CN117937918A - Voltage control method, device, household electrical appliance and storage medium - Google Patents
Voltage control method, device, household electrical appliance and storage medium Download PDFInfo
- Publication number
- CN117937918A CN117937918A CN202211307724.1A CN202211307724A CN117937918A CN 117937918 A CN117937918 A CN 117937918A CN 202211307724 A CN202211307724 A CN 202211307724A CN 117937918 A CN117937918 A CN 117937918A
- Authority
- CN
- China
- Prior art keywords
- load
- pfc circuit
- state
- controlling
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 68
- 230000007935 neutral effect Effects 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 230000009123 feedback regulation Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 79
- 239000003990 capacitor Substances 0.000 description 58
- 238000010586 diagram Methods 0.000 description 21
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- KLDZYURQCUYZBL-UHFFFAOYSA-N 2-[3-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound OC1=CC=CC=C1C=NCCCN=CC1=CC=CC=C1O KLDZYURQCUYZBL-UHFFFAOYSA-N 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 201000001098 delayed sleep phase syndrome Diseases 0.000 description 1
- 208000033921 delayed sleep phase type circadian rhythm sleep disease Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention mainly provides a voltage control method, a voltage control device, household electrical appliances and a computer storage medium. The method is applied to a PFC circuit, and comprises the following steps: determining an operating state of the first load and the second load; under the condition that the running states of the first load and the second load meet a preset first condition, the PFC circuit is enabled to output a first half bus voltage by controlling the working state of the PFC circuit to be in a first state; the first half bus voltage represents the supply voltage of the first load; the first state includes at least a state in which the controlled switch is closed.
Description
Technical Field
The present invention relates to a voltage control method, and more particularly, to a voltage control method, a voltage control device, a home appliance, and a computer storage medium.
Background
At present, a power factor correction (Power Factor Correction, PFC) technology is widely applied, a three-level three-phase active PFC circuit can be applied to an air conditioning system, loads in the air conditioning system mainly comprise a compressor load and a direct current fan load, in the related technology, for the aspect of the loads of the air conditioner, one mode is to supply power to a compressor driving part by full bus voltage, and supply power to a fan driving part after single-phase electric rectification is adopted by an alternating current side, in the control scheme, the problem of unbalanced three-phase current can be caused, and current harmonic waves are difficult to meet standards. In the control scheme, when the direct current fan operates independently, larger positive and negative deviations are generated on the output duty ratio, so that the control difficulty of the half bus capacitor voltage is higher, and the stability of a circuit is also poorer.
Disclosure of Invention
The invention provides a voltage control method, a voltage control device, household electrical appliances and a computer storage medium.
The embodiment of the invention provides a voltage control method which is applied to a Power Factor Correction (PFC) circuit, wherein the PFC circuit comprises an input power supply module, a controlled switch, a three-level converter, a first load and a second load; the input power supply module comprises three branches for providing three-phase current, the controlled switch is used for controlling the on-off of a power neutral point of the three-phase power supply and a midpoint of bus voltage, and the power supply voltage of the first load is half bus voltage of the direct current side of the three-level converter; the power supply voltage of the second load is the full bus voltage of the direct current side of the three-level converter; the method comprises the following steps:
determining an operating state of the first load and the second load;
Under the condition that the running states of the first load and the second load meet a preset first condition, the PFC circuit is enabled to output a first half bus voltage by controlling the working state of the PFC circuit to be in a first state; the first half bus voltage represents a supply voltage of the first load; the first state includes at least a state in which the controlled switch is closed.
In the above scheme, the method further comprises: under the condition that the second load stops running and the first load runs, determining that the running states of the first load and the second load meet a preset first condition; correspondingly, the step of controlling the working state of the PFC circuit to be in the first state to enable the PFC circuit to output the first half bus voltage comprises the following steps: and the PFC circuit outputs the first half bus voltage by controlling the controlled switch to be closed and controlling the working state of a switching device in the three-level converter.
It can be seen that when the first load is running and the second load is stopped, the PFC circuit can output the first half bus voltage by controlling the controlled switch to be closed and controlling the operating state of the three-level converter, so as to supply power to the first load and improve the load carrying capacity of the circuit.
In the above scheme, the controlling the working state of the switching device in the three-level converter includes: and controlling the switching devices in the three-level converter to be disconnected, or controlling the working states of the switching devices in the three-level converter according to the direction of each phase of current in the three-phase current.
It can be seen that the load requirements of the PFC circuit under different conditions can be satisfied by controlling different operating states of each switching device in the three-level converter.
In the above scheme, the method further comprises: determining that the operating states of the first load and the second load meet a preset first condition under the condition that the ratio of the operating power of the first load to the operating power of the second load is larger than a preset first threshold value; correspondingly, the step of controlling the working state of the PFC circuit to be in the first state to enable the PFC circuit to output the first half bus voltage comprises the following steps: and controlling the controlled switch to be closed, and carrying out feedback regulation on at least one of the three-phase current, the first half bus voltage and the full bus voltage so as to enable the PFC circuit to output the first half bus voltage.
It can be seen that when the ratio of the actual operating power of the first load to the actual operating power of the second load exceeds the preset threshold, the controlled switch is controlled to be closed, the ratio of the first half bus voltage to the full bus voltage can be improved by performing feedback adjustment on the first half bus voltage, so that the power supply capability of the first load can be improved, and the harmonic wave in the PFC circuit can be eliminated by performing feedback adjustment on the three-phase current.
In the scheme, the voltage value of the first half bus is not smaller than Sqrt (2) times of the effective value of the phase voltage.
It can be seen that the ratio of the first half bus voltage to the full bus voltage can be increased by performing feedback adjustment on the first half bus voltage, so that the power supply capability to the first load can be improved.
In the above scheme, the method further comprises: when the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value, the PFC circuit outputs full bus voltage by controlling the working state of the PFC circuit to be in a second state; the second state includes at least a state in which the controlled switch is open;
The method further comprises the steps of: when the working state of the PFC circuit is in a first state and the running states of the first load and the second load meet a preset second condition, the working state of the PFC circuit is controlled to be switched to the second state, so that the PFC circuit outputs full bus voltage; the second state includes at least a state in which the controlled switch is open; the second condition includes: and the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value.
It can be seen that by determining the working states of the first load and the second load, the working states of the PFC circuit can be controlled to be switched to the corresponding working states, so that the PFC circuit can supply power to the second load or supply power to both the first load and the second load, thereby meeting the power supply requirement of the PFC circuit.
In the above scheme, the controlling the switching of the working state of the PFC circuit to the second state includes: controlling the second load to start to operate, waiting for preset time, and controlling the controlled switch to be disconnected; or controlling the first load and the second load to stop running, controlling the controlled switch to be disconnected, and controlling the running states of the first load and the second load to meet the second condition.
It can be seen that when the working state of the PFC circuit is switched from the first state to the second state, by controlling the working states of the devices in the PFC circuit, the voltage across the controlled switch may not be increased sharply, so that the PFC circuit supplies power to the load stably.
In the above scheme, the method further comprises: when the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value, the PFC circuit outputs full bus voltage by controlling the working state of the PFC circuit to be in a second state; the second state includes at least a state in which the controlled switch is open;
The method further comprises the steps of: and when the working state of the PFC circuit is in a second state and the running states of the first load and the second load meet a preset first condition, controlling the working state of the PFC circuit to be switched to the first state, so that the PFC circuit outputs a first half bus voltage.
It can be seen that the working states of the first load and the second load can be determined, so that the working states of the PFC circuit can be controlled to be switched to corresponding working states, the PFC circuit can supply power to the first load, and the power supply requirement of the PFC circuit is met.
In the above scheme, the controlling the switching of the working state of the PFC circuit to the first state includes: controlling the first load and the second load to stop running, controlling the controlled switch to be closed, and controlling the running states of the first load and the second load to meet the first condition; or controlling the working state of the PFC circuit to enable the voltage of the first half bus output by the PFC circuit to be larger than a preset voltage value, and controlling the controlled switch to be closed; or controlling the first load and the second load to stop running, controlling the PFC circuit to be disconnected with an external power grid, controlling the controlled switch to be closed, controlling the PFC circuit to be connected with the external power grid, and controlling the running states of the first load and the second load to meet the first condition.
It can be seen that when the working state of the PFC circuit is switched from the first state to the second state, by controlling the working states of the devices in the PFC circuit, the voltage across the controlled switch may not be increased sharply, so that the PFC circuit supplies power to the load stably.
The embodiment of the invention also provides a voltage control device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes any one of the methods when executing the program.
The embodiment of the invention also provides the household electrical appliance, which comprises the voltage control device.
The embodiment of the invention also provides a computer storage medium, on which one or more programs are stored, the one or more programs being executable by one or more processors to implement any of the methods described above.
The embodiment of the invention provides a voltage control method, a device, household electrical appliances and a computer storage medium, wherein the method is applied to a Power Factor Correction (PFC) circuit, and the PFC circuit comprises an input power supply module, a controlled switch, a three-level converter, a first load and a second load; the input power supply module comprises three branches for providing three-phase current, the controlled switch is used for controlling the on-off of a power neutral point of the three-phase power supply and a midpoint of bus voltage, and the power supply voltage of the first load is half bus voltage of the direct current side of the three-level converter; the power supply voltage of the second load is the full bus voltage of the direct current side of the three-level converter; the method comprises the following steps: determining an operating state of the first load and the second load; under the condition that the running states of the first load and the second load meet a preset first condition, the PFC circuit is enabled to output a first half bus voltage by controlling the working state of the PFC circuit to be in a first state; the first half bus voltage represents a supply voltage of the first load; the first state includes at least a state in which the controlled switch is closed.
It can be seen that in the embodiment of the invention, a controlled switch is arranged in the PFC circuit, where the controlled switch is used to control the on-off of the three branches in the power supply voltage module and the midpoint of the bus voltage, and by controlling the working state of the PFC circuit, the charging mode of the capacitor in the PFC circuit can be regulated. By determining the operation states of the first load and the second load, when the operation states of the first load and the second load meet a preset first condition, the working state of the PFC circuit is controlled to be in the first state, wherein the first state at least comprises a state that a controlled switch is closed, the PFC circuit can output a first half bus voltage, and the first half bus voltage represents the power supply voltage of the first load, namely the half bus voltage corresponding to the first load can be effectively controlled, so that the normal operation of the load is guaranteed, the problem that the waveforms of the positive half side and the negative half side of an input current are unbalanced to a certain extent is solved, current harmonics can be improved, and the stability of the PFC circuit is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
Fig. 1 is a schematic topology diagram of a first three-phase active PFC circuit according to the related art;
fig. 2 is a schematic topology diagram of a second three-phase active PFC circuit according to the related art;
fig. 3 is a schematic flow chart of a voltage control method according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of a topology structure of a PFC circuit according to an embodiment of the present invention;
fig. 5A is a schematic diagram of a first structure of a controlled switch according to an embodiment of the present invention;
fig. 5B is a schematic diagram of a second structure of a controlled switch according to an embodiment of the present invention;
fig. 5C is a schematic diagram of a third structure of a controlled switch according to an embodiment of the present invention;
fig. 5D is a schematic diagram of a fourth configuration of a controlled switch according to an embodiment of the present invention;
fig. 6A is a schematic diagram of operation of a first PFC circuit according to an embodiment of the present invention;
Fig. 6B is a schematic diagram of a current flow of a PFC circuit according to an embodiment of the present invention;
Fig. 6C is a schematic diagram of a current flow of a PFC circuit according to a second embodiment of the present invention;
Fig. 7 is a schematic diagram of a second PFC circuit according to an embodiment of the present invention;
Fig. 8 is a schematic diagram of a third PFC circuit according to an embodiment of the present invention;
Fig. 9 is a schematic diagram of a fourth PFC circuit according to an embodiment of the present invention;
fig. 10 is a topology diagram of a PFC circuit for variable frequency air conditioner according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a voltage control device according to an embodiment of the present invention.
Detailed Description
In the related art, the three-phase active PFC circuit may be used for supplying power to a load of an air conditioner, where the load of the air conditioner is generally divided into a compressor load and a dc fan load, and the power supply to the load of the air conditioner is mainly implemented in two ways, and the first way is as shown in fig. 1, and the three-phase active PFC circuit includes an input power module 101, a first rectifying module 102, a second rectifying module 103, a first compressor load 104, and a first dc fan load 105, where three-phase voltage is rectified by the first rectifying module 102 and then outputs a high-voltage dc bus voltage, and the full bus voltage supplies power to the first compressor load 104, and the first dc fan load 105 is rectified by an ac side and then outputs a dc voltage to supply power.
In this manner, when the second dc fan load 204 is operated alone, only the lower bus capacitor needs to be supplied with power, but the three-phase active PFC circuit can charge the upper bus capacitor and the lower bus capacitor at the same time, so that the load carrying capacity of the lower bus capacitor is poor, and the upper bus capacitor is not charged and discharged only because the upper bus capacitor is not connected with the load, and when the upper bus capacitor voltage is too large, the three-phase active PFC circuit may cause disconnection of the three-phase active PFC circuit and poor power supply stability.
Therefore, the technical scheme of the embodiment of the invention is provided for solving the problems of high difficulty in controlling the half bus capacitor voltage and poor circuit stability in the related technology. Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. It is to be understood that the examples provided herein are for the purpose of illustration only and are not intended to limit the invention. In addition, the embodiments provided below are some of the embodiments for carrying out the present invention, but not all of the embodiments for carrying out the present invention, and the technical solutions described in the embodiments of the present invention may be implemented in any combination without conflict.
It should be noted that, in the embodiments of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a method or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such method or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other related elements in a method or apparatus comprising the element (e.g., a step in a method or an element in an apparatus, e.g., an element may be part of a circuit, part of a processor, part of a program or software, etc.).
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, may mean including any one or more elements selected from the group consisting of A, B and C.
For example, a voltage control method provided in the embodiment of the present invention includes a series of steps, but the voltage control method provided in the embodiment of the present invention is not limited to the described steps, and similarly, a voltage control apparatus provided in the embodiment of the present invention includes a series of modules, but the voltage control apparatus provided in the embodiment of the present invention is not limited to the modules explicitly described, and may also include modules that are required to be set for acquiring relevant information or performing processing based on the information.
Embodiments of the present invention may be implemented based on a Processor of a voltage control device, which may be part of a home appliance, where the Processor may be at least one of an Application Specific Integrated Circuit (ASIC), a digital signal Processor (DIGITAL SIGNAL Processor, DSP), a digital signal processing device (DIGITAL SIGNAL Processing Device, DSPD), a programmable logic device (Programmable Logic Device, PLD), a field programmable gate array (Field Programmable GATE ARRAY, FPGA), a central processing unit (Central Processing Unit, CPU), a controller, a microcontroller, and a microprocessor.
The embodiment of the invention provides a voltage control method which is applied to a Power Factor Correction (PFC) circuit, wherein the PFC circuit comprises an input power supply module, a controlled switch, a three-level converter, a first load and a second load; the input power supply module comprises three branches for providing three-phase current, the controlled switch is used for controlling the on-off of a power neutral point of the three-phase power supply and a midpoint of bus voltage, and the power supply voltage of the first load is half bus voltage of the direct current side of the three-level converter; the power supply voltage of the second load is the full bus voltage of the direct current side of the three-level converter. Fig. 3 is a schematic flow chart of a voltage control method according to an embodiment of the present invention, as shown in fig. 3, the flow may include:
step 301: an operating state of the first load and the second load is determined.
In the embodiment of the present invention, the topology structure of the PFC circuit is shown in fig. 4, fig. 4 is a schematic diagram of the topology structure of the PFC circuit in the embodiment of the present invention, and referring to fig. 4, the PFC circuit includes: an input power module 101, a controlled switch 402, a three-level converter 403, a first load 404, and a second load 405.
In the embodiment of the present invention, the input power module 101 is a three-phase ac power source, and is configured to input three-phase currents to the three-level converter 403, referring to fig. 4, the input power module 101 includes three branches for providing three-phase currents, where Va, vb and Vc respectively represent input voltages corresponding to three-phase ac currents in the three branches, ia, ib and ic respectively represent corresponding input three-phase currents, and three-phase ac currents represent three electrical signals with the same frequency, equal potential amplitude and 120 ° mutual phase difference.
In the embodiment of the invention, the controlled switch 402 is used for controlling the on-off of the neutral point of the three-phase power supply and the midpoint of the bus voltage. The controlled switch 402 may be a mechanical switch, such as a relay, or an electronic switch, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) device, a thyristor, or the like, which is not limited to the present invention.
Illustratively, as shown in fig. 5A, the controlled switch 402 is a relay; as shown in fig. 5B, the controlled switch 402 is a switching device combination composed of two MOSFETs; as shown in fig. 5C and 5D, the controlled switch 402 is a switching device combination composed of a MOSFET and a diode.
In the embodiment of the present invention, the three-level converter 403 is used to rectify the input three-phase currents ia, ib and ic through the three-level converter, referring to fig. 4, the three-level converter may include three power switch device combinations that are turned on in two directions, and the power switch devices in the power switch device combinations may be, for example, MOSFETs, or IGBTs, or MOS devices of silicon carbide (SiC) material or MOS devices of gallium nitride (GaN) material.
In an embodiment of the present invention, referring to fig. 4, the PFC circuit further includes: the first capacitor 406 and the second capacitor 407 are arranged on the direct current side of the three-level converter 403, the first capacitor 406 is an upper half bus capacitor, the voltage at two ends of the first capacitor 406 is an upper half bus voltage, the second capacitor 407 is a lower half bus capacitor, and the voltage at two ends of the second capacitor 407 is a lower half bus voltage.
In the embodiment of the present invention, the two half bus voltages on the dc side of the three-level converter 403 include an upper half bus voltage and a lower half bus voltage, and the voltages at two ends of the branch circuit formed by the first capacitor 406 and the second capacitor 407 are all bus voltages, which may also be simply referred to as bus voltages. The upper half bus voltage or the lower half bus voltage is illustratively half the bus voltage. It will be appreciated that the remaining unknown voltage values can be derived from any two known voltage values of the upper half bus voltage, the lower half bus voltage, and the bus voltage. The busbar voltage, the upper half busbar voltage, the lower half busbar voltage may be considered as the supply voltage to the load, and in some embodiments, the supply signal may be an ac supply signal of the mains.
Illustratively, the first capacitance 406 and the second capacitance 407 may be electrolytic capacitances or other types of capacitances.
In the embodiment of the present invention, the first load 404 may represent a load when the power supply voltage is the lower half bus voltage, the power supply voltage of the first load 404 represents the half bus voltage of the dc side of the three-level converter 403, and, for example, the first load 404 may be a dc fan in an air conditioner, and then the power supply voltage of the first load 404 is the lower half bus voltage of the dc side of the three-level converter 403.
In the embodiment of the present invention, the second load 405 may represent a load when the supply voltage is the full bus voltage, the supply voltage of the second load 405 represents the full bus voltage on the dc side of the three-level converter 403, and, for example, the second load 405 may be a compressor in an air conditioner, and then the supply voltage of the second load 405 is the full half bus voltage on the dc side of the three-level converter 403.
In some embodiments, the power factor correction PFC circuit further comprises: the first inductor 408, the second inductor 409 and the third inductor 410 are used for filtering high-frequency noise in the three-phase alternating current power supply, so that the input power supply is stable.
In the implementation of the present invention, the operation states of the first load 404 and the second load 405 include: the first load 404 operates independently, the second load 405 does not operate, and the first load 404 and the second load 407 operate simultaneously. Referring to fig. 4, when the operation states of the first load 404 and the second load 405 are that the first load 404 operates independently, and the second load 405 does not operate, the first load 404 is powered only by controlling to charge the second capacitor 406; when the operation state of the first load 404 is that the first load 404 and the second load 405 are simultaneously operated, it is necessary to control charging of the first capacitor 406 and the second capacitor 407 so as to realize power supply to the first load 404 and the second load 405.
Step 302: under the condition that the running states of the first load and the second load meet a preset first condition, the PFC circuit is enabled to output a first half bus voltage by controlling the working state of the PFC circuit to be in a first state; the first half bus voltage represents the supply voltage of the first load; the first state includes at least a state in which the controlled switch is closed.
In the embodiment of the present invention, when the operation states of the first load 404 and the second load 405 meet the preset first condition, the operation state of the PFC circuit is controlled to be in the first state, where the first state at least includes a state in which the controlled switch 402 is closed, so that the PFC circuit outputs a first half bus voltage, and the first half bus voltage represents the supply voltage of the first load 404.
In the embodiment of the present invention, referring to fig. 4, the supply voltage of the first load 404 is the first half bus voltage and the second half bus voltage, and the input power module 101 can charge the second capacitor 407 by controlling the controlled switch 402 to be closed, so that the second capacitor 407 can supply power to the first load 404.
It can be seen that in the embodiment of the present invention, the controlled switch 402 is disposed in the PFC circuit, where the controlled switch 402 controls the on/off of the three branches in the input power module 101 and the midpoint of the bus voltage. By determining the operation states of the first load 404 and the second load 405, when the operation states of the first load 404 and the second load 405 meet a preset first condition, that is, the first load 404 operates independently, the second load 407 does not operate, or when the ratio of the actual operation power of the first load 404 to the actual operation power of the second load 405 is larger, the operation state of the PFC circuit is controlled to be in the first state, so that the PFC circuit outputs a first half bus voltage to charge the second capacitor 407, and the second capacitor 407 supplies power to the first load 404, thereby effectively controlling the half bus voltage corresponding to the first load 404, being beneficial to ensuring the normal operation of the load, improving the load carrying capacity of the PFC circuit, and increasing the stability of the PFC circuit.
In some embodiments, the method further comprises:
under the condition that the second load stops running and the first load runs, determining that the running states of the first load and the second load meet a preset first condition;
Correspondingly, the step of controlling the working state of the PFC circuit to be in the first state to enable the PFC circuit to output the first half bus voltage comprises the following steps:
and the PFC circuit outputs the first half bus voltage by controlling the controlled switch to be closed and controlling the working state of a switching device in the three-level converter.
In some embodiments, when the operation states of the first load 404 and the second load 405 meet the preset first condition, it is indicated that the first load 404 is currently operated independently, and the second load 405 is not operated, that is, only charging the second capacitor 407 needs to be controlled to realize power supply to the first load 404, so that the load capacity of the circuit can be improved.
In some embodiments, when the controlled switch 402 is controlled to be closed, the working state of the PFC circuit is controlled to be in a first state, as shown in fig. 6A, fig. 6A is a schematic diagram of the working of the PFC circuit according to the first embodiment of the present invention, where a branch between a power neutral point of a three-phase power supply and a midpoint of a bus voltage is conducted, and a branch with a maximum phase voltage value of the three branches of the power supply module 101 is input, so that the first capacitor 406 may be charged.
In some embodiments, the three branches of the input power module 101 provide ac power, that is, the phase voltages corresponding to the three branches have positive voltage values in the positive half cycle and negative voltage values in the negative half cycle, so that the phase voltages have different current flows in the PFC circuits in the positive half cycle and the negative half cycle, and if the phase voltage corresponding to the branch with the input voltage Va is the maximum, the branch may charge the first capacitor 406 and/or the second capacitor 407, and when the phase voltage of the branch is in the positive half cycle, the current flows in the PFC circuit is as shown in fig. 6B, and the PFC circuit outputs the upper half bus voltage, that is, the first capacitor 406 may be charged; when the phase voltage of the branch is within the negative half cycle, the current in the PFC circuit flows as shown in fig. 6C, and the PFC circuit outputs the lower half bus voltage to charge the second capacitor 407. Since the capacitor has forward conduction, the second capacitor 407 is turned on only when the voltage of the positive electrode of the second capacitor 407 is higher than the voltage of the negative electrode, and thus the phase voltage is required to be higher than the lower half bus voltage, and the second capacitor 407 can be turned on.
In some embodiments, when the first load 404 operates independently and the second load 405 does not operate, the power supply to the first load 404 can be achieved only by controlling the charging of the second capacitor 407, so that the phase voltage of the branch with the largest phase voltage value can be controlled to be negative, so that the phase voltage of the branch is always kept within the negative half cycle, and then the PFC circuit outputs the first half bus voltage, that is, the second capacitor 407 can be charged, thereby achieving the power supply to the first load 404.
In some embodiments, the working state of the switching device in the three-level converter 403 may be controlled according to the signal of the pulse width control unit, so as to enable the three-level converter 403 to output the first half bus voltage, where the PWM is used to generate a driving signal, the driving signal includes a high-level signal and a low-level signal, the switching device determines the working state according to the driving signal, and when the high-level signal is received, the switching device is in a conducting state; upon receiving the low level signal, the switching device is in an off state.
It can be seen that when the first load 404 is running and the second load 405 is stopped, only the second capacitor 407 is charged by controlling the controlled switch 402 to be closed and controlling the working state of the three-level converter 403, so as to supply power to the first load 404, and improve the load carrying capability of the circuit.
In some embodiments, the controlling the operating state of the switching device in the three-level converter includes:
and controlling the switching devices in the three-level converter to be disconnected, or controlling the working states of the switching devices in the three-level converter according to the direction of each phase of current in the three-phase current.
In some embodiments, when the first load 404 is independently operated and the second load 405 is not operated, the controlled switch 402 is controlled to be closed, and each switching device in the three-level converter 403 is controlled to be opened, at this time, the PFC circuit does not rectify the alternating current provided by the input power module 101, but directly charges the second capacitor 407, so as to supply power to the first load 404.
In some embodiments, when the first load 404 operates independently and the second load 405 does not operate, the controlled switch 402 is controlled to be closed, and the operating state of each switching device in the three-level converter 403 is controlled according to the direction of each phase current in the three-phase current, so that the PFC circuit can rectify the alternating current provided by the input power module 101 at this time, so that the direct current voltage output by the three-level converter 403 charges the second capacitor 407, and the first half-bus voltage can be raised to realize power supply to the first load 404.
It can be seen that the load requirements of the PFC circuit under different conditions can be satisfied by controlling different operating states of the respective switching devices in the three-level converter 403.
In some embodiments, the method further comprises:
Determining that the operating states of the first load and the second load meet a preset first condition under the condition that the ratio of the operating power of the first load to the operating power of the second load is larger than a preset first threshold value;
Correspondingly, the step of controlling the working state of the PFC circuit to be in the first state to enable the PFC circuit to output the first half bus voltage comprises the following steps:
and controlling the controlled switch to be closed, and carrying out feedback regulation on at least one of the three-phase current, the first half bus voltage and the full bus voltage so as to enable the PFC circuit to output the first half bus voltage.
In some embodiments, the first half bus voltage value is not less than Sqrt (2) times the phase voltage effective value.
In some embodiments, when the operating states of the first load 404 and the second load 405 meet the preset first condition, it is indicated that the ratio of the actual operating power of the first load 404 to the actual operating power of the second load 405 is larger, which is indicative of a larger operating load of the first load 404 and a smaller operating load of the second load 405. The ratio of the actual operating power of the first load 404 to the actual operating power of the second load 405 may reflect the operating state of the first load 404, where a higher ratio indicates a greater operating load of the first load 404 and a lesser operating load of the second load 405.
In some embodiments, the first threshold may be preset according to existing experience, where the first threshold is used to determine the operating state of the first load 404, and when the ratio of the actual operating power of the first load 404 to the actual operating power of the second load 405 exceeds the preset threshold, it indicates that the operating load of the first load 404 is larger, and the operating load of the second load 405 is smaller, that is, only the ratio of the first half bus voltage to the full bus voltage needs to be increased, so that the power supply capability of the first load 404 may be improved.
In some embodiments, when the ratio of the actual operating power of the first load 404 to the actual operating power of the second load 405 exceeds a preset first threshold, the controlled switch 402 is controlled to be turned on, and the working state of the PFC circuit is controlled to be in the first state, as shown in fig. 7, fig. 7 is a schematic diagram of the working of the PFC circuit for the second power factor correction provided in the embodiment of the present invention, and the branch with the largest phase voltage value among the three branches of the input power module 101 may charge the first capacitor 406 and the second capacitor 407, and the first load 404 and the second load 405 may supply power.
In some embodiments, when the controlled switch 402 is closed, the second capacitor 407 is powered by the input power module 101, and then the addition of the three phase voltages of the input power module 101 is not zero, at this time, the three branches of the input power module 101 generate common mode currents, which may cause the problem of unbalanced three phase currents, and it is difficult to meet the current harmonic wave meeting the regulation standard.
In some embodiments, an ac voltage corresponding to the three-phase ac, an ac current corresponding to the three-phase ac, and a first half bus voltage may be collected, and by calculating a duty ratio of a combination of three power switching devices in the three-level converter 403, the three-phase current may be feedback-adjusted, so that a waveform of the three-phase current satisfies a sine property, so that a harmonic wave in the PFC circuit may be eliminated; the first half bus voltage can be further feedback-regulated, and the first half bus voltage value is controlled to be not smaller than Sqrt (2) times of the effective value of the phase voltage, so that the ratio of the first half bus voltage to the full bus voltage can be improved, and the power supply capability of the first load 404 can be improved.
The phase voltage is the voltage between any phase line and neutral line of the three-phase alternating current, wherein the voltage and the direction of the alternating current are all changed with time. If the thermal effect of the dc power at a certain voltage of the ac power is equal, the voltage of the dc power is an effective value of the ac power voltage. Illustratively, the phase voltage effective value of the three-phase alternating current is 220V.
It can be seen that, when the ratio of the actual operating power of the first load 404 to the actual operating power of the second load 405 exceeds the preset threshold, the controlled switch 402 is controlled to be closed, and the ratio of the first half bus voltage to the full bus voltage can be increased by performing feedback adjustment on the first half bus voltage, so that the power supply capability of the first load 404 can be improved, and the harmonic wave in the PFC circuit can be eliminated by performing feedback adjustment on the three-phase current.
In some embodiments, the method further comprises:
When the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value, the PFC circuit outputs full bus voltage by controlling the working state of the PFC circuit to be in a second state; the second state includes at least a state in which the controlled switch is open;
the method further comprises the steps of:
When the working state of the PFC circuit is in a first state and the running states of the first load and the second load meet a preset second condition, the working state of the PFC circuit is controlled to be switched to the second state, so that the PFC circuit outputs full bus voltage; the second state includes at least a state in which the controlled switch is open;
The second condition includes: and the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value.
In some embodiments, when the first load 404 is stopped and the second load 405 is running, it is indicated that the first load 404 is not currently running, and the second load 405 is running independently, i.e. charging the first capacitor 406 and the second capacitor 407 needs to be controlled, so that power supply to the second load 405 can be achieved.
In some embodiments, in the case where the ratio of the operating power of the first load 404 to the operating power of the second load 405 is less than the preset second threshold, it is indicated that the ratio of the current actual operating power of the first load 404 to the actual operating power of the second load 405 is less, which is indicative of the operating load of the first load 404 being less and the operating load of the second load 405 being greater. The ratio of the actual operating power of the first load 404 to the actual operating power of the second load 405 may reflect the operating states of the first load 404 and the second load 405, and the smaller the ratio, the smaller the operating load of the first load 404 and the larger the operating load of the second load 405.
In some embodiments, the second threshold is used to determine the operating states of the first load 404 and the second load 405, when the ratio of the actual operating power of the first load 404 to the actual operating power of the second load 405 is less than the preset second threshold, which indicates that the operating load of the first load 404 is smaller, and the operating load of the second load 405 is greater, the first capacitor 406 and the second capacitor 407 need to be charged simultaneously, so that the power can be supplied to the first load 404 and the second load 405.
In some embodiments, when the first load 404 stops running and the second load 405 runs, the controlled switch 402 is controlled to be turned off, and the working state of the PFC circuit is controlled to be in the second state, as shown in fig. 8, fig. 8 is a schematic diagram of the third PFC circuit according to the embodiment of the present invention, and the high-voltage dc voltage obtained by rectifying the three-phase ac power by the three-level converter 403 is output to the first capacitor 406 and the second capacitor 407 which are connected in series up and down, so that the first capacitor 406 and the second capacitor 407 connected in series up and down form a full bus voltage, and the full bus voltage supplies power to the second load 405.
In some embodiments, when the ratio of the operating power of the first load 404 to the operating power of the second load 405 is smaller than a preset second threshold, the controlled switch 402 is controlled to be turned off, and the operating state of the PFC circuit is controlled to be in the second state, as shown in fig. 9, fig. 9 is a schematic diagram of the fourth power factor correction PFC circuit according to the embodiment of the present invention, and the three-phase alternating current is rectified by the three-level converter 403 and then output to the first capacitor 406 and the second capacitor 407 which are connected in series up and down, so that the first capacitor 406 and the second capacitor 407 connected in series up and down form a full bus voltage, the second capacitor 407 provides a lower half bus voltage, the full bus voltage supplies power to the second load 405, and the lower half bus voltage supplies power to the first load 404.
In some embodiments, an ac voltage corresponding to the three-phase ac, an ac current corresponding to the three-phase ac, and a first half bus voltage may be collected, and by calculating a duty ratio of a combination of three power switching devices in the three-level converter 403, the three-phase current may be feedback-adjusted, so that a waveform of the three-phase current satisfies a sine property, so that a harmonic wave in the PFC circuit may be eliminated; the full bus voltage can be fed back and regulated, the full bus voltage value is controlled to be not smaller than Sqrt (6) times of the phase voltage effective value, and under the condition that the output voltage is enough, the electric control loss and heating condition can be reduced.
In some embodiments, when the controlled switch 402 is turned off, the three phase voltages of the input power module 101 add to zero, at which time the three branches of the input power module 101 do not generate common mode current, which is advantageous for meeting current harmonics meeting regulatory standards.
In some embodiments, when the operating state of the PFC circuit is in the first state, the PFC circuit outputs the first half bus voltage, and may supply power to the first load 404, if the first load 404 stops operating and the second load 405 operates at this time, or the ratio of the operating power of the first load 404 to the operating power of the second load 405 is less than a preset second threshold, that is, the second load 405 needs to be supplied with power, or both the first load 404 and the second load 405 are supplied with power, so that the operating state of the PFC circuit may be controlled to switch from the first operating state to the second state, so that the PFC circuit outputs the full bus voltage, where the second state at least includes a state in which the controlled switch is turned off.
It can be seen that, by determining the working states of the first load 404 and the second load 405, the working states of the PFC circuit can be controlled to be switched to the corresponding working states, so that the PFC circuit can realize power supply of the second load 405, or power supply of both the first load 404 and the second load 405, thereby meeting the power supply requirement of the PFC circuit.
In some embodiments, the controlling the switching of the operation state of the PFC circuit to the second state includes:
Controlling the second load to start to operate, waiting for preset time, and controlling the controlled switch to be disconnected;
or controlling the first load and the second load to stop running, controlling the controlled switch to be disconnected, and controlling the running states of the first load and the second load to meet the second condition.
In some embodiments, when the operating state of the PFC circuit is the first operating state, the controlled switch 402 is in a closed state, and when the operating state of the PFC circuit is the second operating state, the controlled switch 402 is in an open state, so that the controlled switch 402 needs to be controlled to be switched from the first state to the second state, but the controlled switch 402 needs to be controlled to be switched from the closed state to the open state, and suddenly opened or closed, the voltage across the controlled switch 402 may be suddenly increased, so that an overvoltage occurs, and a bus in the PFC circuit is used for distributing electric energy, and if the overvoltage occurs in the PFC circuit, the bus distributes and transmits the overvoltage to a load, so that the PFC circuit is unstable, and components in the PFC circuit may be lost.
In some embodiments, in order to improve stability of the PFC circuit, to achieve stable power supply of the PFC circuit to the load, when the operating state of the PFC circuit is switched from the first state to the second state, the second load 405 may be directly controlled to start to operate, after waiting for a preset time, the voltage in the PFC circuit is already stable, and then the controlled switch 402 is controlled to be turned off, so that a voltage across the controlled switch 402 will not increase abruptly.
In some embodiments, when the operating state of the PFC circuit is switched from the first state to the second state, the first load 404 and the second load 405 may be controlled to stop operating, that is, the PFC circuit does not need to supply power to the first load 404 and the second load 405 at this time, and then the controlled switch 402 is controlled to be turned off, and after the controlled switch 402 is turned off, the operating states of the PFC circuit may be correspondingly controlled according to the operating requirements of the first load 404 and the second load 405, so that the operating states of the first load 404 and the second load 405 satisfy the second condition.
It can be seen that when the working state of the PFC circuit is switched from the first state to the second state, by controlling the working states of the devices in the PFC circuit, the voltage across the controlled switch 402 may not be increased sharply, so that the PFC circuit supplies power to the load stably.
In some embodiments, the method further comprises:
When the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value, the PFC circuit outputs full bus voltage by controlling the working state of the PFC circuit to be in a second state; the second state includes at least a state in which the controlled switch is open;
the method further comprises the steps of:
and when the working state of the PFC circuit is in a second state and the running states of the first load and the second load meet a preset first condition, controlling the working state of the PFC circuit to be switched to the first state, so that the PFC circuit outputs a first half bus voltage.
In some embodiments, when the operating state of the PFC circuit is in the second state, the PFC circuit outputs the full bus voltage, and may supply power to the first load 404 and the second load 405, if the first load 404 is operated and the second load 405 stops operating at this time, or the ratio of the operating power of the first load 404 to the operating power of the second load 405 is greater than a preset first threshold, that is, the first load 404 needs to be supplied with power, so that the operating state of the PFC circuit may be controlled to switch from the second operating state to the first state, so that the PFC circuit outputs the first half bus voltage, where the first state at least includes a state in which the controlled switch is closed.
It can be seen that, by determining the working states of the first load 404 and the second load 405, the working states of the PFC circuit can be controlled to be switched to the corresponding working states, so that the PFC circuit can realize power supply of the first load 404 and meet the power supply requirement of the PFC circuit.
In some embodiments, the controlling the switching of the operation state of the PFC circuit to the first state includes:
controlling the first load and the second load to stop running, controlling the controlled switch to be closed, and controlling the running states of the first load and the second load to meet the first condition;
Or controlling the working state of the PFC circuit to enable the voltage of the first half bus output by the PFC circuit to be larger than a preset voltage value, and controlling the controlled switch to be closed;
or controlling the first load and the second load to stop running, controlling the PFC circuit to be disconnected with an external power grid, controlling the controlled switch to be closed, controlling the PFC circuit to be connected with the external power grid, and controlling the running states of the first load and the second load to meet the first condition.
In some embodiments, in order to improve stability of the PFC circuit, to achieve smooth power supply of the PFC circuit to the load, when the working state of the PFC circuit is switched from the second state to the first state, the first load 404 and the second load 405 may be controlled to stop running, that is, the PFC circuit does not need to supply power to the first load 404 and the second load 405 at this time, then the controlled switch 402 is controlled to be closed, and after the controlled switch 402 is closed, the running states of the PFC circuit may be correspondingly controlled according to the working requirements of the first load 404 and the second load 405, so that the running states of the first load 404 and the second load 405 satisfy the first condition.
In some embodiments, the controlled switch 402 may be controlled to be turned on after the first half bus voltage output by the PFC circuit is greater than the preset voltage value, and since the first half bus voltage value is already greater before the controlled switch 402 is controlled to be turned on, the voltage transition generated after the controlled switch 402 is controlled to be turned on will not affect the first load 404 to control the controlled switch 402 to be turned on, so that the PFC circuit may supply power to the load stably.
In some embodiments, the first load 404 and the second load 405 may be controlled to stop operating, then a relay connected to the PFC circuit and the external power grid is opened, that is, the PFC circuit is stopped from being supplied with power, then the controlled switch 402 is controlled to be closed, after the controlled switch 402 is closed, the relay is controlled to be closed again, so that the external power grid supplies power to the PFC circuit again, and finally, according to the working requirements of the first load 404 and the second load 405, the operating states of the first load 404 and the second load 405 are correspondingly controlled, so that the operating states of the first load 404 and the second load 405 meet the first condition.
It can be seen that when the working state of the PFC circuit is switched from the first state to the second state, by controlling the working states of the devices in the PFC circuit, the voltage across the controlled switch 402 may not be increased sharply, so that the PFC circuit supplies power to the load stably.
Fig. 10 is a topology diagram of a PFC circuit for power factor correction applied to a variable frequency air conditioner according to an embodiment of the present invention, as shown in fig. 10, in the PFC circuit, a first load 404 is a dc fan of the air conditioner, a second load 407 is a compressor of the air conditioner, that is, the dc fan of the air conditioner is powered by a lower half bus, the compressor of the air conditioner is powered by a full bus, and when the first load 404 is required to operate alone, and the second load 405 is in a stop operation, or when a ratio of an operating power of the first load 404 to an operating power of the second load 405 is greater than a preset first threshold, an operating state of the PFC circuit is controlled to be in a first state, where the first state at least includes a state in which a controlled switch 402 is closed, so that the PFC circuit outputs a first half bus voltage to supply power to the first load 404.
In the embodiment of the present invention, as shown in fig. 10, when the ratio of the operating power of the first load 404 to the operating power of the second load 405 is smaller than a preset second threshold, the operating state of the PFC circuit is controlled to be in a second state, where the second state at least includes a state in which the controlled switch 402 is turned off, so that the PFC circuit outputs a first half bus voltage to supply power to the first load 404 and the second load 405.
In the embodiment of the present invention, as shown in fig. 10, when the first load 404 is required to operate independently and the second load 405 is in a stop operation state, and the operating power of the first load 404 is greater than the power limit value or the power supply voltage of the first load 404 is less than the voltage limit value, the operating state of the PFC circuit is controlled to be in a first state, where the first state at least includes a state in which the controlled switch 402 is closed, and the operating state of the switching device in the three-level converter 403 is controlled, so that the PFC circuit outputs the first half bus voltage to supply power to the first load 404.
The computer program instructions corresponding to one voltage control method in this embodiment may be stored on a storage medium such as an optical disc, a hard disc, or a usb disc, and when the computer program instructions corresponding to one voltage control method in the storage medium are read or executed by a control device, any one of the voltage control methods in the foregoing embodiments is implemented.
Based on the same technical concept as the foregoing embodiments, referring to fig. 11, which illustrates a voltage control apparatus 1100 provided by an embodiment of the present invention, may include: memory 1101 and processor 1102; wherein,
A memory 1101 for storing computer programs and data;
a processor 1102 for executing a computer program stored in a memory to implement any one of the voltage control methods of the previous embodiments.
In practical applications, the memory 1101 may be a volatile memory (RAM); or a non-volatile memory (non-volatile memory), such as ROM, flash memory (flash memory), hard disk (HARD DISK DRIVE, HDD) or Solid state disk (Solid-state-STATE DRIVE, SSD); or a combination of the above, and provides instructions and data to the processor 1102.
The embodiment of the invention also provides a household electrical appliance, which comprises the voltage control device 1100.
For example, the functions or modules included in the apparatus provided by the embodiments of the present invention may be used to perform the methods described in the foregoing method embodiments, and specific implementations thereof may refer to descriptions of the foregoing method embodiments, which are not repeated herein for brevity.
The foregoing description of various embodiments is intended to emphasize the differences between the various embodiments, and the same or similar features thereof may be referred to each other for brevity and will not be repeated herein
The methods disclosed in the method embodiments provided by the invention can be arbitrarily combined under the condition of no conflict to obtain a new method embodiment.
The features disclosed in the embodiments of the products provided by the invention can be combined arbitrarily under the condition of no conflict to obtain new embodiments of the products.
The features disclosed in the embodiments of the method or the device provided by the invention can be arbitrarily combined under the condition of no conflict to obtain a new embodiment of the method or the device.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of units is only one logical function division, and there may be other divisions in actual implementation, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described as separate units may or may not be physically separate, and units 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention may be integrated in one processing module, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
Those of ordinary skill in the art will appreciate that: all or part of the steps of implementing the above method embodiments may be implemented by hardware associated with program instructions, and the foregoing program may be stored in a computer readable storage medium, which when executed, performs steps including the above method embodiments.
The above description is not intended to limit the scope of the invention, but is intended to cover any modifications, equivalents, and improvements within the spirit and principles of the invention.
Claims (12)
1. A voltage control method, characterized by being applied to a power factor correction PFC circuit, the PFC circuit comprising an input power module, a controlled switch, a three-level converter, a first load, and a second load; the input power supply module comprises three branches for providing three-phase current, the controlled switch is used for controlling the on-off of a power neutral point of the three-phase power supply and a midpoint of bus voltage, and the power supply voltage of the first load is half bus voltage of the direct current side of the three-level converter; the power supply voltage of the second load is the full bus voltage of the direct current side of the three-level converter; the method comprises the following steps:
determining an operating state of the first load and the second load;
Under the condition that the running states of the first load and the second load meet a preset first condition, the PFC circuit is enabled to output a first half bus voltage by controlling the working state of the PFC circuit to be in a first state; the first half bus voltage represents a supply voltage of the first load; the first state includes at least a state in which the controlled switch is closed.
2. The method according to claim 1, wherein the method further comprises:
under the condition that the second load stops running and the first load runs, determining that the running states of the first load and the second load meet a preset first condition;
Correspondingly, the step of controlling the working state of the PFC circuit to be in the first state to enable the PFC circuit to output the first half bus voltage comprises the following steps:
and the PFC circuit outputs the first half bus voltage by controlling the controlled switch to be closed and controlling the working state of a switching device in the three-level converter.
3. The method of claim 2, wherein controlling the operating state of the switching devices in the three-level converter comprises:
and controlling the switching devices in the three-level converter to be disconnected, or controlling the working states of the switching devices in the three-level converter according to the direction of each phase of current in the three-phase current.
4. The method according to claim 1, wherein the method further comprises:
Determining that the operating states of the first load and the second load meet a preset first condition under the condition that the ratio of the operating power of the first load to the operating power of the second load is larger than a preset first threshold value;
Correspondingly, the step of controlling the working state of the PFC circuit to be in the first state to enable the PFC circuit to output the first half bus voltage comprises the following steps:
and controlling the controlled switch to be closed, and carrying out feedback regulation on at least one of the three-phase current, the first half bus voltage and the full bus voltage so as to enable the PFC circuit to output the first half bus voltage.
5. The method of claim 4, wherein the first half bus voltage value is not less than Sqrt (2) times the phase voltage effective value.
6. The method according to claim 1, wherein the method further comprises:
When the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value, the PFC circuit outputs full bus voltage by controlling the working state of the PFC circuit to be in a second state; the second state includes at least a state in which the controlled switch is open;
the method further comprises the steps of:
When the working state of the PFC circuit is in a first state and the running states of the first load and the second load meet a preset second condition, the working state of the PFC circuit is controlled to be switched to the second state, so that the PFC circuit outputs full bus voltage; the second state includes at least a state in which the controlled switch is open;
The second condition includes: and the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value.
7. The method of claim 6, wherein controlling the switching of the operating state of the PFC circuit to the second state comprises:
Controlling the second load to start to operate, waiting for preset time, and controlling the controlled switch to be disconnected;
or controlling the first load and the second load to stop running, controlling the controlled switch to be disconnected, and controlling the running states of the first load and the second load to meet the second condition.
8. The method according to claim 1, wherein the method further comprises:
When the first load stops running and the second load runs, or the ratio of the running power of the first load to the running power of the second load is smaller than a preset second threshold value, the PFC circuit outputs full bus voltage by controlling the working state of the PFC circuit to be in a second state; the second state includes at least a state in which the controlled switch is open;
the method further comprises the steps of:
and when the working state of the PFC circuit is in a second state and the running states of the first load and the second load meet a preset first condition, controlling the working state of the PFC circuit to be switched to the first state, so that the PFC circuit outputs a first half bus voltage.
9. The method of claim 8, wherein controlling the switching of the operating state of the PFC circuit to the first state comprises:
controlling the first load and the second load to stop running, controlling the controlled switch to be closed, and controlling the running states of the first load and the second load to meet the first condition;
Or controlling the working state of the PFC circuit to enable the voltage of the first half bus output by the PFC circuit to be larger than a preset voltage value, and controlling the controlled switch to be closed;
or controlling the first load and the second load to stop running, controlling the PFC circuit to be disconnected with an external power grid, controlling the controlled switch to be closed, controlling the PFC circuit to be connected with the external power grid, and controlling the running states of the first load and the second load to meet the first condition.
10. A voltage control apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1 to 9 when the program is executed.
11. An electric household appliance, characterized in that it comprises the voltage control device of claim 10.
12. A computer storage medium having stored thereon one or more programs executable by one or more processors to implement the method of any of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211307724.1A CN117937918A (en) | 2022-10-24 | 2022-10-24 | Voltage control method, device, household electrical appliance and storage medium |
| PCT/CN2023/099949 WO2024087652A1 (en) | 2022-10-24 | 2023-06-13 | Voltage control method and apparatus, household appliance, storage medium, and program |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211307724.1A CN117937918A (en) | 2022-10-24 | 2022-10-24 | Voltage control method, device, household electrical appliance and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117937918A true CN117937918A (en) | 2024-04-26 |
Family
ID=90749484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211307724.1A Pending CN117937918A (en) | 2022-10-24 | 2022-10-24 | Voltage control method, device, household electrical appliance and storage medium |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117937918A (en) |
| WO (1) | WO2024087652A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8687388B2 (en) * | 2012-01-31 | 2014-04-01 | Delta Electronics, Inc. | Three-phase soft-switched PFC rectifiers |
| CN107147101B (en) * | 2017-06-16 | 2023-08-25 | 山东大学 | Topological structure and system for realizing bipolar direct current bus voltage independent control |
| CN114337199B (en) * | 2020-09-30 | 2023-11-21 | 重庆美的制冷设备有限公司 | Drive control circuit, drive control method, circuit board and air conditioner |
| CN112737296B (en) * | 2021-02-23 | 2023-01-06 | 阳光电源股份有限公司 | AC/DC circuit and charging and discharging device |
| CN115117986A (en) * | 2022-06-29 | 2022-09-27 | 华为数字能源技术有限公司 | Charging module, method and charging equipment |
-
2022
- 2022-10-24 CN CN202211307724.1A patent/CN117937918A/en active Pending
-
2023
- 2023-06-13 WO PCT/CN2023/099949 patent/WO2024087652A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024087652A1 (en) | 2024-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10230298B2 (en) | Resistorless precharging | |
| CN102246404B (en) | Power conversion device | |
| Iman-Eini et al. | A modular strategy for control and voltage balancing of cascaded H-bridge rectifiers | |
| KR101457569B1 (en) | Rectifier circuit and motor driving device using the same | |
| CN107567680B (en) | Variable speed drive with active converter | |
| US9203323B2 (en) | Very high efficiency uninterruptible power supply | |
| CN109889073B (en) | Drive control circuit and household electrical appliance | |
| US20170201202A1 (en) | Direct ac power converter | |
| US11387670B2 (en) | Double conversion on line ups with pass through neutral employing single DC bus | |
| US7327587B2 (en) | System and method for power conversion | |
| KR20190115364A (en) | Single and three phase combined charger | |
| US11990830B2 (en) | Power conversion system and virtual DC voltage generator circuit | |
| JP2016208693A (en) | Power conversion device | |
| CN117937918A (en) | Voltage control method, device, household electrical appliance and storage medium | |
| CN112997396B (en) | Adapter device for bidirectional operation | |
| CN108011507B (en) | Soft power-on system, equipment and soft power-on method thereof | |
| WO2024108979A1 (en) | Voltage control method and apparatus, and household appliance, storage medium and program | |
| CN110957900A (en) | Clamping circuit for reducing overshoot in power converter | |
| KR20040094552A (en) | Energy Regenerative Multi-Function Electronic Load | |
| CN109842315B (en) | Drive control circuit and household electrical appliance | |
| Gaeid et al. | Digitally Controlled Bridgeless Totem-Pole Power Factor Corrector. | |
| US11031859B2 (en) | Device for stabilizing direct current (DC) distribution system | |
| CN211352072U (en) | Variable frequency air conditioner rectifying circuit and variable frequency air conditioner | |
| CN115940654A (en) | Power supply and computing equipment | |
| CN115242134A (en) | Motor control system, control method and motor system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |