CN111404121A - Power supply under-voltage protection method, system, medium and device - Google Patents
Power supply under-voltage protection method, system, medium and device Download PDFInfo
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- CN111404121A CN111404121A CN202010407136.XA CN202010407136A CN111404121A CN 111404121 A CN111404121 A CN 111404121A CN 202010407136 A CN202010407136 A CN 202010407136A CN 111404121 A CN111404121 A CN 111404121A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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Abstract
The invention provides a power supply under-voltage protection method, a system, a medium and a device, comprising the following steps: acquiring real-time voltage of a driver of the variable frequency compressor; when the real-time voltage is lower than the power-off protection value and the duration time is longer than or equal to the first holding time, entering a power-off monitoring state; when the real-time voltage is higher than the power-off protection recovery value and the duration time is longer than or equal to the second holding time, exiting the power-off monitoring state and entering a conventional undervoltage monitoring state; the duration time is less than the switching time, the power failure fault is not displayed, and the power failure fault is displayed when the duration time exceeds the switching time; when the normal undervoltage monitoring state is adopted, if the real-time voltage is lower than the undervoltage protection value and the duration time is longer than or equal to the third holding time, the alternating-current undervoltage fault state is entered; and exiting the AC undervoltage fault state until the real-time voltage is higher than the undervoltage protection recovery value and the duration time is longer than or equal to the fourth holding time. The invention is used for adapting to power failure or undervoltage caused by rapid switching between stations in a factory production and manufacturing automation system.
Description
Technical Field
The invention relates to the technical field of variable frequency compressor drivers, in particular to a power supply under-voltage protection method, system, medium and device.
Background
Currently, the reliability of an inverter compressor driver, which is a key component of an air conditioner, has a significant impact on the quality of the air conditioner. Ac power undervoltage protection is one important type of protection in variable frequency compressor drives. In daily use, when an alternating current power supply is under-voltage, a driver of the variable frequency compressor can timely protect and report faults. However, in a factory manufacturing automation system, if power is frequently switched between some stations, the power is still processed according to the method, and more production time is consumed because the failure is waited for to recover.
Therefore, the problem that the normal production is affected by the power supply outage or undervoltage caused by the rapid switching between the stations in the factory production is expected to be solved.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method, a system, a medium and a device for under-voltage protection of power supply, which are used to solve the problem in the prior art that how to adapt a variable frequency compressor driver to the normal production is affected by the power supply outage or under-voltage caused by the rapid switching between the stations in a factory manufacturing automation system.
In order to achieve the above and other related objects, the present invention provides a power source undervoltage protection method, which includes the following steps: acquiring real-time voltage of a driver of the variable frequency compressor; when the real-time voltage is lower than a power-off protection value and the duration time is longer than or equal to a first holding time, the inverter compressor driver enters a power-off monitoring state; until the real-time voltage is higher than a power-off protection recovery value and the duration time is longer than or equal to a second holding time, the variable-frequency compressor driver exits a power-off monitoring state and enters a conventional under-voltage monitoring state; wherein the power-off protection restoration value is greater than the power-off protection value; when the variable frequency compressor is in a conventional undervoltage monitoring state, if the real-time voltage is lower than an undervoltage protection value and the duration time is longer than or equal to a third holding time, the variable frequency compressor driver enters an alternating current undervoltage fault state; the variable frequency compressor driver exits the alternating current undervoltage fault state until the real-time voltage is higher than the undervoltage protection recovery value and the duration time is longer than or equal to a fourth holding time; wherein the undervoltage protection value is greater than the power-off protection recovery value, and the undervoltage protection recovery value is greater than the undervoltage protection value.
In an embodiment of the present invention, the inverter compressor driver includes: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit; the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver; when the real-time voltage is lower than the power-off protection value and the duration time is longer than or equal to the first holding time, the method for the inverter compressor driver to enter the power-off monitoring state comprises the following steps: and the control circuit closes the power factor correction circuit and the inverter circuit and displays no fault until the power failure monitoring state is entered and the switching time is exceeded, and displays the power failure fault.
In an embodiment of the present invention, the inverter compressor driver includes: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit; the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver; when in the normal under-voltage monitoring state, if the real-time voltage is lower than the under-voltage protection value and the duration time is longer than or equal to the third holding time, the entering of the variable frequency compressor driver into the alternating current under-voltage fault state comprises the following steps: the control circuit closes the power factor correction circuit and the inversion circuit and displays the alternating current undervoltage fault; the exiting of the AC undervoltage fault condition by the inverter compressor driver until the real-time voltage is greater than the undervoltage protection recovery value and the duration is greater than or equal to a fourth hold time comprises: and the control circuit clears the alternating-current undervoltage fault and recovers the power factor correction circuit and the inverter circuit.
In an embodiment of the present invention, the method further includes: when the control loop is powered off, the control loop is reset, and the power factor correction loop and the inverter loop are closed.
In order to achieve the above object, the present invention further provides an under-voltage power protection system, including: the system comprises an acquisition module, a power failure monitoring module and an under-voltage monitoring module; the acquisition module is used for acquiring the real-time voltage of the variable-frequency compressor driver; the power failure monitoring module is used for enabling the variable-frequency compressor driver to enter a power failure monitoring state when the real-time voltage is lower than a power failure protection value and the duration time is longer than or equal to a first holding time; until the real-time voltage is higher than a power-off protection recovery value and the duration time is longer than or equal to a second holding time, the variable-frequency compressor driver exits a power-off monitoring state and enters a conventional under-voltage monitoring state; wherein the power-off protection restoration value is greater than the power-off protection value; the under-voltage monitoring module is used for enabling the variable-frequency compressor driver to enter an alternating-current under-voltage fault state if the real-time voltage is lower than an under-voltage protection value and the duration time is longer than or equal to a third holding time in a conventional under-voltage monitoring state; the variable frequency compressor driver exits the alternating current undervoltage fault state until the real-time voltage is higher than the undervoltage protection recovery value and the duration time is longer than or equal to a fourth holding time; wherein the undervoltage protection value is greater than the power-off protection recovery value, and the undervoltage protection recovery value is greater than the undervoltage protection value.
In an embodiment of the present invention, the inverter compressor driver includes: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit; the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver; the power failure monitoring module is used for enabling the inverter compressor driver to enter a power failure monitoring state after the real-time voltage is lower than a power failure protection value and the duration time is longer than or equal to a first holding time, and the power failure monitoring module comprises: and the control circuit closes the power factor correction circuit and the inverter circuit and displays no fault until the power failure monitoring state is entered and the switching time is exceeded, and displays the power failure fault.
In an embodiment of the present invention, the inverter compressor driver includes: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit; the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver; the under-voltage monitoring module is used for when in the normal under-voltage monitoring state, if the real-time voltage is lower than the under-voltage protection value, and after the duration time is longer than or equal to the third holding time, the frequency conversion compressor driver enters the alternating current under-voltage fault state and comprises: the control circuit closes the power factor correction circuit and the inversion circuit and displays the alternating current undervoltage fault; the exiting of the AC undervoltage fault condition by the inverter compressor driver until the real-time voltage is greater than the undervoltage protection recovery value and the duration is greater than or equal to a fourth hold time comprises: and the control circuit clears the alternating-current undervoltage fault and recovers the power factor correction circuit and the inverter circuit.
In an embodiment of the invention, the under-voltage monitoring module is further configured to: when the control loop is powered off, the control loop is reset, and the power factor correction loop and the inverter loop are closed.
To achieve the above object, the present invention further provides a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements any of the above methods for under-voltage power protection.
In order to achieve the above object, the present invention further provides an under-voltage power protection device, including: a processor and a memory; the memory is used for storing a computer program; the processor is connected with the memory or the memory is contained in the processor and is used for executing the computer program stored by the memory so as to enable the power supply under-voltage protection device to execute any one of the power supply under-voltage protection methods.
As described above, the power under-voltage protection method, system, medium and apparatus of the present invention have the following advantages: can make the inverter compressor driver not only can adapt to the conventional under-voltage in the daily use, can also adapt to the power outage or the under-voltage that the station fast switch-over leads to among the factory production manufacturing automation system, according to the condition of difference, take suitable protection action automatically, report the trouble selectively for production need not wait for the protection to resume, improves production efficiency.
Drawings
FIG. 1a is a flow chart illustrating an under-voltage power protection method according to an embodiment of the present invention;
FIG. 1b is a block diagram of an exemplary embodiment of a inverter compressor driver according to the under-voltage protection method of the present invention;
FIG. 1c is a flowchart illustrating a power-down monitoring status of the under-voltage power protection method according to an embodiment of the present invention;
FIG. 1d is a flow chart showing a conventional under-voltage monitoring status of the under-voltage power protection method according to an embodiment of the present invention;
FIG. 1e is a flowchart illustrating an under-voltage power protection method according to another embodiment of the present invention;
FIG. 2 is a schematic diagram of an under-voltage power protection system according to an embodiment of the present invention;
FIG. 3a is a schematic structural diagram of an under-voltage power protection device according to an embodiment of the present invention;
fig. 3b is a schematic structural diagram of an under-voltage power protection device according to another embodiment of the invention.
Description of the element reference numerals
21 acquisition module
22 power-off monitoring module
23 under-voltage monitoring module
31 processor
32 memory
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, so that the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, the type, quantity and proportion of the components in actual implementation can be changed freely, and the layout of the components can be more complicated.
The power supply under-voltage protection method, the system, the medium and the device can ensure that the frequency conversion compressor driver not only can adapt to the conventional under-voltage in daily use, but also can adapt to the power supply outage or under-voltage caused by the rapid switching between stations in factory production, automatically takes proper protection action according to different conditions, selectively reports the fault, ensures that the production does not need to wait for protection recovery, and improves the production efficiency.
As shown in fig. 1a, in an embodiment, the under-voltage power protection method of the present invention includes the following steps:
and step S11, acquiring the real-time voltage of the variable-frequency compressor driver.
In particular, the inverter compressor driver, which is a key component of the air conditioner, has a significant influence on the quality of the air conditioner in terms of reliability. The inverter compressor is a compressor capable of continuously changing output energy by continuously adjusting the rotation speed of the compressor within a certain range through a control mode or means relative to the compressor with constant rotation speed. And the inverter compressor driver is suitable for controlling and driving the components of the inverter compressor. The real-time voltage refers to the size of the alternating current voltage currently provided for the variable frequency compressor driver.
Step S12, when the real-time voltage is lower than the power-off protection value and the duration time is more than or equal to the first holding time, the inverter compressor driver enters a power-off monitoring state; until the real-time voltage is higher than a power-off protection recovery value and the duration time is longer than or equal to a second holding time, the variable-frequency compressor driver exits a power-off monitoring state and enters a conventional under-voltage monitoring state; wherein the power-off protection restoration value is greater than the power-off protection value.
Specifically, when the real-time voltage is lower than a power-off protection value X11 and the duration time is greater than or equal to a first holding time X12, the inverter compressor driver enters a power-off monitoring state; until the real-time voltage is higher than a power failure protection recovery value X21 and the duration time is longer than or equal to a second holding time X22, the variable-frequency compressor driver exits a power failure monitoring state and enters a conventional under-voltage monitoring state; wherein the power-off protection recovery value X21 is greater than the power-off protection value X11.
Specifically, as shown in fig. 1b, the inverter compressor driver includes: the power factor correction circuit comprises an alternating current power supply loop, a power factor correction loop, an inverter loop and a control loop, wherein the control loop is respectively connected with the alternating current power supply loop, the power factor correction loop and the inverter loop, the alternating current power supply loop is connected with the power factor correction loop, and the power factor correction loop is connected with the inverter loop. The alternating current power supply loop is used for converting an alternating current power supply into a direct current power supply, comprises an alternating current relay and a current limiting resistor and can limit electrifying current. The power factor correction loop is connected with the alternating current power supply loop and used for receiving a direct current power supply provided by the alternating current power supply loop, converting the direct current power supply into stable bus voltage and adjusting the bus voltage. And the inverter circuit is connected with the power factor correction circuit and used for converting the bus voltage into line voltage to drive a load of a rear-stage compressor through duty ratio control of the inverter circuit. The control loop takes a main chip as a core, detects the voltage of the alternating current power supply loop, the current and the bus voltage of the power factor correction loop and the output current of the inverter loop, thereby completing the control and protection of each loop and displaying the running state. The main chip internally comprises the power supply under-voltage protection method.
As shown in fig. 1c, the control loop is used to obtain the real-time voltage of the inverter compressor driver; when the real-time voltage is lower than a power-off protection value X11 and the duration time is greater than or equal to a first holding time X12, the method for the inverter compressor driver to enter the power-off monitoring state comprises the following steps: when the real-time voltage is lower than a power failure protection value X11 and the duration time is more than or equal to a first holding time X12 and the switching time X13 is not exceeded, the control circuit closes the power factor correction circuit and the inverter circuit and displays no fault, and when the real-time voltage is lower than the power failure protection value X11 and enters a power failure monitoring state and exceeds the switching time X13, the power failure fault is displayed and refers to faults closely related to an alternating current power supply, such as alternating current undervoltage and direct current undervoltage, because the switching time X13 between target stations of a factory is exceeded, the current real-time voltage lower than the power failure protection value X11 is not caused by switching between the stations. The preset value of the power-off protection value X11 is 64V, the first keeping time X12 is smaller than the time required by power failure of the control circuit, the preset value is 1.2s, namely the control circuit enters a power-off monitoring state before power failure, and the switching time X13 is larger than the switching time between factory target stations and is 30 s. Therefore, even if the power supply of the driver of the variable-frequency compressor is powered off or is under-voltage due to rapid switching among stations in factory production, the fault cannot be displayed, and normal production is ensured.
Specifically, until the real-time voltage is higher than a power failure protection recovery value X21 and the duration time is longer than or equal to a second holding time X22, the variable frequency compressor driver exits the power failure monitoring state and enters a normal undervoltage monitoring state; wherein the power-off protection recovery value X21 is greater than the power-off protection value X11. The preset value of the power-off protection recovery value X21 is 120V, and the preset value of the second keeping time X22 is 1.2 s.
Step S13, when in the normal under-voltage monitoring state, if the real-time voltage is lower than the under-voltage protection value and the duration time is longer than or equal to the third holding time, the frequency conversion compressor driver enters the AC under-voltage fault state; the variable frequency compressor driver exits the alternating current undervoltage fault state until the real-time voltage is higher than the undervoltage protection recovery value and the duration time is longer than or equal to a fourth holding time; wherein the undervoltage protection value is greater than the power-off protection recovery value, and the undervoltage protection recovery value is greater than the undervoltage protection value.
Specifically, when in a normal undervoltage monitoring state, if the real-time voltage is lower than an undervoltage protection value Y11 and the duration time is greater than or equal to a third holding time Y12, the variable frequency compressor driver enters an alternating current undervoltage fault state; until the real-time voltage is higher than an under-voltage protection recovery value Y21 and the duration time is more than or equal to a fourth holding time Y22, the variable-frequency compressor driver exits the alternating-current under-voltage fault state; wherein the undervoltage protection value Y11 is greater than the power-off protection recovery value X21, and the undervoltage protection recovery value Y21 is greater than the undervoltage protection value Y11.
Specifically, the inverter compressor driver includes: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit; the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver. As shown in fig. 1d, when in the normal undervoltage monitoring state, if the protection condition "is not in the ac undervoltage fault state and the real-time voltage is lower than the undervoltage protection value Y11" is satisfied, the duration is further determined; when the duration is less than the third holding time Y12, no processing is performed; after the duration time is more than or equal to the third holding time Y12, the variable-frequency compressor driver enters an AC undervoltage fault state: and the control circuit closes the power factor correction circuit and the inverter circuit and displays the alternating current undervoltage fault. If the protection condition I is not met, namely the protection condition I is not in the AC undervoltage fault state, and the real-time voltage is lower than the undervoltage protection value Y11, the recovery condition I is judged to be in the AC undervoltage fault state, and the real-time voltage is higher than the undervoltage protection recovery value Y21. And if the recovery condition one is not met, no processing is carried out. If the recovery condition I is met, namely the AC undervoltage fault state is present and the real-time voltage is higher than the undervoltage protection recovery value Y21, further judging the duration time; when the duration is less than the fourth holding time Y22, no processing is performed; after the duration time is greater than or equal to the fourth holding time Y22, the exiting of the AC under-voltage fault state by the variable-frequency compressor driver comprises the following steps: and the control circuit clears the alternating-current undervoltage fault and recovers the power factor correction circuit and the inverter circuit. The undervoltage protection value Y11 is greater than a power-off protection recovery value X21, the undervoltage protection value Y11 is preset to 130V, the third retention time Y12 is preset to 2s, the undervoltage protection recovery value Y21 is greater than an undervoltage protection value Y11, and the undervoltage protection recovery value Y21 is preset to 140V. The preset value of the fourth holding time Y22 is 120 s. The protection function in daily use is not affected because the processing of the fault in the conventional undervoltage monitoring state is retained.
Specifically, the method further comprises the following steps: when the control loop is powered off, the control loop is reset, and the power factor correction loop and the inverter loop are closed.
Specifically, as shown in fig. 1e, a real-time voltage of the inverter compressor driver is obtained; and when the real-time voltage is lower than the power-off protection value X11 and the duration time is greater than or equal to the first holding time X12, the inverter compressor driver enters a power-off monitoring state. When the control loop is powered off, the control loop is reset, and the power factor correction loop and the inverter loop are closed. And after the real-time voltage is higher than the power-off protection recovery value X21 and the duration time is longer than or equal to a second holding time X22, the inverter compressor driver exits the power-off monitoring state. Can be applied to factory production and manufacturing automation systems. And in the stations needing to switch the power supply, if the switching time is short and the fault is not reported, the station can quickly enter the subsequent stations to continue production, so that the waiting time caused by fault recovery is saved, and the production efficiency is improved.
Specifically, the power-off protection value, the power-off protection recovery value, the undervoltage protection recovery value, the switching time, the first holding time, the second holding time, the third holding time, the fourth holding time, and the like, and initial values of the values and the time are predetermined according to station switching requirements in manufacturing. In actual production, the production manufacturing automation system can flexibly configure a power-off protection value, a power-off protection recovery value, an undervoltage protection recovery value, switching time, first holding time, second holding time, third holding time, fourth holding time and the like according to field conditions by issuing instructions/data.
As shown in fig. 2, in an embodiment of the invention, the system for undervoltage protection includes an obtaining module 21, a power-off monitoring module 22, and an undervoltage monitoring module 23.
The obtaining module 21 is configured to obtain a real-time voltage of the inverter compressor driver.
The power failure monitoring module 22 is used for entering a power failure monitoring state after the real-time voltage is lower than a power failure protection value X11 and the duration time is greater than or equal to a first holding time X12; until the real-time voltage is higher than a power failure protection recovery value X21 and the duration time is longer than or equal to a second holding time X22, the variable-frequency compressor driver exits a power failure monitoring state and enters a conventional under-voltage monitoring state; wherein the power-off protection recovery value X21 is greater than the power-off protection value X11.
The under-voltage monitoring module 23 is configured to, when in a normal under-voltage monitoring state, if the real-time voltage is lower than an under-voltage protection value Y11 and the duration is greater than or equal to a third holding time Y12, enter an ac under-voltage fault state by the inverter compressor driver; until the real-time voltage is higher than an under-voltage protection recovery value Y21 and the duration time is more than or equal to a fourth holding time Y22, the variable-frequency compressor driver exits the alternating-current under-voltage fault state; wherein the undervoltage protection value Y11 is greater than the power-off protection recovery value X21, and the undervoltage protection recovery value Y21 is greater than the undervoltage protection value Y11.
Specifically, the inverter compressor driver includes: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit; the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver; the power failure monitoring module is used for enabling the inverter compressor driver to enter a power failure monitoring state when the real-time voltage is lower than a power failure protection value X11 and the duration time is longer than or equal to a first holding time X12: the control loop closes the power factor correction loop and the inverter loop and shows no fault until a power outage monitoring state is entered beyond a switching time X13, showing a power outage fault.
Specifically, the inverter compressor driver includes: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit; the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver; the under-voltage monitoring module is used for enabling the variable-frequency compressor driver to enter an alternating-current under-voltage fault state after the real-time voltage is lower than an under-voltage protection value Y11 and the duration time is more than or equal to a third holding time Y12 when the variable-frequency compressor driver is in a normal under-voltage monitoring state: the control circuit closes the power factor correction circuit and the inversion circuit and displays the alternating current undervoltage fault; the exiting of the AC undervoltage fault condition by the inverter compressor drive until the real-time voltage is greater than the undervoltage protection recovery value Y21 and the duration is greater than or equal to a fourth hold time Y22 comprises: and the control circuit clears the alternating-current undervoltage fault and recovers the power factor correction circuit and the inverter circuit.
Specifically, the brown-out monitoring module is further configured to: when the control loop is powered off, the control loop is reset, and the power factor correction loop and the inverter loop are closed.
It should be noted that the structures and principles of the obtaining module 21, the power outage monitoring module 22, and the under-voltage monitoring module 23 correspond to the steps in the power supply under-voltage protection method one to one, and therefore, the description is omitted here.
It should be noted that the division of the modules of the above system is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the x module may be a processing element that is set up separately, or may be implemented by being integrated in a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and the function of the x module may be called and executed by a processing element of the apparatus. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Specific Integrated circuits (ASICs), or one or more Microprocessors (MPUs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when one of the above modules is implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
In an embodiment of the present invention, the present invention further includes a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements any of the methods for under-voltage power protection described above.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
As shown in fig. 3a, in an embodiment, the under-voltage power protection device of the present invention includes: a processor 31 and a memory 32; the memory 32 is for storing a computer program; the processor 31 is connected to the memory 32 and configured to execute a computer program stored in the memory 32, so that the under-voltage power protection apparatus executes any one of the under-voltage power protection methods.
Specifically, the memory 32 includes: various media that can store program codes, such as ROM, RAM, magnetic disk, U-disk, memory card, or optical disk.
Preferably, the Processor 31 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; the integrated Circuit may also be 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 device, or discrete hardware components.
As shown in fig. 3b, in an embodiment, the under-voltage power protection device of the present invention includes: a processor 31 and a memory 32; the memory 32 is for storing a computer program; the processor 31 includes the memory 32 therein, and is configured to execute a computer program stored in the memory 32, so that the under-voltage power protection apparatus executes any one of the under-voltage power protection methods.
In summary, the power supply under-voltage protection method, system, medium and device of the invention can make the variable frequency compressor driver not only adapt to the conventional under-voltage in daily use, but also adapt to the power outage or under-voltage caused by the rapid switching between stations in factory production, automatically take appropriate protection action according to different conditions, selectively report the fault, make the production not wait for the protection recovery, and improve the production efficiency. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The power supply under-voltage protection method is characterized by being applied to a variable frequency compressor driver and comprising the following steps of:
acquiring real-time voltage of a driver of the variable frequency compressor;
when the real-time voltage is lower than a power-off protection value and the duration time is longer than or equal to a first holding time, the inverter compressor driver enters a power-off monitoring state; until the real-time voltage is higher than a power-off protection recovery value and the duration time is longer than or equal to a second holding time, the variable-frequency compressor driver exits a power-off monitoring state and enters a conventional under-voltage monitoring state;
wherein the power-off protection restoration value is greater than the power-off protection value;
when the variable frequency compressor is in a conventional undervoltage monitoring state, if the real-time voltage is lower than an undervoltage protection value and the duration time is longer than or equal to a third holding time, the variable frequency compressor driver enters an alternating current undervoltage fault state; the variable frequency compressor driver exits the alternating current undervoltage fault state until the real-time voltage is higher than the undervoltage protection recovery value and the duration time is longer than or equal to a fourth holding time; wherein the undervoltage protection value is greater than the power-off protection recovery value, and the undervoltage protection recovery value is greater than the undervoltage protection value.
2. The undervoltage protection method of claim 1, wherein the inverter compressor driver comprises: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit;
the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver;
when the real-time voltage is lower than the power-off protection value and the duration time is longer than or equal to the first holding time, the method for the inverter compressor driver to enter the power-off monitoring state comprises the following steps: and the control circuit closes the power factor correction circuit and the inverter circuit and displays no fault until the power failure monitoring state is entered and the switching time is exceeded, and displays the power failure fault.
3. The undervoltage protection method of claim 1, wherein the inverter compressor driver comprises: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit;
the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver;
when in the normal under-voltage monitoring state, if the real-time voltage is lower than the under-voltage protection value and the duration time is longer than or equal to the third holding time, the entering of the variable-frequency compressor driver into the alternating-current under-voltage fault state comprises the following steps: the control circuit closes the power factor correction circuit and the inversion circuit and displays the alternating current undervoltage fault;
the exiting of the AC undervoltage fault condition by the inverter compressor driver until the real-time voltage is greater than the undervoltage protection recovery value and the duration is greater than or equal to a fourth hold time comprises: and the control circuit clears the alternating-current undervoltage fault and recovers the power factor correction circuit and the inverter circuit.
4. The undervoltage protection method according to claim 2 or 3, further comprising: when the control loop is powered off, the control loop is reset, and the power factor correction loop and the inverter loop are closed.
5. An undervoltage power protection system, comprising: the system comprises an acquisition module, a power failure monitoring module and an under-voltage monitoring module;
the acquisition module is used for acquiring the real-time voltage of the variable-frequency compressor driver;
the power failure monitoring module is used for enabling the variable-frequency compressor driver to enter a power failure monitoring state when the real-time voltage is lower than a power failure protection value and the duration time is longer than or equal to a first holding time; until the real-time voltage is higher than a power-off protection recovery value and the duration time is longer than or equal to a second holding time, the variable-frequency compressor driver exits a power-off monitoring state and enters a conventional under-voltage monitoring state; wherein the power-off protection restoration value is greater than the power-off protection value;
the under-voltage monitoring module is used for enabling the variable-frequency compressor driver to enter an alternating-current under-voltage fault state if the real-time voltage is lower than an under-voltage protection value and the duration time is longer than or equal to a third holding time in a conventional under-voltage monitoring state; the variable frequency compressor driver exits the alternating current undervoltage fault state until the real-time voltage is higher than the undervoltage protection recovery value and the duration time is longer than or equal to a fourth holding time; wherein the undervoltage protection value is greater than the power-off protection recovery value, and the undervoltage protection recovery value is greater than the undervoltage protection value.
6. An undervoltage power protection system according to claim 5, wherein said inverter compressor driver comprises: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit;
the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver;
the power failure monitoring module is used for enabling the inverter compressor driver to enter a power failure monitoring state after the real-time voltage is lower than a power failure protection value and the duration time is longer than or equal to a first holding time, and the power failure monitoring module comprises: and the control circuit closes the power factor correction circuit and the inverter circuit and displays no fault until the power failure monitoring state is entered and the switching time is exceeded, and displays the power failure fault.
7. An undervoltage power protection system according to claim 5, wherein said inverter compressor driver comprises: the control circuit is respectively connected with the alternating current power supply circuit, the power factor correction circuit and the inversion circuit, the alternating current power supply circuit is connected with the power factor correction circuit, and the power factor correction circuit is connected with the inversion circuit;
the control loop is used for acquiring the real-time voltage of the variable-frequency compressor driver;
the under-voltage monitoring module is used for when in the normal under-voltage monitoring state, if the real-time voltage is lower than the under-voltage protection value, and after the duration time is longer than or equal to the third holding time, the frequency conversion compressor driver enters the alternating current under-voltage fault state and comprises: the control circuit closes the power factor correction circuit and the inversion circuit and displays the alternating current undervoltage fault;
the exiting of the AC undervoltage fault condition by the inverter compressor driver until the real-time voltage is greater than the undervoltage protection recovery value and the duration is greater than or equal to a fourth hold time comprises: and the control circuit clears the alternating-current undervoltage fault and recovers the power factor correction circuit and the inverter circuit.
8. The undervoltage power protection system of claim 5, wherein the undervoltage monitoring module is further configured to: when the control loop is powered off, the control loop is reset, and the power factor correction loop and the inverter loop are closed.
9. A computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the under-voltage power protection method of any one of claims 1 to 4.
10. An undervoltage power protection device, comprising: a processor and a memory;
the memory is used for storing a computer program;
the processor is connected with the memory and used for executing the computer program stored in the memory so as to enable the undervoltage power protection device to execute the undervoltage power protection method of any one of claims 1 to 4.
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