duty ratio under the preset maximum slope is superimposed to obtain the adjustment duty ratio after limitation.

Step S806, clipping the voltage trimming duty cycle.

Here, if the change slope is less than or equal to the preset maximum slope, the preliminary adjustment duty ratio is not limited. And then limiting the voltage fine adjustment duty ratio to prevent the adjustment amplitude from exceeding the effective range.

Step S807, store and output the current voltage trimming duty cycle.

In the embodiment of the application, the calling period of the charging port voltage fine-tuning module can be consistent with the chopping period, generally can be 20us to 100us, and the approximate duty ratio can be adjusted gradually under the condition that the charging port acquisition voltage updating period is far higher than the chopping period, so that the problem of LC oscillation induction caused by smooth adjustment and reduction of the duty ratio of the voltage ring is realized.

In some embodiments, the implementation flow of the strong oscillation suppression adjustment module is shown in fig. 9, and may be implemented by the following steps:

step S901, receiving and storing the current value given by the boost charging current collection module.

Step S902, determining a change slope of the boost charging current value with respect to the previous period according to the boost charging current value stored in the previous period.

Step S903, determine whether the change slope is greater than a preset maximum slope.

Here, if the change slope is greater than the preset maximum slope, step S904 is entered; if the change gradient is less than or equal to the preset maximum gradient, the process proceeds to step S907.

Step S904, it is determined whether the boost charging current value in the present period is greater than the boost charging current control value stored in the previous week.

Here, if the boost charging current value of the present period is greater than the boost charging current control value stored in the previous week, the process proceeds to step S905; if the boost charge current value of the present cycle is less than or equal to the boost charge current control value stored in the previous week, the process proceeds to step S906.

Step S905 sets the boost charging current control value stored in the previous cycle as the desired boost charging current value.

Step S906 sets the boost charge current value in the present period as the desired boost charge current.

In step S907, the sum of the boost charge current control value stored in the previous cycle and the preset boost charge current ramp amount is used as the desired boost charge current control value.

Here, when the change slope is larger than the preset maximum slope, it is determined that a strong oscillation condition occurs. At this time, the current value is compared with the control value of the previous cycle, and when the boost charging current value of the present cycle is greater than the boost charging current control value stored in the previous cycle, that is, the current rising slope is too large, the desired boost charging current value is set as the boost charging current control value stored in the previous cycle, so as to realize current rising slope inhibition to avoid overcurrent and overvoltage protection or component failure damage caused by superposition of oscillating currents. When the current value of the boost charging current in the period is smaller than or equal to the control value of the boost charging current stored in the previous period, namely the current falling slope is overlarge, the expected boost charging current is set to be the current value of the boost charging current in the period, so that the current falling can be quickly followed, and the current falling under the control of the motor controller is reduced to exceed the current which can be output by the charging pile, so that the overcurrent or current limiting protection of the charging pile is caused. When the change slope is smaller than or equal to a preset maximum slope, judging that strong oscillation is not generated currently, and setting a desired boost charging current control value to be the sum of a boost charging current control value stored in the previous period and delta I, wherein delta I is a preset boost charging current slow variable, and limiting the rising slope of the boost charging current by the slow variable so as to inhibit strong oscillation.

Step S908 performs amplitude limitation on the desired boost charging current value.

Here, the calculated desired boost charging current value is limited in amplitude so that the value is within an effective range, so that the current is zero or more, that is, the current direction is the charging direction, and also so that the current is equal to or less than the maximum boost charging current that the vehicle boost charging system can withstand.

Step S909, the obtained desired boost charging current control value is stored for use in the next cycle.

Step S910, taking the desired boost charging current control value as a control target, performing a proportional adjustment on the charging current, and outputting a strong oscillation suppression duty cycle.

Here, the charging current is P-regulated with the desired boost charging current control value as a control target, and a strong oscillation suppression duty ratio is output to the regulation signal combining module for current oscillation suppression at the time of strong oscillation.

In some embodiments, the implementation flow of the weak oscillation suppression adjustment module is shown in fig. 10, and may be implemented by the following steps:

step S1001, receiving the current value given by the boost charging current collection module, performing differential adjustment, and determining the duty ratio for suppressing weak oscillation according to the boost charging current and the current value after differential adjustment.

Step S1002, clipping is performed on the weak oscillation suppression duty ratio.

Here, the defined amplitude range is small so that the amplitude of variation of the weak oscillation suppression duty cycle does not induce the oscillation problem again. The weak oscillation suppression duty ratio obtained after amplitude limiting is provided for the adjusting signal merging module to use.

In some embodiments, the implementation framework of the adjustment signal combining module 1100 is shown in fig. 11, and may be implemented by subtracting the voltage fine adjustment duty cycle 1102 from the voltage coarse adjustment duty cycle 1101 in fig. 11, and performing voltage adjustment clipping 1103, and limiting the duty cycle within a duty cycle range (Min/Max 1105) corresponding to the upper and lower voltage limits to define a voltage adjustment range, so that the control duty cycle of the output of the voltage adjustment branch does not cause the voltage variation range to exceed the expected range. The duty cycle effectiveness limiting 1107 is performed after the voltage rough adjustment duty cycle 1101 minus the strong oscillation suppression duty cycle 1104, and the charging port is reduced to exceed the maximum working voltage of the charging pile, so that the charging is failed and even the charging pile is damaged. The control duty ratio of the output after the voltage regulation and amplitude limiting and the control duty ratio of the output after the duty ratio validity amplitude limiting are subjected to one-to-two selection: for the connection mode of the common positive electrode, the two are minimum values; for the common negative electrode connection mode, the two are at maximum values. In this way, the transition between the current loop and the voltage loop is ensured in an alternative manner, the voltage loop control is dominant in the non-strong oscillation phase, and the current loop control is dominant in the strong oscillation phase. The control duty cycle after the two options is subtracted by the weak oscillation suppression duty cycle 1108 to obtain the chopping control duty cycle 1106 and output to the boost charging chopping control module for control.

In the embodiment of the application, the protection of the charging pile can be prevented from being triggered due to the asynchronous current control of the charging pile and the motor controller while strong oscillation is restrained, and the voltage sampling rate can be far lower than the duty cycle adjusting period so as to be suitable for scenes with low voltage sampling rate; meanwhile, the charging failure and even damage of the charging pile caused by the fact that the charging port exceeds the maximum working voltage of the charging pile can be reduced.

An embodiment of the present application provides a charging adjustment device, and fig. 12 is a schematic diagram of a composition structure of a charging adjustment device 1200 provided by the embodiment of the present application, as shown in fig. 12, where the device includes: a current information obtaining module 1201, configured to obtain current information of a charging port of the powered device; an oscillation change parameter determination module 1202 configured to determine an oscillation change parameter of the power receiving apparatus based on the current information; a current value adjustment module 1203 configured to adjust, based on the current information, an expected current value of the powered device to obtain an adjusted expected current value if the oscillation variation parameter is within a first preset range; a current loop adjustment module 1204, configured to charge and adjust the powered device based on the current information with the adjusted expected current value as a first target value, so that the oscillation change parameter is within a second preset range; and a voltage loop adjustment module 1205, configured to adjust charging of the powered device with a desired voltage value of the powered device as a second target value when the oscillation variation parameter is within the second preset range.

In some embodiments, the current information includes: the current value of the powered device and the historical current control value stored in the previous period; the oscillation change parameter determining module 1202 is further configured to: determining a current change coefficient of a current period relative to the previous period based on the current value and the historical current control value; and judging whether the oscillation change parameter is within the first preset range or not based on the current change coefficient and a preset current change coefficient.

In some embodiments, the current change coefficient is a current change slope, and the preset current change coefficient is a preset current change slope; the oscillation change parameter determining module 1202 is further configured to: and if the current change slope is larger than the preset current change slope, determining that the oscillation change parameter is within the first preset range.

In some embodiments, the current value adjustment module 1203 is further configured to: comparing the current value with the historical current control value of the previous period; taking the historical current control value of the previous period as a current preset expected current value under the condition that the current value is larger than the historical current control value of the previous period; taking the current value as the current preset expected current value under the condition that the current value is smaller than or equal to the historical current control value of the previous period; and limiting the current preset expected current value to obtain the regulated expected current value.

In some embodiments, the apparatus further comprises: the current control value adjusting module is used for adjusting the historical current control value of the previous period by adopting a first preset adjusting quantity under the condition that the oscillation change parameter is out of a first preset range to obtain a current preset expected current value; and the expected current value limiting module is used for limiting the current preset expected current value to obtain the adjusted expected current value.

In some embodiments, the current loop adjustment module 1204 is further configured to: determining a suppression duty cycle based on the present current value and the historical current control value in the current information; determining an adjustment duty cycle based on the obtained current total voltage of the powered device, the current charging port voltage, and the desired charging port voltage of the powered device; determining a chopping control duty cycle based on the adjustment duty cycle and the suppression duty cycle; and setting the first target value to the regulated expected current value when the chopping control duty ratio is in a current loop control mode, and carrying out current loop control mode charging regulation on the power receiving equipment.

In some embodiments, the current loop adjustment module 1204 is further configured to: determining a coarse voltage duty cycle based on the current total voltage and the desired charging port voltage; determining a voltage trim duty cycle based on the current charge port voltage and the desired charge port voltage; and determining the regulating duty ratio according to the voltage rough regulating duty ratio and the voltage fine regulating duty ratio.

In some embodiments, the current loop adjustment module 1204 is further configured to: setting the second target value as the expected charging port voltage, and adjusting the current charging port voltage to obtain an adjusted charging port voltage; determining a preliminary adjustment duty cycle between the adjusted charge port voltage and the desired charge port voltage; determining a duty cycle change slope of a current period relative to a previous period based on the preliminary adjustment duty cycle and a historical voltage fine adjustment duty cycle stored in the previous period; when the duty ratio change slope is larger than or equal to a preset duty ratio change slope, a second preset adjustment amount is adopted to adjust the historical voltage fine adjustment duty ratio, so that the adjusted historical voltage fine adjustment duty ratio is obtained; and clipping the adjusted historical voltage trimming duty ratio to obtain the voltage trimming duty ratio.

In some embodiments, the apparatus further comprises: and the duty cycle amplitude limiting module is used for limiting the preliminary adjustment duty cycle under the condition that the duty cycle change slope is smaller than or equal to a preset duty cycle change slope, so as to obtain the voltage fine adjustment duty cycle.

In some embodiments, the quench duty cycle comprises a strong oscillation quench duty cycle; the current loop adjustment module 1204 is further configured to: and proportional adjustment is carried out on the current value according to the historical current control value, so that a strong oscillation suppression duty ratio is obtained.

In some embodiments, the quench duty cycle comprises a weak oscillation quench duty cycle; the current loop adjustment module 1204 is further configured to: differential adjustment is carried out on the current value to obtain an adjusted charging current; the weak oscillation suppression duty cycle is determined based on the regulated charging current and the present current value.

In some embodiments, the current loop adjustment module 1204 is further configured to: determining a duty cycle between the modulated charge current and the present current value; and limiting the duty ratio to obtain the weak oscillation suppression duty ratio.

In some embodiments, the current loop adjustment module 1204 is further configured to: acquiring a voltage rough adjustment duty ratio; determining a strong oscillation difference duty cycle based on the voltage coarse adjustment duty cycle and the suppression duty cycle; limiting the strong oscillation difference value duty ratio based on the preset port current of the power supply equipment to obtain a current limited duty ratio; the chopping control duty cycle is determined based on the current limited duty cycle and the regulation duty cycle.

In some embodiments, the current loop adjustment module 1204 is further configured to: determining a voltage limiting duty cycle based on the current total voltage, the desired charging port voltage, and a preset limiting voltage; performing voltage limiting on the adjustment duty cycle based on the voltage limiting duty cycle to obtain a voltage limited duty cycle; comparing the numerical relationship of the voltage limited duty cycle and the current limited duty cycle; and determining that the chopping control duty ratio is a current loop control mode or a voltage loop control mode based on the type of the circuit topology of the powered device and the numerical relation.

An embodiment of the present application provides a charge adjusting device, fig. 13 is a schematic diagram of a composition structure of a charge adjusting device 1300 provided in an embodiment of the present application, as shown in fig. 13, where the device includes: processor 1301, communication interface 1302, and memory 1303, wherein: processor 1301 generally controls the overall operation of computer apparatus 1300, which may be the implementation of the charge adjustment method provided by embodiments of the present application. The communication interface 1302 may enable a computer device to communicate with other terminals or servers over a network. The memory 1303 is configured to store instructions and applications executable by the processor 1301, and may also cache data (e.g., image data, audio data, voice communication data, and video communication data) to be processed or processed by each module in the processor 1301 and the computer apparatus 1300, and may be implemented by a FLASH memory (FLASH) or a random access memory (Random Access Memory, RAM). Data may be transferred between processor 1301, communication interface 1302, and memory 1303 via bus 1304.

Embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a readable storage medium. The processor of the computer device reads the computer instructions from the readable storage medium, and the processor executes the computer instructions, so that the computer device executes the charge adjustment method according to the embodiment of the present application.

An embodiment of the present application provides a readable storage medium storing executable instructions, in which the executable instructions are stored, which when executed by a processor, cause the processor to perform the charge adjustment method provided by the embodiment of the present application. In some possible implementations, the readable storage medium may be FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface memory, optical disk, or CD-ROM; but may be a variety of devices including one or any combination of the above memories. In some possible implementations, the executable instructions may be in the form of programs, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and they may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment. As an example, the executable instructions may, but need not, correspond to files in a file system, may be stored as part of a file that holds other programs or data, for example, in one or more scripts in a hypertext markup language (HTML, hyper Text Markup Language) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub-programs, or portions of code).

As an example, executable instructions may be deployed to be executed on one computing device or on multiple computing devices located at one site or, alternatively, distributed across multiple sites and interconnected by a communication network.

The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A method of charge regulation, the method comprising:

acquiring current information of a charging port of the powered device;

2. The method of claim 1, wherein the current information comprises: the current value of the powered device and the historical current control value stored in the previous period; the determining, based on the current information, an oscillation change parameter of the power receiving apparatus includes:

determining a current change coefficient of a current period relative to the previous period based on the current value and the historical current control value;

and judging whether the oscillation change parameter is within the first preset range or not based on the current change coefficient and a preset current change coefficient.

3. The method of claim 2, wherein the current change coefficient is a current change slope and the predetermined current change coefficient is a predetermined current change slope; the determining whether the oscillation change parameter is within the first preset range based on the current change coefficient and a preset current change coefficient includes:

and if the current change slope is larger than the preset current change slope, determining that the oscillation change parameter is within the first preset range.

4. The method according to claim 2 or 3, wherein, in the case where the oscillation change parameter is within a first preset range, adjusting the desired current value of the powered device based on the current information, to obtain an adjusted desired current value, comprises:

Comparing the current value with the historical current control value of the previous period;

taking the historical current control value of the previous period as a current preset expected current value under the condition that the current value is larger than the historical current control value of the previous period;

taking the current value as the current preset expected current value under the condition that the current value is smaller than or equal to the historical current control value of the previous period;

and limiting the current preset expected current value to obtain the regulated expected current value.

5. A method according to claim 2 or 3, wherein said determining whether said oscillation variation parameter is within said first preset range based on said current variation coefficient and a preset current variation coefficient, said method further comprises:

when the oscillation change parameter is out of a first preset range, a first preset adjustment amount is adopted to adjust the historical current control value of the previous period, so that a current preset expected current value is obtained;

6. The method according to claim 1, wherein the charging adjustment of the power receiving apparatus based on the current information with the adjusted desired current value as a first target value so that the oscillation change parameter is within a second preset range, comprises:

Determining a suppression duty cycle based on the present current value and the historical current control value in the current information;

determining an adjustment duty cycle based on the obtained current total voltage of the powered device, the current charging port voltage, and the desired charging port voltage of the powered device;

determining a chopping control duty cycle based on the adjustment duty cycle and the suppression duty cycle;

and setting the first target value to the regulated expected current value when the chopping control duty ratio is in a current loop control mode, and carrying out current loop control mode charging regulation on the power receiving equipment.

7. The method of claim 6, wherein the determining an adjustment duty cycle based on the obtained current total voltage of the powered device, current charging port voltage, and desired charging port voltage of the powered device comprises:

determining a coarse voltage duty cycle based on the current total voltage and the desired charging port voltage;

determining a voltage trim duty cycle based on the current charge port voltage and the desired charge port voltage;

and determining the regulating duty ratio according to the voltage rough regulating duty ratio and the voltage fine regulating duty ratio.

8. The method of claim 7, wherein the determining a voltage trim duty cycle based on the current charge port voltage and the desired charge port voltage comprises:

setting the second target value as the expected charging port voltage, and adjusting the current charging port voltage to obtain an adjusted charging port voltage;

determining a preliminary adjustment duty cycle between the adjusted charge port voltage and the desired charge port voltage;

determining a duty cycle change slope of a current period relative to a previous period based on the preliminary adjustment duty cycle and a historical voltage fine adjustment duty cycle stored in the previous period;

when the duty ratio change slope is larger than or equal to a preset duty ratio change slope, a second preset adjustment amount is adopted to adjust the historical voltage fine adjustment duty ratio, so that the adjusted historical voltage fine adjustment duty ratio is obtained;

and clipping the adjusted historical voltage trimming duty ratio to obtain the voltage trimming duty ratio.

9. The method of claim 8, wherein the fine-tuning the duty cycle based on the preliminary adjustment duty cycle and the historical voltage stored for the last cycle, the method further comprises, after determining the duty cycle change slope for the current cycle relative to the last cycle:

And under the condition that the duty ratio change slope is smaller than or equal to a preset duty ratio change slope, limiting the preliminary adjustment duty ratio to obtain the voltage fine adjustment duty ratio.

10. The method of claim 6, wherein the quench duty cycle comprises a strong oscillation quench duty cycle; the determining the suppression duty ratio based on the present current value and the historical current control value in the current information comprises the following steps:

11. The method of claim 6, wherein the suppression duty cycle comprises a weak oscillation suppression duty cycle; the determining the suppression duty ratio based on the present current value and the historical current control value in the current information comprises the following steps:

differential adjustment is carried out on the current value to obtain an adjusted charging current;

the weak oscillation suppression duty cycle is determined based on the regulated charging current and the present current value.

12. The method of claim 11, wherein the determining a weak oscillation suppression duty cycle based on the modulated charging current and the present current value comprises:

Determining a duty cycle between the modulated charge current and the present current value;

and limiting the duty ratio to obtain the weak oscillation suppression duty ratio.

13. The method of claim 6, wherein the determining a chopping control duty cycle based on the adjustment duty cycle and the suppression duty cycle comprises:

acquiring a voltage rough adjustment duty ratio;

determining a strong oscillation difference duty cycle based on the voltage coarse adjustment duty cycle and the suppression duty cycle;

limiting the strong oscillation difference value duty ratio based on the preset port current of the power supply equipment to obtain a current limited duty ratio;

the chopping control duty cycle is determined based on the current limited duty cycle and the regulation duty cycle.

14. The method of claim 13, wherein the determining the chopping control duty cycle based on the current limited duty cycle and the adjusted duty cycle comprises:

determining a voltage limiting duty cycle based on the current total voltage, the desired charging port voltage, and a preset limiting voltage;

performing voltage limiting on the adjustment duty cycle based on the voltage limiting duty cycle to obtain a voltage limited duty cycle;

Comparing the numerical relationship of the voltage limited duty cycle and the current limited duty cycle;

and determining that the chopping control duty ratio is a current loop control mode or a voltage loop control mode based on the type of the circuit topology of the powered device and the numerical relation.

15. A charge conditioning device, the device comprising: