CN115001071A - Control circuit system capable of improving current control precision and control method - Google Patents

Control circuit system capable of improving current control precision and control method Download PDF

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Publication number
CN115001071A
CN115001071A CN202210540661.8A CN202210540661A CN115001071A CN 115001071 A CN115001071 A CN 115001071A CN 202210540661 A CN202210540661 A CN 202210540661A CN 115001071 A CN115001071 A CN 115001071A
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China
Prior art keywords
control
unit
current
voltage
resistor
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CN202210540661.8A
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Chinese (zh)
Inventor
邹曙
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Shenzhen Huasheng Zhiyuan Technology Co ltd
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Shenzhen Huasheng Zhiyuan Technology Co ltd
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Priority to CN202210540661.8A priority Critical patent/CN115001071A/en
Publication of CN115001071A publication Critical patent/CN115001071A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00711—Regulation of charging or discharging current or voltage with introduction of pulses during the charging process
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a control circuit system capable of improving current control precision and a control method, comprising a controlled unit, a signal conversion circuit unit connected with the controlled unit, a DSP (digital signal processor) and an ADC (analog to digital converter) sampling control unit for receiving voltage sampling signals and current sampling signals from the signal conversion circuit unit, and a power circuit unit connected with the DSP digital control unit, wherein the power circuit unit is used for controlling the voltage sampling signals and the current sampling signals; the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit; the signal conversion unit acquires a voltage original signal and a current original signal from the controlled unit part; the current and voltage values of the controlled unit are respectively sent to the ADC module and the ADC sampling control unit in the DSP through the signal conversion circuit unit, and in the practical application process, the high precision is realized and the high bandwidth is also ensured through the ADC in the DSP and the low-cost external ADC sampling control unit.

Description

Control circuit system capable of improving current control precision and control method
[ technical field ]
The invention relates to the technical field of electronic circuits, in particular to a control circuit system and a control method which can ensure that the control precision meets the requirement and can also ensure the control bandwidth of a voltage with enough high voltage and can improve the current control precision.
[ background art ]
In products such as power supplies and electronic loads, it is often necessary to control the voltage or current at the output/input dc terminal with high accuracy.
For example, in the field of battery formation and capacity grading equipment, it is necessary to control the voltage and current for charging/discharging the battery with high precision, so as to accurately calculate the capacity of the battery, and further perform sorting and pairing on batteries with different capacities. The precision often needs to reach 0.02%, the charge and discharge equipment is generally a digital control switching power supply, sampling control is carried out by using an ADC (analog to digital converter) in a DSP (digital signal processor) or an MCU (micro control unit), an internal analog-to-digital converter of the DSP or the MCU is generally a 12-bit rapid ADC, the sampling rate is as high as 1M Hz, but the highest precision can only reach 0.2%, and the precision requirement can not be met.
The ADC chip which can meet the accuracy requirement and has a controllable cost is generally a Σ Δ ADC, and its accuracy can reach 24 bits, but such ADC chip is not generally integrated in a DSP, and needs to communicate with the DSP to transmit the sampled data to a DSP controller, for example, ADS1219 is a 24-bit ADC with a maximum sampling rate of 1K, I2C communication mode, although such ADC has a high accuracy, because the sampling rate is low, and the I2C communication needs to take milliseconds to transmit data, if it is directly used for loop control of a switching power supply, its voltage-current control bandwidth will be very low, which further causes the current to easily oscillate or even fail and damage.
[ summary of the invention ]
In order to overcome the problems in the prior art, the invention provides a control circuit system and a control method which can ensure that the control precision meets the requirement and can also ensure the sufficiently high voltage current control bandwidth and can improve the current control precision.
The invention provides a control circuit system and a control method capable of improving current control precision, which comprises a controlled unit, a signal conversion circuit unit connected with the controlled unit, a DSP (digital signal processor) and an ADC (analog to digital converter) sampling control unit for receiving voltage sampling signals and current sampling signals from the signal conversion circuit unit, and a power circuit unit connected with the DSP digital control processor, wherein the signal conversion circuit unit is used for converting the voltage sampling signals and the current sampling signals into the voltage sampling signals; the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit; the signal conversion unit acquires a voltage original signal and a current original signal from the controlled unit part; the current and voltage values of the controlled unit are respectively sent to an ADC module and an ADC sampling control unit in the DSP through the signal conversion circuit unit; the ADC module in the DSP is used for real-time control; and the sampling value of the ADC sampling control unit is transmitted to the DSP digital control processor through digital signal communication to carry out high-precision control.
Preferably, the control circuitry detects the output current of the controlled unit through a battery current detection circuit; the battery current detection circuit comprises a resistor R11, a resistor R12, an operational amplifier U1, a polar capacitor C11 and a polar capacitor C12; the positive input end of the operational amplifier U1 is connected with the output end of the resistor R11; the inverting input end of the operational amplifier U1 is connected with the output end of the resistor R12; the output end of the operational amplifier U1 is connected with a first filter circuit containing the polar capacitor C11 and a second filter circuit containing the polar capacitor C12 and then used for AD sampling of the DSP digital control processor and the ADC sampling control unit.
Preferably, the control circuitry detects the output voltage of the controlled unit through a battery voltage detection circuit; the battery voltage detection circuit comprises a resistor R21, a resistor R22, an operational amplifier U2, a polar capacitor C21 and a polar capacitor C22; the positive input end of the operational amplifier U2 is connected with the output end of the resistor R21; the inverting input end of the operational amplifier U2 is connected with the output end of the resistor R22; the output end of the operational amplifier U2 is connected with a third filter circuit comprising the polar capacitor C21 and a fourth filter circuit comprising the polar capacitor C22 and then used for AD sampling of the DSP digital control processor and the ADC sampling control unit.
Preferably, a resistor R14 is further connected between the inverting input terminal and the output terminal of the operational amplifier U1; a resistor R13 is connected between the positive input end of the operational amplifier U1 and the polar capacitor C11; the first filter circuit further comprises a resistor R15; the second filter circuit also includes a resistor R16.
Preferably, a resistor R24 is further connected between the inverting input terminal and the output terminal of the operational amplifier U2; a resistor R23 is connected between the positive input end of the operational amplifier U2 and the polar capacitor C21; the third filter circuit further comprises a resistor R25; the fourth filter circuit further includes a resistor R26.
Preferably, the bandwidth of the filter parameters R15/C11, R25/C21 of the DSP digital control processor is slightly equal to the PWM frequency of the power circuit unit; the bandwidths of the filter parameters R16/C12 and R26/C22 of the ADC sampling control unit are lower than 100Hz so as to filter power frequency components in the voltage and current of the controlled unit.
Preferably, the DSP calculates a PWM signal through a preset control algorithm and transmits the PWM signal to the power circuit unit, so as to control the charging and discharging current; the processing process of the control algorithm comprises a voltage PI regulator 2, a voltage amplitude limiter, a voltage PI regulator 1, a current amplitude limiter, a current PI regulator 2 and a current PI regulator 2; the voltage PI regulator 2 and the current PI regulator 2 respectively form a voltage outer ring and a current outer ring, and form a four-ring structure together with other parts.
A control method capable of improving current control precision is characterized in that a control circuit system comprising a controlled unit, a signal conversion circuit unit, a DSP (digital signal processor) and ADC (analog to digital converter) sampling control unit and a power circuit unit is established, wherein the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit; the signal conversion unit acquires a voltage original signal and a current original signal from the controlled unit part; the current and voltage values of the controlled unit are respectively sent to an ADC module and an ADC sampling control unit in the DSP through the signal conversion circuit unit for real-time control and precision control; and a control algorithm is preset in the DSP digital control processor.
The beneficial effect of this application is as follows:
compared with the prior art, the control circuit system and the control method capable of improving the current control precision of the invention simultaneously adopt a controlled unit, a signal conversion circuit unit connected with the controlled unit, a DSP (digital signal processor) and an ADC (analog to digital converter) sampling control unit for receiving a voltage sampling signal and a current sampling signal from the signal conversion circuit unit, and a power circuit unit connected with the DSP digital control processor, wherein the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit, the signal conversion unit acquires a voltage original signal and a current original signal from the part of the controlled unit, the current and voltage values of the controlled unit are respectively sent to an ADC module and the ADC sampling control unit in the DSP digital control processor through the signal conversion circuit unit, the ADC module in the DSP digital control processor is used for real-time control, in the practical application process, the high precision is realized and the high bandwidth is ensured through the ADC in the digital controller (DSP digital control processor) and the external sigma delta ADC (ADC sampling control unit) with low cost.
[ description of the drawings ]
Fig. 1 is a schematic diagram of an application scenario of a control circuit system capable of improving current control accuracy according to the present invention.
Fig. 2 is a schematic diagram of a battery current detection circuit in a control circuit system capable of improving current control accuracy according to the present invention.
Fig. 3 is a schematic diagram of the connection of the battery voltage detection circuit in the control circuit system capable of improving the current control accuracy according to the present invention.
Fig. 4 is a schematic diagram of a control algorithm corresponding to a control circuit system capable of improving the current control accuracy according to the present invention.
[ detailed description of the invention ]
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and 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.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.
Referring to fig. 1 to 4, a control circuit system and a control method 1 for improving current control accuracy according to the present invention includes a controlled unit, a signal conversion circuit unit connected to the controlled unit, a DSP digital control processor and an ADC sampling control unit for receiving voltage sampling signals and current sampling signals from the signal conversion circuit unit, and a power circuit unit connected to the DSP digital control processor; the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit; the signal conversion unit acquires a voltage original signal and a current original signal from the controlled unit part; the current and voltage values of the controlled unit are respectively sent to an ADC module and an ADC sampling control unit in the DSP through the signal conversion circuit unit; the ADC module in the DSP is used for real-time control; and the sampling value of the ADC sampling control unit is transmitted to the DSP digital control processor through digital signal communication to carry out high-precision control.
The application is through adopting simultaneously by the accuse unit, with by the signal conversion circuit unit that the accuse unit is connected, be used for receiving the voltage sampling signal, the DSP digital control treater and the ADC sampling control unit of the electric current sampling signal that come from the signal conversion circuit unit and with the power circuit unit that DSP digital control treater is connected, power circuit unit with by the accuse unit is connected, give by the accuse unit charging and discharging, signal conversion unit obtains the original signal of voltage and the original signal of electric current that come from the accuse unit position, and the electric current and the voltage value of controlled unit are sent respectively to the inside ADC module and the ADC sampling control unit of DSP digital control treater through the signal conversion circuit unit, and the inside ADC module of DSP digital control treater is used for carrying out real-time control, and the sampling value of ADC sampling control unit conveys through the digital signal communication and carries out high accuracy control in the DSP digital control treater, in the practical application process, the high precision is realized and the high bandwidth is ensured through the ADC inside the digital controller (DSP digital control processor) and the sigma delta ADC (ADC sampling control unit) which is low in cost and externally arranged.
In practical design, the controlled unit may be a battery unit or a load unit; the present application is not particularly limited.
The power circuit unit charges and discharges the battery, the voltage value and the current value of the battery are respectively sent to the sigma delta ADC and the DSP internal ADC through the signal conversion circuit for sampling, the sampling value of the DSP internal ADC is used for real-time control, and the sampling value of the sigma delta ADC is transmitted to the DSP through digital signal communication and then is used for high-precision control.
Further, the control circuit system detects the output current of the controlled unit through a battery current detection circuit; the battery current detection circuit comprises a resistor R11, a resistor R12, an operational amplifier U1, a polar capacitor C11 and a polar capacitor C12; the positive input end of the operational amplifier U1 is connected with the output end of the resistor R11; the inverting input end of the operational amplifier U1 is connected with the output end of the resistor R12; the output end of the operational amplifier U1 is connected with a first filter circuit containing the polar capacitor C11 and a second filter circuit containing the polar capacitor C12 and then used for AD sampling of the DSP digital control processor and the ADC sampling control unit.
The voltage I + and I-on the battery current sampling resistor is amplified by the operational amplifier U1, R11\ R12\ R13\ R14 and then divided into two paths to pass through R15/C11, and the filtered R16/C12 is respectively sent to the DSP and the sigma delta ADC for AD sampling.
In a preferred embodiment, the control circuitry detects the output voltage of the controlled unit through a battery voltage detection circuit; the battery voltage detection circuit comprises a resistor R21, a resistor R22, an operational amplifier U2, a polar capacitor C21 and a polar capacitor C22; the positive input end of the operational amplifier U2 is connected with the output end of the resistor R21; the inverting input end of the operational amplifier U2 is connected with the output end of the resistor R22; the output end of the operational amplifier U2 is connected with a third filter circuit comprising the polar capacitor C21 and a fourth filter circuit comprising the polar capacitor C22 and then used for AD sampling of the DSP digital control processor and the ADC sampling control unit.
The voltage V +/V-at two ends of the controlled unit is amplified by the operational amplifier U2, R21\ R22\ R23\ R24 and then divided into two paths to pass through R25/C21, and the two paths are filtered by the R26/C22 and then respectively sent to the DSP and the sigma delta ADC for AD sampling.
Further, a resistor R14 is connected between the inverting input terminal and the output terminal of the operational amplifier U1; a resistor R13 is connected between the positive input end of the operational amplifier U1 and the polar capacitor C11; the first filter circuit further comprises a resistor R15; the second filter circuit also includes a resistor R16.
In a preferred embodiment, a resistor R24 is connected between the inverting input terminal and the output terminal of the operational amplifier U2; a resistor R23 is connected between the positive input end of the operational amplifier U2 and the polar capacitor C21; the third filter circuit further comprises a resistor R25; the fourth filter circuit further includes a resistor R26.
Further, the bandwidth of the filter parameters R15/C11, R25/C21 of the DSP digital control processor is slightly equal to the PWM frequency of the power circuit unit; the bandwidths of the filter parameters R16/C12 and R26/C22 of the ADC sampling control unit are lower than 100Hz so as to filter power frequency components in the voltage and current of the controlled unit.
In practical design, as the sampling values of the DSP and the sigma-delta ADC are respectively used for real-time control and precision control, the filter parameters of the two signals are different, the bandwidth of the filter parameters R15/C11 and R25/C21 of the DSP signal is set to be approximately equal to the PWM frequency of a power circuit, and the bandwidth of the filter parameters R16/C12 and R26/C22 of the sigma-delta ADC signal is set to be lower than 100Hz so as to filter power frequency components in battery voltage/current.
In a preferred embodiment, the DSP digital control processor calculates a PWM signal through a preset control algorithm and transmits the PWM signal to the power circuit unit, thereby realizing control of charging and discharging current; the processing process of the control algorithm comprises a voltage PI regulator 2, a voltage amplitude limiter, a voltage PI regulator 1, a current amplitude limiter, a current PI regulator 2 and a current PI regulator 2; the voltage PI regulator 2 and the current PI regulator 2 respectively form a voltage outer ring and a current outer ring, and form a four-ring structure together with other parts.
In fig. 4, the voltage-current feedback amount obtained by the DSP (DSP digital control processor) ADC itself is 1, and the feedback amount obtained by the Σ Δ ADC is 2.
In the practical application process, the battery voltage is given as a voltage value expected by the system, and is used as a given signal of the voltage outer ring 2, after the voltage feedback 2 is subtracted, the given signal passes through the voltage outer ring PI regulator 2, and is output and is used as a voltage fine adjustment quantity after amplitude limiting, and the given phase of the battery voltage is accumulated to be used as a given signal of the voltage inner ring. The difference value between the given voltage inner loop and the feedback 1 passes through the voltage regulator 1, and the output is used as a given signal of the current outer loop after current amplitude limiting. The difference value between the current outer ring given signal and the current feedback 2 passes through the current outer ring PI regulator 2, is output, passes through the current fine tuning amplitude limiting, and then is accumulated with the current given phase to be used as the given signal of the current inner ring. The difference value between the given signal and the current feedback 1 is calculated after passing through the current inner loop PI regulator, PWM of corresponding pulse width is sent to the power circuit, and the size of charging and discharging voltage/current can be controlled.
In particular, the sampling speeds of the feedback 2 and the feedback 1 are different, the feedback 2 generally needs about 10ms in consideration of the sampling time and the communication time, and therefore, the bandwidths of the voltage outer loop and the current outer loop need to be set to about 10Hz, the sampling speed of the feedback 1 generally needs to be several tens of KHz, and therefore, the bandwidths of the voltage inner loop and the current inner loop are generally set to be within 10K.
The amplitude of the voltage fine tuning amplitude limit needs to be set according to the average error of the voltage feedback 2 and the voltage feedback 1, the amplitude of the current fine tuning amplitude limit needs to be set according to the average error of the current feedback 2 and the current feedback 1, and the amplitude limit is about 1% of the range generally.
A control method capable of improving current control precision is characterized in that a control circuit system comprising a controlled unit, a signal conversion circuit unit, a DSP (digital signal processor) and ADC (analog to digital converter) sampling control unit and a power circuit unit is established, wherein the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit; the signal conversion unit acquires a voltage original signal and a current original signal from the controlled unit part; the current and voltage values of the controlled unit are respectively sent to an ADC module and an ADC sampling control unit in the DSP through the signal conversion circuit unit for real-time control and precision control; and a control algorithm is preset in the DSP digital control processor.
The beneficial effect of this application is as follows:
compared with the prior art, the control circuit system and the control method 1 can improve the current control precision by simultaneously adopting a controlled unit, a signal conversion circuit unit connected with the controlled unit, a DSP (digital signal processor) and an ADC (analog to digital converter) sampling control unit for receiving a voltage sampling signal and a current sampling signal from the signal conversion circuit unit, and a power circuit unit connected with the DSP digital control processor, wherein the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit, the signal conversion unit acquires a voltage original signal and a current original signal from the part of the controlled unit, the current and voltage values of the controlled unit are respectively sent to an ADC module and the ADC sampling control unit in the DSP digital control processor through the signal conversion circuit unit, and the ADC module in the DSP digital control processor is used for real-time control, the sampling value of the ADC sampling control unit is transmitted to the DSP digital control processor for high-precision control through digital signal communication, and in the practical application process, the high precision is realized and the high bandwidth is ensured through the ADC inside the digital controller (DSP digital control processor) and the sigma delta ADC (ADC sampling control unit) which is low in cost and externally arranged.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (8)

1. A control circuit system capable of improving current control precision is characterized in that: the device comprises a controlled unit, a signal conversion circuit unit connected with the controlled unit, a DSP (digital signal processor) digital control processor and an ADC (analog to digital converter) sampling control unit for receiving voltage sampling signals and current sampling signals from the signal conversion circuit unit, and a power circuit unit connected with the DSP digital control processor; the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit; the signal conversion unit acquires a voltage original signal and a current original signal from the controlled unit part; the current and voltage values of the controlled unit are respectively sent to an ADC module and an ADC sampling control unit in the DSP through the signal conversion circuit unit; the ADC module in the DSP is used for real-time control; and the sampling value of the ADC sampling control unit is transmitted to the DSP digital control processor through digital signal communication to carry out high-precision control.
2. The control circuitry of claim 1 for improving accuracy of current control, wherein: the control circuit system detects the output current of the controlled unit through a battery current detection circuit; the battery current detection circuit comprises a resistor R11, a resistor R12, an operational amplifier U1, a polar capacitor C11 and a polar capacitor C12; the positive input end of the operational amplifier U1 is connected with the output end of the resistor R11; the inverting input end of the operational amplifier U1 is connected with the output end of the resistor R12; the output end of the operational amplifier U1 is connected with a first filter circuit containing the polar capacitor C11 and a second filter circuit containing the polar capacitor C12 and then used for AD sampling of the DSP digital control processor and the ADC sampling control unit.
3. The control circuitry for improving current control accuracy of claim 1, wherein: the control circuit system detects the output voltage of the controlled unit through a battery voltage detection circuit; the battery voltage detection circuit comprises a resistor R21, a resistor R22, an operational amplifier U2, a polar capacitor C21 and a polar capacitor C22; the positive input end of the operational amplifier U2 is connected with the output end of the resistor R21; the inverting input end of the operational amplifier U2 is connected with the output end of the resistor R22; the output end of the operational amplifier U2 is connected with a third filter circuit comprising the polar capacitor C21 and a fourth filter circuit comprising the polar capacitor C22 and then used for AD sampling of the DSP digital control processor and the ADC sampling control unit.
4. The control circuitry of claim 2, wherein the control circuitry is further configured to: a resistor R14 is also connected between the inverting input end and the output end of the operational amplifier U1; a resistor R13 is connected between the positive input end of the operational amplifier U1 and the polar capacitor C11; the first filter circuit further comprises a resistor R15; the second filter circuit also includes a resistor R16.
5. The control circuitry of claim 3 for improving accuracy of current control, wherein: a resistor R24 is connected between the inverting input end and the output end of the operational amplifier U2; a resistor R23 is connected between the positive input end of the operational amplifier U2 and the polar capacitor C21; the third filter circuit further comprises a resistor R25; the fourth filter circuit further includes a resistor R26.
6. The control circuitry for improving current control accuracy as recited in any of claims 1 to 5, wherein: the bandwidth of the filter parameters R15/C11 and R25/C21 of the DSP digital control processor is slightly equal to the PWM frequency of the power circuit unit; the bandwidth of the filter parameters R16/C12 and R26/C22 of the ADC sampling control unit is lower than 100Hz, so that industrial frequency components in the voltage and current of the controlled unit are filtered.
7. The control circuitry of claim 1 for improving accuracy of current control, wherein: the DSP digital control processor calculates a PWM signal through a preset control algorithm and sends the PWM signal to the power circuit unit to realize the control of charging and discharging current; the processing process of the control algorithm comprises a voltage PI regulator 2, a voltage amplitude limiter, a voltage PI regulator 1, a current amplitude limiter, a current PI regulator 2 and a current PI regulator 2; the voltage PI regulator 2 and the current PI regulator 2 respectively form a voltage outer ring and a current outer ring, and form a four-ring structure together with other parts.
8. A control method capable of improving current control accuracy is characterized in that: establishing a control circuit system comprising a controlled unit, a signal conversion circuit unit, a DSP (digital signal processor) digital control processor, an ADC (analog to digital converter) sampling control unit and a power circuit unit, wherein the power circuit unit is connected with the controlled unit and charges and discharges the controlled unit; the signal conversion unit acquires a voltage original signal and a current original signal from the controlled unit part; the current and voltage values of the controlled unit are respectively sent to an ADC module and an ADC sampling control unit in the DSP through the signal conversion circuit unit for real-time control and precision control; and a control algorithm is preset in the DSP digital control processor.
CN202210540661.8A 2022-05-19 2022-05-19 Control circuit system capable of improving current control precision and control method Pending CN115001071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210540661.8A CN115001071A (en) 2022-05-19 2022-05-19 Control circuit system capable of improving current control precision and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210540661.8A CN115001071A (en) 2022-05-19 2022-05-19 Control circuit system capable of improving current control precision and control method

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Publication Number Publication Date
CN115001071A true CN115001071A (en) 2022-09-02

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Application publication date: 20220902