CN115932390A - High-precision digital measurement method and measurement system for battery pulse charging - Google Patents
High-precision digital measurement method and measurement system for battery pulse charging Download PDFInfo
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Abstract
The invention discloses a high-precision digital measurement method and a measurement system for battery pulse charging, which belong to the technical field of pulse charging and comprise the following steps: s1, generating a fixed sampling clock signal and an adjustable sampling clock signal by using a frequency generator according to pulse charging time; s2, detecting and storing a phase difference value between the adjustable sampling clock signal and the fixed sampling clock signal; s3, solving and storing a difference value between sampling values; s4, solving a voltage deviation value, and deducing a phase difference corresponding to the voltage deviation value; and S5, comparing the sampled digital voltage value with the set lowest value of the battery voltage, if the voltage values are equal, determining that the integral number of cycle time of the sampling clock signal corresponding to the digital voltage value is the charging stop time, and if the voltage values are not equal, increasing the phase difference on the basis of fixing the integral number of cycle time of the sampling clock signal to be the charging stop time, so as to measure the duty ratio of pulse charging.
Description
Technical Field
The invention belongs to the technical field of pulse charging, and particularly relates to a high-precision digital measurement method and a measurement system for pulse charging of a battery.
Background
As is known, the pulse charging method breaks through the limitation of the traditional optimal charging current curve on battery charging, and in the pulse charging stage, the high-current pulse enables the voltage of the battery to rise rapidly, while the stop charging period increases the buffering time of the chemical reaction in the battery, eliminates the concentration polarization of the battery, and enables the following pulse charging to be smoother. The voltage of the battery rises rapidly during pulse charging, and after the set charging time is over, the voltage gradually drops, and when the voltage drops to the set voltage, the next pulse charging starts. The charging stop time is gradually prolonged along with the pulse charging, the duty ratio of the charging pulse is continuously reduced, and when the duty ratio reaches a specified value, the battery is considered to be fully charged.
The traditional method for controlling the stop of charging in pulse charging is measured according to the change situation of the duty ratio of the pulse charging. As the charging progresses, the charging stop time becomes longer, and when the duty ratio falls within a certain range, the battery is considered to be fully charged, and the charging is stopped. The duty cycle is calculated as:
in the formula, T 1 For a pulse charging time, and T 1 For controlling system set-point, charging-off time T 2 To change the value, each stop-off time and the measurement of the stop-off time are the key of the battery pulse charging method.
Obviously: in the common pulse charging process, the stable phase change characteristic of a clock sampling signal in the digital sampling of the battery voltage and the relation between a voltage digital change value and a phase difference change value are not fully utilized, so that the measurement precision of the stop-start moment and the stop-start time cannot be further improved.
Disclosure of Invention
In order to overcome the technical defects, the invention provides a high-precision digital measurement method and a measurement system for battery pulse charging, which utilize the periodic change of the phase difference between two sampling clock signals and the periodic change of the voltage difference between voltage sampling values to digitally derive the phase difference and the small frequency difference between the two sampling clock signals so as to complete the sampling of the lowest value of the battery voltage and the measurement of the pulse charging duty ratio with high precision, and utilize the periodic change characteristics of the phase difference and the voltage difference to carry out the voltage sampling and the measurement of the pulse charging duty ratio.
In order to achieve the technical purpose, the invention is realized by the following technical scheme:
the first purpose of the invention is to provide a high-precision digital measurement method for battery pulse charging, which comprises the following steps:
the method comprises the following steps of S1, generating a fixed sampling clock signal and an adjustable sampling clock signal by using a frequency generator according to pulse charging time, wherein the pulse charging time comprises an integer number of periods of the fixed sampling clock signal; wherein: frequency f of the fixed sampling clock signal 1 Is equal to f 0 +Δ 1 (ii) a Frequency f of the adjustable sampling clock signal 2 Is equal to f 0 +Δ 2 ；f 0 Is the nominal value of the frequency; delta of 1 And Δ 2 Is a frequency deviation, and the two are not equal;
s2, detecting and storing a phase difference value between the adjustable sampling clock signal and the fixed sampling clock signal;
s3, respectively carrying out digital sampling on the voltage in the stop charging period by using the adjustable sampling clock signal and the fixed sampling clock signal, solving and storing the difference value between the sampling values, wherein each difference value corresponds to the phase difference between the adjustable sampling clock signal and the fixed sampling clock signal;
s4, utilizing a fixed sampling clockComparing the digital voltage value sampled by the signal with the set lowest voltage value in the charge stop period to obtain a voltage deviation value delta u min And deducing a voltage deviation value delta u according to the corresponding relation between the phase difference and the voltage difference value min Corresponding phase difference Δ t min ；
S5, comparing the digital voltage value respectively sampled by the fixed sampling clock signal and the adjustable sampling clock signal with the set lowest value of the battery voltage, if the voltage values are equal, the integral number of the period time of the sampling clock signal corresponding to the digital voltage value is the charging stop time, and if the voltage values are not equal, the phase difference delta t is increased on the basis of the integral number of the period time of the fixed sampling clock signal min And as the charging stopping time, further measuring the duty ratio of pulse charging.
A second object of the present invention is to provide a high-precision digital measurement system for battery pulse charging, comprising:
a frequency generator for generating a fixed sampling clock signal and an adjustable sampling clock signal; the pulse charging time comprises an integer number of periods of a fixed sampling clock signal; wherein: frequency f of the fixed sampling clock signal 1 Is equal to f 0 +Δ 1 (ii) a Frequency f of the adjustable sampling clock signal 2 Is equal to f 0 +Δ 2 ；f 0 Is the nominal value of the frequency; delta 1 And Δ 2 Is a frequency deviation, and the two are not equal;
a computer for controlling the working state of the frequency generator;
the first analog-to-digital converter is used for digitally sampling the battery voltage in the charge stop period at a fixed sampling clock signal frequency;
the second analog-to-digital converter is used for digitally sampling the battery voltage in the charge stop period at the adjustable sampling clock signal frequency;
the voltage deviation value calculation module is used for comparing the sampling signal of the first analog-to-digital converter with the set voltage lowest value;
the phase difference detection module between the sampling clock signals is used for detecting the phase difference between the fixed sampling clock signal and the adjustable sampling clock signal;
the voltage difference module between the voltage sampling values is used for comparing the voltage sampling values of the first analog-to-digital converter and the second analog-to-digital converter;
the storage periodic data module is used for receiving and storing output information of the voltage difference module between the voltage sampling values and the phase difference detection module between the sampling clock signals;
the phase difference deducing module is used for receiving and analyzing the data of the voltage difference module between the voltage sampling values and the periodic data storage module;
and the duty ratio metering module is used for receiving the data of the derivation phase difference module, the fixed sampling clock signal and the adjustable sampling clock signal and metering the duty ratio according to the data.
The invention has the advantages and the technical effects that:
the invention utilizes the phase difference characteristics of high resolution and periodic change between the fixed sampling clock signal and the adjustable sampling clock signal to carry out high-precision sampling on the voltage in the stop-charge period, and then utilizes the sampled voltage digital value to deduce the phase difference, thereby determining the stop-charge stop time with high precision, further solving the stop-charge time and calculating the duty ratio.
The phase difference compensation device has a simple structure, is easy to realize, utilizes the same frequency nominal value between the fixed sampling clock signal and the adjustable sampling clock signal and has a micro frequency deviation relation to generate a stable and periodically-changed phase difference, measures the voltage in the charging stop period with high resolution, captures the ending moment of the charging stop period with high precision, and digitally compensates the phase difference on the basis of the whole period number of the sampling clock signals.
Drawings
FIG. 1 is a schematic diagram of dual clock sampling of battery off-charge period voltage in a preferred embodiment of the present invention;
fig. 2 is a system block diagram of a preferred embodiment of the present invention.
Detailed Description
In order to make the above objects, control systems and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention utilizes two sampling clock signals to carry out digital sampling on the battery voltage, the sampling clock signals have the same frequency nominal value and the relationship with small frequency difference, and a high-resolution phase difference and a corresponding digital voltage difference variable quantity can be generated at the moment. The invention has high measurement precision, simple circuit structure and easy realization, and solves the problems of low measurement precision of the stop and charge stop time in the stop and charge period, which causes low stop and charge control precision and low pulse duty ratio measurement precision in the background technology.
Referring to fig. 1 and 2, a method for high-precision digital measurement of battery pulse charging includes:
(1) and generating a fixed sampling clock signal and an adjustable sampling clock signal by using a frequency generator according to the pulse charging time, wherein the pulse charging time comprises an integer number of cycles of the fixed sampling clock signal, and the adjustable sampling clock signal and the fixed sampling clock signal have the same frequency nominal value and have small frequency deviation.
In the pulse charging method, when the duty ratio is calculated, the charging time of the pulse is set by a computer, and the frequency of the fixed sampling clock signal can be determined based on the charging time of the pulse.
(2) And detecting and storing the phase difference value of the high-resolution stable change between the adjustable sampling clock signal and the fixed sampling clock signal.
The invention relates to a high-precision digital measurement system, which aims at ensuring that an adjustable sampling clock signal and a fixed sampling clock signal have the same frequency nominal value and have small frequency deviation in the measurement process, under the condition, the phase difference between two pulse signals is stably and periodically changed in the battery charging and discharging period, and the charging and discharging cut-off time and the high-precision measurement charging and discharging time can be accurately controlled by changing the small frequency deviation value.
For a simple example, as shown in FIG. 1, with adjustable samplingThe rising edges of the clock signal and the fixed sampling clock signal are the comparison time of the phase difference, assume a 0 、b 0 The phase coincidence means that the phase difference is 0, and at the initial time, the phase difference between the two signals is 0, Δ t 1 ，Δt 2 ，Δt 3 The phases of the two signals coincide again, and the change in phase difference is again 0, Δ t 1 ，Δt 2 ，Δt 3 The phase difference of the two signals presents monotonous and periodic variation characteristics under the condition that the same frequency nominal value exists between the adjustable sampling clock signal and the fixed sampling clock signal has small frequency deviation, and a technical basis is provided for accurately controlling the stop-off moment of the charging and accurately measuring the charging and stopping time. The smaller the frequency deviation is, the higher the resolution of the phase difference change is, and the resolution control is realized through the control of the adjustable sampling clock signal.
(3) The analog-digital converter respectively carries out digital sampling on the voltage in the stop charging period by utilizing the adjustable sampling clock signal and the fixed sampling clock signal, the difference value between the sampling values is obtained and stored, and each difference value corresponds to the phase difference between the adjustable sampling clock signal and the fixed sampling clock signal.
As shown in fig. 1, when the voltages in the stop-and-fill period are sampled at the sampling time of the adjustable sampling clock signal and the fixed sampling clock signal, respectively, the phase difference Δ t between the two signals is obtained 1 、Δt 2 、Δt 3 Respectively corresponding to the sampling voltage difference value Deltau 1 、Δu 2 、Δu 3 。
(4) Comparing the digital voltage value sampled by the fixed sampling clock signal with the set lowest voltage value in the charge stop period, namely obtaining the voltage deviation value delta u min And deducing delta u according to the corresponding relation between the phase difference and the voltage difference min Corresponding phase difference Δ t min 。
(5) Comparing the digital voltage value sampled by the fixed sampling clock signal and the adjustable sampling clock signal with the set lowest value of the battery voltage, if the voltage values are equal, the integral number of the period time of the sampling clock signal corresponding to the digital voltage value is the charging stop time, if the voltage value is not equal to the set lowest value of the battery voltage, the charging stop time is the integral number of the period time of the sampling clock signal corresponding to the digital voltage value, and if the voltage value is not equal to the set lowest value of the battery voltage, the charging stop time is the integral number of the period time of the sampling clock signal corresponding to the digital voltage valueIn case of equality, the phase difference Δ t is increased on the basis of a fixed sampling clock signal for an integer number of cycle times min And measuring the duty ratio of pulse charging as the charging stopping time.
Because the lowest value of the battery voltage cannot be sampled when the fixed sampling clock signal is used for sampling the voltage in the charge stop period, the sampling time of the fixed sampling clock signal cannot be used as the stop time of the charge stop period, the charge stop time cannot be determined with high precision by measuring the number of cycles of the fixed sampling clock signal, and the phase difference deltat needs to be increased on the basis of the whole number of cycles of the fixed sampling clock signal min 。
A high accuracy digital measurement system for pulse charging of a battery, comprising:
a frequency generator for generating a fixed sampling clock signal and an adjustable sampling clock signal; the pulse charging time comprises an integer number of periods of a fixed sampling clock signal; wherein: frequency f of the fixed sampling clock signal 1 Is equal to f 0 +Δ 1 (ii) a Frequency f of the adjustable sampling clock signal 2 Is equal to f 0 +Δ 2 ；f 0 Is the nominal value of the frequency; delta 1 And Δ 2 Is the frequency deviation, and the two are not equal;
a computer for controlling the working state of the frequency generator;
the first analog-to-digital converter is used for digitally sampling the battery voltage in the charge stop period at a fixed sampling clock signal frequency;
the second analog-to-digital converter is used for digitally sampling the battery voltage in the charge stop period at the adjustable sampling clock signal frequency;
the voltage deviation value calculation module is used for comparing the sampling signal of the first analog-to-digital converter with the set voltage lowest value;
the phase difference detection module between the sampling clock signals is used for detecting the phase difference between the fixed sampling clock signals and the adjustable sampling clock signals;
the voltage difference module between the voltage sampling values is used for comparing the voltage sampling values of the first analog-to-digital converter and the second analog-to-digital converter;
the storage periodic data module is used for receiving and storing the output information of the voltage difference module between the voltage sampling values and the phase difference detection module between the sampling clock signals;
the phase difference derivation module is used for receiving and analyzing data of the voltage difference module between the voltage sampling values and the periodic data storage module;
and the duty ratio metering module is used for receiving the data of the derivation phase difference module, the fixed sampling clock signal and the adjustable sampling clock signal and metering the duty ratio according to the data.
In the high-precision digital measurement system for battery pulse charging, a fixed sampling clock signal f is generated by a computer-controlled frequency generator 1 And an adjustable sampling clock signal f 2 The frequency value of the fixed sampling clock signal is determined by the pulse charging time, i.e. the charging time is an integer number of periods of the fixed sampling clock signal, the frequency of the adjustable sampling clock signal is determined according to the same frequency nominal value and the small frequency deviation relation between the fixed sampling clock signal and the adjustable sampling clock signal, then the phase difference between the fixed sampling clock signal and the adjustable sampling clock signal is detected, the A/D converter carries out digital sampling on the battery voltage in the charging stop period by the fixed sampling clock signal frequency to obtain a voltage sampling value u 1 The battery voltage in the stop charging period is digitally sampled by the adjustable sampling clock signal frequency to obtain a voltage sampling value u 2 Further, the voltage sampling value u is obtained 1 Sum voltage sample value u 2 The obtained phase difference and the obtained voltage difference are stored by the computer, and the periodic change of the phase difference and the voltage difference is monitored by the computer. Monitoring the digitized voltage value in real time by using a computer, and sampling the voltage value u 1 When the voltage is close to the set lowest value of the charging stop period voltage, a voltage sampling value u is obtained 1 Voltage deviation value delta u from the lowest voltage value min Deducing the phase difference delta t between the sampling time of the fixed sampling clock signal and the lowest voltage value of the charge stop period by using the corresponding relation between the stored phase difference and the stored voltage difference min Then using an integer number of sampling clock signalsCycle time and phase difference Δ t min To meter the duty cycle of the pulsed charging.
During the digital sampling period of the battery voltage in the charging stop period, the fixed sampling clock signal and the adjustable sampling clock signal have the same frequency nominal value and have a small frequency deviation relation, so that a stable phase difference which changes periodically is generated between the fixed sampling clock signal and the adjustable sampling clock signal, and the smaller the frequency deviation is, the higher the resolution of the phase difference change is. The invention uses the phase difference of high resolution period change between two sampling clock signals and the corresponding sampling voltage difference to accurately deduce the phase difference between the sampling time of the fixed sampling clock signal and the lowest voltage value of the charging stop period, and carries out high-precision phase difference compensation on the basis of integer number of sampling clock signal period values.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A high-precision digital measurement method for battery pulse charging is characterized by comprising the following steps:
s1, generating a fixed sampling clock signal and an adjustable sampling clock signal by using a frequency generator according to pulse charging time, wherein the pulse charging time comprises an integral number of periods of the fixed sampling clock signal; wherein: frequency f of the fixed sampling clock signal 1 Is equal to f 0 +Δ 1 (ii) a Frequency f of the adjustable sampling clock signal 2 Is equal to f 0 +Δ 2 ；f 0 Is the nominal value of the frequency; delta 1 And Δ 2 Is the frequency deviation, and the two are not equal;
s2, detecting and storing a phase difference value between the adjustable sampling clock signal and the fixed sampling clock signal;
s3, respectively carrying out digital sampling on the voltage in the stop charging period by using the adjustable sampling clock signal and the fixed sampling clock signal, solving and storing the difference value between the sampling values, wherein each difference value corresponds to the phase difference between the adjustable sampling clock signal and the fixed sampling clock signal;
s4, comparing the digital voltage value sampled by the fixed sampling clock signal with the set lowest voltage value in the charge stop period, and solving a voltage deviation value delta u min And deducing a voltage deviation value delta u according to the corresponding relation between the phase difference and the voltage difference value min Corresponding phase difference Δ t min ；
S5, comparing the digital voltage value respectively sampled by the fixed sampling clock signal and the adjustable sampling clock signal with the set lowest value of the battery voltage, if the voltage values are equal, the integral number of the period time of the sampling clock signal corresponding to the digital voltage value is the charging stop time, and if the voltage values are not equal, the phase difference delta t is increased on the basis of the integral number of the period time of the fixed sampling clock signal min And measuring the duty ratio of pulse charging as the charging stopping time.
2. A high accuracy digital measurement system for battery pulse charging, comprising:
a frequency generator for generating a fixed sampling clock signal and an adjustable sampling clock signal; the pulse charging time comprises an integer number of periods of a fixed sampling clock signal; wherein: frequency f of the fixed sampling clock signal 1 Is equal to f 0 +Δ 1 (ii) a Frequency f of the adjustable sampling clock signal 2 Is equal to f 0 +Δ 2 ；f 0 Is the nominal value of the frequency; delta 1 And Δ 2 Is a frequency deviation, and the two are not equal;
a computer for controlling the working state of the frequency generator;
the first analog-to-digital converter is used for digitally sampling the battery voltage in the charge stop period at a fixed sampling clock signal frequency;
the second analog-to-digital converter is used for digitally sampling the battery voltage in the charge stop period at the adjustable sampling clock signal frequency;
the voltage deviation value calculation module is used for comparing the sampling signal of the first analog-to-digital converter with the set voltage lowest value;
the phase difference detection module between the sampling clock signals is used for detecting the phase difference between the fixed sampling clock signals and the adjustable sampling clock signals;
the voltage difference module between the voltage sampling values is used for comparing the voltage sampling values of the first analog-to-digital converter and the second analog-to-digital converter;
the storage periodic data module is used for receiving and storing the output information of the voltage difference module between the voltage sampling values and the phase difference detection module between the sampling clock signals;
the phase difference derivation module is used for receiving and analyzing data of the voltage difference module between the voltage sampling values and the periodic data storage module;
and the duty ratio metering module is used for receiving the data of the derivation phase difference module, the fixed sampling clock signal and the adjustable sampling clock signal and metering the duty ratio according to the data.
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| WO2024061386A1 (en) * | 2023-07-11 | 2024-03-28 | 唐山学院 | Rotor dynamic balance measurement method based on high-precision clock sampling |
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| WO2024061386A1 (en) * | 2023-07-11 | 2024-03-28 | 唐山学院 | Rotor dynamic balance measurement method based on high-precision clock sampling |
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