CN115622190B - Mobile energy storage power supply equipment, controller and internal power converter control method thereof - Google Patents
Mobile energy storage power supply equipment, controller and internal power converter control method thereof Download PDFInfo
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- CN115622190B CN115622190B CN202211360039.5A CN202211360039A CN115622190B CN 115622190 B CN115622190 B CN 115622190B CN 202211360039 A CN202211360039 A CN 202211360039A CN 115622190 B CN115622190 B CN 115622190B
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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
- H02J7/007182—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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a mobile energy storage power supply device, a controller and an internal power converter control method thereof, which relate to the field of power supplies, the type of a direct current power supply is judged by monitoring the change of the input voltage of a power converter in the process of increasing the input current of the power converter, different control strategies are adopted correspondingly according to the different types of the direct current power supply, and the change of the input voltage of a second power converter is monitored in the process of increasing the input current of a first power converter so as to judge whether the direct current power supply is homologous or not.
Description
Technical Field
The invention relates to the field of power sources, in particular to a mobile energy storage power source device, a controller and an internal power converter control method thereof.
Background
The mobile energy storage power supply is a small energy storage device which replaces a traditional small fuel generator and is internally provided with a lithium ion battery, has the characteristics of large capacity, high power and safety and portability, can provide a power supply system for stabilizing alternating current/direct current voltage output, has the battery capacity of generally between 100Wh and 3000Wh, is provided with a plurality of output interfaces of AC, DC, type-C, USB, PD and the like, can be matched with main stream electronic equipment on the market, and is suitable for a plurality of scenes such as outdoor play, emergency relief, medical rescue, outdoor operation and the like.
The movable energy storage power supply is mainly used for supplying power to electric equipment or electric tools in outdoor operation when a user travels outdoors. At present, a mobile energy storage power supply presents an explosive growth situation.
The mobile energy storage power supply is provided with a built-in power converter which is used for converting alternating current or direct current into electric energy suitable for charging a built-in battery. Therefore, the mobile energy storage power supply also comprises a direct current input interface for being connected with a direct current power supply and an alternating current input interface for being connected with an alternating current source.
Current common dc power supplies include photovoltaic sources provided by solar panels and constant dc sources. Different direct current power supplies have different characteristics and different control modes are needed for different direct current power supplies.
In addition, in order to reduce the size and cost of the built-in power converters and improve the efficiency thereof, a plurality of power converters are generally built-in, and each power converter is connected with a direct current power supply to supply power to the power converter.
In order to improve the good experience of users, miniaturization, low cost, high efficiency and high reliability are important development trends of mobile energy storage power supplies.
Disclosure of Invention
The application provides a control method of a power converter in a mobile energy storage power supply, which comprises the following steps: s11: sampling an input voltage of the power converter; s12: judging whether the input voltage of the power converter is in the working range, if so, entering a step S13, and if not, continuing to enter the step S11; s13: controlling the input current of the power converter to increase from 0A, sampling and recording the current input voltage of the power converter as an initial input voltage U0; s14: sampling and recording the current input voltage of the power converter as a first input voltage U1 when the input current of the power converter increases to be greater than a threshold value; s15: judging whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is larger than a set threshold value, if so, proceeding to step S16, otherwise, proceeding to step S17; s16: judging that the direct current source is a photovoltaic source, and controlling the power converter by adopting an MPPT algorithm; s17: and judging the direct current source to be a constant direct current source, and controlling the power converter by adopting a constant voltage algorithm.
Further, the portable energy storage power supply is provided with a plurality of power converters, each power converter is configured to receive a direct current output by a direct current power supply, convert the direct current provided by the direct current power supply into electric energy suitable for charging the built-in battery, and further includes: in the process of increasing the input current of a first path of power converters in the plurality of power converters, the change of the input voltage of a second path of power converters in the plurality of power converters is monitored to judge whether the direct current power supply source is homologous.
Still further, still include: s31: controlling the input current of a first path of power converters in the multipath power converters to increase from 0A, sampling and recording the input voltage of a second path of power converters in the current multipath power converters as a second path of initial input voltage Un0; s32: when the input current of the first path of power converter is increased to be more than a threshold value, sampling and recording the current input voltage of the second path of power converter as a second path of first input voltage Un1; s33: judging whether the absolute value of the difference value between the second path first input voltage Un1 and the second path initial input voltage Un0 is larger than a set threshold value, if so, proceeding to step S34, otherwise, proceeding to step S35; s34: determining that the multiple paths of power converters are homologous, and not enabling the second path of power converter; s35: and if the multiple paths of power converters are judged to be different in source, enabling the second path of power converter.
Still further, still include: s41: controlling the input current of a first path of power converters in the multipath power converters to increase from 0A; s42: when the input current of the first path of power converter is increased to be more than a threshold value, sampling and recording that the current input voltage of the first path of power converter is the first path of input voltage Un11, and the input voltage of the second path of power converter in the multi-path power converter is the second path of input voltage Un22; s43: judging whether the second input voltage Un22 is equal to the first input voltage Un11, if so, entering a step S44, otherwise, entering a step S45; s44: determining that the multiple paths of power converters are homologous, and not enabling the second path of power converter; s45: and if the multiple paths of power converters are judged to be different in source, enabling the second path of power converter.
The application also provides a controller, which comprises a sampling unit, a judging unit and a control unit, wherein the sampling unit is used for sampling the input voltage of the power converter in the mobile energy storage power supply, the judging unit is used for receiving the input voltage of the power converter output by the sampling unit, and outputting a command signal according to the input voltage of the power converter; the control unit receives the command signal and outputs a control signal for controlling the power converter according to the command signal, wherein the controller performs the following steps: s21: the sampling unit samples the input voltage of the power converter; s22: the judging unit judges whether the input voltage of the power converter is in the working range or not, and outputs a first instruction signal, if yes, the step S23 is carried out, and if not, the step S21 is carried out continuously; s23: the control unit receives a first command signal, controls the input current of the power converter to increase from 0A according to the first command signal, and the sampling unit samples and records the current input voltage of the power converter as an initial input voltage U0; s24: when the input current of the power converter is increased to be more than a threshold value, the sampling unit samples and records the current input voltage of the power converter as a first input voltage U1; s25: the judging unit receives the first input voltage U1 and the initial input voltage U0, judges whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is larger than a set threshold value, and outputs a second instruction signal, if yes, the step S26 is carried out, and if not, the step S27 is carried out; s26: the control unit receives a second instruction signal, judges that the direct current source is a photovoltaic source according to the second instruction signal, and controls the power converter by adopting an MPPT algorithm; s27: the control unit receives the second instruction signal, judges the direct current source to be a constant direct current source according to the second instruction signal, and controls the power converter by adopting a constant voltage algorithm.
Still further, the controller also performs: in the process that the control unit controls and increases the input current of a first path of power converters in the plurality of power converters, the sampling unit monitors the change of the input voltage of a second path of power converters in the plurality of power converters so that the control unit judges whether the direct current power supply source is homologous.
Further, the controller performs the steps of: s51: the control unit controls the input current of a first path of power converter in the multipath power converters to increase from 0A, and the sampling unit samples and records the input voltage of a second path of power converter in the current multipath power converters as a second path of initial input voltage Un0; s52: when the input current of the first path of power converter is increased to be more than a threshold value, the sampling unit samples and records that the input voltage of the second path of power converter in the current multipath power converter is the second path of first input voltage Un1; s53: the judging unit receives a second path of first input voltage Un1 and a second path of initial input voltage Un0, judges whether the absolute value of the difference value between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is larger than a set threshold value, outputs a third instruction signal, and if yes, goes to step S34, and if not, goes to step S35; s54: the control unit receives a third instruction signal, judges that the multiple paths of power converters are homologous according to the third instruction signal, and does not enable the second path of power converters; s55: the control unit receives the third command signal, judges that the multiple paths of power converters are different in source according to the third command signal, and enables the second path of power converter.
Further, the controller performs the steps of: s61: the control unit controls the input current of a first path of power converter in the multiple paths of power converters to increase from 0A; s62: when the input current of the first path of power converter is increased to be more than a threshold value, the sampling unit samples and records that the current input voltage of the first path of power converter is the first input voltage of the first path, and the input voltage of the second path of power converter in the multi-path power converter is the second first input voltage; s63: the judging unit receives the first path of first input voltage and the second path of first input voltage, judges whether the second path of first input voltage is equal to the first path of first input voltage, outputs a third instruction signal, and if yes, goes to the step S64, and if not, goes to the step S65; s64: the control unit receives a third instruction signal and judges that the multiple paths of power converters are homologous according to the third instruction signal, and the control unit does not enable the second path of power converters; s65: the control unit receives the third command signal and determines that the multiple power converters are different in source according to the third command signal, and then the control unit enables the second power converter.
The application also proposes a mobile energy storage power supply device comprising: each power converter is used for receiving the voltage output by a direct current power supply and converting direct current provided by the direct current power supply into electric energy suitable for charging a built-in battery of the mobile energy storage power supply device; and the controller is connected with the input ends of the plurality of power converters, is used for receiving the input voltages of the plurality of power converters and outputting control signals for controlling the operation of the plurality of power converters according to the input voltages, wherein the controller executes the control method.
Still further, the power converter is a boost converter or a buck converter.
Still further, the power converter isolates the converter from the non-isolated converter.
Still further, the controller is a digital controller or an analog controller.
Drawings
Fig. 1 is a schematic diagram of a first exemplary mobile energy storage power system.
Fig. 2 is a flow chart of a method for controlling a power converter in a mobile energy storage power supply.
Fig. 3 is a schematic diagram of a second exemplary mobile energy storage power system.
Fig. 4 is a flow chart of a method for controlling a power converter in a mobile energy storage power supply.
Fig. 5 is a flow chart of a method for controlling a power converter in a mobile energy storage power supply.
Fig. 6 is a schematic diagram of a controller.
Fig. 7 is a schematic diagram of a mobile energy storage power supply device.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a first exemplary portable power storage system is shown, wherein a power converter, such as the first power converter 110 in fig. 1, is disposed in the portable power storage power supply 10 for receiving a voltage output from a dc power supply, and converting dc power provided by the dc power supply into electric energy suitable for charging a built-in battery. As shown in fig. 1, the dc power supply is a first dc source 21. Fig. 1 shows only a partial structure of the mobile energy storage power supply 10, but it can of course also be configured with other structures.
Current common dc power supplies include photovoltaic sources provided by solar panels and constant dc sources. The characteristics of different direct current power supplies are different, the types of the direct current power supplies need to be identified, and different control modes are adopted for the different direct current power supplies.
Based on the first exemplary portable energy storage power system shown in fig. 1, an embodiment of the present application provides a method for controlling a power converter in a portable energy storage power supply 10. The control method provided by the application adopts corresponding different control strategies based on different photovoltaic sources and constant direct current sources provided by the solar panel. Specifically, referring to a flowchart of a method for controlling a power converter in a mobile energy storage power supply shown in fig. 2, the method includes:
s11: sampling an input voltage of the power converter;
s12: judging whether the input voltage of the power converter is in the working range, if so, entering a step S13, and if not, continuing to enter the step S11;
s13: controlling the input current of the power converter to increase from 0A, sampling and recording the current input voltage of the power converter as an initial input voltage U0;
s14: sampling and recording the current input voltage of the power converter as a first input voltage U1 when the input current of the power converter increases to be greater than a threshold value;
s15: judging whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is larger than a set threshold value, if so, proceeding to step S16, otherwise, proceeding to step S17;
s16: judging that the direct current source is a photovoltaic source, and controlling the power converter by adopting an MPPT (Maximum Power Point Tracking maximum power point tracking) algorithm;
s17: and judging the direct current source to be a constant direct current source, and controlling the power converter by adopting a constant voltage algorithm.
For a photovoltaic source, its output voltage decreases as its output current increases. For a constant direct current source, its output voltage does not change as its output current changes, i.e. its output voltage is constant. Of course, the constant here may deviate somewhat. As can be seen, the output voltage of different dc power supplies varies with the characteristics of the output current conversion.
By monitoring the change in the input voltage of the power converter, i.e. the output voltage of the dc supply, during an increase of the input current of the power converter, i.e. the output current of the dc supply. When the output current of the direct current power supply is increased from 0A to be more than a threshold value, if the reduction of the output voltage of the direct current power supply relative to the output voltage of the direct current power supply corresponding to the output current of the direct current power supply being 0A is more than a certain value, the direct current power supply accords with the characteristics of the photovoltaic source, and the direct current power supply is judged to be the photovoltaic source; if the output voltage of the dc power supply is substantially unchanged, i.e., not reduced, relative to the output voltage of the corresponding dc power supply when the output current of the dc power supply is 0A, it is determined that the dc power supply is a constant dc source by indicating that the dc power supply corresponds to the characteristic of a constant dc source. Therefore, the type of the direct current power supply can be accurately judged, the judging method is simple, no additional device is needed, and the cost is low.
In order to increase the rate of battery charging built into the portable energy storage power supply, it is desirable that the portable energy storage power supply system operate in a maximum power output, i.e., the power converter within the portable energy storage power supply 10 is operating in a maximum output power mode.
When the direct current power supply is judged to be a constant direct current source, a constant voltage algorithm is adopted to control a power converter in the movable energy storage power supply, so that the power converter operates in a maximum output power mode. The constant voltage algorithm calculates the duty ratio of a switching tube in the power converter corresponding to the operation of the power converter in a maximum output power mode according to the input voltage of the power converter, and then controls the switching tube in the power converter to be turned on/off according to the duty ratio, so that the power converter can rapidly work in the maximum output power mode, the response speed of the power converter is high, and the charging efficiency of a battery built in the mobile energy storage power supply is high.
When the direct current power supply is judged to be a photovoltaic source, the MPPT algorithm is adopted to control the power converter in the mobile energy storage power supply, so that the power converter operates in a maximum output power mode. The output power of the photovoltaic power supply is related to the operating voltage of the power converter, and only if the power converter is operated at the most suitable voltage will the output power of the photovoltaic power supply have a unique maximum value. The MPPT algorithm tracks the maximum output power of the power converter by changing the duty ratio of a switching tube in the power converter, if the duty ratio of the switching tube is increased, if the output power of the power converter is increased, the duty ratio of the switching tube is continuously increased, and if the output power is reduced, the duty ratio of the switching tube is reduced, so that the power converter works in the maximum output power mode by continuous optimizing. And the maximum output power of the photovoltaic power supply is not fixed, so that the duty ratio disturbance is added intermittently to find the real maximum power point.
The constant voltage algorithm and the MPPT algorithm are common general knowledge in the industry and will not be described in detail herein.
The type of the direct current power supply is judged by the method, and then different control modes are adopted according to the type of the direct current power supply, so that the direct current power supply outputs maximum power, namely, the power converter built-in the mobile energy storage power supply operates in a maximum output power mode, the response speed of the power converter built-in the mobile energy storage power supply is improved, and the charging efficiency of the built-in battery of the mobile energy storage power supply is improved.
In order to reduce the size and cost of the built-in power converters of the mobile energy storage power supply and improve the efficiency of the power converters, a plurality of power converters are generally built in. Referring to a second exemplary portable power storage system shown in fig. 3, the portable power storage power supply 10 has a plurality of power converters, such as the first power converter 110 to the n-th power converter 1n0 in fig. 3, each for receiving a dc power output from a dc power supply, and converting the dc power provided by the dc power supply into electric energy suitable for charging the internal battery, such as the first dc source 21 to the n-th dc source 2n in fig. 3, respectively.
When the first dc source 21 to the nth dc source 2n are all the use scenes of the photovoltaic source, this is also a conventional scene of outdoor use of the mobile energy storage power source. In order to avoid the situation that the power converters cannot work normally when a user uses a group of photovoltaic sources to provide input sources for a plurality of power converters simultaneously. When the mode is adopted to judge that the direct current source is a photovoltaic source, whether the multiple paths of power converters are powered by the same group of photovoltaic sources, namely whether the multiple paths of power converters are homologous or not is judged.
Specifically, as shown in fig. 3, the output ends of the multiple paths of power converters share the BAT-battery ground, and the current of one path of power converter also passes through the sampling resistor of the other path of power converter, because the current is split, the current sampling value of the path of power converter is smaller, when the current sampling signal is smaller, the target current of the controller remains unchanged, the current actually flowing through the switching tube in the path of power converter is necessarily larger than the target current, and the heating value of the switching tube in the path of power converter is large, so that the switching tube in the path of power converter can be burnt due to overheating after a period of operation. It is therefore desirable to avoid the use of a set of photovoltaic sources to power multiple power converters simultaneously.
Further, referring to the flowchart of the method for controlling the power converter in the mobile energy storage power supply shown in fig. 4, when the plurality of direct current sources are photovoltaic sources, the method for controlling the power converter in the mobile energy storage power supply further includes:
s31: controlling the input current of a first path of power converters in the multipath power converters to increase from 0A, sampling and recording the input voltage of a second path of power converters in the current multipath power converters as a second path of initial input voltage Un0;
s32: when the input current of the first path of power converter is increased to be more than a threshold value, sampling and recording the current input voltage of the second path of power converter as a second path of first input voltage Un1;
s33: judging whether the absolute value of the difference value between the second path first input voltage Un1 and the second path initial input voltage Un0 is larger than a set threshold value, if so, proceeding to step S34, otherwise, proceeding to step S35;
s34: determining that the multiple paths of power converters are homologous, and not enabling the second path of power converter;
s35: and if the multiple paths of power converters are judged to be different in source, enabling the second path of power converter.
In this way, the change of the input voltage of the second path of power converter is monitored in the process of increasing the input current of the first path of power converter, and when the input voltage of the second path of power converter is reduced, the homology of the direct current power supply is indicated, so that the efficiency of the mobile energy storage power supply system is improved to avoid homology faults, and the second path of power converter is not enabled; when the input voltage of the second path of power converter is not reduced, the direct current power supply is not homologous, and the second path of power converter can be enabled, and the multiple paths of converters work simultaneously. Therefore, the fault caused by homology can be avoided, the judging method is simple, no additional device is needed, and the cost is low.
Referring to the flow chart of the method for controlling the power converter in the mobile energy storage power supply shown in fig. 5, when the plurality of direct current sources are photovoltaic sources, the method for controlling the power converter in the mobile energy storage power supply may further include:
s41: controlling the input current of a first path of power converters in the multipath power converters to increase from 0A;
s42: when the input current of the first path of power converter is increased to be more than a threshold value, sampling and recording that the current input voltage of the first path of power converter is the first path of input voltage Un11, and the input voltage of the second path of power converter in the multi-path power converter is the second path of input voltage Un22;
s43: judging whether the second input voltage Un22 is equal to the first input voltage Un11, if so, entering a step S44, otherwise, entering a step S45;
s44: determining that the multiple paths of power converters are homologous, and not enabling the second path of power converter;
s45: and if the multiple paths of power converters are judged to be different in source, enabling the second path of power converter.
In this way, in the process of increasing the input current of the first path of power converter, the change of the input voltages of the first path of power converter and the second path of power converter is monitored, when the input voltage of the second path of power converter is reduced along with the first path of power converter, the homology of the direct current power supply is indicated, and in order to avoid the homology fault, the efficiency of the mobile energy storage power supply system is improved, and the second path of power converter is not enabled; when the input voltage of the second path of power converter is not reduced along with the first path of power converter, the direct current power supply is not homologous, and the second path of power converter can be enabled, and the multiple paths of converters work simultaneously. Therefore, the fault caused by homology can be avoided, the judging method is simple, no additional device is needed, and the cost is low.
Therefore, in the process of increasing the input current of the first path of power converter, the two methods monitor the change of the input voltage of the second path of power converter to judge whether the direct current power supply source is homologous.
Therefore, the type of the direct current source can be judged firstly, so that the power converter works in a maximum output power mode by adopting a corresponding control mode, when the mobile energy storage power supply is internally provided with a plurality of paths of power converters and the direct current sources of the paths of power converters are all photovoltaic sources, whether the plurality of direct current sources are homologous is judged, if the direct current sources are homologous, only one path works, and if the direct current sources are different, the paths work together. Therefore, the power converter can work in a maximum output power mode rapidly, the charging efficiency is improved, and the reliability of the movable energy storage power supply is high.
In an embodiment of the present application, referring to the schematic controller shown in fig. 6, the controller 300 includes a sampling unit 310, a judging unit 320 and a control unit 330, wherein the sampling unit 310 is configured to sample an input voltage of a power converter in the mobile energy storage power supply, the judging unit 320 is configured to receive the input voltage of the power converter output by the sampling unit 310, and output a command signal according to the input voltage of the power converter; the control unit 330 receives the command signal and outputs a control signal for controlling the power converter according to the command signal, wherein the controller 300 performs the steps of:
s21: sampling unit 310 samples the input voltage of the power converter;
s22: the judging unit 320 judges whether the input voltage of the power converter is within the working range, outputs a first command signal, if yes, proceeds to step S23, otherwise proceeds to step S21;
s23: the control unit 330 receives the first command signal, controls the input current of the power converter to increase from 0A according to the first command signal, and the sampling unit 310 samples and records the current input voltage of the power converter as an initial input voltage U0;
s24: when the input current of the power converter increases to be greater than a threshold value, the sampling unit 310 samples and records the current input voltage of the power converter as the first input voltage U1;
s25: the judging unit 320 receives the first input voltage U1 and the initial input voltage U0, judges whether the absolute value of the difference between the first input voltage U1 and the initial input voltage U0 is greater than a set threshold, and outputs a second instruction signal, if yes, the step S26 is entered, and if no, the step S27 is entered;
s26: the control unit 330 receives the second instruction signal, determines that the direct current source is a photovoltaic source according to the second instruction signal, and controls the power converter by adopting an MPPT (Maximum Power Point Tracking ) algorithm;
s27: the control unit 330 receives the second command signal, determines that the direct current source is a constant direct current source according to the second command signal, and controls the power converter using a constant voltage algorithm.
Still further, the controller 300 performs the following steps:
s51: the control unit 330 controls the input current of the first power converter of the multiple power converters to increase from 0A, and the sampling unit 310 samples and records the input voltage of the second power converter of the current multiple power converters as the second initial input voltage Un0;
s52: when the input current of the first path of power converter increases to be greater than a threshold value, the sampling unit 310 samples and records the input voltage of the second path of power converter in the current multipath power converter as the second path of first input voltage Un1;
s53: the judging unit 320 receives the second first input voltage Un1 and the second initial input voltage Un0, judges whether the absolute value of the difference between the second first input voltage Un1 and the second initial input voltage Un0 is greater than a set threshold, and outputs a third command signal, if yes, it goes to step S34, if no, it goes to step S35;
s54: the control unit 330 receives the third command signal, and determines that the multiple power converters are homologous according to the third command signal, and the control unit 330 does not enable the second power converter;
s55: the control unit 330 receives the third command signal, determines that the multiple power converters are different sources according to the third command signal, and then the control unit 330 enables the second power converter.
Still further, the controller 300 performs the following steps:
s61: the control unit 330 controls the input current of the first power converter of the multiple power converters to increase from 0A;
s62: when the input current of the first path of power converter increases to be greater than a threshold value, the sampling unit 310 samples and records that the current input voltage of the first path of power converter is the first path of first input voltage Un11, and the input voltage of the second path of power converter in the multi-path of power converter is the second path of first input voltage Un1;
s63: the judging unit 320 receives the first path first input voltage Un11 and the second path first input voltage Un1, judges whether the second path first input voltage Un1 is equal to the first path first input voltage Un11, and outputs a third instruction signal, if yes, it goes to step S64, if no, it goes to step S65;
s64: the control unit 330 receives the third command signal and determines that the multiple power converters are homologous according to the third command signal, and the control unit 330 does not enable the second power converter;
s65: the control unit 330 receives the third command signal and determines that the multiple power converters are different sources according to the third command signal, and the control unit 330 enables the second power converter.
The second power converter may include only one power converter, such as the first power converter 110 in fig. 3 is a first power converter, and the second power converter 120 is a second power converter.
The second power converter may include only a plurality of power converters, such as the first power converter 110 in fig. 3 is a first power converter, and the second power converters 120 to 1n0 form a second power converter.
In an embodiment of the present application, referring to fig. 7, a portable energy storage power device is also provided, and the portable energy storage power device 10 includes:
a plurality of power converters, each power converter being configured to receive a voltage output by a dc power supply, and convert dc power provided by the dc power supply into electrical energy suitable for charging the built-in battery 400 of the portable energy storage power supply device;
the controller 300 is connected to the input ends of the power converters, and is configured to receive the input voltages of the power converters, and output control signals for controlling the operation of the power converters according to the input voltages, where the controller 300 executes the method for controlling the power converters in the mobile energy storage power supply.
The principle and advantages are the same as the control method of the power converter in the mobile energy storage power supply, and are not repeated here.
As shown in fig. 3, the plurality of power converters include a first power converter 110 to an nth power converter 1n0, and a plurality of dc power supplies, which are respectively a first dc source 21 to an nth dc source 2n, and the first power converter 110 to the nth power converter 1n0 respectively receive the dc power provided by the first dc source 21 to the nth dc source 2n one by one.
In one embodiment, the power converter is a boost converter or a buck converter. Further, the power converter is an isolated converter or a non-isolated converter.
In one embodiment, the controller is a digital controller, such as a DSP. Of course, the controller described above may also be implemented by an analog circuit.
The threshold may be set according to actual design requirements.
Finally, it should be explained that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The method for controlling the power converter in the mobile energy storage power supply is characterized by comprising the following steps of:
s11: sampling an input voltage of the power converter;
s12: judging whether the input voltage of the power converter is in the working range, if so, entering a step S13, and if not, continuing to enter the step S11;
s13: controlling the input current of the power converter to increase from 0A, sampling and recording the current input voltage of the power converter as an initial input voltage U0;
s14: sampling and recording the current input voltage of the power converter as a first input voltage U1 when the input current of the power converter increases to be greater than a threshold value;
s15: judging whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is larger than a set threshold value, if so, proceeding to step S16, otherwise, proceeding to step S17;
s16: judging that the direct current source is a photovoltaic source, and controlling the power converter by adopting an MPPT algorithm;
s17: the direct current source is judged to be a constant direct current source, a constant voltage algorithm is adopted to control the power converter,
wherein portable energy storage power supply embeds a plurality of power converters, and each power converter is used for receiving the direct current that a direct current power supply output, and the direct current that will direct current power supply provided is transformed into the electric energy that is applicable to for built-in battery charging, still includes: in a process of increasing an input current of a first power converter of the plurality of power converters, monitoring a change in an input voltage of a second power converter of the plurality of power converters to determine whether a dc power supply source is homologous, comprising:
s31: controlling the input current of a first path of power converters in the multipath power converters to increase from 0A, sampling and recording the input voltage of a second path of power converters in the current multipath power converters as a second path of initial input voltage Un0;
s32: when the input current of the first path of power converter is increased to be more than a threshold value, sampling and recording the current input voltage of the second path of power converter as a second path of first input voltage Un1;
s33: judging whether the absolute value of the difference value between the second path first input voltage Un1 and the second path initial input voltage Un0 is larger than a set threshold value, if so, proceeding to step S34, otherwise, proceeding to step S35;
s34: determining that the multiple paths of power converters are homologous, and not enabling the second path of power converter;
s35: and if the multiple paths of power converters are judged to be different in source, enabling the second path of power converter.
2. The method of claim 1, further comprising:
s41: controlling the input current of a first path of power converters in the multipath power converters to increase from 0A;
s42: when the input current of the first path of power converter is increased to be more than a threshold value, sampling and recording that the current input voltage of the first path of power converter is the first path of input voltage Un11, and the input voltage of the second path of power converter in the multi-path power converter is the second path of input voltage Un22;
s43: judging whether the second input voltage Un22 is equal to the first input voltage Un11, if so, entering a step S44, otherwise, entering a step S45;
s44: determining that the multiple paths of power converters are homologous, and not enabling the second path of power converter;
s45: and if the multiple paths of power converters are judged to be different in source, enabling the second path of power converter.
3. The controller is characterized by comprising a sampling unit, a judging unit and a control unit, wherein the sampling unit is used for sampling the input voltage of a power converter in the mobile energy storage power supply, the judging unit is used for receiving the input voltage of the power converter output by the sampling unit, and outputting a command signal according to the input voltage of the power converter; the control unit receives the command signal and outputs a control signal for controlling the power converter according to the command signal, wherein the controller performs the following steps:
s21: the sampling unit samples the input voltage of the power converter;
s22: the judging unit judges whether the input voltage of the power converter is in the working range or not, and outputs a first instruction signal, if yes, the step S23 is carried out, and if not, the step S21 is carried out continuously;
s23: the control unit receives a first command signal, controls the input current of the power converter to increase from 0A according to the first command signal, and the sampling unit samples and records the current input voltage of the power converter as an initial input voltage U0;
s24: when the input current of the power converter is increased to be more than a threshold value, the sampling unit samples and records the current input voltage of the power converter as a first input voltage U1;
s25: the judging unit receives the first input voltage U1 and the initial input voltage U0, judges whether the absolute value of the difference value between the first input voltage U1 and the initial input voltage U0 is larger than a set threshold value, and outputs a second instruction signal, if yes, the step S26 is carried out, and if not, the step S27 is carried out;
s26: the control unit receives a second instruction signal, judges that the direct current source is a photovoltaic source according to the second instruction signal, and controls the power converter by adopting an MPPT algorithm;
s27: the control unit receives the second instruction signal, judges the direct current source to be a constant direct current source according to the second instruction signal, adopts a constant voltage algorithm to control the power converter,
wherein the controller further performs: in the process that the control unit controls and increases the input current of a first path of power converters in the plurality of power converters, the sampling unit monitors the change of the input voltage of a second path of power converters in the plurality of power converters so that the control unit judges whether the direct current power supply source is homologous or not, and the controller executes the following steps:
s51: the control unit controls the input current of a first path of power converter in the multipath power converters to increase from 0A, and the sampling unit samples and records the input voltage of a second path of power converter in the current multipath power converters as a second path of initial input voltage Un0;
s52: when the input current of the first path of power converter is increased to be more than a threshold value, the sampling unit samples and records that the input voltage of the second path of power converter in the current multipath power converter is the second path of first input voltage Un1;
s53: the judging unit receives a second path of first input voltage Un1 and a second path of initial input voltage Un0, judges whether the absolute value of the difference value between the second path of first input voltage Un1 and the second path of initial input voltage Un0 is larger than a set threshold value, outputs a third instruction signal, and if yes, goes to step S34, and if not, goes to step S35;
s54: the control unit receives a third instruction signal, judges that the multiple paths of power converters are homologous according to the third instruction signal, and does not enable the second path of power converters;
s55: the control unit receives the third command signal, judges that the multiple paths of power converters are different in source according to the third command signal, and enables the second path of power converter.
4. A controller according to claim 3, wherein the controller performs the steps of:
s61: the control unit controls the input current of a first path of power converter in the multiple paths of power converters to increase from 0A;
s62: when the input current of the first path of power converter is increased to be more than a threshold value, the sampling unit samples and records that the current input voltage of the first path of power converter is the first input voltage of the first path, and the input voltage of the second path of power converter in the multi-path power converter is the second first input voltage;
s63: the judging unit receives the first path of first input voltage and the second path of first input voltage, judges whether the second path of first input voltage is equal to the first path of first input voltage, outputs a third instruction signal, and if yes, goes to the step S64, and if not, goes to the step S65;
s64: the control unit receives a third instruction signal and judges that the multiple paths of power converters are homologous according to the third instruction signal, and the control unit does not enable the second path of power converters;
s65: the control unit receives the third command signal and determines that the multiple power converters are different in source according to the third command signal, and then the control unit enables the second power converter.
5. A mobile energy storage power supply device, comprising:
each power converter is used for receiving the voltage output by a direct current power supply and converting direct current provided by the direct current power supply into electric energy suitable for charging a built-in battery of the mobile energy storage power supply device;
a controller connected to the input terminals of the power converters for receiving the input voltages of the power converters and outputting control signals for controlling the operation of the power converters according to the input voltages, wherein the controller performs the control method of claim 1 or 2.
6. The mobile energy storage power supply device of claim 5, wherein the power converter is a boost converter or a buck converter.
7. The mobile energy storage power supply device of claim 6, wherein the power converter isolates the converter from the non-isolated converter.
8. The mobile energy storage power device of claim 5, wherein the controller is a digital controller or an analog controller.
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| CN114430188A (en) * | 2021-12-22 | 2022-05-03 | 深圳市正浩创新科技股份有限公司 | Power supply device identification method, electronic device and storage medium |
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| CN104868495A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Input source intelligent identification method applied to new energy hybrid inverter |
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