CN116742756B - Method, circuit, system and readable storage medium for controlling charging current based on charger - Google Patents
Method, circuit, system and readable storage medium for controlling charging current based on charger Download PDFInfo
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- CN116742756B CN116742756B CN202310956284.0A CN202310956284A CN116742756B CN 116742756 B CN116742756 B CN 116742756B CN 202310956284 A CN202310956284 A CN 202310956284A CN 116742756 B CN116742756 B CN 116742756B
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Classifications
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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
- H02J7/00712—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
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- 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
Abstract
The invention provides a method for controlling charging current based on a charger, which comprises the following steps: setting Vin as the input voltage of the charge, vout as the output voltage, icc as the charging current of the battery, iin as the charge input current, iou as the charge output current, η as the conversion efficiency of the charge, and S2: setting the amplification factor of the current sampling amplifier to the input current as K, the input of the analog-to-digital converter as K.times.vin, the input analog signal of the analog-to-digital converter as K.times.Iin, and the voltage reference of the digital-to-analog converter as eta.vin; setting K x Icc to be equal to an external reference voltage Vset, and giving the external reference voltage Vset corresponding to the different charging currents Icc required by the charge; the external reference voltage Vset is summed by an error amplifier EAClamping to equal voltages automatically adjusts the Iin current required at different input voltages Vin and different output voltages Vout.
Description
Technical Field
The invention relates to the technical field of charge and discharge systems, in particular to a method, a circuit, a system and a readable storage medium for controlling charge current based on a charge.
Background
In order to precisely control the charging current, a charger (charger) generally controls the battery charging current and voltage by directly sampling the charging current. At present, two modes of directly sampling charging current are mainly adopted: the method 1. A charger integrated with a bat (battery field effect transistor) is used for sampling the bat current to control the charging current; method 2. The charging current is controlled by sampling the charging current through an off-chip sampling resistor by the charger without integrating the bat.
The two sampling methods have the following defects: the defect 1: introducing extra power loss, assuming that the on-resistance of the internal bat fet in method 1 and the resistance of the off-chip sampling resistor in method 2 are both Rsen, and the charging current is Icc, then both the above-mentioned charging current sampling methods introduce extra power loss: icc (Icc) 2 * Rsen, this loss can reduce the charge efficiency of the charge; the disadvantage 2 is: method 1 requires the integration of a power transistor bat inside the chip, which increases the chip area and cost of the charge, while method 2 requires the addition of off-chip devices, which increases board-level circuit area and cost.
In view of the foregoing, there is a need for a new method, circuit, system, and readable storage medium for controlling charging current based on charge to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide a method for controlling charging current based on a charger, which does not need an internal integrated MOS device or an external sampling resistor, reduces the cost of a chip and a circuit and improves the charging efficiency.
In order to achieve the above object, the present invention provides a method for controlling a charging current based on a charger, comprising the steps of:
s1: setting the input voltage of the charger to Vin, the output voltage to Vout, the charging current of the battery to Icc, the input current of the charger to Iin, the output current of the charger to Iou, and the conversion efficiency of the charger to eta,
the input total power Pin is equal to the output total power Pout plus the loss power Ploss,
i.e., pin=pout+ploss formula (1);
input total power pin=vin×iin formula (2);
output total power pout=vout×icc formula (3);
conversion efficiency η represents the ratio of output power to input power: η=pout/Pin,
i.e. η=pout formula (4);
substituting the formula (2) and the Pout formula (3) into the formula (4) to obtain the following formula:
vin x Iin x η = Vout x Icc formula (5);
s2: setting the amplification factor of the current sampling amplifier to the input current as K, the input of the analog-to-digital converter as K.times.vin, the input analog signal of the analog-to-digital converter as K.times.Iin, and the voltage reference of the digital-to-analog converter as eta.vin;
the following formula (6) is obtained according to formula (1):
k_iin_vin_η=k_icc_vout formula (6);
and then the following formula (7) is obtained according to the formula (2):
s3: let K x Icc equal to the external reference voltage Vset, the charge giving the external reference voltage Vset corresponding to the different charging currents Icc required by the charge;
s4: the external reference voltage Vset is summed by an error amplifier EAClamping to equal voltages automatically adjusts the Iin current required at different input voltages Vin and different output voltages Vout.
A circuit for controlling charging current based on charge comprises an analog-to-digital converter, a digital-to-analog converter and an operational amplifier, wherein a first input end of the analog-to-digital converter is connected with a signal K-Vin, a second input end of the analog-to-digital converter is connected with a voltage reference signal Vout, the digital-to-analog converter is connected with a voltage reference signal eta-Vin, a homodromous input end of the operational amplifier is connected with an external reference voltage Vset,
the analog-to-digital converter is electrically connected with the digital-to-analog converter, the analog-to-digital converter outputs a digital signal b to the digital-to-analog converter, the digital-to-analog converter is connected with the reverse input end of the operational amplifier, and the digital-to-analog converter outputs a signal iadt_cc to the operational amplifier.
Preferably, the input of the analog-to-digital converter is k×vin, the input analog signal of the analog-to-digital converter is k×iin, and the voltage reference of the analog-to-digital converter is Vout, although the output digital signal b of the analog-to-digital converter;
the output signal b of the analog-to-digital converter is input into the digital-to-analog converter, wherein the voltage reference of the digital-to-analog converter is eta x Vin, and the digital-to-analog converter is used for converting the proportion represented by the digital signal b into an analog signal and outputting the analog signal:i.e., the output signal iadt_cc;
the operational amplifier is used for ensuring that the iadt_cc and the external reference voltage Vset signals are always equal by adjusting the output signal comp;
when the input voltage Vin and the output voltage Vout change, the circuit for controlling the charging current based on the charge can always ensure by adjusting the IinThe value of (c) is unchanged, i.e. the charging current is unchanged.
A system for controlling charging current based on a charge, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement a method for controlling charging current based on a charge.
A computer-readable storage medium storing a computer-readable program that is executed by a processor to implement a method of controlling a charging current based on a charger.
Compared with the prior art, the technical scheme in the application does not need an internal integration MOS device or an external sampling resistor, can realize the accurate control of the charging current, reduces the cost of a chip and a circuit, eliminates the power loss caused by the original internal integration MOS device and the external sampling resistor, thereby further improving the charging efficiency, shortening the charging time and being beneficial to energy conservation and environmental protection.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The features and advantages of the invention may be realized and obtained by means of the elements and combinations particularly pointed out in the appended claims. These and other features of the present invention will become more fully apparent from the following description and appended claims, or may be learned by the practice of the embodiments of the invention as set forth hereinafter.
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 will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a circuit for controlling charging current based on a charger according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the invention, and not to limit the invention.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. It will be apparent to those skilled in the art that the terms described above have the particular meaning in the present invention, as the case may be.
Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature. Furthermore, the meaning of "a plurality of", "a number" means two or more, unless specifically defined otherwise.
Referring to fig. 1, the present invention provides a method for controlling charging current based on a charger, comprising the following steps:
s1: setting the input voltage of the charge to Vin, the output voltage (i.e., battery voltage) to Vout, the charge current of the charge to the battery to Icc, the charge input current to Iin, the charge output current to Iout, and the conversion efficiency of the charge to η,
from conservation of energy it is known that the input total power Pin is equal to the output total power Pout plus the loss power Ploss,
i.e., pin=pout+ploss formula (1);
input total power pin=vin×iin formula (2);
the total output power pout=vout,
since the output current Iout is equal to the charging current Icc, i.e., pout=vout×icc;
i.e. pout=vout×icc formula (3);
conversion efficiency η represents the ratio of the total output power to the total input power: η=pout/Pin,
i.e. η=pout formula (4);
substituting the formula (2) and the Pout formula (3) into the formula (4) to obtain the following formula:
vin x Iin x η = Vout x Icc formula (5);
in order to facilitate the control of the charging current, the charge uses a current sampling amplifier to convert the input current into a voltage signal for control,
setting the amplification factor of the current sampling amplifier to the input current as K, the input of the analog-to-digital converter as K, the input analog signal of the analog-to-digital converter as K, the voltage reference of the digital-to-analog converter as eta as Vin, namely the output voltage Vsen=Iin as K of the current sampling amplifier.
S2: the following formula (6) is obtained according to formula (1):
k_iin_vin_η=k_icc_vout formula (6);
and then the following formula (7) is obtained according to the formula (2):
s3: the zero Icc is set equal to the external reference voltage Vset, to which the charge internally gives the external reference voltage Vset corresponding to the different charging currents Icc required by the charge.
Since the input voltage Vin and the output voltage (battery voltage) Vout of the charge are both varied in practical application, iin at different input voltages Vin and different output voltages Vout is calculated according to formula (7), and the value of Iin is adjusted by control, so as to obtain a fixed charging current Icc.
S4: the external reference voltage Vset is summed by an error amplifier EAClamping to equal voltages, the loop automatically adjusts the Iin current required at different input voltages Vin and different output voltages Vout.
In particular, the formula is implemented using an analog-to-digital converter (ADC) and digital-to-analog converter (DAC)Wherein the input of the analog-to-digital converter is K Vin, the input analog signal of the analog-to-digital converter is K Iin, the voltage reference of the analog-to-digital converter is Vout (i.e., the output voltage of the charger), while the output digital signal b (bn … b3, b2, b1, b 0) of the analog-to-digital converter may represent the ratio of K Vin in Vout, i.e., bn … b3, b2, b1, b0 actually represents->Information of (2);
the output signals b (bn … b3, b2, b1, b 0) of the analog-to-digital converter are input into the digital-to-analog converter, wherein the voltage reference of the digital-to-analog converter is η x Vin, and the digital-to-analog converter is used for converting the proportion represented by the digital signals b (bn … b3, b2, b1, b 0) into analog signals for output:and then obtain the formula (7)I.e., iadt_cc shown in fig. 1.
The effect of the operational amplifier (EA) is to ensure that the iadt_cc and external reference voltage Vset signals are always equal by adjusting comp. The external reference voltage Vset represents the present charging current information, and the control voltage Vset is also fixed for a fixed charging current Icc.
When the input voltage Vin and the output voltage Vout change, the circuit for controlling the charging current based on the charge can always ensure by adjusting the IinThe value of (a) is unchanged, namely the charging current is unchanged, and the accurate control of the charging current (output current) is realized.
In summary, in the technical solution of the present application, by using the sampling information of the input current, the input current Iin, the input voltage Vin and the output voltage (battery voltage) Vout are calculated according to the algorithm provided in the present application, so as to realize accurate control of the charging current (output current).
The technical scheme in this application need not interior integrated MOS device, also does not need external sampling resistance, just can realize the accurate control to charging current, has reduced chip and circuit cost, has eliminated because of the power loss of original interior integrated MOS device and external sampling resistance to still improved charging efficiency, shortened the charging time, also be favorable to energy-concerving and environment-protective.
The invention also provides a circuit for controlling charging current based on a charger, which comprises an analog-to-digital converter, a digital-to-analog converter and an operational amplifier, wherein a first input end of the analog-to-digital converter is connected with a signal K x Vin, a second input end of the analog-to-digital converter is connected with a voltage reference signal Vout, the digital-to-analog converter is connected with a voltage reference signal eta x Vin, a homodromous input end (+) of the operational amplifier is connected with an external reference voltage Vset,
the analog-to-digital converter is electrically connected with the digital-to-analog converter, the digital-to-analog converter outputs a digital signal b to the digital-to-analog converter, the digital-to-analog converter is connected with the reverse input end (-) of the operational amplifier, and the digital-to-analog converter outputs a signal iadt_cc to the operational amplifier.
Specifically, the input of the analog-to-digital converter is k×vin, the input analog signal of the analog-to-digital converter is k×iin, the voltage reference of the analog-to-digital converter is Vout, and although the output digital signal b (bn … b3, b2, b1, b 0) of the analog-to-digital converter is represented by the ratio of k×vin in Vout, that is, bn … b3, b2, b1, b0 actually representsInformation of (2);
the output signals b (bn … b3, b2, b1, b 0) of the analog-to-digital converter are input into the digital-to-analog converter, wherein the voltage reference of the digital-to-analog converter is η x Vin, and the digital-to-analog converter is used for converting the proportion represented by the digital signals b (bn … b3, b2, b1, b 0) into analog signals for output:i.e. the output signal iadt_cc shown in fig. 1.
The effect of the operational amplifier (EA) is to ensure that the iadt_cc and external reference voltage Vset signals are always equal by adjusting the output signal comp. Wherein, the external reference voltage Vset represents the present charging current information.
When the input voltage Vin and the output voltage Vout change, the charge loop can adjust the magnitude of IinTo always ensureThe value of (a) is unchanged, namely the charging current is unchanged, and the accurate control of the charging current (output current) is realized.
The invention also provides a system for controlling the charging current based on the charger, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the method for controlling the charging current based on the charger.
The present invention also provides a computer-readable storage medium storing a computer-readable program that is executed by a processor to implement a method of controlling a charging current based on a charger.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (but not limited to phase-change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other optical, magnetic storage media, etc.) having computer-usable program code embodied therein.
The computer readable storage medium provided by the above-described embodiments of the present application has the same advantageous effects as the method adopted, operated or implemented by the application program stored therein, for the same inventive concept as the method provided by the embodiments of the present application.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the details and embodiments described herein, and thus additional advantages and modifications may readily be made by those skilled in the art, without departing from the spirit and scope of the general concepts defined in the claims and the equivalents thereof, and the invention is not limited to the specific details, representative apparatus and illustrative examples shown and described herein.
Claims (4)
1. The method for controlling the charging current based on the charge comprises a circuit for controlling the charging current based on the charge, wherein the circuit for controlling the charging current based on the charge comprises an analog-to-digital converter, a digital-to-analog converter and an operational amplifier, a first input end of the analog-to-digital converter is connected with a signal K x Vin, a second input end of the analog-to-digital converter is connected with a voltage reference signal Vout, the digital-to-analog converter is connected with a voltage reference signal eta x Vin, a homodromous input end of the operational amplifier is connected with an external reference voltage Vset,
the analog-to-digital converter is electrically connected with the digital-to-analog converter, the analog-to-digital converter outputs a digital signal b to the digital-to-analog converter, the digital-to-analog converter is connected with the reverse input end of the operational amplifier, and the digital-to-analog converter outputs a signal iadt_cc to the operational amplifier;
the method for controlling the charging current based on the charger is characterized by comprising the following steps:
s1: setting the input voltage of the charger to Vin, the output voltage to Vout, the charging current of the battery to Icc, the input current of the charger to Iin, the output current of the charger to Iou, and the conversion efficiency of the charger to eta,
the input total power Pin is equal to the output total power Pout plus the loss power Ploss,
i.e., pin=pout+ploss formula (1);
input total power pin=vin×iin formula (2);
output total power pout=vout×icc formula (3);
conversion efficiency η represents the ratio of output power to input power: η=pout/Pin,
i.e. η=pout formula (4);
substituting the formula (2) and the Pout formula (3) into the formula (4) to obtain the following formula:
vin x Iin x η = Vout x Icc formula (5);
s2: setting the amplification factor of the current sampling amplifier to the input current as K, the input of the analog-to-digital converter as K.times.vin, the input analog signal of the analog-to-digital converter as K.times.Iin, and the voltage reference of the digital-to-analog converter as eta.vin;
the following formula (6) is obtained according to formula (1):
k_iin_vin_η=k_icc_vout formula (6);
and then the following formula (7) is obtained according to the formula (2):
s3: setting K x Icc to be equal to an external reference voltage Vset, and giving the external reference voltage Vset corresponding to the different charging currents Icc required by the charge;
s4: the external reference voltage Vset is summed by an error amplifier EAClamping to equal voltages automatically adjusts the Iin current required at different input voltages Vin and different output voltages Vout.
2. The circuit for controlling charging current based on the charge is characterized by comprising an analog-to-digital converter, a digital-to-analog converter and an operational amplifier, wherein a first input end of the analog-to-digital converter is connected with a signal K x Vin, a second input end of the analog-to-digital converter is connected with a voltage reference signal Vout, the digital-to-analog converter is connected with a voltage reference signal eta x Vin, a same-direction input end of the operational amplifier is connected with an external reference voltage Vset,
the analog-digital converter is electrically connected with the digital-analog converter, the analog-digital converter outputs a digital signal b to the digital-analog converter, the digital-analog converter is connected with the reverse input end of the operational amplifier, the digital-analog converter outputs a signal iadt_cc to the operational amplifier, wherein the input voltage of the charge is set as Vin, the output voltage is Vout, the charging current of the battery is set as Icc, the input current of the charge is set as Iin, the output current of the charge is set as Iou, the conversion efficiency of the charge is set as eta, the amplification factor of the current sampling amplifier to the input current is set as K,
the input of the analog-to-digital converter is K-Vin, the input analog signal of the analog-to-digital converter is K-Iin, the voltage reference of the analog-to-digital converter is Vout, and the output digital signal b of the analog-to-digital converter;
the output signal b of the analog-to-digital converter is input into the digital-to-analog converter, wherein the voltage reference of the digital-to-analog converter is eta x Vin, and the digital-to-analog converter is used for converting the proportion represented by the digital signal b into an analog signal and outputting the analog signal:i.e., the output signal iadt_cc;
the operational amplifier is used for ensuring that the iadt_cc and the external reference voltage Vset signals are always equal by adjusting the output signal comp;
when the input voltage Vin and the output voltage Vout change, the circuit for controlling the charging current based on the charge can always ensure by adjusting the IinThe value of (c) is unchanged, i.e. the charging current is unchanged.
3. A system for controlling charging current based on a charge, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method for controlling charging current based on a charge of claim 1.
4. A computer-readable storage medium storing a computer-readable program that is executed by a processor to implement the method of controlling charging current based on a charger of claim 1.
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| KR19980065907A (en) * | 1997-01-16 | 1998-10-15 | 김광호 | Battery fast charge control device |
| CN104977966A (en) * | 2014-07-25 | 2015-10-14 | 成都芯源系统有限公司 | Self-adaptive voltage positioning direct current voltage stabilizer and controller and control method thereof |
| CN113884919A (en) * | 2021-09-13 | 2022-01-04 | 珠海迈巨微电子有限责任公司 | Current acquisition circuit, integrated device and battery management system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7113122B2 (en) * | 2005-01-19 | 2006-09-26 | Atmel Corporation | Current sensing analog to digital converter and method of use |
| EP2860844A1 (en) * | 2013-09-20 | 2015-04-15 | Electrochem Solutions, Inc. | Adaptive charger to maximize charge rate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980065907A (en) * | 1997-01-16 | 1998-10-15 | 김광호 | Battery fast charge control device |
| CN104977966A (en) * | 2014-07-25 | 2015-10-14 | 成都芯源系统有限公司 | Self-adaptive voltage positioning direct current voltage stabilizer and controller and control method thereof |
| CN113884919A (en) * | 2021-09-13 | 2022-01-04 | 珠海迈巨微电子有限责任公司 | Current acquisition circuit, integrated device and battery management system |
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