CN112039060B - Control method and device applied to power supply circuit, terminal and storage medium - Google Patents
Control method and device applied to power supply circuit, terminal and storage medium Download PDFInfo
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- CN112039060B CN112039060B CN202010844310.7A CN202010844310A CN112039060B CN 112039060 B CN112039060 B CN 112039060B CN 202010844310 A CN202010844310 A CN 202010844310A CN 112039060 B CN112039060 B CN 112039060B
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention is suitable for the technical field of power supply control, and provides a control method, a device, a terminal and a storage medium applied to a power supply circuit, wherein the control method comprises the following steps: when the power supply circuit supplies power to the commercial power and the direct-current power supply at the same time, the duty ratio of the PFC is obtained in real time; determining whether the duty cycle of the PFC is less than or equal to a first preset value; if the duty ratio of the PFC is smaller than or equal to a first preset value, a first control instruction is sent to the power supply circuit; the first control instruction is used for indicating the power supply circuit to be switched to be supplied with the mains supply independently. The invention can not only prolong the service life of the direct current power supply and ensure the uninterrupted power supply of the load, but also ensure that the switched commercial power has independent power supply capacity, thus being beneficial to matching with the load; and the stable operation of the system can be ensured under the conditions that the bus capacitance of the power supply circuit is small and the three phases have unbalanced loads.
Description
Technical Field
The invention belongs to the technical field of power supply control, and particularly relates to a control method and device applied to a power supply circuit, a terminal and a storage medium.
Background
The existing control method for realizing the uninterrupted power supply of the load by the power supply circuit has the advantages that when the mains supply is normal, the mains supply supplies power to the load, the storage battery does not supply power, and when the mains supply is abnormal, the storage battery supplies power to the load, so that the aim of ensuring the normal power supply of the load can be fulfilled.
The inventor finds that when the power supply circuit is applied to the power supply circuit, if the controller uses the combination of the commercial power and the direct-current power supply to supply power to the load, namely the commercial power is used to supply power to the load when the commercial power is normal; when the commercial power is abnormal, the commercial power and the direct-current power supply are used for supplying power jointly according to the condition of the commercial power, and the ratio of the commercial power to the direct-current power supply is adjusted, so that the uninterrupted power supply of the load can be better realized, the power supply cost is reduced, and the service life of the direct-current power supply is prolonged. However, there is a lack in the prior art of an efficient method of switching the joint supply to the mains supply alone.
If the existing switching means for switching the power supply of the storage battery to the power supply of the commercial power is considered, the voltage of the detection bus is easily increased, and the voltage of the detection bus is quickly switched to the power supply of the commercial power when the voltage of the detection bus is increased, so that the service life of the storage battery is prolonged, and the load is ensured not to be powered off. However, the control method is not accurate, and cannot ensure that the mains supply has the capability of independent power supply when the mains supply is switched back to the mains supply, which is not beneficial to matching with the load; and when the bus capacitor is small, and the three-phase belt is unbalanced in load, the bus has large ripples, the bus voltage can fluctuate, and the frequent switching between the commercial power and the combined power supply can be caused at the moment, so that the stable operation of the system is not favorably ensured.
Disclosure of Invention
In view of this, embodiments of the present invention provide a control method, an apparatus, a terminal and a storage medium for a power supply circuit, so as to solve the problem that a method for switching a combined power supply to a single power supply of a utility power supply is absent in the prior art, and it is not possible to ensure that the utility power has a single power supply capability after switching and ensure stable operation of a system.
A first aspect of an embodiment of the present invention provides a control method applied to a power supply circuit, where the power supply circuit includes: the power supply circuit comprises a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the input end of an inverter through the bus; the output end of the inverter is used for connecting a load; the first power supply circuit is provided with a PFC; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC; the second power supply circuit transmits the electric energy of the direct current power supply to the bus;
the control method comprises the following steps:
when the power supply circuit supplies power to the commercial power and the direct-current power supply at the same time, the duty ratio of the PFC is obtained in real time;
determining whether the duty cycle of the PFC is less than or equal to a first preset value;
if the duty ratio of the PFC is smaller than or equal to a first preset value, a first control instruction is sent to the power supply circuit; the first control instruction is used for indicating the power supply circuit to be switched to be supplied with the mains supply independently.
Optionally, the obtaining the duty ratio of the PFC in real time includes:
acquiring integral quantity in real time through integral control of PFC;
calculating a duty cycle of the PFC based on the integral amount.
Optionally, if the duty ratio of the PFC is less than or equal to a first preset value, sending a first control instruction to the power supply circuit includes:
and if the duty ratio of the PFC is smaller than or equal to a first preset value and the time that the duty ratio of the PFC is smaller than the first preset value lasts for a first preset time, sending a first control instruction to the power supply circuit.
Optionally, the control method further includes:
if the duty ratio of the PFC is larger than a first preset value and smaller than a second preset value, acquiring the output current of the direct-current power supply in real time;
determining whether the output current of the direct current power supply is smaller than a preset current or not;
and if the output current of the direct current power supply is smaller than the preset current, sending a first control instruction to the power supply circuit.
Optionally, if the output current of the dc power supply is smaller than the preset current, a first control instruction is sent to the power supply circuit, including:
and if the output current of the direct current power supply is smaller than the preset current and the time that the output current of the direct current power supply is smaller than the preset current lasts for a second preset time, sending a first control instruction to the power supply circuit.
Optionally, the control method further includes:
when the power supply circuit supplies power for the mains supply independently, acquiring the bus voltage of the power supply circuit in real time;
determining whether the bus voltage is less than a first preset voltage;
if the bus voltage is smaller than the first preset voltage, sending a second control instruction to the power supply circuit;
the second control instruction is used for indicating the power supply circuit to be switched to a commercial power supply and a direct-current power supply to supply power simultaneously.
Optionally, if the bus voltage is less than the first preset voltage, sending a second control instruction to the power supply circuit includes:
and if the bus voltage is less than the first preset voltage and the time that the bus voltage is less than the first preset voltage lasts for a third preset time, sending the second control instruction to the power supply circuit.
A second aspect of an embodiment of the present invention provides a control apparatus applied to a power supply circuit, where the power supply circuit includes: the power supply circuit comprises a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the input end of an inverter through the bus; the output end of the inverter is used for connecting a load; the first power supply circuit is provided with a PFC; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC; the second power supply circuit transmits the electric energy of the direct current power supply to the bus;
the control device includes:
the acquisition module is used for acquiring the duty ratio of the PFC in real time when the power supply circuit supplies power to the commercial power and the direct-current power supply simultaneously;
the first judgment module is used for determining whether the duty ratio of the PFC is smaller than or equal to a first preset value;
the first control module is used for sending a first control instruction to the power supply circuit if the duty ratio of the PFC is smaller than or equal to a first preset value; the first control instruction is used for indicating the power supply circuit to be switched to be supplied with the mains supply independently.
A third aspect of the embodiments of the present invention provides a terminal device, including 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 control method applied to the power supply circuit, when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the control method applied to the power supply circuit, as provided in the first aspect of the embodiments of the present invention.
The embodiment of the invention provides a control method applied to a power supply circuit, which comprises the following steps: when the power supply circuit supplies power to the commercial power and the direct-current power supply at the same time, the duty ratio of the PFC is obtained in real time; determining whether the duty cycle of the PFC is less than or equal to a first preset value; if the duty ratio of the PFC is smaller than or equal to a first preset value, a first control instruction is sent to the power supply circuit; the first control instruction is used for indicating the power supply circuit to be switched to be supplied with the mains supply independently. According to the embodiment of the invention, the duty ratio of the PFC is directly detected to determine whether the state of the commercial power has the independent power supply capability, and when the duty ratio of the PFC is smaller than or equal to a first preset value, the commercial power and the direct-current power supply are immediately switched to supply power for the commercial power independently in a combined power supply mode. The method can prolong the service life of the direct-current power supply, ensure that the load is not powered off, ensure that the switched commercial power has independent power supply capacity and is beneficial to matching with the load; meanwhile, the problem that when a voltage detection method is used, due to the fact that the bus capacitance is small, when three-phase loads are unbalanced, bus voltage fluctuates due to the fact that bus ripple is greatly influenced, and therefore frequent switching between commercial power and combined power supply is caused can be solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in 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 based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a control method applied to a power supply circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control device applied to a power supply circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The embodiment of the invention provides a control method applied to a power supply circuit, and the power supply circuit is shown in figure 1 and comprises the following steps:
the power supply circuit comprises a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the input end of an inverter through the bus; the output end of the inverter is used for connecting a load; the first power supply circuit is provided with a PFC; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC; the second power supply circuit transmits electric energy of a direct current power supply to the bus.
In the embodiment of the present invention, the PFC (Power Factor Correction) refers to a Power Factor Correction circuit, and may be understood as a rectifier with control.
The flow chart of the control method is shown in fig. 2, and includes:
step S101: and when the power supply circuit supplies power to the commercial power and the direct-current power supply at the same time, the duty ratio of the PFC is acquired in real time.
The embodiment of the invention is applied to a power supply circuit for supplying power to a load by combining commercial power and a direct-current power supply, in the power supply circuit, a transmission line of the commercial power can be connected in parallel with a first power supply branch formed by a PFC (power factor correction) and a second power supply branch formed by an output line of the direct-current power supply to form a bus, and a bus capacitor is arranged between the buses; and an inversion module is arranged and connected with the output of the bus, and the output of the inversion module is connected with a load.
Step S102: determining whether the duty cycle of the PFC is less than or equal to a first preset value.
In the embodiment of the invention, whether the commercial power has the independent power supply capacity or not is judged according to the duty ratio of the PFC. The utility power, the direct current power and the bus power are balanced, when the duty ratio of the PFC is fully opened, the PFC needs to be fully powered to supply power to the bus, and whether the PFC has the capability of independently supplying power to the load is difficult to judge. When the duty ratio of the PFC is smaller and is only switched to a first preset value or smaller than the first preset value, indicating that the PFC starts to desaturate, and determining that the commercial power has the independent power supply capacity; the duty ratio of the PFC is smaller than or equal to 1, and the first preset value is smaller than 1.
Step S103: if the duty ratio of the PFC is smaller than or equal to a first preset value, a first control instruction is sent to the power supply circuit; the first control instruction is used for indicating the power supply circuit to be switched to be supplied with the mains supply independently.
According to the embodiment of the invention, the duty ratio of the PFC is directly detected to determine whether the state of the commercial power has the independent power supply capability, and when the duty ratio of the PFC is smaller than or equal to a first preset value, the commercial power and the direct-current power supply are immediately switched to supply power for the commercial power independently in a combined power supply mode. The service life of the direct-current power supply can be prolonged, the load is ensured not to be powered off, and the switched commercial power can be ensured to have independent power supply capacity, so that the matching with the load is facilitated; meanwhile, the problem that when a voltage detection method is used, due to the fact that the bus capacitance is small, when three-phase loads are unbalanced, bus voltage fluctuates due to the fact that bus ripple is greatly influenced, and therefore frequent switching between commercial power and combined power supply is caused can be solved.
In some embodiments, obtaining the duty cycle of the PFC in real time may include: acquiring integral quantity in real time through integral control of PFC; calculating a duty cycle of the PFC based on the integral amount.
In the embodiment of the invention, the PFC is provided with integral control, and the integral quantity can be used as the given duty ratio to determine the duty ratio of the PFC. The amount of integration is set to an integration desaturation point corresponding to a first preset value set by the duty cycle of the PFC. In a specific embodiment, the integral desaturation point may be a 0.8-fold integral clipping point.
In some embodiments, step S103 may include:
and if the duty ratio of the PFC is smaller than or equal to a first preset value and the time that the duty ratio of the PFC is smaller than the first preset value lasts for a first preset time, sending a first control instruction to the power supply circuit.
In the embodiment of the invention, in order to prevent frequent switching between the combined power supply of the direct-current power supply and the commercial power supply and the independent power supply of the commercial power supply caused by bus voltage fluctuation and/or cause error switching, the switching is carried out when the time that the duty ratio of the PFC is less than a first preset value lasts for a first preset time, namely, the bus voltage is stable. The method can improve the switching accuracy and has a positive effect on maintaining the service life of the direct-current power supply.
In some embodiments, when the dc power source is a battery, step S103 may further include:
and after the duty ratio of the PFC is judged to be less than or equal to a first preset value, controlling the PFC to charge the storage battery.
In the embodiment of the invention, after the duty ratio of the PFC is judged to be less than or equal to the first preset value, namely after the PFC is judged to be out of saturation, the commercial power not only has the independent power supply capacity, but also has redundant power, the PFC can be controlled to charge the storage battery, and the charging state or the discharging state of the charging and discharging circuit of the storage battery and the duty ratio of the charging and discharging state can be adjusted according to the duty ratio of the PFC.
In some embodiments, the control method may further include:
step S104: and if the duty ratio of the PFC is larger than a first preset value and smaller than a second preset value, acquiring the output current of the direct current power supply in real time.
Step S105: and determining whether the output current of the direct current power supply is smaller than a preset current.
Step S106: and if the output current of the direct current power supply is smaller than the preset current, sending a first control instruction to the power supply circuit.
In the embodiment of the invention, after the duty ratio of the PFC is obtained to be greater than the first preset value and less than the second preset value, a further comparison and judgment process can be carried out to further judge whether the commercial power does not have the independent power supply capability. When the obtained duty ratio of the PFC is larger than a first preset value and smaller than a second preset value, the output current of the direct current power supply can be immediately obtained in real time, and if the current is not small enough, the fact that the commercial power does not have independent power supply capacity can be confirmed; if the current is small enough, it indicates that the absolute value of the electric energy provided by the direct-current power supply is small enough, and at this time, the commercial power can also have the capability of independently supplying power to the load, or at this time, the electric quantity of the direct-current power supply is too low, and the commercial power needs to be switched to for independent power supply; when the PFC duty ratio is too close to 1, the problem of instability exists, so that an upper limit is set, and whether the PFC duty ratio is smaller than a second preset value or not is judged; the first preset value and the second preset value are smaller than 1, for example, the first preset value may be 0.8, and the second preset value may be 0.95. The method can reduce the false switching rate, prevent the situation that the power supply is still carried out when the electric quantity of the direct current power supply is too low, and prolong the service life.
In some embodiments, step S106 may include:
and if the output current of the direct current power supply is smaller than the preset current and the time that the output current of the direct current power supply is smaller than the preset current lasts for a second preset time, sending a first control instruction to the power supply circuit.
In the embodiment of the invention, in order to prevent frequent switching and/or error switching of the combined power supply of the direct current power supply and the commercial power supply and the single power supply caused by fluctuation of the output current of the direct current power supply, the switching is carried out when the time that the output current of the direct current power supply is less than the preset current lasts for the second preset time, namely the output current of the direct current power supply is stable. The method can further improve the switching accuracy and prolong the service life of the direct-current power supply.
In some embodiments, the control method may further include:
step S107: when the power supply circuit supplies power for the commercial power independently, the bus voltage of the power supply circuit is obtained in real time.
Step S108: determining whether the bus voltage is less than a first preset voltage.
Step S109: and if the bus voltage is less than the first preset voltage, sending a second control instruction to the power supply circuit.
The second control instruction is used for indicating the power supply circuit to be switched to a commercial power supply and a direct-current power supply to supply power simultaneously.
In the embodiment of the invention, the bus voltage is collected, when the bus voltage is lower than the first preset voltage, which indicates that the commercial power is abnormal at the moment, the commercial power and the direct-current power supply jointly supply power, so that the seamless switching between the independent power supply of the commercial power and the joint power supply of the commercial power supply and the direct-current power supply can be realized, the load is ensured not to be powered off, and the method is stable and reliable.
In some embodiments, step S109 may include:
and if the bus voltage is less than the first preset voltage and the time that the bus voltage is less than the first preset voltage lasts for a third preset time, sending the second control instruction to the power supply circuit.
In order to prevent misoperation caused by bus voltage fluctuation and/or frequent switching between independent power supply of mains supply and combined power supply of a direct-current power supply and the mains supply, when the bus voltage is lower than a first preset voltage for a preset time, a second control instruction is sent to a power supply circuit for switching. The method has positive effects on protecting the service life of the direct-current power supply and improving the switching accuracy.
In some embodiments, the rated bus voltage of the power supply circuit when the commercial power is supplied alone is a second preset voltage, and the rated bus voltage of the power supply circuit when the direct-current power supply is supplied alone is a third preset voltage;
the second preset voltage is greater than the third preset voltage.
Because the utility power supply cost is low, when the utility power and the direct current power supply jointly supply power, the rated bus voltage of the power supply circuit when the utility power is independently supplied is larger than the rated bus voltage of the direct current power supply when the utility power is independently supplied, so that the utility power is ensured to be supplied preferentially, the power supply cost is reduced, and the loss of the direct current power supply is reduced.
In some embodiments, the second preset voltage may be 385V and the third preset voltage may be 375V.
In some embodiments, the first preset voltage may be 345V.
In the embodiment of the present invention, for example, when the commercial power is supplied normally, the bus voltage is 385V; when the commercial power is abnormal, the bus voltage begins to drop, when the bus voltage drops to 345V, the direct-current power supply is started to supply power, and the rated output voltage of the direct-current power supply is 375V, the bus voltage is pulled up to 375V, so that the normal work of the power supply circuit is ensured, and the load is not powered off. If the voltage of the commercial power is low, the commercial power and the direct current power supply power simultaneously; if the mains supply is powered off, the direct current power supply supplies power independently.
The first preset voltage is larger than the minimum bus voltage without topping output by the inverter module in the power supply circuit, can be set according to actual conditions, and the value of the first preset voltage capable of meeting the requirement is within the protection range of the embodiment of the invention.
In some embodiments, the first preset time, the second preset time and the third preset time may be a value between 0.5ms and 1 ms.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Referring to fig. 3, an embodiment of the present invention further provides a control device applied to a power supply circuit, where the power supply circuit includes: the power supply circuit comprises a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the input end of an inverter through the bus; the output end of the inverter is used for connecting a load; the first power supply circuit is provided with a PFC; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC; the second power supply circuit transmits electric energy of a direct current power supply to the bus.
The control device includes:
the obtaining module 21 is configured to obtain the duty ratio of the PFC in real time when the power supply circuit simultaneously supplies power to the commercial power and the dc power supply.
A first determining module 22, configured to determine whether the duty cycle of the PFC is smaller than or equal to a first preset value.
The first control module 23 is configured to send a first control instruction to the power supply circuit if the duty ratio of the PFC is less than or equal to a first preset value; the first control instruction is used for indicating the power supply circuit to be switched to be supplied with the mains supply independently.
In some embodiments, when the dc power source is a battery, the first control module may be further configured to:
and after the duty ratio of the PFC is judged to be less than or equal to a first preset value, controlling the PFC to charge the storage battery.
In some embodiments, the obtaining the duty cycle of the PFC in real time may include: acquiring integral quantity in real time through integral control of PFC; calculating a duty cycle of the PFC based on the integral amount.
In some embodiments, the sending a first control instruction to the power supply circuit if the duty cycle of the PFC is less than or equal to a first preset value may include:
and if the duty ratio of the PFC is smaller than or equal to a first preset value and the time that the duty ratio of the PFC is smaller than the first preset value lasts for a first preset time, sending a first control instruction to the power supply circuit.
In some embodiments, the control device applied to the power supply circuit may further include:
and the direct current acquisition module is used for acquiring the output current of the direct current power supply in real time if the duty ratio of the PFC is greater than a first preset value and less than a second preset value.
And the second judgment module is used for determining whether the output current of the direct current power supply is smaller than the preset current.
And the second switching module is used for sending a first control instruction to the power supply circuit if the output current of the direct current power supply is smaller than the preset current.
In some embodiments, the sending a first control instruction to the power supply circuit if the output current of the dc power supply is smaller than the preset current may include:
and if the output current of the direct current power supply is smaller than the preset current and the time that the output current of the direct current power supply is smaller than the preset current lasts for a second preset time, sending a first control instruction to the power supply circuit.
In some embodiments, the control device applied to the power supply circuit may further include:
and the bus voltage acquisition module is used for acquiring the bus voltage of the power supply circuit in real time when the power supply circuit independently supplies power for the commercial power.
And the third judgment module is used for determining whether the bus voltage is less than the first preset voltage.
The third switching module is used for sending a second control instruction to the power supply circuit if the bus voltage is smaller than the first preset voltage; the second control instruction is used for indicating the power supply circuit to be switched to a commercial power supply and a direct-current power supply to supply power simultaneously.
In some embodiments, the sending a second control instruction to the power supply circuit if the bus voltage is less than the first preset voltage may include:
and if the bus voltage is less than the first preset voltage and the time that the bus voltage is less than the first preset voltage lasts for a third preset time, sending the second control instruction to the power supply circuit.
In some embodiments, the rated bus voltage of the power supply circuit when the commercial power is supplied alone is a second preset voltage, and the rated bus voltage of the power supply circuit when the direct-current power supply is supplied alone is a third preset voltage; the second preset voltage is greater than the third preset voltage.
In some embodiments, the second preset voltage may be 385V and the third preset voltage may be 375V.
In some embodiments, the first preset voltage is greater than the minimum bus voltage without topping output by the inverter module in the power supply circuit, and may be set according to actual conditions, and values of the first preset voltage that can meet requirements are within the protection scope of the embodiments of the present invention.
In some embodiments, the first preset voltage may be 345V.
In some embodiments, the first preset time, the second preset time and the third preset time may be a value between 0.5ms and 1 ms.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the control device is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 4 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 4, the terminal device 3 of this embodiment includes: one or more processors 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processors 30. The processor 30, when executing the computer program 32, implements the various steps described above in the various control method embodiments applied to the power supply circuit, such as steps S101 to S103 shown in fig. 2. Alternatively, the processor 30, when executing the computer program 32, implements the functionality of the various modules/units described above as applied to the control device embodiment of the power supply circuit, such as the functionality of the modules 21 to 23 shown in fig. 3.
Illustratively, the computer program 32 may be divided into one or more modules/units, which are stored in the memory 31 and executed by the processor 30 to accomplish the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 32 in the terminal device 3. For example, the computer program 32 may be divided into the acquisition module 21, the first determination module 22 and the first switching module 23.
The obtaining module 21 is configured to obtain the duty ratio of the PFC in real time when the power supply circuit simultaneously supplies power to the commercial power and the dc power supply.
A first determining module 22, configured to determine whether the duty cycle of the PFC is smaller than or equal to a first preset value.
The first control module 23 is configured to send a first control instruction to the power supply circuit if the duty ratio of the PFC is less than or equal to a first preset value; the first control instruction is used for indicating the power supply circuit to be switched to be supplied with the mains supply independently.
Other modules or units are not described in detail herein.
The terminal device 3 includes, but is not limited to, a processor 30 and a memory 31. It will be appreciated by those skilled in the art that fig. 4 is only one example of a terminal device and does not constitute a limitation to the terminal device 3, and may include more or fewer components than shown, or some components may be combined, or different components, e.g. the terminal device 3 may also include input devices, output devices, network access devices, buses, etc.
The Processor 30 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 31 may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory 31 may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory 31 may also include both an internal storage unit of the terminal device and an external storage device. The memory 31 is used for storing the computer program 32 and other programs and data required by the terminal device. The memory 31 may also be used to temporarily store data that has been output or is to be output.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed control device and control method applied to the power supply circuit may be implemented in other ways. For example, the above-described embodiments of the control device applied to the power supply circuit are merely illustrative, and for example, the division of a module or a unit is only one logical function division, and an actual implementation may have another division manner, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments described above may be implemented by a computer program, which is stored in a computer readable storage medium and used by a processor to implement the steps of the embodiments of the methods described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. A control method for a power supply circuit, the power supply circuit comprising: the power supply circuit comprises a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the input end of an inverter through the bus; the output end of the inverter is used for connecting a load; wherein the first power supply circuit is provided with a PFC; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC; the second power supply circuit transmits the electric energy of the direct current power supply to the bus;
the control method comprises the following steps:
when the power supply circuit supplies power to the commercial power and the direct-current power supply at the same time, the duty ratio of the PFC is obtained in real time;
determining whether the duty cycle of the PFC is less than or equal to a first preset value;
if the duty ratio of the PFC is smaller than or equal to a first preset value, a first control instruction is sent to the power supply circuit; the first control instruction is used for indicating the power supply circuit to be switched to the mains supply for independent power supply;
the obtaining the duty ratio of the PFC in real time includes:
acquiring integral quantity in real time through integral control of PFC;
calculating a duty cycle of the PFC based on the integral amount.
2. The method as claimed in claim 1, wherein the sending a first control command to the power supply circuit if the duty cycle of the PFC is less than or equal to a first preset value comprises:
and if the duty ratio of the PFC is smaller than or equal to a first preset value and the time that the duty ratio of the PFC is smaller than the first preset value lasts for a first preset time, sending a first control instruction to the power supply circuit.
3. The control method applied to the power supply circuit according to claim 1, wherein the control method further comprises:
if the duty ratio of the PFC is larger than a first preset value and smaller than a second preset value, acquiring the output current of the direct-current power supply in real time;
determining whether the output current of the direct current power supply is smaller than a preset current or not;
and if the output current of the direct current power supply is smaller than the preset current, sending a first control instruction to the power supply circuit.
4. The control method applied to the power supply circuit according to claim 3, wherein if the output current of the dc power supply is smaller than the preset current, sending a first control command to the power supply circuit comprises:
and if the output current of the direct current power supply is smaller than the preset current and the time that the output current of the direct current power supply is smaller than the preset current lasts for a second preset time, sending a first control instruction to the power supply circuit.
5. The control method applied to the power supply circuit according to any one of claims 1 to 4, wherein the control method further comprises:
when the power supply circuit supplies power for the mains supply independently, acquiring the bus voltage of the power supply circuit in real time;
determining whether the bus voltage is less than a first preset voltage;
if the bus voltage is smaller than the first preset voltage, sending a second control instruction to the power supply circuit;
the second control instruction is used for indicating the power supply circuit to switch to a commercial power supply and a direct-current power supply for supplying power simultaneously.
6. The control method applied to the power supply circuit according to claim 5, wherein if the bus voltage is less than the first preset voltage, sending a second control command to the power supply circuit comprises:
and if the bus voltage is less than the first preset voltage and the time that the bus voltage is less than the first preset voltage lasts for a third preset time, sending the second control instruction to the power supply circuit.
7. A control device for a power supply circuit, the power supply circuit comprising: the power supply circuit comprises a first power supply circuit, a second power supply circuit and a bus capacitor, wherein the first power supply circuit and the second power supply circuit are connected to a bus in parallel and connected with the input end of an inverter through the bus; the output end of the inverter is used for connecting a load; the first power supply circuit is provided with a PFC; the first power supply circuit transmits the electric energy of commercial power to the bus through the PFC; the second power supply circuit transmits the electric energy of the direct current power supply to the bus;
the control device includes:
the acquisition module is used for acquiring the duty ratio of the PFC in real time when the power supply circuit supplies power to the commercial power and the direct-current power supply simultaneously;
the first judgment module is used for determining whether the duty ratio of the PFC is smaller than or equal to a first preset value;
the first control module is used for sending a first control instruction to the power supply circuit if the duty ratio of the PFC is smaller than or equal to a first preset value; the first control instruction is used for indicating the power supply circuit to be switched to the mains supply for independent power supply;
the obtaining the duty ratio of the PFC in real time includes:
acquiring integral quantity in real time through integral control of PFC;
calculating a duty cycle of the PFC based on the integral amount.
8. A terminal device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, characterized in that said processor implements the steps of the control method applied to a power supply circuit according to any one of claims 1 to 6 when executing said computer program.
9. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the control method applied to a power supply circuit according to any one of claims 1 to 6.
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| CN202010844310.7A CN112039060B (en) | 2020-08-20 | 2020-08-20 | Control method and device applied to power supply circuit, terminal and storage medium |
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| CN101841188A (en) * | 2010-02-08 | 2010-09-22 | 哈尔滨工业大学 | Hybrid power supply uninterruptible inverted power supply of power feedback type optical network |
| CN106208885A (en) * | 2016-06-30 | 2016-12-07 | 广东美芝制冷设备有限公司 | Air-conditioner and the control system of micro-compressor and the control method of pfc circuit |
| CN110768368A (en) * | 2019-11-26 | 2020-02-07 | 国网电子商务有限公司 | Uninterruptible power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20200008277A1 (en) * | 2018-06-29 | 2020-01-02 | Markus Zeigler | Switchable stabilization load at low dimming levels |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841188A (en) * | 2010-02-08 | 2010-09-22 | 哈尔滨工业大学 | Hybrid power supply uninterruptible inverted power supply of power feedback type optical network |
| CN106208885A (en) * | 2016-06-30 | 2016-12-07 | 广东美芝制冷设备有限公司 | Air-conditioner and the control system of micro-compressor and the control method of pfc circuit |
| CN110768368A (en) * | 2019-11-26 | 2020-02-07 | 国网电子商务有限公司 | Uninterruptible power supply system |
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