CN107009907B

CN107009907B - Output sampling method and device of charging device

Info

Publication number: CN107009907B
Application number: CN201710187402.0A
Authority: CN
Inventors: 李仲卿; 陈宗静; 黄江鹏
Original assignee: Shenzhen Ce Newpower New Energy Technology Co ltd
Current assignee: Shenzhen Ce Newpower New Energy Technology Co ltd
Priority date: 2017-03-27
Filing date: 2017-03-27
Publication date: 2023-05-19
Anticipated expiration: 2037-03-27
Also published as: CN107009907A

Abstract

The invention is suitable for the technical field of electric automobile charging, and provides a charging device output sampling method and device. The method comprises the following steps: sampling output voltage and/or current of the charging device in real time; comparing the current sampling value with the current average value; the current average value is an average value of all sampling values currently stored in the data buffer module; and when the difference value between the current sampling value and the current average value meets a preset condition, the sampling value stored in the data buffer module is emptied to store a new sampling value. The method does not consume a large amount of storage resources, can sample and monitor the output of the charging device more quickly, and achieves quick response to the output of the charging device.

Description

Output sampling method and device of charging device

Technical Field

The invention belongs to the technical field of electric automobile charging, and particularly relates to an output sampling method and device of a charging device.

Background

With the rapid development of electric vehicles, the charging technology of electric vehicles is becoming a key point of whether electric vehicles can realize a great deal of popularization. In general, when an electric automobile is charged, the output current and/or voltage of the charging device needs to be sampled in real time and fed back to the control end in time so as to monitor the charging process of the electric automobile. In the conventional method for sampling the output current and/or voltage of the charging device, the sampling result occupies a relatively large memory of the MCU (Microcontroller Unit, micro control unit), so that when the output current and/or voltage of the charging device changes, the response is not timely enough, and the monitoring of the charging process of the electric automobile is affected.

Disclosure of Invention

In view of the above, embodiments of the present invention provide a method and an apparatus for sampling output of a charging device, so as to solve the problem in the prior art that when the output current and/or voltage of the charging device changes, the response is not timely enough.

In a first aspect of an embodiment of the present invention, there is provided an output sampling method of a charging device, including:

sampling output voltage and/or current of the charging device in real time;

comparing the current sampling value with the current average value; the current average value is an average value of all sampling values currently stored in the data buffer module;

and when the difference value between the current sampling value and the current average value meets a preset condition, the sampling value stored in the data buffer module is emptied to store a new sampling value.

Preferably, the data buffer module comprises a plurality of connected accumulators; the step of emptying the sampling value stored in the data buffer module specifically comprises the following steps:

and all the accumulators in the data buffer module are emptied.

Preferably, when the difference value between the current sampling value and the current average value meets a preset condition, the step of emptying the sampling value stored in the data buffer module specifically includes:

and when the difference value between the current sampling values with the preset number and the corresponding current average value is larger than a threshold value, all the sampling values stored in the data buffer module are emptied.

Preferably, the method further comprises: and when the sampling value stored in the data buffer module is larger than the maximum storage space of the data buffer module, emptying the earliest stored preset number of sampling values in the data buffer module.

Preferably, the data buffer module comprises a plurality of connected accumulators; the emptying of the preset number of sampling values stored earliest by the data buffer module is specifically as follows: clearing the accumulator currently storing the earliest sampling value to store a new sampling value; wherein the earliest sample value is the earliest sample value in time among the sample values stored in the respective accumulators.

In a second aspect of the embodiment of the present invention, there is provided an output sampling device of a charging device, including:

the sampling module is used for sampling the output voltage and/or current of the charging device in real time;

the data buffer module is used for storing the sampling value obtained by the sampling module;

the comparison module is used for comparing the current sampling value with the current average value; the current average value is an average value of all sampling values currently stored in the data buffer module;

and the processing module is used for emptying the sampling value stored in the data buffer module when the difference value between the current sampling value and the current average value meets a preset condition so as to store a new sampling value.

Preferably, the data buffer module comprises a plurality of connected accumulators; the processing module is specifically configured to: and all the accumulators in the data buffer module are emptied.

Preferably, the processing module is specifically configured to: and when the difference value between the current sampling values with the preset number and the corresponding current average value is larger than a threshold value, all the sampling values stored in the data buffer module are emptied.

Preferably, the processing module is further configured to empty a preset number of sampling values stored earliest in the data buffering module when the sampling value is greater than a maximum storage space of the data buffering module.

Preferably, the data buffer module comprises a plurality of connected accumulators; the processing module is specifically configured to: clearing the accumulator currently storing the earliest sampling value to store a new sampling value; wherein the earliest sample value is the earliest sample value in time among the sample values stored in the respective accumulators.

Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the embodiment of the invention, the output voltage and/or current of the charging device is sampled in real time, then the current sampling value is compared with the current average value, and when the difference value between the current sampling value and the current average value meets the preset condition, the sampling value stored in the data buffer module is emptied to store a new sampling value, so that a large amount of storage resources are not consumed continuously, the output of the charging device can be sampled and monitored more quickly, and the quick response to the output of the charging device is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flowchart of an output sampling method of a charging device according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a specific example of an output sampling method of a charging device according to a first embodiment of the present invention;

fig. 3 is a block diagram of an output sampling device of a charging device according to a second embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to illustrate the technical scheme of the invention, the following description is made by specific examples.

Example 1

Fig. 1 shows an implementation flow of an output sampling method of a charging device according to an embodiment of the present invention, which is described in detail below:

step S101, sampling the output voltage and/or current of the charging device in real time.

In this embodiment, the charging device may include a control module, an ac power distribution module, a power distribution module, and an acquisition module. The control module is used for generating a charging control signal. The alternating current power distribution module is used for outputting alternating current according to the charging control signal. The power distribution module is used for converting alternating current output by the alternating current distribution module into multiple paths of direct current according to the charging control signal and adjusting the power of each path of direct current. The acquisition module is used for acquiring alternating current electric signals output by the alternating current distribution module and multipath direct current electric signals output by the power distribution module and feeding back the alternating current electric signals and the multipath direct current electric signals to the control module so that the control module can adjust the charging control signals.

In this step, the output voltage and/or current of the power distribution module in the charging device may be sampled in real time. This step may be implemented by a voltage-current sampler or a voltage-current sampling circuit. For example, the output voltage and/or current of the power distribution module may be sampled by a sampled voltage current sampler. In this embodiment, the sampling time interval is not limited, and may be set according to actual needs. For example, every 1ms, 10ms, 100ms, 1s or 10s, etc. and different charging phases may correspond to different time intervals. Specifically, in the initial stage of charging, the sampling interval may be relatively large; as charging proceeds, the sampling interval may become smaller; at the end of charge, the sampling interval may be set smaller.

Step S102, comparing the current sampling value with the current average value.

The current average value is an average value of all sampling values currently stored in the data buffer module. For example, if the number of sampling values currently stored in the data buffer module is N (N>1) Each sampling value is X (i), i=1, 2, …, N, and the average value of all the sampling values is

The current sampling value is a sampling value X (i) obtained by sampling the output voltage and/or current of the charging device.

In this embodiment, comparing the current sampling value with the current average value may specifically be: the current sampling value X (i) is compared with the current average value

Comparing the magnitudes and calculating the current sampling value X (i) and the current average value

The difference between the two.

As an implementation manner, this step may be implemented by a comparator, but not limited to, comparing the magnitude relation between the current sampling value and the current average value. For example, the comparator may include a voltage comparator and/or a current comparator.

Step S103, when the difference between the current sampling value and the current average value meets a preset condition, the sampling value stored in the data buffer module is emptied, so as to store a new sampling value.

In this embodiment, step S103 may specifically be: and when the difference value between the current sampling values with the preset number and the corresponding current average value is larger than a threshold value, all the sampling values stored in the data buffer module are emptied. This step may be implemented by a microprocessor, but is not limited thereto.

Specifically, when the difference value between the current sampling values with the preset number and the corresponding current average value is larger than the threshold value, it is indicated that the actual output value of the output voltage and/or current of the charging device is changed, and all the sampling values stored in the data buffer module are emptied corresponding to the change of the charging stage, so that the output of the charging device can be sampled and monitored more quickly, and the quick response to the output of the charging device is realized.

It should be noted that, the current average value of the continuous preset number of current sampling values is compared with the corresponding current average value, and the current average value is the average value of all sampling values currently stored in the data buffer module, so that the current average values corresponding to different current sampling values are not the same, but may be relatively close.

For example, when the difference between the current sampling values X (i), X (i+1), … … and X (i+m) and the corresponding current average value is continuously detected to be greater than the threshold value, it is indicated that the actual output value of the output voltage and/or current of the charging device has been changed, and the charging period is changed correspondingly, at this time, all the sampling values stored in the data buffer module are emptied, so that the output of the charging device can be sampled and monitored more quickly, and a quick response to the output of the charging device is realized.

As an alternative, the data buffer module may comprise a plurality of connected accumulators, with each accumulator storing a sample value. Correspondingly, the emptying the sampling value stored in the data buffer module may specifically be: all accumulators in the data buffer module are emptied to store new sample values.

Further, the output sampling method of the charging device according to the embodiment of the present invention may further include: and when the sampling value stored in the data buffer module is larger than the maximum storage space of the data buffer module, emptying the earliest stored preset number of sampling values in the data buffer module.

It can be understood that when the sampling value stored in the data buffer module is greater than the maximum storage space of the data buffer module, it is indicated that no redundant storage space exists in the data buffer module to store a new sampling value, and at this time, the preset number of sampling values stored earliest in the data buffer module can be emptied, so that space is reserved for the new sampling value, and the new sampling value is stored.

As an embodiment, the data buffer module includes a plurality of connected accumulators. Correspondingly, the emptying the preset number of sampling values stored earliest by the data buffer module may specifically be: clearing the accumulator currently storing the earliest sampling value to store a new sampling value; wherein the earliest sample value is the earliest sample value in time among the sample values stored in the respective accumulators.

Specifically, the data buffering module includes three connected accumulators A1, A2 and A3, each accumulator being capable of storing X sample values. The three accumulators store the sample values in the order: firstly, storing a sampling value by an accumulator A1; when the accumulated value of the number of the sampling values is larger than X, the accumulator A1 does not have space for storing new sampling values, and the accumulator A2 stores the new sampling values; when the number of the sampling values is larger than 2X, the accumulator A2 does not have a space to store a new sampling value, and the accumulator A3 stores the new sampling value. Correspondingly, when the accumulated value of the number of the sampling values is larger than 3X, the three accumulators do not have space for storing new sampling values, and as the sampling values stored in the accumulator A1 are relatively earliest, the sampling values stored in the accumulator A1 are emptied, and then the new sampling values are stored, so that the current average value is calculated by the newer sampling values; when the accumulated value of the number of the sampling values is larger than 4X, the sampling values stored in the accumulator A2 are emptied, and then new sampling values are stored; when the accumulated value of the number of the sampling values is larger than 5X, the sampling values stored in the accumulator A3 are emptied, and then new sampling values are stored; and so on according to the above procedure.

Referring to fig. 2, a method for sampling an output of a charging device according to an embodiment of the present invention is further described below by taking a data buffer module including three connected accumulators A1, A2, and A3 as an example. The number of sampling values that each accumulator can store is 10000, but not limited to this.

Firstly, sampling the output voltage and/or current of a charging device by a sampling device, and then sending the sampled value to a monitor; the monitor compares the current sampling value with the current average value, and empties the sampling values stored in the accumulator A1, the accumulator A2 and the accumulator A3 when the absolute values of the differences between a plurality of continuous current sampling values and the corresponding current average values are all larger than a threshold value; accumulator A1, accumulator A2 and accumulator A3 store new sample values in sequence.

Specifically, when the accumulated number of sampling values is less than 10000, the accumulator A1 stores the sampling values; when the accumulated value of the number of the sampling values is larger than 10000, the accumulator A1 does not have space for storing new sampling values, and the accumulator A2 stores the new sampling values; when the number of the sampling values is larger than 20000, the accumulator A2 does not have space to store new sampling values, and the accumulator A3 stores new sampling values.

Correspondingly, when the accumulated value of the number of the sampling values is greater than 30000, the three accumulators do not have space for storing new sampling values, and as the sampling values stored in the accumulator A1 are relatively earliest, the sampling values stored in the accumulator A1 are emptied, and then the new sampling values are stored, so that the current average value is calculated from the newer sampling values; when the accumulated value of the number of the sampling values is greater than 40000, the sampling values stored in the accumulator A2 are emptied, and then new sampling values are stored; when the accumulated value of the number of the sampling values is more than 50000, the sampling values stored in the accumulator A3 are emptied, and then new sampling values are stored; and so on according to the above procedure.

In the present embodiment of the present invention,

(1) When i>30000, let i=20001, empty accumulator A1,

i.e. to cause accumulator A1 to store a new sample value;

(2) Again i>30000, let i=20001, empty accumulator A2,

i.e. to cause accumulator A2 to store the new sample value;

(3) Again i>30000, let i=20001, empty accumulator A3,

i.e. to cause accumulator A3 to store a new sample value;

(4) And (3) repeating (1) when i >30000 is performed again.

The average value of the filter output is

Where i is the number of times the sample values are actually accumulated.

According to the output sampling method of the charging device, the output voltage and/or the current of the charging device are sampled in real time, then the current sampling value is compared with the current average value, and when the difference value between the current sampling value and the current average value meets the preset condition, the sampling value stored in the data buffer module is emptied to store a new sampling value, a large amount of storage resources are not consumed continuously, so that the output of the charging device can be sampled and monitored more quickly, and the quick response to the output of the charging device is realized.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.

Example two

Corresponding to the output sampling method of the charging device described in the above embodiments, fig. 3 shows a block diagram of the output sampling device of the charging device according to the embodiment of the present invention. For convenience of explanation, only the portions related to the present embodiment are shown.

Referring to fig. 3, the apparatus includes a sampling module 101, a data buffering module 102, a comparing module 103, and a processing module 104.

Specifically, the sampling module 101 is configured to sample, in real time, an output voltage and/or current of the charging device.

And the data buffer module 102 is used for storing the sampling value obtained by the sampling module.

A comparing module 103, configured to compare the current sampling value with the current average value. Wherein the current average value is an average value of all sampling values currently stored in the data buffer module 102.

And the processing module 104 is configured to empty the sampling value stored in the data buffering module when the difference value between the current sampling value and the current average value meets a preset condition, so as to store a new sampling value.

Optionally, the data buffer module 102 includes a plurality of connected accumulators. The processing module 104 is specifically configured to: the respective accumulators in the data buffer module 102 are all emptied.

Optionally, the processing module 104 is specifically configured to: and when the difference value between the current sampling values with the preset number and the corresponding current average value is larger than a threshold value, all the sampling values stored in the data buffer module 102 are emptied.

Further, the processing module 104 is further configured to empty the preset number of sampling values stored earliest in the data buffering module 102 when the sampling values are greater than the maximum storage space of the data buffering module 102.

Optionally, the data buffer module 102 includes a plurality of connected accumulators. The processing module 104 is specifically configured to: clearing the accumulator currently storing the earliest sampling value to store a new sampling value; wherein the earliest sample value is the earliest sample value in time among the sample values stored in the respective accumulators.

According to the output sampling device of the charging device, the output voltage and/or the current of the charging device are sampled in real time, then the current sampling value is compared with the current average value, and when the difference value between the current sampling value and the current average value meets the preset condition, the sampling value stored in the data buffer module is emptied to store a new sampling value, a large amount of storage resources are not consumed continuously, so that the output of the charging device can be sampled and monitored more quickly, and the quick response to the output of the charging device is realized.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the system embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. An output sampling method of a charging device, comprising:

sampling output voltage and/or current of the charging device in real time;

when the difference value between the current sampling value and the current average value meets a preset condition, the sampling value stored in the data buffer module is emptied to store a new sampling value;

when the difference value between the current sampling value and the current average value meets a preset condition, the step of emptying the sampling value stored in the data buffer module specifically comprises the following steps:

and when the absolute values of the differences between the current sampling values with the preset numbers and the corresponding current average values are larger than a threshold value, all the sampling values stored in the data buffer module are emptied.

2. The method of claim 1, wherein the data buffer module comprises a plurality of connected accumulators; the step of emptying the sampling value stored in the data buffer module specifically comprises the following steps:

and all the accumulators in the data buffer module are emptied.

3. The output sampling method of a charging device according to claim 1, further comprising: and when the sampling value stored in the data buffer module is larger than the maximum storage space of the data buffer module, emptying the earliest stored preset number of sampling values in the data buffer module.

4. The method of claim 3, wherein the data buffer module comprises a plurality of connected accumulators; the emptying of the preset number of sampling values stored earliest in the data buffer module is specifically: clearing the accumulator currently storing the earliest sampling value to store a new sampling value; wherein the earliest sample value is the earliest sample value in time among the sample values stored in the respective accumulators.

5. An output sampling device of a charging device, comprising:

the processing module is used for emptying the sampling value stored in the data buffer module when the difference value between the current sampling value and the current average value meets a preset condition so as to store a new sampling value;

the processing module is specifically configured to: and when the absolute values of the differences between the current sampling values with the preset numbers and the corresponding current average values are larger than a threshold value, all the sampling values stored in the data buffer module are emptied.

6. The output sampling device of a charging device of claim 5, wherein the data buffer module comprises a plurality of connected accumulators; the processing module is specifically configured to: and all the accumulators in the data buffer module are emptied.

7. The output sampling device of claim 6, wherein the processing module is further configured to empty a preset number of sample values stored earliest in the data buffer module when the sample value is greater than a maximum storage space of the data buffer module.

8. The output sampling device of a charging device of claim 7, wherein the data buffer module comprises a plurality of connected accumulators; the processing module is specifically configured to: clearing the accumulator currently storing the earliest sampling value to store a new sampling value; wherein the earliest sample value is the earliest sample value in time among the sample values stored in the respective accumulators.