CN111610359A - Filtering method for controlling voltage acquisition of guide circuit by charging pile - Google Patents
Filtering method for controlling voltage acquisition of guide circuit by charging pile Download PDFInfo
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Abstract
The invention provides a filtering method for controlling voltage acquisition of a guide circuit by a charging pile, which can reduce waveform burrs output by the charging pile, resist external environment interference and improve the accuracy of voltage acquisition, and comprises the following implementation steps: the method comprises the steps of outputting PWM waves by a charging pile and determining the period of the PWM waves, wherein the period of a high level area is T1, the period of a low level area is T2, the total period of the PWM waves is T3, a plurality of voltage acquisition points which are uniformly arranged at intervals are determined, reference acquisition points are arranged on the voltage acquisition points, the reference acquisition points are determined by timer interruption and instruction delay T4, the time interval between every two adjacent voltage acquisition points is T5, T5 is determined by instruction delay, the voltage acquisition points are located in the high level area, the AD values of the voltage acquisition points are acquired, the AD average value is calculated, digital filtering is carried out on the AD average value through an algorithm of a sliding array, the converted AD value is obtained, state conversion is carried out, and the converted AD value is converted into the actual voltage value of a charging pile charging control guide circuit.
Description
Technical Field
The invention relates to the technical field of charging piles, in particular to a filtering method for controlling voltage acquisition of a guide circuit by a charging pile.
Background
The state conversion of the control and guide circuit of the alternating-current charging pile is the core of the charging control time sequence of the alternating-current charging pile, the state conversion of the control and guide circuit of the alternating-current charging pile mainly comprises an original control and guide circuit, a negative power supply generation circuit, a PWM output circuit, a feedback circuit and the like, the charging pile is connected with a vehicle-mounted charger of an electric vehicle through a charging gun, before the charging pile is put into use, digital quantity information of the charging pile control and guide circuit of the charging pile needs to be acquired through an existing ADC sampling circuit, namely, the AD value of the charging gun of the charging pile and the control and connection line of the vehicle-mounted charger in the charging process is acquired, so that the charging pile control and guide circuit meets the requirements of.
At present, the voltage acquisition of a charging pile is realized mainly based on a mode of acquiring data by an ADC (analog-to-digital converter) sampling circuit and converting the acquired data into corresponding voltage, the mode of acquiring the voltage of the charging pile in the prior art is a random point acquisition method, the filtering method of voltage acquisition is an average value acquisition method, when the output voltage of the charging pile is PWM (pulse-width modulation) wave in the charging process, a plurality of time points are randomly searched as acquisition points for voltage acquisition, the average value of the acquired voltage is calculated, and the acquired average value is used as the voltage value acquired by the charging pile. Compared with the actual measurement value, the numerical value obtained by the voltage acquisition mode has larger error, and the reason is that: due to electromagnetic interference of other circuits, a PWM waveform output by the charging pile is unstable, burrs and other interference waveforms exist at the initial stage of waveform change, and the like, a voltage acquisition point selected by the existing method may be an invalid point, namely, the voltage acquisition point is positioned in a low-voltage area, the burrs or other interference waveforms and other areas in the PWM waveform, so that the problem of inaccurate output voltage acquisition is easily caused, the error of the charging pile is further increased when the charging pile is subjected to the environmental electromagnetic interference, and a series of faults such as charging interruption, incapability of initiating charging, failure and the like in the use process of the charging pile can be caused.
Disclosure of Invention
Aiming at the problem that poor voltage acquisition accuracy is easily caused by randomly selecting voltage acquisition points and adopting an average value as a filtering method for voltage acquisition in the prior art, the invention provides the filtering method for controlling and guiding circuit voltage acquisition by the charging pile, which can effectively reduce the waveform burrs output by the charging pile and the interference of an external environment on CP voltage acquisition and can improve the accuracy of voltage acquisition.
A filtering method for controlling and guiding circuit voltage acquisition by a charging pile comprises the following implementation steps:
the method comprises the following steps: the charging pile outputs PWM waves;
step two: determining the period of the PWM wave, wherein the period of a high level region is T1, the period of a low level region is T2, and the total period is T3;
it is characterized by also comprising the following third step: determining voltage acquisition points, wherein the voltage acquisition points comprise reference acquisition points, the reference acquisition points are determined by timer interruption and command delay T4, the time delay between two adjacent voltage acquisition points is T5, the T5 is determined by command delay, and the voltage acquisition points are located in the high level region;
step four: collecting the AD value of each voltage collection point, and calculating the average value of AD;
step five: performing digital filtering in a sliding array mode to obtain a conversion AD value;
step six: and state conversion, namely converting the converted AD value into an actual voltage value of the charging control guide circuit of the charging pile, and judging the connection state between a charging gun of the charging pile and a vehicle-mounted charger of the electric automobile, which is specified by national standards.
It is further characterized in that:
in the first step, a pin of the charging pile is controlled through an MCU controller with a PWM function, and the PWM wave is output, wherein the pin is a PWM pin;
in the second step, the period of the PWM wave is controlled by the PWM pin drive, and the output frequency of the PWM pin is set to be 1 kHZ;
preferably, in the second step, according to the regulations of national standards on output power of the charging pile, taking a charging pile with 7Kw power as an example, the total period T3 of each PWM wave is 1000us, the period T1 of the high level region is 532us, the period T2 of the low level region is 468us, and the AD values of the voltage acquisition points in the period T1 of the high level region are acquired;
in the third step, the timer interrupt time is used as the starting point of the delay T4, the interrupt time is the starting point of the high level region, a first voltage acquisition point is found through the delay T4, the first voltage acquisition point is the reference acquisition point C1, the time delay T5 between two adjacent voltage acquisition points is set in sequence through instruction delay, the delay T4 is 50 us-150 us, and the time delay T5 between two adjacent voltage acquisition points is 30 us-60 us;
preferably, in the third step, the number of the voltage collecting points is M, M is a positive integer greater than or equal to 5, and each M is C1、C2…CM-1、CMThe time interval from the voltage acquisition point CM to the end time of the high level region is T6, and the waveform in T6 is discarded and not acquired;
the T6 is 132 us;
in the fourth step, the average value of the voltage values of the M voltage acquisition points is taken as the voltage average value of the PWM wave, and the calculation formula is as follows:
ADm＝(AD(1)+…+AD(M))/M，
wherein ADm is the average value of AD of one PWM wave, and AD (1) … AD (M) is the AD value corresponding to each voltage acquisition point C1 … CM;
step five, every N average values are put into an array, N is a positive integer greater than or equal to 2, and the AD average value ADm calculated in the step four is put into the array with the array member number N being 60;
preferably, in step five, the average value of the N members in the array is taken as the converted AD value, and the calculation formula is: ADn ═ ADm (1) + … + ADm (N))/N, where ADn denotes the converted AD value, and ADm (1) … ADm (N) is the AD average value ADm of the PWM wave for each of the N members in an array;
and sixthly, calculating an actual voltage value of the charging pile according to the transformation ratio of the peripheral circuit, wherein the actual voltages of the charging pile charging control guide circuit specified by the national standard are 12V, 9V and 6V, and the 12V, 9V and 6V respectively correspond to the vehicle gun state 'unconnected state', 'connected state' and 'charging state' of the charging pile one by one.
By adopting the structure of the invention, the following beneficial effects can be achieved: (1) the method can specifically find an accurate acquisition period instead of randomly searching for acquisition points, so that invalid acquisition points are effectively removed, and the voltage acquisition speed and accuracy are improved;
(2) the voltage acquisition point acquired by the method is positioned in the middle section of the PWM wave high-level area, the waveform of the PWM wave in the middle section is more stable, and the acquired AD value is more accurate because the time delay T4 is arranged in front of the reference acquisition point, so that the influence of burrs and other interference waveforms existing in the PWM wave at the initial stage of high and low voltage change can be effectively avoided, the more stable waveform can be effectively found, and the voltage acquisition speed and accuracy are also improved.
Drawings
FIG. 1 is a schematic diagram of voltage acquisition points of a PWM wave of the present invention;
FIG. 2 is a flow chart of the steps of the present invention.
Detailed Description
Referring to fig. 1 and 2, a filtering method for controlling voltage acquisition of a pilot circuit by a charging pile includes the following implementation steps:
the method comprises the following steps: controlling pins of the charging pile through an MCU controller with a PWM function, and enabling the charging pile to output PWM waves, wherein the pins are PWM pins;
step two: the period of a PWM wave is controlled through PWM pin driving, the output frequency of the PWM pin is set to be 1kHZ, the period of the PWM wave comprises a high-level area and a low-level area, wherein the period of the high-level area is T1, the period of the low-level area is T2, the total period is T3, each waveform period T3 is 1000us according to national standard, a charging pile with 7Kw power is taken as an example, the period T1:532us of the high-level area is as well as the period T2 of the low-level area: 468 us;
step three: determining a reference collecting point through the interruption time of the PWM timer and the instruction delay, and determining each voltage collecting point through setting delays T4 and T5 through the instruction delay, wherein each voltage collecting point is located in a high level area, as shown in FIG. 1, the specific steps are as follows:
a) the execution place of the interrupt function is determined as the place where the high level waveform of the PWM wave starts;
b) through instruction delay T4: 100us (alternatively 50-150us, with a typical value of 100us) to determine the reference collection point for collection, i.e., the collection point for the first voltage collection point voltage value AD (1), as shown at "C1" in FIG. 1.
Step four: the method comprises the following steps of selecting M high-level calculation average values from waveforms of a middle part at the beginning time of a reference acquisition point, selecting waveforms of the middle part at the beginning time of the reference acquisition point 'C1' for acquisition, wherein the waveforms of the middle part are most stable and accurate, burrs and interference easily occur on the parts with high-level and low-level waveform changes, and the method specifically comprises the following steps:
a) calculating the high level period T1 of the PWM square wave to be 532us according to 1 kHz;
b) removing the unstable waveform part of the first 100us from which the waveform change starts by a delay T4-100 us;
c) in the embodiment, 7 voltage acquisition points in the PWM wave are selected for voltage acquisition, that is, M is 7 (the voltage acquisition points have more data and the acquired AD average value is closer to the actual value) from the voltage acquisition points "C1" to "C7", the time interval between two adjacent voltage acquisition points is determined by the command delay T5:50us (30-60 us can be selected, and the typical value is 50us),
d) the time interval after the last voltage collection point C7 to the end of the high region is T6: 132us, because the following high level is about to change to low level, the waveform in the high level region at this time interval T6 is unstable and susceptible to interference, and therefore, the waveform in T6 is discarded and not collected.
e) Taking the average value of the AD value data of the 7 voltage acquisition points as an AD average value ADm in a PWM waveform:
ADm (AD (1) + … + AD (M))/M, where ADm is the AD average value ADm in one PWM waveform, and AD (1) … AD (M) is the AD value corresponding to each voltage acquisition point C1 … CM;
step five: digital filtering is carried out in a sliding array mode to obtain a conversion AD value, and the method specifically comprises the following steps:
a) and putting every N average values into an array, wherein N is a positive integer larger than or equal to 2, and putting the AD average value ADm in each PWM waveform calculated in the fourth step into an array with the array member number N being 60 (the CP fault is detected within 100ms and 60 members can be filled in each waveform period of 1ms specified by the national standard).
b) After the array is full, continuing to store from the beginning, and circularly storing without emptying;
c) taking the average of the N members of the array as the conversion AD value: ADn ═ AD (1) + … + AD (N))/N, where ADn denotes the converted AD value, and ADm (1) … ADm (N) is the AD average value ADm of the PWM waves corresponding to each of the N members of an array;
d) and taking the AD average value of the latest N members each time as the basis of the current voltage conversion.
Step six: state transition for judge the car rifle state of the electric pile that fills of national standard regulation, concrete step includes:
a) convert the AD value into the actual voltage value of filling electric pile, calculate the actual voltage who fills electric pile charge control guide circuit according to peripheral circuit's transformation ratio, peripheral circuit is the ADC sampling circuit who is used for filling electric pile charge control guide circuit voltage collection, ADC sampling circuit is connected with the digital quantity input of MCU controller, the transformation ratio of conversion AD value and the actual voltage value of filling electric pile charge control guide circuit output is 1: 6.
b) the voltage ranges of 12V, 9V and 6V are regulated by national standards to be converted into the connection state of the charging gun and the vehicle-mounted charger of the electric automobile: 12V, 9V, and 6V correspond to the "unconnected state", "connected state", and "charged state" one to one, respectively.
Before the charging pile is put into use, a type test needs to be carried out on the charging pile, so that the method can be applied to the type test, and the type test is as follows: EMC tests on GBTs 18487.2-2017 on off-board conductive power supply equipment electromagnetic compatibility requirements and CQC tests on GBTs 18487.1-2015 on charging timing in electric vehicle conductive charging systems. By adopting the filtering method for collecting the voltage of the charging pile control guide circuit in the embodiment, and after the converted AD value is converted into the CP voltage of the charging pile (the CP voltage of the charging pile is the voltage of the charging pile control guide circuit), the obtained CP voltage value can fall into the voltage ranges of 12V, 9V and 6V specified by the national standard, and the error of +0.8V to-0.8V is allowed from top to bottom, and the obtained CP voltage value is basically consistent with the voltage value detected by using an oscilloscope in the actual situation, the CP voltage value obtained by the existing random point-taking mode (for example, in the prior art, voltage acquisition is carried out every 700 microseconds, and some voltage acquisition points fall into a low-level region, an initial section or an ending section of a high-level region) exceeds the voltage range of 12V, 9V and 6V specified by the national standard, therefore, the method can meet the requirement of accurate acquisition of the CP voltage of the charging pile.
The above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.
Claims (8)
1. A filtering method for controlling and guiding circuit voltage acquisition by a charging pile comprises the following implementation steps:
the charging pile outputs PWM waves;
determining the period of the PWM wave, wherein the period of a high level region is T1, the period of a low level region is T2, and the total period of the PWM wave is T3;
the method is characterized in that a plurality of voltage acquisition points which are uniformly arranged at intervals are determined, reference acquisition points are arranged on the voltage acquisition points, the reference acquisition points are determined through timer interruption and instruction delay T4, the time interval between every two adjacent voltage acquisition points is T5, T5 is determined through instruction delay, and the voltage acquisition points are located in the high level region;
collecting the AD value of the voltage collection point, and calculating an AD average value;
performing digital filtering on the AD average value through an algorithm of a sliding array to obtain a conversion AD value;
and state conversion, namely converting the AD value into an actual voltage value of the charging control guide circuit of the charging pile.
2. The filtering method for the voltage acquisition of the charging pile control pilot circuit according to claim 1, characterized in that: controlling the PWM pin of the charging pile to output the PWM wave through an MCU controller with a PWM function, wherein the MCU controller comprises a timer, and the T1 and the T2 are determined through the timer.
3. The filtering method for the voltage acquisition of the charging pile control pilot circuit according to claim 2, characterized in that: the period of the PWM wave is controlled by the PWM pin, and the output frequency of the PWM pin is set to be 1 kHZ.
4. The filtering method for the voltage acquisition of the charging pile control pilot circuit according to any one of claims 3, wherein the filtering method comprises the following steps: the T3 is 1000us, the T1 is 532us, and the T2 is 468 us.
5. The filtering method for the voltage acquisition of the charging pile control pilot circuit according to claim 4, wherein the filtering method comprises the following steps: taking the time of the timer interruption as the starting point of the time delay T4, finding a first voltage acquisition point through the time delay T4, wherein the first voltage acquisition point is the reference acquisition point, and sequentially setting the time delay T5 between two adjacent voltage acquisition points through the instruction time delay, wherein the time delay T4 is 50-150us, and the time delay T5 is 30-60 us.
6. The filtering method for the voltage acquisition of the charging pile control pilot circuit according to claim 5, wherein the filtering method comprises the following steps: the number of the voltage acquisition points is greater than or equal to 5, and the time interval from the last voltage acquisition point to the end time of the high-level region in each period is T6.
7. The filtering method for the voltage acquisition of the charging pile control pilot circuit according to claim 6, wherein the filtering method comprises the following steps: and taking the AD average value of the M voltage acquisition points as the AD average value of the PWM wave.
8. The filtering method for the voltage acquisition of the charging pile control pilot circuit according to claim 7, characterized in that: and converting the converted AD value into an actual voltage value of the charging pile specified by the national standard according to the transformation ratio of the peripheral circuit, wherein the actual voltage value of the charging pile is 12V, 9V or 6V.
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| CN113655268A (en) * | 2021-08-10 | 2021-11-16 | 宁波均联智行科技股份有限公司 | Voltage detection method and device for charging pile CP signal |
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