CN114156999A - Battery charging and discharging circuit slow starting method and device and battery charging and discharging system - Google Patents
Battery charging and discharging circuit slow starting method and device and battery charging and discharging system Download PDFInfo
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- CN114156999A CN114156999A CN202111274147.6A CN202111274147A CN114156999A CN 114156999 A CN114156999 A CN 114156999A CN 202111274147 A CN202111274147 A CN 202111274147A CN 114156999 A CN114156999 A CN 114156999A
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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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
-
- 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
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
-
- 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)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a battery charging and discharging circuit slow starting method and device and a battery charging and discharging system, wherein the method comprises the following steps: acquiring the voltage of a battery, the voltage between each stage of DC/DC circuit in the DC/DC unit and the voltage of a direct current bus between the DC/DC unit and the DC/AC circuit in real time; if the direct current bus is started from the power grid side, closing the third switch, and closing the fourth switch, opening the third switch and closing the first switch when the direct current bus voltage is greater than a first preset voltage value; if the voltage of the direct current bus is greater than the voltage of the battery, the second switch is closed, and the battery charging and discharging circuit is started; and if the voltage of the direct current bus is not greater than the voltage of the battery, calculating the differential pressure of each stage of circuit in the battery charging and discharging circuit, and if the differential pressure of each stage of circuit is within the corresponding preset differential pressure range, closing the second switch, and completing the starting of the battery charging and discharging circuit. The invention can realize the slow start of the battery charging and discharging circuit in a wide voltage range.
Description
Technical Field
The invention belongs to the technical field of circuit control, and particularly relates to a battery charging and discharging circuit slow starting method and device and a battery charging and discharging system.
Background
In order to suppress interference signals, a filter capacitor is used in a battery charging and discharging circuit, and due to the existence of the filter capacitor, the battery charging and discharging circuit is easy to generate impact current at the initial stage of power supply, so that a power supply and a power circuit are greatly impacted, and the reliability of the battery charging and discharging circuit is seriously reduced, so that a slow start circuit is additionally arranged in the battery charging and discharging circuit to realize the slow start of the battery charging and discharging circuit.
However, in order to widen the voltage range of the battery charging and discharging circuit, a multi-stage DC/DC circuit may be adopted in the prior art, and the slow start scheme for the single-stage DC/DC circuit in the prior art is not applicable.
Disclosure of Invention
The invention aims to provide a battery charging and discharging circuit slow starting method and device and a battery charging and discharging system, so as to realize the slow starting of the battery charging and discharging circuit in a wide voltage range.
In order to achieve the purpose, the invention adopts the technical scheme that a battery charging and discharging circuit slow starting method is provided, and the method is applied to the battery charging and discharging circuit; the battery charging and discharging circuit comprises a DC/DC unit and a DC/AC circuit, wherein one side of the DC/DC unit is used for being connected with a battery, the other side of the DC/DC unit is connected with the direct current side of the DC/AC circuit, and the alternating current side of the DC/AC circuit is used for being connected with a power grid; the DC/DC unit is used for being connected with a battery, a first buffer unit is connected in series on a line, the DC/AC circuit is used for being connected with a power grid, a second buffer unit is connected in series on the line, the first buffer unit comprises a first buffer resistor, a first switch and a second switch, and the first buffer resistor is connected with the first switch in series and then connected with the second switch in parallel; the second buffer unit comprises a second buffer resistor, a third switch and a fourth switch, and the second buffer resistor is connected with the third switch in series and then connected with the fourth switch in parallel; the DC/DC unit includes at least one stage of DC/DC circuit connected in series; the method comprises the following steps:
acquiring battery voltage, voltage between each stage of DC/DC circuit in the DC/DC unit and direct current bus voltage between the DC/DC unit and the DC/AC circuit in real time;
if the direct current bus is started from the power grid side, closing the third switch, and closing the fourth switch, opening the third switch and closing the first switch when the direct current bus voltage is greater than a first preset voltage value;
if the voltage of the direct current bus is greater than the voltage of the battery, closing a second switch, and finishing the starting of the battery charging and discharging circuit;
and if the voltage of the direct current bus is not greater than the voltage of the battery, calculating the differential pressure of each stage of circuit in the battery charging and discharging circuit, and if the differential pressure of each stage of circuit is within the corresponding preset differential pressure range, closing a second switch, and completing the starting of the battery charging and discharging circuit.
In a possible implementation manner, the method for slow start of the battery charging and discharging circuit further includes:
and acquiring the voltage of the battery, and judging whether to start from the power grid side according to the voltage of the battery.
In a possible implementation manner, the determining whether to start from the grid side according to the magnitude of the battery voltage includes:
if the battery voltage is smaller than a second preset voltage value, judging that the battery is started from the power grid side;
and if the battery voltage is not less than a second preset voltage value, judging to start from the power grid side or from the battery side.
In a possible implementation manner, after the determining that the dc bus voltage is greater than the battery voltage and before the closing of the second switch, the method for starting the battery charging and discharging circuit slowly further includes:
judging the magnitude relation between the battery voltage and the voltage between each level of DC/DC circuit, and calculating the voltage difference between the battery voltage and the voltage between each level of DC/DC circuit;
and if the battery voltage is less than the voltage between the DC/DC circuits at all levels or the voltage difference between the battery voltage and the voltage between the DC/DC circuits at all levels is within the voltage difference range corresponding to the DC/DC circuits at all levels, closing the second switch, and completing the starting of the battery charging and discharging circuit.
In one possible implementation, a DC/DC circuit connected to a DC/AC circuit in the DC/DC unit is referred to as a final DC/DC circuit;
if the direct current bus voltage is not greater than the battery voltage, calculating the voltage difference of each stage of circuit in the battery charging and discharging circuit, and if the voltage difference of each stage of circuit is within the corresponding preset voltage difference range, closing a second switch, wherein the method comprises the following steps:
if the direct current bus voltage is not larger than the battery voltage, calculating a voltage difference between the input voltage of the final DC/DC circuit and the battery voltage and a voltage difference between the direct current bus voltage and the input voltage of the final DC/DC circuit;
if the voltage difference between the input voltage of the final-stage DC/DC circuit and the battery voltage is within a first preset voltage difference range and the voltage difference between the direct-current bus voltage and the input voltage of the final-stage DC/DC circuit is within a second preset voltage difference range, closing a second switch;
wherein, the input/output direction of the final stage DC/DC circuit is according to the input/output direction when the battery discharges.
In one possible implementation manner, a DC/DC circuit connected to a battery in the DC/DC unit is referred to as a primary DC/DC circuit; before calculating a voltage difference between an input voltage of the final stage DC/DC circuit and a battery voltage, and calculating a voltage difference between the direct current bus voltage and the input voltage of the final stage DC/DC circuit, the battery charging and discharging circuit soft start method further includes:
judging whether the input voltage of the final-stage DC/DC circuit is in a preset voltage range or not, and if the input voltage of the final-stage DC/DC circuit is not in the preset voltage range, calculating the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage and the voltage difference between the direct-current bus voltage and the input voltage of the primary DC/DC circuit;
correspondingly, if the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage is within a first preset voltage difference range and the voltage difference between the direct current bus voltage and the input voltage of the primary DC/DC circuit is within a second preset voltage difference range, closing a second switch;
wherein, the input/output direction of the primary DC/DC circuit refers to the input/output direction when the battery is discharged.
In one possible implementation, the first predetermined differential pressure range is the same as the second predetermined differential pressure range.
In one possible implementation manner, the DC/DC unit includes two stages of DC/DC circuits connected in series, and a DC/DC circuit connected to a DC/AC circuit in the DC/DC unit is referred to as a final stage DC/DC circuit; after the direct current bus voltage is judged to be greater than the battery voltage and before the second switch is closed, the battery charging and discharging circuit slow starting method further comprises the following steps:
judging the magnitude relation between the battery voltage and the input voltage of the final-stage DC/DC circuit, and calculating the voltage difference between the battery voltage and the input voltage of the final-stage DC/DC circuit;
if the battery voltage is smaller than the input voltage of the final-stage DC/DC circuit or the voltage difference between the battery voltage and the input voltage of the final-stage DC/DC circuit is within the voltage difference range corresponding to the final-stage DC/DC circuit, closing a second switch, and finishing the starting of the battery charging and discharging circuit;
wherein, the input/output direction of the final stage DC/DC circuit is according to the input/output direction when the battery discharges.
In another aspect of the present invention, a battery charging and discharging circuit slow start device is further provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the battery charging and discharging circuit slow start method when executing the computer program.
In still another aspect of the present invention, there is provided a battery charging and discharging system including: the battery charging and discharging circuit and the battery charging and discharging circuit soft start device are connected.
The battery charging and discharging circuit slow starting method and device and the battery charging and discharging system provided by the invention have the beneficial effects that:
the method comprises the steps of firstly closing a third switch, and when the voltage of a direct current bus is larger than a first preset voltage value, sequentially closing a fourth switch, opening the third switch and closing a first switch, on the basis, judging the magnitude relation between the voltage of the direct current bus and the voltage of a battery, directly closing a second switch when the voltage of the direct current bus is larger than the voltage of the battery, and judging whether to close the second switch according to the voltage difference of circuits at all levels when the voltage of the direct current bus is not larger than the voltage of the battery. That is to say, the invention determines the opening time of each switch by judging the voltage of the direct current bus, the voltage of the battery and the voltage difference of each stage of circuit so as to reduce the influence of impact current on each stage of circuit as much as possible, thereby realizing the slow start of the charge and discharge circuit in a wide voltage range and ensuring the stability of the charge and discharge circuit of the battery.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for starting a battery charging/discharging circuit slowly according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery charging/discharging circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a slow start device of a battery charging/discharging circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery charging/discharging system according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is 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.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The technical scheme adopted by the invention is to provide a battery charging and discharging circuit slow starting method which is applied to a battery charging and discharging circuit 200 shown in figure 2. The battery charging and discharging circuit 200 includes a DC/DC unit 21 and a DC/AC circuit, one side of the DC/DC unit 21 is used for connection with a battery, the other side is connected with a direct current side of the DC/AC circuit, and an alternating current side of the DC/AC circuit is used for connection with a power grid. The DC/DC unit 21 is used for being connected with a first buffer unit 22 in series on a line connected with a battery, the DC/AC circuit is used for being connected with a second buffer unit 23 in series on a line connected with a power grid, the first buffer unit comprises a first buffer resistor R1, a first switch km1 and a second switch km2, and the first buffer resistor R1 is connected with the first switch km1 in series and then connected with the second switch km2 in parallel; the second buffer unit 22 comprises a second buffer resistor R2, a third switch km3 and a fourth switch km4, wherein the second buffer resistor R2 is connected with the third switch km3 in series and then connected with the fourth switch km4 in parallel; the DC/DC unit 21 includes at least one stage of DC/DC circuit connected in series.
On this basis, referring to fig. 1, fig. 1 is a schematic flow chart of a battery charging and discharging circuit slow start method according to an embodiment of the present invention, where the method includes:
s101: and acquiring the voltage of the battery, the voltage between each stage of DC/DC circuit in the DC/DC unit and the voltage of a direct current bus between the DC/DC unit and the DC/AC circuit in real time.
In this embodiment, the voltage between the DC/DC circuits of each stage in the DC/DC unit may be the input voltage corresponding to the DC/DC circuits of each stage, or may be the output voltage corresponding to the DC/DC circuits of each stage.
S102: and if the direct current bus is started from the power grid side, closing the third switch, and closing the fourth switch, opening the third switch and closing the first switch when the direct current bus voltage is greater than a first preset voltage value.
In this embodiment, it may be determined whether starting from the grid side is required, if starting from the grid side is required, the third switch km3 in the second buffer unit 23 is closed, and it is determined whether the voltage of the dc bus detected in real time reaches the first preset voltage value, if it is determined that the voltage of the dc bus detected in real time reaches the first preset voltage value, the fourth switch km4 is sequentially closed, the third switch km3 is opened, and the first switch km1 is closed, on this basis, the closing timing of the second switch km2 is determined according to the voltage of the dc bus, the voltage of the battery, and the voltage between circuits of each stage, and after the second switch km2 is closed, it is determined that starting of the battery charging and discharging circuit is completed.
In this embodiment, the first preset voltage value may be determined according to the grid voltage, for example, the first preset voltage value may be 80% of the grid voltage.
S103: if the voltage of the direct current bus is greater than the voltage of the battery, the second switch is closed, and the battery charging and discharging circuit is started; and if the voltage of the direct current bus is not greater than the voltage of the battery, calculating the differential pressure of each stage of circuit in the battery charging and discharging circuit, and if the differential pressure of each stage of circuit is within the corresponding preset differential pressure range, closing the second switch, and completing the starting of the battery charging and discharging circuit.
In this embodiment, when the dc bus voltage is greater than the battery voltage, the second switch km2 can be directly closed without inrush current in the presence of a diode between the battery and the dc bus. And when the voltage of the direct current bus is not greater than the voltage of the battery, whether the second switch km2 needs to be closed or not is determined according to the voltage difference between circuits of all stages, so that the impact current generated when the switch km2 is closed is ensured to be smaller than the rated discharge current of the battery and the fuse fusing current in a battery charging and discharging circuit. The circuits at each stage comprise a DC/DC circuit and a DC/AC circuit, wherein the voltage corresponding to the circuits at each stage can be represented by the input voltage of the circuits at each stage, and can also be represented by the output voltage of the circuits at each stage.
As can be seen from the foregoing description, different from the prior art, an embodiment of the present invention provides a method for starting a battery charging/discharging circuit slowly, which can support a wide voltage range, that is, first close a third switch, and when a dc bus voltage is greater than a first preset voltage value, sequentially close a fourth switch, open the third switch, and close the first switch, on the basis, determine a magnitude relationship between the dc bus voltage and a battery voltage, directly close a second switch when the dc bus voltage is greater than the battery voltage, and determine whether to close the second switch according to a voltage difference between circuits at different levels when the dc bus voltage is not greater than the battery voltage. That is to say, the embodiment of the invention determines the opening time of each switch by judging the voltage of the direct-current bus, the voltage of the battery and the voltage difference of each stage of circuit, so as to reduce the influence of impact current on each stage of circuit as much as possible, avoid the fuse on the circuit and avoid the large-current damage of the battery, thereby realizing the slow start of the charge and discharge circuit under a wide voltage range and ensuring the stable operation of the charge and discharge circuit of the battery.
In a possible implementation manner, the method for slow start of the battery charging and discharging circuit further includes:
and acquiring the voltage of the battery, and judging whether to start from the power grid side according to the voltage of the battery.
In this embodiment, whether to start from the power grid side may be determined according to the magnitude of the battery voltage, where determining whether to start from the power grid side according to the magnitude of the battery voltage includes:
and if the battery voltage is smaller than a second preset voltage value, judging that the battery is started from the power grid side.
And if the battery voltage is not less than the second preset voltage value, judging to start from the power grid side or the battery side.
In this embodiment, if the battery voltage is low (smaller than the second preset voltage value), the grid-side start is set to avoid battery loss caused by over-discharge of the battery when the battery is started slowly from the battery side. If the battery voltage is not less than the second preset voltage value (i.e. within a preferred voltage range), the battery can be started slowly from the battery side, and the battery can also be started slowly from the power grid side.
In a possible implementation manner, after the determining that the dc bus voltage is greater than the battery voltage and before the closing of the second switch, the method for starting the battery charging and discharging circuit slowly further includes:
and judging the magnitude relation between the battery voltage and the voltage between the DC/DC circuits of all levels, and calculating the voltage difference between the battery voltage and the voltage between the DC/DC circuits of all levels.
And if the battery voltage is less than the voltage between the DC/DC circuits of each stage or the voltage difference between the battery voltage and the voltage between the DC/DC circuits of each stage is within the corresponding voltage difference range of the DC/DC circuits of each stage, closing the second switch, and finishing the starting of the battery charging and discharging circuit.
In the embodiment, in order to further reduce the influence of the inrush current on the battery charging and discharging circuit, whether to close the second switch km2 may be further determined according to the voltage difference between the battery voltage and the voltage between the DC/DC circuits of each stage. The voltages corresponding to the DC/DC circuits of each stage may be represented by the input voltage corresponding to each DC/DC circuit, or may be represented by the output voltage corresponding to each DC/DC circuit.
In one possible implementation, the DC/DC circuit in the DC/DC unit, which is connected to the DC/AC circuit, is denoted as the final DC/DC circuit.
If the direct current bus voltage is not greater than the battery voltage, then calculate the pressure differential of each level circuit in battery charge-discharge circuit, if the pressure differential of each level circuit all is in its corresponding predetermined pressure differential scope, then close the second switch, include:
and if the direct current bus voltage is not greater than the battery voltage, calculating the voltage difference between the input voltage of the final DC/DC circuit and the battery voltage and the voltage difference between the direct current bus voltage and the input voltage of the final DC/DC circuit.
And closing the second switch if the voltage difference between the input voltage of the final-stage DC/DC circuit and the battery voltage is within a first preset voltage difference range and the voltage difference between the direct-current bus voltage and the input voltage of the final-stage DC/DC circuit is within a second preset voltage difference range.
The input/output direction of the final-stage DC/DC circuit is referred to as the input/output direction when the battery is discharged.
In this embodiment, the input/output direction of the DC/DC circuit is defined by the current direction when the battery is discharged (the input/output direction of the DC/DC circuit may also be defined by the current direction when the battery is charged, and the defined direction is related to this embodiment and is not described herein again).
In the present embodiment, it is determined whether or not a voltage difference between the input voltage of the final stage DC/DC circuit and the battery voltage, and a voltage difference between the DC bus voltage and the input voltage of the final stage DC/DC circuit are within a preset voltage difference range, so as to reduce the inrush current as much as possible.
In one possible implementation, the DC/DC circuit connected to the battery in the DC/DC unit is referred to as the primary DC/DC circuit. Before calculating the voltage difference between the input voltage of the final-stage DC/DC circuit and the battery voltage and calculating the voltage difference between the direct-current bus voltage and the input voltage of the final-stage DC/DC circuit, the battery charging and discharging circuit slow starting method further comprises the following steps:
and judging whether the input voltage of the final-stage DC/DC circuit is in a preset voltage range, and if the input voltage of the final-stage DC/DC circuit is not in the preset voltage range, calculating the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage and the voltage difference between the direct-current bus voltage and the input voltage of the primary DC/DC circuit.
Accordingly, the second switch is closed if the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage is within a first predetermined voltage difference range and the voltage difference between the DC bus voltage and the input voltage of the primary DC/DC circuit is within a second predetermined voltage difference range.
The input/output direction of the primary DC/DC circuit is referred to as the input/output direction when the battery is discharged.
In this embodiment, the input voltage of the final stage DC/DC circuit is preferably compared with the DC bus voltage and the battery voltage, but when sampling abnormality occurs (that is, when the input voltage of the final stage DC/DC circuit is not within a preset range), the input voltage of the primary DC/DC circuit is compared with the DC bus voltage and the battery voltage to ensure normal and slow start of the circuit.
In one possible implementation, the first predetermined differential pressure range is the same as the second predetermined differential pressure range.
In one possible implementation, referring to fig. 4, the DC/DC unit includes two stages of DC/DC circuits connected in series, and the DC/DC circuit connected to the DC/AC circuit in the DC/DC unit is referred to as a final stage DC/DC circuit. After the voltage of the direct current bus is judged to be greater than the voltage of the battery and before the second switch is closed, the battery charging and discharging circuit slow starting method further comprises the following steps:
the magnitude relation between the battery voltage and the input voltage of the final-stage DC/DC circuit is judged, and the voltage difference between the battery voltage and the input voltage of the final-stage DC/DC circuit is calculated.
And if the battery voltage is smaller than the input voltage of the final-stage DC/DC circuit or the voltage difference between the battery voltage and the input voltage of the final-stage DC/DC circuit is within the voltage difference range corresponding to the final-stage DC/DC circuit, closing the second switch, and finishing the starting of the battery charging and discharging circuit.
The input/output direction of the final-stage DC/DC circuit is referred to as the input/output direction when the battery is discharged.
In this embodiment, the one-stage DC/DC circuit in fig. 4 is a primary DC/DC circuit described in the embodiment of the present invention, and the two-stage DC/DC circuit in fig. 4 is a final DC/DC circuit described in the embodiment of the present invention.
Specifically, in the example of fig. 4, the magnitude relationship between the battery voltage and the input voltage of the secondary DC/DC circuit may be determined, and the voltage difference between the battery voltage and the input voltage of the secondary DC/DC circuit may be calculated.
And if the battery voltage is smaller than the input voltage of the secondary DC/DC circuit or the voltage difference between the battery voltage and the input voltage of the secondary DC/DC circuit is within the voltage difference range corresponding to the secondary DC/DC circuit, closing the second switch, and finishing the starting of the battery charging and discharging circuit.
Correspondingly, corresponding to the steps in the above embodiments, when the DC bus voltage is not greater than the battery voltage, the voltage difference between the input voltage of the secondary DC/DC circuit and the battery voltage, and the voltage difference between the DC bus voltage and the input voltage of the secondary DC/DC circuit may be calculated.
And closing the second switch if the voltage difference between the input voltage of the secondary DC/DC circuit and the battery voltage is within a first preset voltage difference range and the voltage difference between the direct-current bus voltage and the input voltage of the secondary DC/DC circuit is within a second preset voltage difference range.
Correspondingly, corresponding to the steps in the foregoing embodiment, before calculating a voltage difference between an input voltage of the secondary DC/DC circuit and a battery voltage, and calculating a voltage difference between a DC bus voltage and the input voltage of the secondary DC/DC circuit, the battery charging and discharging circuit slow start method may further include:
and judging whether the input voltage of the secondary DC/DC circuit is in a preset voltage range, and if the input voltage of the secondary DC/DC circuit is not in the preset voltage range, calculating the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage and the voltage difference between the direct-current bus voltage and the input voltage of the primary DC/DC circuit.
Correspondingly, if the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage is within a first preset voltage difference range, and the voltage difference between the direct current bus voltage and the input voltage of the primary DC/DC circuit is within a second preset voltage difference range, the second switch is closed.
That is, when the sampling is abnormal, the input voltage of the first-stage DC/DC circuit can be used to replace the input voltage of the second-stage DC/DC circuit for voltage comparison, so as to ensure that the circuit can be started slowly and smoothly.
In another aspect of the present invention, there is provided a battery charging and discharging circuit slow start device 300, including: one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The processor 301, the input device 302, the output device 303, and the memory 304 are in communication with each other via a communication bus 305. The memory 304 is used to store a computer program comprising program instructions. Processor 301 is operative to execute program instructions stored in memory 304. Wherein the processor 301 is configured to invoke program instructions to perform the steps of the above-described method embodiments. It should be understood that, in the embodiment of the present invention, the processor 301 may be a Central Processing Unit (CPU). The processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The input device 302 may include a touch pad, a fingerprint sensor (for collecting fingerprint information of a user and direction information of the fingerprint), a microphone, etc., and the output device 303 may include a display (LCD, etc.), a speaker, etc. The memory 304 may include a read-only memory and a random access memory, and provides instructions and data to the processor 301. A portion of the memory 304 may also include non-volatile random access memory. For example, the memory 304 may also store device type information. In a specific implementation manner, the processor 301, the input device 302, and the output device 303 described in this embodiment of the present invention may execute the implementation manners described in the first embodiment and the second embodiment of the battery charging and discharging circuit slow start method provided in this embodiment of the present invention.
Referring to fig. 4, in another aspect of the present invention, a battery charging/discharging system 40 is further provided, including:
the above-described battery charging and discharging circuit 200 and the above-described battery charging and discharging circuit soft start device 300 are connected, and the battery charging and discharging circuit 200 is connected with the battery charging and discharging circuit soft start device 300.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A battery charge and discharge circuit slow start method is characterized in that the method is applied to a battery charge and discharge circuit; the battery charging and discharging circuit comprises a DC/DC unit and a DC/AC circuit, wherein one side of the DC/DC unit is used for being connected with a battery, the other side of the DC/DC unit is connected with the direct current side of the DC/AC circuit, and the alternating current side of the DC/AC circuit is used for being connected with a power grid; the DC/DC unit is used for being connected with a battery, a first buffer unit is connected in series on a line, the DC/AC circuit is used for being connected with a power grid, a second buffer unit is connected in series on the line, the first buffer unit comprises a first buffer resistor, a first switch and a second switch, and the first buffer resistor is connected with the first switch in series and then connected with the second switch in parallel; the second buffer unit comprises a second buffer resistor, a third switch and a fourth switch, and the second buffer resistor is connected with the third switch in series and then connected with the fourth switch in parallel; the DC/DC unit includes at least one stage of DC/DC circuit connected in series; the method comprises the following steps:
acquiring battery voltage, voltage between each stage of DC/DC circuit in the DC/DC unit and direct current bus voltage between the DC/DC unit and the DC/AC circuit in real time;
if the direct current bus is started from the power grid side, closing the third switch, and closing the fourth switch, opening the third switch and closing the first switch when the direct current bus voltage is greater than a first preset voltage value;
if the voltage of the direct current bus is greater than the voltage of the battery, closing a second switch, and finishing the starting of the battery charging and discharging circuit;
and if the voltage of the direct current bus is not greater than the voltage of the battery, calculating the differential pressure of each stage of circuit in the battery charging and discharging circuit, and if the differential pressure of each stage of circuit is within the corresponding preset differential pressure range, closing a second switch, and completing the starting of the battery charging and discharging circuit.
2. The battery charging and discharging circuit slow start method according to claim 1, further comprising:
and acquiring the voltage of the battery, and judging whether to start from the power grid side according to the voltage of the battery.
3. The battery charging and discharging circuit slow starting method according to claim 2, wherein the judging whether to start from the power grid side according to the battery voltage comprises:
if the battery voltage is smaller than a second preset voltage value, judging that the battery is started from the power grid side;
and if the battery voltage is not less than a second preset voltage value, judging to start from the power grid side or from the battery side.
4. The battery charging and discharging circuit slow start method according to claim 1, wherein after determining that the dc bus voltage is greater than the battery voltage and before closing the second switch, the method further comprises:
judging the magnitude relation between the battery voltage and the voltage between each level of DC/DC circuit, and calculating the voltage difference between the battery voltage and the voltage between each level of DC/DC circuit;
and if the battery voltage is less than the voltage between the DC/DC circuits at all levels or the voltage difference between the battery voltage and the voltage between the DC/DC circuits at all levels is within the voltage difference range corresponding to the DC/DC circuits at all levels, closing the second switch, and completing the starting of the battery charging and discharging circuit.
5. The battery charging and discharging circuit slow starting method according to claim 1, characterized in that a DC/DC circuit connected to a DC/AC circuit in the DC/DC unit is designated as a final-stage DC/DC circuit;
if the direct current bus voltage is not greater than the battery voltage, calculating the voltage difference of each stage of circuit in the battery charging and discharging circuit, and if the voltage difference of each stage of circuit is within the corresponding preset voltage difference range, closing a second switch, wherein the method comprises the following steps:
if the direct current bus voltage is not larger than the battery voltage, calculating a voltage difference between the input voltage of the final DC/DC circuit and the battery voltage and a voltage difference between the direct current bus voltage and the input voltage of the final DC/DC circuit;
if the voltage difference between the input voltage of the final-stage DC/DC circuit and the battery voltage is within a first preset voltage difference range and the voltage difference between the direct-current bus voltage and the input voltage of the final-stage DC/DC circuit is within a second preset voltage difference range, closing a second switch;
wherein, the input/output direction of the final stage DC/DC circuit is according to the input/output direction when the battery discharges.
6. The battery charging and discharging circuit slow starting method according to claim 5, characterized in that a DC/DC circuit connected with a battery in the DC/DC unit is recorded as a primary DC/DC circuit; before calculating a voltage difference between an input voltage of the final stage DC/DC circuit and a battery voltage, calculating a voltage difference between the direct current bus voltage and an input voltage of the final stage DC/DC circuit, the method further comprises:
judging whether the input voltage of the final-stage DC/DC circuit is in a preset voltage range or not, and if the input voltage of the final-stage DC/DC circuit is not in the preset voltage range, calculating the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage and the voltage difference between the direct-current bus voltage and the input voltage of the primary DC/DC circuit;
correspondingly, if the voltage difference between the input voltage of the primary DC/DC circuit and the battery voltage is within a first preset voltage difference range and the voltage difference between the direct current bus voltage and the input voltage of the primary DC/DC circuit is within a second preset voltage difference range, closing a second switch;
wherein, the input/output direction of the primary DC/DC circuit refers to the input/output direction when the battery is discharged.
7. The battery charging and discharging circuit slow start method according to any one of claims 5 or 6, wherein the first predetermined differential pressure range is the same as the second predetermined differential pressure range.
8. The battery charging and discharging circuit slow starting method according to claim 1, wherein the DC/DC unit includes two stages of DC/DC circuits connected in series, and a DC/DC circuit connected to a DC/AC circuit in the DC/DC unit is denoted as a final stage DC/DC circuit; after the direct current bus voltage is judged to be greater than the battery voltage and before the second switch is closed, the method further comprises the following steps:
judging the magnitude relation between the battery voltage and the input voltage of the final-stage DC/DC circuit, and calculating the voltage difference between the battery voltage and the input voltage of the final-stage DC/DC circuit;
if the battery voltage is smaller than the input voltage of the final-stage DC/DC circuit or the voltage difference between the battery voltage and the input voltage of the final-stage DC/DC circuit is within the voltage difference range corresponding to the final-stage DC/DC circuit, closing a second switch, and finishing the starting of the battery charging and discharging circuit;
wherein, the input/output direction of the final stage DC/DC circuit is according to the input/output direction when the battery discharges.
9. A battery charging and discharging circuit slow start apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 8 when executing the computer program.
10. A battery charge and discharge system, comprising: a battery charging and discharging circuit as claimed in claim 1 and a battery charging and discharging circuit soft start device as claimed in claim 9, the battery charging and discharging circuit being connected to the battery charging and discharging circuit soft start device.
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| CN202111274147.6A CN114156999A (en) | 2021-10-29 | 2021-10-29 | Battery charging and discharging circuit slow starting method and device and battery charging and discharging system |
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